Therapeutic use of polymers

A - Human Necessities – 61 – K

Patent

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Details

A61K 47/30 (2006.01) A61B 17/00 (2006.01) A61K 49/04 (2006.01) A61L 27/14 (2006.01)

Patent

CA 2346863

An insoluble polymer is deposited in a body cavity for instance to embolise a vein or pack an aneurysm, the polymer having pendant zwitterionic groups to improve biocompatibility. The insoluble polymer is preferably formed by an in situ gelling step in which a charged, preferably soluble, polymer having pendant zwitterionic groups is introduced in the form of a composition in which it is soluble and is gelled by being mixed with a counterionically charged soluble polymer (polyelectrolyte), to form a polyion complex. Preferably the or each soluble polymer is formed by polymerising ethylenically unsatured monomers including a zwitterionic monomer, for instance 2-methacryloyloxyethyl-2'-trimethylammoniumethyl phosphate inner salt, an ionic monomer such as trimethylammonium alkyl(alk)acrylate or a sulphoalkyl(alk)acrylate and optionally a diluent monomer such as an alkyl(alk)acrylate.

La présente invention concerne un polymère insoluble placé dans une cavité corporelle en vue de l'embolisation d'une veine ou d'un sac anévrismal, ce polymère comportant des groupes zwittérioniques libres permettant d'améliorer la biocompatibilité. De préférence, on forme le polymère insoluble par une étape de gélification in situ dans laquelle un polymère chargé, de préférence soluble, présentant des groupes zwittérioniques libres est introduit sous la forme d'une composition dans laquelle il est soluble, puis on le gélifie en le mélangeant avec un polymère soluble chargé par contre-ion (polyélectrolyte), de manière à former un complexe polyionique. De préférence, on obtient le polymère soluble (ou chaque polymère soluble) en polymérisant des monomères insaturés en éthylène, notamment un monomère zwittérionique, par exemple 2-méthacryloyloxyéthyl-2'triméthylammoniuméthyl phosphate sel interne, un monomère ionique tel que triméthylammonium alkyl(alk)acrylate ou un sulphoalkyl(alk)acrylate, et éventuellement un monomère diluant tel qu'un alkyl(alk)acrylate.

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