Physiological event recognition techniques for use with a delta

Details Physiological event recognition techniques for use with a delta Physiological event recognition techniques for use with a delta

1982-06-30

1985-04-09

Kamm, William E.

Surgery

Truss

Pad

A61B 504

Patent

active

045095299

ABSTRACT:
The signal sensed on a heart pacer electrode is converted by a delta modulator to a sequence of samples of 0 and 1 bit values. The resulting bit sequence is delayed, and the original bit sequence and its delayed version are continuously subtracted from each other in a clocked up/down counter to derive a count. When the count reaches a threshold value, three different recognition logic circuits are triggered and they then operate for two milliseconds. One circuit recognizes a beat if the count does not drop below another, lower threshold value during the timing interval. A second circuit detects a beat if the count remains above the threshold level for at least 50% of the time during the timing interval. The third circuit detects a beat by operating directly on the delta modulator output bit sequence; it checks whether bits of the value indicative of the triggering event predominate over bits of the opposite value during the timing interval.

REFERENCES:
patent: 3868567 (1975-02-01), Ekstrom
patent: 3952731 (1976-04-01), Worstencroft
patent: 4388927 (1983-06-01), Schober

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