Laser delivery system for eye surgery

摘要

A photodisruptive laser delivery system and method for use in eye surgery. The photo disruptive laser delivered in pulses in the range of <10000 femtoseconds, used to create incisions in eye tissue is delivered by novel means to minimize optical aberrations without the use of a complex system of multiply precisely arranged lenses. This novel means include a scanning design that allows the focusing lens to always remain under normal incidence to the photodisruptive laser beam, negating the need for overly complex aberration correction set up. The focusing lens is configured to move within a surrounding beam to facilitate two dimensional controls over the treatment space. Controlling beam divergence prior to focusing allows for 3D incisions. The system and methods of use accomplish precise treatment without the need to contact the patient and can be integrated into standard surgical microscopes to improve operational efficiency and hospital workflow.

主权项

1. A method for forming a cylindrical incision in eye tissue, the method comprising:
directing a femtosecond laser beam along a beam axis in an axial direction through at least one expanding lens and through a focusing lens toward the eye tissue, wherein the laser beam has a beam diameter; moving the focusing lens during the application of the laser over a circular path while maintaining the beam in a fixed position, wherein a plane of the circular path of the focusing lens is perpendicular to the axial direction of the laser beam, wherein the focusing lens focuses at least a portion of the laser beam to a spot within the eye tissue, and wherein the spot has a size configured to photo-disrupt the eye tissue along a two dimensional path determined by the circular path of the focusing lens; and moving the focusing lens or at least one of the expanding lenses in the axial direction of the beam axis to control a depth position of focus of the laser spot to create a three dimensional cylindrical treatment area within the eye tissue.