Refractive surgery and presbyopia correction using infrared and ultraviolet lasers
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A61B-018/18
출원번호
US-0621105
(2003-07-10)
등록번호
US-RE40184
(2008-03-25)
발명자
/ 주소
Lin,Jui Teng
출원인 / 주소
SurgiLight, Inc.
대리인 / 주소
Knobbe, Martens, Olson & Bear LLP
인용정보
피인용 횟수 :
17인용 특허 :
36
초록▼
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
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.
대표청구항▼
I claim: 1. A method of performing refractive surgery by reshaping a portion of corneal tissue, said method comprising the steps of: selecting a gas laser generated by transverse electrical discharge in a mixture of neural gases including at least helium gas and having a pulsed output beams of pred
I claim: 1. A method of performing refractive surgery by reshaping a portion of corneal tissue, said method comprising the steps of: selecting a gas laser generated by transverse electrical discharge in a mixture of neural gases including at least helium gas and having a pulsed output beams of predetermined mid-IR wavelength of (2.7-3.2) microns; selecting a beam spot controller mechanism, said spot controller consisting of an internal magentic coupler integrated inside the laser cavity having a pin-hole size of about (2-10) mm; focusing the output beam to a spot size of about (0.05-2.5) mm on the corneal surface; selecting a scanning mechanism for scanning said selected laser output beam; coupling said laser beam to a scanning device for scanning said laser beam over a predetermined corneal surface area to remove corneal tissue, whereby a patient's vision is corrected by reshaping the cornea. 2. A method of claim 1, in which the hydration level of said corneal surface area is controlled by a gas blower such that a consistent tissue ablation rate can be achieved. 3. A method for improving id="DEL-S-00001" date="20080325" presbyopic patient's vision by removing a portion of the sclera tissue from an eye of a patient, said method comprising the steps ofid="DEL-S-00001" id="INS-S-00002" date="20080325" accommodation and/or treating presbyopia, the method comprisingid="INS-S-00002" : selecting an ablative laser for removing sclera tissue by focusing said ablative laser to a spot size of about (5-800) microns on the corneal surface; selecting a scanning mechanism for scanning said ablative laser; coupling said ablative laser to a scanning device for scanning said ablative laser over a predetermined area outside the corneal limbus to remove said sclera tissueid="INS-S-00003" date="20080325" ; removing sclera tissue from outside the corneal limbus area, said removing comprising forming a pattern of radial lines in the sclera to a depth of 500-600 microns, id="INS-S-00003" whereby a patient's near vision is improved by the increase of the corneal lens accommodation. 4. A method of claim 3, in which said id="INS-S-00004" date="20080325" removing is performed using an id="INS-S-00004" ablative laser id="DEL-S-00002" date="20080325" is a gas laserid="DEL-S-00002" having an output wavelength of about (2.7-3.2) microns, energy per pulse of about (0.5-15) mJ on id="INS-S-00005" date="20080325" the id="INS-S-00005" corneal surface and a pulse duration less than 150 nanoseconds. 5. A method of claim 3, in which said ablative laser is a mid-IR solid-state laser having a wavelength of about (2.7-3.2) microns. 6. The method of claim 3, in which said id="DEL-S-00003" date="20080325" ablative laser includesid="DEL-S-00003" id="INS-S-00006" date="20080325" removing is performed using id="INS-S-00006" pulsed radiation generated by id="INS-S-00007" date="20080325" a id="INS-S-00007" transverse electrical discharge carbon dioxide laser which is frequency-doubled into a laser having a wavelength of about (5.6-6.2) microns, energy per pulse of about (2-15) mJ on the corneal surface. 7. A method of claim 3, in which said id="DEL-S-00004" date="20080325" ablative laser isid="DEL-S-00004" id="INS-S-00008" date="20080325" removing is performed using id="INS-S-00008" a diode laser having a wavelength of about 980 nm. 8. A method of claim 3, in which said id="DEL-S-00005" date="20080325" ablative laser isid="DEL-S-00005" id="INS-S-00009" date="20080325" removing is performed using id="INS-S-00009" a diode laser having a wavelength of about (1.4-2.1) microns. 9. A method of claim 3, in which said id="DEL-S-00006" date="20080325" ablative laser isid="DEL-S-00006" id="INS-S-00010" date="20080325" removing is performed using id="INS-S-00010" a diode-pumped Er:YAG laser having a wavelength about 2.9 microns and a pulse duration less than 500 microseconds. 10. A method of claim 3, in which said id="DEL-S-00007" date="20080325" ablative laser isid="DEL-S-00007" id="INS-S-00011" date="20080325" removing is performed using id="INS-S-00011" an ultraviolet laser having wavelength of about (190-310) nm. 11. A method of claim 3, in which said sclera tissue is coagulated by a laser having a wavelength of about (0.5-3.2) microns, an average power of about (0.1-5.0) W on the corneal surface, spot size of about (0.1-1.0) mm, and a pulse duration longer than about 200 seconds. 12. A method of claim 3, in which said id="INS-S-00012" date="20080325" removing is performed using an id="INS-S-00012" ablative laser id="DEL-S-00008" date="20080325" isid="DEL-S-00008" fiber-coupled and combined with a coagulation laser and delivered to the id="DEL-S-00009" date="20080325" cornealid="DEL-S-00009" id="INS-S-00013" date="20080325" eye id="INS-S-00013" surface. 13. A method of claim 3, in which said sclera tissue is ablated in radial patterns having a length about (2.5-3.5) mm id="DEL-S-00010" date="20080325" and a depth about (400-700) micronsid="DEL-S-00010" . 14. A method of claim 3, in which said sclera tissue is ablated in radial patterns by a computer-controlled scanning mechanism. 15. A method of claim 3, in which said sclera tissue is ablated in radial patterns by a translation mechanism. id="INS-S-00014" date="20080325" 16. A method as in claim 3 wherein the radial lines are at least 2.5 mm in length.id="INS-S-00014" id="INS-S-00015" date="20080325" 17. A method as in claim 3 wherein the removing is performed using a pulsed laser having a pulse duration of about 10-500 microseconds.id="INS-S-00015" id="INS-S-00016" date="20080325" 18. A method as in claim 3 wherein the removing is performed using a laser focused to a spot size of about 5-500 microns.id="INS-S-00016"
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