Cardiotachometer

Details Cardiotachometer Cardiotachometer

1976-03-15

1977-07-12

Kamm, William E.

Surgery

Truss

Perineal

324 78D, A61B 504

Patent

active

040347451

ABSTRACT:
The heart beat pulses of an ECG signal are counted by a digital counter. A timing signal loads the count into a register once each 15 seconds and resets the counter to zero. Four intermediate registers hold four successive counts. The output of the four registers is summed and applied through a multiplexer to an eight bit main register. When the equipment is first turned on, the multiplexer is forced into a special state in which it loads the output of the counter into the upper six bits of the eight bit main register thereby providing a main register output that is four times the value in the counter. The main register output is displayed providing a digital heart beat reading in pulses per minute. Once each 15 seconds during the first minute of operation, this main register is updated from the counter to provide a new output reading. At the end of the first minute, the state of the multiplexer is switched and from there on in, the sum output of the four intermediate registers is applied to the main register to provide a heart beat rate based on a full one minute count. This count is also updated once each 15 seconds because the four intermediate registers are in tandem.

REFERENCES:
patent: 3384075 (1968-05-01), Mitchell
patent: 3599628 (1971-08-01), Abbenante et al.
patent: 3717140 (1973-02-01), Greenwood
patent: 3829785 (1974-08-01), Schroder et al.
patent: 3837333 (1974-09-01), Bruckheim
patent: 3858574 (1975-01-01), Page
patent: 3909714 (1975-09-01), Nakano
patent: 3921624 (1975-11-01), Vogelman
patent: 3928798 (1975-12-01), Valis

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