Patent Publication Number: US-2023142141-A1

Title: Accessory device for a personal care system, and related methods

Description:
The present disclosure relates to a personal care system, devices thereof and related methods. The personal care system comprises a personal care appliance, such as an ostomy appliance or a wound dressing, a monitor device, and an accessory device. In particular, the present disclosure relates to operation of a monitor device and accessory device in scenarios where a connection is lost or degraded, including storing schemes of a monitor device for a personal care appliance. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of embodiments and are incorporated into and a part of this specification. The drawings illustrate embodiments and together with the description serve to explain principles of embodiments. Other embodiments and many of the intended advantages of embodiments will be readily appreciated as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding similar parts. 
         FIG.  1    illustrates an exemplary personal care system being an ostomy system, 
         FIG.  2    illustrates an exemplary monitor device according to the present disclosure, 
         FIG.  3    is a flow diagram of an example method of operating a monitor device for a personal care system according to the present disclosure, 
         FIG.  4    is a block diagram illustrating an exemplary accessory device according to the present disclosure, 
         FIG.  5    is a flow diagram of an example method of operating an accessory device for a personal care system according to the present disclosure, 
         FIG.  6    shows one or more exemplary user interfaces for communicating the first indication according to the present disclosure, 
         FIG.  7    shows one or more exemplary user interfaces for communicating the second indication according to the present disclosure, and 
         FIG.  8    illustrates an exemplary personal care system being a wound dressing system. 
     
    
    
     DETAILED DESCRIPTION 
     Various exemplary embodiments and details are described hereinafter, with reference to the figures when relevant. It should be noted that the figures may or may not be drawn to scale and that elements of similar structures or functions are represented by like reference numerals throughout the figures. It should also be noted that the figures are only intended to facilitate the description of the embodiments. They are not intended as an exhaustive description of the invention or as a limitation on the scope of the invention. In addition, an illustrated embodiment needs not have all the aspects or advantages shown. An aspect or an advantage described in conjunction with a particular embodiment is not necessarily limited to that embodiment and can be practiced in any other embodiments even if not so illustrated, or if not so explicitly described. 
     Throughout this disclosure, the words “stoma” and “ostomy” are used to denote a surgically created opening bypassing the intestines or urinary tract system of a person. The words are used interchangeably, and no differentiated meaning is intended. The same applies for any words or phrases derived from these, e.g. “stomal”, “ostomies” etc. Also, the solid and liquid wastes emanating from the stoma may be referred to as both stomal “output,” “waste(s),” and “fluids” interchangeably. A subject having undergone ostomy surgery may be referred to as “ostomist” or “ostomate”—moreover, also as “patient” or “user”. However, in some cases “user” may also relate or refer to a health care professional (HCP), such as a surgeon or an ostomy care nurse or others. In those cases, it will either be explicitly stated, or be implicit from the context that the “user” is not the “patient” him- or herself. 
     In the following, whenever referring to proximal side or surface of a layer, an element, a device or part of a device, the referral is to the skin-facing side or surface, when a user wears the ostomy appliance. Likewise, whenever referring to the distal side or surface of a layer, an element, a device or part of a device, the referral is to the side or surface facing away from the skin, when a user wears the ostomy appliance/wound dressing appliance. In other words, the proximal side or surface is the side or surface closest to the user, when the appliance is fitted on a user and the distal side is the opposite side or surface—the side or surface furthest away from the user in use. 
     The axial direction is defined as the direction of the stoma, when a user wears the appliance. Thus, the axial direction is generally perpendicular to the skin or abdominal surface of the user. 
     The radial direction is defined as perpendicular to the axial direction. In some sentences, the words “inner” and “outer” may be used. These qualifiers should generally be perceived with respect to the radial direction, such that a reference to an “outer” element means that the element is farther away from a centre portion of the ostomy appliance or wound dressing than an element referenced as “inner”. In addition, “innermost” should be interpreted as the portion of a component forming a centre of the component and/or being adjacent to the centre of the component. In analogy, “outermost” should be interpreted as a portion of a component forming an outer edge or outer contour of a component and/or being adjacent to that outer edge or outer contour. 
     The use of the word “substantially” as a qualifier to certain features or effects in this disclosure is intended to simply mean that any deviations are within tolerances that would normally be expected by the skilled person in the relevant field. 
     The use of the word “generally” as a qualifier to certain features or effects in this disclosure is intended to simply mean—for a structural feature: that a majority or major portion of such feature exhibits the characteristic in question, and—for a functional feature or an effect: that a majority of outcomes involving the characteristic provide the effect, but that exceptionally outcomes do no provide the effect. 
     The present disclosure relates to a personal care system and devices thereof, such as a personal care appliance, a electrode assembly, a monitor device, and optionally one or more accessory devices, such as a primary accessory device and/or a secondary accessory device. Further, methods related to the personal care system and devices thereof are disclosed. An accessory device (also referred to as an external device), such as the primary accessory device and/or the secondary accessory device, may be a mobile phone or other handheld device, such as a tablet computer. An accessory device, such as the primary accessory device and/or the secondary accessory device, may be a personal electronic device, e.g. a wearable, such as a watch or other wrist-worn electronic device. An accessory device may be a docking station. The docking station may be configured to electrically and/or mechanically couple the monitor device to the docking station. The docking station may be configured for charging the monitor device and/or configured for transferring data between the monitor device and the docking station. The personal care system may comprise a server device. The server device may be operated and/or controlled by the personal care appliance manufacturer and/or a service centre. 
     The present disclosure provides a personal care system and devices thereof, such as a personal care appliance, e.g. an ostomy appliance or a wound dressing, a monitor device, and optionally one or more accessory devices which either alone or together facilitate reliable determination and monitoring of the nature, severity and rapidness of moisture propagation in the personal appliance, such as in an adhesive material provided for attaching a base plate of an ostomy appliance to the skin surface of a user or in an absorbent core of the wound dressing. 
     The personal care system may be an ostomy system. Thus, the personal care appliance may be an ostomy appliance. 
     The personal care system may be a wound dressing system. Thus, the personal care appliance may be a wound dressing appliance also denoted wound dressing. A wound dressing system and devices thereof are provided, such as a wound dressing, a monitor device, and optionally one or more accessory devices which either alone or together facilitate reliable monitoring of the wound dressing and operating state thereof. Accordingly, the wound dressing system and devices thereof enable providing information to the user about the operating state of the wound dressing, and in turn optionally enable providing an indication to the user or a caretaker of the remaining time frame for replacing the wound dressing without experiencing leakage and/or to provide optimum wound healing conditions. 
     The personal care system may be a catheter system. Thus, the personal care appliance may be a catheter appliance. 
     The personal care system comprises one or more of a personal care appliance, a monitor device, and one or more accessory devices as described herein. 
     Depending on the nature of the pattern of moisture propagation in the personal care appliance, the personal care system and devices thereof enable providing information to the user about the status and/or a type of failure, and in turn enable providing an indication to the user of the severity and thus the remaining time frame for replacing the personal care appliance without experiencing severe leakage and/or skin damage and/or to improve wound healing. 
     In particular, the present disclosure ensures or facilitates that essential data related to the monitoring of the personal care appliance are not lost or at least maintained in the personal care system during connection loss. Further, the present disclosure provides that information to the user about the status and/or a type of failure in the personal care appliance is provided even in case of connection loss in the system. The present disclosure allows higher flexibility to a user, e.g. in scenarios where the user does not have access to the primary accessory device, e.g. during work-out, shopping, work, etc. 
     It is as important aspect of the present disclosure that a personal care system with redundancy in accessory device functionality is provided. 
     The ostomy appliance comprises a base plate and an ostomy pouch (also referred to as an ostomy bag). The ostomy appliance may be a colostomy appliance, an ileostomy appliance or a urostomy appliance. The ostomy appliance may be a two-part ostomy appliance, i.e. the base plate and the ostomy pouch may be releasably coupled e.g. with a mechanical and/or an adhesive coupling, e.g. to allow that a plurality of ostomy pouches can be utilized (exchanged) with one base plate. Further, a two-part ostomy appliance may facilitate correct application of the base plate to skin, e.g. to an improved user sight of the stomal region. The ostomy appliance may be a one-part ostomy appliance, i.e. the base plate and the ostomy pouch may be fixedly attached to each other. The base plate is configured for coupling to a user&#39;s stoma and/or skin surrounding the stoma, such as a peristomal skin area. The ostomy appliance may comprise an electrode assembly or the ostomy system optionally comprises an electrode assembly mountable on a proximal side of the base plate of the ostomy appliance. The electrode assembly, also denoted sensor assembly or sensor patch, comprises a plurality of electrodes optionally arranged on a distal side of a first adhesive layer of the ostomy appliance or on a distal side of a first adhesive layer of the electrode assembly, the plurality of electrodes forming a plurality of sensors (electrode pairs). The ostomy appliance/electrode assembly may comprise a monitor interface for connecting electrodes of the electrode assembly to terminals of the first interface of the monitor device. 
     The wound dressing appliance comprises a top layer, a first adhesive layer with a proximal surface configured for attachment of the wound dressing to the skin surface of a user; an absorbent core layer; and an electrode assembly comprising a plurality of electrodes optionally arranged on a distal side of the absorbent core layer, the plurality of electrodes forming a plurality of sensors (electrode pairs). The top layer is optionally on a distal side of the electrode assembly. The wound dressing may comprise a monitor interface for connecting electrodes of the electrode assembly to terminals of the first interface of the monitor device. 
     A monitor device for a personal care system comprising a personal care appliance, the monitor device, and one or more accessory devices is disclosed, the monitor device comprising a processor; a memory connected to the processor; a first interface connected to the processor, the first interface configured for connecting the monitor device to the personal care appliance; and a second interface comprising a transceiver module connected to the processor and configured for connecting the monitor device to the one or more accessory devices of the personal care system. The monitor device is configured to establish a connection between the monitor device and at least one of the one or more accessory devices; determine whether a primary storing criterion, e.g. based on a quality of the connection, is satisfied; and in accordance with a determination that the primary storing criterion is satisfied, store primary monitor data in the memory according to a primary storing scheme. 
     A storing scheme optionally defines one or more storing parameters, such as a storing frequency and/or a data size of monitor data stored in a storing operation, for storing monitor data in the memory. A storing scheme optionally defines one or more parts of monitor data to be stored in accordance with the storing scheme. The primary storing scheme may define a primary storing frequency for storing monitor data in the memory according to the primary storing scheme. The primary storing scheme may define a primary data size of monitor data stored in a storing operation in the memory according to the primary storing scheme. 
     The monitor data may comprise appliance data (also denoted a first part of monitor data) optionally indicative of a physical condition of the personal care appliance. The appliance data may be ostomy data indicative of a physical condition of the ostomy appliance, such as a physical condition of a base plate of the ostomy appliance and/or an electrode assembly. The appliance data may be wound dressing data indicative of a physical condition of the wound dressing appliance, such as a physical condition of an absorbent core layer of the wound dressing appliance. The primary monitor data may comprise primary appliance data and/or the secondary monitor data may comprise secondary appliance data. The primary appliance data may be different from the secondary monitor data. 
     The appliance data, such as the primary appliance data and/or the secondary appliance data, may comprise first appliance sensor data obtained from or derived from a first sensor (e.g. a first electrode pair) of the personal care appliance. The first sensor may be an outer or outermost sensor of an ostomy appliance/electrode assembly. The first sensor may be a sensor arranged at or near a periphery of an absorbent core of a wound dressing appliance. The appliance data, such as the primary appliance data and/or the secondary appliance data, may comprise second appliance sensor data obtained from or derived from a second sensor (e.g. a second electrode pair) of the personal care appliance. The second sensor may be an inner or innermost sensor of an ostomy appliance/electrode assembly. The second sensor may be a sensor centrally located on an absorbent core of a wound dressing appliance. The appliance data, such as the primary appliance data and/or the secondary appliance data, may comprise third appliance sensor data obtained from or derived from a third sensor (e.g. a third electrode pair) of the personal care appliance. The third sensor may be an inner or innermost sensor of an ostomy appliance/electrode assembly. The appliance data, such as the primary appliance data and/or the secondary appliance data, may comprise fourth appliance sensor data obtained from or derived from a fourth sensor (e.g. a fourth electrode pair) of the personal care appliance. The fourth sensor may be an inner or innermost sensor of an ostomy appliance/electrode assembly. The appliance data, such as the primary appliance data and/or the secondary appliance data, may comprise fifth appliance sensor data obtained from or derived from a fifth sensor (e.g. a fifth electrode pair) of the personal care appliance. The fifth sensor may be a sensor of an ostomy appliance/electrode assembly arranged between an inner sensor and an outermost sensor. 
     In one or more exemplary monitor devices, the primary storing criterion based on a quality of the connection is satisfied when it is determined that the quality of the connection is below a threshold. The primary storing criterion being satisfied may indicate that the connection is lost or that the connection has a low quality or does not have a satisfactory quality to transmit monitor data to the accessory device. In other words, the monitor device is optionally configured to store the monitor data in the memory upon determination of no or low-quality connection to the accessory device. For example, the primary storing criterion, also denoted SC_ 1 , may be based on a primary connection parameter, CP_ 1 , associated with the connection and being indicative of a quality of the connection. 
     The primary storing criterion SC_ 1  may be given as: 
       SC_1:CP_1&lt;TH_S_1, 
     wherein CP_ 1  is the primary connection parameter and TH_S_ 1  is a primary storing threshold. The primary connection parameter CP_ 1  may be a signal strength indicator, such as a received signal strength indicator (RSSI) or a received channel power indicator (RCPI). The primary connection parameter CP_ 1  may be a signal-to-noise ratio. 
     The primary storing criterion SC_ 1  may be given as: 
       SC_1:CP_1&gt;TH_S_1, 
     wherein CP_ 1  is the primary connection parameter indicative of errors in the connection (large number of errors indicating no or poor connection), such as an error rate (such as a bit error rate or a frame error rate), a number of non-acknowledgements (NACKs), and/or a number of retransmissions, and TH_S_ 1  is a primary storing threshold. 
     In one or more exemplary monitor devices, to determine whether a primary storing criterion, e.g. based on a quality of the connection, is satisfied may comprise to determine or obtain a primary connection parameter, CP_ 1 , based on one or more connection parameters, and to compare the primary connection parameter with a primary storing threshold TH_S_ 1 . 
     The primary connection parameter may be based on one or more connection parameters, such as signal-to-noise ratio, an error rate (such as a bit error rate, and/or a frame error rate), a number of non-acknowledgements (NACKs), and/or a number of retransmissions. In one or more exemplary monitor devices, in accordance with a determination that the primary storing criterion is satisfied, the monitor device does not transmit monitor data any longer or forgo to transmit monitor data to the accessory device. In other words, the monitor device may be configured to determine whether the connection to the accessory device is lost by determining whether the primary storing criterion based on the quality of the connection is satisfied. Stated differently, the primary storing criterion based on a quality of the connection is satisfied when it is determined that the quality of the connection is degraded (e.g. poor) and/or reduced, leading to a loss of connection to the accessory device. Thus, the monitor device is configured to store monitor data in the memory in case the connection to the accessory device is of low quality, e.g. lost or degraded. 
     The monitor device may be configured to, in accordance with a determination that the primary storing criterion is satisfied, determine the primary storing scheme. 
     In one or more exemplary monitor devices, the monitor device is configured to, in accordance with a determination that the primary storing criterion is satisfied, select or determine the primary storing scheme from a plurality of storing schemes. The plurality of storing schemes may comprise two, three, four, or more storing schemes, such as at least five storing schemes. The plurality of storing schemes comprises a first storing scheme and a second storing scheme. 
     In one or more exemplary monitor devices, the monitor device is configured to transmit monitor data to the accessory device, wherein to transmit monitor data to the accessory device comprises to store monitor data in the memory according to a transmit storing scheme, e.g. as a part of buffering the monitor data (real-time monitor data) to be transmitted. The primary storing scheme is different from the transmit storing scheme. The primary storing scheme may have a primary storing frequency smaller than a transmit storing frequency of the transmit storing scheme and/or the primary storing scheme may have a first data size larger than a transmit data size of the transmit storing scheme. 
     The monitor data transmitted to the accessory device may comprise appliance data that are not stored in the memory according to the primary storing scheme and/or a secondary storing scheme. For example, appliance sensor data obtained from or derived from one or more appliance sensors being part of monitor data transmitted to the accessory device may not be stored in the memory according to the primary storing scheme and/or secondary storing scheme. Accordingly, the primary monitor data may be a reduced data set compared to the real-time monitor data that are transmitted to the accessory device during normal connection and optionally stored according to the transmit storing scheme. Thereby, optimum or improved usage of the limited memory capacity in the monitor device is provided. 
     The primary monitor data may comprise compressed appliance sensor data, such as compressed appliance sensor data for one or more sensors that are not regarded as critical, such as an inner sensor of an ostomy appliance or wound dressing. Appliance sensor data for one or more sensors that are not regarded as critical may be omitted in the primary monitor data. The primary monitor data may comprise monitor data different from the monitor data transmitted when the connection is ok/satisfactory (also denoted real-time monitor data). For example, the real-time monitor data may comprise appliance sensor data, such as one or more of second appliance sensor data, third appliance sensor data, fourth appliance sensor data, and fifth appliance sensor, that are not included in the primary monitor data. Optionally, the primary monitor data may comprise appliance sensor data that are not included in the real-time monitor data. For example, the processor of the monitor device may be configured to determine one or more parameters based on the appliance data and include the parameters in the primary monitor data in accordance with a determination that the first storing criterion is satisfied. 
     In one or more exemplary monitor devices, to store primary monitor data may comprise compressing and/or deleting monitor data stored in accordance with the transmit storing scheme. 
     In one or more exemplary monitor devices, to select the primary storing scheme is based on a first parameter indicative of time since a quality of the connection is less than a threshold. In one or more exemplary monitor devices, to select the primary storing scheme is based on a first parameter indicative of time since a determination that the primary storing scheme was satisfied. In one or more exemplary monitor devices, to select the primary storing scheme comprises to select a first storing scheme as the primary storing scheme if the first parameter indicative of time since a determination that the primary storing scheme was satisfied is indicative of a small time, e.g. if the first parameter is less than a first time threshold, and/or to select a second storing scheme as the primary storing scheme if the first parameter indicative of time since a determination that the primary storing scheme was satisfied is indicative of a long time, e.g. if the first parameter is larger than a second time threshold. The first time threshold may be different from the second time threshold. 
     In one or more exemplary monitor devices, to select the primary storing scheme is based on a second parameter indicative of available memory capacity of the memory. In one or more exemplary monitor devices, to select the primary storing scheme comprises to select a first storing scheme as the primary storing scheme if the second parameter indicative of available memory capacity is indicative of a large memory capacity, e.g. if the second parameter is larger than a first memory threshold, and/or to select a second storing scheme as the primary storing scheme if the second parameter indicative of available memory capacity is indicative of a small or reduced memory capacity, e.g. if the second parameter is less than a second memory threshold. 
     In one or more exemplary monitor devices, to select the primary storing scheme is based on both the first parameter and the second parameter. Thereby improved storing of monitor data may be provided. 
     In one or more exemplary monitor devices, to select the primary storing scheme is based on an operating state of the personal care appliance. For example, a first operating state of the personal care appliance, e.g. requiring high attention, may trigger selection of a first storing scheme as the primary storing scheme, while a second operating state, e.g. requiring no or little attention, may trigger selection of a second storing scheme as the primary storing scheme, wherein the first storing scheme has a first storing frequency larger than a second storing frequency of the second storing scheme and/or wherein the first storing scheme has a first data size larger than a second data size of the second storing scheme. 
     In one or more exemplary monitor devices, the monitor device is configured to determine whether a secondary storing criterion, e.g. based on an available memory capacity of the memory, is satisfied; and in accordance with a determination that the secondary storing criterion is satisfied, store secondary monitor data in the memory according to a secondary storing scheme. 
     The secondary storing scheme may define a secondary storing frequency for storing monitor data in the memory according to the secondary storing scheme. The secondary storing scheme may define a secondary data size of monitor data stored in a storing operation in the memory according to the secondary storing scheme. The primary storing scheme may be different from the secondary storing scheme. For example, the secondary storing frequency of the secondary storing scheme may be less than the primary storing frequency of the primary storing scheme and/or the secondary data size may be smaller than the primary data size. In other words, the amount of data stored during the primary storing scheme may be larger than the amount of data stored during the secondary storing scheme (over the same time). Thus, the primary monitor data stored per time unit may be more than the secondary monitor data stored per time unit. 
     The primary monitor data may comprise appliance data that are not included in the secondary monitor data. For example, appliance sensor data obtained from or derived from one or more appliance sensors being part of the primary monitor data may not be included in the secondary monitor data. Accordingly, the secondary monitor data may be a reduced data set compared to the primary monitor data. Thereby, optimum or improved usage of the limited memory capacity in the monitor device is provided. 
     The secondary monitor data may comprise compressed appliance sensor data, such as compressed appliance sensor data for one or more sensors that are not regarded as critical, such as an inner sensor of an ostomy appliance or wound dressing. Appliance sensor data for one or more sensors that are not regarded as critical may be omitted in the secondary monitor data. For example, the primary monitor data may comprise appliance sensor data, such as one or more of second appliance sensor data, third appliance sensor data, fourth appliance sensor data, and fifth appliance sensor, that are not included in the secondary monitor data stored in the memory. 
     In one or more exemplary monitor devices, the monitor device is configured to determine whether a tertiary storing criterion, e.g. based on an operating state of the personal care appliance, is satisfied; and in accordance with a determination that the tertiary storing criterion is satisfied, store tertiary monitor data in the memory according to a tertiary storing scheme. 
     The tertiary storing scheme may define a tertiary storing frequency for storing monitor data in the memory according to the tertiary storing scheme. The tertiary storing scheme may define a tertiary data size of monitor data stored in a storing operation in the memory according to the tertiary storing scheme. The tertiary storing scheme may be different from the secondary storing scheme and/or different from the primary storing scheme. For example, the tertiary storing frequency of the secondary storing scheme may be larger than the primary storing frequency of the primary storing scheme and/or the tertiary data size may be larger than the primary data size. In other words, the amount of data stored during the primary storing scheme may be less than the amount of data stored during the tertiary storing scheme (over the same time), e.g. in case the operating state of the personal care appliance changes from a first operating state, e.g. requiring no or little attention, to a second operating state, e.g. requiring high attention. Thus, the primary monitor data stored per time unit may be less than the tertiary monitor data stored per time unit. The tertiary storing criterion being satisfied may indicate that the operating state of the personal care appliance indicates that high attention is required by the user or that operating state of the personal care appliance indicates an increase in the level of required attention by the user. 
     The secondary storing criterion being satisfied may indicate that the available memory capacity of the memory is low. In other words, the monitor device is optionally configured to dynamically adapt storing of the monitor data in the memory in turn resulting in improved utilisation of the memory resources in the monitor device. For example, the secondary storing criterion, also denoted SC_ 2 , may be based on a secondary storage parameter, SP_ 2 , associated with memory and being indicative of available memory capacity of the memory. 
     The secondary storing criterion SC_ 2  may be given as: 
       SC_2:SP_2&lt;TH_M_2, 
     wherein SP_ 2  is the secondary storage parameter and TH_M_ 2  is a secondary memory threshold. 
     In one or more exemplary monitor devices, to determine whether a secondary primary storing criterion is satisfied may comprise to determine or obtain a secondary storage parameter, SP_ 2 , e.g. based on a size of the memory and/or the amount of data stored in the memory since a determination that the primary storing criterion was satisfied, and to compare the secondary storage parameter with a secondary memory threshold TH_M_ 2 . 
     In one or more exemplary monitor devices, to store secondary monitor data comprises compressing primary monitor data in the memory. In other words, the monitor device may be configured to free up memory by compressing the primary monitor data stored during application of the primary storing scheme and store the compressed primary monitor data in the memory. The compressed primary monitor data may be over-written on a part of the primary monitor data. 
     In one or more exemplary monitor devices, to store secondary monitor data comprises deleting, e.g. by over-writing, primary monitor data from the memory. To store secondary monitor data may comprise selecting a part of the primary monitor data, e.g. the oldest primary monitor data and/or primary monitor data of less importance/low priority, and overwriting the selected part of the primary monitor data with the secondary monitor data. 
     In one or more exemplary monitor devices, to store secondary monitor data may comprise compressing and/or deleting monitor data stored in accordance with the transmit storing scheme. 
     In one or more exemplary monitor devices, the monitor device is configured to, in accordance with a determination that the secondary storing criterion is satisfied, select the secondary storing scheme from the plurality of storing schemes or determine the secondary storing scheme. 
     In one or more exemplary monitor devices, to select the secondary storing scheme is based on a first parameter indicative of time since a quality of the connection is less than a threshold. In one or more exemplary monitor devices, to select the secondary storing scheme is based on a first parameter indicative of time since a determination that the primary storing scheme was satisfied. 
     In one or more exemplary monitor devices, to select the secondary storing scheme is based on a second parameter indicative of available memory capacity of the memory. In one or more exemplary monitor devices, to select the secondary storing scheme comprises to select a first storing scheme as the secondary storing scheme if the second parameter indicative of available memory capacity is indicative of a large memory capacity, e.g. if the second parameter is larger than a first memory threshold, and/or to select a second storing scheme as the primary storing scheme if the second parameter indicative of available memory capacity is indicative of a small or reduced memory capacity, e.g. if the second parameter is less than a second memory threshold. In one or more exemplary monitor devices, to select the secondary storing scheme is based on both the first parameter and the second parameter. In one or more exemplary monitor devices, to select the secondary storing scheme is based on an operating state of the personal care appliance. 
     In one or more exemplary monitor devices, the monitor device is configured to determine whether a transmission criterion based on the quality of the connection is satisfied; and in accordance with a determination that the transmission criterion is satisfied, transmit monitor data in the memory to the accessory device. The transmission criterion being satisfied may indicate that the connection is resumed and/or returns to a satisfactory quality. In other words, the monitor device is optionally configured to transmit the monitor data in the memory stored during a time period of no or low-quality connection to the accessory device upon determination of reestablishment of the connection. For example, the transmission criterion, also denoted TC, may be based on a connection parameter, CP, associated with the connection and being indicative of a quality of the connection. 
     The transmission criterion may be given as: 
       TC:CP&gt;TH_T, 
     wherein CP is the connection parameter and TH_T is a transmission threshold. The connection parameter CP may be a signal strength indicator, such as a received signal strength indicator (RSSI) or a received channel power indicator (RCPI). The connection parameter CP may be a signal-to-noise ratio. 
     The transmission criterion may be given as: 
       TC:CP&gt;TH_T, 
     wherein CP is the connection parameter indicative of errors in the connection (large number of errors indicating no or poor connection), such as an error rate (such as a bit error rate or a frame error rate), a number of non-acknowledgements (NACKs), and/or a number of retransmissions, and TH_T is a transmission threshold. 
     In one or more exemplary monitor devices, to transmit monitor data in the memory to the accessory device comprises to transmit the secondary monitor data, and after transmitting the secondary monitor data, to transmit the primary monitor data. Thereby, the accessory device receiving the stored monitor data is able to determine and communicate a current operating state fast, as the secondary monitor data may comprise the most recent and/or most critical data. 
     In one or more exemplary monitor devices, the memory is a flash memory of the transceiver module, and wherein to store primary monitor data in the memory according to a primary storing scheme is based on one or more control parameters output from the processor to the transceiver module. To store secondary monitor data in the memory according to a secondary storing scheme may be based on one or more control parameters output from the processor to the transceiver module. 
     In one or more exemplary monitor devices, the primary monitor data comprises primary ostomy data obtained from an ostomy appliance being the personal care appliance via the first interface or primary wound dressing data obtained from a wound dressing being the personal care appliance via the first interface. In one or more exemplary monitor devices, the secondary monitor data comprises secondary ostomy data obtained from an ostomy appliance being the personal care appliance via the first interface or secondary wound dressing data obtained from a wound dressing being the personal care appliance via the first interface. 
     Further, a method of operating a monitor device for a personal care system comprising a personal care appliance, the monitor device, and one or more accessory devices is disclosed, the monitor device comprising a processor; a memory connected to the processor; a first interface connected to the processor, the first interface configured for connecting the monitor device to the personal care appliance; and a second interface comprising a transceiver module connected to the processor and configured for connecting the monitor device to one or more accessory devices of the personal care system. The method comprises establishing a connection between the monitor device and at least one of the one or more accessory devices; determining whether a primary storing criterion, e.g. based on a quality of the connection, is satisfied; and in accordance with a determination that the primary storing criterion is satisfied, storing primary monitor data in the memory according to a primary storing scheme. 
     In one or more exemplary methods of operating a monitor device, determining whether the primary storing criterion based on a quality of the connection is satisfied comprises determining whether the quality of the connection is below a threshold. 
     In one or more exemplary methods of operating a monitor device, the method comprises transmitting monitor data to the accessory device, wherein transmitting monitor data to the accessory device optionally comprises storing monitor data in the memory according to a transmit storing scheme. The primary storing scheme is different from and optionally requires less memory than the transmit storing scheme. The primary storing scheme may have a primary storing frequency smaller than a transmit storing frequency of the transmit storing scheme and/or the primary storing scheme may have a first data size larger or smaller than a transmit data size of the transmit storing scheme. 
     In one or more exemplary methods of operating a monitor device, storing primary monitor data may comprise compressing and/or deleting monitor data stored in accordance with the transmit storing scheme. 
     In one or more exemplary methods of operating a monitor device, the method comprising, in accordance with a determination that the primary storing criterion is satisfied, selecting the primary storing scheme from a plurality of storing schemes. 
     In one or more exemplary methods of operating a monitor device, selecting the primary storing scheme is based on a first parameter indicative of time since a quality of the connection is less than a threshold. 
     In one or more exemplary methods of operating a monitor device, selecting the primary storing scheme is based on a second parameter indicative of available memory capacity of the memory. 
     In one or more exemplary methods of operating a monitor device, selecting the primary storing scheme is based on an operating state of the personal care appliance. 
     In one or more exemplary methods of operating a monitor device, the method comprises determining whether a secondary storing criterion, e.g. based on an available memory capacity of the memory, is satisfied; and in accordance with a determination that the secondary storing criterion is satisfied, storing secondary monitor data in the memory according to a secondary storing scheme. 
     In one or more exemplary methods of operating a monitor device, storing secondary monitor data comprises compressing primary monitor data in the memory. 
     In one or more exemplary methods of operating a monitor device, storing secondary monitor data comprises deleting primary monitor data from the memory. 
     In one or more exemplary methods of operating a monitor device, storing secondary monitor data may comprise compressing and/or deleting monitor data stored in accordance with the transmit storing scheme. 
     In one or more exemplary methods of operating a monitor device, the method comprises determining whether a tertiary storing criterion, also denoted SC_ 3 , e.g. based on an operating state of the personal care appliance, is satisfied; and in accordance with a determination that the tertiary storing criterion is satisfied, storing tertiary monitor data in the memory according to a tertiary storing scheme. 
     In one or more exemplary methods of operating a monitor device, the method comprises determining whether a transmission criterion based on the quality of the connection is satisfied; and in accordance with a determination that the transmission criterion is satisfied, transmitting monitor data in the memory to the accessory device. 
     In one or more exemplary methods of operating a monitor device, transmitting monitor data in the memory to the accessory device comprises to transmit the secondary monitor data, and after transmitting the secondary monitor data, to transmit the primary monitor data. 
     In one or more exemplary methods of operating a monitor device, the memory is a flash memory of the transceiver module, and storing primary monitor data in the memory according to a primary storing scheme is based on one or more control parameters from the processor to the transceiver module. Storing secondary monitor data in the memory according to a secondary storing scheme may be based on one or more control parameters from the processor to the transceiver module. 
     In one or more exemplary methods of operating a monitor device, the personal care appliance is an ostomy appliance, and the method comprising obtaining primary ostomy data from the ostomy appliance and including the primary ostomy data in the primary monitor data; or the personal care appliance is a wound dressing, and the method comprising obtaining primary wound dressing data from the wound dressing and including the primary wound dressing data in the primary monitor data. 
     It is to be noted that descriptions of the monitor device being configured to perform acts also apply to the corresponding acts in the method of operating a monitor device and vice versa. 
     Also disclosed is a computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a monitor device with an interface, a memory and a processor cause the monitor device to be configured to operate in accordance with methods of operating a monitor device as described herein. 
     The present disclosure provides an accessory device for a personal care system. The personal care system comprises a personal care appliance, a monitor device, and the accessory device. The accessory device comprises a processor; a memory connected to the processor; and an interface configured to connect the accessory device to the monitor device of the personal care system, the interface comprising a transceiver module connected to the processor. The accessory device is configured to establish a connection between the monitor device and the accessory device. The accessory device is configured to receive monitor data from the monitor device. The accessory device is configured to determine an operating state of the personal care appliance based on the monitor data. The accessory device is configured to determine whether a primary criterion, e.g. based on a quality of the connection, is satisfied. The accessory device is configured to, in accordance with a determination that the primary criterion is not satisfied, communicate a first indication indicative of the quality of the connection. 
     The disclosed accessory device is capable of communicating a first indication indicative of a quality of connection to the monitor device. The present disclosure improves the reliability of the monitoring performed by the personal care system, by communicating the first indication indicative of the quality of connection when a quality of the connection is not satisfactory. This permits to notify appropriately the user and to start potentially estimating the operating state without real-time current monitor data. For example, communication of the first indication indicative of a quality of connection to the monitor device helps reducing the risk of a user experiencing a leakage (e.g. output leakage between a user&#39;s skin and the baseplate of the ostomy appliance) from an ostomy appliance in a planned activity. For example, communication of the first indication indicative of a quality of connection to the monitor device helps reducing the risk of a user experiencing a wet wound due to saturated fluid in an absorbent core layer of a wound dressing appliance. In particular, determination and communication the first indication indicative of an estimated operating state, and possibly with a latest operating state, according to the present disclosure is performed based on monitor data indicative of a condition of the ostomy appliance which may not be visible to the user. 
     It is an advantage of the present disclosure that a user of a personal care appliance or a health care professional is able to monitor and plan the use of the personal care appliance with daily life. 
     For example, the accessory device is configured to, in accordance with a determination that the primary criterion is not satisfied, communicate the first indication, e.g. to the user, e.g. via an output device (such as a display and/or a loudspeaker). In one or more exemplary embodiments, the first indication may be communicated by sound. 
     For example, the accessory device is configured to, in accordance with a determination that the primary criterion is not satisfied, communicate the first indication, e.g. to another device, e.g. an external device (such as wearable device and/or a server device). 
     In one or more exemplary accessory devices, the primary criterion based on a quality of the connection is not satisfied when it is determined that the quality of the connection is not above a primary connection threshold. 
     In one or more exemplary accessory devices, the primary criterion based on a quality of the connection is not satisfied when it is determined that the quality of the connection is below a primary connection threshold. The primary criterion not being satisfied may indicate that the connection is lost or that the connection has a low quality or does not have a satisfactory quality to receive monitor data from the monitor device. In other words, the monitor device is optionally configured to communicate the first indication upon determination of no or low-quality connection to the monitor device. For example, the primary criterion, also denoted C_ 1 , may be based on one or more connection parameters associated with the connection and being indicative of a quality of the connection, such as a signal strength indicator, e.g. a received signal strength indicator (RSSI) or a received channel power indicator (RCPI), signal-to-noise ratio, an error rate, e.g. a bit error rate, and/or a frame error rate, a number of non-acknowledgements (NACKs), and/or a number of retransmissions. In other words, the accessory device may be configured to determine whether the connection to the monitor device is lost by determining whether the primary criterion based on the quality of the connection is satisfied. Stated differently, the primary criterion based on a quality of the connection is not satisfied when it is determined that the quality of the connection is degraded (e.g. poor) and/or reduced, leading to a loss of connection to the monitor device. Thus, the accessory device is configured to communicate the first indication in case the connection to the monitor device is of low quality, e.g. lost or degraded. 
     The primary criterion C_ 1  may be given as: 
       C_1:CP&gt;TH_C_1, 
     wherein CP is the connection parameter and TH_C_ 1  is a primary connection threshold. The connection parameter CP may be a signal strength indicator, such as a received signal strength indicator (RSSI) or a received channel power indicator (RCPI). The connection parameter CP may be a signal-to-noise ratio. 
     The primary criterion C_ 1  may be given as: 
       C_1:CP&lt;TH_C_1, 
     wherein CP is the connection parameter indicative of errors in the connection (large number of errors indicating no or poor connection), such as an error rate (such as a bit error rate or a frame error rate), a number of non-acknowledgements (NACKs), and/or a number of retransmissions, and TH_C_ 1  is a primary connection threshold. 
     In one or more exemplary accessory devices, to determine whether a primary criterion, e.g. based on a quality of the connection, is satisfied may comprise to determine or obtain one or more connection parameters, and to compare the connection parameter with a primary connection threshold TH_C_ 1 . 
     The connection parameter may be based on one or more of a signal strength indicator, e.g. a received signal strength indicator (RSSI) or a received channel power indicator (RCPI), signal-to-noise ratio, an error rate, e.g. a bit error rate, and/or a frame error rate, a number of non-acknowledgements (NACKs), and/or a number of retransmissions. 
     For example, the primary criterion based on a quality of the connection is not satisfied when it is determined that the quality of the connection is equal or below the primary connection threshold. The primary connection threshold may be associated with or based on one or more connection parameters, such as signal to noise ratio, an error rate (such as a bit error rate, and/or a frame error rate), a number of non-acknowledgements (NACKs), and/or a number of retransmissions. In one or more exemplary accessory devices, in accordance with a determination that the primary criterion is not satisfied, the accessory device does not receive monitor data any longer or forgo to receive the monitor data. In other words, the accessory device may be configured to determine whether the connection to the monitor device is lost by determining whether the primary criterion based on the quality of the connection is satisfied. Stated differently, the primary criterion based on a quality of the connection is not satisfied when it is determined that the quality of the connection is degraded (e.g. poor) and/or reduced, leading to a loss of connection to the monitor device. 
     In one or more exemplary accessory devices, the accessory device is configured to, in accordance with a determination that the primary criterion is not satisfied, select, from a plurality of indications, the first indication indicative of the quality of the connection. In one or more exemplary accessory devices, the first indication is indicative of the operating state at a time where the primary criterion based on the quality of the connection is not satisfied. For example, the first indication is indicative of the operating state at a time where the connection is lost and/or degraded and/or interrupted. 
     The accessory device is optionally configured to, in accordance with a determination that the primary criterion is not satisfied, determine, such as select, obtain, and/or generate, the first indication indicative of the quality of the connection. For example, the first indication is indicative of the operating state at a time where the connection is lost and/or degraded and/or interrupted. The first indication may be indicative of a time passed since a determination that the primary criterion was not satisfied, e.g. a time passed since the connection was lost and/or degraded and/or interrupted. 
     For example, the first indication may be selected from the plurality of indications comprising an indication indicative of the connection lost and/or degraded, and an indication indicative of the operating state at a time where the primary criterion based on the quality of the connection is not satisfied. 
     In one or more exemplary accessory devices, to select the first indication indicative of the quality of the connection comprises to determine an estimated operating state of the personal care appliance based on one or more previous operating states of the personal care appliance. The one or more previous operating states of the personal care appliance are determined by the accessory device before the time where the primary criterion based on the quality of the connection is not satisfied (e.g. before the time where the connection is lost). 
     In one or more exemplary accessory devices, to determine the estimated operating state of the personal care appliance based on one or more previous operating states of the personal care appliance comprises to predict the estimated operating state of the personal care appliance based on one or more previous operating states of the personal care appliance. In one or more exemplary accessory devices, the first indication is indicative of the estimated operating state. 
     The processor may be configured to determine the estimated operating state based on one or more previous operating states, such as based on one or more operating states previously determined by the accessory device (i.e. prior to loss/degradation of connection). The one or more operating states previously determined by the accessory device may relate the similar personal care appliances as the one currently used by the user. Optionally, one or more operating states previously determined by the accessory device may relate the different personal care appliances as the one currently used by the user, which have the characteristics and/or components which are the same as the one currently used by the user. 
     The processor of the accessory device may be configured to determine the estimated operating state as a future operating state of the personal care appliance based on one or more previous operating states, such as based on one or more (future and/or current) operating states previously determined by the accessory device. 
     It may be envisaged that the processor of the accessory device may be configured to predict the estimated operating state of the personal care appliance by deriving a trend or a function of an operating state and/or the monitor data over the time period, e.g. for the similar personal care appliances as the one currently used by the user, or for similar base plates as the currently used one. The time period may include a time period up to and possibly including a current time. The time period may include a time period from a start time of use of any personal care appliances, to the current time of determination of the estimated operating state. The time period may include a time period from a start time of the loss of connection to the current time. The time period may include a time window that periodically occurs, such as a morning time period, an afternoon time period, a night time period, a daily time period, a weekly time period, etc. 
     The processor of the accessory device may be configured to predict the estimated operating state based on a parameter characterizing a product type of the personal care appliance. The processor of the accessory device may be configured to predict (such as to determine) the estimated operating state based on monitor data obtained for similar product types of personal care appliances previously used by the user. 
     In one or more exemplary accessory devices, the accessory device is configured to, in accordance with a determination that the primary criterion is not satisfied, communicate the first indication indicative of the quality of the connection, by displaying, on a display of the accessory device, a first user interface object representative of the first indication. The first user interface object may be displayed as one or more media, such as text, graphic and/or video. 
     The accessory device may comprise the display configured to display a user interface. The display may comprise a touch sensitive surface. A user interface comprises one or more user interface objects. A user interface may be referred to as a user interface screen. 
     A user interface object refers herein to a graphical representation of an object that is displayed on the display of the accessory device. The user interface object may be user-interactive, or selectable by a user input. For example, an image (e.g., icon), a button, and text (e.g., hyperlink) each optionally constitute a user interface object. The user interface object may form part of a widget. A widget may be seen as a mini-application that may be used by the user and created by the user. A user interface object may comprise a prompt, application launch icon, and/or an action menu. An input, such as first input and/or second input, may comprise a touch (e.g. a tap, a force touch, a long press), a and/or movement of contact (e.g. a swipe gesture, e.g. for toggling). The movement on contact may be detected by a touch sensitive surface, e.g. on a display of an accessory device. Thus, the display may be a touch sensitive display. An input, such as first input and/or second input, may comprise a lift off. An input, such as first input and/or second input, may comprise a touch and a movement followed by a lift off. 
     The display of the accessory device may be configured to detect touch (e.g. the display is a touch-sensitive display), the input comprises a contact on the touch sensitive display. A touch-sensitive display provides an input interface and an output interface between the accessory device and a user. A processor of the accessory device may be configured to receive and/or send electrical signals from/to touch-sensitive display. A touch-sensitive display is configured to display visual output to the user. The visual output optionally includes graphics, text, icons, video, and any combination thereof (collectively termed “graphics”). For example, some or all of the visual output may be seen as corresponding to user interface objects. 
     The processor of the accessory device may be configured to display, on the display, one or more user interfaces, such as user interface screens, including a first user interface and/or a second user interface. A user interface may comprise one or more, such as a plurality of user interface objects. For example, the first user interface may comprise a first primary user interface object and/or a first secondary user interface object. A second user interface may comprise a second primary user interface object and/or a second secondary user interface object. A user interface object, such as the first primary user interface object and/or the second primary user interface object, may represent an operating state of the personal care appliance. 
     In one or more exemplary accessory devices, to communicate the first indication comprises to display, on a visual interface (e.g. a display) of the accessory device, a user interface comprising a user interface object representative of the first indication, such as a first user interface object representative of the first indication indicative of the quality of the connection and/or representative of a first operating state of the personal care appliance, and/or representative of a second operating state of the personal care appliance. 
     In one or more exemplary accessory devices, the first user interface object representative of the first indication comprises a first primary user interface object representative of the first indication, and/or a first primary user interface object representative one or more operating states. 
     For example, the first user interface object may comprise one or more visual indicators representative of the first indication, such as a first visual indicator, a second visual indicator, a third visual indicator. For example, the visual indicator may be in a shape characterizing the personal care appliance. The visual change may be performed by a change of one or more of: colour, shape, blurring, and animation. For example, the visual indicators may be a text prompt indicating to the user the dynamic internal operating state of the personal care appliance. 
     In one or more exemplary accessory devices, to communicate the first indication comprises to notify the user via the interface, such as by displaying a notification on a display of the accessory device. The notification may comprise the first user interface object representative of the first indication. The notification may comprise a notification indicator to open an application related to the personal care appliance. The accessory device may be configured to detect an input on the notification indicator. The accessory device may be configured to, in response to the input, opening the application related to the personal care appliance. The accessory device may be configured to, in response to the opening of the application, to display a user interface object representative of an operating state (such as a latest operating state and/or an estimated operating state). 
     In one or more exemplary accessory devices, the accessory device is configured to determine whether a secondary criterion based on the quality of the connection is satisfied. For example, the secondary criterion based on a quality of the connection may be satisfied when it is determined that the quality of the connection is above a secondary connection threshold. In one or more embodiments, the primary connection threshold is the same as the secondary connection threshold. In one or more embodiments, the primary connection threshold is different from the secondary connection threshold. It may be appreciated that having the primary connection threshold different from the secondary connection threshold may lead to a reduction of a ping pong effect between connection lost and connection re-established, thus reducing the number of indications to the user by avoiding ping pong between the communication of the first indication and the communication of the second indication. 
     The secondary criterion being satisfied may indicate that the connection is resumed and/or returns to a satisfactory quality. For example, the secondary criterion, also denoted C_ 2 , may be based on a connection parameter, CP, associated with the connection and being indicative of a quality of the connection. 
     The secondary criterion C_ 2  may be given as: 
       C_2:CP&gt;TH_C_2, 
     wherein CP is the connection parameter and TH_C_ 2  is a secondary connection threshold. The connection parameter CP may be a signal strength indicator, such as a received signal strength indicator (RSSI) or a received channel power indicator (RCPI). The connection parameter CP may be a signal-to-noise ratio. 
     The secondary criterion C_ 2  may be given as: 
       C_2:CP&lt;TH_C_2, 
     wherein CP is the connection parameter indicative of errors in the connection (large number of errors indicating no or poor connection), such as an error rate (such as a bit error rate or a frame error rate), a number of non-acknowledgements (NACKs), and/or a number of retransmissions, and TH_C_ 2  is a secondary connection threshold. 
     In one or more exemplary accessory devices, to determine whether a secondary criterion, e.g. based on a quality of the connection, is satisfied may comprise to determine or obtain one or more connection parameters, and to compare the connection parameter with a secondary connection threshold TH_C_ 2 . 
     The connection parameter of the secondary criterion may be based on one or more of a signal strength indicator, e.g. a received signal strength indicator (RSSI) or a received channel power indicator (RCPI), signal-to-noise ratio, an error rate, e.g. a bit error rate, and/or a frame error rate, a number of non-acknowledgements (NACKs), and/or a number of retransmissions. 
     In one or more exemplary accessory devices, the accessory device is configured to in accordance with a determination that the secondary criterion is satisfied (connection resumed or has increased quality), communicate a second indication indicative of the quality of the connection. In one or more exemplary accessory devices, the accessory device is configured to in accordance with a determination that the secondary criterion is satisfied, determine the second indication. 
     The accessory device is optionally configured to, in accordance with a determination that the secondary criterion is satisfied, determine, such as select, obtain, and/or generate, the second indication indicative of the quality of the connection. For example, the second indication may be indicative of an operating state based on monitor data received from the monitor device after the connection has been resumed (secondary criterion is satisfied), such as based on primary monitor data and/or secondary monitor data stored in the monitor device during loss of connection and received by the accessory device after the connection has been resumed (secondary criterion is satisfied). 
     In one or more exemplary accessory devices, the second indication is indicative of the operating state at a time where the secondary criterion based on a quality of the connection is satisfied. For example, the second indication is indicative of the operating state at a time where the connection is resumed, such as re-established. 
     In one or more exemplary accessory devices, the accessory device is configured to, in accordance with a determination that the secondary criterion is satisfied, resume reception of the monitor data from the monitor device. For example, the monitor data comprises one or more of: monitor data accumulated during a period of lost connection until resumption of connection (primary monitor data and/or secondary monitor data stored in the monitor device during lost connection), and real-time monitor data (e.g. “live” monitor data, e.g. monitor data received with little or no delay after resumption of connection). 
     In one or more exemplary accessory devices, the monitor data comprises primary ostomy data obtained from an ostomy appliance being the personal care appliance via the interface or primary wound dressing data obtained from a wound dressing being the personal care appliance via the interface. 
     In one or more exemplary accessory devices, the accessory device is configured to, in accordance with a determination that the secondary criterion is satisfied, communicate the second indication indicative of the quality of the connection, by displaying, on the display of the accessory device, a second user interface object representative of the second indication. For example, the second user interface objection may convey: “something happened” or “everything is still good” (etc.) during the period of lost connection. For example, to communicate the second indication may comprise to notify the user via the interface, such as by displaying a notification indicative of the second indication on a display of the accessory device. 
     The present disclosure provides a method of operating an accessory device for a personal care system. The personal care system comprises a personal care appliance, a monitor device, and the accessory device. The method comprises establishing a connection between the monitor device and the accessory device. The method comprises receiving monitor data from the monitor device. The method comprises determining an operating state of the personal care appliance based on the monitor data. The method comprises determining whether a primary criterion based on a quality of the connection is satisfied. The method comprises, in accordance with a determination that the primary criterion is not satisfied, communicating a first indication indicative of the quality of the connection. 
     In one or more exemplary methods of operating an accessory device, the primary criterion based on a quality of the connection is not satisfied when it is determined that the quality of the connection is not above a primary connection threshold. 
     In one or more exemplary methods of operating an accessory device, the method comprises, in accordance with a determination that the primary criterion is not satisfied, selecting, from a plurality of indications, the first indication indicative of the quality of the connection. 
     In one or more exemplary methods of operating an accessory device, communicating the first indication indicative of the quality of the connection in accordance with a determination that the primary criterion is not satisfied comprises displaying, on a display of the accessory device, a first user interface object representative of the first indication. 
     In one or more exemplary methods of operating an accessory device, selecting the first indication indicative of the quality of the connection comprises determining an estimated operating state of the personal care appliance based on one or more previous operating states of the personal care appliance. 
     In one or more exemplary methods of operating an accessory device, determining the estimated operating state of the personal care appliance based on the one or more previous operating states of the personal care appliance comprises predicting the estimated operating state of the personal care appliance based on the one or more previous operating states of the personal care appliance. 
     In one or more exemplary methods of operating an accessory device, the first indication is indicative of the operating state at a time where the primary criterion based on a quality of the connection is not satisfied. 
     In one or more exemplary methods of operating an accessory device, the first indication is indicative of the estimated operating state. 
     In one or more exemplary methods of operating an accessory device, the method comprises determining that a secondary criterion based on the quality of the connection is satisfied. 
     In one or more exemplary methods of operating an accessory device, the method comprises, in accordance with a determination that the secondary criterion is satisfied, communicating a second indication indicative of the quality of the connection. 
     In one or more exemplary methods of operating an accessory device, the second indication is indicative of the operating state at a time where the secondary criterion based on the quality of the connection is satisfied. For example, the second indication is optionally indicative of the operating state at a time where the connection is resumed, such as re-established. 
     In one or more exemplary methods of operating an accessory device, the method comprises resuming reception of the monitor data from the monitor device in accordance with a determination that the secondary criterion is satisfied. 
     In one or more exemplary methods of operating an accessory device, the monitor data comprises primary ostomy data obtained from an ostomy appliance being the personal care appliance via the interface or wound dressing data obtained from a wound dressing being the personal care appliance via the interface. 
     In one or more exemplary methods of operating an accessory device, in accordance with a determination that the secondary criterion is satisfied, communicating the second indication indicative of the quality of the connection comprises displaying, on the display of the accessory device, a second user interface object representative of the second indication. 
     It is to be noted that descriptions of the accessory device being configured to perform acts also apply to the corresponding acts in the method of operating an accessory device and vice versa. 
     Also disclosed is a computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by an accessory device with an interface, a memory and a processor cause the accessory device to perform any of the methods of operating an accessory device as described herein. 
       FIG.  1    illustrates an exemplary personal care system  1  embodied as an ostomy system  1 A. The personal care system  1  (ostomy system  1 A) comprises a personal care appliance  2  embodied as an ostomy appliance  2 A including a base plate  4  and an ostomy pouch (not shown). Further, the personal care system  1  comprises a monitor device  6  and an accessory device  8  (mobile telephone, smartphone). The monitor device  6  is connectable to the personal care appliance  2 , such as to base plate  4  and/or to an electrode assembly of or mounted to the personal care appliance, via respective first connectors of the monitor device  6  and base plate  4 /electrode assembly. The monitor device  6  is configured for wireless communication via connection  9  with the accessory device  8 . Optionally, the accessory device  8  is configured to communicate with a server device  10  of the personal care system  1 , e.g. via network  12 . The server device  10  may be operated and/or controlled by the ostomy appliance manufacturer and/or a service centre. Appliance data (ostomy data in the shown ostomy system) or parameter data based on the appliance data (ostomy data in the shown ostomy system) are obtained from electrodes/sensors of electrode assembly embedded in or mounted to the personal care appliance  2  with the monitor device  6 . The monitor device  6  processes the appliance data and/or parameter data based on the appliance data to determine monitor data that are transmitted to the accessory device  8  via connection  9 . In the illustrated personal care system, the accessory device  8  is a mobile phone, however the accessory device  8  may be embodied as another handheld device, such as a tablet device, or a wearable, such as a watch or other wrist-worn electronic device. Accordingly, the monitor device  6  is configured to determine monitor data and transmit the monitor data to the accessory device  8 . The base plate  4  comprises a coupling member  14  in the form of a coupling ring  16  for coupling an ostomy pouch (not shown) to the base plate (two-part ostomy appliance). The base plate  4  has a stomal opening  18  with a center point  19 . The size and/or shape of the stomal opening  18  is typically adjusted by the user or nurse before application of the ostomy appliance to accommodate the user&#39;s stoma. 
     The personal care system  1  optionally comprises a docking station  20  forming an accessory device of the personal care system  1 . The docking station  20  comprises a docking monitor interface including a first connector  22  configured for electrically and/or mechanically connecting the monitor device  6  to the docking station  20 . The docking monitor interface may be configured for wirelessly connecting the monitor device  6  to the docking station  20 . The docking station  20  comprises a user interface  24  for receiving user input and/or providing feedback to the user on the operational state of the docking station  20 . The user interface  24  may comprise a touch-screen. The user interface  24  may comprise one or more physical buttons and/or one or more visual indicators, such as light emitting diodes. 
       FIG.  2    is a schematic block diagram of an exemplary monitor device. The monitor device  6  comprises a monitor device housing  100 , a processor  101 , and one or more interfaces, the one or more interfaces including a first interface  102  (appliance interface) and a second interface  104  (accessory interface). The monitor device  6  comprises a memory  106 / 106 A for storing monitor data based on appliance data and/or parameter data based on the monitor data. The memory  106 / 106 A is optionally connected to the processor  101 . The memory  106  is embedded optionally as flash memory in the second interface  104   
     The first interface  102  is configured as an appliance interface for electrically and/or mechanically connecting the monitor device  6  to the personal care appliance, e.g. ostomy appliance  2 A or a wound dressing appliance. The first interface  102  comprises a plurality of terminals for forming electrical connections with respective terminals of the personal care appliance  2  (electrode assembly). The first interface  102  optionally comprises between four and 20 terminals, such as between six and twelve terminals, including a ground terminal  108 , a first terminal  110 , a second terminal  112  and a third terminal  114 . The first interface  102  optionally comprises a fourth terminal  116  and a fifth terminal  118 . In one or more exemplary monitor devices, the first interface  102  optionally comprises a sixth terminal and/or a seventh terminal. The first interface  102  of the monitor device  6  comprises a coupling part  120  for forming a mechanical connection, such as a releasable coupling between the monitor device and the personal care appliance, e.g. with a base plate of an ostomy appliance and/or an electrode assembly of ostomy system/wound dressing system. The coupling part  120  and the terminals  108 ,  110 ,  112 ,  114 ,  116 , and  118  of the first interface  102  form (at least part of) a first connector of the monitor device  6 . 
     The monitor device  6  comprises a power unit  121  for powering the monitor device and active components thereof, i.e. the power unit  121  is connected to the processor  101 , the first interface  102 , and the second interface  104 . The power unit comprises a battery and charging circuitry. The charging circuitry is connected to the battery and optionally to terminals of the first interface  102  for charging the battery via terminals of the first interface, e.g. terminals of the first connector. The charging circuitry may be configured for wireless charging of the battery. 
     The second interface  104  of monitor device is configured as an accessory interface for connecting the monitor device  6  to one or more accessory devices such as accessory device  8 . The second interface  104  comprises an antenna  122  and a wireless transceiver  124  also denoted transceiver module, the wireless transceiver  124  connected to the processor  101  and configured for wireless communication with accessory device(s), such as configured for connecting the monitor device to the one or more accessory devices of the personal care system. Optionally, the second interface  104  comprises a loudspeaker  126  and/or a haptic feedback element  128  for provision of respective audio signal and/or haptic feedback to the user. The memory  106  may be an internal memory, such as flash memory of the wireless transceiver  124 . Thereby, a separate memory module can be omitted which provides a simpler and lighter/smaller monitor device. 
     The monitor device  6  optionally comprises a sensor unit  140  connected to the processor  101 . The sensor unit  140  may comprise a temperature sensor for feeding temperature data to the processor  101  and/or a G-sensor or accelerometer for feeding acceleration data to the processor  101 . 
     The monitor device/processor  101 /transceiver module  124  is configured to establish a connection between the monitor device and at least one of the one or more accessory devices, such as connection  9  to accessory device  8 , determine whether a primary storing criterion based on a quality of the connection is satisfied; and in accordance with a determination that the primary storing criterion is satisfied, store primary monitor data  142  in the memory  106  according to a primary storing scheme SS_ 1 . 
     The monitor device/processor  101 /transceiver module  124  is configured to transmit monitor data to the accessory device, wherein to transmit monitor data to the accessory device optionally comprises to store monitor data in the memory according to a transmit storing scheme, e.g. use the memory as a buffer for transmission. The primary storing scheme is different from the transmit storing scheme. The primary storing scheme may have a primary storing frequency smaller than a transmit storing frequency of the transmit storing scheme and/or the primary storing scheme may have a first data size larger than a transmit data size of the transmit storing scheme. 
     The primary storing criterion SC_ 1  is optionally given as: SC_ 1 : CP_ 1 &lt;TH_S_ 1 , wherein CP_ 1  is a primary connection parameter being a received channel power indicator (RCPI) indicative of a quality of the connection and obtained from the transceiver module  124  and TH_S_ 1  is a primary storing threshold. In other words, the primary storing criterion based on a quality of the connection is satisfied when it is determined that the quality of the connection is below a threshold. 
     The monitor device/processor  101  is optionally configured to, in accordance with a determination that the primary storing criterion is satisfied, select or determine the primary storing scheme SS_ 1  from a plurality of storing schemes. In other words, the primary storing scheme may be selected from a set of storing schemes comprising a plurality of storing schemes. To select the primary storing scheme is optionally based on a first parameter indicative of time since a quality of the connection is less than a threshold (i.e. a time since the primary storing criterion was satisfied). 
     To select the primary storing scheme is optionally based on a second parameter indicative of available memory capacity of the memory. 
     To select the primary storing scheme is optionally based on an operating state of the personal care appliance and/or appliance data, such as one or more of first appliance sensor data, second appliance sensor data, third appliance sensor data, fourth appliance sensor data, fifth appliance sensor data, and sixth appliance sensor data obtained from respective sensors/electrode pairs of the personal care appliance via the first interface  102 . To store primary monitor data  142  in the memory  106  according to a primary storing scheme SS_ 1  may comprise to store less monitor data than is transmitted during normal transmission. 
     The monitor device/processor  101  is optionally configured to store secondary monitor data  144  in the memory  106  according to a secondary storing scheme as described below. 
     The monitor device/processor  101  is optionally configured to determine whether a secondary storing criterion SC_ 2 , e.g. based on an available memory capacity of the memory is satisfied; and in accordance with a determination that the secondary storing criterion is satisfied, store secondary monitor data  144  in the memory  106  according to a secondary storing scheme SS_ 2 . To store secondary monitor data  144  in the memory  106  according to a secondary storing scheme SS_ 2  may comprise to store less monitor data and/or to store monitor data with reduced frequency and/or data size than is stored with the primary storing scheme. 
     The secondary storing criterion SC_ 2  being satisfied may indicate that the available memory capacity of the memory is low. In other words, the monitor device is optionally configured to dynamically adapt storing of the monitor data in the memory in turn resulting in improved utilisation of the memory resources in the monitor device. For example, the secondary storing criterion, also denoted SC_ 2 , may be based on a secondary storage parameter, SP_ 2 , associated with memory and being indicative of available memory capacity of the memory. The secondary storing criterion SC_ 2  may be given as: SC_ 2 : SP_ 2 &lt;TH_M_ 2 , wherein SP_ 2  is the secondary storage parameter and TH_M_ 2  is a secondary memory threshold. 
     In monitor device  6 , to store secondary monitor data  144  optionally comprises compressing primary monitor data  142  or at least a part thereof in the memory. In other words, the monitor device  6  may be configured to free up memory in memory  106  by compressing the primary monitor data  144  stored during application of the primary storing scheme SS_ 1  and store the compressed primary monitor data in the memory. The compressed primary monitor data may be over-written on a part of the primary monitor data. In this way, primary monitor data of high importance may be kept in the memory, while less important primary monitor data may be deleted, 
     In monitor device  6 , to store secondary monitor data optionally comprises deleting, e.g. by over-writing, primary monitor data from the memory. To store secondary monitor data may comprise selecting a part of the primary monitor data, e.g. the oldest primary monitor data and/or primary monitor data of less importance/low priority, and overwriting the selected part of the primary monitor data with the secondary monitor data. 
     In monitor device  6 , the monitor device is optionally configured to, in accordance with a determination that the secondary storing criterion is satisfied, select the secondary storing scheme from the plurality of storing schemes or determine the secondary storing scheme. 
     In monitor device  6 , to select the secondary storing scheme is optionally based on a first parameter indicative of time since a quality of the connection is less than a threshold. In monitor device  6 , to select the secondary storing scheme is optionally based on a first parameter indicative of time since a determination that the primary storing scheme was satisfied. 
     In monitor device  6 , to select the secondary storing scheme is optionally based on a second parameter indicative of available memory capacity of the memory. In monitor device  6 , to select the secondary storing scheme optionally comprises to select a first storing scheme as the secondary storing scheme if the second parameter indicative of available memory capacity is indicative of a large memory capacity, e.g. if the second parameter is larger than a first memory threshold, and/or to select a second storing scheme as the primary storing scheme if the second parameter indicative of available memory capacity is indicative of a small or reduced memory capacity, e.g. if the second parameter is less than a second memory threshold. The act to select the secondary storing scheme may be based on both the first parameter and the second parameter. In monitor device  6 , to select the secondary storing scheme is optionally based on an operating state of the personal care appliance and/or appliance data, such as one or more of first appliance sensor data, second appliance sensor data, third appliance sensor data, fourth appliance sensor data, fifth appliance sensor data, and sixth appliance sensor data obtained from respective sensors/electrode pairs of the personal care appliance via the first interface  102 . 
     The monitor device  6  is optionally configured to determine whether a transmission criterion TC based on the quality of the connection is satisfied; and in accordance with a determination that the transmission criterion is satisfied, transmit monitor data, including primary monitor data  142  and/or secondary monitor data  144 , in the memory  106  to the accessory device. The transmission criterion being satisfied may indicate that the connection is resumed and/or returns to a satisfactory quality. In other words, the monitor device is optionally configured to transmit the monitor data in the memory stored during a time period of no or low-quality connection to the accessory device upon determination of reestablishment of the connection. For example, the transmission criterion, also denoted TC, may be based on a connection parameter, CP, associated with the connection and being indicative of a quality of the connection. The transmission criterion is optionally given as: TC: CP&gt;TH_T, wherein CP is the connection parameter being a received channel power indicator (RCPI) from the transceiver module  124  and TH_T is a transmission threshold. 
     In monitor device  6 , to transmit monitor data in the memory to the accessory device optionally comprises to transmit the secondary monitor data  144 , and after transmitting the secondary monitor data  144 , to transmit the primary monitor data  146 . Thereby, the accessory device receiving the stored monitor data is able to determine and communicate a current operating state fast after resuming connection. 
     In one or more exemplary monitor devices, the primary monitor data comprises primary appliance data e.g. primary ostomy data obtained from an ostomy appliance being the personal care appliance via the first interface or primary wound dressing data obtained from a wound dressing being the personal care appliance via the first interface. In one or more exemplary monitor devices, the secondary monitor data comprises secondary appliance data, e.g. secondary ostomy data obtained from an ostomy appliance being the personal care appliance via the first interface or secondary wound dressing data obtained from a wound dressing being the personal care appliance via the first interface. 
     The processor  101  is configured to obtain appliance data based on appliance measurements via the terminals of the first interface  102 . The processor  101  is configured to determine monitor data such as primary monitor data and/or secondary monitor data, based on the appliance data and optionally in accordance with a respective storing scheme. 
     The processor  101  may be optionally configured to perform any of the operations disclosed in  FIG.  3    (such as any one or more of S 308 , S 310 , S 312 , S 314 , S 316 , S 316 A, S 316 B, S 317 , S 318 , S 320 ). The operations of the monitor device  100  may be embodied in the form of executable logic routines (such as, lines of code, software programs, etc.) that are stored on a non-transitory computer readable medium (such as, internal memory in the processor  101  or external memory) and are executed by the processor  101 ). 
     Furthermore, the operations of the monitor device  100  may be considered a method that the monitor device  100  is configured to carry out. Also, while the described functions and operations may be implemented in software, such functionality may as well be carried out via dedicated hardware or firmware, or some combination of hardware, firmware and/or software. 
     The memory  106  and/or  106 A may be one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, a random access memory (RAM), or other suitable device. In a typical arrangement, the memory  106  may include a non-volatile memory for long term data storage and a volatile memory that functions as system memory for the processor  106 . The memory  106 ,  106 A may exchange data with the processor  101  over a data bus. Control lines and an address bus between the memory  101  and the processor  402  also may be present (not shown in  FIG.  2   ). The memory  106 ,  106 A is considered a non-transitory computer readable medium. 
       FIG.  3    shows a flow diagram of an example method  300  of operating a monitor device for a personal care system, such as monitor device  6  of  FIG.  2   . 
     The method  300  comprises establishing S 302  a connection between the monitor device and at least one of the one or more accessory devices; optionally transmitting S 304  monitor data MD to the accessory device via the connection, determining S 308  whether a primary storing criterion SC_ 1  based on a quality of the connection is satisfied; and in accordance with a determination that the primary storing criterion SC_ 1  is satisfied, storing S 310  primary monitor data MD_ 1  in the memory according to a primary storing scheme SS_ 1 . 
     In method  300 , the act of determining S 308  whether the primary storing criterion SC_ 1  based on a quality of the connection is satisfied optionally comprises determining whether the quality of the connection is below a threshold, e.g. wherein the primary storing criterion SC_ 1  may be given as: SC_ 1 : CP_ 1 &lt;TH_S_ 1 , wherein CP_ 1  is the primary connection parameter being a received channel power indicator (RCPI) and TH_S_ 1  is a primary storing threshold. 
     The method  300  optionally comprises, in accordance with a determination that the primary storing criterion SC_ 1  is satisfied, selecting S 312  the primary storing scheme SS_ 1  from a plurality of storing schemes. Selecting S 312  the primary storing scheme SS_ 1  is optionally based on one or more of a first parameter indicative of time since a quality of the connection is less than a threshold, a second parameter indicative of available memory capacity of the memory, and an operating state of the personal care appliance. The method  300  optionally comprises, in accordance with a determination that the primary storing criterion SC_ 1  is not satisfied proceed to transmitting S 304  monitor data MD to the accessory device via the connection. 
     In method  300 , transmitting S 304  monitor data to the accessory device optionally comprises storing S 304 B monitor data in the memory according to a transmit storing scheme. The primary storing scheme SS_ 1  is different from and optionally requires less memory than the transmit storing scheme SS_T. The primary storing scheme SS_ 1  may have a primary storing frequency SF_ 1  smaller than a transmit storing frequency SF_T of the transmit storing scheme SS_T and/or the primary storing scheme SS_ 1  may have a first data size DS_ 1  smaller than a transmit data size DS_T of the transmit storing scheme SS_T. 
     The method  300  optionally comprises determining S 314  whether a secondary storing criterion, e.g. based on an available memory capacity of the memory, is satisfied; and in accordance with a determination that the secondary storing criterion is satisfied, storing S 316  secondary monitor data MD_ 2  in the memory according to a secondary storing scheme SS_ 2  different from the primary storing scheme SS_ 1 . Storing S 316  secondary monitor data MD_ 2  may comprise compressing S 316 A primary monitor data MD_ 1  in the memory optionally in accordance with a determination that the available memory capacity of the memory is less than a threshold, e.g. zero. Storing S 316  secondary monitor data MD_ 2  may comprise deleting  316 B primary monitor data MD_ 1  or at least a part thereof from the memory. 
     The method  300  optionally comprises, in accordance with a determination that the secondary storing criterion SC_ 2  is satisfied, selecting S 317  the secondary storing scheme SS_ 2  from a plurality of storing schemes. Selecting S 317  the secondary storing scheme SS_ 2  is optionally based on one or more of a first parameter indicative of time since a quality of the connection is less than a threshold, a second parameter indicative of available memory capacity of the memory, and an operating state of the personal care appliance 
     The method  300  optionally comprises determining S 318 , e.g. in accordance with a determination that the secondary storing criterion is not satisfied, whether a transmission criterion TC based on the quality of the connection is satisfied; and in accordance with a determination that the transmission criterion is satisfied, transmitting S 304 A monitor data, such as primary monitor data and/or secondary monitor data, in the memory to the accessory device. The method  300  may in accordance with a determination that the transmission criterion is not satisfied in S 318 , proceed to storing S 310  primary monitor data in the memory or selecting S 312  the primary storing scheme. Transmitting S 304 A monitor data in the memory to the accessory device optionally comprises to transmit the secondary monitor data, and after transmitting the secondary monitor data, to transmit the primary monitor data. 
     The method  300  optionally comprises determining S 320 , e.g. after storing S 316  secondary monitor data in the memory, whether a transmission criterion TC based on the quality of the connection is satisfied; and in accordance with a determination that the transmission criterion is satisfied, transmitting S 304 A monitor data, such as primary monitor data and/or secondary monitor data, in the memory to the accessory device. The method  300  may in accordance with a determination that the transmission criterion is not satisfied in S 320 , proceed to storing S 316  secondary monitor data in the memory or selecting S 317  the secondary storing scheme. 
       FIG.  4    is a block diagram illustrating an exemplary accessory device  400  according to the present disclosure. The accessory device  400  forms part of a personal care system, such as an ostomy system or a wound dressing system and is capable of supporting the monitoring of the operating state of an ostomy appliance or a wound dressing appliance to be placed on a user&#39;s skin. The accessory device  400  comprises a memory  401 ; a processor  402  coupled to the memory  401 ; and an interface  403 , coupled to the processor  402 . 
     Peripheral devices, such as memory  401  and/or interface  403  can be operatively and communicably coupled to the processor  402  via a bus for communicating data. The processor  402  can be a central processing unit (CPU), but other suitable microprocessors are also contemplated. 
     The interface  403  is configured to connect the accessory device to the monitor device of the personal care system, the interface comprising a transceiver module  403 A connected to the processor  402 . 
     The interface  403  may be configured to communicate with one or more devices of the personal care system. The one or more devices comprising a monitor device, and/or a personal care appliance configured to be placed on a skin surface of a user or on any additional seals. The interface  403  may comprise a display  403 B as a visual interface to the user. The interface  403  is configured to establish a connection between the monitor device and the accessory device. 
     The interface  403  is configured to receive monitor data from the monitor device, such as to receive or retrieve the monitor data from the one or more devices. The monitor data may be indicative of a condition of the personal care appliance, such as a condition of a proximal side of a layer of the personal care appliance that is directed towards the skin surface or a condition of an absorbent core layer of the personal care appliance. In one or more exemplary accessory devices, the monitor data comprises appliance data, e.g. ostomy data or wound dressing data, obtained via the interface  403  from an ostomy appliance being the personal care appliance or from a wound dressing being the personal care appliance, respectively. 
     The processor  402  may be configured to determine an operating state of the personal care appliance based on the monitor data. 
     The processor  402  may be configured to determine whether a primary criterion based on a quality of the connection is satisfied. In one or more exemplary accessory devices, the primary criterion based on a quality of the connection is not satisfied when it is determined that the quality of the connection is not above a primary connection threshold. For example, the primary criterion based on a quality of the connection is not satisfied when it is determined that the quality of the connection is equal or below the primary connection threshold. 
     For example, the primary criterion, also denoted C_ 1 , may be based on one or more connection parameters associated with the connection and being indicative of a quality of the connection, such as a signal strength indicator, e.g. a received signal strength indicator (RSSI) or a received channel power indicator (RCPI), signal-to-noise ratio, an error rate, e.g. a bit error rate, and/or a frame error rate, a number of non-acknowledgements (NACKs), and/or a number of retransmissions. In other words, the accessory device may be configured to determine whether the connection to the monitor device is lost by determining whether the primary criterion based on the quality of the connection is satisfied. Stated differently, the primary criterion based on a quality of the connection is not satisfied when it is determined that the quality of the connection is degraded (e.g. poor) and/or reduced, leading to a loss of connection to the monitor device. Thus, the accessory device is configured to communicate the first indication in case the connection to the monitor device is of low quality, e.g. lost or degraded. 
     The processor  402  may be configured to in accordance with a determination that the primary criterion is not satisfied, communicate, e.g. via the interface  403 , a first indication indicative of the quality of the connection to the user. For example, the processor  402  may be configured to, in accordance with a determination that the primary criterion is not satisfied, communicate the first indication, e.g. to the user, e.g. via an output device (such as a display  403 B and/or a loudspeaker). In one or more exemplary embodiments, the first indication may be communicated by sound. For example, the processor  402  is configured to, in accordance with a determination that the primary criterion is not satisfied, communicate, via the interface  403  (e.g. a transceiver module  403 A), the first indication, e.g. to another device, e.g. an external device (such as wearable device, a smartphone, and/or a server device). 
     The personal care system comprises one or more of: an ostomy system, and a wound care system. 
     The accessory device  400  is capable of communicating a first indication indicative of a quality of the connection. The present disclosure improves the reliability of the monitoring performed by the personal care system, by communicating the first indication indicative of the quality of connection when a quality of the connection is not satisfactory. The accessory device  400  can notify appropriately the user and to start potentially estimating the operating state without real-time current monitor data. For example, communication of the first indication indicative of a quality of connection to the monitor device helps reducing the risk of a user experiencing a leakage (e.g. output leakage between a user&#39;s skin and the baseplate of the ostomy appliance) from an ostomy appliance in a planned activity and/or wet wound from a saturated wound dressing appliance. In particular, determination and communication the first indication indicative of an estimated operating state, and possibly with a latest operating state, according to the present disclosure is performed based on monitor data indicative of a condition of the ostomy appliance which may not be visible to the user. 
     In one or more exemplary accessory devices, the processor  402  is configured to, in accordance with a determination that the primary criterion is not satisfied, select, from a plurality of indications, the first indication indicative of the quality of the connection. In one or more exemplary accessory devices, the first indication is indicative of the operating state at a time where the primary criterion based on the quality of the connection is not satisfied. For example, the first indication is indicative of the operating state at a time where the connection is lost and/or degraded and/or interrupted. For example, the first indication may be selected from the plurality of indications comprising an indication indicative of the connection lost and/or degraded, and an indication is indicative of the operating state at a time where the primary criterion based on the quality of the connection is not satisfied. 
     In one or more exemplary accessory devices, to select the first indication indicative of the quality of the connection comprises to determine an estimated operating state of the personal care appliance based on one or more previous operating states of the personal care appliance. For example, the processor  402  determines the estimated operating state of the personal care appliance based on one or more previous operating states, and selects the first indication amongst a plurality of indications including an indication indicative of the estimated operating state. The one or more previous operating states of the personal care appliance are determined by the accessory device before the time where the primary criterion based on the quality of the connection is not satisfied (e.g. before the time where the connection is lost). In one or more exemplary accessory devices, the first indication is indicative of the estimated operating state. 
     In one or more exemplary accessory devices, to determine the estimated operating state of the personal care appliance based on one or more previous operating states of the personal care appliance comprises to predict the estimated operating state of the personal care appliance based on the one or more previous operating states of the personal care appliance. For example, the processor  402  predicts the estimated operating state based on one or more previous operating states, such as based on one or more operating states previously determined by the accessory device (i.e. prior to loss of connection). The one or more operating states previously determined by the accessory device may relate the similar personal care appliances as the one currently used by the user. Optionally, one or more operating states previously determined by the accessory device may relate the different personal care appliances as the one currently used by the user, which have the characteristics and/or components which are the same as the one currently used by the user. Optionally, the processor  402  may be configured to determine the estimated operating state as a future operating state of the personal care appliance based on one or more previous operating states, such as based on one or more (future and/or current) operating states previously determined by the accessory device. In one or more exemplary accessory devices, the processor  402  may comprise a predictor. The predictor may be configured to predict operating state(s) based on a prediction function. It may be envisaged that the processor  402  may be configured to predict the estimated operating state of the personal care appliance by deriving a trend or a function of an operating state and/or the monitor data over the time period, e.g. for the similar personal care appliances as the one currently used by the user, or for similar base plates as the currently used one. The time period may include a time period up to and possibly including a current time. The time period may include a time period from a start time of use of any personal care appliances, to the current time of determination of the estimated operating state. The time period may include a time period from a start time of the loss of connection to the current time. The time period may include a time window that periodically occurs, such as a morning time period, an afternoon time period, a night time period, a daily time period, a weekly time period etc. The processor  402  may be configured to predict the estimated operating state based on a parameter characterizing a product type of the personal care appliance. The processor may be configured to predict (such as to determine) the estimated operating state based on monitor data obtained for similar product types of personal care appliances previously used by the user. 
     In one or more exemplary accessory devices, the processor  402  is configured to, in accordance with a determination that the primary criterion is not satisfied, communicate, e.g. via the interface  403 , the first indication indicative of the quality of the connection, by displaying, on a display  403 B, a first user interface object representative of the first indication. The first user interface object may be displayed as one or more media, such as text, graphic and/or video. The interface  403  may comprise the display  403 B configured to display a user interface. The display  403 B may comprise a touch sensitive surface. A user interface comprises one or more user interface objects. A user interface may be referred to as a user interface screen. 
     The display  403 B may be configured to detect touch (e.g. the display is a touch-sensitive display), the input comprises a contact on the touch sensitive display. A touch-sensitive display provides an input interface and an output interface between the accessory device and a user. The processor  402  of the accessory device may be configured to receive and/or send electrical signals from/to touch-sensitive display. A touch-sensitive display is configured to display visual output to the user. The visual output optionally includes graphics, text, icons, video, and any combination thereof (collectively termed “graphics”). For example, some or all of the visual output may be seen as corresponding to user interface objects. 
     In one or more exemplary accessory devices, to communicate the first indication comprises to display, on a visual interface (e.g. a display  403 B) of the accessory device, a user interface comprising a user interface object representative of the first indication, such as a first user interface object representative of the first indication indicative of the quality of the connection and/or representative of a first operating state of the personal care appliance, and/or representative of a second operating state of the personal care appliance. In one or more exemplary accessory devices, the user interface object representative of the first indication comprises a first user interface object representative of the first indication, and/or of one or more operating states. 
     In one or more exemplary accessory devices, to communicate the first indication comprises to notify the user via the interface, such as by displaying a notification on a display of the accessory device. The notification may comprise the first user interface object representative of the first indication. The notification may comprise a notification indicator to open an application related to the personal care appliance. The accessory device  400  may be configured to detect an input on the notification indicator. The accessory device  400  may be configured to, in response to the input, opening the application related to the ostomy appliance. The accessory device  400  may be configured to, in response to the opening of the application, to display a user interface object representative of an operating state (such as a latest operating state and/or an estimated operating state). 
     In one or more exemplary accessory devices, the processor  402  is configured to determine that a secondary criterion based on the quality of the connection is satisfied. For example, the secondary criterion based on a quality of the connection is satisfied when it is determined that the quality of the connection is above a secondary connection threshold. In one or more embodiments, the primary connection threshold is the same as the secondary connection threshold. In one or more embodiments, the primary connection threshold is different from the secondary connection threshold. It may be appreciated that having the primary connection threshold different from the secondary connection threshold may lead to a reduction of the hysteresis effect between the communication of the first indication and the communication of the second indication. 
     In one or more exemplary accessory devices, the processor  402  is configured to in accordance with a determination that the secondary criterion is satisfied, communicate (e.g. via the interface  403 ) a second indication indicative of the quality of the connection. In one or more exemplary accessory devices, the processor  402  is configured to in accordance with a determination that the secondary criterion is satisfied, determine the second indication. In one or more exemplary accessory devices, the second indication is indicative of the operating state at a time where the secondary criterion based on a quality of the connection is satisfied. For example, the first indication is indicative of the operating state at a time where the connection is lost and/or degraded and/or interrupted. 
     In one or more exemplary accessory devices, the processor  402  is configured to, in accordance with a determination that the secondary criterion is satisfied, resume (e.g. using the interface  403 , such as using the transceiver  403 A) reception of the monitor data from the monitor device. For example, the monitor data comprises one or more of: monitor data accumulated during a period of lost connection, e.g. primary monitor data and/or secondary monitor data, until resumption of connection, and real-time monitor data (e.g. “live” monitor data, e.g. monitor data received from resumption of connection). 
     In one or more exemplary accessory devices, the processor  402  is configured to, in accordance with a determination that the secondary criterion is satisfied, communicate the second indication indicative of the quality of the connection, by displaying, on the display of the accessory device, a second user interface object representative of the second indication. For example, the second user interface objection may convey: “something happened” or “everything is still good” (etc.) during the period of lost connection. For example, the processor  402  is configured to notify the user via the interface  403 , such as by displaying a notification indicative of the second indication on the display  403 B. 
     The memory  401  may be configured to store the monitor data and/or the operating state and/or the first indication(s) and/or second indication(s). 
     The processor  402  is optionally configured to perform any of the operations disclosed in  FIGS.  5 A and  5 B . 
     The processor  402  may be optionally configured to perform any of the operations disclosed in  FIG.  5    (such as any one or more of S 509 , S 509 A, A 509 AA, S 511 , S 510 A, S 512 , S 513 , S 514 , S 516 , S 518 , S 518 A). The operations of the accessory device  400  may be embodied in the form of executable logic routines (such as, lines of code, software programs, etc.) that are stored on a non-transitory computer readable medium (such as, the memory  401 ) and are executed by the processor  402 ). 
     Furthermore, the operations of the accessory device  400  may be considered a method that the accessory device  400  is configured to carry out. Also, while the described functions and operations may be implemented in software, such functionality may as well be carried out via dedicated hardware or firmware, or some combination of hardware, firmware and/or software. 
     The memory  401  may be one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, a random access memory (RAM), or other suitable device. In a typical arrangement, the memory  401  may include a non-volatile memory for long term data storage and a volatile memory that functions as system memory for the processor  402 . The memory  401  may exchange data with the processor  402  over a data bus. Control lines and an address bus between the memory  401  and the processor  402  also may be present (not shown in  FIG.  4   ). The memory  401  is considered a non-transitory computer readable medium. 
       FIGS.  5 A and  5 B  shows a flow diagram of an example method  500  of operating an accessory device for a personal care system. The personal care system comprises a personal care appliance, a monitor device, and the accessory device. 
     The method  500  comprises establishing S 502  a connection between the monitor device and the accessory device. The method  500  comprises receiving S 504  monitor data from the monitor device. The method  500  optionally comprises determining S 506  an operating state of the personal care appliance based on the monitor data. 
     The method  500  comprises determining S 508  whether a primary criterion C_ 1  based on a quality of the connection, such as based on a signal strength indicator e.g. a received signal strength indicator (RSSI) or a received channel power indicator (RCPI), is satisfied. Determining S 506  an operating state of the personal care appliance based on the monitor data may be performed in accordance a determination that the primary criterion is satisfied. 
     The method  500  comprises, in accordance with a determination that the primary criterion is not satisfied, communicating S 510  a first indication indicative of the quality of the connection. 
     The method  500  may comprise, in accordance with a determination that the primary criterion is satisfied, refraining S 511  from communicating the first indication indicative of the quality of the connection. 
     In one or more exemplary methods, the primary criterion based on a quality of the connection is not satisfied when it is determined that the quality of the connection is not above a primary connection threshold. For example, the primary criterion based on a quality of the connection is not satisfied when it is determined that the quality of the connection is equal or below the primary connection threshold. 
     For example, the primary criterion, also denoted C_ 1 , may be based on one or more connection parameters associated with the connection and being indicative of a quality of the connection, such as a signal strength indicator, e.g. a received signal strength indicator (RSSI) or a received channel power indicator (RCPI), signal-to-noise ratio, an error rate, e.g. a bit error rate, and/or a frame error rate, a number of non-acknowledgements (NACKs), and/or a number of retransmissions. In other words, the accessory device may be configured to determine whether the connection to the monitor device is lost by determining whether the primary criterion based on the quality of the connection is satisfied. Stated differently, the primary criterion based on a quality of the connection is not satisfied when it is determined that the quality of the connection is degraded (e.g. poor) and/or reduced, leading to a loss of connection to the monitor device. Thus, the accessory device is configured to communicate the first indication in case the connection to the monitor device is of low quality, e.g. lost or degraded. 
     In one or more exemplary methods, the method  500  comprises, in accordance with a determination that the primary criterion is not satisfied, selecting S 509 , from a plurality of indications, the first indication indicative of the quality of the connection. For example, the first indication may be selected from the plurality of indications comprising an indication indicative of the connection lost and/or degraded, and an indication is indicative of the operating state at a time where the primary criterion based on the quality of the connection is not satisfied. 
     In one or more exemplary methods, the method  500  comprises communicating S 510  the first indication indicative of the quality of the connection in accordance with a determination that the primary criterion is not satisfied comprises displaying S 510 A, on a display of the accessory device, a first user interface object representative of the first indication. 
     In one or more exemplary methods, selecting S 509  the first indication indicative of the quality of the connection comprises determining S 509 A an estimated operating state of the personal care appliance based on one or more previous operating states of the personal care appliance. 
     In one or more exemplary methods, determining S 509 A the estimated operating state of the personal care appliance based on the one or more previous operating states of the personal care appliance comprises predicting S 509 AA the estimated operating state of the personal care appliance based on the one or more previous operating states of the personal care appliance. 
     In one or more exemplary methods, the first indication is indicative of the estimated operating state. 
     In one or more exemplary methods, the first indication is indicative of the operating state at a time where the primary criterion based on a quality of the connection is not satisfied. 
     In one or more exemplary methods, the first indication is indicative of the estimated operating state. 
     In one or more exemplary methods, the first indication is indicative of a time since the primary criterion based on a quality of the connection was not satisfied and/or a time where the primary criterion based on a quality of the connection was not satisfied. 
     In one or more exemplary methods, the method comprises determining S 512  whether a secondary criterion C_ 2  based on the quality of the connection is satisfied. The secondary criterion being satisfied may indicate that the connection is resumed and/or returns to a satisfactory quality. For example, the secondary criterion, also denoted C_ 2 , may be based on a connection parameter, CP, associated with the connection and being indicative of a quality of the connection. The secondary criterion C_ 2  may be given as: C_ 2 : CP&gt;TH_C_ 2 , wherein CP is the connection parameter being a signal strength indicator, such as a received signal strength indicator (RSSI) or a received channel power indicator (RCPI), and TH_C_ 2  is a secondary connection threshold. 
     In one or more exemplary methods, the method comprises, in accordance with a determination that the secondary criterion is satisfied, communicating S 514  a second indication indicative of the quality of the connection. 
     The method  500  may comprise, in accordance with a determination that the primary criterion is satisfied, refraining S 513  from communicating the second indication indicative of the quality of the connection. 
     In one or more exemplary methods, the second indication is indicative of the operating state at a time where the secondary criterion based on the quality of the connection is satisfied. 
     In one or more exemplary methods, the method comprises resuming reception S 516  of the monitor data from the monitor device in accordance with a determination that the secondary criterion is satisfied. 
     In one or more exemplary methods, after resuming the reception of monitor data, the method proceeds to S 504 A receiving primary monitor data and/or secondary monitor data from the monitor device. 
     In one or more exemplary methods, in accordance with a determination that the secondary criterion is satisfied, communicating S 514  the second indication indicative of the quality of the connection comprises displaying S 514 A, on the display of the accessory device, a second user interface object representative of the second indication. 
       FIG.  6    illustrates one or more exemplary user interfaces for communicating the first indication according to the present disclosure.  FIG.  6    shows an exemplary user interface  600  for communicating the first indication via a visual interface of the accessory device, such as a display of the accessory device. 
     The user interface  600  comprises a first user interface object  610  representative of the first indication indicative of the quality of connection between the monitor device and the accessory device. The first user interface object  610  may be displayed as one or more media, such as text, graphic and/or video. 
     The first user interface object  610  may be user-interactive, or selectable by a user input. For example, an image (e.g., icon), a button, and text (e.g., hyperlink) each optionally constitute the first user interface object  610 . The first user interface object  610  may form part of a widget. 
     The user interface  600  may comprise one or more, such as a plurality of user interface objects. For example, the user interface may comprise a first primary user interface object  612  representative of the first indication indicative of an operating state at the time of connection loss. For example, the user interface may comprise a first secondary user interface object  614  representative of the first indication indicative of an estimated operating state 
     The accessory device is optionally configured to change dynamically the visual appearance of any of the user interface objects  610 ,  612 ,  614  based on the operating state. e.g. in terms of text, colour, shape, form, contrast, brightness, animation and/or blurring to indicate the operating state (latest or estimated for current time). For example, the severity of the operating state may be displayed, by the accessory device, by varying in colour: e.g. blue, yellow, red for indicating low, medium, high severity respectively. For example, the severity of the operating state may be displayed, by the accessory device, by varying shades within a colour from a lighter shade to a darker shade for indicating low to high severity respectively. For example, the severity of the operating state may be displayed, by the accessory device, by varying a magnitude of the visual effect (e.g., less blurring, sharper contrast) as severity increases. 
     For example, the user interface object  610  and/or  612 , and/or  614  may be representative of an operating state indicating to change NOW the personal care by adopting e.g. the colour red, in a dark shade, in sharp contrast. 
     In one or more exemplary user interfaces, the user interface  600  comprises user interface objects  610 ,  612 ,  614  which separately or together, display a text prompt indicating to the user the first indication. A text prompt may for example indicate: “Monitor connection lost—Everything is fine”, “Monitor connection lost—Good”, “Monitor connection lost—Check”, “Monitor connection lost—Change”. 
     For example, the user interface object  610  and/or  612 , and/or  614  may be displayed as one or more notifications, such as in a notification centre displayed on the display. 
     The accessory device may be configured to provide the user interface  600  in a user application running on the processor. The user application may be a dedicated personal care application that assist the user in monitoring the internal operating state of the personal care appliance. 
     The accessory device may be configured to provide the user interface  600  on a lock screen displayed by the accessory device. 
     The accessory device may be configured to provide the user interface  600  on a home screen displayed by the accessory device. 
       FIG.  7    shows an exemplary user interface  700  for communicating the second indication via a visual interface of the accessory device, such as a display of the accessory device. 
     The user interface  700  comprises a second user interface object  710  representative of the second indication indicative of the quality of connection between the monitor device and the accessory device. The second user interface object  710  may be displayed as one or more media, such as text, graphic and/or video. 
     The second user interface object  710  may be user-interactive, or selectable by a user input. For example, an image (e.g., icon), a button, and text (e.g., hyperlink) each optionally constitute the second user interface object  710 . The second user interface object  710  may form part of a widget. 
     The user interface  700  may comprise one or more, such as a plurality of user interface objects. For example, the user interface may comprise a second primary user interface object  712  representative of the second indication indicative of an operating state at the time of connection resumed (at a time where the secondary criterion based on a quality of the connection is satisfied). 
     The accessory device is configured to change dynamically the visual appearance of any of the user interface object  712  based on the operating state. e.g. in terms of colour, shape, form, contrast, brightness, animation and/or blurring to indicate the operating state (latest or estimated for current time). For example, the severity of the operating state may be displayed, by the accessory device, by varying in colour: e.g. blue, yellow, red for indicating low, medium, high severity respectively. For example, the severity of the operating state may be displayed, by the accessory device, by varying shades within a colour from a lighter shade to a darker shade for indicating low to high severity respectively. For example, the severity of the operating state may be displayed, by the accessory device, by varying a magnitude of the visual effect (e.g., less blurring, sharper contrast) as severity increases. 
     For example, the user interface object  710  and/or  712 , may be representative of an operating state indicating to change NOW the personal care by adopting e.g. the colour red, in a dark shade, in sharp contrast. 
     In one or more exemplary user interfaces, the user interface  700  comprises user interface objects  710 ,  712  which separately or together, display a text prompt indicating to the user the second indication. A text prompt may for example indicate: “Monitor connection resumed—Everything is fine”, “Monitor connection resumed—Good”, “Monitor connection resumed—Check”, “Monitor connection resumed—Change”. 
     For example, the user interface object  710  and/or  712 , may be displayed as one or more notifications, such as in a notification centre displayed on the display. 
     The accessory device may be configured to provide the user interface  700  in the user application running on the processor dedicated to personal care. 
     The accessory device may be configured to provide the user interface  700  on a lock screen displayed by the accessory device. 
       FIG.  8    illustrates an exemplary personal care system  1  embodied as a wound dressing system  1 B. The personal care system  1  (wound dressing system  1 B) comprises a personal care appliance  2  embodied as a wound dressing  2 B. Further, the personal care system  1  comprises a monitor device  6  and an accessory device  8  (mobile telephone, smartphone). The monitor device  6  is connectable to the personal care appliance  2 , such as to wound dressing  2 B and/or to an electrode assembly of or mounted to the wound dressing, via respective first connectors of the monitor device  6  and wound dressing  2 B/electrode assembly. 
     The use of the terms “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. does not imply any particular order, but are included to identify individual elements. Moreover, the use of the terms “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. does not denote any order or importance, but rather the terms “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. are used to distinguish one element from another. Note that the words “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. are used here and elsewhere for labelling purposes only and are not intended to denote any specific spatial or temporal ordering. 
     Furthermore, the labelling of a first element does not imply the presence of a second element and vice versa. 
     It may be appreciated that  FIGS.  1 - 8    comprise some modules or operations which are illustrated with a solid line and some modules or operations which are illustrated with a dashed line. The modules or operations which are comprised in a solid line are modules or operations which are comprised in the broadest example embodiment. The modules or operations which are comprised in a dashed line are example embodiments which may be comprised in, or a part of, or are further modules or operations which may be taken in addition to the modules or operations of the solid line example embodiments. It should be appreciated that these operations need not be performed in order presented. Furthermore, it should be appreciated that not all of the operations need to be performed. The exemplary operations may be performed in any order and in any combination. 
     It is to be noted that the word “comprising” does not necessarily exclude the presence of other elements or steps than those listed. 
     It is to be noted that the words “a” or “an” preceding an element do not exclude the presence of a plurality of such elements. 
     It should further be noted that any reference signs do not limit the scope of the claims, that the exemplary embodiments may be implemented at least in part by means of both hardware and software, and that several “means”, “units” or “devices” may be represented by the same item of hardware. 
     The various exemplary methods, devices, and systems described herein are described in the general context of method steps processes, which may be implemented in one aspect by a computer program product, embodied in a computer-readable medium, including computer-executable instructions, such as program code, executed by computers in networked environments. A computer-readable medium may include removable and nonremovable storage devices including, but not limited to, Read Only Memory (ROM), Random Access Memory (RAM), compact discs (CDs), digital versatile discs (DVD), etc. Generally, program modules may include routines, programs, objects, components, data structures, etc. that perform specified tasks or implement specific abstract data types. Computer-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes. 
     Although features have been shown and described, it will be understood that they are not intended to limit the claimed invention, and it will be made obvious to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the claimed invention. The specification and drawings are, accordingly to be regarded in an illustrative rather than restrictive sense. The claimed invention is intended to cover all alternatives, modifications, and equivalents. 
     LIST OF REFERENCES 
     
         
           1  personal care system 
           1 A ostomy system 
           1 B wound dressing system 
           2  personal care appliance 
           2 A ostomy appliance 
           2 B wound dressing appliance 
           4  base plate 
           6  monitor device 
           8  accessory device 
           9  connection 
           10  server device 
           12  network 
           14  coupling member 
           16  coupling ring 
           18  stoma-receiving opening 
           19  center of the opening 
           20  docking station 
           22  first connector 
           24  user interface 
           100  monitor device housing 
           101  processor 
           102  first interface 
           104  second interface 
           106 ,  106 A memory 
           108  ground terminal of monitor device 
           110  first terminal of monitor device 
           112  second terminal of monitor device 
           114  third terminal of monitor device 
           116  fourth terminal of monitor device 
           118  fifth terminal of monitor device 
           120  coupling part 
           121  power unit 
           122  antenna 
           124  wireless transceiver, transceiver module 
           126  loudspeaker 
           128  haptic feedback element 
           140  sensor unit 
           142 , MD_ 1  primary monitor data 
           144 , MD_ 2  secondary monitor data 
           300  method of operating a monitor device for a personal care system 
         S 302  establishing a connection between the monitor device and at least one of the one or more accessory devices 
         S 304  transmitting monitor data to the accessory device via the connection 
         S 304 A transmitting monitor data, such as primary monitor data and/or secondary monitor data, in the memory to the accessory device 
         S 304 B storing monitor data in the memory according to a transmit storing scheme 
         S 308  determining whether a primary storing criterion based on a quality of the connection is satisfied 
         S 310  storing primary monitor data in the memory according to a primary storing scheme 
         S 312  selecting the primary storing scheme from a plurality of storing schemes 
         S 314  determining whether a secondary storing criterion is satisfied 
         S 316  storing secondary monitor data in the memory according to a secondary storing scheme 
         S 316 A compressing primary monitor data in the memory. 
         S 316 B deleting primary monitor data or at least a part thereof from the memory 
         S 317  selecting the secondary storing scheme from a plurality of storing schemes 
         S 318  determining whether a transmission criterion based on the quality of the connection is satisfied 
           400  accessory device 
           401  memory of accessory device 
           402  processor of accessory device 
           403  interface of accessory device 
           403  transceiver 
           403 B display 
           500  Method of operating an accessory device 
         S 502  establishing a connection between the monitor device and the accessory device. 
         S 504  receiving monitor data from the monitor device 
         S 504 A receiving primary monitor data and/or secondary monitor data from the monitor device 
         S 506  determining an operating state of the personal care appliance based on the monitor data. 
         S 508  determining whether a primary criterion based on a quality of the connection is satisfied. 
         S 509  selecting, from a plurality of indications, the first indication indicative of the quality of the connection 
         S 509 A determining the estimated operating state of the personal care appliance based on the one or more previous operating states of the personal care appliance 
         S 509 AA predicting the estimated operating state of the personal care appliance based on the one or more previous operating states of the personal care appliance 
         S 510  communicating a first indication indicative of the quality of the connection 
         S 511  refraining from communicating the first indication indicative of the quality of the connection 
         S 512  determining whether a secondary criterion based on the quality of the connection is satisfied 
         S 513  refraining from communicating the second indication indicative of the quality of the connection 
         S 514  communicating a second indication indicative of the quality of the connection 
         S 514 A displaying, on the display of the accessory device, a second user interface object representative of the second indication 
         S 516  resuming reception of monitor data from the monitor device in accordance with a determination that the secondary criterion is satisfied 
           600  user interface 
           610  first user interface object 
           612  first primary user interface object 
           614  first secondary user interface object 
           700  user interface 
           710  second user interface object 
           712  second primary user interface object