US3923042A - Electrical detector/transducer/applicable on the skin surface for biometrical observations - Google Patents

Electrical detector/transducer/applicable on the skin surface for biometrical observations Download PDF

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Publication number
US3923042A
US3923042A US51070874A US3923042A US 3923042 A US3923042 A US 3923042A US 51070874 A US51070874 A US 51070874A US 3923042 A US3923042 A US 3923042A
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Prior art keywords
silver
surface
detector
grains
disc
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Expired - Lifetime
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Laszlo Hajdu
Gyorgy Hegyessy
Jozsef Balla
Gabor Vitan
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Medicor Muvek
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Medicor Muvek
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/04Detecting, measuring or recording bioelectric signals of the body or parts thereof
    • A61B5/0402Electrocardiography, i.e. ECG
    • A61B5/0408Electrodes specially adapted therefor
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2562/00Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
    • A61B2562/02Details of sensors specially adapted for in-vivo measurements
    • A61B2562/0209Special features of electrodes classified in A61B5/04001, A61B5/0408, A61B5/042, A61B5/0478, A61B5/0492 or A61B5/053
    • A61B2562/0215Silver or silver chloride containing

Abstract

Electrical detector to be fixed on the skin surface for biometrical observations, consisting of a silver silverchloride electrode and outlet placed in a casing, further of a biologically harmless ion conducting gel placed between the skin surface and the electrode, the electrode having a porous structure containing silver grains of less than 800 Mu m linear size and its density falling between 2 and 8 g/cm3, the surfaces of the individual silver grains being bound by cohesion to the surfaces of the adjacent silver grains, respectively to the surface of the outlet shaped from silver and the surfaces of the silver grains not participating at the cohesive binding being coated by a known silver-chloride layer.

Description

United States atent 1 91 1111 3,923,042 Hajdu et a1. Dec. 2, 1975 [54] ELECTRICAL 3,574,305 4 1971 Muhl 128 21 E DETECTOR/TRANSDUCER/APPLICABLE I l t v gkuc,hi....t....] 1/2 s 1;

, aric r.c a.... ON THE SKIN SURFACE FOR 3,747,590 7/1973 Motley l28/D1G. 4 BIOMETRICAL OBSERVATIONS 3,828,766 8/1974 Krasnow 128/21 E 175 Inventors; 1 5 16 Hajdu; Gyb-rgy HegyeSsy; 3,834,373 9/1974 Sato 128/206 E Jdzsef Balla; Gabor Vitfin, all of Budapest, Hungary Primary Examiner-Robert W. Michell Assistant Examiner-Lee S. Cohen [73] Asslgneez Medlcor Muvek, Budapest, Hungary Attorney, Agent or Firm Young & Thompson [22] Filed: Sept. 30, 1974 [57] ABSTRACT [2]] App. No" 510,708 Electrical detector to be fixed on the skin surface for biometrical observations, consisting of a silver silverl l F reign Application Priority Data chloride electrode and outlet placed in a casing, fur- Oct. 15.1973 Hungary ME 1674 ther Of a biologically harmless Conducting gel placed between the skin surface and the electrode, the [52] U.S. C1. 128/2116 E; 128/2 1 E; 128/417; electrode having a porous structure containing silver 128/1316 252/514 grains of less than 800 82m linear size and its density [51 Int. Cl. A61B 5/04 falling een 2 and 8 g/cm the surfaces of the indi- [58] Field of Search 128/206 E, 2.1 E, DIG. 4, vidual silver grains being bound y cohesion to the 128/417, 418, 404; 252/514 surfaces of the adjacent silver grains, respectively to the surface of the outlet shaped from silver and the [56] References Cit d surfaces of the silvergrains not participating at the co- UNITED STATES PATENTS hesive binding being coated by a known silver-chloride 3,490,440 1/1970 Mosieret a1. 128/2.l E layer 3,496,929 2/1970 Domingues 128/206 E 8 Claims, 2 Drawing Figures ELECTRICAL DETECTOR/TRANSDUCKER/APPLICABLE ON THE SKIN SURFACE FOR BIOMETRHCAL OBSERVATIONS The invention relates to an electrical detector which can be fixed to the skin surface, to be used for biometrical observations and in particular for electrocardiographic, e.g. electroencephalographic examinations.

The electrode incorporated in the detector has the task of picking up and transferring the potential appearing on the skin surface without any change in it. Since in the body we can speak of the second kindtransfer that is of ion transfer, the electrode transforms substantially the transfer of the second kind to a transfer of the first kind (to electron transfer). The most important requirement for the electrodes is the stability over a period of time of the potential of the electrode, i.e. prevention of the substantial polarization of the electrode. This can be achieved, as is known, by means of silver silver-chloride electrodes in conjunction with an electrolyte containing Cl'ions.

Besides the primary requirement, that is the stability of potential the electrode must possess between the electrolyte and the electron transferring outlet minimum contact resistance, the entire surface of the electrode must be equipolar. The electrolyte of Chen contents placed between the electrode surface and the skin surface must not irritate the skin surface even during extended use eg 48 72 hours and on the other hand it must preserve essentially its original concentration.

With the development of medical techniques, disposable medi cal appliances, including electrical detectors are gaining popularity at a steadily growing rate, due to their simple manoeuvrability and quick, hygienic applicability. Disposability sets another requirement for the electrical detectors. In the interests of quick and simple manipulation it is desirable that the electrode should be all ready for use with the electrolyte necessary for its proper functioning, and with means for ensuring its proper connection to the skin surface.-

In a known type of electrode, the material of the electrode consists of fine-grained pressed silver silverchloride mixture to which an electrical outlet is connected by soldering. The surface of the electrode formed this way will not be equipotential, since the individual silver grains are in contact with each other only through silver-chloride which isa bad electrical conductor. The currents flowing through the electrode which are of very low value produce voltage drops at different spots of the electrode surface which have a disturbing effect on the measurements. Leading out the current from a soldered joint can be the source additional problems, since in the presence of the electrolytic substance the soldering material may cause disturbing potentials, and the developing corrosion may disadvantageously influence the contact quality.

In another known construction of the silver silverchloride electrode an electrolytic silver-chloride coating is applied on the surface of a silver plate. The disadvantage of this construction is that firstly the high specific resistance of the solid silver-chloride increases the resistance of the electrode, and secondly the silverchloride does not adhere well on the surface of the silver and in aqueous substances, especially during extended examination periods particles of the silverchloride may separate, thus causing fluctuations in the potential. A further disadvantage of the plainsurface electrode is the fact that in comparison with electrodes of porous surface it has a surface smaller by several orders, therefore it is not well suited for examinations over extended periods, eg of 48 72 hours. The constantly increasing popularity of disposable electrical detectors is mainly due to their simple and quick applicability. The special requirements necessitated by disposability and in particular the ease of manufacturing required could not have been met with the known electrical detectors.

According to the present invention, there is provided an electrical detector, which can be fixed to the skin for biometrical observations, consisting of the silver silverchloride electrode housed in a casing with an outlet, and a biologically harmless ion conductinggel arranged between the skin surface and the electrodeQtheelectrode having a porous structure containing silver grains of less than 800 um linear size and with a density falling between 2 and 8 g/cm, the surfaces of the individual silver grains being bound by cohesion to the surface of adjacent silver grains and/or to the surface of the outlet which is also silver, the free surfaces of the silver grains being coated by the known silver-chloride layer.

The silver grains being bonded to each other provide for good conductivity of the electrode material and by this for the equipotential character. This formation of the electrode further maintains the very advantageous large homogenous surface, which reduces polarisation and ensures the stability of potential. Since the outlet is also made of silver, and the adjacent silver grains are bonded to it, a stable and safe electrical contact is obtained between the material of the electrode and the outlet.

The outlet can also be made of silver wire, which can be placed between the silver grains of the electrode.

Preferably, the outlet is a silver cup, which surrounds the electrode on three sides and there exists a cohesive bond between the inner surface of the cup and the silver grains of the electrode adjacent to the cup. The outlet can also form the housing of the electrode at the same time.

The ion transferring gel soaks into the pores of an elastic disc of porous structure and the disc extends from the electrode so that it is compressed when the electrode surface and the skin surface are in contact.

The cup with the electrode placed in it, and the disc soaked by the ion transferring gel may be surrounded by a disc of closed cell foam; a plastic annulus can be fastened to between the disc of the closed cell foam and the exterior of this cup. The surface of the closed cell foam disc in contact with the skin surface can be coated by a biologically harmless adhesive layer.

A bell can be fixed to the external surface of the silver cup and the disc of closed cell foam will be held between the bell and the plastic annulus.

When the detector is adapted to be used once only, the adhesive coated surface of the disc of closed cell foam is made suitably of polyethylene and covered by a protective paper of silicon lining. The protective paper hermetically seals the disc soaked by-the conductive gel, thus protecting it from drying. Before use the paper cover must be removed from the surface of the disc.

The electrical detector may be placed in a hermetically sealed container containing saturated water vapour.

The invention will now be described in more detail. by way of example, with reference to the accompanying drawing, in which:

FIG. 1 represents the scheme of the electrode structure connected to the outlet,

FIG. 2 is a simplified sectional drawing of a disposable electrode.

In FIG. 1, the grain structure of the electrical detector (transducer) according to the invention is shown. Electrode 4 is formed by silver grains 1 connected to each other and silver grains 13 connected also to the outlet. Owing to the porous structure of the electrode, only specific parts of the surfaces of the silver grains 1, 13 are connected to each other. The silver grains 1 have edge portions 2 along which the silver grains are connected to each other by cohesive bonding. Silver grains 13 adjacent to the outlet are connected along edge portions 14, also by cohesive bonding, to the outlet made of silver. The size of silver grains 1, 13 is less than 800 ,u.m and the density of the material of the electrode in this embodiment was 3.5 g/cm The free surfaces of silver grains 1, 13 are coated by a silverchloride layer.

In FIG. 2, an embodiment of the electrical detector according to the invention is shown, which has been designed to be used once and then discarded.

In this case the outlet of the electrode 4 is a cup 6 made of silver, which surrounds the electrode 4 on three sides. The external flange of cup 6 joins to the inner surface of a plastic annulus 7 and this annulus 7 also forms the seat for a disc made of porous plastic foam. A metallic bell 12 is attached by solid binding to the outside of cup 6. In the space between bell 12 and annulus 7 a plastic foam disc 8 of closed cell structure is situated. On the surface of plastic foam disc 8 which will be in contact with the skin, a known adhesive coat 9, which will not dissolve in water, is put on so that the electrode can be attached to the skin. In this embodiment plastic foam disc 8 of closed cell structure has been made of polyurethane with a diameter of 50 mm and a thickness of 3 mm. The adhesive coating 9 applied to the disc can be any glue not harmful to the human organism and non-soluble in water, for instance glue of poly-isobutylene base.

A plastic foam disc 5 is placed in the interior of annulus 7 and its thickness exceeds the depth of the recess in annulus 7 and consequently the external'surface of disc 5 protrudes beyond the external flange of annulus 7. Disc 5 is soaked in a gel containing Cl'ions and is harmless to the human organism. The gel utilized can contain, for example, 1% of Cl, 6% of glycerine, and 1% of carboxy-methyl-cellulose. The other components of the gel can be various perfume substances, e.g. lemon oil, further distilled water.

Before use, the surface coated by layer 9 of disc 8 is protected by a multi-layer protective paper 10, the surface of the paper in contact with the layer 9 being for instance a silicone lining, which will not adhere to the glue.

The electrode is placed in a hermetically sealed multilayer bag containing saturated water vapour and this bag has at least one polythene layer and one aluminum foil layer. The ion conducting gel contained in disc 5 and stored in the bag containing saturated water vapour does not dry out for a long time.

When the electrode is to be used, the bag is opened and protective paper 10 is removed from plastic foam disc 8, thereafter the electrical detector is placed on the skin surface to be examined, and is held there by the adhesive layer 9. When placed on the skin, plastic foam disc 5 is compressed and the ion conducting gel stored in it establishes a safe electrical contact between the skin surface and the electrode 4. Since the ion conducting gel is encircled by a hermetically sealed surface it cannot evaporate and, once in place, the electrode provides for an excellent connection for several days.

Electrical connection between the detector according to the invention and the examining device can be established by a contactor of suitable design attached to the external surface of bell 12, for instance by the connector as detailed in our Hungarian Patent Application with base no. ME-1673. Due to its advantageous properties the electrode according to the invention is outstanding among the detectors of known designs: its stability of potential, contact resistance, stability in time is remarkably better than those of the electrodes known up to now. From the simple design it is also evident, that the production costs of the detector are moderate too.

What we claim is:

1. An electrical detector to fix to the skin for biometrical observations, comprising an electrically conductive housing defining a cavity having an open side and having a silver inner surface, a coherent porous body of silver grains compressed in said housing substantially filling the cavity and having cohesive bonds between contacting silver surfaces of said grains and between said grains and said housing surface, and a coating of silver chloride on the surfaces of substantially all-of said grains other than said contacting surfaces.

2. A detector as claimed in claim 1, said housing comprising a silver cup that encompasses said grains on three sides.

3. A detector as claimed in claim 2, and an elastic disc of open cell porous structure soaked with an ionconducting gel and closing the open side of said housing and projecting beyond said housing to contact the surface of the skin.

4. A detector as claimed in claim 2, and a plastic annulus encircling the cup, and a closed cell foam disc having a surface secured to and extending beyond said annulus said foam disc including means for attaching the disc surface to the skin.

5. A detector as claimed in claim 4, and a metallic bell secured to the external surface of said cup, said form disc being gripped between the bell and the annulus.

6. A detector as claimed in claim 4, said attaching means including a protective paper layer covering the surface of the foam disc, and an adhesive releaseably securing said paper to said foam disc.

7. A detector as claimed in claim 1, said grains being of less than 800 um linear size and having a density from 2 to 8 g/cm".

8. A detector as claimed in claim 1, and a biologically harmless ion conducting gel being disposed on the open side of the housing and in contact with the silver grains.

Claims (8)

1. AN ELECTRICAL DETECTOR TO FIX TO THE SKIN FOR BIOMETRICAL OBSERVATIONS, COMPRISING AN ELECTRICALLY CONDUCTIVE HOUSING DEFINING A CAVITY HAVING AN OPEN SIDE AND HAVING A SILVER INNER SURFACE, A COHERENT SAID HOUSING SUBSTANTIALLY FILLING THE CAVITY AND HAVING COHESIVE BONDS BETWEEN CONTACTING SILVER SURFACES OF SAID GRAINS AND BETWEEN SAID GRAINS AND SAID HOUSING SURFACE, AND A COATING OF SILVER CHLORIDE ON THE SURFACES OF SUBSTANTIALLY ALL OF SAID GRAINS OTHER THAN SAID CONTACTING SURFACES.
2. A detector as claimed in claim 1, said housing comprising a silver cup that encompasses said grains on three sides.
3. A detector as claimed in claim 2, and an elastic disc of open cell porous structure soaked with an ion-conducting gel and closing the open side of said housing and projecting beyond said housing to contact the surface of the skin.
4. A detector as claimed in claim 2, and a plastic annulus encircling the cup, and a closed cell foam disc having a surface secured to and extending beyond said annulus said foam disc including means for attaching the disc surface to the skin.
5. A detector as claimed in claim 4, and a metallic bell secured to the external surface of said cup, said form disc being gripped between the bell and the annulus.
6. A detector as claimed in claim 4, said attaching means including a protective paper layer covering the surface of the foam disc, and an adhesive releaseably securing said paper to said foam disc.
7. A detector as claimed in claim 1, said grains being of less than 800 Mu m linear size and having a density from 2 to 8 g/cm3.
8. A detector as claimed in claim 1, and a biologically harmless ion conducting gel being disposed on the open side of the housing and in contact with the silver grains.
US3923042A 1973-10-15 1974-09-30 Electrical detector/transducer/applicable on the skin surface for biometrical observations Expired - Lifetime US3923042A (en)

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CA (1) CA1037127A (en)
DE (1) DE2449091B2 (en)
FR (1) FR2247724B1 (en)
NL (1) NL7413489A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4556066A (en) * 1983-11-04 1985-12-03 The Kendall Company Ultrasound acoustical coupling pad
US4787390A (en) * 1987-04-15 1988-11-29 Scovill Japan Kabushiki Kaisha Electrode sensor
US20030153822A1 (en) * 2000-04-27 2003-08-14 Brian Nielsen Method for reducing decomposition during strorage of s skin electrode
WO2003079897A2 (en) * 2002-03-26 2003-10-02 Del Re Riccardo Brun Skin impedance matched biopotential electrode
US20040070446A1 (en) * 2001-02-13 2004-04-15 Krupka Michael Andrew Low noise, electric field sensor
US20040254435A1 (en) * 2003-06-11 2004-12-16 Robert Mathews Sensor system for measuring biopotentials
US20050073322A1 (en) * 2003-10-07 2005-04-07 Quantum Applied Science And Research, Inc. Sensor system for measurement of one or more vector components of an electric field
US20050275416A1 (en) * 2004-06-10 2005-12-15 Quasar, Inc. Garment incorporating embedded physiological sensors
US20060015027A1 (en) * 2004-07-15 2006-01-19 Quantum Applied Science And Research, Inc. Unobtrusive measurement system for bioelectric signals
US20060041196A1 (en) * 2004-08-17 2006-02-23 Quasar, Inc. Unobtrusive measurement system for bioelectric signals
US20090227856A1 (en) * 2007-12-21 2009-09-10 Brian Keith Russell Electrocardiogram sensor
US20150038955A1 (en) * 2011-11-16 2015-02-05 Pantec Biosolutions Ag Skin contact detecting device for a device to be secured

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3139953A1 (en) * 1981-10-08 1983-04-28 Nicolay Gmbh Method of producing an electrode and electrode produced by said method

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3490440A (en) * 1967-01-05 1970-01-20 Nasa Pressed disc type sensing electrodes with ion-screening means
US3496929A (en) * 1967-03-30 1970-02-24 Ind Medical Instr Inc Pellet-type biopotential electrode with buffer disc
US3574305A (en) * 1967-09-09 1971-04-13 Hellige & Co Gmbh F Electrode serving for the detection of electrophysiological potentials or currents
US3685645A (en) * 1970-08-17 1972-08-22 Physio Control Corp Defibrillation electrode pad and package therefor
US3701346A (en) * 1971-01-04 1972-10-31 Bionetics Inc Medical electrode
US3747590A (en) * 1971-06-21 1973-07-24 Nat Cable Molding Corp Biopotential electrode
US3828766A (en) * 1972-08-14 1974-08-13 Jet Medical Prod Inc Disposable medical electrode
US3834373A (en) * 1972-02-24 1974-09-10 T Sato Silver, silver chloride electrodes

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3490440A (en) * 1967-01-05 1970-01-20 Nasa Pressed disc type sensing electrodes with ion-screening means
US3496929A (en) * 1967-03-30 1970-02-24 Ind Medical Instr Inc Pellet-type biopotential electrode with buffer disc
US3574305A (en) * 1967-09-09 1971-04-13 Hellige & Co Gmbh F Electrode serving for the detection of electrophysiological potentials or currents
US3685645A (en) * 1970-08-17 1972-08-22 Physio Control Corp Defibrillation electrode pad and package therefor
US3701346A (en) * 1971-01-04 1972-10-31 Bionetics Inc Medical electrode
US3747590A (en) * 1971-06-21 1973-07-24 Nat Cable Molding Corp Biopotential electrode
US3834373A (en) * 1972-02-24 1974-09-10 T Sato Silver, silver chloride electrodes
US3828766A (en) * 1972-08-14 1974-08-13 Jet Medical Prod Inc Disposable medical electrode

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4556066A (en) * 1983-11-04 1985-12-03 The Kendall Company Ultrasound acoustical coupling pad
US4787390A (en) * 1987-04-15 1988-11-29 Scovill Japan Kabushiki Kaisha Electrode sensor
US20030153822A1 (en) * 2000-04-27 2003-08-14 Brian Nielsen Method for reducing decomposition during strorage of s skin electrode
US20040070446A1 (en) * 2001-02-13 2004-04-15 Krupka Michael Andrew Low noise, electric field sensor
US7088175B2 (en) 2001-02-13 2006-08-08 Quantum Applied Science & Research, Inc. Low noise, electric field sensor
WO2003079897A2 (en) * 2002-03-26 2003-10-02 Del Re Riccardo Brun Skin impedance matched biopotential electrode
WO2003079897A3 (en) * 2002-03-26 2004-02-05 Del Re Riccardo Brun Skin impedance matched biopotential electrode
US20050177038A1 (en) * 2002-03-26 2005-08-11 Hans Kolpin Skin impedance matched biopotential electrode
US6961601B2 (en) 2003-06-11 2005-11-01 Quantum Applied Science & Research, Inc. Sensor system for measuring biopotentials
US20040254435A1 (en) * 2003-06-11 2004-12-16 Robert Mathews Sensor system for measuring biopotentials
US7141987B2 (en) 2003-10-07 2006-11-28 Quantum Applied Science And Research, Inc. Sensor system for measurement of one or more vector components of an electric field
US20050073302A1 (en) * 2003-10-07 2005-04-07 Quantum Applied Science And Research, Inc. Integrated sensor system for measuring electric and/or magnetic field vector components
US20070159167A1 (en) * 2003-10-07 2007-07-12 Hibbs Andrew D Integrated sensor system for measuring electric and/or magnetic field vector components
US20050073322A1 (en) * 2003-10-07 2005-04-07 Quantum Applied Science And Research, Inc. Sensor system for measurement of one or more vector components of an electric field
US7141968B2 (en) 2003-10-07 2006-11-28 Quasar Federal Systems, Inc. Integrated sensor system for measuring electric and/or magnetic field vector components
US7173437B2 (en) 2004-06-10 2007-02-06 Quantum Applied Science And Research, Inc. Garment incorporating embedded physiological sensors
US20050275416A1 (en) * 2004-06-10 2005-12-15 Quasar, Inc. Garment incorporating embedded physiological sensors
US20060015027A1 (en) * 2004-07-15 2006-01-19 Quantum Applied Science And Research, Inc. Unobtrusive measurement system for bioelectric signals
US7245956B2 (en) 2004-07-15 2007-07-17 Quantum Applied Science & Research, Inc. Unobtrusive measurement system for bioelectric signals
US20060041196A1 (en) * 2004-08-17 2006-02-23 Quasar, Inc. Unobtrusive measurement system for bioelectric signals
US20090227856A1 (en) * 2007-12-21 2009-09-10 Brian Keith Russell Electrocardiogram sensor
US20150038955A1 (en) * 2011-11-16 2015-02-05 Pantec Biosolutions Ag Skin contact detecting device for a device to be secured

Also Published As

Publication number Publication date Type
DE2449091B2 (en) 1979-09-20 application
FR2247724A1 (en) 1975-05-09 application
CA1037127A (en) 1978-08-22 grant
DE2449091A1 (en) 1975-04-17 application
FR2247724B1 (en) 1980-03-28 grant
NL7413489A (en) 1975-04-17 application
CA1037127A1 (en) grant

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