Cast molding of intraocular lenses

Details Cast molding of intraocular lenses Cast molding of intraocular lenses

1994-11-29

1997-04-15

Mackey, James P.

Plastic article or earthenware shaping or treating: apparatus

Press forming apparatus having opposed press members

Opposed, registering, coacting mold cavities

249 53R, 249117, 249160, 249168, 425412, 425808, B29D 1100

Patent

active

056207204

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 unwanted steps on the lens edge. The alignment is achieved with interlocking steps on the male and female molds. The interlocking elements may be pins or annular elements.

REFERENCES:
patent: 1577132 (1926-03-01), Lawton
patent: 1653396 (1927-12-01), Edwards
patent: 3605195 (1971-09-01), Campbell
patent: 3915609 (1975-10-01), Robinson
patent: 4095772 (1978-06-01), Weber
patent: 4121896 (1978-10-01), Shepherd
patent: 4197266 (1980-04-01), Clark et al.
patent: 4201289 (1980-05-01), Mack et al.
patent: 4208364 (1980-06-01), Shepherd
patent: 4209289 (1980-06-01), Newcomb et al.
patent: 4211384 (1980-07-01), Bourset et al.
patent: 4265850 (1981-05-01), Coulon et al.
patent: 4285890 (1981-08-01), Mizutani et al.
patent: 4390482 (1983-06-01), Feurer
patent: 4469646 (1984-09-01), Rawlings
patent: 4534723 (1985-08-01), Dillon et al.
patent: 4761069 (1988-08-01), Truong et al.
patent: 4815690 (1989-03-01), Shepherd
patent: 4865779 (1989-09-01), Ihn et al.
patent: 4955580 (1990-09-01), Seden et al.
patent: 5087015 (1992-02-01), Galley
patent: 5147397 (1992-09-01), Christ et al.
patent: 5185107 (1993-02-01), Blake
patent: 5192318 (1993-03-01), Schneider et al.
patent: 5236970 (1993-08-01), Christ et al.
patent: 5255888 (1993-10-01), Workman

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