[특허]Corneal reprofiling using an annular beam of ablative radiation

Corneal reprofiling using an annular beam of ablative radiation 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61N-005/02
출원번호	US-0351826 (1994-12-08)
발명자 / 주소	Muller David F. (Boston MA)
출원인 / 주소	Summit Technology Inc. (Waltham MA 02)
인용정보	피인용 횟수 : 55 인용 특허 : 0

초록 ▼

Methods and systems are disclosed for corneal reprofiling employing an annular beam of ablative radiation to correct refractive errors in vision, and/or create “blend zones”in order to reduce any surface discontinuities on the cornea following hyperopia-correcting or astigmatism-correcting procedures. Preferably, the methods and systems of the present invention also operate to change the intensity distribution of the light beam, such that the annulus of radiation has a varying intensity as a function of radius and, thereby, achieves a blending or other desired effect with the least number of pulses. Methods of photorefractive keratectomy (PRK) are disclosed, including the steps of (a) selectively reprofiling a cornea of an eye by removing a volume of corneal tissue with ablative radiation to form a reprofiled region in the optical zone which steepens, at least in part, the central curvature of the cornea; and (b) applying to a peripheral region of the cornea an annular beam of ablative radiation having an intensity which varies radially from a inner to a outer segment of the annular beam to create a blend zone, thereby providing a smooth transition between the repro filed region and an unablated region of the cornea. Optical lens elements also are disclosed having a generally conic front face and a rear face which is generally perpendicular to the path of the incident beam. Light passing through this optical element will be refracted into an annular beam. Variations in the intensity profile of the annular beam can be introduced by employing an initial beam which has a non-uniform profile, or by modifying the shape of either the front face or the rear face of the optical element.

대표청구항 ▼

In a system for photorefractive keratectomy having a source of ablative laser radiation and a means for selectively reprofiling a cornea of an eye by removing a volume of corneal tissue from a region in an optical zone of the cornea with ablative radiation to form a reprofiled region which modifies, at least in part, a central curvature of the cornea; the improvement comprising means for applying to a peripheral region of the cornea an annular beam of ablative radiation having an intensity which varies radially within the annulus of the beam to create a blend zone, thereby permitting a smooth transition between the reprofiled region and an unablated region of the cornea.

이 특허를 인용한 특허 (55)

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Pallikaris,Ioannis; Ginis,Harilaos S., Device for separating the epithelium layer from the surface of the cornea of an eye.
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Steinert Roger F., Epithelium removal.
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Muller David F., Methods and systems for correction of hyperopia and/or astigmatism using ablative radiation.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Corneal reprofiling using an annular beam of ablative radiation 원문보기

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Corneal reprofiling using an annular beam of ablative radiation 원문보기

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