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Last Updated: December 17, 2025

Claims for Patent: 4,957,119

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Summary for Patent: 4,957,119

Title:	Contraceptive implant
Abstract:	The invention relates to an implant of polymeric material which can release a contraceptive agent for a relatively long time when fitted subcutaneously or locally. The implant comprises a core material of ethylene/vinyl acetate copolymer which functions as a matrix for a contraceptive substance, an ethylene/vinyl acetate membrane encasing the core material, and a contact layer at the interface of the core material and membrane which prevents the separation of the core material from the membrane. The implant of the invention is made by a co-extrusion process.
Inventor(s):	Hendrik de Nijs
Assignee:	Organon USA LLC
Application Number:	US07/229,066
Patent Claims:

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