POLYURETHANES FOR MEDICAL IMPLANTATION
First Claim
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1. A polyurethane material for use in medical implantation comprising:
- a hard block segment; and
a soft block segment wherein said soft block segment is comprised of at least a dimethyl, diphenyl siloxane diol.
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Abstract
A polyurethane material is provided that reduces or eliminates the need for use of polycarbonates and improves biostability of the polyurethane material while maintaining preferred physical properties. This polyurethane material is comprised of a hard block segment, such as methylene diphenyl diisocyanate (MDI), a phenol-based silicone soft segment and preferably includes a chain extender, such as butanediol. This polyurethane material is particularly useful for medical implantation applications, especially with respect to coatings for lead and assemblies.
13 Citations
21 Claims
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1. A polyurethane material for use in medical implantation comprising:
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a hard block segment; and
a soft block segment wherein said soft block segment is comprised of at least a dimethyl, diphenyl siloxane diol. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of increasing the biostability of biocompatible polyurethane/said method comprising:
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forming a soft segment of said polyurethane using a phenol-based silicone, wherein said soft segment does not include a polycarbonate; and
attaching said soft segment to a hard segment utilizing a chain extender. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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- 14. A polyurethane material comprising a phenol-based silicone soft segment that eliminates use of polycarbonates and improves biostability of said polyurethane material while maintaining the desired physical properties.
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21-32. -32. (canceled)
Specification