Method and system for scanning non-overlapping patterns of laser energy with diffractive optics
US6491686B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 28, 2000 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Mar 28, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2009/00872
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A system for laser treatment of the eye comprises one or more diffractive optical elements for producing unique treatment segments within an ablation zone on the eye. The treatment segments may be annular, pie-shaped, or have other geometries or patterns selected to apply energy in a particular manner, usually in a non-overlapping manner so that energy dosages can be precisely controlled. In a first embodiment of the system, a single diffractive optical element is used and a beam expander expands or converges the beam to achieve the different treatment segments. In a second embodiment, a plurality of diffractive optical elements are used, each of which produces a single treatment segment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.