Shaped bodies for use as implants in human medicine and...

A - Human Necessities – 61 – L

Patent

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Details

A61L 27/00 (2006.01) A61L 31/06 (2006.01) A61L 31/14 (2006.01) C08G 18/10 (2006.01) C08G 18/42 (2006.01)

Patent

CA 2308190

The present invention relates to shaped bodies for use as implants in human and veterinary medicine as pins, screws, discs, ligament fixtures and the like. The shaped bodies consist of polyurethanes having ester links which can be hydrolysed in a human body and which give hydrolysis fragments which are sufficiently small to be resorbed in the human body. The shaped bodies are characterised in that the polymer is a network polymer which substantially lacks urea groups. The invention also relates to a method for the production of the shaped bodies which means that a suitable starting mixture according to the invention is introduced in moulds and cured at a temperature of 70-150 ~C in the absence of catalysts and at a temperature of 30-100 ~C in the presence of a catalyst.

La présente invention concerne des corps formés convenant, en médecine humaine et en médecine vétérinaire, comme implants tels que notamment des broches, des vis, des disques, des ancrages ligamentaires. Ces corps formés sont faits de polyuréthanes portant des liaisons esters qui peuvent s'hydrolyser dans le corps, et qui donnent des fragments d'hydrolyse suffisamment petits pour se résorber dans le corps humain. Ces corps formés sont caractérisés en ce que le polymère est un polymère réticulé auquel manquent sensiblement des groupes urée. L'invention concerne également un procédé de production de corps formés consistant à prendre un mélange de début approprié selon l'invention, à l'introduire dans des moules, et à le laisser durcir, à une température de 70 ·C à 150 ·C en l'absence de catalyseurs, et à une température de 30 ·C à 100 ·C en présence d'un catalyseur.

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