초록 ▼

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 wai

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.

대표청구항 ▼

An ophthalmic endophotocoagulation probe for the application of light energy of a desired power to a target region of tissue within the eye of a subject, such probe comprising a handle a probe tip having an elongate hollow and substantially rigid outer body carried by said handle and extending from

An ophthalmic endophotocoagulation probe for the application of light energy of a desired power to a target region of tissue within the eye of a subject, such probe comprising a handle a probe tip having an elongate hollow and substantially rigid outer body carried by said handle and extending from said handle to a distal light output end said outer body having a diameter and a length for insertion into the eye and manipulation therein by said handle a graded index convergent lens included in the light output end of said probe tip, said lens constituting a light transmissive window closing said outer body to provide a sealed enclosed region within said outer body, said graded index lens having a first end face facing outwardly of said enclosed region and defining an extreme extension of said probe tip and a second end face facing inwardly and defining an end wall of said enclosed region a light conducting fiber extending within said enclosed region to a light emitting fiber end, means included in said handle for causing relative motion of said fiber and said outer body to axially position said light emitting fiber end and said second end face at a spacing effective to project an output beam having a desired light energy in a defined region spaced from said first face for treating eye tissue.