Removal of stratum corneum by means of light

A - Human Necessities – 61 – B

Patent

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Details

A61B 18/20 (2006.01) A61B 17/00 (2006.01) A61B 18/18 (2006.01)

Patent

CA 2282452

A method for increasing the permeability of the stratum corneum by means of a source of light, preferably a laser, more preferably a pulsed laser. By increasing the permeability of the stratum corneum, access to the interstitial fluid is achieved, thereby enabling measurement of analytes in the interstitial fluid. In one aspect, the method comprises the steps of (a) providing a source of light having a wavelength of from about 930 nm to about 1040 nm; and (b) exposing a region of the stratum corneum of the patient to said source of light for a period of time sufficient to form an opening in the stratum corneum. Preferably, exposure of the region of the stratum corneum to the source of light is ceased when an amount of interstitial fluid fills the opening in the stratum corneum, which amount is sufficient to cause the scatter intensity of the light reflected from the surface of the interstitial fluid occupying the opening in the stratum corneum to differ from the scatter intensity of the light reflected from a region of the stratum corneum that is substantially free of interstitial fluid. The invention also involves an apparatus for carrying out the foregoing method.

L'invention concerne un procédé pour améliorer la perméabilité de la couche cornée au moyen d'une source de lumière, de préférence, au moyen d'un laser, si possible d'un laser pulsé. En augmentant la perméabilité de la couche cornée, on ouvre l'accès au liquide interstitiel, ce qui permet de mesurer les analysats contenus dans le liquide interstitiel. Dans l'un des aspects, le procédé comprend les étapes qui consistent: a) à fournir une source de lumière possédant une longueur d'onde comprise entre environ 930 nm et environ 1040 nm; et b) à exposer une région de la couche cornée du patient à ladite source de lumière pendant une durée suffisante pour la formation d'une ouverture dans la couche cornée. De préférence, on fait cesser l'exposition de la région de la couche cornée à la source de lumière lorsqu'une quantité de liquide interstitiel remplit l'ouverture dans la couche cornée, ladite quantité étant suffisante pour faire en sorte que l'intensité de diffusion de la lumière réfléchie par la surface du liquide interstitiel, qui occupe l'ouverture dans la couche cornée, diffère de l'intensité de diffusion de la lumière réfléchie par une région de la couche cornée sensiblement exempte de liquide interstitiel. L'invention concerne également un appareil permettant la mise en oeuvre du procédé décrit.

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