Surgery – Truss – Pad
Patent
1976-04-16
1977-08-16
Kamm, William E.
Surgery
Truss
Pad
128422, A61B 136
Patent
active
040419533
ABSTRACT:
A battery powered electronic circuit adapted for surgical implantation in the body of a patient suffering from intermittent heart block for providing electrical stimulation of the heart muscle upon detection of failure of normal heart activity. The circuit includes a pulse generator comprising an astable multivibrator which normally functions to produce a series of pulses of predetermined duration and at a predetermined repetition rate. The pulses are fed to a voltage doubler pulser which amplifies the pulses before they are applied through the output electrodes to the heart muscle. Also included in the system is an integrated circuit differential bandpass amplifier which is coupled to the output electrodes for amplifying the electrical output signal from the heart which is detected when ventricular contractions occur. The system further includes a level detector and a refractory one-shot multivibrator network. When the output from the amplifier occasioned by a natural heartbeat exceeds the threshold established by the level detector, the refractory one-shot multivibrator is triggered to produce a feedback control signal to the astable multivibrator and to the voltage doubler pulser circuit. The feedback control circuit resets the astable multivibrator and inhibits the voltage doubler pulser circuit from producing an artificial stimulating impulse.
REFERENCES:
patent: 3345990 (1967-10-01), Berkovits
patent: 3528428 (1970-09-01), Berkovits
patent: 3547127 (1970-12-01), Anderson
patent: 3661157 (1972-05-01), Fyson et al.
patent: 3908667 (1975-09-01), Bernstein
Anderson Jon A.
Kramp Richard W.
Cardiac Pacemakers Inc.
Haugen Orrin M.
Kamm William E.
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