Methods and apparatus for in situ formation of hydrogels

A - Human Necessities – 61 – B

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A61B 17/00 (2006.01) A61M 37/00 (2006.01)

Patent

CA 2340381

Methods, and apparatus of forming in situ tissue adherent barriers are provided using a sprayer (90) capable of applying two or more viscous cross linking solutions to tissue. The sprayer (90) comprises separate spray nozzles (98, 100) for each of two or more cross linking solutions, wherein each nozzle (98, 100) is in communication with a gas pressurized chamber (48) also may include valves (52) that prevent back flow through the supply lines (99, 101) carrying the cross linking solutions, and a venting system (106, 108) for venting excess pressure for laparoscopic applications. In the presence of gas flow, the cross linking solutions are atomized, and mixed to form a spray. Multi-component hydrogel systems suitable for use with the inventive methods, and apparatus are also described.

L'invention concerne des procédés et un appareil servant à former in situ des barrières adhérant à un tissu au moyen d'un pulvérisateur (90) capable d'appliquer à un tissu deux ou davantage de solutions de réticulation visqueuses. Le pulvérisateur (90) comporte des buses (98, 100) de pulvérisation séparées pour chacune des solutions de réticulation. Chaque buse (98, 100) est en communication avec une chambre (48) de gaz sous pression, et peut également comporter des soupapes (52) empêchant un flux de retour par les trajets (99, 101) d'alimentation contenant les solutions de réticulation, et un système (106, 108) de purge servant à éliminer une pression excédentaire pour des applications de laparoscopie. En présence d'un flux de gaz, les solutions de réticulation sont atomisées, et mélangées pour former une solution pulvérisée. L'invention concerne également des systèmes d'hydrogel à composants multiples pouvant être utilisés avec les procédés de l'invention, et un appareil.

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