Surgery – Instruments – Light application
Patent
1995-06-07
1998-01-27
Shay, David M.
Surgery
Instruments
Light application
606 2, 606 3, 606 16, 606 18, A61N 503
Patent
active
057117624
ABSTRACT:
An argon-fluoride excimer laser or other laser source capable of generating far-ultraviolet radiation at 193 nm is pulsed with energy densities of greater than 20 mj per cm.sup.2 at a repetition rate up to 25 pulses per second to direct its radiation through a mask and onto corneal tissue, or other biological matter, to form an ablation therein of predetermined configuration and depth by a process of ablative photodecomposition. The masks are formed with a slit, circular, crescent or other openings of widths between 30 and 800 microns, and may even be formed to provide a graded intensity center to edge. The mask is reflective or composed of or faced with an organic polymer to prevent heat build-up. Each micron of the depth of a 200 micron deep groove formed in corneal tissue, for example, resulted from the application of 1 joule per square centimeter of radiation, from a series of pulses delivered at intensities of between 100 mj and 200 mj per square centimeter, and at a laser pulse rate of between 1 and 25 Hertz, the entire groove taking 100 seconds.
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Facsimile letter dated Jun. 7, 1994 from Howard L. Milhench, attorney for VISX Corporation, to the European patent office containing applicant's preliminary response to an opposition by Summit Technology, Inc. to European patent application No. 86307420.9-2305/021842.
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Facsimile letter dated Jun. 2, 1994 from Howard L. Wibench, attorney for VISX Corporation, to the European patent office containing VISX's preliminary response to (1) an opposition by Firma Carl Zeiss and (2) an opposition by Summit Technology, Inc. to European patent application No. 87310283.4-0274205.
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Facsimile message dated Dec. 23, 1991 from Howard L. Milhench, attorney for VISX Corporation, to the European patent ofice containing VISX's observations regarding (1) an opposition by Synthelabo, Paris (FR) and (2) an opposition by Zeiss, Oberkochen (DE) to European patent application No. 896304315.4-2305.
Rebuttal Expert of Dr. Michael S. Feld Re: Validity; Civil Action No. 95-524-SLR; United States District Court for the District of Delaware; Dec. 30, 1996.
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Shay David M.
VISX Incorporated
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