Cardiac pacer having active notch filter system

Details Cardiac pacer having active notch filter system Cardiac pacer having active notch filter system

1982-09-28

1984-03-13

Kamm, William E.

Surgery

Truss

Pad

128901, A61N 136

Patent

active

044360932

ABSTRACT:
A battery powered external pacer operable in fixed-rate and demand modes includes a sense amplifier having an active notch filter system for attenuating power line interference. The filter system comprises four separate data channels each including a transmission gate synchronously driven by pacer clock pulses for frequency stability. Charges developed on capacitors in each data channel are summed by an output capacitor to avoid the need for amplifiers in each channel. A detector having two comparators for detecting positive and negative directed R-wave components derives heart pulses from the amplified signal. A pulse-driven reference supply having very low power consumption provides operating bias required by the detector. A battery monitor having a single comparator simultaneously monitors supply voltage for low and unusable voltage levels.

REFERENCES:
patent: 3848586 (1974-11-01), Suzuki et al.
patent: 3927677 (1975-12-01), Gobeli et al.
patent: 4023564 (1977-05-01), Valiquette et al.
patent: 4114627 (1978-09-01), Lewyn et al.
patent: 4244376 (1981-06-01), Fisher et al.

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