Monitoring led wavelength shift in photoplethysmography
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United States of America Patent
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Issued Date -
Apr 17, 2003
app pub date -
Oct 11, 2001
filing date -
Oct 11, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention is directed to a method and system for the determination of a spectral characteristic of light signals emitted by light signal emitters of a photoplethysmographic probe to achieve improved accuracy in photoplethysmographic blood analyte level determinations. In one embodiment, a system for use in photoplethysmography includes a plurality of light signal emitters (20A-D) within a photoplethysmographic probe (12) and a voltage sensor (60) and data processor (70) within a photoplethysmographic monitor unit (14) to which the probe (12) is connectable. The voltage sensor (60) is operable to sense a voltage drop across each light signal emitter (20A-D) as each emits a corresponding light signal (22A-D) for transmission through a tissue under test. The data processor (70) is operable to establish at least one spectral characteristic, such as the center wavelength, of each emitted light signal (22A-D) based on the sensed voltage drops.
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