Device and method for laser assisted deep sclerectomy

Abstract

An ophthalmic laser ablation system is described with various optional features, some especially suitable for non-penetrating filtration on an eye. In one example, focusing of an ablation laser uses a movable lens coupled to a pair of converging light sources, which converge at the focal distance of the lens. In another example, laser ablation settings are selected for optimal ablation and minimal amount of thermal damage of a layer of percolating scleral tissue.

1 .- 91 . (canceled) 
     
     
         92 . A method, comprising:
 providing a laser scanner, wherein the laser scanner is configured to allow to control a direction of at least two beams that are generated from at least two light sources;   identifying a target ablating area of an eye overlying at least one of a Schlemm canal and a trabecular meshwork; and   utilizing the laser scanner to control the direction of the at least two beams to ablate at least a portion of a scleral tissue overlying a percolation layer above one or both of the Schlemm canal and the trabecular meshwork in the target ablating area of the eye so as to achieve, without a full thickness penetration of the Schlemm's canal or the trabecular meshwork, a percolation of an aqueous humor of the eye to reduce an elevated intra-ocular pressure while causing a minimal thermal damage to the percolation layer and surrounding tissue.   
     
     
         93 . The method of  claim 92 , further comprising a step of applying to an area of scleral tissue ablated an amount of at least one material chosen from a group consisting of anti-inflammatory materials and anti-proliferation materials sufficient to reduce scarring. 
     
     
         94 . The method of  claim 92 , wherein the identified target ablating area includes a concave portion following an outer curvature of a limbus. 
     
     
         95 . The method of  claim 92 , wherein at least one of the at least two beams is a carbon dioxide laser.