Pulse extraction of ocular medical devices

Details Pulse extraction of ocular medical devices Pulse extraction of ocular medical devices

2006-02-14

2006-02-14

Vargot, Mathieu D. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Nonmechanical aftertreatment

C134S901000, C264S085000, C526S243000, C526S243000

Reexamination Certificate

active

06998073

ABSTRACT:
A method of extracting residual materials from a polymeric, ophthalmic biomedical device, such as a contact lens, by using a mixture comprised of a primary solvent, such as carbon dioxide, and a polar co-solvent, such as isopropanol. By exposing the device to the co-solvent, the device expands. By pulsing or varying the concentration of the polar co-solvent in the mixture, the lens dimensions vary accordingly. When the lens is extracted while retained in a mold, the changes in lens dimensions causes the lens to be released from the mold.

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