Tunable ECG sensing filter for pacemaker

Details Tunable ECG sensing filter for pacemaker Tunable ECG sensing filter for pacemaker

1981-03-02

1983-05-03

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

043817866

ABSTRACT:
A tunable electrocardiogram sensing filter for a pacemaker includes a tapped analog delay (40) having a plurality of tap load resistors (44) selected according to a tap weight function to give a bandpass characteristic. The electrical ECG from the heart pacemaker lead (11) is applied to an input (41) of the tapped analog delay, and is successively sampled and transferred from stage to stage through the delay under control of a clock (34). The filtered output (33) is obtained by summing the tap load resistors, and may be applied for resetting pacemaker timing and output circuits in a demand type pacemaker. In an implantable implementation of the invention, the clock is programmable to different frequencies, which allows scaling the bandpass characteristic of the filter upwards or downwards in frequency to accommodate different frequency component characteristics of the ECG's of individual patients.

REFERENCES:
patent: 3949758 (1976-04-01), Jirak
patent: 4192316 (1980-03-01), Walters et al.
patent: 4202342 (1980-05-01), Keller, Jr.
patent: 4318411 (1982-03-01), Elmovist
Weckler, Gene P., Reticon Corporation Technical Note No. 100, "A Tapped Analog Delay for Sampled Data Signal Processing".

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