Laser system for corneal grafting
AssigneeWavelight Laser Technologie AG
InventorChristof Donitzky
Life of this patent
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Abstract
A laser system serves for corneal grafting by photodisruptive laser cutting. To this end, short laser pulses within the range from 1 fs to 10 ns are positioned and guided in the cornea in such a way that the foci (20) of the laser pulses describe an incision path in the cornea (12) that exhibits an undercut, so that a seal between the juxtaposed surfaces of the implant and of the residual cornea arises between a donor implant and the recipient cornea which is promoted by the overpressure of the eye
Claims42
A laser system for treatment of the human eye, comprising
- a laser-beam source which emits laser pulses with wavelengths in respect of which the human cornea is transparent and with pulse-lengths within the nanosecond to femtosecond range,
- optical means for controlling the position and the focus (20) of the laser pulses and
- a computer unit which is programmed in such a manner that it controls the optical means in such a way that, in relation to an optical axis of the cornea, the foci describe a path in the interior of the cornea which is guided about the axis and which exhibits in the axial direction at least one zigzag shaped undercut with a sealing surface which corresponds to at least 75% of the area of the optical zone of the cornea.
A method for laser treatment of the human eye, comprising
- providing a laser-beam source which emits laser pulses with wavelengths in respect of which the human cornea is transparent and with pulse-lengths within the nanosecond to femtosecond range, and
- controlling the position and the focus of the laser pulses in such a manner in relation to an optical axis of the cornea, that the foci describe a path in the interior of the cornea which is guided about the axis and which exhibits in the axial direction at least one zigzag shaped undercut with a sealing surface which corresponds to at least 75% of the area of the optical zone of the cornea.
A laser system for treatment of the human eye, comprising
- a laser-beam source which emits laser pulses with wavelengths in respect of which the human cornea is transparent and with pulse-lengths within the nanosecond to femtosecond range,
- optical means for controlling the position and the focus of the laser pulses, and
- a computer unit which is programmed in such a manner that it controls the optical means in such a way that, in relation to an optical axis of the cornea, the foci describe a path in the interior of the cornea which is guided about the axis, by which a central portion of the cornea is completely cut out axially and which exhibits in the axial direction at least one undercut with a sealing surface which corresponds to at least 75% of the area of the optical zone of the cornea.
A method for laser treatment of the human eye, comprising
- providing a laser-beam source which emits laser pulses with wavelengths in respect of which the human cornea is transparent and with pulse-lengths within the nanosecond to femtosecond range, and
- controlling the position and the focus of the laser pulses in such a manner in relation to an optical axis of the cornea that the foci describe a path in the interior of the cornea which is guided about the axis, by which a central portion of the cornea is completely cut out axially and which exhibits in the axial direction at least one undercut with a sealing surface which corresponds to at least 75% of the area of the optical zone of the cornea.
Dependencies are inferred from the claim text.