Refractive surgery and presbyopia correction using infrared and ultraviolet lasers

a presbyopia correction and infrared laser technology, applied in the field of refractive surgical systems, can solve the problems of short lifetime of laing gas, unstable and short laing gas life, uv laser system, etc., and achieve the effect of reducing the thermal effect of the corneal tissue, reducing the shock wave and uneven hydration level on the corneal surface, and easy assignmen
USRE40184E1Inactive Publication Date: 2008-03-25SURGILIGHT
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
SURGILIGHT
Publication Date
2008-03-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method and surgical technique for corneal reshaping and for presbyopia correction are provided. The preferred embodiments of the system consists of a scanner, a beam spot controller and coupling fibers and the basic laser having a wavelength of (190-310) nm, (0.5-3.2) microns and (5.6-6.2) microns and a pulse duration of about (10-150) nanoseconds, (10-500) microseconds and true continuous wave. New mid-infrared gas lasers are provided for the corneal reshaping procedures. Presbyopia is treated by a method which uses ablative laser to ablate the sclera tissue and increase the accommodation of the ciliary body. The tissue bleeding is prevented by a dual-beam system having ablative and coagulation lasers. The preferred embodiments include short pulse ablative lasers (pulse duration less than 200 microseconds) with wavelength range of (0.15-3.2) microns and the long pulse (longer than 200 microseconds) coagulative lasers at (0.5-10.6) microns. Compact diode lasers of (980-2100) nm and diode-pumped solid state laser at about 2.9 microns for radial ablation patterns on the sclera ciliary body of a cornea are also disclosed for presbyopia correction using the mechanism of sclera expansion.
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Description

[0001] The questions raised in reexamination request 90 / 006,089, filed Aug. 21, 2001 have been considered and the results thereof are reflected in this reissue patent which constitutes the reexamination certificate required by 35 U.S.C. 307 as provided in 37 CFR 1.570(e), for ex parte reexaminations, or the reexamination certificate required by 35 U.S.C. 316 as provided in 37 CFR 1.997(e) for inter partes reexaminations.<?insert-end id="INS-S-00001" ?>BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to refractive surgical systems using low-power, infrared and ultraviolet lasers in a predetermined scanning patterns in procedures of photorefractive keratectomy (PRK), laser assisted in situ keratomileusis (LASIK) and laser sclera expansion (LASE), a new procedure for presbyopia correction.

[0004] 2. Prior Art

[0005] Refractive surgeries (or corneal reshaping) including a procedure called photorefractive keratectomy (PRK) and a more recent p...

Claims

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