Method and apparatus for performing multiwavelength...

G - Physics – 01 – N

Patent

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G01N 33/49 (2006.01) A61B 5/00 (2006.01)

Patent

CA 2211918

A photoplethysmographic measurement device that utilizes wavelength division multiplexing is provided. Signals from multiple light emitters are combined into a single multiplexed light signal in a test unit before being delivered to a physically separated probe head attached to a test subject. The probe then causes the single multiplexed signal to be transmitted through a tissue under test on the test subject, after which it is processed to determine a blood analyte level of the test subject. By combining the light signals into a single multiplexed signal before delivering the signals to the probe, a single light guide, such as a single optical fiber, can be used to deliver the signals to the probe, thereby reducing system implementation cost and increasing the flexibility of the probe cable. In addition, the invention allows the signals from the light emitters to be directed into the test subject from a single point source, which can significantly increase measurement accuracy.

Dispositif de mesure photopléthysmographique utilisant le multiplexage en longueur d'onde. Des signaux de multiples émetteurs de lumière sont combinés en un unique signal lumineux multiplexé dans une unité d'essai avant d'être transmis à une tête de sonde physiquement séparée qui est fixée à un sujet d'essai. Puis la sonde provoque la transmission du signal lumineux multiplexé à travers un tissu étudié du sujet d'essai, après quoi le signal est traité afin de déterminer le niveau de l'échantillon du sang à analyser du sujet. En combinant les signaux lumineux en un unique signal multiplexé avant transmission à la sonde, un unique guide de lumière, par exemple une seule fibre optique, peut servir à acheminer les signaux vers la sonde, ce qui réduit le coût de mise en oeuvre du système et accroît la souplesse du câble de la sonde. En outre, l'invention permet aux signaux des émetteurs de lumière d'être dirigés à l'intérieur du sujet d'essai à partir d'une source ponctuelle simple, ce qui peut accroître sensiblement l'exactitude des mesures.

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