Endophotocoagulation probe

Details Endophotocoagulation probe Endophotocoagulation probe

1987-04-16

1989-09-12

Cohen, Lee S.

Surgery

Truss

Pad

128398, A61N 506

Patent

active

048650293

ABSTRACT:
An endophotocoagulation probe has a probe tip adapted for insertion into the eye of a subject, and includes an optical fiber for carrying light, and a lens for focusing the light from the end of the fiber onto target tissue at a desired working distance. The lens forms a convergent beam with the waist of the beam providing a spot of maximum power density whose size is independent of the ocular medium. In a preferred embodiment a positioner provides selective variation of the spacing between the lens and the fiber to select a desired spot size. Preferably the lens is a selfocal or rod lens. A step-positioning handle selects one of a plurality of determined spacings, so as to achieve plural different spot sizes, each having a predetermined power density. Examples of probes having variable spot sizes in ranges from 50 to 500 microns are described with particular fibers and selfocal lens elements. A microprocessor may control lens position and light input power in accordance with the selected spot size. The operator may select a collimated, or different divergent or convergent beams, without withdrawing the instrument from the eye.

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