PREPARATION OF NOVEL BIOMEDICAL POLYMERS HAUING BIOMEMBRANE-LIKE SURFACE AND RECOGNITION OF THEIR NON THROMBOGENIC

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Novel polymer biomaterials, which can use in contact with blood, are prepared with strong inspiration from the surface structure of biomembrane. That is, the polymers with phospholipid polar group in the side chain, 2-methacrylooyloxyethyl phosphorylcholine (MPC) polymers were synthesized. The MPC polymers can inhibit surface-induced clot formation effectively, even when they contact with blood in the absence of anticoagulant. This phenomenon was due to reduction of plasma protein and suppression of denaturation of adsorbed proteins. That is, the MPC polymers interact with blood components very mildly.The amount of protein adsorbed on the polymer surface had a close relation to the free water fraction in the hydrated polymer. A comparison of the conformational change in proteins adsorbed on the MPC polymers and poly (HEMA) revealed that the effectiveness of the phosphorylcholine group in preventing the change, and the protein on the MPC polymer maintained its original state. Thus, it is concluded that the free water fraction is one of the most important factors in controlling the protein adsorption process.As the molecular structure of the MPC polymer was easily designed by changing monomer units and composition, it could apply to surface modification of artificial organs and biomedical devices for improving blood compatibility and tissue compatibility. Thus, the MPC polymers are useful polymer biomaterials for making high performance artificial organs and biomedical devices to provide safety medical treatments.