Therapeutic rings

Details Therapeutic rings Therapeutic rings

A - Human Necessities

61

J

18/49

A61J 3/00 (2006.01) A61K 9/00 (2006.01) A61M 31/00 (2006.01) A61M 37/00 (2006.01) B29C 47/06 (2006.01) C07J 1/00 (2006.01)

Patent

CA 1298688

Abstract of the Disclosure The specification describes and claims a method of making therapeutic rings from a curable silicone rubber based composi- tion. The rings are capable of controlled release of the thera- peutic agent in the human or animal body. The method comprises the steps of: (i) extruding a first composition comprising a therapeutic agent and a first elastomer-forming silicone composition to provide a core; (ii) extruding a second composition comprising a second elastomer-forming silicone composition to provide a sheath enclosing the core; (iii) bringing together end portions of a piece of extruded core and sheath to form a ring, (iv) effecting crosslinking of the extruded core, and (v) effecting crosslinking of the extruded sheath.

572616

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