WO1997004703A1 - Disposable electro-dermal device - Google Patents
Disposable electro-dermal device Download PDFInfo
- Publication number
- WO1997004703A1 WO1997004703A1 PCT/US1996/012100 US9612100W WO9704703A1 WO 1997004703 A1 WO1997004703 A1 WO 1997004703A1 US 9612100 W US9612100 W US 9612100W WO 9704703 A1 WO9704703 A1 WO 9704703A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- connector device
- inches
- receptor
- conductive
- distance
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
- A61B5/28—Bioelectric electrodes therefor specially adapted for particular uses for electrocardiography [ECG]
- A61B5/282—Holders for multiple electrodes
Definitions
- This invention relates to a disposable medical device employing electrical signals to monitor or stimulate various parts of the body. More particularly the present invention involves a device for establishing electrical connection to a patient's skin containing a fixed array of conductive paths of substantially the same electrical resistance for use with an electrocardiological measuring apparatus.
- Prior art medical electrodes generally are combination structures including a metallic or otherwise conductive support member to which an electric wire from an assorted apparatus may be attached.
- electrocardiograms sometimes referred to as an EKG or ECG have ten cable leads which attach to various points on the upper and mid-torso of a patient to measure and analyze cardiac data.
- the person responsible for attaching the cable leads of the EKG often has problems in attaching these multiple leads to the patient because the cable leads may tangle with one another or may become detached before they are all connected. Accurately placing and securing a large number of leads can be difficult and time consuming and requires the knowledge of a skilled technician or physician.
- Periodic electrocardiograms can provide a cardiographic profile of a patient for early detection and diagnosis of cardiovascular diseases. For purposes of providing an accurate profile, it is important that each electrocardiogram be taken with sensors affixed at the same location on the patient. The accuracy of the reproducible results is critical so that a series of electrocardiograms can be compared, between testing episodes, to provide a continuing profile of a patient for diagnosis and treatment of heart disease.
- U.S. Patent No. 4,328,814 to Arkam teach a plurality of electrodes attached to a single junction connector having one cable leading to the EKG device.
- This device is designed for an adult patient so that patients having larger or smaller torsos will have difficulty in using the device because the electrodes cannot be easily adjusted to accommodate a smaller or larger torso.
- the plurality of electrodes must be disconnected from the EKG device by disconnecting the main connectors and then detaching the plurality of the electrodes. No electrodes remain on the patient to monitor the heart attack.
- U.S. Patent No. 4,353,372 to Ager discloses a plurality of electrodes which plug into a junction box connected to an EKG machine.
- Each of the electrodes includes wires molded into a central cable system which joins the junction box.
- This device does not include means for quickly attaching or removing the electrodes. For example, in an emergency situation if the electrodes must be removed quickly, the junction box must be disconnected first and then each of the electrodes must be detached.
- each electrode has a wire lead from the main molded cable, which may permit some adjustment in the placement of the electrodes on the upper portion of a human torso, the device is not entirely adequate for large adults or very small children because of the limited adjustment of each electrode.
- U.S. Patent No. 4,608,987 to Mills relates to a vest-like garment having a plurality of apertures adapted for receiving associated electrodes.
- the vest is not tailored for a specific patient and proper fit is provided by adjustable straps which may be secured by VELCR0 R material. Therefore, there is no assurance that the electrodes are placed at the same anatomical location upon reuse with the same patient.
- U.S. Patent No. 3,910,260 describes telephonic units for transmitting ECG signals to ECG receiving equipment which could be at a hospital or a physician's office. The transmission may take place in emergency vehicles where prior medical history may not be readily available. In order to obtain meaningful and reliable data ECG signals are necessary for the care providers. None of the prior art devices have disclosed a low cost solution for obtaining repeatable placement of sensors for accurate and readable ECG signals in the field by unskilled individuals.
- the present invention in the broadest sense involves a disposable non-conducting flexible sheet incorporating a fixed array of electrical conducting strips emanating from a terminus that can connect to a standard electrocardiographic cable or telemetric unit .
- the strips are used as both collectors and as transmitters for electrical impulses.
- Conventional sensory electrodes are optional since the device can function without them.
- the invention relates to a disposable, electro-dermal connector device comprising: a flexible non-conductive sheet comprising a fixed array of electrical conductor strips affixed thereto having a receptor pad end and a terminal connection end said array positioned in the configuration normally used for electrocardial recording whereby the flexibility of said connector and adhesion of the surface of the flexible sheet to skin are substantially enhanced.
- Each strip includes a first end portion or receptor end adapted for electrical connection with the skin for receiving electrical impulses.
- a second end portion terminates in a common electrical connection or cable junction which is adapted for connection with a standard type of cable junction for connection with the electrocardiograph device.
- the conductive strips may be printed on the single layer non-conductive film or sheet by any conventional printing or silk screening type of process.
- the portion of the strip which need not be exposed can be coated or covered with a non- conductive coating or adhesive material which can be cured.
- Conductor strips which are less than 10 micrometers in thickness which provide enhanced flexibility without distorting the electrical signal.
- the invention relates to a disposable electro-dermal connector device comprising: a flexible non- conductive sheet comprising a fixed array of electrical conductor strips affixed thereon and positioned in a specific size configuration normally used for standard electrocardial recording, said conductor strips having a receptor pad end adapted for electrical connection with the skin for receiving electrical impulses and a terminal connection end which is adapted for connection with an electrocardiological measuring apparatus, wherein receptor pads V- . and V 2 are attached approximately on either side of the sternum at the fourth intercostal space and receptor pad V 3 is attached over the fifth intercostal space midway between V 2 and V 4 .
- V 5 is equidistant between V 4 and V 6 .
- the distance between "v ⁇ and V 2 , V 2 and V 3 and V 4 is about 1.75 inches ⁇ 0.56 inch.
- FIG. 1 shows a preferred device of the present invention for attachment to the torso of a patient.
- FIG. 2 shows a preferred embodiment of the present invention of properly positioning the device on a patient.
- FIG. 3 illustrates the first step in the method for determining the size of the device to be used on a patient according to this invention.
- FIG. 4 shows the second step in the method for determining the size of the device to be placed on a patient according to this invention.
- FIG. 1 illustrates the electro-dermal connector device 10 of the present invention for placement on the chest of a patient comprising flexible non-conducting sheet 11 incorporating multiple conductor strips 12 for connection to a standard electrocardiographic receiving unit.
- the non-conducting sheet 11 includes conductor strips 12 which form end sensors or receptor 22 which are positioned on the sheet and spaced relative to each other whereby each receptors 22 is positioned in a specific size configuration normally used for electrocardial recordings .
- Each strip 12 includes a first end portion or receptor 22 adapted for electrical connections with the skin for receiving and transmitting electrical impulses generated by the body. A second end of each strip 12 or the terminal connector end 23 to engage a common electrical connection or cable junction (not shown) for connection with the electrocardiograph device (not shown) .
- an electrically conductive ion containing a biocompatible adhesive gel is applied to the body contacting side of sheet 11 at each receptor 22 of connector 12 for adhesion to the skin of the patient for providing electrical connection between each of the precordial ends and the terminal end 23 connected to the proper receiving devices (not shown) .
- the adhesive gel coated area of connector device includes at least one release liner in releasable adhesive contact with the gel.
- Each of the conductor strips 12 are less than 10, preferably less than 5 micrometers in thickness whereby the flexibility of the connector and adhesion of the gel surface to the skin are substantially enhanced.
- FIG. 1 shows the connector array (V 1# V 2 , V 3 , V 4 , V 5 , and V 6 ) on flexible sheet 11 which is designed to adhere to a human torso so that the terminal ends 22 are located below the sternal notch, over the ribs and at the side of the torso.
- the flexible sheet 11 can be substantially transparent and includes an opening in the proximate center which is intended to span the upper portion of the sternum of the patient.
- the sheet may include indicia adjacent to or on each of the conductor strips to facilitate correct placement of the receptors on the precordial areas of the human torso.
- FIG. 2 illustrates the position of the electro-dermal connector device 10 as it is properly positioned upon a patient.
- the connector device 10 is generally attached by adhering the precordial receptors.
- the receptors V- . and V 2 are attached approximately on opposite sides of the sternum at the fourth intercostal space.
- Pads V 3 and V 4 are attached over the ribs.
- Pads V 5 and V s are placed at the side of the torso so that V 5 is midway between V 4 and V 6 . For small sizes the distance between V 4 and V 6 is on the average 3.5 inches, for medium 5.0 inches and for large 7 inches.
- the contour of the electro-dermal connector 10 is configured to conform substantially to the shape of a human trunk.
- a preferred laminate of the invention comprises the following layers: a) a flexible non-conductive film of polyethylene terphthalate; b) a catalyst layer in contact with silver ink; c) a connector strip in contact with silver ink; d) a dielectric layer in contact with silver ink and silver chloride receptor layer superimposed upon the silver ink layer; e) a conductive hydrogel layer superimposed upon the silver chloride receptor layer; and f) a flexible release liner as the top layer superimposed upon the conductive hydrogel.
- the flexible non-conductive web or sheet 11 may be formed from any non-conductive flexible natural or synthetic sheet material which is capable of accepting a print .
- any cellulosic material, polyester, polyolefin, polyvinyl chloride, nylon or mixtures thereof would be suitable.
- cotton, polypropylene, polyethylene can be used because of cost.
- Polyethylene terphthalate is most preferred.
- the polymer sheet material may be color coded for specific body areas or may contain an outline and/or color markings to simplify the electro-dermal connector device.
- the device of this invention is designed to include the use by an untrained or trained individual . This device allows an untrained person including the patients themselves to provide highly reliable and repeatable ECG signals.
- the receptors 12 can be produced from any electrically conductive material, e.g., metals, conductive polymers, graphite, carbon fibers and the like. Conductive materials such as gold, copper, silver, tin, aluminum, N-vinyl pyrrolidone and alloys or mixtures thereof maybe used.
- the receptors can be made of metal foil or made from a conductive paste of a metal in particle form in a suitable binder which is printed or silk screened onto the flexibly non-conductive sheet.
- the connective polymer may be heat pressed or otherwise conventionally adhered to the web or sheet.
- copper strips are electrolessly deposited on the polymeric sheets in a range from about 0.25 to about 5 microns, more preferably from 0.25 to 1.5 microns and most preferably 0.4 microns in thickness.
- the exposed conductive strips may be partially coated with a dielectric polymeric material so that only selective portions are exposed, Suitable dielectric coatings include polyesters, ethylene-vinyl acetate copolymers, polyvinyl chloride and its copolymers, terpolymers such as acrylonitrile-butadiene styrene (ABS resins) and inter alia.
- ABS resins acrylonitrile-butadiene styrene
- One form of metallic ink which may be used is a silver ink is commercially available and marketed by Dupont Chemical Corp. of Wilmington, Delaware under the tradename Composition 9793.
- the conductive adhesive hydrogel is sold commercially by Lee Tec Corporation of Eden Prairie, MN. Other suitable conductive adhesives are manufactured by 3M Corporation of St. Paul, MN. Although an adhesive hydrogel is preferred any commercial electro-dermal adhesive would be operable. Preferably the area size of the hydrogel is between about 3 and 9 square centimeters.
- the flexible release liner may be made from a suitable dielectric film which includes polyesters, olefinic polymers, polyvinyl chloride and its copolymers, acrylic rubbers, ABS resin and the like.
- the electro-dermal connector device 10 comprises at least six gel contact areas and is adapted for use in electrocardiography.
- the electro-dermal connector device 10 is available in sizes to accommodate any size adult person. It has been found that the distance between pads V 1 to V 4 is constant for all sizes. The separation of 1.75 inches will accommodate all adults with a tolerance of plus or minus 0.56 inch at each pad. It has also been found that body placement for pads V 5 and V 6 vary depending on individual size.
- FIG. 4 shows a method of determining the proper size. The measurement from the V 4 position to V 6 position determines the size of the device. As illustrated in FIG. 4 this measurement is the distance determined between the thumb and the middle finger and then matched to a scale provided. The table below corresponds to the illustrated scale.
- the distance between V 4 to V 6 will be determined by the size of the patient, that is, the size of the vest.
- the distance between V 4 and V 6 is about 2.5 to 4.5 inches with the centering of V 5 being at about 1.75 inches
- the medium vest has a distance of about 4.0 to 6.0 inches with the centering of V 6 being about 2.5 inches
- the large vest the distance is about 6.0 to 8.0 inches with the centering being about 3.5 inches .
- V 1; V 2 , V 3 and V 4 are all positioned the same.
- the center of V 2 is located on a radius of 0.825 inches from a point 1.75 inches ⁇ 0.56 inches from the center of V 2 on the 270 (90) degree radial from the center of V 2 wherein the radial is measured with zero degrees from the top of the device.
- the center of V 3 is located within a radius of 0.825 from a point 1.75 inches ⁇ 0.56 inches from the center V 2 on the top 236 (56) degree radial from the center of V 2 .
- the center of V 4 is located within a radius of 0.825 inches from a point 3.5 inches from the center V 2 on the 236 (56) degree radial from the center of v 2 .
- a typical dimensional layout for 5 and V 6 relative to V 4 is as follows:
- V and V 2 The distance between V and V 2 is 1.75 inches, the distance between sternum and V 4 along a horizontal line is 3.85 inches with V 3 along a horizontal line being equidistant from V 2 and V 4 .
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69632202T DE69632202T2 (en) | 1995-07-28 | 1996-07-23 | ELECTRICAL DISPOSABLE DEVICE |
CA002228124A CA2228124C (en) | 1995-07-28 | 1996-07-23 | Disposable electro-dermal device |
JP50768097A JP3789136B2 (en) | 1995-07-28 | 1996-07-23 | Disposable dermatoelectric device |
AU65070/96A AU6507096A (en) | 1995-07-28 | 1996-07-23 | Disposable electro-dermal device |
AT96924679T ATE264087T1 (en) | 1995-07-28 | 1996-07-23 | ELECTRODERMAL DISPOSABLE DEVICE |
EP96924679A EP0874583B1 (en) | 1995-07-28 | 1996-07-23 | Disposable electro-dermal device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US50892895A | 1995-07-28 | 1995-07-28 | |
US08/508,928 | 1995-07-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997004703A1 true WO1997004703A1 (en) | 1997-02-13 |
Family
ID=24024638
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1996/012100 WO1997004703A1 (en) | 1995-07-28 | 1996-07-23 | Disposable electro-dermal device |
Country Status (8)
Country | Link |
---|---|
US (6) | US5916159A (en) |
EP (1) | EP0874583B1 (en) |
JP (1) | JP3789136B2 (en) |
KR (1) | KR100461856B1 (en) |
AT (1) | ATE264087T1 (en) |
AU (1) | AU6507096A (en) |
DE (1) | DE69632202T2 (en) |
WO (1) | WO1997004703A1 (en) |
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Also Published As
Publication number | Publication date |
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US6219568B1 (en) | 2001-04-17 |
DE69632202D1 (en) | 2004-05-19 |
KR19990035929A (en) | 1999-05-25 |
EP0874583A1 (en) | 1998-11-04 |
ATE264087T1 (en) | 2004-04-15 |
US5865741A (en) | 1999-02-02 |
EP0874583B1 (en) | 2004-04-14 |
US6157851A (en) | 2000-12-05 |
US5916159A (en) | 1999-06-29 |
JP3789136B2 (en) | 2006-06-21 |
DE69632202T2 (en) | 2005-04-21 |
EP0874583A4 (en) | 1999-10-27 |
US6219569B1 (en) | 2001-04-17 |
JPH11510073A (en) | 1999-09-07 |
US6066093A (en) | 2000-05-23 |
KR100461856B1 (en) | 2005-04-14 |
AU6507096A (en) | 1997-02-26 |
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