Intraocular lens with dual 360 degree haptics
US5366501A · kind A · utility
Inventor
Key dates
| Filing date | May 12, 1993 |
| Grant date | Nov 22, 1994 |
| Priority date | — |
| Expiry date | May 12, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2002/1699
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A posterior chamber intraocular lens (IOL) designed for in-the-bag implantation has a central optic and a surrounding pair of 360.degree. haptics constituted by two concentric endless rings of different diameters. The outer diameter of the outer ring is slightly larger than the inner diameter of the capsular bag at the equator thereof, and the plane of the outer ring is anteriorly offset relative to the plane of the inner ring. When the IOL is properly implanted, the outer ring presses against the interior surface of the equatorial region of the capsular bag without unfurling the anterior capsular flap and constitutes a primary mechanical barrier to the migration of epithelial cells from the equatorial region into the optic region of the posterior capsule, while the inner ring presses against the anterior surface of the posterior capsule a short distance away from the equatorial region and constitutes a secondary mechanical barrier to the migration of epithelial cells which may not have been blocked by the primary barrier, thereby to inhibit capsular fibrosis and posterior capsular opacification. The haptics also serve to maintain the posterior capsule flush and taut against the op…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.