04387717 is referenced by 54 patents and cites 8 patents.

A system for internally sensing the cardiac electrogram in a patient with a cardiac pacemaker is disclosed comprising an implanted electrode that, in combination with the metallic case of the pacemaker which acts as an indifferent electrode, senses cardiac electrical signals and provides them as an input to the pacer electronics. The sensing electrode is appropriately spaced from the pacing electrode and positioned so that cross coupling is minimized to permit sensing of the cardiac electrogram without undue interference from the pacing stimulus and after potentials, and so that the pickup of both R- and P-waves is optimized. The sensed signals may be used to control atrial, ventricular or multichamber demand pacemakers and/or may be telemetered out of the patient for pickup and analysis by external equipment. A flat plate and a preferred cylindrical ring form of electrode are described.

Title
Pacer internal cardiac electrogram sensing system
Application Number
6/193746
Publication Number
4387717
Application Date
October 3, 1980
Publication Date
June 14, 1983
Inventor
G Frank O Tyers
Vancouver
CA
Paul H Neff
Bellefonte
PA, US
Howard C Hughes Jr
Cornwall
PA, US
Robert R Brownlee
State College
PA, US
Agent
Cooper Dunham Clark Griffin & Moran
Assignee
Research Corporation
NY, US
IPC
A61N 1/36
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