Surgery – Truss – Pad
Patent
1977-05-31
1978-09-19
Kamm, William E.
Surgery
Truss
Pad
128419D, 128419PT, S61N 136
Patent
active
041146280
ABSTRACT:
A implantable ventricular stimulating, ventricular sensing, inhibited heart pacer providing electronically generated stimulating pulses of varying energies depending upon the heart response. The frequency of these pulses is set at a selected rate in the absence of a natural heart beat. Stimulating pulses are inhibited once the natural electrical signal corresponding to ventricular pumping rate (R wave rate) exceeds the selected rate. The output circuit comprises an up-down counter in conjunction with a digital-to-analog converter and output amplifer. An electronic oscillator creates pacing pulses to trigger the output circuit, thus producing the stimulating pulses. Each pacing pulse increments the counter and simultaneously initiates a refractory period control circuit. An electromechanical transducer detects mechanical heart response which is gated to the up-down counter during the refractory period to decrement the counter.
REFERENCES:
patent: 3618615 (1971-11-01), Greatbatch
patent: 3638656 (1972-02-01), Grandjean et al.
patent: 3716059 (1973-02-01), Welborn et al.
patent: 3805795 (1974-04-01), Denniston et al.
patent: 3865119 (1975-02-01), Svensson et al.
patent: 3920024 (1975-11-01), Bowers
patent: 3949758 (1976-04-01), Jirak
patent: 4041953 (1977-08-01), Anderson et al.
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