Patent Publication Number: US-2021162120-A1

Title: Delivery device with noise reducing component

Description:
This application is a continuation application of U.S. Ser. No. 16/035,215, filed on Jul. 13, 2018, which claims priority to U.S. Provisional Patent Application No. 62/533,276 filed on Jul. 17, 2017, which are hereby incorporated by reference in their entireties. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to a delivery device for a medication, and more particularly, to medical delivery devices and apparatus with a dispensing mechanism having a vibration and/or noise reducing component. 
     BACKGROUND 
     Diabetes is a group of diseases characterized by high levels of blood glucose resulting from the inability of diabetic patients to maintain proper levels of insulin production when required. Persons with diabetes will require some form of daily insulin therapy to maintain control of their glucose levels. Diabetes can be dangerous to the affected patient if it is not treated, and it can lead to serious health complications and premature death. However, such complications can be minimized by utilizing one or more treatment options to help control the diabetes and reduce the risk of complications. 
     The treatment options for diabetic patients include specialized diets, oral medications and/or insulin therapy. The main goal of diabetes treatment is to control the diabetic patient&#39;s blood glucose or sugar level. However, maintaining proper diabetes management may be complicated because it has to be balanced with the activities of the diabetic patient. 
     For the treatment of type  1  diabetes, there are two principal methods of daily insulin therapy. In the first method, diabetic patients use syringes or insulin pens to self-inject insulin when needed. This method requires a needle stick for each injection, and the diabetic patient may require three to four injections daily. The syringes and insulin pens that are used to inject insulin are relatively simple to use and cost effective. 
     Another effective method for insulin therapy and managing diabetes is infusion therapy or infusion pump therapy in which an insulin pump is used. The insulin pump can provide continuous infusion of insulin to a diabetic patient at varying rates in order to more closely match the functions and behavior of a properly operating pancreas of a non-diabetic person that produces the required insulin, and the insulin pump can help the diabetic patient maintain his/her blood glucose level within target ranges based on the diabetic patient&#39;s individual needs. 
     Infusion pump therapy requires an infusion cannula, typically in the form of an infusion needle or a flexible catheter, that pierces the diabetic patient&#39;s skin and through which, infusion of insulin takes place. Infusion pump therapy offers the advantages of continuous infusion of insulin, precision dosing, and programmable delivery schedules. 
     In infusion therapy, insulin doses are typically administered at a basal rate and in a bolus dose. When insulin is administered at a basal rate, insulin is delivered continuously over 24 hours in order to maintain the diabetic patient&#39;s blood glucose levels in a consistent range between meals and rest, typically at nighttime. Insulin pumps may also be capable of programming the basal rate of insulin to vary according to the different times of the day and night. In contrast, a bolus dose is typically administered when a diabetic patient consumes a meal, and generally provides a single additional insulin injection to balance the consumed carbohydrates. Insulin pumps may be configured to enable the diabetic patient to program the volume of the bolus dose in accordance with the size or type of the meal that is consumed by the diabetic patient. In addition, insulin pumps may also be configured to enable the diabetic patient to infuse a correctional or supplemental bolus dose of insulin to compensate for a low blood glucose level at the time when the diabetic patient is calculating the bolus dose for a particular meal that is to be consumed. 
     Insulin pumps advantageously deliver insulin over time rather than in single injections, typically resulting in less variation within the blood glucose range that is recommended. In addition, insulin pumps may reduce the number of needle sticks which the diabetic patient must endure, and improve diabetes management to enhance the diabetic patient&#39;s quality of life. 
     Typically, regardless of whether a diabetic patient uses multiple direct injections (MDIs) or a pump, the diabetic patient takes fasting blood glucose medication (FBGM) upon awakening from sleep, and also tests for glucose in the blood during or after each meal to determine whether a correction dose is required. In addition, the diabetic patient may test for glucose in the blood prior to sleeping to determine whether a correction dose is required, for instance, after eating a snack before sleeping. 
     To facilitate infusion therapy, there are generally two types of insulin pumps, namely, conventional pumps and patch pumps. Conventional pumps require the use of a disposable component, typically referred to as an infusion set, tubing set or pump set, which conveys the insulin from a reservoir within the pump into the skin of the user. The infusion set consists of a pump connector, a length of tubing, and a hub or base from which a cannula, in the form of a hollow metal infusion needle or flexible plastic catheter extends. The base typically has an adhesive that retains the base on the skin surface during use. The cannula can be inserted into the skin manually or with the aid of a manual or automatic insertion device. The insertion device may be a separate unit required by the user. 
     Another type of insulin pump is a patch pump. Unlike a conventional infusion pump and infusion set combination, a patch pump is an integrated device that combines most or all of the fluidic components, including the fluid reservoir, pumping mechanism and mechanism for automatically inserting the cannula, in a single housing which is adhesively attached to an infusion site on the patient&#39;s skin, and does not require the use of a separate infusion or tubing set. A patch pump containing insulin adheres to the skin and delivers the insulin over a period of time via an integrated subcutaneous cannula. Some patch pumps may wirelessly communicate with a separate controller device (as in one device sold by Insulet Corporation under the brand name OmniPod®), while others are completely self-contained. Such devices are replaced on a frequent basis, such as every three days, when the insulin reservoir is exhausted or complications may otherwise occur, such as restriction in the cannula or the infusion site. 
     As patch pumps are designed to be a self-contained unit that is worn by the diabetic patient, it is preferable to be as small as possible so that it does not interfere with the activities of the user. Thus, in order to minimize discomfort to the user, it would be preferable to minimize the overall thickness of the patch pump. However, in order to minimize the thickness of the patch pump, its constituent parts should be reduced as much as possible. One such part is the insertion mechanism for automatically inserting the cannula into the user&#39;s skin. 
     To minimize the height of the insertion mechanism, conventional insertion mechanisms are generally configured to insert the cannula at an acute angle from the surface of the skin, e.g. 30-45 degrees. However, it is generally preferable to insert the cannula perpendicular or close to the perpendicular from the surface of the skin since this would require the minimum length of cannula insertion. In other words, with the minimum length of cannula being inserted into the user&#39;s skin, the user can experience greater comfort and fewer complications, such as premature kinking of the cannula. 
     A common problem or concern with patch pumps and other electrically operated drug delivery devices is the vibration and noise produced during operation of the pump mechanism. The movement of the motor and pump mechanism can result in vibrations that can be perceived by the user when attached to the skin and can produce audible sounds that can be heard by others. 
     Accordingly, a need exists for an improved delivery device for use in a limited space environment, such as in the patch pump, that can reduce the vibration and sounds emitted by the device during use without interfering with the normal operation of the device. 
     SUMMARY 
     One aspect of the present invention is a delivery device, such as a patch pump, catheter device, infusion pump, or other delivery device for delivering a substance to a patient. The substance can be insulin, drugs, or pharmaceutical. The delivery device has movable components and is constructed to reduce or dampen the vibration and/or noise produced by mechanical components of the device during use. The device in one embodiment is a patch pump or other delivery device where the mechanical components of the delivery device that are responsible for producing vibrations and/or noise are isolated or shielded by a noise reducing component. The noise reducing component is a vibration and/or noise dampening member to inhibit vibrations and noise from transferring to the base or housing of the device. In one embodiment the noise dampening member is formed from a noise dampening material positioned between the base and/or housing and the mechanical component of the delivery mechanism. In other embodiments, the noise dampening member can be provided on other locations in or on the base or at selected locations on the inner surface of the housing. The noise dampening member can be oriented on a surface within the cavity formed by the base and cover or on an outer surface of the device in an area to dampen noise from components of the device. 
     The aspects of the present invention are achieved by providing delivery device, such as a catheter delivery device, having a housing, base with a noise reducing component, and mechanical components for delivering the pharmaceutical or drug to a patient through a cannula, where the cannula can be steel cannula or flexible catheter. In one embodiment, the base includes at least one selected area on the top face of the base with a vibration and/or noise dampening material between the base and the mechanical component. The mechanical components of the delivery device are isolated or shielded from the base and housing by the vibration and/or noise dampening material to inhibit vibrations and noise from transferring from the mechanical components to the base or housing. The vibration and/or noise dampening material is oriented and configured to reduce and minimize the perceived noise level and vibration produced by the mechanical components during use. 
     The various aspects of the present invention are also achieved by providing a method of constructing a delivery device by providing a noise reducing component from a vibration and/or noise dampening material between the mechanical components and the base and/or housing of the delivery device. 
     The various aspects of the present invention are also achieved by providing a delivery device such as a catheter delivery device, including a housing and a base coupled to the housing and enclosing mechanical components of the delivery device. The mechanical components can include a pump mechanism and gearbox for operating the pump, and a motor for driving the gear box and pump mechanism. The base is configured for supporting the pump mechanism, a catheter and catheter insertion mechanism, and a drive motor connected to a suitable power source such as a battery for driving the pump mechanism. The base has at least one and typically more than one supporting area for the pump, motor and other moving components of the pump mechanism. A vibration and/or noise dampening material is provided in the supporting area between the base and the mechanical component to dampen vibration and noise through the base and housing. In one embodiment, the vibration and/or noise dampening material can be an elastomeric polymer applied to the supporting area of the base. 
     In one embodiment, the delivery device is a catheter infusion pump assembly having a housing and a base coupled to the housing and defining a cavity. The base has a top face in the cavity and a bottom face. The bottom face is configured for contacting the skin of the patient during use with the catheter inserted into the patient at the infusion site. At least one vibration and noise dampening material is provided in or on the top face of the base. At least one mechanical component of the pump mechanism of the pump assembly is coupled to the top face of the base and can be positioned over or proximate the noise dampening member or spaced from the noise dampening member. The vibration and noise dampening material in one embodiment can be provided in one or more selected locations where the mechanical components of the pump assembly are mounted to absorb vibrations and inhibit vibrations and noise in the base and housing. The vibration and noise dampening member is oriented between the mechanical component and the base. In other embodiments, the noise dampening member can be positioned between the mechanical components and the housing to absorb noise and vibration from the mechanical components. 
     In one embodiment of the invention, the noise dampening member can be a sheet material or a separately formed member that is applied to a surface of the device and attached to the device in a fixed position. The noise dampening member can have a suitable shape and dimension to cover a selected area of the device and can have an adhesive or mastic layer applied to one side for attaching the noise dampening member to the device. The noise dampening member can have a shape and dimension to cover all or a selected portion of the top face of the base or to the cover. The noise dampening member can be attached a suitable surface within the device or on an outer surface of the device. 
     Additional and/or other aspects and advantages of the present invention will be set forth in the description that follows, or will be apparent from the description, or may be learned by practice of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and/or other aspects and advantages of embodiments of the invention will be more readily appreciated from the following detailed description, taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a perspective view of a delivery device shown as a patch pump incorporating a low-profile cannula insertion device, illustrated with a transparent cover for clarity; 
         FIG. 2  is an exploded view of the various components of the delivery device of  FIG. 1 , illustrated with a cover; 
         FIG. 3  is a perspective view of an alternative design for a patch pump having a flexible reservoir, illustrated without a cover; 
         FIG. 4  is a patch-pump fluidic architecture and metering sub-system diagram of the patch pump of  FIG. 3 ; 
         FIG. 5  is perspective view of a delivery device in another embodiment of the invention showing the delivery device including a catheter and insertion needle before being deployed; 
         FIG. 6  is a perspective view of the delivery device of  FIG. 5  showing the catheter deployed for delivering a substance to a patient; 
         FIG. 7  is a top perspective view of the base of a pump assembly in accordance with one embodiment of the delivery device; 
         FIG. 8  is a bottom perspective view of the base of the base of  FIG. 7 ; 
         FIG. 9  is a top perspective view of base of a pump assembly in another embodiment of the invention; 
         FIG. 10  is a bottom perspective view of the base of the pump assembly of  FIG. 9 ; 
         FIG. 11  is top perspective view of the base in cross section showing the noise dampening member; 
         FIG. 12  is a top view of a noise dampening member in another embodiment formed as a separate member that can be attached to the device; 
         FIG. 13  is an end view of the noise dampening member of  FIG. 12 ; 
         FIG. 14  is a top view of a noise dampening member in a further embodiment formed as a separate member that can be attached to the device; and 
         FIG. 15  is an end view of the noise dampening member of  FIG. 14 . 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS OF THE PRESENT INVENTION 
     Reference will now be made in detail to embodiments of the present invention, which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. The embodiments described herein exemplify, but do not limit, the present invention by referring to the drawings. 
     It will be understood by one skilled in the art that this disclosure is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the drawings. The embodiments herein are capable of other embodiments, and capable of being practiced or carried out in various ways. Also, it will be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless limited otherwise, the terms “connected,” “coupled,” and “mounted,” and variations thereof herein are used broadly and encompass direct and indirect connections, couplings, and mountings. In addition, the terms “connected” and “coupled” and variations thereof are not restricted to physical or mechanical connections or couplings. Further, terms such as up, down, bottom, and top are relative, and are employed to aid illustration, but are not limiting. The features discloses in connection with one embodiment can be combined with another embodiment without departing from the scope of the disclosure or the invention. 
       FIG. 1  is a perspective view of an exemplary embodiment of the delivery device shown as an infusion pump or a patch pump  1 . The patch pump  1  is illustrated with a see-through cover for clarity and illustrates various components that are assembled to form the patch pump  1 .  FIG. 2  is an exploded view of the various components of the patch pump of  FIG. 1 , illustrated with a solid cover  2 . The various components of the patch pump  1  may include a reservoir  4  for storing insulin, a pump mechanism  3  having a gearbox for pumping a substance such as insulin from the reservoir  4 , a power source  5  in the form of one or more batteries, an insertion mechanism  7  for inserting an inserter needle with a catheter into a user&#39;s skin, control electronics  8  in the form of a circuit board with optional communications capabilities to outside devices such as a remote controller and computer, including a smart phone, a dose button  6  on the cover  2  for actuating an insulin dose, including a bolus dose, and a base  9  to which various components above may be attached via fasteners  91 . The patch pump  1  also includes various fluid connector lines that transfer insulin pumped out of the reservoir  4  to the infusion site. 
     It should be understood that inserter mechanisms come in various configurations. In some embodiments, the inserter mechanism inserts a soft catheter into the skin. In these embodiments, typically the soft catheter is supported on a rigid insertion needle. The insertion needle is inserted into the skin along with the soft catheter, and then retracted from the skin, leaving the soft catheter in the skin. In other embodiments, a soft catheter is not provided, and the insertion needle remains in the skin and forms a portion of the insulin flow path to deliver insulin until the infusion is finished. Insertion needles are typically hollow, and need to be hollow if they form part of the insulin flow path. However, insertion needles that support a soft catheter and then retract may be solid or hollow. If the insertion needle deploys a soft catheter, and retracts but remains part of the insulin flow path, then the insertion needle should be hollow. However, if the insertion needle deploys a soft catheter and then retracts but does not form part of the insulin flow path, then the insertion needle may be solid or hollow. In either case, the insertion needle is preferably rigid enough to penetrate the skin reliably, but otherwise may be made flexible enough to provide comfort to the user. 
       FIG. 3  is a perspective view of an alternative design for a patch pump  1 A having a flexible reservoir  4 A, and illustrated without a cover. Such arrangement may further reduce the external dimensions of the patch pump  1 A, with the flexible reservoir  4 A filling voids within the patch pump  1 A. The patch pump  1 A is illustrated with a conventional cannula insertion device  7 A that inserts the cannula, typically at an acute angle, less than 90 degrees, at the surface of a user&#39;s skin. The patch pump  1 A further comprises: a power source  5 A in the form of batteries; a metering sub-system  41  that monitors the volume of insulin and includes a low volume detecting ability; control electronics  8 A for controlling the components of the device; and a reservoir fill port  43  for receiving a refill syringe  45  to fill the reservoir  4 A. 
       FIG. 4  is a patch-pump fluidic architecture and metering sub-system diagram of the patch pump  1 A of  FIG. 3 . The power storage sub-system for the patch pump  1 A includes batteries  5 A. The control electronics  8 A of the patch pump  1 A may include a microcontroller  81 , sensing electronics  82 , pump and valve controller  83 , sensing electronics  85 , and deployment electronics  87  that control the actuation of the patch pump  1 A. The patch pump  1 A includes a fluidics sub-system that may include a reservoir  4 A, volume sensor  48  for the reservoir  4 A, a reservoir fill port  43  for receiving a refill syringe  45  to refill the reservoir  4 A. The fluidics sub-system may include a metering system comprising a pump and valve actuator  411  and an integrated pump and valve mechanism  413 . The fluidics sub-system may further include an occlusion sensor, a deploy actuator, as well as the cannula  47  for insertion into an infusion site on the user&#39;s skin. The architecture for the patch pumps of  FIGS. 1 and 2  is the same or similar to that which is illustrated in  FIG. 4 . 
     Referring to  FIG. 5  an embodiment of a delivery device  100  is shown having a housing  102  and an actuator button  104  for deploying the delivery cannula shown as a catheter and insertion needle into the patient. The delivery device  100  is typically a patch pump as in  FIGS. 1-4 . The delivery cannula shown with a catheter insertion mechanism, pump mechanism, and gearbox, operating system such as one or more circuit boards and other components needed to deliver the insulin or other substance to the patient.  FIG. 6  is a perspective view of the delivery device  100  after the actuator button  104  is pressed to insert the catheter  106  into the patient for delivering the substance to the patient. The delivery device has bottom wall defined by a base  108  that is coupled to the housing  102  and encloses the mechanical components for the delivery device including the pump and gearbox mechanism, pump motor, insertion needle, and catheter  106 . For clarity, the components of the pump and delivery mechanism are not shown in  FIGS. 5 and 6 . It is to be understood that the pump, pump motor and other components of the delivery device are similar to the embodiment shown in  FIGS. 1-4  and are mounted on or attached to the base  108 . 
     In an embodiment the user is able to insert the soft catheter and retract the introducer needle by depressing the actuator button of the device. Generally, no other interaction with the device is needed for catheter deployment and the initiation of medicament delivery. In other embodiments, subsequent to placement of the patch pump on the patient&#39;s skin and dosage setting, for example, by a remote device, the only required user interaction with the patch pump to insert the soft catheter, retract the introducer needle, and begin medicament delivery is to depress the button. 
       FIG. 7  is a top perspective view of the base  108  and  FIG. 8  is a bottom perspective view of the base in one embodiment. The base  108  is configured to couple to the housing  102  to enclose the various components of the delivery device including the pump mechanism  4  of  FIG. 2 . As shown in  FIG. 7 , the base  108  includes mounting posts  110  or other supports for coupling to the components of the pump mechanism  4 . The posts  110  project from the top face  112  of the base and are oriented to mount the components of the pump mechanism  4  to the base  108 . The posts  110  are positioned for supporting the components of the delivery device including the pump, pump motor, gear box or drive mechanism for the pump, electronic components, switches, timers and batteries. In the embodiment shown in  FIG. 7 , the posts  110  are spaced apart a distance for supporting the pump mechanism and motor for the pump mechanism. 
     In the embodiment shown in  FIG. 7 , a recess  114  is formed in the top face  112  between the posts  110 . The recess  114  has a shape and configuration complementing the shape and configuration of the pump mechanism, gearbox or drive mechanism, and the motor for operating the pump mechanism. A noise reducing component of the device is provided by a noise dampening member  116  in the recess  114  to be positioned between the base  108  and the mechanical components such as the pump mechanism, gearbox, or motor for operating the pump mechanism. The noise dampening member  116  is generally positioned proximate the moving components and noise producing components to absorb and dampen noise and vibration and reduce noise and vibration from the delivery device that can otherwise be perceived by the user. In the embodiment shown, the noise dampening member  116  is an elastomeric material that is sufficiently resilient to function as a noise dampening and vibration dampening material to dampen the noise and vibration from the components of the delivery device. The noise dampening material is typically applied as a molded component in the recess  114  with a thickness sufficient to dampen the noise and vibration produced by the pump mechanism, the gearbox of the pump mechanism, and the pump motor. 
     In the embodiment shown in  FIG. 7  and  FIG. 8 , the recess  114  is defined by an open area in the base  108  where the open area extends between the top face  112  and the bottom face  113 . The noise dampening member  116  is molded in the recess  114  and attached or bonded to the base. As shown in the embodiment of  FIG. 7 , the noise dampening member  116  has a top face  117  that is substantially flat and parallel to the top face  112  of the base  108 . 
     As shown in the embodiment of  FIG. 8 , the molded noise dampening member  116  has a bottom face  121  that is substantially aligned with the bottom face  113  of the base  108 . The bottom face  121  of the noise dampening member  116  can be molded with a plurality of tabs  119  integrally formed with the noise dampening member  116  and embedded within or attached to the bottom face  113  of the base  108  to stabilize and mechanically attach the noise dampening member  116  to the base  108 . The bottom face  113  of the base  108  in this embodiment has a plurality of recesses to accommodate the tabs  119  of the noise dampening member  116 . The tabs  119  of the noise dampening member  116  are preferably flush with the bottom face of the base and the bottom face of the noise dampening member  116 . The bottom face of the noise dampening member is generally flush with the bottom face of the base to form a continuous surface for contacting the patient during use. 
     In the embodiment shown, the base  108  is formed with the recess  114 . The noise dampening polymeric material is molded in the recess to form the noise dampening member  116  bonded to the base. The noise dampening member  116  can have a thickness corresponding to the depth of the recess  114  and/or the thickness of the base  108 . The noise dampening member  116  can also have a thickness so that the top face  117  of the noise dampening member  116  is recessed with respect to the top face  112  of the base  108  to define a recessed area or cavity for accommodating one or more of the components of the pump mechanism as shown in  FIG. 11 . In one embodiment, the recessed area has depth so that the pump mechanism does not directly contact the noise dampening member  116 . In other embodiments, the noise dampening member can have a thickness to extend upward from the top face  112  of the base  108  such that the top face of the noise dampening member is aligned with or extends from the top face  112  of the base. In another embodiment, the top face  112  of the base  108  can be substantially flat where the noise dampening material can be formed as a layer on the top surface and extend upwardly from the top face of the base  108 . In the various embodiments, the noise and vibration producing components of the pump mechanism are position above or proximate the noise dampening member. 
     The noise dampening member  116  can be a suitable material that is able to absorb and dampen the sound and vibration of the various components of the device and particularly the moving mechanical components of the motor, pump mechanism, and gearbox for operating the pump mechanism. In one embodiment, the noise dampening material is an elastomeric material that is able to reduce the transfer of the vibration, noises, and sounds produced by the components of the pump mechanism through the base and housing. The noise dampening material can be a thermoplastic elastomeric polymer that can be molded directly in or on the base  108  and/or in the recess  114 . An example of the thermoplastic elastomer can be a polyurethane elastomer that can be molded, bonded, or coated on the rigid plastic that is used to form the base  108 . Other examples of elastomers as the noise dampening material include natural rubber, polybutadiene, neoprene, silicones, polyisobutylene, and styrene-butadiene. The noise dampening material can be flexible to conform to the shape of the surface that supports the noise dampening member. 
     In one embodiment, the base  108  is an injection molded part made from a rigid plastic material that is able to support and protect the components of the device  100 . The noise dampening material can then be molded in the recess  114 , onto the base  108 , or on other parts by a two-shot molding process as known in the art to apply the noise dampening material to one or more areas on the base  108  or other parts of the device. The noise dampening member  116  is bonded to the supporting surface of the base  108  by the molding process. Alternatively, the noise dampening material is pre-formed and adhered by a suitable bonding method. In one embodiment, the noise dampening material is applied to selected locations in areas supporting the components that are likely to produce vibrations and sounds that can transfer through the base  108  and/or housing  102 . The location of the noise dampening material is selected to absorb vibrations and sounds from mechanical components of the device and reduce the vibrations and sounds perceived by the user. The noise dampening material in one embodiment is selected to be able to adhere sufficiently to the base  108  or other part during use of the device. 
     In the embodiment shown in  FIG. 7 , guides  118  are provided that project upwardly from the top face  112  of the base  108  in the vicinity of the noise dampening material  116  and between the posts  110 . The guides  118  form members for guiding and mating with the outer cover or housing of the device during assembly. Referring to  FIG. 7 , shelves  150  are formed with the posts  110  for supporting the pump mechanism, motor, and the gearbox mechanism for the pump mechanism. In the embodiment shown, the shelves  150  have a height to support the motor and gearbox and space the motor and gearbox from the top face of the base  108  and from the top face  117  of the noise dampening material  116 . The pump motor and gearbox are generally supported by the posts  110  and the shelves  150  above the noise dampening member without the pump motor and gearbox in direct contact with the top face  112  of the base  108  or the top face  117  of the noise dampening member  116  to reduce vibrations and noise from transferring through the base and housing  102 . The noise dampening member  116  is oriented on or in the base  108  to dampen vibrations or sounds of the, pump, motor and/or gearbox or other mechanical components that can be undesirable to the patient. In other embodiments, the motor and gearbox can contact the noise dampening member  116  where the noise dampening material is able to absorb vibrations and noise from the components. 
     In the embodiment of  FIGS. 7 and 8 , supports  120  are provided at an end portion of the base  108  for supporting printed circuit boards  121  or other electronic components for operating the motor and pump mechanism. A noise dampening member  122  formed from the noise dampening material is provided between supports  120  to absorb and dampen vibrations and noise produced in the device  100 . In the embodiment shown, two noise dampening members  122  are formed at opposite corners of the base  108 . In other embodiments the number and location of the noise dampening members  122  can vary depending on the construction of the device and location of the components. 
     In the embodiment shown, the noise dampening members  122  are formed in corresponding recesses  124  formed in the top face  112  of the base  108 . The noise dampening material can be molded within the recesses  124  with the top face  126  of the noise dampening member  122  formed substantially flush with the top face  112  of the base  108 . In other embodiments, the noise dampening material can be applied directly on the top face  112  to extend upward from the top face  112  a distance to provide a thickness sufficient to dampen vibrations and noise from the various components of the device. In other embodiments, the top face of the noise dampening member  122  can be recessed relative to the top face of the base. 
     In the embodiment shown, the recesses  124  define openings extending through the base between the top face  112  and the bottom face  113  of the base  108 . The noise dampening members  122  are molded in the recesses  124  with the top face  126  of the noise dampening members  122  aligned with and substantially flush with the top face  112  of the base  108 . The bottom face  128  of the noise dampening members  128  are aligned with and substantially flush with the bottom face  113  of the base  108 . 
     The recess  124  as shown in the bottom view of  FIG. 8  is formed by side walls extending between the top face  112  and bottom face  113  of the base  108 . A plurality of tabs  119  forming lugs are molded integrally with the noise dampening member  116  and extend outwardly to cooperate with the bottom face  113  of the base  108  to assist in mechanically attaching the noise dampening member  116  to the base  108 . Tabs  127  are molded on the bottom face  122  of the noise dampening member  122  and extend outward and contact the bottom face  113  of the base  108  for mechanically attaching the noise dampening member  122  to the base  108 . 
     Another embodiment of the invention is shown in  FIGS. 9-11  where a base  130  is configured for coupling to the housing  102  of the device and supporting the components of the device. As shown in  FIG. 9 , a recess  132  is formed in the top face  134  of the base  130  receiving a noise dampening member  136  formed from a noise and vibration absorbing material. As in the previous embodiment the noise dampening material is typically a thermoplastic elastomer such a polyurethane elastomer. The recess  132  in the embodiment shown is defined by an opening that extends through the base  130  between the top face  134  and the bottom face  142  of the base  130  as shown in the cross section of  FIG. 11 . 
     In the embodiment of  FIG. 9  and  FIG. 11 , the noise dampening member  136  has a thickness relative to the depth of the recess  132  and thickness of the base  130  so that the top face  160  of the noise dampening member  136  is recessed with respect to the top face  134  of the base  130  to form a recessed area to accommodate the pump mechanism. Alternatively, the top face  160  can be flush with the top face  134  of the base  130 . The bottom face  162  of the noise dampening member  136  is also shown as being aligned with and substantially flush with the bottom face  142  of the base  130  as shown in  FIG. 10  and  FIG. 11 . Posts  138  form supports that project upward from the top face  134  for supporting mechanical components such as the pump mechanism and gearbox of the pump mechanism. Shelves  140  are oriented around the perimeter of the recess  132  and the noise dampening member  136  for supporting one or more components of the device and to form a gap or space between the noise dampening member  136  and the mechanical components of the device. In the embodiment shown, the shelves  140  are formed with the posts  138  and oriented above the top face of the noise dampening member  136  to space the components of the device from the top face  134  of the base  130  and space the components from the top face  160  of the noise dampening member  136 . The top face of the noise dampening member  136  can be recessed relative to the top face of the based to form the recess area or cavity to accommodate a portion of one or more components of the pump mechanism. 
     As shown in  FIG. 9 , the noise dampening member  136  is formed with a plurality of projecting tabs  164  that extend upward from the top face  160  of the noise dampening member  136 . In the embodiment shown, four such tabs  164  are provided that are formed with a substantially flat top face  166 . As shown in  FIG. 9 , the tabs  164  are spaced around the perimeter of the noise dampening member  136  and extend outward from the perimeter to overlie and contact the top face  134  of the base  130 . The tabs  164  are integrally formed with the noise dampening member  136  to assist in mechanically attaching to the base  108 . 
     In the embodiment of  FIGS. 9 and 10 , the base  130  includes a second noise dampening member  170  at an end portion of the base  130  in the area where the printed circuit boards or other electronic components are supported within the device. As shown in  FIGS. 9 and 11 , the base  130  is provided with a recess  172  formed by an opening extending through the base  130  and extending between the top face  134  and bottom face  142  of the base  130 . The noise dampening member  170  is molded from an elastomeric material within the recess. In the embodiment shown in  FIG. 10 , the bottom face  176  of the noise dampening member  170  is aligned with and substantially flush with the bottom face  142  of the base  130 . 
     Referring to  FIGS. 9 and 11 , the noise dampening member  170  has a thickness greater than the thickness of the base  130  where the top face  178  of the noise dampening member  170  extends above the top face  142  of the base  130 . The top face  178  of the noise dampening member  170  is formed with a plurality of tabs  180  that extend outwardly from the side of the noise dampening member  170  to overlie the top face  142  of the base  130  as shown in  FIGS. 9 and 11  for mechanically attaching to the base. 
       FIGS. 12 and 13  illustrate a further embodiment where the noise dampening member  190  is formed as a separate member and attached or bonded to the device in a suitable location to provide the desired noise dampening and vibration dampening properties. In the embodiment shown in  FIG. 12 , the noise dampening member  190  is formed as a sheet-like member having an outer or top side  192  and an inner or bottom side  194  having an adhesive or mastic  196  applied to the bottom side for attaching to the selected surface of device. In the embodiment shown, the noised dampening member  190  has shape complementing the shape and dimension of the base and has a thickness sufficient to provide the desired level of noise dampening without interfering with the mounting of the components of the device. The adhesive  196  can be applied to the entire surface of the noise dampening member or only to selected portions depending on the requirements for the device. The noise dampening member can have a shape and dimension to fit in a suitable location in or on the device to dampen sounds. The noised dampening member can be attached to an inner surface of the base within the cavity of the device on an outer face of the base. 
       FIGS. 14 and 15  illustrate another embodiment of the invention where the noise dampening member  200  has a shape and configuration to cover a portion of the base of the device. The noise dampening member  200  has an outer edge  202  configured to complement the outer dimension of the base with a plurality of cut-outs  204  and openings  206  to accommodate the various tabs, supports and components of the device that project from or are supported by the base as in the previous embodiments. As shown in  FIG. 15  an adhesive or mastic layer  208  is applied to a bottom side  210  of the noise dampening member  200  for attaching directly to the base. 
     The noise dampening materials can be formed from a thermoplastic elastomer as in the previous embodiments and have a thickness and dimension to provide sufficient noise dampening from the mechanical components in the device. In other embodiments, the noise dampening member can have a dimension complementing the dimensions of the top face of the base. In other embodiments, the noise dampening member can be attached to a top surface of the base have a dimension less than the dimension of the top face of the base. In further embodiments, the noise dampening member can be attached to or bonded to a surface of the housing or cover in a selected location to provide the desired noise dampening property. 
     In the embodiments illustrated, the noise dampening member can be molded or formed within the base and located or positioned at a suitable location where the noise dampening member can dampen the sounds produced by the pump mechanism or outer components that can produce sounds and/or vibrations that can be perceived by the user. The noise dampening material member can be molded in a recess or opening formed in the base and attached directly to the base by suitable mechanisms. The noise dampening member can be spaced from the moving mechanical components or can be positioned between the mechanical components and the base to reduce the noise and vibrations from transferring to the base. In the embodiment shown, the noise dampening member has at least one surface facing the components of the pump mechanism. 
     Generally the thickness and dimension of the noise dampening member provide the desired noise dampening properties. In the embodiment where the noise dampening member is positioned between the pump mechanism or other noise producing component and the base, the thickness of the noise dampening member is limited by the position of the mechanical components. Where the noise dampening member is positioned in other locations, the thickness of the noise dampening member can be increased to increase the noise dampening properties. The dimension of the noise dampening member can be a suitable size to fit within the boundary or perimeter of the base or other part without interfering with the operation of the device. In other embodiments, the noise dampening member can be attached to a bottom face of the base or at other locations on the outer or inner surfaces of the device. 
     Although only a few embodiments of the present invention have been shown and described, the present invention is not limited to the described embodiments. Instead, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention. It is particularly noted that those skilled in the art can readily combine the various technical aspects of the various elements of the various exemplary embodiments that have been described above in numerous other ways, all of which are considered to be within the scope of the invention, which is defined by the appended claims and their equivalents. Features of the different embodiments can be combined with other embodiments or features as long as they do not contradict each other.