Pulse rate monitor

Details Pulse rate monitor Pulse rate monitor

1980-02-21

1982-10-12

Michell, Robert W.

Surgery

Truss

Pad

128666, A61B 502

Patent

active

043531520

ABSTRACT:
A pulse rate monitor for use while exercising. A clothespin type finger clip remote from the counting and display unit grips the user's finger in a predictable, mechanically stable manner. A light emitting diode, strobed to reduce battery drain, transmits infrared radiation through the finger, and electronic circuitry monitors the modulation of radiation caused by changes in capillaries with each heart beat. The circuitry includes an active load for the phototransistor, which, by means of bandpass filtered feedback, enhances heart beat signal and reduces sensitivity to ambient light, noise, and variations in phototransistor characteristics.

REFERENCES:
patent: 3908636 (1975-09-01), Page
patent: 3980075 (1976-09-01), Heule
patent: 4063551 (1977-12-01), Sweeney
patent: 4116228 (1978-09-01), Hudspeth et al.
patent: 4166454 (1979-09-01), Meijer
patent: 4181134 (1980-01-01), Mason et al.
patent: 4201222 (1980-05-01), Haase
patent: 4230127 (1980-10-01), Larson
patent: 4258719 (1981-03-01), Lewyn

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