Therapeutic rings
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United States of America Patent
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Dec 19, 1989
Grant Date -
N/A
app pub date -
Jul 21, 1988
filing date -
Jul 22, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The specification describes and claims a method of making therapeutic rings from a curable silicone rubber based composition. The rings are capable of controlled release of the therapeutic agent in the human or animal body. The method includes 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.
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