Infrared and near-infrared testing of blood constituents

Details Infrared and near-infrared testing of blood constituents Infrared and near-infrared testing of blood constituents

A - Human Necessities

61

B

A61B 5/00 (2006.01)

Patent

CA 2080472

2080472 9115990 PCTABS00007 An apparatus and method are disclosed for determining a level of a constituent such as glucose in a body fluid such as blood. The apparatus and method utilize a light generator (22) for generating a testing light of known intensity with the testing light including a wavelength absorbable by the constituent being measured. The light generator (22) also generates a reference light of known intensity having a wavelength not absorbable by the constituent being measured. The testing light and reference light are directed towards a fluid containing an unknown concentration of a constituent. A light detector (30) is provided for measuring the intensity of the testing light and reference light being spectrally modified by the fluid. A light path distance measurer (28) is provided for measuring a distance of a light path travelled by the testing light and reference light. A circuit (32) is provided for calculating a level of the constituent in the fluid in response to a reduction in intensity of the testing light and reference light and in response to the measured distance.

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