| CPC A61F 9/00827 (2013.01) [A61F 9/00836 (2013.01); A61B 2018/20353 (2017.05); A61B 2018/20355 (2017.05); A61F 2009/00872 (2013.01); A61F 2009/00897 (2013.01)] | 20 Claims |
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1. An ophthalmic surgical laser system comprising:
a laser source configured to generate a pulsed laser beam comprising a plurality of laser pulses;
a laser delivery system configured to deliver the pulsed laser beam to a target tissue in a subject's eye;
a high frequency scanner configured to scan the pulsed laser beam back and forth at a predefined frequency;
an XY-scanner configured to deflect the pulsed laser beam, the XY-scanner being separate from the high frequency scanner;
a Z-scanner configured to modify a depth of a focus of the pulsed laser beam; and
a controller configured to control the laser source, the high frequency scanner, the XY-scanner and the Z-scanner to successively form a plurality of sweeps which collectively form at least one lenticular incision of a lens in the subject's eye, the lens having a curved surface that defines an apex and a Z axis passing through the apex, wherein each sweep is formed by:
controlling the laser source to generate the pulsed laser beam having a pulse energy of 40 nJ to 70 nJ;
controlling the high frequency scanner to deflect the pulsed laser beam to form a scan line, the scan line being a straight line having a predefined length and being tangential to a parallel of latitude of the lens, the parallel of latitude being a circle on the surface of the lens that is perpendicular to the Z axis and has a defined distance to the apex, and
controlling the XY-scanner and the Z-scanner to move the scan line along a meridian of longitude of the lens, the meridian of longitude being a curve that passes through the apex and has a defined angular position around the Z axis, wherein the scan line is moved at a sweeping speed that produces a scan line step of between 1.7 μm and 2.3 μm, the scan line step being a distance between a center of consecutive scan lines;
wherein the plurality of sweeps are successively formed one after another along the respective meridians of longitude which are different from one another.
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10. A method for creating a lenticular incision using an ophthalmic surgical laser system, the method comprising the steps of:
generating, by a laser source, a pulsed laser beam comprising a plurality of laser pulses;
delivering, by a laser delivery system, the pulsed laser beam to a target tissue in a subject's eye;
scanning, by a high frequency scanner, the pulsed laser beam back and forth at a predefined frequency;
deflecting, by an XY-scanner, the pulsed laser beam, the XY-scanner being separate from the high frequency scanner;
modifying, by a Z-scanner, a depth of a focus of the pulsed laser beam; and
controlling, by a controller, the laser source, the high frequency scanner, the XY-scanner and the Z-scanner to successively form a plurality of sweeps which collectively form at least one lenticular incision of a lens in the subject's eye, the lens having a curved surface that defines an apex and a Z axis passing through the apex, including forming each sweep by:
controlling the laser source to generate the pulsed laser beam having a pulse energy of 40 nJ to 70 nJ;
controlling the high frequency scanner to deflect the pulsed laser beam to form a scan line, the scan line being a straight line having a predefined length and being tangential to a parallel of latitude of the lens, the parallel of latitude being a circle on the surface of the lens that is perpendicular to the Z axis and has a defined distance to the apex, and
controlling the XY-scanner and the Z-scanner to move the scan line along a meridian of longitude of the lens, the meridian of longitude being a curve that passes through the apex and has a defined angular position around the Z axis, wherein the scan line is moved at a sweeping speed that produces a scan line step of between 1.7 μm and 2.3 μm, the scan line step being a distance between a center of consecutive scan lines;
wherein the plurality of sweeps are successively formed one after another along the respective meridians of longitude which are different from one another.
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19. An ophthalmic surgical laser system comprising:
a laser source configured to generate a pulsed laser beam comprising a plurality of laser pulses;
a laser delivery system configured to deliver the pulsed laser beam to a target tissue in a subject's eye;
a high frequency scanner configured to scan the pulsed laser beam back and forth at a predefined frequency;
an XY-scanner configured to deflect the pulsed laser beam, the XY-scanner being separate from the high frequency scanner;
a Z-scanner configured to modify a depth of a focus of the pulsed laser beam; and
a controller configured to control the laser source, the high frequency scanner, the XY-scanner and the Z-scanner to successively form a plurality of sweeps which collectively form a bed cut in the target tissue, wherein each sweep is formed by:
controlling the laser source to generate the pulsed laser beam having a pulse energy of 40 nJ to 70 nJ;
controlling the high frequency scanner to deflect the pulsed laser beam to form a scan line, the scan line being a straight line having a predefined length, and
controlling the XY-scanner to move the scan line along a predetermined direction, wherein the scan line is moved at a sweeping speed that produces a scan line step of between 1.7 μm and 2.3 μm, the scan line step being a distance between a center of consecutive scan lines.
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