Methods for forming hollow, porous-surfaced elastomeric bodies

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B29C 67/20 (2006.01) A61F 2/06 (2006.01) A61J 1/00 (2006.01) A61L 27/00 (2006.01) C08J 9/26 (2006.01) A61F 2/12 (2006.01)

Patent

CA 1323149

METHODS FOR FORMING HOLLOW, POROUS-SURFACED ELASTOMERIC BODIES Abstract A method of forming hollow, porous elastomeric bodies and hollow, dual-layered elastomeric bodies wherein one layer is porous and contiguous with the other layer which is solid by a) coating a surface of a mandrel with a coating liquid, b) adhering a layer of water-elutable particles onto the coated mandrel surface, c) applying a layer of fluid elastomeric composition to the particle-coated mandrel surface wherein the elastomeric composition is capable of forming a water-insoluble elastomer, d) causing said elastomeric composition to form a cohesive mass while in contact with the particle-coated mandrel surface, e) dissolving said elutable particles from the cohesive mass with a water-based solvent, and f) removing the cohesive mass from the mandrel. The coating liquid comprises water and may also further comprise a wetting agent and/or a sugar. The invention also relates to the method wherein the water- elutable particles are adhered to the mandrel surface by heating the mandrel surface. The method is useful or making prostheses, e.g., mammary prostheses ant vascular prostheses.

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