Surgery – Instruments – Light application
Patent
1987-10-16
1992-04-28
Shay, David M.
Surgery
Instruments
Light application
606 13, 606 3, 128395, A61N 506
Patent
active
051083884
ABSTRACT:
An argon-flouride 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 a groove 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.
REFERENCES:
patent: 3710798 (1973-01-01), Bredemeier
patent: 3769963 (1973-11-01), Goldman et al.
patent: 4170997 (1979-10-01), Pinnow et al.
patent: 4258334 (1981-03-01), McCusker et al.
patent: 4266548 (1981-05-01), Davi
patent: 4309998 (1982-01-01), Aron nee Rosa et al.
patent: 4326529 (1982-04-01), Doss et al.
patent: 4331937 (1982-05-01), Brown et al.
patent: 4381007 (1983-04-01), Doss
patent: 4409979 (1983-10-01), Roussel et al.
patent: 4461294 (1984-07-01), Baron
patent: 4665913 (1987-05-01), L'Esperance
patent: 4729372 (1988-03-01), L'Esperance
patent: 4732148 (1988-03-01), L'Esperance
patent: 4769963 (1988-09-01), Goldman et al.
"Response of the Corneal Epithelium to KrF Excimer Laser Pulses", J. Taboada et al., Health Physics, vol. 40, May 1981, pp. 677-683.
"Far UV Photoetching of Organic Material" Srinwasan et al., Laser Focus, May 1983.
"Excimer Laser Surgery of the Cornea" by Stephen Trokel et al., pp. 710-715, American Journal of Ophthalmology, vol. 96, No. 6, Dec. 1983.
"An Extreme Sensitivity in the Corneal Epithelium To Far UV ArF Excimer Laser Pulses" by Taboada et al., Proc. of the Scientific Program Aerospace Medial Association, 1981 meeting pp. 98-99.
Shay David M.
VISX Incorporated
LandOfFree
Laser surgery method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Laser surgery method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laser surgery method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1244710