Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Reshaping or treatment of an optical preform
Patent
1992-08-03
1994-06-21
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Reshaping or treatment of an optical preform
83 50, 83 55, 264 17, 264153, B29D 1100, B26F 138
Patent
active
053226496
ABSTRACT:
The present invention relates to a process for fabricating biocompatible implants. In particular, the present invention process involves punching out implants from sheet stock. In the exemplary embodiment, the implant is an intraocular lens, wherein the lens haptic is punched from ribbon stock fed through a punch press. The punching operation can be accomplished in a planar punch and die arrangement, or the die can be situated on cooperatively rotating drums. In an alternative embodiment, the entire intraocular lens is punched from sheet stock. In this process, the lens optics are formed first in the sheet stock to provide individual convex or concave hemispheres, spaced along the length and width of the sheet. The sheet stock is aligned with a die, and the die punches out the lens such that the lens optic coincides with the hemispheres and the lens haptics are punched therealong simultaneously.
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Rheinish Robert S.
Richards Thomas P.
Tonks Allan R.
Kabi Pharmacia Ophthalmics Inc.
Lowe James
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