LASER ASSISTED CATARACT SURGERY

摘要

Laser assisted cataract surgery methods and devices utilizing one or more treatment laser beams to create a shaped opening in the anterior lens capsule of the eye when performing a capsulorrhexis procedure. A light absorbing agent may optionally be added onto or into the lens capsule tissue, and the treatment laser wavelength selected to be strongly absorbed by the light absorbing agent. Alternatively, the treatment laser wavelength may be selected to be absorbed or strongly absorbed by the tissue itself, in which case no additional light absorbing agent need be used. Visualization patterns produced with one or more target laser beams may be projected onto the lens capsule tissue to aid in the procedure. The devices may be attached to or integrated with microscopes.

主权项

1. A device for creating an opening in the anterior lens capsule of the eye, the device comprising a continuous wave scanning treatment laser beam having a programmed scan profile for a predetermined treatment pattern forming a closed curve at the anterior lens capsule in a single pass, a wavelength selected to be strongly absorbed at the anterior lens capsule, and a power selected to cause thermal denaturing of collagen in the anterior lens capsule resulting in thermal tissue separation along the closed curve without ablating anterior lens capsule tissue;
wherein at the beginning of the treatment pattern the power of the treatment laser ramps up from about zero to about 90% of its full power during a period of about 5 milliseconds to about 200 milliseconds.