Method and apparatus for monitoring blood analytes noninvasively

Details Method and apparatus for monitoring blood analytes noninvasively Method and apparatus for monitoring blood analytes noninvasively

1990-04-19

1992-08-11

Howell, Kyle L.

Surgery

Truss

Pad

128664, A61B 500

Patent

active

051370239

ABSTRACT:
A non-invasive system for measuring the concentration of an analyte, such as glucose, in an absorbing matrix is described. The system directs beams of light at the matrix using an analyte sensitive wavelength and an analyte insensitive wavelength. The principles of photoplethysmography are applied to measure the change in light intensity caused by matrix absorption before and after the blood volume change caused by the systolic phase of the cardiac cycle. The change in light intensity is converted to an electrical signal which is used to adjust the light intensity and as a measure of analyte concentration.

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