Method of hot stamping intraocular lens bodies

Details Method of hot stamping intraocular lens bodies Method of hot stamping intraocular lens bodies

1991-01-22

1992-08-25

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Utilizing plasma, electric, electromagnetic, particulate, or...

264 17, 264 23, 264 24, 264 27, 264 23, B29D 1100

Patent

active

051416778

ABSTRACT:
A method for manufacturing an intraocular lens from a cell cast sheet of high molecular weight polymethylmethracrylate (PMMA). A lens blank having a lens generation area with a surface contoured to correspond to the desired contour of the finished lens is machined from the sheet of PMMA to a predetermined precompensated size larger than desired to acccommodate normalizing shrinkage. The lens blank is normalized by heating the blank in a vacuum oven. The vacuum is released from the oven by introducing dry nitrogen. A stamping die is provided. An optical embossing surface of the stamping die is contoured as a physical negative of the lens generation area and bears a physical negative of the desired optical surface structure of the lens, such as a multifocal diffractive zone plate. The embossing surface of the stamping die is forced into engagement with the surface of the lens blank at a predetermined stamping pressure and for a predetermined stamping dwell time. Sufficient heat or ultrasonic energy is applied to the lens generation area of the lens blank to heat the lens generation area to a temperature between the glass transition temperature and the melt temperature of the polymer, and emboss the surface structure onto the lens generation area. The embossing surface of the stamping die is removed from the lens blank following the expiration of the stamping dwell time.

REFERENCES:
patent: 2292917 (1942-08-01), Williams
patent: 2302918 (1942-11-01), Smith
patent: 2332674 (1943-10-01), Smith
patent: 2443390 (1948-06-01), Kingston
patent: 4153457 (1979-05-01), Kellie
patent: 4210391 (1980-07-01), Cohen
patent: 4242761 (1981-01-01), Chase et al.
patent: 4315337 (1982-02-01), Choyce
patent: 4338005 (1982-07-01), Cohen
patent: 4340283 (1982-07-01), Cohen
patent: 4384097 (1983-05-01), Wingler et al.
patent: 4533397 (1985-08-01), Wingler
patent: 4575372 (1986-03-01), Gundersen
patent: 4636211 (1987-01-01), Nielsen et al.
patent: 4668446 (1987-05-01), Kaplan et al.
patent: 4704016 (1987-11-01), de Carle
patent: 4737322 (1988-04-01), Bruns et al.
patent: 4753653 (1988-06-01), Bissonette et al.
patent: 4769033 (1888-09-01), Nordan
patent: 4793953 (1988-12-01), Maus
patent: 4813955 (1989-03-01), Archatz et al.
patent: 4869588 (1989-09-01), Frieder et al.
patent: 4917681 (1990-04-01), Nordan
patent: 4936849 (1990-06-01), Knoll et al.
patent: 4950057 (1990-08-01), Shirayanagi
patent: 4952048 (1990-08-01), Frieder et al.
`Perspex`--Cast Acrylic Sheet Properties and Fabrication Techniques--Imperial Chemical Industries `Perspex` Technical Service Note PX 127, pp. 1-21.
Ultra Violet Absorbing Grades of `Perspex` Acrylic Sheet--Imperial Chemical Industries `Perspex` Technical Data Sheet PX TD 219, pp. 1-3.
`Perspex` CQ Cast Acrylic Sheet for Clinical Applications--Imperial Chemical Industries `Perspex` Technical Data Sheet PX tD 232, pp. 1-2.
Current Concepts of Multifocal Intraocular Lenses, Edited by Maxwell et al.; Title page cover, pp. 1-3, and pp. 8-11, 1991.
Refractive Surgery--Journal of Cataract Refractive Surgery, pp. 415-427, Jul. 1990.

Affiliated with

Also associated with

Rating

Method of hot stamping intraocular lens bodies does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of hot stamping intraocular lens bodies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of hot stamping intraocular lens bodies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-383028