Hydrogel patch

G - Physics – 01 – N

Patent

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Details

G01N 27/327 (2006.01) A61K 9/00 (2006.01) A61K 9/70 (2006.01) A61N 1/04 (2006.01) C12M 1/40 (2006.01) C12Q 1/00 (2006.01) C12Q 1/25 (2006.01) C12Q 1/54 (2006.01)

Patent

CA 2226176

A hydrogel patch is disclosed which is comprised of a polymeric material which forms a gel with water with the material being present in an amount of about 0.5 % to 40 % by weight based on the weight of the patch. Electrical conductivity of the water is increased by the addition of an electrolyte. The patch comprises an enzyme which is capable of catalyzing a reaction with a biomedically important molecule such as glucose. Glucose drawn into the patch undergoes a reaction with the aid of the enzyme and the hydrogen peroxide released flows through the electrically conductivity of the water and may react at an electrode surface to generate a signal related to the amount of glucose entering the patch. The patch is also preferably comprised of a buffer which maintains the pH of the patch in the range of from about 3 to 9, and may be further comprised of a cross-linking agent, a biocide, a humectant, and a surfactant. The patch is preferably in the form of a thin (5 µm - 50 mils), flat circular disc (0.5 to 10 cm2 of area) which will conform to the contours of human skin and may have a non-woven fabric embedded therein and removable release liners on each surface.

L'invention concerne une pastille d'hydrogel contenant une matière polymère qui forme un gel avec de l'eau, la matière représentant entre environ 0,5 % et 40 % en poids de la pastille. La conductivité électrique de l'eau est augmentée par l'addition d'un électrolyte. La pastille contient une enzyme qui est capable de catalyser une réaction avec une molécule importante sur le plan biomédical, comme le glucose. Le glucose attiré dans la pastille adhésive subit une réaction enzymatique et le peroxyde d'hydrogène libéré se diffuse dans l'eau conductrice d'électricité et peut réagir avec la surface d'une électrode pour produire un signal rapporté à la quantité de glucose entrant dans la pastille. La pastille contient également un tampon qui maintient le pH de la pastille dans la plage entre 3 et environ 9 et elle peut comprendre en outre un agent de réticulation, un biocide, un humectant, et un tensioactif. La pastille se présente de préférence sous la forme d'un disque mince (5 µm - 50 millièmes de pouce) et plat (0,5 à 10 cm?2¿ de surface) qui s'adapte au contour de la peau humaine. La pastille peut présenter un tissu non tissé et des revêtements de décollement sur les deux faces.

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