Soft intracameral lens
US4955903A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1989 |
| Grant date | Sep 11, 1990 |
| Priority date | — |
| Expiry date | Jul 12, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2230/0071
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention pertains to a soft intracameral lens intended for location in the posterior chamber of the eye. The soft intracameral hydrogel lens has a front supporting and centering convex part intended for leaning against the iris having a rotational symmetrical shape of a sphere, paraboloid, or hyperboloid and passing into the broadest circumference by a surface, the shape of this surface being equal to or approaching the shape of the lateral area of a cone, while the hinder, or rear, supporting part of the lens has a spherical, planar, or moderately convex or concave-curved shape and a large surface area for leaning against a hinder capsula or a membrane of the vitreous body. The hinder supporting part is broadened and forms on its edge a retaining ring which reaches over the front part by as much as 1.5 mm, whereas the central thickness of the lens ranges between 1 to 3.5 mm. The surface of the soft intracameral lens may be formed, at least in part, from a soft hydrogel containing at least 70% water at 20.degree.C. in the state of equilibrium swelling. The lens may have a spherical shape and be provided on the circumference with a supporting collar manufactured from a soft hyd…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.