Demand-type cardiac pacer having dynamic impedance switch

Details Demand-type cardiac pacer having dynamic impedance switch Demand-type cardiac pacer having dynamic impedance switch

1979-06-01

1981-04-14

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

042613655

ABSTRACT:
An improvement in a demand-type heart pace system in which the normally high input impedance of the R-wave sensing amplifier is reduced for a predetermined time interval following the generation of a heart stimulating impulse such that the charge on the pulse generator's voltage doubling capacitor following the generation of the stimulating impulse may more rapidly be restored to thereby prevent false detection of naturally occurring R-waves. Following the predetermined time interval, the input impedance of the R-wave amplifier is again returned to a high value in anticipation of the receipt of a natural R-wave signal following the completion of a refractory period. Digital logic circuitry is utilized for controlling the conduction state of semiconductor switches which are connected in parallel with the resistors normally establishing the amplifier's input impedance and the recharge path for the voltage doubling capacitor.

REFERENCES:
patent: 3835865 (1974-09-01), Bowers
patent: 4041953 (1977-08-01), Anderson et al.
patent: 4114627 (1978-09-01), Lewyn et al.
patent: 4170999 (1979-10-01), Allen et al.

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