Restorative composition for hard tissue and dispensing...

A - Human Necessities – 61 – L

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Details

A61L 24/00 (2006.01) A61B 17/56 (2006.01) A61K 6/08 (2006.01) A61L 27/00 (2006.01)

Patent

CA 2178810

A restorative composition for hard tissue, comprising a paste (A) containing an inorganic calcium phosphate powder, a polymerizable monomer mixture and a polymerization initiator, and a paste (B) containing an inorganic calcium phosphate powder, a polymerizable monomer mixture and a polymerization accelerator, wherein the content of the inorganic calcium phosphate powder in each paste is 75-85% by weight, and each monomer mixture contains a monomer of the formula (1): (see formula 1) and a monomer of the formula (2): (see formula 2) the content of the monomer (1) accounting for 40-65% by weight of the monomer mixture as a whole. The composition can well adhere to the bone and has a sufficient water resistance. As it generates little heat upon hardening, it is less detrimental to the patient's tissues. Furthermore, the paste has an appropriate consistency, which facilitates homogeneous mixing of the paste and application of the resultant mixture to the affected part by the use of a dispensing apparatus. Thus, the restorative composition can be used not only as a bone cement but also as a filler for the defected part of the bone, a bone prosthesis or an artificial bone.

Composition de réparation des tissus durs consistant en une pâte (A) comportant une poudre inorganique de phosphate de calcium, un mélange de monomères polymérisables et un initiateur de polymérisation, et une pâte (B) comportant une poudre inorganique de phosphate de calcium, un mélange de monomères polymérisables et un initiateur de polymérisation. La teneur de chacune des pâtes en poudre inorganique représente de 75 à 85 % en poids et chacun des mélanges de monomères contient des monomères de formule générale (I) et (II), la teneur en monomère (I) représentant de 40 à 65 % en poids de la totalité du mélange. Ladite composition adhère bien aux os et présente une bonne résistance à l'eau. Comme elle dégage moins de chaleur lors de sa prise, elle est peu nuisible pour les tissus du patient, et comme la consistance de la pâte est adéquate, l'unité de distribution de l'invention permet d'assurer un mélange homogène des pâtes et l'application du mélange sur les parties lésées. La composition peut non seulement servir de ciment osseux, mais également de recharge pour les parties manquantes de l'os, de prothèse osseuse, ou d'os artificiel.

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