Uniform-radiation caustic surface for photoablation

Details Uniform-radiation caustic surface for photoablation Uniform-radiation caustic surface for photoablation

1992-01-23

1996-02-13

Shay, David M.

Surgery

Instruments

Light application

606 3, 606 13, 606 17, 606 18, 2191216, 21912174, 21912175, 21912177, 21912183, A61M 506

Patent

active

054908493

ABSTRACT:
A simultaneously generated caustic surface comprised of high energy photons is created for the purpose of ablating organic materials to within optical accuracies. The apparatus and method are principally for modifying, in vivo, the anterior cornea of the eye to effect refractive correction thereof. A catadioptric system in tandem with a continuously adjustable system of lenses provides a range of spherical or aspherical caustic curvatures throughout which range relatively uniform radiation intensity is maintained over the entire caustic. Ablation monitoring uses both visual and interferometric means; control is performed using interferometry in conjunction with a computer controlled excimer laser.

REFERENCES:
patent: 4724522 (1988-02-01), Belgorod
patent: 4887592 (1989-12-01), Loertscher
patent: 5102409 (1992-04-01), Balgorod
patent: 5141506 (1992-08-01), York

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