Hybrid optical delivery system for photoplethysmography
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United States of America Patent
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Nov 11, 2003
Grant Date -
Sep 25, 2003
app pub date -
Mar 22, 2002
filing date -
Mar 22, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A hybrid optical system for photoplethysmographic measurements is disclosed. The system delivers light from a plurality of emitters to the tissue-under-test. A set of one or more of the emitters resides in close proximity to the sensor. A second set of one or more emitters resides at some distance from the sensor with the light from this second set of emitters being delivered to the sensor by a light pipe typically consisting of a fiber optic cable. This invention allows the photoplethysmographic instrument designer to use two or more different types of emitters in the same photoplethysmographic device while still generating a technically feasible and cost effective design.
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