Corneal surgery device and method

A - Human Necessities – 61 – N

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A61N 5/06 (2006.01) A61F 9/00 (2006.01) A61F 9/01 (2006.01) B23K 26/06 (2006.01) A61B 17/00 (2006.01) A61F 9/008 (2006.01) A61B 17/36 (1990.01)

Patent

CA 2123008

A laser-based method and apparatus for corneal surgery. The present invention is intended to be applied primarily to ablate organic materials, and human cornea in particular. The invention uses a laser source which has the characteristics of providing a shallow ablation depth (0.2 microns or less per laser pulse), and a low ablation energy density threshold (less than or equal to about 10 mJ/cm2), to achieve optically smooth ablated corneal surfaces. The preferred laser in- cludes a laser (102) emitting approximately 100-50,000 laser pulses per second, with a wavelength of about 198-300 nm and a pulse du- ration of about 1-5,000 picoseconds. Each laser pulse is directed by a highly controllable laser scanning system (104).

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