초록 ▼

A device for laser-optical eye surgery includes a source (10) of pulsed femtosecond laser radiation and also optical components (12, 14, 16) for guiding the laser radiation and focusing the same onto a treatment location on or in the eye (28), the optical components including a plurality of lenses (

A device for laser-optical eye surgery includes a source (10) of pulsed femtosecond laser radiation and also optical components (12, 14, 16) for guiding the laser radiation and focusing the same onto a treatment location on or in the eye (28), the optical components including a plurality of lenses (18, 20) arranged in succession in the beam path of the laser radiation. In accordance with the invention, at least one (18) of the lenses is arranged so as to be adjustable relative to other lenses in the direction of the beam path. In particular, the adjustable lens is a first diverging lens of beam-expansion optics (12). An actuating arrangement (24) is assigned to the adjustable lens for its adjustment, for the control of which arrangement a control unit (26) is provided which is set up to access measured data concerning the topography of a surface of the eye and to control the actuating arrangement in a manner depending on the measured surface topography. The laser device enables the abandonment of a contact lens to be placed onto the eye.

대표청구항 ▼

1. A method of laser surgery on an eye, the method comprising: providing a source of pulsed femtosecond laser radiation, a plurality of lenses arranged in succession in the beam path of the laser radiation, of which at least one is arranged so as to be adjustable relative to other lenses in the dire

1. A method of laser surgery on an eye, the method comprising: providing a source of pulsed femtosecond laser radiation, a plurality of lenses arranged in succession in the beam path of the laser radiation, of which at least one is arranged so as to be adjustable relative to other lenses in the direction of the beam path, and an actuator for adjusting the at least one adjustable lens;measuring a surface topography of a surface of the eye using a measuring arrangement, wherein the measuring arrangement utilizes optical coherence tomography to measure the surface topography of the surface of the eye;monitoring a position of the eye relative to the source of pulsed femtosecond laser radiation using the measuring arrangement, wherein the measuring arrangement utilizes optical coherence tomography to monitor the position of the eye relative to the source of pulsed femtosecond laser radiation during an operation on the eye, and wherein the measuring arrangement is configured to determine the current position of the eye relative to the focusing optics during the operation by monitoring a z-position of a reference point on the surface topography of the surface of the eye using optical coherence tomography, wherein the measuring arrangement is configured to communicate data representative of the current position of the eye directly to a control unit configured to control the actuator; andcontrolling, with the control unit, the actuator to move the adjustable lens based on the measured surface topography of the eye obtained in said measuring step using optical coherence tomography and based on the position of the eye as determined in the monitoring step using optical coherence tomography to control a focus depth of the source of pulsed femtosecond laser radiation relative to the surface of the eye. 2. The method of claim 1, wherein the optical coherence tomography of the measuring arrangement has a repetition rate greater than 100 GHz. 3. The method of claim 2, wherein the step of measuring the surface topography of the eye is performed in real-time during a surgical procedure. 4. The method of claim 1, wherein the step of measuring the surface topography of the eye is performed prior to a surgical procedure. 5. The method of claim 1, wherein the step of measuring a surface topography of the surface of the eye and the step of monitoring a position of the eye relative to the source of pulsed femtosecond laser radiation are each performed without any fixation of the eye such that the eye is freely movable with respect to the source of pulsed femtosecond laser radiation. 6. The method of claim 1, wherein the surface of the eye is an outer corneal surface. 7. The method of claim 1, wherein the at least one adjustable lens comprises a diverging lens of beam-expansion optics. 8. The method of claim 7, wherein the at least one adjustable lens further comprises focusing optics positioned after the beam-expansion optics along the beam path. 9. A device for laser-optical eye surgery, comprising: a laser source configured to emit a laser beam along a beam path;beam-expansion optics in optical communication with the laser source along the beam path, the beam-expansion optics including housing having at least a diverging lens and converging lens mounted therein, wherein the converging lens is fixedly mounted with respect to the housing and wherein the diverging lens is translatable with respect to the housing along the beam path, wherein translation of the diverging lens with respect to the housing adjusts a depth of focus of the laser beam along an axis of the beam path;an actuator coupled to the diverging lens, the actuator configured to cause translation of the diverging lens with respect to the housing to adjust the depth of focus of the laser beam;a scanner in optical communication with the beam-expansion optics, the scanner configured to scan the laser beam across positions in a plane that extends perpendicular to the axis of the beam path;focusing optics having a fixed focal length in optical communication with the scanner, the focusing optics configured to focus the laser beam onto an eye of a patient based on the depth of focus defined by the beam-expansion optics and the positions in the plane perpendicular to the axis of the beam path defined by the scanner;a measuring system configured to obtain topographical data representing a topography of a corneal surface of the eye utilizing optical coherence tomography and configured to obtain current position information representing a current position of the eye relative to the focusing optics utilizing optical coherence tomography; anda control system in communication with at least the actuator, the scanner, and the measuring system, the control system configured to send z-control signals to the actuator to cause the actuator to translate the diverging lens with respect to the housing to achieve a desired depth of focus along the axis of the beam path, the control system configured to send x-y-control signals to the scanner to cause the scanner to scan the laser beam to desired positions in the plane extending perpendicular to the axis of the beam path, wherein the z-control signals and the x-y control signals are coordinated based on the topographical data and the current position information provided by the measuring system. 10. The device of claim 9, wherein the measuring system is configured to obtain the topographical data and the current position information in real-time during a surgical procedure. 11. The device of claim 10, wherein the measuring system is configured to obtain the topographical data and the current position information without fixation of the eye. 12. The device of claim 10, wherein the measuring system is configured to obtain the topographical data and the current position information with the eye held in a fixed position relative to the focusing optics. 13. The device of claim 9, wherein the current position information representing a current position of the eye relative to the focusing optics includes position information regarding at least one reference location on the corneal surface of the eye. 14. The device of claim 9, wherein the z-control signals supplied to the actuator have a triangular graphical profile with a varying maximum amplitude over time when the laser beam is guided through a plurality of line scans. 15. The device of claim 9, wherein the z-control signals supplied to the actuator have a straight line graphical profile with a constant slope over time when the laser beam is guided through a spiral scan. 16. The device of claim 9, wherein the control system is in communication with the measuring system via a memory unit. 17. The device of claim 9, wherein the measuring system is in communication with the control system such that the topographical data and current position information are provided directly to the control system from the measuring system. 18. The device of claim 9, wherein the measuring system is configured to obtain the current position information representing the current position of the eye relative to the focusing optics by monitoring a z-position of a reference point on the corneal surface of the eye.