Non-invasive optical measurement of a blood constituent

Details Non-invasive optical measurement of a blood constituent Non-invasive optical measurement of a blood constituent

A - Human Necessities

61

B

A61B 5/1455 (2006.01)

Patent

CA 2332921

An over-systolic pressure is applied to a patient's blood perfused fleshy medium. The pressure causes a state of temporary blood flow cessation within a time period insufficient for irreversible changes in the fleshy medium. Release of the over systolic pressure causes a state of transitional blood flow terminating with the normal blood flow. At least two sessions of measurement, separated in time, are executed and at least one of these sessions is selected within the time period including the state of temporary blood flow cessation and the state of transitional blood flow. Optical non-invasive measurement of the concentration of at least one blood constituent are successively performed at these at least two sessions, and respective values of the concentration are obtained.

On applique une pression supersystolique à un patient sur un support charnu sous perfusion sanguine. Cette pression provoque un état provisoire d'interruption de la circulation sanguine pendant une période de temps trop courte pour provoquer des modification irréversibles dans le support charnu. Le relâchement provoque un état transitoire de circulation sanguine qui se transforme en une circulation sanguine normale. Au moins deux séances de mesure espacées dans le temps ont lieu. On choisit au moins une de ces séances pendant la période de temps comprenant l'état provisoire d'interruption de la circulation sanguine et l'état transitoire de circulation sanguine. Lors de ces deux séances ou plus, on réalise successivement des mesures optiques non invasives de la concentration d'au moins un constituant sanguin. On obtient ainsi des valeurs respectives de la concentration d'au moins un constituant sanguin.

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