Biomedical adhesive compositions
First Claim
1. A composition consisting of a network to be obtained by the reaction of a polyisocyanate having at least two isocyanate groups, in an amount which ranges between 20% to 80% by weight of the total amount of reactants with at least one polyol which possesses surface wetting properties in an amount of between 10% to 80% by weight of the total amount of reagents, with the participation of compounds containing calcium and phosphorus, said polyisocyanate being selected from the group consisting of aliphatic, alicyclic and aromatic polyisocyanates, said polyol being selected from the group consisting of polyalkylene ether and glycols containing between 25 and 55 carbon atoms, said compounds containing calcium and phosphorus being present in an amount sufficient to permit said adhesive composition to produce bonding of calcified tissues with a joint strength of at least 0.2 N/sq. mm., said composition being a non-elastomeric biomedical adhesive composition which is degradable by physiological enzymes and which is biocompatible.
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Abstract
Novel non-elastomeric biomedical adhesive compositions for calcified tissues, are described. The compositions are characterized by a network structure which is obtained by the reaction of a polyisocyanate having at least two isocyanate groups with at least one polyol which possesses surface wetting properties with the participation of compounds selected from calcium and phosphorus, optional in the presence of a catalyst. The polyisocyanate is selected from aliphatic, alicyclic and aromatic compounds and preferred amounts are in the range of 20% to 80% by weight of the total amount of reactants. The polyol is selected from polyalkylene ether glycols and polyester glycols containing between 25 to 75 carbon atoms and preferred amounts are in the range of 10% to 80% by weight of the total amount of reactants. The adhesive compositions were found to produce a fast bonding of the calcified tissues, with a joint strength of above 0.5 N/sq.mm.
52 Citations
10 Claims
- 1. A composition consisting of a network to be obtained by the reaction of a polyisocyanate having at least two isocyanate groups, in an amount which ranges between 20% to 80% by weight of the total amount of reactants with at least one polyol which possesses surface wetting properties in an amount of between 10% to 80% by weight of the total amount of reagents, with the participation of compounds containing calcium and phosphorus, said polyisocyanate being selected from the group consisting of aliphatic, alicyclic and aromatic polyisocyanates, said polyol being selected from the group consisting of polyalkylene ether and glycols containing between 25 and 55 carbon atoms, said compounds containing calcium and phosphorus being present in an amount sufficient to permit said adhesive composition to produce bonding of calcified tissues with a joint strength of at least 0.2 N/sq. mm., said composition being a non-elastomeric biomedical adhesive composition which is degradable by physiological enzymes and which is biocompatible.
Specification