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Publication numberUS2611368 A
Publication typeGrant
Publication dateSep 23, 1952
Filing dateJan 10, 1950
Priority dateJan 10, 1950
Publication numberUS 2611368 A, US 2611368A, US-A-2611368, US2611368 A, US2611368A
InventorsLouis J Pecora
Original AssigneeLouis J Pecora
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
German silver electrocardiograph contact electrode
US 2611368 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Sept. 23, 1952 L. J. PECORA 2,611,368

GERMAN SILVER ELECTROCARDIOGRAPH CONTACT ELECTRODE Filed Jan. 10, 1950 lNVENTOR BY Z 00/5 J PLFCOPA ATTORNEY Patented Sept. 23, 1952 2,611,368). GERMAN SILVER,.ELEoTRoeAniiroGR rn{ i v CONTACT ELEGTRQDE V -Iloui'sfJ'. Pecora,'jGarrett Park,-.Md.,-.ass ig-nor. to :the -.United:': States of America, asrepresented, V .bythe Administrator, FederaILSecurityAgency .TAPPlication January 10, 195 Se'rial N0;137,832 I roman. (Cl. 128 5-4 18) wide The invention described herein may be manufactured and used by or for the Government of the United States for governmental purposes without the payment to me of any royalty thereon in accordance with the provisions of the act of April 30, 1928 (Ch. 460, 45 Stat. L. 467).

This invention relates to a self-tensioning electrode for electrocardiographs, and more par-v ticularly to such an electrode adapted to be used in connection with small experimental animals, such as for example, rats, mice, cats, dogs or the like.

Heretofore in the making of electrocardiograms of small animals during research procedures, various expedients such as fine needles inserted subcutaneously, or tight wrappings of wire or the like, have been attempted to be used; but the resulting pain and discomfort to the animal has resulted in the production of unsatisfactory electrocardiograms or in interferences, artefacts and distortions which are undesirable. This invention accordingly has for an object the production of an electrode adapted to engage the '.the act di tit an- 3,- mea -as amenaeaaprirso, 1928; 370 0'. G. 751) eminently suited for this purpose.

this invention, and referring now to the drawing, there is provided electrical contacting means for engaging the limb of a rat or the like which may take the form of a fiat contact member I having a generally arcuate surface. The contact member I is preferably made of a metal which has a low electrical resistance and which is not corroded by the usual salt pastes employed for securing electrical conductivity. It has been found that German-silver, an alloy composed of about 18% nickel, 56% copper and 26% zinc, is Connected to the contact member I is an insulated and shielded copper wire 2 of a size adapted to carry limb of a small animal with a minimum of pain and discomfort while at the same time being capable of providing an intimate electrical contact capable of transferring theminute currents generated by the animal heart during its normal functioning. Other objects will be apparent or will appear hereinafter as the ensuing description proceeds.

These objects are accomplished in accordance with this invention which provides a self-tensioning electrode for electrocardiograph machines wherein a German-silver contact member is provided with a, shielded electrical insulating lead and opposed to said contact member there is provided an insulating clamping member adapted for movement toward and away from said contact member, the two members being connected to each other through a U-shaped spring having a pair of double-offset fingers, said spring urging said fingers toward each other, one of said fingers being connected to said clamping member and the other finger being connected through an insulating block to said contact member whereby said spring upon expansion urges said clamping member toward said contact member and the limb of a small animal engaged between said members can be uniformly pressed by the contact member.

For a better understanding of this invention, reference is made to the single figure of the accompanying drawing wherein is shown an isometric view of a device in accordance with this invention. For a practical embodiment of the minute currents of electricity contemplated. In general it has been found that the wire 2 may be of the type such as is used for phonograph pick-up arm cable or any other suitable electrical conductor may be employed. The wire 2 is retained in electrical contact with the member I by means of a block of insulation 3 and a pair of retaining screws 4.

Adjacent to the contact member I and the block 3 is a clamping member 5 which is at its outer extremity shaped in an arcuate fashion to form a mirror image of the contact member I. The clamping member 5 is made of a suitable electrically insulating material and is adapted to move toward and away from the contact member-l. Connected to the clamping member 5 and the contact member I through the block'3 is a fiat U-shaped spring 6 having a pair of double-offset fingers 1 and 8 which, upon release of the spring 6 are adapted to urge the contact member I and the clamping member 5 toward each other with a tension adapted to secure good electrical contact while at the same time insufficient to injure an experimental animal. For convenience, the wire 2 may be retained at a point intermediate its length by strap 9 fastened to the spring 6 near the apex of the U. From this point the wire 2 is connected to the amplifier of an electrocardiograph machine, not shown, in the customary manner.

In the operation of the device, it is only necessary to compress the spring 6 whereby the contact member which is separated from the clamping member '5 and the paw or limb of the experimental animal is inserted therebetween. Upon release of the spring 6, the limb is closely engaged by the clamping member 5 and the contact I. If desired, any of the usual electropastes may be employed to secure a more efficient contact between the limb of the animal and the electrode.

Various changes can be made in the details of the invention as above described without departing from its spirit and scope, as defined in the appended claim as ultimately allowed.

What is claimed is:

A self-tensioning electrode for electrocardiographs which comprises a, single German-silver contact member, an electrical lead directly connected thereto, an electrically insulated clamping member opposed to said contact member and adapted for movement toward and away from said contact member. and a' U-shaped spring having a pair of double-offset fingers, one of said fingers being connected to said clamping member and the other finger. being connected, through insulation, to said contact member, said spring being adapted to urge said clamping member toward said contact member; whereby said contact member is adapted to be uniformly 4' pressed against the limb 01. a small animal engaged between said members.

LOUIS J. PECORA.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 837,599 Williams Dec. 4, 1906 1,492,657 Walker May 6, 1924 1,452,194 Dasinberre Apr. 17, 1927 1,686,842 Bulbivant Oct. 9, 1928 FOREIGN PATENTS Number Country Date v 553,256 France Feb. 7, 1923 937,306 France Mar. 8, 1948

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US837599 *Mar 8, 1906Dec 4, 1906John H WilliamsTest-clamp.
US1452194 *Jun 22, 1921Apr 17, 1923Dusinberre George BElectrical testing clip
US1492657 *Oct 2, 1922May 6, 1924Walker Herbert EClip jaws
US1686842 *Dec 17, 1924Oct 9, 1928Valley Electric CompanyElectrical connecter
FR553256A * Title not available
FR937306A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3067749 *Feb 27, 1961Dec 11, 1962Walters Max LElectrode limb clamps
US3120227 *Jul 8, 1960Feb 4, 1964Robert J BraunlinMethod for obtaining a fetal electrocardiogram
US3478303 *Dec 9, 1966Nov 11, 1969Dauser William CElectrical connector
US3800784 *Jul 11, 1972Apr 2, 1974Medicor MuevekMedical instrument for examining a fetus during delivery
US3882850 *May 9, 1973May 13, 1975Bailin HowardBrain wave feedback instrument
US4580576 *Jan 17, 1984Apr 8, 1986Chiltern International LimitedECG recorder
US4612936 *Aug 28, 1984Sep 23, 1986Fukuda Denshi Co., Ltd.Clip-type electrode for electrocardiographs
US4644956 *Oct 15, 1984Feb 24, 1987Jurgen MorgensternPhysiological test probe
US4781197 *May 27, 1986Nov 1, 1988Fukuda Denshi Co., Ltd.Clip type electrode for electrocardiographs
US4979511 *Nov 3, 1989Dec 25, 1990Cyberonics, Inc.Strain relief tether for implantable electrode
US5209679 *May 15, 1992May 11, 1993Graphic Controls CorporationAdaptive medical electrode connector with male stud
US20070004979 *Jul 16, 2002Jan 4, 2007Alex WojciechowiczClip and method for epicardial placement of temporary heart pacing electrodes
US20130324827 *May 31, 2013Dec 5, 2013Dennis BurkettAtraumtic Clamp-Type Electrode Contact
Classifications
U.S. Classification600/396, 600/386, 439/829
International ClassificationA61N1/04
Cooperative ClassificationA61N1/04, A61B5/0408
European ClassificationA61B5/0408, A61N1/04