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    2.
    发明专利
    未知

    公开(公告)号：DE69506128D1

    公开(公告)日：1998-12-24

    申请号：DE69506128

    申请日：1995-12-04

    Applicant: SUMMIT TECHNOLOGY INC

    Inventor： MULLER DAVID

    IPC: A61B18/20 ,  A61F9/007 ,  A61F9/01 ,  B23K26/073 ,  G02B3/04 ,  A61F9/00

    Abstract: 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.

    SURGICAL MICROTOMES
    3.
    发明专利
    SURGICAL MICROTOMES 未知

    公开(公告)号：CA2292585A1

    公开(公告)日：1998-12-03

    申请号：CA2292585

    申请日：1998-06-01

    Applicant: SUMMIT TECHNOLOGY INC

    Inventor： KLOPOTEK PETER J

    IPC: A61B17/3211 ,  A61B17/08 ,  A61B17/30 ,  A61B17/32 ,  A61F9/007 ,  A61F9/013

    Abstract: Methods and apparatus are diclosed for removal of biological tissue slices or layers, preferably in the form of lamellar sections (4) of predetermined shape and thickness employing a reference member (12) that engages a target tissue site and cooperates with a cutter (14) in order to remove the tissue segment or lamella. The cutter can include a flexible cutting element such as a wire or band element that is brought into physical contact with a guiding edge (8) integrated with, or otherwise coupled to, the reference member. Alternatively, the cutter can include a stiff rigid blade element (14B) that is maintained in contact with the guiding edge. The cutter is drawn along a path defined by the guide edge through the tissue to sever, at least partialy, a tissue section. In one particularly useful aspect of the invention, devices for keratectomy are diclosed employing an ocular reference member that engages the upper central region of the cornea and cooperates with a cutter to remove a lamellar segment from the cornea. Such lamellar resections are useful in preparing the cornea for further surgery (by mechanical or laser surgical techniques), or in performing refractive keratectomy directly upon the eye, or in treating (e.g., smoothing) the corneal surface to correct abnormalities, (e.g., to remove ulcerated tissue or otherwise improve the optical properties of the cornea).

    SYSTEM FOR CORNEAL REPROFILING
    6.
    发明专利
    SYSTEM FOR CORNEAL REPROFILING 未知

    公开(公告)号：CA2206868A1

    公开(公告)日：1996-06-13

    申请号：CA2206868

    申请日：1995-12-04

    Applicant: SUMMIT TECHNOLOGY INC

    Inventor： MULLER DAVID F

    IPC: A61B18/20 ,  A61F9/007 ,  A61F9/01 ,  B23K26/073 ,  G02B3/04 ,  A61F9/013

    Abstract: 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 an inner to an outer segment of the annular beam to create a blend zone, thereby providing a smooth transition between the reprofiled 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 nonuniform profile, or by modifying the shape of either the front face or the rear face of the optical element.

    Control of photorefractive keratectomy
    8.
    发明专利
    Control of photorefractive keratectomy 未知

    公开(公告)号：AU2276395A

    公开(公告)日：1995-10-30

    申请号：AU2276395

    申请日：1995-04-07

    Applicant: SUMMIT TECHNOLOGY INC

    Inventor： MULLER DAVID F ,  SACHAROFF ALEX C ,  KLOPOTEK PETER J

    IPC: A61B17/00 ,  A61B19/00 ,  A61F9/01 ,  A61N5/02 ,  A61N5/06

    Abstract: A method and system are described for performing photorefractive keratectomy procedure employing pulses of photoablative radiation to selectively ablate corneal tissue of a patient's eye in an ablation zone on the anterior corneal surface to produce a desired refractive correction in the corneal tissue. The method and system employ control of the effect of ocular fluid at the corneal surface so as to reduce the disturbance of such fluid on the desired ablation process while maintaining hydration of the corneal tissue. Controlling the average repetition rate of the radiation pulses applied to the corneal surface so as to reduce intrapulse fluid accumulation at the corneal surface without dehydrating the corneal tissue, selecting an increased fluence level of the pulse applied to the corneal surface to reduce the effect of fluid accumulation at the corneal surface, and applying evaporative energy to the site of incidence of a pulse of an ablative beam prior to incidence of said pulse at said site are shown as ways to effect this control. Application of the new method and system to wide area ablation techniques and to scanning techniques are described Reduction of irregularities when ablating large areas, e.g., grater than 5.5 cm is made possible in either case.

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