Circuit for measuring the refractory period of a heart pacer

Details Circuit for measuring the refractory period of a heart pacer Circuit for measuring the refractory period of a heart pacer

1976-03-15

1977-05-03

Rolinec, Rudolph V.

Electricity: measuring and testing

Electrical speed measuring

Including 'event' sensing means

128 206F, 128 205T, G04F 800

Patent

active

040217361

ABSTRACT:
A circuit for measuring the refractory period of a heart pacer includes first, second and third monostable multivibrators. The first monostable multivibrator is reset by the reception of a pacer stimulation pulse to produce a state change for a time period longer than the stimulation pulse interval of the pacer. The second monostable multivibrator is triggered by the trailing edge of the stimulation pulse, and has a variable time constant to produce a state change for a controlled period of time. The third monostable multivibrator applies a pulse to the pacer at the conclusion of the state change of the second monostable multivibrator. A counter is provided which counts the stimulation pulses produced by the pacer, and is connected to a resistive time constant circuit, to add additional time controlling resistors into the time constant circuit of the second monostable multivibrator. A latch circuit discontinues the advancement of the counter after the first monostable multivibrator state change is reached, and a pulse width monitor indicates the time width of the state change of the second monostable multivibrator to thereby indicate the refractory period of the pacer.

REFERENCES:
patent: 3773038 (1973-11-01), Smith
patent: 3857398 (1974-12-01), Rubin
patent: 3858574 (1975-01-01), Page

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