Patent ID: 7348020

Claim:
A biodegradable invasive medical device for guided tissue regeneration, which device comprises: a biodegradable polymer that is comprised of at least one material selected from the group consisting of a water-insoluble thermoplastic and a thermosetting polymer admixed to a solvent that is miscible with at least one liquid selected from the group consisting of any aqueous solution, aqueous alcoholic solution, alcohol-group-containing solution and synthetic or natural physiological liquids, the at least one material selected from the group consisting of a water-insoluble thermoplastic and thermosetting polymer and the liquid-miscible solvent for the polymer are mixed in such a proportion that contains 15-40 wt-% of the polymer and 50-70 wt-% of the solvent so as to form a mixture selected from the group consisting of an organogel, a plastigel, a xerogel, and a solid-containing pasty material, wherein the mixture contains the at least one material selected from the group consisting of a water-insoluble thermoplastic and thermosetting polymer in a percentage that is higher than that corresponding to a saturation level, and wherein the device further contains 0.1-70 wt-% of the at least one liquid selected from the group consisting of any aqueous solution, aqueous alcoholic solution, alcohol-group-containing solution and synthetic or natural physiological liquids, wherein biocompatible additives which increase the viscosity, increase mechanical performance and/or improve tissue regeneration and bone regeneration are added to the mixture that is in a form selected from the group consisting of an organogel, plastigel, xerogel and slurry and is formed between the at least one material selected from the group consisting of a thermoplastic and thermosetting biodegradable polymer and the solvent, and said additives include at least one material selected from the group consisting of powders, granules, and small pieces of material with a spongy consistency and consisting of at least one of the thermoplastic and thermosetting polymer, and the following components are mixed together: 0.5-97 wt-% of at least one material selected from the group consisting of a powder, granules, and small pieces of a material with a spongy consistency and consisting of at least one of the thermoplastic and thermosetting polymer, and dextran.