Laser surgical probe for use in intraocular surgery

US5738676A · kind A · utility

Inventors

• Daniel X. Hammer · Bedford, US
• Cynthia A. Toth · Chapel Hill, US
• William P. Roach · San Antonio, US
• Gary Noojin · Universal City, US

Key dates

• Filing date: Jan 3, 1995
• Grant date: Apr 14, 1998
• Expiry date: Jan 3, 2015

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B18/26
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A novel microfocusing laser surgical probe for use in intraocular surgery combines a high power laser with a gradient index (GRIN) lens to provide sufficient energy density at a focal point inside the eye to achieve laser induced breakdown and destroy fibrovascular membranes resulting from diabetes and other diseases. The gradient index lens steeply focuses the light close to its end so that the energy density of the light widely diverges beyond the focal point to reduce the potential for damage to the underlying retina. The gradient index lens also focuses the light far enough from the end of the lens to prevent damage to the lens itself. In a first embodiment, an open transmission line couples a YAG laser to a gradient index lens so that the light is still collimated when it strikes the lens. This first probe may be articulated by the use of mirrors or other optical devices. In a second embodiment, a tapered optical fiber couples a YAG laser to a gradient index lens to increase the maneuverability of the probe. An air gap separates the end of the optical fiber from the lens to better couple the light energy output from the optical fiber to the lens.