Methods and apparatus for sensing intracardiac signals for an in

Details Methods and apparatus for sensing intracardiac signals for an in Methods and apparatus for sensing intracardiac signals for an in

1993-12-23

1995-02-14

Manuel, George

Surgery

Truss

Pad

128903, A61B 50452

Patent

active

053885864

ABSTRACT:
A circuit for use in an implantable cardiac pacemaker for use in processing intracardiac signals and methods of processing such signals. The circuit includes a passive filter 1 has a bandwidth of 0.1 to 80 Hz approximately. An amplifier 2 with switched capacitors presents at the output a dynamics of 0.8V approximately and a gain lower than 50. An analog-to-digital converter 3 with delta modulation, which is controllably variable in step and functions at two frequencies, one of 1 kHz approximately, the other of 4 kHz approximately. The circuit may be used for both processing said signals to identify spontaneous cardiac events and to telemeter an intracardiac ECG.

REFERENCES:
patent: 4596252 (1986-06-01), Nelson
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patent: 4708144 (1987-11-01), Hamilton et al.
patent: 4974589 (1990-12-01), Sholder
patent: 5024221 (1991-06-01), Morgan
patent: 5055843 (1991-10-01), Ferguson, Jr. et al.
patent: 5273049 (1993-12-01), Steinhaus et al.

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