Bio-osmotic gel for implant prostheses

Details Bio-osmotic gel for implant prostheses Bio-osmotic gel for implant prostheses

1990-03-20

1991-11-26

Green, Randall L.

Prosthesis (i.e., artificial body members), parts thereof, or ai

Miscellaneous

623 8, 623 11, A61F 254, A61M 3600, A61N 500

Patent

active

050679651

ABSTRACT:
An 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 [(CHCH.sub.2).sub.2 N(CH.sub.2).sub.3 CO].sub.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.

REFERENCES:
patent: 4138382 (1979-02-01), Polmanteer
patent: 4731081 (1988-03-01), Tiffany et al.
patent: 4773909 (1988-09-01), Chaglassian
patent: 4965253 (1990-10-01), Goldberg et al.
patent: 4995882 (1991-02-01), Destouet et al.

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