Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3848582 A
Publication typeGrant
Publication dateNov 19, 1974
Filing dateJul 10, 1972
Priority dateJul 10, 1972
Publication numberUS 3848582 A, US 3848582A, US-A-3848582, US3848582 A, US3848582A
InventorsKerwin R, Milani D
Original AssigneeMedical Res Labor Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Portable electrocardiographic signal apparatus
US 3848582 A
Abstract
A battery powered cathode ray oscilloscope which is sufficiently small and lightweight to be hand held is provided on the backside thereof with electrodes for pressing against a patient's chest whereby to cause an electrocardiographic signal to be displayed on the cathode ray screen.
Images(2)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

States atent [191 ilani et a1.

[451 Nov. 19, 1974 PORTABLE ELECTROCARDIOGRAPli-HC SIGNAL APPARATUS Inventors: Dean L. Milani, Highland Park;

Richard G. Kerwin, Prospect I-lgts., both of 111.

Medical Research Laboratories, Inc., Des Plaines, 111.

July 10, 1972 Assignee:

Filed:

Appl. No.:

US. Cl. 128/206 R, 128/206 E, 128/D1G. 4 Int. Cl A61b 5/04 Field 011 Search 128/205 P, 2.05 R, 2.05 S, 128/206 A, 2.06 E, 2.06 F, 2.06 G, 2.06 R, 2.1 E, DIG. 4; l78/DIG. 29, 7.8; 313/87, 89, 92 R; 315/10, 30

References Cited UNITED STATES PATENTS 4/1951 McIntyre et a1 128/21 E 3,212,496 10/1965 Preston 128/206 R 3,419,745 12/1968 3,608,543 9/1971 Longini et a1. 128/21 E 3,706,308 12/1972 John et a1. 128/206 R FOREIGN PATENTS OR APPLICATIONS 250,557 11/1966 Austria 128/206 R Primary Examiner-William E. Kamm Attorney, Agent, or Firm-Robert M. Wolters A battery powered cathode ray oscilloscope which is sufficiently small and lightweight to be hand held is provided on the backside thereof with electrodes for pressing against a patients chest whereby to cause an electrocardiographic signal to be displayed on the cathode ray screen.

ABSTRACT 4 Claims, 10 Drawing Figures PAIENIE NOV 1 9 I974 SHEET 1 OF 2 PORTABLE ELECTROCARDIOGRAPHIC SIGNAL APPARATUS The human heart puts out an electrical signal of approximately 1 millivolt upon beating. Electrical signals commonly are picked up from the chest of a patient by electrodes making good contact with the skin on the chest by means of an electro-gel. Preferably the electrodes are arranged in a triangular pattern know an the Eindhoven triangle. The two outer, upper electrodes comprise pickup electrodes, while the lower central electrode is a ground electrode. The two upper electrodes serve as differential input electrodes to a differential amplifier circuit. The prior procedures have required relatively long electrode leads which are prone to picking up external electrical noises, and since the heart signal is of rather low potential, it is essential that the electro-gel be used to make good contacts, whereby to apply as high a signal-to-noise ratio to the inputs of the electrocardiograph machine as is reasonably possible.

The pattern which a normal human heart makes upon beating is well known, and has been known for many years. Electrocardiograms commonly have been made for many years'by the use of a moving paper web and a pen leaving an impression thereon. Many cycles of heartbeat are recorded in this manner, and can be studied carefully by a doctor for any possible malfunction of the heart. However, such examination is time consuming, and hence costly, and requires cumbersome equipment, whereby electrocardiograms are not commonly made unless some heart problem is expected, or unless the patient is having an extensive physical exam.

It is known that a cathode ray oscilloscope can be substituted for the moving pen type of recording apparatus for making electrocardiograms, whereby there is an instant display. However, this again requires the use of expensive and cumbersome machinery with long lead wires, and with the necessity of electro-gel to make a good contact between pickup electrodes and the skin of the patients chest. Thus, the taking of an electrocardiogram is discouraged unless it is thought to be essential for some reason. This is not wise, as it would be ideal to take an electrocardiogram frequently of any patient whose health is less than the best, in the same manner that temperature and blood pressure readings are now taken. Those skilled in the medical art will realize that an electrocardiogram can be far more significant in revealing cardiovascular difficulties than can the simple temperature and blood pressure tests.

Accordingly, in accordance with the present invention, it is proposed to provide novel apparatus comprising a small cathode ray oscilloscope, having a tube face for display of about 2 inches by El inches. The total depth of the apparatus is on the order of 6 to 8 inches. The apparatus is battery powered and is provided with a hand grip or handle so that it readily can be supported by a doctor or technician. Pickup electrodes are provided directly on the back of the cathode ray oscilloscope unit, whereby leads are surpassingly short. Furthermore, the leads and the entire electrical apparatus are shielded by being housed in a metallic case. Accordingly, it is not necessary to use the electro-gel to insure proper contact, since a useful signal can be obtained of lower magnitude than heretofore, and since additional amplification is of no particular problem since amplifier stages are relatively cheap and since the signal-to-noise ratio is quite high due to the substantial total exclusion of noise signals.

The present invention will best be understood with reference to the accompanying drawings and the following specification, wherein:

FIG. 1 is a perspective view illustrating the application of the apparatus of the present invention to the chest of a patient;

Fig. 2 is a side view of an apparatus constructed in accordance with the present invention;

FIG. 3 is a back view thereof as taken from the left end of FIG. 2;

FIG. 4 is a back view similar to FIG. 3 but showing a different type of electrode arrangement;

FIG. 5 is another back view showing yet another electrode arrangement;

FIG. 6 is a back view similar to FIG. .5 showing a still further electrode arrangement;

FIG. 7 is an enlarged fragmentary sectional view taken along the line 77 in FIG. 3 showing a detail of electrode mounting;

FIG. 8 is a view similar to FIG. 7 taken along the line 8-8 in FIG. 5; FIG. 9 is a fragmentary side view of the apparatus showing a modified form of handle or hand grip; and

FIG. 10 is a similar view showing a modification for AC or line current operation.

An electrocardiographic unit constructed in accordance with the principles of the present invention is shown at 20 in FIGS. 1-3. The unit or apparatus comprises primarily a cathode ray oscilloscope including a sheet metal housing 22 of rectangular frontal construction, and somewhat trapezoidal top and side views. The total length from front to back is on the order of 6 to 8 inches. The apparatus is provided with .a cathode ray tube having a display surface of face 24 on the order of two inches by three inches. Control knobs are provided at 26, and a light sensitive device 28, preferably a cadmium selenide cell is provided on the front to control the brightness of the cathode screen display in accordance with ambiant room lighting.

The apparatus is provided on its underside with a pistol grip 30 so that it can readily be held by the hand 32, as of a doctor, and pressed against the chest 34 of a patient. A trigger 36 is provided behind the pistol grip 30 for depression by the index finger to activate the apparatus to provide the cathode ray screen with the desired readout of the heartbeat. An envelope of a normal heartbeat is shown in broken lines at 38, the scale being too small to reproduce the pulses displayed by a normal heartbeat.

The apparatus is provided on its back with three electrodes 40, 42 and 44. These are respectively the right side and left side electrodes (also known as negative and positive electrodes) and an indifferent electrode. These electrodes project only a very short distance from the rear of the apparatus so as to minimize problems of noise pickup.

Preferably, as shown in FIG. 7, each electrode, the electrode 40 being exemplary, is provided in the form of a disc 46 having a boss 48 on the rear thereof and having a socket therein cooperating with 'a ball 50 on the end of a shaft 52. The shaft projects from the rear wall 54 of the apparatus, and is resiliently urged outwardly thereof by a spring 56 encircling the shaft and trapped between an abutment 58,'such :as a "C washer on the shaft and a depending stop 60 within the housing. A lead wire 62 extends from the inner end of the shaft 52 to the input of the electronic circuitry, illustrated as black boxes 64 and 66 in broken lines in FIG. 2. The cathode ray tube 68 having the face or display screen 24 also is shown in broken line outline in FIG. 2.

Reference heretofore has been made to construction of the case or housing 22 of metal for shielding purposes. As will be understood, the same ends can be attained by different means, such as by use of a molded plastic housing with a foil lining or conductive paint on the inner surface thereof.

A two lead pickup rather than a three lead pickup is shown in FIG. 4. In this figure the parts remain the same as heretofore described, similar numerals being used with the addition of the suffix a. The distinction is, that instead of having the three electrodes in the Eindhoven triangle, as illustrated in Fig. 3, there are but two electrodes 44a and 42a, respectively being the indifferent electrode and the positive electrode. Again, the electrodes preferably have a ball and socket mounting and are spring biased to form the firm engagement with the chest of a patient.

A further modified electrode structure is shown in Fig. 5, the parts which are similar again being identified by similar numerals, this time with the addition of the suffix b. In this instance, the positive electrode 42b is centrally located, and has spaced from it a negative electrode 40b concentric therewith. Outwardly of the negative electrode and also in spaced relation therefrom and concentric therewith is a yet larger ring comprising the indifferent electrode 44b. In FIG. 8 there will be seen a structure similar to that in Fig. 7 for supporting the electrodes of FIG. 5, only the support for the outer ring or indifferent electrode 44b being shown. There are four arcuately spaced shafts or rods 52b supporting the ring 44b, each being outwardly biased by a spring 56b compressed between a stop 58b on the shaft and a fixed stop 60b in the housing. Thus, as in the previous figures, structure is provided for firmly, yet resiliently, and hence comfortably postioning the electrodes against the patients chest. A somewhat modified electrode display is shown in FIG. 6, this again being a two lead pickup as distinguished from a three lead pickups of FIGS. 3 and 5. The positive pickup in this instance comprises a ring 42c having in spaced, insulated relation thereto and concentrically outwardly therefrom an indifferent electrode 440. The structure otherwise remains the same.

The pistol grip 30 shown in FIG. 2 is fixed angular relation relative to the case or housing. A modification of the structure is shown in FIG. 9, similar parts being identified by similar numerals with the addition of the suffic d. A handle 30d is mounted on a depending flange 65 by means ofa threaded stud 67 having a wing nut 69 thereon. Upon loosening of the wing nut, the handle 30d may be arranged to any desirable or comfortable position, as illustrated by the single solid line and two broken line positions of FIG. 9. Subsequent tightening of the wing nut 69 on the threaded stud 67 locks the handle in the desired adjusted position.

It is intended that for utmost portability and electrical safety, the present apparatus should be battery operated. However, it is contemplated that in some instances it would be desired to use line cord or AC operation. A modification to this end is shown in FIG. 10,

similar numerals again being used with the addition of the suffix e. The distinguishing feature of FIG. 10 is that the pistol grip handle 30e is provided with a line cord extending from the lower end thereof. and leading up through the handle into the housing for attachment to a power supply unit to operate the electronic circuits and the cathode ray tube therein.

Due to the small size and light weight of the present apparatus, and also due to the mounting of the electrodes directly thereon and the preferred battery operation, it is a simple matter for a doctor to carry such an apparatus with him, and to take a quick electrocardiographic signal of a patient as routinely as blood pressure and temperature and pulse rate are taken. Since the apparatus can be constructed relatively inexpensively as electronic medical apparatus goes, and since little additional time is required for the taking of the instantaneous electrocardiographic signal, the added cost to the patient for the taking of an electrocardiographic signal along with the measuring of pulse rate, blood pressure, and temperature is of inestimable benefit both to the patient and to the doctor.

The specific examples of the invention as herein shown and described are for illustrative purposes only. Various changes in structure will no doubt occur to those skilled in the art, and will be understood as forming a part of the present invention insofar as they fall within the spirit and scope of the appended claims.

The invention is claimed as follows:

1. A portable electrocardiographic signal apparatus comprising a housing, a display screen on the front of said housing, pickup electrode means carried by said housing on the back thereof and positioned externally thereof for placement against a patients chest, mounting means for said electrode means extending into said housing, spring means mounted internally of said housing and bearing on said mounting means resiliently to bias said electrode means outwardly of said housing, positive stop means in said housing acting on said mounting means to limit outward movement of said electrode means, means in said housing engaging and laterally stabilizing said mounting means and hence said electrode means, electronic circuitry means in said housing interconnecting said electrode means and said display screen, and pistol grip means on and extending down from the bottom of said housing substantially centrally thereof for normal gripping of said pistol grip means by one hand of an operator to support said housing in one hand with said pickup electrode means against a patients chest and said screen disposed toward said operator in ready viewing position for said operator to display an instantaneous electrocardiographic signal.

2. A portable apparatus as set forth in claim 1 including means for adjusting said pistol grip relative to said housing.

3. A portable apparatus as set forth in claim 1 and further including light sensitive means on the exterior of said housing interconnected with the electronic circuitry means of said apparatus to control the brightness of display of said screen.

4. A portable apparatus as set forth in claim 3 wherein said display screen and said light sensitive means are on the front face of said housing and the electrodes are on the back of said housing.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2549836 *Jun 14, 1946Apr 24, 1951Dunn Arthur LElectrode-carrying headgear for electroencephalographic analysis
US3212496 *Aug 21, 1962Oct 19, 1965United Aircraft CorpMolecular physiological monitoring system
US3419745 *May 17, 1967Dec 31, 1968Licentia GmbhElectron-optical image-reproducing system with power supply voltage regulated according to ambient light
US3608543 *Oct 3, 1968Sep 28, 1971Univ Carnegie MellonPhysiological impedance-measuring apparatus
US3706308 *Oct 19, 1970Dec 19, 1972Neuro Data IncLife detecting medical instrument
AT250557B * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4015596 *Jun 25, 1975Apr 5, 1977Hugo Sachs Elektronik KommanditgesellschaftApparatus for detecting and indicating electrical body potentials
US4084583 *Apr 7, 1976Apr 18, 1978Siemens AktiengesellschaftMethod and apparatus for measuring the bioelectrical activity under an electrode resting on a patient
US4127114 *Aug 30, 1976Nov 28, 1978Carba S.A.Apparatus for the automatic measurement of the arterial pressure of a patient
US4281659 *Mar 12, 1979Aug 4, 1981Roche Medical Electronics Inc.Applying and securing percutaneous or transcutaneous probes to the skin especially for fetal monitoring
US4350164 *Jun 3, 1980Sep 21, 1982Allain Jr Joseph LPortable, life monitor, medical instrument
US4362164 *Sep 11, 1980Dec 7, 1982Hughes Aircraft CompanyElectronic pick-up device for transducing electrical energy and sound energy of the heart
US4375219 *Apr 22, 1980Mar 1, 1983Walter SchmidElectrode for detecting bioelectrical signals
US4432367 *Mar 3, 1982Feb 21, 1984Piesinger Gregory HFor receiving electric impulses produced by the heart muscle
US4478225 *Dec 2, 1982Oct 23, 1984Ewing John GHeart monitor for horses
US4535783 *Aug 1, 1983Aug 20, 1985Kontron Holding A.G.Personal electrocardiology recorder
US4540001 *Sep 20, 1984Sep 10, 1985Ewing John GHeart monitor for horses
US4606352 *Jul 13, 1984Aug 19, 1986Purdue Research FoundationPersonal electrocardiogram monitor
US4697599 *Feb 10, 1986Oct 6, 1987William WoodleyApparatus for locating and detecting pain
US4809705 *Oct 8, 1985Mar 7, 1989Gilles AscherPortable electrocardiogram monitor
US4981141 *Feb 15, 1989Jan 1, 1991Jacob SegalowitzWireless electrocardiographic monitoring system
US5168874 *Aug 21, 1990Dec 8, 1992Jacob SegalowitzWireless electrode structure for use in patient monitoring system
US5307818 *Jul 7, 1992May 3, 1994Jacob SegalowitzWireless electrocardiographic and monitoring system and wireless electrode assemblies for same
US5375604 *Dec 11, 1992Dec 27, 1994Siemens Medical Electronics, Inc.Transportable modular patient monitor
US5566676 *Dec 11, 1992Oct 22, 1996Siemens Medical Systems, Inc.Pressure data acquisition device for a patient monitoring system
US6221012Jan 6, 1995Apr 24, 2001Siemens Medical Electronics, Inc.Transportable modular patient monitor with data acquisition modules
US6385473Apr 15, 1999May 7, 2002Nexan LimitedPhysiological sensor device
US6416471Apr 15, 1999Jul 9, 2002Nexan LimitedPortable remote patient telemonitoring system
US6450953Apr 15, 1999Sep 17, 2002Nexan LimitedPortable signal transfer unit
US6454708Jun 9, 2000Sep 24, 2002Nexan LimitedPortable remote patient telemonitoring system using a memory card or smart card
US6494829Apr 15, 1999Dec 17, 2002Nexan LimitedPhysiological sensor array
US6772004Oct 19, 2001Aug 3, 2004Case Western Reserve UniversitySystem and method for non-invasive electrocardiographic imaging
US6975900Dec 12, 2002Dec 13, 2005Case Western Reserve UniversitySystems and methods for determining a surface geometry
US6996428 *Feb 18, 2004Feb 7, 2006Gen3 Partners, Inc.Biological signal sensor and device for recording biological signals incorporating the said sensor
US7016719Oct 4, 2002Mar 21, 2006Case Western Reserve UniversitySystem and methods for noninvasive electrocardiographic imaging (ECGI) using generalized minimum residual (GMRes)
US7471973Apr 21, 2005Dec 30, 2008Case Western Reserve UniversityDetermining a surface geometry of an object
US7647093 *Aug 19, 2004Jan 12, 2010New Cardio, Inc.Apparatus and method for cordless recording and telecommunication transmission of three special ECG leads and their processing
US20090182205 *Jan 8, 2009Jul 16, 2009Cho Jae GeolMobile terminal for measuring biological signal
CN102368949BDec 3, 2009Feb 19, 2014株式会社村田制作所Cardiac signal detection device
EP0178990A1 *Oct 9, 1985Apr 23, 1986Gilles AscherPortable electrocardiogram recorder
EP1985231A1 *Dec 12, 2006Oct 29, 2008Omron Healthcare Co., Ltd.Portable electrocardiograph
EP2724664A1Sep 3, 2013Apr 30, 2014Biotechware S.r.l.Portable electrocardiograph
WO1988005282A1 *Jan 21, 1988Jul 28, 1988Micromedical Ind Pty LtdPortable physiological monitor
Classifications
U.S. Classification600/372, 600/525
International ClassificationA61B5/0404, A61B5/0402, A61B5/044
Cooperative ClassificationA61B5/0404, A61B5/044
European ClassificationA61B5/044, A61B5/0404