System and method for detecting, correcting and measuring depth movement of target tissue in a laser surgical system
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01S-017/08
출원번호
US-0655919
(1991-02-19)
발명자
/ 주소
Fountain William D. (Fremont CA)
출원인 / 주소
Phoenix Laser Systems, Inc. (San Francisco CA 02)
인용정보
피인용 횟수 :
74인용 특허 :
0
초록▼
A system and method for detecting, measuring and correcting for movements of a target in a medical analytic or surgical system utilizes generally the principles of confocal microscopy. A pinhole and photodetector combination is positioned behind optics of a system for delivering an ophthalmic surger
A system and method for detecting, measuring and correcting for movements of a target in a medical analytic or surgical system utilizes generally the principles of confocal microscopy. A pinhole and photodetector combination is positioned behind optics of a system for delivering an ophthalmic surgery laser beam, for example. As in a confocal microscope, the optics are arranged such that a beam waist is formed precisely at the pinhole when the target is in its nominal position. When the target moves from its nominal position in the depth direction, the signal from the pinhole/photodetector combination decreases. The change in the signal can be used to drive the objective lens of the optics so as to move with the moving target. Alternatively, the signal can be used to drive the pinhole/photodetector assembly so as to again attain peak signal, in this way allowing the target\s shift to be measured.
대표청구항▼
An optical system for detecting and correcting for movements in a depth direction of a target at which a treatment laser beam is directed, the treatment laser beam passing through a common objective lens with the optical system, comprising, objective lens means at the front of the optical system, to
An optical system for detecting and correcting for movements in a depth direction of a target at which a treatment laser beam is directed, the treatment laser beam passing through a common objective lens with the optical system, comprising, objective lens means at the front of the optical system, to be positioned adjacent to a target lying on an optical axis of the objective lens means and genteelly at the focus of the objective lens means, illumination means for sending an illuminating light beam toward the target through the objective lens means, to an illuminating beam focus at the position of a reflective surface associated with the target when the target is in a nominal position, optical means behind the objective lens means for receiving light reflected from the reflective surface associated with the target and passed through the objective lens means and for focussing the reflected light to a rear focus or beam waist, a pinhole structure with a pinhole located at the beam waist when the target is in a nominal position with the reflective surface at the illuminating beam focus, photodetector means behind the pinhole structure and positioned to receive the illuminating beam as reflected from the reflective surface of the target and passed through the objective lens means, the optical means and the pinhole, the photodetector means including means for measuring the intensity of light received through the pinhole, treatment laser means for producing a treatment laser beam, with means for folding the treatment laser beam into the optical system so as to pass the treatment laser beam through the objective lens means toward a treatment laser focus at the target, with other optical means for steering the treatment laser beam independently of the illuminating light beam, and target following means connected to the photodetector means and including driving means for moving the objective lens means outwardly toward the target or inwardly away from the target so as to maintain essentially constant focus of the illuminating light beam on the target, the target following means including feedback means responsive to a reduction in light intensity at the photodetector means, for moving the objective lens means until the light level sensed at the photodetector means is maximized, indicating the location of the beam waist at the pinhole and the location of the reflective surface at the focus of the illuminating light beam, whereby the focus of the treatment laser beam is properly relocated relative to the target as desired.
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