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Publication numberUS3109430 A
Publication typeGrant
Publication dateNov 5, 1963
Filing dateJan 29, 1959
Priority dateJan 29, 1959
Publication numberUS 3109430 A, US 3109430A, US-A-3109430, US3109430 A, US3109430A
InventorsMorris Tischler
Original AssigneeElectronic Aids Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Cardiac nerve control device
US 3109430 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Nov. 5, 1963 M. TISCHLER 3,109,430

CARDIAC NERVE CONTROL DEVICE Filed Jan. 29, 1959 IN VENTOR 0 Morris r/sm/er BY Mm L?2%4/ ATTORNEY United States Patent O areasso CARDIAC NERVE CONTROL DEVICE Morris Tischlcr, Baltimore, Md, assignor to Electronic Aids, Inc, Baltimore, Md., a corporation oi Maryland Filed Jan. 29, 1959, Ser. No. 789,989 2 Claims. (til. 128 -422) This invention relates generally to surgical apparatus, and more particularly it pertains to electrical impulse generators for stimulating the cardiac nerves.

It is well known that the muscles of a body can be caused to react to an electrical stimulus. For this purpose, various electrical generators have been devised and used in the art.

An important special adaptation of this principle of electrical stimulus has been the application of regularly spaced electrical pulses to the cardiac nerves for reviving a faltering heart beat. Inasmuch as a great many cases of this sort are of an emergency nature, it is not always possible to have at hand the necessary apparatus IfOI treatment of a patient.

In order to be fully prepared for emergency cardiac nerve treatment of the patient of either the open or closed chest type, a physician needs a versatile, selfpowered, compact and light weight instrument which can be included in his emergency kit.

lit is an object of the present invention, there-fore, to provide a battery-supplied, transistor-operated pulse generating heart stimulator including repetition rate control and amplitude control of a generated unidirectional pulse and having provisions for either open or closed chest electrode use.

Other objects of this invention are to provide a novel transistorized heart stimulator which is compact, which is economical to manufacture, efiieient and reliable in operation, and which is easy to maintain.

These and other objects and advantages of this invention will become more readily apparent and understood irom the accompanying specification and single FIGURE which illustrates a schematic diagram of a transistorized heart stimulator.

A junction type tnansistor 19, as depicted schematically in the drawing, is arranged in a blocking oscillator circuit. This circuit includes a capacitor 12 and a reactor 14 connected serially between the base electrode 16 and emitter electrode 18 of the transistor 10.

A supply capacitor 20, charged through a resistor 22 from a battery 24, is provided in the circuit to furnish operating current to the collector electrode 26 and to the emitter electrode 18 through a charging choke coil 28. A variable base biasing resistor 30 and a limiting resistor 32 are provided in the circuit as shown and are serially connected between the base electrode 16 and the collector electrode 26.

A coupling capacitor 34 is also provided in the circuit to effectively connect a resistive potentiometer 36 across the charging choke coil 28. A selected portion of the current developed across potentiometer 36 is fed by means of a variable tap 38 to a base electrode 42 of a second junction transistor 40 arranged in an emitter follower circuit.

Bias current is supplied through the potentiometer .36 to the base electrode 42 from the positive side of the supply capacitor 20. The negative side of the capacitor is connected to the collector electrode 44 of the second junction transistor 40.

The emitter electrode 46 of transistor is connected to a low tap 48 of an autotransformer 50' which has its common connection '52 connected to the positive side of the supply capacitor 20.

3,199,430 Patented Nov. 5, 1963 ice Between an intermediate tap 54 and the common tap 52 of the autotransformer 56), there is provided a rectifier diode 56. A two position switch 60 is provided in the circuit to select the voltage provided by the autotransformer 56 either from the intermediate tap 54 or a high voltage tap 58 therefor for a pair of application electrodes 62. Electrodes 62 can be in the form of chest plates, if desired.

A switch 64- as well as a current monitoring jack 66 is provided in the circuit in series with the battery 24. A lamp 68 is connected across the charging choke 28, and it is used to give a visual indication of the generated pulse which may also be monitored at a test point 79.

In actual operation or the transistorized heart stimulator, the electrodes are positioned in the proper position on the chest of the patient. The repetition rate of the blocking oscillator transistor 10 is then adjusted as desired by the base biasing resistor 30. The amplitude of the voltage discharge from the electrodes 62 is adjusted by the potentiometer tap 38. High voltage or low voltage for closed or open chest cardiac stimulation, respectively, is chosen by means of the switch 60. Diode 56 suppresses oscillations and assures unipotential pulse output.

Obviously, many other modifications of the present invention are possible in the light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.

What is claimed is:

1. A cardiac nerve control device, comprising a battery, a transistorized blocking oscillator circuit to translate the power supplied by said battery into electrical impulses and having means to control the frequency of said impulses, means coupled to said blocking oscillator circuit to control the amplitude and shape of said inrpulses to form an electrical signal having the efi'ect of stimulating normal action of the heart when applied to the nerves and/or muscles thereof, a transistorized emitter-follower circuit coupled to said last mentioned means to receive and amplify said signal, means including a step-up autotransformer coupled to said emitter-follower circuit to receive said signal and vary its voltage to high and low levels for closed and open chest heart stimulation, respectively, and a pair of spaced electrodes to apply the output of said step-up autotransformer to the nerves and/or muscles of the heart.

2. The cardiac nerve control device of claim 1 and in addition a unilaterally conducting element coupled 0 to said step-up autotransformer for suppressing spurious oscillations and assuring a unipotential pulse output of said step-up autotransformer.

References Cited in the file of this patent tronic Engineering, pp. 188 190.

Denny: Chronaxie Meter, June 1944 Electronic Engineering, pp. 26-28.

Molyneux article, Electronic Engineering, March 1957, pages -127.

Her-rod et al. article, Surgery, September 1952, pages 510-511. (Copy in Division 55.)

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2004751 *Mar 23, 1931Jun 11, 1935H G Fischer & CompanyLow voltage generator
US2295585 *Sep 16, 1939Sep 15, 1942Robert J LindquistTherapeutic current and means for producing the same
US2764683 *Apr 18, 1952Sep 25, 1956Physical Medicine Products CoLow voltage electro-therapy generator
US2830578 *Jan 31, 1957Apr 15, 1958Mark E DegroffElectro-sonic apparatus
US2848992 *Aug 30, 1955Aug 26, 1958Gerard PigeonApparatus for controlling the pulse
US2915066 *Jul 24, 1956Dec 1, 1959Casther SaApparatus for producing an excitation applicable in electro-stimulotherapy
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3180338 *Jan 6, 1961Apr 27, 1965Relaxacizor IncElectronic muscle stimulator
US3198195 *Oct 18, 1962Aug 3, 1965William M ChardackImplantable controls for cardiac pacemakers
US3236239 *Jul 17, 1962Feb 22, 1966American Optical CorpDefibrillator
US3373747 *Apr 28, 1967Mar 19, 1968Gen Medical CoElectrical muscle stimulator device and razor attachment therefor
US3454012 *Nov 17, 1966Jul 8, 1969Esb IncRechargeable heart stimulator
US3554198 *Aug 4, 1967Jan 12, 1971Cardiac Electronics IncPatient-isolating circuitry for cardiac facing device
US3638656 *Aug 14, 1969Feb 1, 1972Liechti Ag FredMethod and apparatus for monitoring and stimulating the activity of the heart
US3726285 *Apr 26, 1971Apr 10, 1973Gen ElectricBody organ stimulus pulse generator with decoupled timing circuit and voltage multiplier
US4084595 *Jul 15, 1976Apr 18, 1978Med General, Inc.Transcutaneous nerve stimulator
US4124030 *Jan 5, 1977Nov 7, 1978Roberts Wallace AElectro-therapeutic faradic current generator
DE1296283B *Sep 29, 1964May 30, 1974 Title not available
EP0080536A1 *Dec 2, 1981Jun 8, 1983Walter SpaaCardiac stimulator
U.S. Classification607/12, 607/10
International ClassificationA61N1/362
Cooperative ClassificationA61N1/362
European ClassificationA61N1/362