An operation apparatus for ablating the cornea by laser beam and correcting ametropia of the eye comprising a diaphragm with variable aperture, which is disposed on the optical path along which the laser beam is irradiated on the cornea, a shading member for shading the aperture of the diaphragm in
An operation apparatus for ablating the cornea by laser beam and correcting ametropia of the eye comprising a diaphragm with variable aperture, which is disposed on the optical path along which the laser beam is irradiated on the cornea, a shading member for shading the aperture of the diaphragm in the meridian diameter direction of the aperture, which is capable of varying the shading area to the aperture of the diaphragm by changing the turning angle to the optical path, in which aperture diameter of the diaphragm and variation in scope of the shading area by the shading member being controlled, and a beam rotator disposed in the eye side to the diaphragm rotates the laser beam passed through the aperture of the diaphragm about the optical path, whereby the cornea is ablated thicker at the periphery than at the center so as to correct hypermetropia.
대표청구항▼
1. An apparatus for ablating the cornea of an eye by a laser beam of ultraviolet rays to correct hypermetropia of the eye, comprising:a laser source for emitting a laser beam; a an optical system for reflecting and directing the laser beam onto a cornea;a diaphragm for restricting an irradiati
1. An apparatus for ablating the cornea of an eye by a laser beam of ultraviolet rays to correct hypermetropia of the eye, comprising:a laser source for emitting a laser beam; a an optical system for reflecting and directing the laser beam onto a cornea;a diaphragm for restricting an irradiation area within a circle area about an apex of the cornea, disposed in an optical path of the optical system;irradiation area restricting means having a beam shading boundary line intersecting the meridian of the cornea at right angles, disposed in the optical path of the optical system, the means restricting the irradiation area of the laser beam with the irradiation boundary line intersecting the meridian of the cornea in cooperation with the diaphragm and changing a distance from the apex of the cornea to the irradiation boundary line;beam rotating means for rotating the irradiation area of the laser beam formed by the diaphragm and the irradiation area restricting means about the apex of the cornea, the beam rotating means being controlled to cover all meridians of the cornea and to be in a same depth at a position of the same radius as one cycle of the irradiation of the laser beam; andcontrol means for controlling the laser source, the irradiation area restricting means and the beam rotating means to provide a first small amount of irradiation at a central portion of the cornea and to provide a second amount of irradiation larger than said first amount around a peripheral portion thereof, so that the curvature of the cornea's optical zone is made larger than before the cornea is ablated. 2. The apparatus according to claim 1, wherein the laser source comprises an argon-fluorine argon- fluoride excimer laser oscillator. 3. The apparatus according to claim 1, wherein the beam rotating means comprises an image rotator for rotating the laser beam, disposed in a down stream against the diaphragm and the irradiation area restricting means. 4. An apparatus for use in ablating a cornea of an eye by a laser beam emitted from a laser source and passed along an optical path onto the cornea to correct ametropia of the eye comprising: a diaphragm with a variable diameter aperture disposed in the optical path along which the laser beam is passed onto the cornea; a movable shading element disposed in the optical path which shades a portion of the aperture of the diaphragm and which varies a width of the shaded portion of the aperture when moved, said shaded portion extending along a meridian diameter of the aperture; a controller connected to the diaphragm and the shading element which controls the aperture diameter and moves the shading element to vary the width of the shaded area; a beam rotator for rotating the resulting laser beam about the optical path and on the cornea; and a control device which controls the beam rotator to rotate the laser beam on the cornea so that the depth of an area of the cornea ablated by the laser beam is substantially uniform in the laser beam rotating direction when the beam rotator has rotated the laser beam 360 °, whereby the cornea can be ablated more at its periphery than at its center so as to correct hypermetropia. 5. An apparatus for ablating a cornea by a laser beam and for correcting ametropia, comprising: a laser source for emitting the laser beam along an optical path; a diaphragm with a variable diameter aperture, disposed in the optical path of the laser beam; a movable shading element which shades a portion of the aperture extending along a meridian diameter of the aperture and which varies a width of the shaded area of the aperture when moved; a controller connected to the diaphragm and the shading element for controlling the aperture diameter and moving the shading element to vary the width of the shaded area; a beam rotator for rotating the resulting laser beam about the optical path and on the cornea; and a control device which controls the beam rot ator to rotate the laser beam on the cornea so that the depth of an area of the cornea ablated by the laser beam is substantially uniform in the laser beam rotating direction when the beam rotator has rotated the laser beam 360 °, whereby the cornea can be ablated more at its periphery than at its center so as to correct hypermetropia. 6. An apparatus for use in ablating a cornea of an eye by a laser beam emitted from a laser source and passed along an optical path onto the cornea to correct ametropia of the eye, comprising: a diaphragm with a variable diameter aperture disposed in the optical path along which the laser beam is passed onto the cornea; a movable shading plate disposed in the optical path for shading a portion of the aperture of the diaphragm extending along a meridian diameter of the aperture and varying a width of the shaded area of the aperture when moved; a controller connected to the diaphragm and the shading plate which controls the aperture diameter and moves the shading plate to vary the width of the shaded area; a beam rotator for rotating the resulting laser beam about the optical path and on the cornea; and a control device which controls the beam rotator to rotate the laser beam on the cornea so that the depth of an area of the cornea ablated by the laser beam is substantially uniform in the laser beam rotating direction when the beam rotator has rotated the laser beam 360 °, whereby the cornea can be ablated more at its periphery than at its center so as to correct hypermetropia. 7. An apparatus for ablating a cornea by a laser beam and for correcting ametropia, comprising: a laser source for emitting the laser beam along an optical path; a diaphragm with a variable diameter aperture, disposed in the optical path of the laser beam; a movable shading plate which shades a portion of the aperture extending along a meridian diameter of the aperture and which varies a width of the shaded area of the aperture when moved; a controller connected to the diaphragm and the shading plate for controlling the aperture diameter and moving the shading plate to vary the width of the shaded area; a beam rotator for rotating the resulting laser beam about the optical path and on the cornea; and a control device which controls the beam rotator to rotate the laser beam on the cornea so that the depth of an area of the cornea ablated by the laser beam is substantially uniform in the laser beam rotating direction when the beam rotator has rotated the laser beam 360 °, whereby the cornea can be ablated more at its periphery than at is center so as to correct hypermetropia. 8. An apparatus for ablating a cornea of an eye by a laser beam of ultraviolet rays to correct hypermetropia of the eye, comprising: a laser source for emitting a laser beam; an optical system for reflecting and directing the laser beam onto a cornea; a diaphragm for restricting an irradiation area within a circle area about an apex of the cornea, disposed in an optical path of the optical system; an irradiation area restricting element having a beam shading boundary line intersecting the meridian of the cornea at right angles and being disposed in the optical path of the optical system, when the irradiation area restricting element operates in cooperation with the diaphragm to change a distance from the apex of the cornea to the irradiation boundary line; a beam rotator which rotates the irradiation area of the laser beam about the apex of the cornea; and a controller which controls the laser source, the irradiation area restricting element and the beam rotator so as to increase the curvature of the cornea. 9. An apparatus for ablating a cornea of an eye by a laser beam of ultraviolet rays to correct hypermetropia of the eye, comprising: a laser source for emitting a laser beam; an optical system for reflecting and directing the laser beam onto a cornea; a diaphragm for restricti ng an irradiation area within a circle area about an apex of the cornea, disposed in an optical path of the optical system; an irradiating area restricting plate having a beam shading boundary line intersecting the meridian of the cornea at right angles and being disposed in the optical path of the optical system, wherein the irradiation area restricting plate operates in cooperation with the diaphragm to change a distance from the apex of the cornea to the irradiation boundary line; a beam rotator which rotates the irradiation area of the laser beam about the apex of the cornea; and a controller which controls the laser source, the irradiation area restricting plate and the beam rotator so as to increase the curvature of the cornea.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (12)
Nakamura Takua (Aichi JPX) Sumiya Toshifumi (Aichi JPX), Ablation apparatus for ablating a cornea by laser beam.
Azema Alain (28 ; avenue des Arnes Nice FRX) Botineau Jean (5 ; avenue Chateaubriand Nice FRX) Moulin Grard (167 ; avenue Marchal Lyautey Nice FRX), Optical system for use in a surgical apparatus.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.