Demand cardiac pacemaker with input circuit portion of increased

Details Demand cardiac pacemaker with input circuit portion of increased Demand cardiac pacemaker with input circuit portion of increased

1974-12-16

1976-12-28

Kamm, William E.

Surgery

Truss

Pad

330138, A61N 136

Patent

active

039995569

ABSTRACT:
A demand cardiac pacemaker is disclosed as comprising an input sensing circuit portion of improved sensitivity to heart beat signals of relatively low amplitude. In particular, the input circuit portion includes a first sensing, bipolar transistor biased by a GaAsP light-emitting diode (LED), and a second amplifying, bipolar transistor whose base is coupled to the collector of the first transistor. Further, the output of the second transistor as taken from its collector is fed back through a suitable shaping circuit to the emitter of the first transistor, whereby controlled high gain and desired frequency/amplitude discrimination characteristics are achieved from the first and second transistors, so that the input sensing portion of the pacemaker circuit is responsive to heart signals above a predetermined level without sacrificing gain.

REFERENCES:
patent: 3661158 (1972-05-01), Berkovits
patent: 3768486 (1973-10-01), Berkovits et al.
patent: 3832703 (1974-08-01), Lenert

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