Apparatus for heating tissue with a photoplethysmograph sensor
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United States of America Patent
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Oct 27, 1992
Grant Date -
N/A
app pub date -
Aug 23, 1990
filing date -
Aug 23, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for increasing the blood flow in a patient's tissue by warming the tissue with heat generated by a semiconductor device mounted in a sensor. The amount of heat generated is controlled by varying either the magnitude or the duty cycle of the current that flows through the semiconductor device, with the amount of heat required determined by either the temperature of the sensor's contact surface or the operating performance of the apparatus.
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