Method for generating an ablation program, method for ablating a body and means for carrying out said method

Patent metadata

Field	Value
Publication number	US-2016346118-A1
Application number	US-201615166354-A
Country	US
Kind code	A1
Filing date	May 27, 2016
Priority date	Feb 15, 2005
Publication date	Dec 1, 2016
Grant date	—

Abstract

In a method for generating an ablation program for ablation of material from a surface of a body according to a predetermined desired ablation profile by emission of pulses of a pulsed laser beam onto the surface, the ablation program is generated from the desired ablation profile as a function of the shape of a beam profile of the laser beam and of an inclination of the surface to be ablated and/or considering a water content of the material to be ablated.

First claim

1 . A method for generating an ablation program for ablation of material from a surface of a body according to a predetermined desired ablation profile by emission of pulses of a pulsed laser beam onto the surface, the method comprising:
generating the ablation program from the predetermined desired ablation profile as a function of the shape of a beam profile of the laser beam and as a function of an inclination of the surface to be ablated; using the predetermined desired ablation profile to determine a pre-compensated desired ablation profile as a function of a refractive index of the material at a respective target location of the surface; and generating the ablation program on a basis of the pre-compensated desired ablation program.

2 . The method as claimed in claim 1 , further comprising, in order to consider the inclination of the surface and the shape of the beam profile, using the predetermined desired ablation profile to determine the pre-compensated desired ablation profile as a function of at least one of a shape of the beam profile and the inclination of the surface at the respective target location on the surface; and
generating the ablation program on the basis of the pre-compensated desired ablation program.

3 . The method as claimed in claim 2 , further comprising, for at least two regions to be ablated from the surface, respectively determining one value of a modification function as a function of at least one of the shape of the beam profile and the inclination of the surface in the respective region and determining the pre-compensated desired ablation profile using the predetermined desired ablation profile and the values of the modification function.

4 . The method as claimed in claim 3 , wherein the modification function additionally depends on the intensity, the energy, or the fluence of the pulses to be used for ablation.

5 . The method as claimed in claim 1 , further comprising determining a preliminary ablation program from the predetermined desired ablation profile, for at least one of the pulses to be emitted and determining a desired value for energy or fluence of the at least one pulse depending on the shape of the beam profile, on the inclination of the surface at the region onto which the at least one pulse is to be emitted, and on a prediction of ablation depth using the preliminary ablation program, and wherein the generated ablation program comprises the target location of the pulse according to the preliminary ablation program and the determined value for the energy or fluence of the pulse.

6 . The method as claimed in claim 1 , further comprising determining the a preliminary ablation program from the predetermined desired ablation profile, using the preliminary ablation program to predict a predicted ablation profile as a function of the beam profile shape and of the inclination of the surface, and generating the ablation program to be used using the predicted ablation profile.

7 . The method as claimed in claim 6 , further comprising determining the predicted ablation profile at at least two locations which are spaced apart from each other by less than a diameter of the laser beam on the surface of the body.

8 . The method as claimed in claim 6 , further comprising using the predicted ablation profile and the predetermined desired ablation profile to determine the pre-compensated desired ablation profile, and wherein the ablation program to be used is generated from the pre-compensated desired ablation profile.

9 . The method as claimed in claim 6 , further comprising generating the ablation program to be used in an iterative manner in that, in an actual iteration step, a preliminary ablation program is determined from a modified desired ablation profile determined in a preceding iteration step, an actual predicted ablation profile is predicted on the basis of the preliminary ablation program as a function of the beam profile shape and of the inclination of the surface, an actual modified desired ablation profile is determined using the actual predicted ablation profile, and the ablation program to be used is generated as a function of the predetermined desired ablation profile and at least one of the modified desired ablation profiles after a last iteration loop.

10 . The method as claimed in claim 1 , further comprising using a model to predict the course of the ablation depth for a pulse as a function of the shape of the beam profile.

11 . The method as claimed in claim 1 , wherein the material contains water, the method further comprising guiding the laser beam over the surface during the ablation to be effected, and generating the ablation program starting from the predetermined desired ablation profile, and additionally considering a water content of the material to be ablated.

12 . A method for ablation of material from a surface of a body according to a predetermined desired ablation profile by application of a pulsed laser beam, which is guided over the surface and has a beam profile with a predetermined shape; comprising, wherein an ablation program is generated by a method for generating an ablation program for ablation, and pulses of the laser beam are directed onto the surface according to the generated ablation program, the method comprising:
generating the ablation program from the predetermined desired ablation profile as a function of the shape of a beam profile of the laser beam and as a function of an inclination of the surface to be ablated; using the predetermined desired ablation profile to determine a pre-compensated desired ablation profile as a function of a refractive index of the material at a respective target location of the surface; and generating the ablation program on a basis of the pre-compensated desired ablation program.

13 . The method as claimed in claim 12 , further comprising, for at least two pulses determining the energy or fluence of said pulses during ablation as a function of the shape of the beam profile and of the inclination of the surface in the region onto which the respective pulse is emitted.

14 . A device for generating an ablation program for ablation of material from a surface according to a predetermined desired ablation profile by emission of pulses of a pulsed laser beam onto the surface, said device comprising:
a data processing device which is configured to carry out a generating method for generating an ablation program, the generating method comprising: generating the ablation program from the predetermined desired ablation profile as a function of the shape of a beam profile of the laser beam and a function of an inclination of the surface to be ablated; and using the predetermined desired ablation profile to determine a pre-compensated desired ablation profile as a function of a refractive index of the material at a respective target location of the surface, and generating the ablation program on a basis of the pre-compensated desired ablation program.

15 . The device as claimed in claim 14 , wherein the data processing device comprises an interface configured for input of data which characterize the shape of the beam profile of the laser beam.

16 . The device as claimed in claim 14 , further comprising a device for acquisition of topographical data of the surface to be ablated.

17 . A device for ablation of material from a surface of a body, said device comprising:
a laser that emits a pulsed laser beam, a deflecting device for controlled deflection of the laser beam, and a generating device, said generating device comprising a data processing device which is con

Assignees

• Zeiss Carl Meditec Ag

Inventors

• Sluyterman Van Langeweyde Georg
• Cabeza-Guillén Jesús-Miguel

Classifications

• B23K26/032

  using optical means · CPC title

• A61F2009/00882

  based on topography · CPC title

• A61F9/008 Primary

  using laser · CPC title

• B23K2203/32

  Operations & Transport · mapped topic

• A61F2009/00872

  Cornea · CPC title