Drive circuit for light-emitting diode in pulse oximeter

Details Drive circuit for light-emitting diode in pulse oximeter Drive circuit for light-emitting diode in pulse oximeter

1996-02-22

1997-01-07

Sykes, Angela D.

Surgery

Truss

Pad

128666, 356 41, A61B 500

Patent

active

055906524

ABSTRACT:
Disclosed is a drive circuit for driving a light emitting diode in a pulse oximeter comprising at least two light emitting elements different in wavelength for irradiating a living tissue containing an arterial blood; a light receiving element for receiving light containing one of a reflected light and a transmitted light irradiated from the light emitting elements; a power supply for applying intermittently an inverse bias voltage toward the light emitting elements; and an inductor for applying an inverse electromotive voltage to the light emitting elements, the inductor being connected to the light emitting elements in parallel, wherein a ratio between light absorption change with respect to two wavelengths obtained from optical outputs of the light receiving element so as to obtain a degree of oxygen saturation of arterial blood.

REFERENCES:
patent: 4603700 (1986-08-01), Nichols et al.
patent: 4807630 (1989-02-01), Malinouskas
patent: 5040538 (1991-08-01), Mortazavi
patent: 5193543 (1993-03-01), Yelderman

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