Cast molding of intraocular lenses
US5620720A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1994 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | Nov 29, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention provides a disposable plastic mold assembly for an intraocular lens or the optic body thereof, which is inexpensive, less labor intensive than prior art intraocular lens molding techniques, and produces an intraocular lens having smooth, polished edges which require little or no post-mold finishing work. Numerous innovative features of the invention include an edge design which assures a seal between the male and female molds to thereby minimize flash during the cast molding operation, and the provision of a way to pre-align the male and female molds during assembly, consisting of an interference fitting relationship between the male and female molds. An additional feature is a way to maintain contact between the male and female molds during casting, which particularly involves the provision of a negative draft angle on the inner surface of the female mold's outer wall, or, alternatively, texturing which is applied to that inner surface so that it engages the outer edge at the top of the male mold during assembly. Yet another important feature of the invention is a structure for achieving axial and rotational orientation to produce lens edge geometries without unwante…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.