Bio-osmotic gel for implant prostheses
Patent 5067965 Issued on November 26, 1991. Estimated Expiration Date: 
March 20, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 20, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesHydrophilic, water-swellable, crosslinked, copolymer gel and prosthesis employing same Rupture-resistant prosthesis with creasable shell and method of forming same Multi-lumen high profile mammary implant Viscoelastic material for ophthalmic surgery Radiolucent breast implant Patent #: 4995882 InventorsAssigneeApplicationNo. 496234 filed on 03/20/1990US Classes:623/66.1, MISCELLANEOUS623/8ImplantableExaminersPrimary: Green, Randall L.Assistant: Prebilic, Paul B. Attorney, Agent or FirmInternational ClassesA61F 002/54A61M 036/00 A61N 005/00 AbstractAn improved bio-osmotic gel for filling implant lumens consisting substantially of an amount of a bio-compatible organic polymer and a solution of bio-compatible salt is disclosed which exhibits osmotic qualitites closely paralleling that of human body serum and improved radiolucency with respect to silicone oil and saline. The bio-osmotic gel can contain a polymer having the empirical formula [(CHCH2)2 N(CH2)3 CO]n i.e. polyvinylpyrrollidone. The bio-compatible salt can be made of a low Z value salt such as sodium bicarbonate, sodium acetate, or sodium lactate. The gel material should have an osmolarity between 250 and 350 milliosmoles and have an X-ray absorption under standard exposure approximately equal to that of breast tissue such that processed mammographic X-ray film will have an optical density of 1.2 to 1.3 and an average penetrance of between 9.2 and 30.0 milliroentgens. | |
