US 9,451,897 B2Grant
Body adherent patch with electronics for physiologic monitoring
Issue Date:2016-09-27
•21 Claims
•8 Drawing Sheets
Abstract
In one configuration, an adherent device to adhere to a skin of a subject includes a stretchable base layer having an upper side and a lower side and an adhesive coating on the lower side to adhere the base layer to the skin of the subject. The base layer has at least two openings extending therethrough, each of the at least two openings having a size. The adherent device also includes a stretchable covering layer positioned above and adhered to the base layer with an adhesive to define at least two pockets. The adherent device also includes at least two gels, each gel having a size larger than the size of openings to retain the gel substantially within the pocket, and a circuit carrier supported with the stretchable base layer to measure at least one physiologic signal of the subject. Other configurations and methods are also claimed.
Metadata
Assignee
- Medtronic Monitoring, Inc.
Inventors
- Scott T. Mazar
- Senthil Swaminathan
- Jonathan Engel
- Arthur Lai
Application Information
Application Number:US 12/958,910
Filing Date:2010-12-02
Priority Date:2009-12-14
Art Unit:3739
Classifications
IPC:
A61B5/04A61B5/0408A61B5/0432A61B5/00
Field of Search:
A61B 5/04A61B 5/6833A61B 2560/0412A61B 5/0006A61B 5/0205A61N 1/0492A61N 1/0476
Patent Drawings (8 sheets)
Description
[0001] This application claims priority from provisional U.S. Patent Application No. 61/286,075, titled “Body Adherent Patch with Electronics for Physiologic Monitoring” and filed Dec. 14, 2009, the entire disclosure of which is hereby incorporated by reference herein for all purposes.
Background of the Invention
[0002] 1. Field of the Invention
[0003] The present invention relates to physiologic monitoring and/or therapy. Although embodiments make specific reference to monitoring impedance and electrocardiogram signals with an adherent device, the system methods and devices described herein may be applicable to many applications in which physiological monitoring and/or therapy is used for extended periods, for example wireless physiological monitoring for extended periods.
[0004] Patients are often treated for diseases and/or conditions associated with a compromised status of the patient, for example a compromised physiologic status. In some instances, a patient may report symptoms that require diagnosis to determine the underlying cause. For example, a patient may report fainting or dizziness that requires diagnosis, in which long term monitoring of the patient can provide useful information as to the physiologic status of the patient. In some instances a patient may have suffered a heart attack and require care and/or monitoring after release from the hospital. One example of a device to provide long term monitoring of a patient is the Holter monitor, or ambulatory electrocardiography device.
[0005] In addition to measuring heart signals with electrocardiograms, known physiologic measurements include impedance measurements. For example, transthoracic impedance measurements can be used to measure hydration and respiration. Although transthoracic measurements can be useful, such measurements may use electrodes that are positioned across the midline of the patient, and may be somewhat uncomfortable and/or cumbersome for the patient to wear. In at least some instances, the electrodes that are held against the skin of the patient may become detached and/or dehydrated, such that the electrodes must be replaced, thereby making long term monitoring more difficult.
[0006] Work in relation to embodiments of the present invention suggests that known methods and apparatus for long term monitoring of patients may be less than ideal. In at least some instances, devices that are worn by the patient may be somewhat uncomfortable. Although devices that adhere measurement electrodes and measurement circuitry to the skin with an adhesive can provide improved comfort, work in relation to embodiments of the present invention suggests that the adhesive of such devices can detach from the skin of the patient sooner than would be ideal. These limitations of current devices may lead to patients not wearing the devices as long as would be ideal and not complying with direction from the health care provider in at least some instances, such that data collected may be less than ideal.
[0007] Similar difficulties may arise in the monitoring of other subjects, such as persons in non-medical settings, or in the monitoring of animals such as veterinary, agricultural, or wild animal monitoring. Therefore, a need exists for improved subject monitoring. Ideally, such improved subject monitoring would avoid at least some of the short-comings of the present methods and devices. Ideally, such improved devices will allow an adherent device to be adhered to the skin of the subject with an adhesive so as to carry associated electronics comfortably with the skin of the subject for an extended period.
[0008] 2. Description of the Background Art
[0009] The following U.S. Patents and Publications may describe relevant background art: U.S. Pat. Nos. 3,170,459; 3,805,769; 3,845,757; 3,972,329; 4,141,366; 4,522,211; 4,669,480; 4,838,273; 5,133,355; 5,150,708; 5,450,845; 5,511,533; 5,607,454; 6,141,575; 6,198,955; 6,327,487; 6,795,722; 7,395,106; 2004/0006279; 2004/0015058; 2006/0264730; 2007/0106132; 2007/0208262; 2007/0249946; 2007/0255184; 2008/0171929; 2007/0276273; and 2009/0182204.
Brief Summary of the Invention
[0010] In many embodiments, an adherent device to adhere to a skin of a subject comprises a stretchable base layer having an upper side and a lower side and an adhesive coating on the lower side to adhere the base layer to the skin of the subject. The base layer has at least two openings extending therethrough, each of the at least two openings having a size. The adherent device also comprises a stretchable covering layer positioned above and adhered to the base layer with an adhesive to define at least two pockets, and at least two gels, each gel having a size larger than the size of the at least two openings to retain said gel substantially within said pocket. The adherent device further comprises a circuit carrier supported with the stretchable base layer to measure at least one physiologic signal of the subject. The subject may comprise a person, an athlete, a patient, or an animal such as a domesticated or a wild animal.
[0011] According to some embodiments, an adherent device to monitor a subject having a skin comprises a stretchable base layer having an upper side and a lower side and an adhesive coating disposed on the lower side to adhere the base layer to the skin of the subject. The base layer has at least two openings extending therethrough, each opening having a size. The adherent device further includes a flexible circuit support having at least two electrodes disposed thereon, each electrode positioned with a respective one of the at least two openings to couple to the skin of the subject. At least two gels are positioned with the at least two openings in the base layer, each gel having a size larger than the size of said each opening. The device also includes a stretchable covering layer positioned above the at least two gels and adhered to the base layer, such that each gel is constrained substantially within a corresponding pocket disposed between the base layer and the covering layer. The adherent device further includes a circuit carrier holding electronic components electrically connected to the at least one electrode with the flexible circuit support to measure at least one physiologic signal of the subject.
[0012] In some embodiments, each of the gels and each of the pockets is sized larger than a corresponding opening of the stretchable base layer to retain said gel in said pocket when the stretchable base layer is adhered to the skin of the subject. In some embodiments, the stretchable base layer comprises a thin, flexible, stretchable base layer to stretch with the skin of the subject and conform to folds of the skin of the subject. In some embodiments, the stretchable covering layer comprises a thin, flexible, stretchable covering layer to stretch with the skin of the subject and conform to folds of the skin of the subject. The adherent device may further include a thin, flexible, stretchable overlayer disposed above and adhered to the covering layer. The overlayer may be made of woven fabric.
[0013] In some embodiments, the adherent device further comprises a stiffening structure disposed over and coupled to a common perimeter of the base and covering layers and configured to stiffen the perimeter edges of the base and covering layers. The stiffening structure may be configured to be removable after the adherent device is adhered to the subject. In some embodiments, the adherent device further comprises a thin, flexible, stretchable overlayer disposed above and adhered to the covering layer, and the stiffening structure is disposed over and coupled to a common perimeter of the base and covering layers and the overlayer, and the stiffening structure is configured to stiffen the perimeter edges of the base and covering layers and the overlayer. The adherent device according to these embodiments may further include a soft, flexible cover disposed over the circuit carrier and coupled at a common perimeter to the base and covering layers. The cover may comprise a material configured to inhibit liquids from reaching the electronic components. A perimeter of the cover may be disposed under the stiffening structure. In some embodiments, the flexible circuit is configured to be stretchable.
[0014] In some embodiments, the flexible circuit is formed of a substantially non-stretchable material, and is geometrically configured to be stretchable. In some embodiments, the flexible circuit comprises a polyester base and traces formed of silver conductive ink. The flexible circuit may comprise a serpentine shape. The flexible circuit may be disposed between the base layer and the covering layer.
[0015] In some embodiments, the adherent device further comprises a compliant connection between the circuit carrier and the base layer. In some embodiments, the combination of the base layer and the covering layer is breathable. The combination of the base layer and the covering layer may have a moisture vapor transmission rate of at least 100 g/m2/day.
[0016] According to some embodiments, an adherent device comprises a thin, flexible, stretchable base layer having an upper side and a lower side and an adhesive coating on the lower side. At least one electrode is affixed to the base layer and is capable of electrically coupling to the skin of a subject. A flexible circuit is connected to the at least one electrode, and a circuit carrier holding electronic components is electrically connected to the at least one electrode via the flexible circuit and configured to measure at least one physiologic signal of the subject. The adherent device further includes a stiffening structure disposed over and coupled to a perimeter of the base layer and configured to stiffen the perimeter edge of the base layer. In some embodiments, the stiffening structure is configured to be removable when the adherent device is adhered to the subject. The stiffening structure may be made from a vinyl sheet.
[0017] In some embodiments, the adherent device further comprises a thin, flexible, stretchable overlayer disposed above and adhered to the base layer, and the stiffening structure is disposed over and coupled to a common perimeter of the base layer and overlayer and is configured to stiffen the perimeter edge of the base layer and overlayer. According to some embodiments, the adherent device further includes a gel patch under each electrode, and each gel patch enhances electrical conductivity between its respective electrode and the skin of the subject. The flexible circuit is configured to be stretchable.
[0018] In some embodiments, the adherent device further comprises a soft, flexible cover disposed over the circuit carrier and coupled at a perimeter to the base layer. The cover may comprise a material configured to inhibit liquids from reaching the electronic components. The lower side of the base layer is configured to adhere to the skin of a subject.
[0019] In some embodiments, the adherent device further comprises a thin, flexible, stretchable underlayer adhered to the lower side of the base layer, the underlayer configured to adhere to the skin of the subject. The combination of the base layer and underlayer may be breathable. The combination of the base layer and underlayer may has a moisture vapor transmission rate of at least 100 g/m2/day.
[0020] In some embodiments, the adherent device further comprises a gel patch under each electrode, and each gel patch enhances electrical conductivity between its respective electrode and the skin of the subject, and a perimeter of each gel patch is sandwiched between the base layer and the underlayer. In some embodiments, the underlayer comprises at least one opening through which electrical contact is made between the at least one electrode and the skin of the subject. The adherent device many further include a compliant connection between the circuit carrier and the base layer.
[0021] According to some embodiments, an adherent device comprises a thin, flexible, stretchable base layer having an upper side and a lower side and an adhesive coating on the lower side. At least one electrode is affixed to the base layer and capable of electrically coupling to the skin of a subject. A flexible circuit is connected to the at least one electrode, and is configured to stretch. The adherent device further includes a circuit carrier holding electronic components electrically connected to the at least one electrode via the flexible circuit and configured to measure at least one physiologic signal of the subject.
[0022] In some embodiments, the flexible circuit is formed of a substantially non-stretchable material, and is geometrically configured to be stretchable. In some embodiments, the flexible circuit comprises a polyester base and traces formed of silver conductive ink. The flexible circuit may comprise a serpentine shape. The flexible circuit may comprise a sawtooth shape.
[0023] In some embodiments, the adherent device further comprises gel patch under each electrode, and each gel patch enhances electrical conductivity between its respective electrode and the skin of the subject. In some embodiments, the base layer is configured to adhere to the skin of the subject, and the adherent device further comprises a thin, flexible, stretchable overlayer disposed above and adhered to the base layer. In some embodiments, the adherent device further comprises a thin, flexible, stretchable underlayer disposed below and adhered to the base layer, and the underlayer is configured to adhere to the skin of the subject. In some embodiments the adherent device further comprises a stiffening structure disposed over and coupled to a perimeter of the base layer and configured to stiffen the perimeter edge of the base layer. The adherent device may comprise a compliant connection between the circuit carrier and the base layer.
[0024] According to some embodiments, an adherent device to monitor a subject having a skin comprises a stretchable base layer having an upper side and a lower side and an adhesive coating on the lower side to adhere the base layer to the skin of a subject. The base layer has at least two openings extending therethrough, each of the at least two openings having a size. A stretchable covering layer is positioned above and adhered to the base layer with an adhesive to define at least two pockets. The adherent device further comprises a flexible circuit support that includes a first portion and a second portion, the first portion of the support adhered between the stretchable base layer and the stretchable covering layer, the second portion extending from the first portion. At least two electrodes are disposed on the first portion of the flex circuit support. The adherent device further includes at least two gels, and each gel and each electrode are positioned within a corresponding pocket, each gel having a size larger than the size of the respective opening to retain said gel substantially within said pocket between the base layer and the covering layer. The adherent device further includes a circuit carrier supported with the stretchable base layer, the circuit carrier holding electronic components electrically connected to the at least two electrodes with the second portion of the flexible circuit support to relieve strain when the stretchable base layer stretches with the skin of the subject, the electronic components configured to measure at least one physiologic signal of the subject.
[0025] According to some embodiments, a method of manufacturing an adherent device to adhere to a skin of a subject comprises providing a stretchable base layer having an upper side and a lower side and an adhesive coating on the lower side to adhere the base layer to the skin of a subject. The base layer has at least two openings extending therethrough, each of the at least two openings having a size. The method further comprises providing a flexible circuit support having at least two electrodes and traces of electrically conductive material disposed thereon, providing at least two gels, and providing a stretchable covering layer. The method further comprises positioning the flexible circuit support and at least two gels between the stretchable base layer and the stretchable covering layer, and adhering the stretchable base layer to the stretchable covering layer to form at least two pockets, wherein each pocket has one of the at least two gels and one of the electrodes disposed therein. The method also includes coupling a circuit carrier to the at least two electrodes with the flexible circuit support.
[0026] According to some embodiments, a method of monitoring a patient having a skin comprises adhering a stretchable base layer affixed to a stretchable covering layer to the skin of the patient. The stretchable base layer and the stretchable covering layer define a plurality of pockets with gels and electrodes disposed therein and the electrodes are coupled to the skin with the gels disposed in the pockets. The method further comprises measuring signals from the electrodes to monitor the patient.
[0027] According to some embodiments, an adherent device to adhere to a skin of a subject comprises means for adhering to a skin of a subject, and a circuit carrier means coupled to the means for adhering to measure at least one physiologic signal of the subject.
[0028] Other embodiments are also described and claimed.
Brief Description of the Drawings
[0029] FIG. 1 shows a patient and a monitoring system comprising an adherent device, in accordance with embodiments of the present invention.
[0030] FIG. 2A shows a partial exploded perspective view of an adherent device as in FIG. 1 , in accordance with embodiments of the invention.
[0031] FIG. 2B illustrates an exploded view of a support patch, according to embodiments of the invention.
[0032] FIG. 2C shows a bottom view of the support patch of FIG. 2B .
[0033] FIG. 3 shows a flexible circuit that is configured to be stretchable, in accordance with embodiments of the invention.
[0034] FIG. 4 illustrates a compliant connection between a circuit carrier and a base layer, in accordance with embodiments of the invention.
[0035] FIG. 5 illustrates an exploded view of an adherent device in accordance with additional embodiments of the invention.
[0036] FIG. 6 illustrates an exploded oblique view of an adherent device in accordance with additional embodiments of the invention.
Detailed Description of the Invention
[0037] Embodiments of the present invention relate to subject monitoring and/or therapy. Although embodiments make specific reference to monitoring impedance and electrocardiogram signals with an adherent device, the system methods and device described herein may be applicable to any application in which physiological monitoring and/or therapy is used for extended periods, for example wireless physiological monitoring for extended periods.
[0038] Embodiments of the present invention can be particularly well suited for use with an adherent device that comprises a support, for example a patch that may comprise stretchable tape, such that the support can be configured to adhere to the subject and support the electronics and sensors on the subject. The support may also be porous and breathable so as to allow water vapor transmission, for example as described U.S. Pat. Pub. No. 2009/0076363, the full disclosure of which is incorporated herein by reference and suitable for combination in accordance with some embodiments of the present invention described herein. The adherent device may comprise a cover and electronic components disposed on a carrier coupled to the support so as to provide strain relief, such that the support can stretch and flex with the skin of the subject. The embodiments described herein can be particularly useful to inhibit motion of the electronics circuitry carrier when the support stretches and flexes, so as to decrease localized loading of the support that may contribute to peeling. When forces are localized near an edge of the adherent device, for example when the carrier moves against a cover, the localized forces may cause peeling near the edge, and the embodiments described herein can inhibit such localized forces with a compliant structure that inhibits motion of the carrier relative to the support and also allows the support to stretch.
[0039] FIG. 1 shows an example subject, patient P, and a monitoring system 10. Patient P comprises a midline M, a first side S1, for example a right side, and a second side S2, for example a left side. Monitoring system 10 comprises an adherent device 100. Adherent device 100 can be adhered to a patient P at many locations, for example thorax T or arm A of patient P. In many embodiments, the adherent device may adhere to one side of the patient, from which side data can be collected. Work in relation with embodiments of the present invention suggests that location on a side of the patient can provide comfort for the patient while the device is adhered to the patient.
[0040] Monitoring system 10 includes components to transmit data to a remote center 106. Remote center 106 can be located in a different building from a subject such as patient P, for example in the same town as the subject, and can be located as far from the subject as a separate continent from the subject, for example the subject located on a first continent and the remote center located on a second continent. Adherent device 100 can communicate wirelessly to an intermediate device 102, for example with a single wireless hop from the adherent device on the subject to the intermediate device. Intermediate device 102 can communicate with remote center 106 in many ways, for example with an internet connection and/or with a cellular connection. In many embodiments, monitoring system 10 comprises a distributed processing system with at least one processor comprising a tangible medium on device 100, at least one processor on intermediate device 102, and at least one processor 106P at remote center 106, each of which processors can be in electronic communication with the other processors. At least one processor 102P comprises a tangible medium 102T, and at least one processor 106P comprises a tangible medium 106T. Remote processor 106P may comprise a backend server located at the remote center. Remote center 106 can be in communication with a health care provider 108A with a communication system 107A, such as the Internet, an intranet, phone lines, wireless and/or satellite phone. Health care provider 108A, for example a family member, can be in communication with patient P with a communication, for example with a two way communication system, as indicated by arrow 109A, for example by cell phone, email, landline. Remote center 106 can be in communication with a health care professional, for example a physician 108B, with a communication system 107B, such as the Internet, an intranet, phone lines, wireless and/or satellite phone. Physician 108B can be in communication with patient P with a communication, for example with a two way communication system, as indicated by arrow 109B, for example by cell phone, email, landline. Remote center 106 can be in communication with an emergency responder 108C, for example a 911 operator and/or paramedic, with a communication system 107C, such as the Internet, an intranet, phone lines, wireless and/or satellite phone. Emergency responder 108C can travel to the patient as indicated by arrow 109C. Thus, in many embodiments, monitoring system 10 comprises a closed loop system in which patient care can be monitored and implemented from the remote center in response to signals from the adherent device.
[0041] In many embodiments, the adherent device may continuously monitor physiological parameters, communicate wirelessly with a remote center, and provide alerts when necessary. The system may comprise an adherent patch, which attaches to the subject's thorax and contains sensing electrodes, battery, memory, logic, and wireless communication capabilities. In some embodiments, the device can communicate with the remote center, via the intermediate device in the subject's home. In some embodiments, the remote center 106 receives the patient data and applies a patient evaluation and/or prediction algorithm. When a flag is raised, the center may communicate with the patient, hospital, nurse, and/or physician to allow for therapeutic intervention, for example to prevent decompensation.
[0042] In many embodiments, the adherent device may comprise a reusable electronics module with replaceable patches, and each of the replaceable patches may include a battery. The module may collect cumulative data for approximately 90 days and/or the entire adherent component (electronics+patch) may be disposable. In a completely disposable embodiment, a “baton” mechanism may be used for data transfer and retention, for example baton transfer may include baseline information. In some embodiments, the device may have a rechargeable module, and may use dual battery and/or electronics modules, wherein one module 101A can be recharged using a charging station 103 while the other module 101B is placed on the adherent patch with connectors. In some embodiments, the intermediate device 102 may comprise the charging module, data transfer, storage and/or transmission, such that one of the electronics modules can be placed in the intermediate device for charging and/or data transfer while the other electronics module is worn by the subject.
[0043] System 10 can perform the following functions: initiation, programming, measuring, storing, analyzing, communicating, predicting, and displaying. The adherent device may contain a subset of the following physiological sensors: bioimpedance, respiration, respiration rate variability, heart rate (ave, min, max), heart rhythm, heart rate variability (hereinafter “HRV”), heart rate turbulence (hereinafter “HRT”), heart sounds (e.g. S3), respiratory sounds, blood pressure, activity, posture, wake/sleep, orthopnea, temperature/heat flux, and weight. The activity sensor may comprise one or more of the following: ball switch, accelerometer, minute ventilation, HR, bioimpedance noise, skin temperature/heat flux, BP, muscle noise, posture. Additional details about the use of an adherent patch to measure particular physiologic signals may be found in co-pending U.S. patent application Ser. No. 12/209,273 (publication 2009/0076363) and Ser. No. 12/209,288 (publication 2009/0076345), both filed on Sep. 12, 2008 and titled “Adherent Device with Multiple Physiologic Sensors”
[0044] The adherent device can wirelessly communicate with remote center 106. The communication may occur directly (via a cellular or Wi-Fi network), or indirectly through intermediate device 102. Intermediate device 102 may consist of multiple devices, which can communicate wired 104 or wirelessly to relay data to remote center 106.
[0045] In many embodiments, instructions are transmitted from remote site 106 to a processor supported with the adherent patch on the subject, and the processor supported with the subject can receive updated instructions for the subject treatment and/or monitoring, for example while worn by the subject.
[0046] In order for complete and reliable data to be gathered by system 10, and for optimal subject comfort, it is desirable that adherent device 100 remain securely attached to subject for a predetermined period of time, for example one week, or two weeks or more. If adherent device 100 becomes dislodged prematurely, such that one or more of the sensing electrodes no longer makes secure contact with the subject's skin, valuable medical or other data may be lost. For example, a dislodged adherent device 100 may also need to be replaced, causing discomfort for a patient, inconvenience for medical personnel, and unwanted expense.
[0047] Various adhesion failure mechanisms have been noted. Normal subject activity may result in adherent device 100 being stretched, bumped, jostled, or otherwise moved in a way that tends to stress the adhesive joint with the subject's skin. This may be especially true for an adherent device that is worn for a long period of time, during which the subject may wish to carry on normal activities, including exercise, bathing, and the like. The edges of the support patch may be especially prone to separation from the skin, and may form pathways for ingress of moisture, which can accelerate the deterioration of the adhesive bond between the adherent device and the skin. The difficulty of maintaining a secure bond to the subject's skin may be further exacerbated as it becomes desirable to add new features and capabilities to a device such as adherent device 100. For example, in order to extend the working life of adherent device 100 or to provide sophisticated features, it may be desirable to include a battery having considerable weight, and additional electronics or packaging as compared with previous designs. The combined weight of the battery and electronics may be as much as 60 grams or more, such that jostling of the unit may impart significant inertial loads on the bond with the subject's skin. In addition, the position of the adherent device may affect the durability of the adhesive bond with the subject's skin. For example, especially useful electrocardiogram readings may be obtained by a device placed between a patient's left clavicle and left nipple. However, this area is also prone to stretching, and may present a difficult site for long-term adhesion. Even if an alternative site is used, for example along the patient's rib line, enhanced adhesion durability is desirable.
[0048] In addition to the medical setting described above, embodiments of the present invention may also be used in non-medical settings, and on subjects other than human medical patients. For example, an adherent device according to embodiments of the invention may be used to monitor the heart rate or other data of an athlete during exercise. In another setting, an adherent device according to embodiments of the invention may be used to monitor an animal for agricultural research, veterinary medical testing or treatment, or other purposes. For the purposes of this disclosure, a subject is any human or animal to which an adherent device according to embodiments of the invention may be adhered, for any purpose. While certain example uses of adherent devices are described herein in relation to monitoring or treatment of a medical patient, the appended claims are not so limited. Whatever the setting or subject, embodiments of the present invention provide improved durability of the adhesive bond between the adherent device and the subject's skin, as compared with prior adherent devices.
[0049] FIG. 2A shows a partial exploded perspective view of adherent device 100 as in FIG. 1 , in accordance with embodiments of the invention. Adherent device 100 comprises a support patch 201, which may further comprise a base layer 202 and a covering layer 203. Base layer 202 is stretchable, and has an upper side 204 and a lower side 205, and an adhesive coating on lower side 205 to adhere base layer 202 to the skin of a subject. Covering layer 203 is also stretchable, and is positioned above and adhered to base layer 202. FIG. 2B illustrates an exploded view of support patch 201, according to embodiments of the invention. As is best seen in FIG. 2B , a flexible circuit 206 includes at least two electrodes, for example electrodes 207A, 207B, 207C, and 207D that during use are in electrical contact with the skin of the subject. Flexible circuit 206 may also sometimes be called a flexible circuit support. Flexible circuit 206 electrically connects electrodes 207A, 207B, 207C, and 207D to a circuit carrier 208, which holds electronic components 209 configured to measure at least one physiologic signal of the subject. Electronic components 209 may include an antenna 210 so that adherent device 100 can communicate its readings for remote monitoring. Circuit carrier 208 may be mechanically connected to and supported by base layer 202 by any suitable means, including those discussed in more detail below.
[0050] Adherent device 100 may further comprise a housing 211 that fits over electronic components 209, providing protection, insulation, and cushioning for electronic components 209. Housing 211 may further include features for holding a battery 212. Housing 211 may be made, for example of a soft silicone rubber. In other embodiments, housing 211 may comprise an encapsulant over electronic components 209 and circuit carrier 208. Housing 211 may provide protection of electronic components 209 from moisture.
[0051] Adherent device 100 may also comprise a cover 213 adhered to support patch 201. Cover 213 may comprise any known biocompatible cover, casing and/or housing materials, such as elastomers, for example silicone. The elastomer may be fenestrated to improve breathability. In some embodiments, cover 213 may comprise other breathable materials, for example a cloth including polyester, polyamide, nylon and/or elastane (Spandex™). The breathable fabric may be coated or otherwise configured to make it water resistant, waterproof, for example to aid in wicking moisture away from the patch, or to inhibit liquids from reaching electronic components 209.
[0052] While adherent device 100 is shown as generally oblong and having a length of about two to three times its width, this is not a requirement. One of skill in the art will recognize that other shapes are possible for an adherent device according to embodiments of the invention. For example, support patch 201 could be round, elliptical or oblong with a length only slightly larger than its width, square, rectangular, or some other shape. And while electrodes 207A, 207B, 207C, and 207D are illustrated as being arranged linearly, this is also not a requirement. One of skill in the art will recognize that electrodes 207A, 207B, 207C, and 207D could be arranged in any pattern suitable for the intended use of adherent device 100, including in a circular, oblong, square, rectangular, or other pattern.
[0053] Referring again to FIG. 2B , base layer 202 includes at least two openings, in this case four openings 215A, 215B, 215C, and 215D, each corresponding to one of electrodes 207A, 207B, 207C, and 207D. Each opening is of a certain size. Gels 214A, 214B, 214C, and 214D are placed at the openings, between base layer 202 and covering layer 203. Each of gels 214A, 214B, 214C, and 214D comprises a hydrogel patch of electrically conductive gel material that enhances electrical conductivity between its respective electrode and the skin of the subject. For example, the gels 214A, 214B, 214C, and 214D may be made of hydrogel adhesive 9880 available from the 3M Company of St. Paul, Minn., USA, or another suitable material.
[0054] Each of gels 214A, 214B, 214C, and 214D is larger than its respective opening 215A, 215B, 215C, or 215D, such that when covering layer 203 and base layer 202 are adhered together, a pocket is formed over each of openings 215A, 215B, 215C, and 215D, with one of gels 214A, 214B, 214C, and 214D retained in each respective pocket.
[0055] Preferably, base layer 202, covering layer 203, or both are thin, flexible, and stretchable to stretch with the skin of the subject and conform to folds of the skin of the subject. For example, either or both of these layers may be made of MED 5021 polyurethane film available from Avery Dennison Corporation of Pasadena, Calif., USA, or Tegaderm™ film available from the 3M Company of St. Paul, Minn., USA. Other suitable materials may be used.
[0056] In some embodiments, support patch 201 may further include an overlayer 216 disposed above and adhered to covering layer 203. Overlayer 216 is also preferably thin, flexible, and stretchable. For example, overlayer 216 may be made of a woven fabric.
[0057] Referring again to FIG. 2A , gels 214A, 214B, 214C, and 214D are preferably placed under covering layer 203 (and overlayer 216, if present). Flexible circuit 206 may also be positioned under covering layer 203, as indicated by the broken line depiction of part of flexible circuit 206 in FIG. 2B . Gels 214A, 214B, 214C, and 214D may thus be retained in pockets between base layer 202 and covering layer 203.
[0058] Adherent device 100 may further comprise a stiffening structure such as stiffening structure 217 shown in FIG. 2A . In this example embodiment, stiffening structure 217 is configured to adhere to the top of cover 213, at an outer area 218 of cover 213. As assembled, stiffening structure 217 is then coupled to a common perimeter of the base and covering layers, so that the perimeter edges of the base and covering layers are stiffened, for example to prevent curling or unintentional adhesion of the lower side 205 of base layer 202 to itself. Stiffening structure 217 may be made of a material that is stiffer than the materials used in base patch 201, but still compliant enough to allow base patch 201 to conform to the subject's skin as the patch is adhered to the skin. For example, stiffening structure 217 may be made from a vinyl sheet. Stiffening structure 217 may also be configured to be removable after adherent device 100 is adhered to the subject's skin. For example, stiffening structure 217 may include an adhesive configured to hold stiffening structure 217 in place during application of adherent device 100 to the subject, but to release easily without dislodging adherent device 100 from the subject's skin. In this way, stiffening structure 217 may aid in achieving a secure adhesion of adherent device 100 to the subject, but not interfere with the ability of support patch 201 to conform to wrinkles, folds, and other movements of the subject's skin while adherent device 100 is worn.
[0059] FIG. 2C shows a bottom view of support patch 201, with bottom lower side 205 of base layer 202 visible. Also visible are openings 215A, 215B, 215C, and 215D, exposing portions of gels 214A, 214B, 214C, and 214D. Other portions of gels 214A, 214B, 214C, and 214D are behind base layer 202, in pockets formed between base layer 202 and covering layer 203.
[0060] In some embodiments, flexible circuit 206 may be made of a flexible material such as polyimide, polyester, or another base material, having circuit traces formed in or on the base material. The circuit traces may be, for example, made of copper, a copper alloy, silver ink, or another conductive material. In one preferred embodiment, flexible circuit 206 comprises a polyester base and traces formed of silver conductive ink. In some embodiments, flexible circuit 206 may be configured to be stretchable, as well as flexible. Even if the material of the flexible circuit 206 is not inherently stretchable, the flexible circuit may be made effectively stretchable by properly configuring its geometric shape. For example, at least the portion of flexible circuit 206 in contact with support patch 201 may have a serpentine shape that allows support patch 201 to stretch and conform itself to the skin of the subject to which adherent device 100 is adhered, without being unduly constrained by flexible circuit 206. A flexible circuit 206A having this characteristic is shown in FIG. 3 . Other configurations may be used as well. For example, flexible circuit 206A may have a sawtooth shape, or another shape that enables stretching of the flexible circuit 206A.
[0061] As was mentioned previously, circuit carrier 208 may have a compliant connection to base layer 202. One exemplary kind of compliant connection is illustrated in FIG. 4 . In this connection, bridging loops 401A, 401B, 401C, and 401D connect from support patch 201 (which includes base layer 202) to circuit carrier 208. Loops 401A, 401B, 401C, and 401D may be made, for example, of a plastic reinforced paper, a plastic film, a fabric, metal, or any other suitable material. Preferably, loops 401A, 401B, 401C, and 401D permit relatively free rotation of circuit carrier 208 about the X and Y axes illustrated in FIG. 4 , but constrain the rotation of circuit carrier 208 about the Z axis. Because each of loops 401A, 401B, 401C, and 401D connects to support patch 201 at an inner portion 402 rather than at an outer portion 403 of support patch 201, loads imparted to support patch 201 tend not to disturb the vulnerable perimeter of support patch 201, where detachment from the subject's skin is especially likely to start. More detail about compliant connections between circuit carrier 208 and base layer 202 may be found in copending provisional U.S. patent application 61/241,713, filed Sep. 11, 2009 and titled “Electronics Integration in Adherent Patch for Physiologic Monitoring”, the entire disclosure of which is hereby incorporated by reference for all purposes.
[0062] In some embodiments, base layer 202, covering layer 203, or their combination may be breathable. For example, the combination of base layer 202 and covering layer 203 may have a moisture vapor transmission rate of at least 100 g/m2/day.
[0063] FIG. 5 illustrates an exploded view of an adherent device 500 in accordance with additional embodiments of the invention. Adherent device 500 includes several components similar to those in adherent device 100, and similar components are given the same reference numbers in FIG. 5 . Adherent device 500 may include different combinations of layers than adherent device 100.
[0064] Adherent device 500 comprises a support patch 501 that includes a base layer 502. Base layer 502 has an upper side 504 and a lower side 505. Lower side 505 includes an adhesive coating. At least one electrode, in this example four electrodes 207A, 207B, 207C, and 207D are affixed to base layer 502 and connected to flexible circuit 206. Besides being flexible, flexible circuit 206 may also be configured to be stretchable, for example due to its geometric configuration. In some embodiments, a portion of flexible circuit 206 may have a serpentine or sawtooth shape. Circuit carrier 208 holds electronic components 209, which may include an antenna 210. Electronic components 209 are electrically connected to electrodes 207A, 207B, 207C, and 207D and are configured to measure at least one physiologic signal of a subject to which adherent device 500 is adhered.
[0065] A stiffening structure 217 may be disposed over and coupled, directly or indirectly, to a perimeter area of base layer 502, to stiffen the perimeter edge of base layer 502. In some embodiments, a cover 213 is disposed over circuit carrier 208 and coupled at a perimeter 218 to base layer 502. In that case, stiffening structure 217 is disposed over and coupled to cover 213, and is therefore indirectly coupled to base layer 502. Cover 213 is preferably soft and flexible, and may be made of a material configured to inhibit liquids from reaching electronic components 209.
[0066] Similarly, in some embodiments, an overlayer 503 may be disposed above and adhered to base layer 502. Overlayer 503 is preferably thin, flexible, and stretchable, and may be made of a woven cloth or another suitable material. When overlayer 503 is present, stiffening structure 217 is also disposed over and coupled to the perimeter of overlayer 503, and stiffens at least the perimeter edges of the base layer and overlayer. All of the layers of a support patch such as support patch 501 or support patch 201 may be coextensive, having their edges aligned as was shown in FIG. 2C . Alternatively, one or more layers in a support patch may not be coextensive with the others. For example, overlayer 503 is slightly smaller than base layer 502, so that the edges of base layer 502 extend beyond the edges of overlayer 503. This arrangement may further reduce the stresses on the edge of base layer 502, thus promoting long adhesion to the subject to which adherent device 500 is adhered. This arrangement may be used in any of the embodiments described herein.
[0067] Adherent device 500 may comprise one or more gel patches 214A, 214B, 214C, and 214D, one gel disposed under each of electrodes 207A, 207B, 207C, and 207D. Gel patches 214A, 214B, 214C, and 214D enhance electrical conductivity between electrodes 207A, 207B, 207C, and 207D and the skin of a subject to which adherent device 500 is adhered.
[0068] In some embodiments, lower side 505 of base layer 502 is configured to adhere to the skin of a subject. In that configuration, gel patches 214A, 214B, 214C, and 214D are captured between base layer 502 and the subject's skin. Optionally, an underlayer 506 may be provided, adhered to lower side 505 of base layer 504, and configured to adhere to the skin of a subject. Preferably, underlayer 506 is also thin, flexible, and stretchable. For example, base layer 202, underlayer 506, or both may be made of MED 5021 polyurethane film available from Avery Dennison Corporation of Pasadena, Calif., USA, or Tegaderm™ film available from the 3M Company of St. Paul, Minn., USA. Other suitable materials may be used. Underlayer 506 may comprise openings 215A, 215B, 215C, and 215D, and may capture gels 214A, 214B, 214C, and 214D in pockets formed between base layer 502 and underlayer 506.
[0069] As in adherent device 100, adherent device 500 may include a compliant connection between circuit carrier 208 and base layer 502, for example a compliant connection as shown in FIG. 4 and described previously.
[0070] FIG. 6 illustrates an exploded oblique view of an adherent device 600 in accordance with additional embodiments of the present invention. In this embodiment, a support patch 601 may be configured to adhere to a subject's skin, and may be a support patch as in any of the embodiments described above. Support patch 601 may include a base layer, a covering layer, an overlayer, an underlayer, or any workable combination of these. Support patch 601 may include one or more electrodes (not visible in FIG. 6 ) electrically connected to a flexible circuit 206. A label 610 may be affixed to support patch 601. A circuit carrier 208 holds various electronic components 209, which may include a processor, memory, wireless communication circuitry, an antenna 210, and other electronic components. Adherent device 600 may also include a temperature or heat flux sensor 602. Bridging loops 603A, 603B, 603C (and a fourth bridging loop not visible in FIG. 3B ) are affixed to support patch 201 and to circuit carrier 208, and form a compliant structure that compliantly restrains motion of circuit carrier 208 with respect to support patch 601 in some degrees of freedom more stiffly than in other degrees of freedom. A housing 604 and protector 605 may insulate, cushion, or otherwise protect circuit carrier 208. The adherent device may further comprise a battery 606 or other energy source, a battery cover 607, a cover 608, and a display 609.
[0071] While exemplary embodiments have been described in some detail, by way of example and for clarity of understanding, those of skill in the art will recognize that a variety of modifications, adaptations, and changes may be employed. Hence, the scope of the present invention should be limited solely by the appended claims.
Claims
What is claimed is:
1. An adherent device to adhere to a skin of a subject, comprising: a stretchable base layer having an upper side and a lower side and an adhesive coating on the lower side to adhere the base layer to the skin of the subject, the base layer having at least two openings extending therethrough, each of the at least two openings having a size; a stretchable covering layer positioned above and adhered to the base layer with an adhesive to define at least two pockets, wherein the stretchable covering layer is thin, flexible, and configured to stretch with the skin of the subject; at least two gels, wherein each gel is positioned within one of the corresponding pockets, each gel having a size larger than the size of the at least two openings to retain said gel substantially within said corresponding pocket; a flexible circuit that includes at least two electrodes in contact with the at least two gels, the flexible circuit including a first portion located on the upper side of the stretchable base layer and a second portion that extends away from the first portion and through an opening in the stretchable covering layer; a circuit carrier positioned above the stretchable covering layer and supported with the stretchable base layer to measure at least one physiologic signal of the subject, wherein the circuit carrier is connected to the at least two electrodes via the second portion extending through an opening in the stretchable covering layer; and a compliant connection that includes a plurality of bridging loops formed between the upper side of the stretchable base layer and the circuit carrier that permits at least some movement of the circuit carrier in a plane parallel to the stretchable base layer.
2. An adherent device to monitor a subject having a skin, comprising: a stretchable base layer having an upper side and a lower side and an adhesive coating disposed on the lower side to adhere the base layer to the skin of the subject, the base layer having at least two openings extending therethrough, each opening having a size; a flexible circuit having at least two electrodes disposed thereon, each electrode positioned with a respective one of the at least two openings to couple to the skin of the subject the flexible circuit including a first portion located adjacent to the upper side of the stretchable base layer and a second portion that extends away from the stretchable base layer through an opening in a stretchable covering layer; at least two gels positioned with the at least two openings in the base layer, each gel having a size larger than the size of said each opening; the stretchable covering layer positioned above the at least two gels and adhered to the base layer, such that each gel is constrained substantially within a corresponding pocket disposed between the base layer and the covering layer, wherein the stretchable covering layer is thin, flexible, and configured to stretch with the skin of the subject; a circuit carrier positioned above the stretchable covering layer and holding electronic components electrically connected to the at least one electrode via the second portion of with the flexible circuit to measure at least one physiologic signal of the subject; and a compliant connection that includes a plurality of bridging loops formed between an upper side the stretchable base layer and the circuit carrier that permits at least some movement of the circuit carrier in a plane parallel to the stretchable base layer.
3. The adherent device of claim 2 wherein each of the gels and each of the pockets is sized larger than a corresponding opening of the stretchable base layer to retain said gel in said pocket when the stretchable base layer is adhered to the skin of the subject.
4. The adherent device of claim 2 wherein the stretchable base layer comprises a thin, flexible, stretchable base layer to stretch with the skin of the subject and conform to folds of the skin of the subject, and wherein the stretchable covering layer is configured to conform to folds of the skin of the subject.
5. The adherent device of claim 2, further comprising a thin, flexible, stretchable overlayer disposed above and adhered to the covering layer.
6. The adherent device of claim 2, wherein the first portion of the flexible circuit is formed of a substantially non-stretchable material, and has a serpentine, sawtooth, or other shape that geometrically configures the flexible circuit to be stretchable along a length of the adherent device.
7. The adherent device of claim 2, wherein the first portion of the flexible circuit is disposed between the base layer and the covering layer.
8. An adherent device, comprising:
a thin, flexible, stretchable base layer having an upper side and a lower side and an adhesive coating on the lower side to adhere to the skin of a subject;
at least one electrode affixed to the base layer and capable of electrically coupling to the skin of the subject;
a flexible circuit connected to the at least one electrode, wherein the flexible circuit includes a first portion located adjacent to the upper side of the stretchable base layer and a second portion that extends away from the first portion, wherein the second portion of the flexible circuit includes a loop shape to relieve strain when the stretchable base layer stretches with the skin of the subject;
a circuit carrier holding electronic components electrically connected to the at least one electrode via the second portion of the flexible circuit and configured to measure at least one physiologic signal of the subject;
a compliant connection that includes a plurality of loops formed between the upper side of the stretchable base layer and the circuit carrier that permits at least some movement of the circuit carrier in a plane parallel to the stretchable base layer, wherein the second portion of the flexible circuit extends around an outer circumference of one of the plurality of loops; and
a stiffening structure disposed above and coupled to a perimeter of the base layer and configured to stiffen the perimeter edge of the base layer, wherein the stiffening structure is removable.
9. The adherent device of claim 8, further comprising a thin, flexible, stretchable overlayer disposed above and adhered to the base layer, the stiffening structure disposed over and coupled to a common perimeter of the base layer and overlayer and configured to stiffen the perimeter edge of the base layer and overlayer.
10. The adherent device of claim 8, further comprising a gel patch under each electrode, wherein each gel patch enhances electrical conductivity between its respective electrode and the skin of the subject.
11. The adherent device of claim 8, wherein the flexible circuit is configured to be stretchable.
12. An adherent device, comprising:
a thin, flexible, stretchable base layer having an upper side and a lower side and an adhesive coating on the lower side configured to adhere to a skin of a subject;
at least one electrode affixed to the base layer and capable of electrically coupling to the skin of a subject;
a flexible circuit having a first portion located on the upper side of the stretchable base layer that is connected to the at least one electrode and a second portion that extends away from the stretchable base layer, wherein the first portion of the flexible circuit is formed of a substantially non-stretchable material, and has a serpentine, sawtooth, or other shape that geometrically configures the flexible circuit to be stretchable along a length of the adherent device, and wherein the second portion includes a loop shape to relieve strain when the stretchable base layer stretches with the skin of the subject;
a circuit carrier positioned above and coupled to the flexible circuit, the circuit carrier holding electronic components electrically connected to the at least one electrode via the second portion of the flexible circuit flexible circuit and configured to measure at least one physiologic signal of the subject; and
a compliant connection formed between the stretchable base layer and the circuit carrier that permits at least some movement of the circuit carrier in a plane parallel to the stretchable base layer.
13. The adherent device of claim 12, further comprising a gel patch under each electrode, wherein each gel patch enhances electrical conductivity between its respective electrode and the skin of the subject.
14. The adherent device of claim 12, further comprising a thin, flexible, stretchable overlayer disposed above and adhered to the base layer.
15. An adherent device to monitor a subject having a skin, comprising:
a stretchable base layer having an upper side and a lower side and an adhesive coating on the lower side to adhere the base layer to the skin of a subject, the base layer having at least two openings extending therethrough, each of the at least two openings having a size;
a stretchable covering layer positioned above and adhered to the base layer with an adhesive to define at least two pockets, wherein the stretchable covering layer is thin, flexible, and configured to stretch with the skin of the subject;
a flexible circuit comprising a first portion and a second portion, the first portion of the flexible circuit adhered between the stretchable base layer and the stretchable covering layer, the second portion having a loop shape that extends away from the first portion through an opening in the stretchable covering layer, wherein the first portion of the flexible circuit is formed of a substantially non-stretchable material, and has a serpentine, sawtooth, or other shape that geometrically configures the flexible circuit to be stretchable along a length of the adherent device;
at least two electrodes in contact with the first portion of the flexible circuit;
at least two gels, wherein each gel and each electrode are positioned within a corresponding pocket, each gel having a size larger than the size of the respective opening to retain said gel substantially within said pocket between the base layer and the covering layer; and
a circuit carrier positioned above the stretchable covering layer and supported with the stretchable base layer, the circuit carrier holding electronic components electrically connected to the at least two electrodes with the second portion of the flexible circuit to relieve strain when the stretchable base layer stretches with the skin of the subject, the electronic components configured to measure at least one physiologic signal of the subject.
16. An adherent device to adhere to a skin of a subject, comprising:
means for adhering to a skin of a subject, the means for adhering comprising a stretchable base layer having an upper side and a lower side and an adhesive coating on the lower side to adhere the base layer to the skin of a subject, the base layer having at least two openings extending therethrough, each of the at least two openings having a size, and the means for adhering further comprising a stretchable covering layer positioned above and adhered to the base layer with an adhesive to define at least two pockets, wherein the stretchable covering layer is thin, flexible, and configured to stretch with the skin of the subject;
a flexible circuit coupled to the means for adhering, the flexible circuit carrying at least two electrodes disposed on the flexible circuit and positioned to couple to the subject's skin, wherein the flexible circuit further includes a first portion located adjacent to the upper side of the stretchable base layer and a second portion that extends away from the flexible circuit and through an opening in the stretchable covering layer; and
means for enhancing electrical conductivity between the electrodes and the subject's skin,
a circuit carrier positioned above the stretchable covering layer and coupled to the at least two electrodes via the second portion of the flexible circuit, the circuit carrier holding circuitry to measure at least one physiologic signal of the subject; and
a compliant connection that includes a plurality of loops formed between the stretchable base layer and the circuit carrier that permits at least some movement of the circuit carrier in a plane parallel to the stretchable base layer.
17. The adherent device of claim 1, wherein the base layer, the adhesive coating, and the covering layer are coextensive.
18. The adherent device of claim 2, wherein the base layer, the adhesive coating, and the covering layer are coextensive.
19. The adherent device of claim 2, wherein the circuit carrier and the electronic components are comprised in a reusable electronics module.
20. The adherent device of claim 1, wherein the second portion of the flexible circuit includes a loop shape that extends around an outer circumference of one of the plurality of bridging loops.
21. The adherent device of claim 20, wherein the plurality of bridging loops connect to an inner portion of the stretchable base layer to prevent loads from being transferred to a perimeter of the stretchable base layer.
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