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Abstract
Four aortic and two mitral Björk-Shiley tilting disc -valves were studied after 0.5 to 2.75 years of in-vivo implantation. All Delrin discs exhibited excellent bio-compatibility and life expectancies well in excess of 50 years. Based on this study, it is concluded that Delrin is an acceptable material for a heart valve occluder if appropriate processing and compensation is made to allow for its propensity to absorb moisture. No discolouration, degradation or variance was experienced.