Patent Publication Number: US-2023146436-A1

Title: Personal care system with monitor device 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 a plurality of accessory devices including a primary accessory device and a secondary accessory device. In particular, the present disclosure relates to operation of a monitor device and accessory device in scenarios where one or more connections are lost or degraded. 
    
    
     
       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 secondary accessory device according to the present disclosure, 
         FIGS.  5 A and  5 B  show a flow diagram of an example method of operating a secondary accessory device for a personal care system according to the present disclosure, 
         FIG.  6    shows one or more exemplary user interfaces for communicating the secondary indication according to the present disclosure, 
         FIG.  7    shows one or more exemplary user interfaces for communicating the tertiary indication according to the present disclosure, 
         FIG.  8    illustrates an exemplary personal care system being a wound dressing system, and 
         FIG.  9    is a block diagram illustrating an exemplary primary accessory device according to the present disclosure. 
     
    
    
     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, an 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 monitor device and/or the primary accessory device are configured to establish a primary connection therebetween. The primary connection may be a Bluetooth connection or other wireless connection. The monitor device and/or the secondary accessory device are configured to establish a secondary connection therebetween. The secondary connection may be a Bluetooth connection or other wireless connection. The primary accessory device and/or the secondary accessory device are optionally configured to establish an accessory connection therebetween. The accessory connection may be a Bluetooth connection or other wireless connection. 
     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, a primary accessory device, and a secondary accessory device 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 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 is disclosed, the personal care system comprising a personal care appliance, the monitor device, a primary accessory device, and a secondary accessory device, 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 primary accessory device and/or the secondary accessory device. The monitor device is configured to establish a primary connection between the monitor device and the primary accessory device; transmit primary monitor data to the primary accessory device via the primary connection; determine whether a first primary connection criterion based on a quality of the primary connection is satisfied; and in accordance with a determination that the first primary connection criterion is not satisfied, transmit secondary monitor data, e.g. to the secondary accessory device. 
     Monitor data, such as the primary monitor data and/or the secondary 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 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 and/or electrode assembly of the wound dressing appliance. Accordingly, the primary monitor data may comprise primary appliance data and/or the secondary monitor data may comprise secondary appliance 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 (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 (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 (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 (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 (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 first primary connection criterion based on a quality of the primary connection is not satisfied when it is determined that the quality of the primary connection is not above a first primary connection threshold. 
     The first primary connection criterion not being satisfied may indicate that the primary connection is lost or that the primary connection has a low quality or does not have a satisfactory quality to transmit primary monitor data to the primary accessory device. In other words, the monitor device is optionally configured to transmit secondary monitor data upon determination of no or low-quality primary connection to the primary accessory device. For example, the first primary connection criterion, also denoted CC_1_1, may be based on a first primary connection parameter, CP_1_1, associated with the primary connection and being indicative of a quality of the primary connection. 
     The first primary connection criterion CC_1_1 may be given as: 
       CC_1_1: CP_1_1&gt;TH_C_1_1, 
     wherein CP_1_1 is the first primary connection parameter and TH_C_1_1_is a first primary connection threshold. The first primary connection parameter CP_1_1 may be a signal strength indicator, such as a received signal strength indicator (RSSI) or a received channel power indicator (RCPI). The first primary connection parameter CP_1_1 may be a signal-to-noise ratio. 
     The first primary connection criterion CC_1_1 may be given as: 
       CC_1_1: CP_1_1&lt;TH_C_1_1, 
     wherein CP_1_1 is the first primary connection parameter indicative of errors in the primary 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_1 is a first primary connection threshold. 
     In one or more exemplary monitor devices, to determine whether a first primary connection criterion, e.g. based on a quality of the primary connection, is satisfied may comprise to determine or obtain a first primary connection parameter, CP_1_1, e.g. based on one or more connection parameters, and to compare the first primary connection parameter with a first primary connection threshold TH_C_1_1. 
     The first 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 first primary connection criterion is not satisfied, the monitor device does not transmit primary monitor data any longer or forgo to transmit primary monitor data to the primary accessory device. In other words, the monitor device may be configured to determine whether the primary connection to the primary accessory device is lost by determining whether the first primary connection criterion based on the quality of the primary connection is satisfied. Stated differently, the first primary connection criterion based on a quality of the primary connection is not satisfied when it is determined that the quality of the primary connection is degraded (e.g. poor) and/or reduced, leading to a loss of primary connection to the primary accessory device. Thus, the monitor device is configured to transmit secondary monitor data in case the primary connection to the primary 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 first primary connection criterion is not satisfied, determine the secondary monitor data. The secondary monitor data may be indicative of the primary connection being lost and/or degraded. 
     In one or more exemplary monitor devices, the monitor device is configured to, in accordance with a determination that the first primary connection criterion is not satisfied, forgo to transmit primary monitor data to the primary accessory device. 
     In one or more exemplary monitor devices, the monitor device is configured to, in accordance with a determination that the first primary connection criterion is not satisfied, establish a secondary connection to the secondary accessory device, wherein the secondary monitor data are transmitted via the secondary connection. To establish a secondary connection may comprise to activate an idle or inactive secondary connection. 
     In one or more exemplary monitor devices, the monitor device is configured to, in accordance with a determination that the first primary connection criterion is not satisfied, determine the secondary monitor data. For example, a processing, power, and/or memory capability of the secondary accessory device may be less than a processing, power, and/or memory capability of the primary accessory device, such that the secondary monitor data may need to be less/simpler than the primary monitor data. 
     The primary monitor data transmitted to the primary accessory device may comprise appliance data that are not transmitted to the secondary accessory device, i.e. the primary monitor data may comprise appliance data, such as one or more of second appliance data, third appliance data, fourth appliance data, and fifth 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 primary monitor data transmitted to the primary accessory device may not be part of secondary monitor data transmitted to the secondary accessory device. Accordingly, the secondary monitor data may be a reduced data set compared to the primary monitor data that are transmitted to the primary accessory device via the primary connection. Thereby, optimum or improved usage of possible limited capacity in the secondary accessory 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. 
     In one or more exemplary monitor devices, to determine the secondary monitor data is based on a type of the secondary accessory device, such as a smartphone, smartwatch, or tablet. Thereby, the monitor device may be able to customize the secondary monitor data transmitted to the secondary accessory device, such as by taking into account processing, power, and/or memory capabilities of the secondary accessory device. Thus, the monitor device is able to optimize transmission of monitor data. 
     In one or more exemplary monitor devices, to determine the secondary monitor data comprises selecting first secondary monitor data as the secondary monitor data in accordance with the secondary accessory device being a first type and selecting second secondary monitor data as the secondary monitor data in accordance with the secondary accessory device being a second type. The first secondary monitor data may be different from the second secondary monitor data. For example, the first secondary monitor data may be larger than and/or transmitted at higher frequency than the second secondary monitor, e.g. in case the first type is a smartphone and the second type is a smartwatch. 
     The monitor device may be configured to transmit the primary monitor data according to a primary transmission scheme and to transmit the secondary monitor data according to a secondary transmission scheme. The primary transmission scheme may be different from the secondary transmission scheme. 
     In one or more exemplary monitor devices, the first transmission scheme comprises a first transmission parameter. In one or more exemplary monitor devices, the second transmission scheme comprises a second transmission parameter. In one or more exemplary monitor devices, the first transmission parameter and the second transmission parameter are different. A transmission parameter may comprise a transmission frequency, a transmission periodicity, a transmission signal phase, a transmission power, a transmission radio frequency, a transmission protocol (e.g. Bluetooth, Bluetooth Low Energy, ZigBee, WLAN, cellular protocol) and/or any combination thereof. 
     In one or more exemplary monitor devices, to determine the secondary monitor data 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 first secondary monitor data as the secondary monitor data, while a second operating state, e.g. requiring no or little attention, may trigger selection of second secondary monitor data as the secondary monitor data, wherein the first secondary monitor data has larger size and/or frequency than the second secondary monitor data. 
     In one or more exemplary monitor devices, the monitor device is configured to determine whether a second primary connection criterion based on a quality of the primary connection is satisfied. In accordance with a determination that the second primary connection criterion is satisfied, the monitor device is optionally configured to resume to transmit primary monitor data to the primary accessory device. In one or more exemplary monitor devices, the monitor device is configured to, in accordance with a determination that the second primary connection criterion is satisfied, notify the secondary accessory device that the primary connection has been resumed/re-established, e.g. by including a primary connection notifier in the secondary monitor data. 
     In one or more exemplary monitor devices, the second primary connection criterion based on a quality of the primary connection is satisfied when it is determined that the quality of the primary connection is above a second primary connection threshold or when it is determined that the primary connection is resumed. 
     In one or more exemplary monitor devices, the monitor device is configured to, in accordance with a determination that the second primary connection criterion is satisfied, forgo to transmit secondary monitor data to the secondary accessory device and/or one or more of terminate, idle or inactivate the secondary connection. 
     The second primary connection criterion being satisfied may indicate that the primary connection is resumed or that the primary connection has a satisfactory quality to transmit primary monitor data to the primary accessory device. In other words, the monitor device is optionally configured to transmit primary monitor data upon determination of resumed primary connection to the primary accessory device. For example, the second primary connection criterion, also denoted CC_1_2, may be based on a second primary connection parameter, CP_1_2, associated with the primary connection and being indicative of a quality of the primary connection. 
     The second primary connection criterion CC_1_2 may be given as: 
       CC_1_2: CP_1_2&gt;TH_C_1_2, 
     wherein CP_1_2 is the second primary connection parameter and TH_C_1_2_is a second primary connection threshold. The second primary connection parameter CP_1_2 may be a signal strength indicator, such as a received signal strength indicator (RSSI) or a received channel power indicator (RCPI). The second primary connection parameter CP_1_2 may be a signal-to-noise ratio. 
     The second primary connection criterion CC_1_2 may be given as: 
       CC_1_2: CP_1_2&lt;TH_C_1_2, 
     wherein CP_1_2 is the second primary connection parameter indicative of errors in the primary 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_2 is a second primary connection threshold. 
     In one or more exemplary monitor devices, to determine whether a second primary connection criterion, e.g. based on a quality of the primary connection, is satisfied may comprise to determine or obtain a second primary connection parameter, CP_1_2, e.g. based on one or more connection parameters, and to compare the second primary connection parameter with a second primary connection threshold TH_C_1_2. 
     The second 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 second primary connection criterion is satisfied, the monitor device does not transmit secondary monitor data any longer or forgoes to transmit secondary monitor data to the secondary accessory device. In other words, the monitor device may be configured to determine whether the primary connection to the primary accessory device is resumed or increased in quality by determining whether the second primary connection criterion based on the quality of the primary connection is satisfied. For example, the second primary connection criterion based on a quality of the primary connection is not satisfied when it is determined that the quality of the primary connection remains lost, degraded (e.g. poor) and/or reduced. 
     In one or more exemplary monitor devices, the primary monitor data comprises primary appliance data, such as primary ostomy data obtained from an ostomy appliance being the personal care appliance via the first interface. In one or more exemplary monitor devices, the secondary monitor data comprises secondary appliance data, such as secondary ostomy data obtained from an ostomy appliance being the personal care appliance via the first interface. 
     In one or more exemplary monitor devices, the primary monitor data comprises primary appliance data, such as 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, such as secondary wound dressing data obtained from a wound dressing being the personal care appliance via the first interface. The secondary monitor data may be the same as the primary monitor data, i.e. the secondary monitor data may have the same configuration as the primary monitor data. 
     The monitor device may be configured to transmit secondary monitor data via a network to a sink device, such as a server device or the primary accessory device. The network may be a multi-hop network, such as a mesh network. For example, the monitor device may be configured to transmit secondary monitor data via one or more relay devices, such as beacons or electronic devices configured to act as a relay. 
     The monitor device may be configured, in accordance with a determination that the first primary connection criterion is not 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 primary monitor data in the memory according to the primary storing scheme. The primary storing scheme may define a primary data size of primary monitor data stored in a storing operation in the memory according to the primary storing scheme. 
     In one or more exemplary monitor devices, the monitor device is configured to, in accordance with a determination that the first primary connection criterion is not satisfied, select or determine the primary storing scheme, e.g. 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. 
     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 transmitted to the secondary accessory device. 
     Further, a method of operating a monitor device for a personal care system comprising a personal care appliance, the monitor device, a primary accessory device, and a secondary accessory device 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 primary accessory device and/or the secondary accessory device, the method comprising establishing a primary connection between the monitor device and the primary accessory device; transmitting primary monitor data to the primary accessory device via the primary connection; determining whether a first primary connection criterion based on a quality of the primary connection is satisfied; and in accordance with a determination that the first primary connection criterion is not satisfied, transmitting secondary monitor data, e.g. to the secondary accessory device. 
     In one or more methods of operating a monitor device, the first primary connection criterion is not satisfied when determining that the quality of the primary connection is not above a first primary connection threshold. 
     In one or more methods of operating a monitor device, the method comprises, in accordance with a determination that the first primary connection criterion is not satisfied, forgo transmitting primary monitor data to the primary accessory device. 
     In one or more methods of operating a monitor device, the method comprises, in accordance with a determination that the first primary connection criterion is not satisfied, establishing a secondary connection to the secondary accessory device, wherein the secondary monitor data are transmitted via the secondary connection. 
     In one or more methods of operating a monitor device, the method comprises, in accordance with a determination that the first primary connection criterion is not satisfied, determining the secondary monitor data. 
     In one or more methods of operating a monitor device, determining the secondary monitor data is based on a type of the secondary accessory device. 
     In one or more methods of operating a monitor device, determining the secondary monitor data comprises selecting first secondary monitor data as the secondary monitor data in accordance with the secondary accessory device being a first type and selecting second secondary monitor data as the secondary monitor data in accordance with the secondary accessory device being a second type. 
     In one or more methods of operating a monitor device, determining the secondary monitor data is based on an operating state of the personal care appliance. 
     In one or more methods of operating a monitor device, the method comprises determining whether a second primary connection criterion based on a quality of the primary connection is satisfied; and in accordance with a determination that the second primary connection criterion is satisfied, resume transmitting primary monitor data to the primary accessory device. 
     In one or more methods of operating a monitor device, the second primary connection criterion based on a quality of the primary connection is satisfied when it is determined that the quality of the primary connection is above a second primary connection threshold or when it is determined that the primary connection is resumed. 
     In one or more methods of operating a monitor device, the method comprises, in accordance with a determination that the second primary connection criterion is satisfied, forgo transmitting secondary monitor data to the secondary accessory device. 
     In one or more methods of operating a monitor device, the personal care appliance is an ostomy appliance, and the method comprising obtaining ostomy data from the ostomy appliance and including the ostomy data in the primary monitor data and/or in the secondary monitor data. 
     In one or more methods of operating a monitor device, the personal care appliance is a wound dressing, and the method comprising obtaining wound dressing data from the wound dressing and including the wound dressing data in the primary monitor data and/or in the secondary monitor data. 
     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. 
     In one or more exemplary methods of operating a monitor device, the method comprises, in accordance with a determination that the first primary connection criterion is not 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, the method comprising, in accordance with a determination that the first primary connection criterion is not satisfied, selecting or determining the primary storing scheme, e.g. from a plurality of storing schemes. 
     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. 
     The present disclosure provides an accessory device (primary accessory device) for a personal care system, the personal care system comprising a personal care appliance, a monitor device, a primary accessory device, and a secondary accessory device, wherein the accessory device is configured as the primary accessory device, the primary accessory device comprising a processor; a memory connected to the processor; and an interface configured to connect the primary accessory device to the monitor device of the personal care system, the interface comprising a transceiver module connected to the processor, wherein the primary accessory device is configured to establish a primary connection between the monitor device and the primary accessory device; receive primary monitor data from the monitor device; optionally establish an accessory connection between the primary accessory device and the secondary accessory device; and determine whether a first primary connection criterion based on a quality of the primary connection is satisfied. The primary accessory device is optionally configured to, in accordance with a determination that the first primary connection criterion is not satisfied, receive secondary accessory data from the secondary accessory device; and/or communicate or transmit a primary indication, e.g. included in primary accessory data to the secondary accessory device. 
     The primary accessory device is optionally configured to, in accordance with a determination that the first primary connection criterion is not satisfied, transmit primary accessory data to the secondary accessory device. Thereby the primary accessory device may be configured to inform the secondary accessory device on historical monitor data and/or current or previous operating states of the personal care appliance, in turn enabling the secondary accessory device more precise operating state determinations and/or secondary indications. 
     Also disclosed is an accessory device (secondary accessory device) for a personal care system, the personal care system comprising a personal care appliance, a monitor device, a primary accessory device, and a secondary accessory device, wherein the accessory device is configured as the secondary accessory device, the secondary accessory device comprising a processor; a memory connected to the processor; and an interface configured to connect the secondary accessory device to the monitor device of the personal care system, the interface comprising a transceiver module connected to the processor, wherein the secondary accessory device is configured to establish a secondary connection between the monitor device and the secondary accessory device; receive, from the monitor device, secondary monitor data, indicative of a primary connection between the monitor device and the primary accessory device; and optionally communicate a secondary indication based on the secondary monitor data. 
     The secondary monitor data may be indicative of a primary connection between the monitor device and the primary accessory device being lost or degraded. 
     In one or more (secondary) accessory devices, the secondary indication is indicative of a first primary connection criterion not being satisfied in the monitor device and/or in the primary accessory device. 
     In one or more exemplary secondary accessory devices, the secondary accessory device is configured to select, from a plurality of indications, the secondary indication indicative of the quality of the primary connection. In one or more exemplary secondary accessory devices, the secondary indication is indicative of the operating state at a time where the monitor device and/or the primary accessory device determines that a primary criterion based on the quality of the primary connection is not satisfied. For example, the secondary indication may be indicative of the operating state at a time where the primary connection is lost and/or degraded and/or interrupted. The secondary accessory device is optionally configured to, e.g. in accordance with receiving secondary monitor data indicative of the primary connection being lost or degraded, determine, such as select, obtain, and/or generate, the secondary indication indicative of the quality of the primary connection. For example, the secondary indication may be indicative of the operating state of the personal care appliance at a time where the primary connection is lost and/or degraded and/or interrupted. 
     In one or more (secondary) accessory devices, the secondary accessory device is configured to determine an operating state of the personal care appliance based on the secondary monitor data, and wherein the secondary indication is based on the operating state. 
     In one or more (secondary) accessory devices, the secondary accessory device is configured to establish an accessory connection between the primary accessory device and the secondary accessory device; receive primary accessory data from the primary accessory device; and determine the secondary indication based on the primary accessory data. 
     For example, the secondary accessory device is configured to, e.g. based on the secondary monitor data and/or primary accessory data, communicate the secondary indication, e.g. to the user, e.g. via an output device (such as a display and/or a loudspeaker) of the secondary accessory device. In one or more exemplary embodiments, the secondary indication may be communicated by sound. 
     In one or more (secondary) accessory devices, the secondary accessory device is configured to establish an accessory connection between the primary accessory device and the secondary accessory device; and transmit secondary accessory data to the primary accessory device. The secondary accessory data may be based on or include the secondary monitor data and/or the secondary indication. The secondary accessory device may be configured to transmit secondary accessory data to the primary accessory device directly and/or via a network. The network may be a multi-hop network, such as a mesh network. For example, the secondary accessory device may be configured to transmit secondary accessory data via one or more relay devices, such as beacons or electronic devices configured to act as a relay. 
     In one or more (secondary) accessory devices, the secondary accessory device is configured to, in accordance with a determination that a primary connection between the monitor device and the primary accessory device has been resumed, forgo to receive secondary monitor data from the monitor device. Accordingly, the secondary accessory device may be configured to determine whether a primary connection between the monitor device and the primary accessory device has been resumed/re-established, e.g. based on the secondary monitor data and/or based on primary accessory data. 
     The secondary accessory device may be configured to store the secondary monitor data, and, e.g. in accordance with establishing an accessory connection between the primary accessory device and the secondary accessory device, include the secondary monitor data in secondary accessory data and transmit the secondary accessory data including the secondary monitor data to the primary accessory device. Accordingly, the secondary accessory device may be configured to determine whether an accessory connection between the primary accessory device and the secondary accessory device has been established. Thereby, the secondary accessory device may function as a storage and/or relay device to ensure that essential system data, such as appliance data, are not lost in case of a lost primary connection. Such functionality may in particular be useful in cases where the processing resources of the secondary accessory device are limited, e.g. in a scenario where the secondary accessory device is a smartwatch having less processing resources than the primary accessory device, e.g. being a smartphone. 
     In one or more (secondary) accessory devices and/or methods of operating a secondary accessory device, the secondary accessory device is a smartphone. 
     In one or more (secondary) accessory devices and/or methods of operating a secondary accessory device, the secondary accessory device is a smartwatch. 
     In one or more (secondary) accessory devices and/or methods of operating a secondary accessory device, the secondary accessory device is a tablet. 
     The secondary accessory device may be configured to determine an operating state of the personal care appliance based on the secondary monitor data. The secondary accessory device may be configured to determine the secondary indication based on the operating state of the personal appliance. The secondary accessory device may be configured to include operating state(s) determined based on the secondary monitor data in the secondary accessory data. 
     The disclosed secondary accessory device is capable of determining and/or communicating a secondary indication indicative of a quality of a primary connection between the monitor device and the primary accessory device. The present disclosure improves the reliability of the monitoring performed by the personal care system, by communicating the secondary indication indicative of the quality of primary connection when a quality of the primary connection is not satisfactory. This permits to notify appropriately the user about missing primary connection and activate or utilize the secondary accessory device in the monitoring of the personal care appliance. 
     For example, communication of the second indication indicative of a quality of the primary connection to the monitor device assists the user in monitoring the personal care appliance by informing the user that the primary accessory device is not active and/or that the secondary accessory device has taken over monitoring the personal care appliance, in turn providing a reliable and secure monitoring of the personal care appliance and operating state thereof. Thus, the present disclosure 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 or 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/or communication of the second indication indicative of an estimated operating state, and possibly with a latest operating state, according to the present disclosure is performed based on secondary monitor data and/or primary accessory data indicative of a condition of the personal care 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. In particular, a user is informed about non-presence of the primary accessory device and is able to act accordingly, e.g. by accepting use of the secondary accessory device or returning to be within range of the primary accessory device. 
     For example, the primary accessory device may be configured to, in accordance with a determination that the first primary connection criterion is not satisfied, communicate the secondary indication to the secondary accessory device as primary accessory data. 
     In one or more exemplary primary accessory devices, the first primary connection 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 first primary connection threshold. 
     In one or more exemplary secondary accessory devices, to select the secondary indication indicative of the quality of the primary connection optionally comprises to determine an estimated operating state of the personal care appliance, e.g. based on one or more previous operating states of the personal care appliance as indicated by primary accessory data received from the primary accessory device.. The one or more previous operating states of the personal care appliance are determined and optionally transmitted by the primary accessory device before the time where the first primary connection criterion based on the quality of the connection is not satisfied (e.g. before the time where the primary connection is lost). 
     In one or more exemplary secondary 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 secondary accessory devices, the secondary indication is indicative of the estimated operating state. 
     The processor of the secondary accessory device 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 primary accessory device (i.e. prior to loss/degradation of connection). 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 secondary 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 primary accessory device and/or the secondary accessory device. 
     It may be envisaged that the processor of the secondary 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 secondary 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 secondary 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 secondary accessory device may be configured to predict (such as to determine) the estimated operating state based on secondary monitor data obtained for similar product types of personal care appliances previously used by the user. 
     In one or more exemplary accessory devices, the secondary accessory device is configured to, in accordance with a determination that the primary connection has been lost or degraded , communicate the secondary indication indicative of the quality of the connection, by displaying, on a display of the secondary accessory device, a first user interface object representative of the secondary indication. The secondary user interface object may be displayed as one or more media, such as text, graphic and/or video. 
     The secondary 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 secondary 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 secondary 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 secondary 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 secondary accessory devices, to communicate the secondary 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 secondary indication, such as a first user interface object representative of the secondary indication indicative of the quality of the primary 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 secondary accessory devices, the first user interface object representative of the secondary indication comprises a first primary user interface object representative of the secondary indication, and/or a first primary user interface object representative of one or more operating states. 
     For example, the first user interface object may comprise one or more visual indicators representative of the secondary 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 secondary accessory devices, to communicate the secondary 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 secondary indication. The notification may comprise a notification indicator to open an application related to the personal care appliance. The secondary accessory device may be configured to detect an input on the notification indicator. The secondary accessory device may be configured to, in response to the input, opening the application related to the personal care appliance. The secondary 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). For example, the first user interface object may convey: “Connection to primary accessory device lost” and/or “everything is good”. 
     In one or more exemplary secondary accessory devices, the secondary accessory device is configured to determine whether the primary connection has been resumed/re-established, e.g. based on the secondary monitor data and/or primary accessory data. 
     In one or more exemplary secondary accessory devices, the secondary accessory device is configured to in accordance with a determination that the primary connection is resumed or has increased quality, communicate a tertiary indication indicative of the quality of the primary connection. In one or more exemplary secondary accessory devices, the secondary accessory device is configured to in accordance with a determination that the primary connection has been resumed, determine the tertiary indication. 
     The secondary accessory device is optionally configured to, in accordance with a determination that the primary connection is resumed or has increased quality, determine, such as select, obtain, and/or generate, the tertiary indication indicative of the quality of the primary connection. For example, the tertiary indication may be indicative of an operating state based on secondary monitor data received from the monitor device at the time that the primary connection has been resumed, such as based on secondary monitor data stored in the monitor device. 
     In one or more exemplary secondary accessory devices, the tertiary indication is indicative of the operating state at a time where the primary connection is resumed or has increased quality. For example, the tertiary indication may be indicative of the operating state at a time where the primary connection is resumed, such as re-established. 
     In one or more exemplary secondary accessory devices, the secondary monitor data comprises 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 secondary accessory devices, the secondary accessory device is configured to, in accordance with a determination that the primary connection is resumed or has increased quality, communicate the tertiary indication indicative of the quality of the primary connection, by displaying, on the display of the accessory device, a second user interface object representative of the tertiary indication. For example, the second user interface object may convey: “Connection to primary accessory device resumed” and/or “everything is still good”. For example, to communicate the tertiary indication may comprise to notify the user via the interface, such as by displaying a notification indicative of the tertiary indication on a display of the secondary accessory device. 
     The present disclosure provides a method of operating a secondary accessory device for a personal care system. The personal care system comprises a personal care appliance, a monitor device, a primary accessory device, and the secondary accessory device. The method comprises establishing a secondary connection between the monitor device and the secondary accessory device. The method comprises receiving secondary monitor data from the monitor device. The method optionally comprises determining an operating state of the personal care appliance based on the secondary monitor data. The method comprises communicating a secondary indication based on the secondary monitor data and optionally indicative of the quality of the primary connection, such as indicative of a first primary connection criterion not being satisfied in the monitor device and/or in the primary accessory device. 
     In one or more exemplary methods of operating a secondary accessory device, the method comprises selecting, from a plurality of indications, the secondary indication indicative of the quality of the primary connection. 
     In one or more exemplary methods of operating a secondary accessory device, communicating the secondary indication indicative of the quality of the primary connection comprises displaying, on a display of the accessory device, a first user interface object representative of the secondary indication. 
     In one or more exemplary methods of operating a secondary accessory device, selecting the secondary indication indicative of the quality of the primary 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 a secondary 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 a secondary accessory device, the secondary indication is indicative of the operating state at a time where the primary connection is lost or degraded. 
     In one or more exemplary methods of operating a secondary accessory device, the secondary indication is indicative of the estimated operating state. 
     In one or more exemplary methods of operating a secondary accessory device, the method comprises determining whether the primary connection has been resumed or re-established, e.g. based on the secondary monitor data and/primary accessory data. 
     In one or more exemplary methods of operating a secondary accessory device, the method comprises, in accordance with a determination that the primary connection has been resumed or re-established, communicating a tertiary indication indicative of the quality of the primary connection. 
     In one or more exemplary methods of operating a secondary accessory device, the tertiary indication is indicative of the operating state at a time where the primary connection has been resumed or re-established. For example, the tertiary indication is optionally indicative of the operating state at a time where the primary connection is resumed, such as re-established. 
     In one or more exemplary methods of operating a secondary accessory device, the secondary monitor data comprises 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 a secondary accessory device, communicating the tertiary 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 tertiary indication. 
     Is to be noted that descriptions of the secondary accessory device being configured to perform acts also apply to the corresponding acts in the method of operating a secondary 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 a secondary accessory device with an interface, a memory and a processor cause the accessory device to perform any of the methods of operating a secondary 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 , a primary accessory device  8 A (mobile telephone, smartphone), and a secondary accessory device  8 B (smartwatch). 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  2 , 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 primary connection  9 A with the primary accessory device  8 A and via secondary connection  9 B with the secondary accessory device  8 B. Optionally, the primary accessory device  8 A and/or secondary accessory device  8 B are configured to communicate with a server device  10  of the personal care system  1 , e.g. via network  12 . The primary accessory device  8 A and the secondary accessory device  8 B may be wirelessly connected via accessory connection  9 C. The primary accessory device  8 A and the secondary accessory device  8 B may be wirelessly connected 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 primary monitor data that are transmitted to the primary accessory device  8 A via primary connection  9 A and/or secondary monitor data that are transmitted to the secondary accessory device  8 B via secondary connection  9 B. In the illustrated personal care system, the primary accessory device  8 A is a mobile phone, however the primary accessory device  8 A 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. In the illustrated personal care system, the secondary accessory device  8 B is a smartwatch, however the secondary accessory device  8 B may be embodied as another handheld device, such as a tablet device, smartphone, or a wearable, such as a watch or other wrist-worn electronic device. Accordingly, the monitor device  6  is configured to determine primary monitor data and transmit the primary monitor data to the primary accessory device  8 A and/or determine secondary monitor data and transmit the secondary monitor data to the secondary accessory device  8 B. 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. 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, see  FIG.  8   . 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 primary accessory device  8 A and secondary accessory device  8 B. 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  8 A,  8 B 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 primary connection between the monitor device and the primary accessory device; transmit primary monitor data MD_ 1  to the primary accessory device via the primary connection; determine whether a first primary connection criterion based on a quality of the primary connection is satisfied; and in accordance with a determination that the first primary connection criterion is not satisfied, transmit secondary monitor data MD_ 2  to the secondary accessory device. The monitor device may be configured to store the primary monitor data  142  in the memory  106 . 
     The first primary connection criterion CC_1_1 may be given as: 
       CC_1_1: CP_1_1&gt;TH_C_1_1, 
     wherein CP_1_1 is the first primary connection parameter and TH_C_1_1_is a first primary connection threshold. The first primary connection parameter CP_1_1 may be a signal strength indicator, such as a received signal strength indicator (RSSI) or a received channel power indicator (RCPI). The first primary connection parameter CP_1_1 may be a signal-to-noise ratio. In other words, the first primary connection criterion based on a quality of the primary connection is not satisfied when it is determined that the quality of the primary connection is not above a first primary connection threshold. 
     The monitor device/processor  101  is optionally configured to, in accordance with a determination that the first primary connection criterion is not satisfied, forgo to transmit primary monitor data to the primary accessory device 
     The monitor device  6  is optionally configured to, in accordance with a determination that the first primary connection criterion is not satisfied, establish a secondary connection to the secondary accessory device, wherein the secondary monitor data MD_ 2  are transmitted via the secondary connection. To establish a secondary connection may comprise to activate an idle or inactive secondary connection. 
     The monitor device  6  is optionally configured to, in accordance with a determination that the first primary connection criterion is not satisfied, determine the secondary monitor data MD_ 2 . For example, a processing, power, and/or memory capability of the secondary accessory device may be less than a processing, power, and/or memory capability of the primary accessory device, such that the secondary monitor data may need to be less/simpler than the primary monitor data. The secondary monitor data may correspond to the primary monitor data, e.g. if the primary accessory device and the secondary accessory device are both smartphones having similar processing, power, and/or memory capabilities. 
     The primary monitor data transmitted to the primary accessory device may comprise appliance data that are not transmitted to the secondary accessory device, i.e. the primary monitor data may comprise appliance data, such as one or more of second appliance data, third appliance data, fourth appliance data, and fifth 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 primary monitor data transmitted to the primary accessory device may not be part of secondary monitor data transmitted to the secondary accessory device. Accordingly, the secondary monitor data may be a reduced data set compared to the primary monitor data that are transmitted to the primary accessory device via the primary connection. Thereby, optimum or improved usage of possible limited capacity in the secondary accessory 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. 
     In monitor device  6 , to determine the secondary monitor data is optionally based on a type of the secondary accessory device, such as a smartphone, smartwatch, or tablet. Thereby, the monitor device  6  may be able to customize the secondary monitor data transmitted to the secondary accessory device, such as by taking into account processing, power, and/or memory capabilities of the secondary accessory device. Thus, the monitor device  6  is able to optimize transmission of monitor data. 
     The monitor device  6 /processor  101  is optionally configured to determine whether a second primary connection criterion based on a quality of the primary connection is satisfied. In accordance with a determination that the second primary connection criterion is satisfied, the monitor device is optionally configured to resume to transmit primary monitor data to the primary accessory device. In one or more exemplary monitor devices, the monitor device is configured to, in accordance with a determination that the second primary connection criterion is satisfied, notify the secondary accessory device that the primary connection has been resumed/re-established, e.g. by including a primary connection notifier in the secondary monitor date. The second primary connection criterion based on a quality of the primary connection may be satisfied when it is determined that the quality of the primary connection is above a second primary connection threshold or when it is determined that the primary connection is resumed. 
     The monitor device  6 /processor  101  is optionally configured to, in accordance with a determination that the second primary connection criterion is satisfied, forgo to transmit secondary monitor data to the secondary accessory device and/or one or more of terminate, idle or inactivate the secondary connection. Thereby a power-efficient monitor device is provided. 
     The second primary connection criterion being satisfied may indicate that the primary connection is resumed or that the primary connection has a satisfactory quality to transmit primary monitor data to the primary accessory device. In other words, the monitor device is optionally configured to transmit primary monitor data upon determination of resumed primary connection to the primary accessory device. For example, the second primary connection criterion, also denoted CC_1_2, may be based on a second primary connection parameter, CP_1_2, associated with the primary connection and being indicative of a quality of the primary connection. 
     The second primary connection criterion CC_1_2 may be given as: 
       CC_1_2: CP_1_2 &gt;TH_C_1_2, 
     wherein CP_1_2 is the second primary connection parameter and TH_C_1_2_is a second primary connection threshold. The second primary connection parameter CP_1_2 may be a signal strength indicator, such as a received signal strength indicator (RSSI) or a received channel power indicator (RCPI). The second primary connection parameter CP_1_2 may be a signal-to-noise ratio. 
     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 primary monitor data and/or secondary monitor data, based on the appliance data and optionally in accordance with a respective transmission 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 ). The operations of the accessory 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 primary connection between the monitor device and the primary accessory device; optionally transmitting S 304  primary monitor data MD_ 1  to the primary accessory device via the primary connection, determining S 308  whether a first primary connection criterion CC_1_1 based on a quality of the primary connection is satisfied; and in accordance with a determination that the first primary connection criterion CC_1_1 is not satisfied, transmitting S 310  secondary monitor data to the secondary accessory device. 
     In method  300 , the act of determining S 308  whether the first primary connection criterion CC_1_1 based on a quality of the primary connection is satisfied optionally comprises determining whether the quality of the connection is above a threshold, e.g. wherein the first primary connection criterion CC_1_1 may be given as: CC_1_1: CP_1_1&gt;TH_C_1_1, wherein CP_1_1 is the first primary connection parameter being a signal strength indicator, such as a received signal strength indicator (RSSI) or a received channel power indicator (RCPI), or a signal-to-noise ratio, and TH_C_1_1_is a first primary connection threshold. 
     The method  300  comprises, in accordance with a determination that the first primary connection criterion CC_1_1 is not satisfied, establishing S 311  a secondary connection to the secondary accessory device, wherein the secondary monitor data MD_ 2  are transmitted via the secondary connection. 
     The method  300  optionally comprises, in accordance with a determination that the first primary connection criterion CC_1_1 is not satisfied, determining S 312  the secondary monitor data MD_ 2 . The secondary monitor data MD_ 2  may be indicative of the primary connection being lost and/or degraded. The method  300  optionally comprises, in accordance with a determination that the first primary connection criterion CC_1_1 is satisfied, proceeding to transmitting S 304  primary monitor data MD_ 1  to the primary accessory device via the primary connection. 
     The method  300  optionally comprises, in accordance with a determination that the first primary connection criterion CC_1_1 is not satisfied, forgo S 313  transmitting primary monitor data MD_ 1  to the primary accessory device. 
     The method  300  optionally comprises determining S 314  whether a second primary connection criterion CC_1_2 based on a quality of the primary connection is satisfied. 
     The method  300  optionally comprises, in accordance with a determination that the second primary connection criterion is satisfied, notifying S 316  the secondary accessory device that the primary connection has been resumed/re-established, e.g. by including a primary connection notifier in the secondary monitor date. 
     The method optionally comprises, in accordance with a determination that the second primary connection criterion is satisfied, forgo S 318  transmitting secondary monitor data MD_ 2  to the secondary accessory device. 
     In accordance with a determination that the second primary connection criterion is satisfied, the method  300  optionally comprises resuming transmitting S 304  primary monitor data MD_ 1  to the primary accessory device. 
       FIG.  4    is a block diagram illustrating an exemplary secondary accessory device  400 ,  8 B according to the present disclosure. The secondary 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 secondary 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 secondary 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, optionally a primary accessory 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 secondary connection between the monitor device and the secondary accessory device. 
     The interface  403  is configured to receive secondary monitor data from the monitor device, such as to receive or retrieve the secondary monitor data from the one or more devices. The secondary monitor data may be indicative of a primary connection between the monitor device and the primary accessory device and/or 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 secondary accessory devices, the secondary 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  is configured to determine and/or communicate a secondary indication based on the secondary monitor data. The secondary monitor data may be indicative of a primary connection between the monitor device and the primary accessory device being lost or degraded. 
     The secondary accessory device/processor  402  is optionally configured to select, from a plurality of indications, the secondary indication indicative of the quality of the primary connection. In one or more exemplary secondary accessory devices, the secondary indication is indicative of the operating state at a time where the monitor device and/or the primary accessory device determines that a first primary criterion based on the quality of the primary connection is not satisfied. For example, the secondary indication may be indicative of the operating state at a time where the primary connection is lost and/or degraded and/or interrupted. The secondary accessory device is optionally configured to, e.g. in accordance with receiving secondary monitor data indicative of the primary connection being lost or degraded, determine, such as select, obtain, and/or generate, the secondary indication indicative of the quality of the primary connection. For example, the secondary indication may be indicative of the operating state of the personal care appliance at a time where the primary connection is lost and/or degraded and/or interrupted. 
     The processor  402  may be configured to determine an operating state of the personal care appliance based on the secondary monitor data. 
     The accessory device  400  is capable of communicating a secondary indication indicative of a quality of the primary connection. The present disclosure improves the reliability of the monitoring performed by the personal care system, by communicating the secondary indication indicative of the quality of primary connection when a quality of the primary connection is not satisfactory, e.g. as indicated by the secondary monitor data. The secondary accessory device  400  can notify appropriately the user and to start potentially determining or estimating the operating state based on the secondary monitor data. For example, communication of the secondary indication indicative of a quality of the primary 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 secondary indication indicative of an estimated operating state, and possibly with a latest operating state, according to the present disclosure is performed based on secondary monitor data indicative of a condition of the personal care appliance which may not be visible to the user. 
     The secondary accessory device is configured to, e.g. based on the secondary monitor data and/or primary accessory data, communicate the secondary indication, e.g. to the user, e.g. via an output device (such as a display and/or a loudspeaker) of the secondary accessory device. In one or more exemplary embodiments, the secondary indication may be communicated by sound. 
     The secondary accessory device  400  is optionally configured to establish an accessory connection between the primary accessory device and the secondary accessory device; receive primary accessory data from the primary accessory device; and determine the secondary indication based on the primary accessory data. 
     The processor  402  is optionally configured to, in accordance with a determination that the quality of primary connection is not satisfactory, select, from a plurality of indications, the secondary indication indicative of the quality of the primary connection. In one or more exemplary accessory devices, the second indication is indicative of the operating state at a time where the quality of the primary connection is not satisfactory. For example, the secondary indication may be indicative of the operating state at a time where the primary connection is lost and/or degraded and/or interrupted. For example, the secondary indication may be selected from the plurality of indications comprising an indication indicative of the primary connection lost and/or degraded, and an indication indicative of the operating state at a time where the quality of the primary connection is not satisfactory. 
     To select the secondary indication indicative of the quality of the primary connection may comprise 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 secondary 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 secondary accessory device before the time where the quality of the connection is not satisfactory (e.g. before the time where the primary connection is lost). In one or more exemplary secondary accessory devices, the secondary indication is indicative of the estimated operating state. 
     In one or more exemplary secondary accessory devices, the processor  402  is configured to, in accordance with a determination that the quality of the primary connection is not satisfactory, e.g. the primary connection is lost, communicate, e.g. via the interface  403 , the secondary indication indicative of the quality of the primary connection, by displaying, on a display  403 B, a first user interface object representative of the secondary 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 secondary accessory devices, to communicate the secondary 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 secondary indication, such as a first user interface object representative of the secondary indication indicative of the quality of the primary 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 secondary indication comprises a first user interface object representative of the secondary indication, and/or of one or more operating states. 
     In one or more exemplary secondary accessory devices, to communicate the secondary indication comprises to notify the user via the interface, such as by displaying a notification on a display of the secondary accessory device  400 . The notification may comprise the first user interface object representative of the secondary indication. The notification may comprise a notification indicator to open an application related to the personal care appliance. The secondary accessory device  400  may be configured to detect an input on the notification indicator. The secondary accessory device  400  may be configured to, in response to the input, opening the application related to the personal care appliance. The secondary 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). For example, the first user interface object may convey: “Connection to primary accessory device lost” and/or “everything is good”. 
     The secondary accessory device  400  may be configured to determine whether the primary connection has been resumed/re-established, e.g. based on the secondary monitor data from the monitor device and/or primary accessory data from the primary accessory device. 
     The secondary accessory device  400  may be configured to, in accordance with a determination that the primary connection is resumed or has increased quality, communicate a tertiary indication indicative of the quality of the primary connection. The secondary accessory device  400  may be configured to in accordance with a determination that the primary connection has been resumed, determine the tertiary indication. 
     The secondary accessory device  400  is optionally configured to, in accordance with a determination that the primary connection is resumed or has increased quality, determine, such as select, obtain, and/or generate, the tertiary indication indicative of the quality of the primary connection. For example, the tertiary indication may be indicative of an operating state based on secondary monitor data received from the monitor device at the time that the primary connection has been resumed, such as based on secondary monitor data stored in the monitor device. 
     The tertiary indication is optionally indicative of the operating state at a time where the primary connection is resumed or has increased quality. For example, the tertiary indication may be indicative of the operating state at a time where the primary connection is resumed, such as re-established. 
     The secondary monitor data may comprise 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. 
     The secondary accessory device  400  may be configured to, in accordance with a determination that the primary connection is resumed or has increased quality, communicate the tertiary indication indicative of the quality of the primary connection, by displaying, on the display of the accessory device, a second user interface object representative of the tertiary indication. For example, the second user interface object may convey: “Connection to primary accessory device resumed” and/or “everything is still good”. For example, to communicate the tertiary indication may comprise to notify the user via the interface, such as by displaying a notification indicative of the tertiary indication on a display of the secondary accessory device. 
     The memory  401  may be configured to store the secondary monitor data and/or the operating state and/or the secondary indication(s) and/or tertiary 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 506 , S 508 , S 509 , S 509 A,  509 AA, S 510 , S 512 , S 512 A, S 514 , S 516 ). The operations of the secondary 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 secondary accessory device  400  may be considered a method that the secondary 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 a secondary accessory device for a personal care system. The personal care system comprises a personal care appliance, a monitor device, a primary accessory device, and the secondary accessory device. 
     The method  500  of operating a secondary accessory device for a personal care system comprises establishing S 502  a secondary connection between the monitor device and the secondary accessory device, receiving S 504  secondary monitor data from the monitor device. Receiving S 504  secondary monitor data from the monitor device optionally comprises storing S 504 A the secondary monitor data in the memory. The method optionally comprises determining S 506  an operating state of the personal care appliance based on the secondary monitor data MD_ 2 . The method  500  comprises communicating S 508  a secondary indication based on the secondary monitor data and optionally indicative of the quality of the primary connection, such as indicative of a first primary connection criterion not being satisfied in the monitor device and/or in the primary accessory device. 
     The method  500  optionally comprises selecting S 509 , from a plurality of indications, the secondary indication indicative of the quality of the primary connection. 
     In the method  500 , communicating S 508  the secondary indication indicative of the quality of the primary connection comprises displaying S 508 A, on a display of the secondary accessory device, a first user interface object representative of the secondary indication. 
     In the method  500 , selecting S 509  the secondary indication indicative of the quality of the primary connection optionally 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. 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 may comprise 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. The secondary indication may be indicative of the operating state at a time where the primary connection is lost or degraded. The secondary indication is optionally indicative of the estimated operating state. 
     The method  500  may comprise determining S 510  whether the primary connection has been resumed or re-established, e.g. based on the secondary monitor data and/primary accessory data. The method  500  optionally comprises, in accordance with a determination that the primary connection has been resumed or re-established, communicating S 512  a tertiary indication indicative of the quality of the primary connection. The tertiary indication may be indicative of the operating state at a time where the primary connection has been resumed or re-established. For example, the tertiary indication is optionally indicative of the operating state at a time where the primary connection is resumed, such as re-established. Communicating S 512  the tertiary indication indicative of the quality of the connection optionally comprises displaying S 512 A, on the display of the accessory device, a second user interface object representative of the tertiary indication. The method  500  optionally comprises, in accordance with a determination that the primary connection has been resumed or re-established, forgo S 514  receiving the secondary monitor data and/or transmitting S 516  secondary monitor data stored in memory of the secondary accessory device to the primary accessory device. 
       FIG.  6    illustrates one or more exemplary user interfaces for communicating the secondary indication according to the present disclosure.  FIG.  6    shows an exemplary user interface  600  for communicating the secondary indication via a visual interface of the accessory device, such as a display of the secondary accessory device. 
     The user interface  600  comprises a first user interface object  610  representative of the secondary indication indicative of the quality of primary connection between the monitor device and the primary 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 comprise the text “Connection to primary device lost”. 
     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 secondary indication indicative of an operating state at the time of primary connection loss. For example, the user interface may comprise a first secondary user interface object  614  representative of the secondary 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 secondary 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 of the personal care appliance 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 secondary 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 secondary indication. A text prompt may for example indicate: “Primary connection lost—Everything is fine”, “Primary connection lost—Good”, “Primary connection lost—Check”, “Primary 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 secondary 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 secondary accessory device may be configured to provide the user interface  600  on a lock screen displayed by the secondary accessory device. 
     The secondary accessory device may be configured to provide the user interface  600  on a home screen displayed by the secondary accessory device. 
       FIG.  7    shows an exemplary user interface  700  for communicating the tertiary indication via a visual interface of the accessory device, such as a display of the secondary accessory device. 
     The user interface  700  comprises a second user interface object  710  representative of the tertiary indication indicative of the quality of primary connection between the monitor device and the primary 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 second primary connection criterion based on a quality of the primary connection is satisfied). 
     The secondary accessory device is optionally configured to change dynamically the visual appearance of any of the user interface object  712  based on the operating state of the personal care appliance, 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 secondary 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 secondary 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 secondary 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 tertiary indication. A text prompt may for example indicate: “Primary connection resumed—Everything is fine”, “Primary connection resumed—Good”, “Primary connection resumed—Check”, “Primary 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 secondary accessory device. 
     The secondary accessory device may be configured to provide the user interface  600  on a home screen or a clock face displayed by the secondary 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 appliance  2 B. 
       FIG.  9    is a block diagram illustrating an exemplary primary accessory device  900 ,  8 A according to the present disclosure. The primary accessory device  900  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 primary accessory device  900  comprises a memory  901 ; a processor  902  coupled to the memory  901 ; and an interface  903 , coupled to the processor  902 . 
     Peripheral devices, such as memory  901  and/or interface  903  can be operatively and communicably coupled to the processor  902  via a bus for communicating data. The processor  902  can be a central processing unit (CPU), but other suitable microprocessors are also contemplated. 
     The interface  903  is configured to connect the secondary accessory device to the monitor device of the personal care system, the interface comprising a transceiver module  903 A connected to the processor  902 . 
     The interface  903  may be configured to communicate with one or more devices of the personal care system. The one or more devices comprising a monitor device, optionally a secondary accessory 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  903  may comprise a display  903 B as a visual interface to the user. The interface  903  is configured to establish a primary connection between the monitor device and the primary accessory device. 
     The interface  903  is configured to receive primary monitor data from the monitor device, such as to receive or retrieve the primary monitor data from the one or more devices. 
     The interface  903  is configured to establish an accessory connection between the primary accessory device and the secondary accessory device. 
     The primary accessory device  900 /processor  902  is configured to, determine whether a first primary connection criterion based on a quality of the primary connection is satisfied; and in accordance with a determination that the first primary connection criterion is not satisfied receive secondary accessory data from the secondary accessory device; and/or communicate a primary indication to the secondary accessory device, e.g. by transmitting primary accessory data to the secondary accessory device. The primary accessory data may comprise previously received primary monitor data and/or previously determined operating states of the personal care appliance, such as base plate. The primary indication may be indicative of loss of primary connection. The secondary accessory data may comprise secondary monitor data and/or operating states of the personal care appliance, such as base plate, determined by the secondary accessory device. 
     The primary accessory device  900  is optionally configured to, in accordance with a determination that the first primary connection criterion is not satisfied, transmit primary accessory data to the secondary accessory device. Thereby the primary accessory device may be configured to inform the secondary accessory device on historical monitor data and/or current or previous operating states of the personal care appliance, in turn enabling the secondary accessory device more precise operating state determinations and/or secondary indications. 
     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 - 9    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 non-removable 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 A primary accessory device, smartphone 
       8 B secondary accessory device, smartwatch 
       9 A primary connection between the monitor device and the primary accessory device 
       9 B secondary connection between the monitor device and the secondary accessory device 
       9 C accessory connection between the primary accessory device and the secondary accessory device 
       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 primary connection between the monitor device and the primary accessory device 
     S 304  transmitting primary monitor data to the primary accessory device via the primary connection 
     S 308  determining whether a first primary connection criterion based on a quality of the primary connection is satisfied 
     S 310  transmitting secondary monitor data to the secondary accessory device 
     S 311  establishing a secondary connection between the monitor device and the secondary accessory device 
     S 312  determining the secondary monitor data 
     S 313  forgo transmitting primary monitor data 
     S 314  determining whether a second primary connection criterion is satisfied 
     S 316  notifying the secondary accessory device 
     S 318  forgo transmitting the secondary monitor data 
       400  secondary 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 a secondary accessory device 
     S 502  establishing a secondary connection between the monitor device and the secondary accessory device 
     S 504  receiving secondary monitor data from the monitor device 
     S 504 A storing secondary monitor data in memory 
     S 506  determining an operating state of the personal care appliance based on the secondary monitor data 
     S 508  communicating a secondary indication indicative of the quality of the primary connection 
     S 509  selecting, from a plurality of indications, the secondary 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  determining whether a quality of the primary connection is satisfactory 
     S 512  communicating a tertiary indication indicative of the quality of the primary connection 
     S 512 A displaying, on the display of the secondary accessory device, a second user interface object representative of the second indication 
     S 514  forgo receiving secondary monitor data 
     S 516  transmitting the secondary monitor data stored in the memory 
       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 
       900  secondary accessory device 
       901  memory of accessory device 
       902  processor of accessory device 
       903  interface of accessory device 
       903  transceiver 
       903 B display