Drive circuit for light-emitting diode in pulse oximeter
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United States of America Patent
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Jan 7, 1997
Issued Date -
N/A
app pub date -
Feb 22, 1996
filing date -
Jun 15, 1992
priority date (Note) -
In Force
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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.
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