Ophthalmological laser system

Patent metadata

Field	Value
Publication number	US-10292867-B2
Application number	US-201815912755-A
Country	US
Kind code	B2
Filing date	Mar 6, 2018
Priority date	Mar 12, 2009
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

An ophthalmological laser system for photodisruptive irradiation of ocular tissue, including a crystalline lens or a cornea. The system includes an ultra-short pulse laser, the radiation of which is focusable as illumination light via an illumination beam path including a scanner unit and focusing optics. A control unit is programmed to execute determining irradiation control data for photodisruptions at irradiation points in an interior of the ocular tissue distributed three-dimensionally and non-equidistantly to create at least one predetermined target incision. The laser system then irradiates the ocular tissue according to the determined irradiation control data.

First claim

The invention claimed is:

1. An ophthalmological laser system for photodisruptive irradiation of ocular tissue, the ocular tissues including a crystalline lens or a cornea, the ophthalmological laser system comprising:
an ultra-short pulse laser, the ultra-short pulse laser emitting radiation which is focusable as illumination light via an illumination beam path in an examination region including at least one of the crystalline lens and the cornea, the illumination beam path including a scanner unit and focusing optics;
a control unit programmed to execute the following:
determining irradiation control data for photodisruptions at a plurality of irradiation points in the interior of the ocular tissue to create at least one predetermined target incision, wherein the irradiation points are arranged regularly and in such a way that a compensation of a refractive deficit results in the light passing through the ocular tissue; and
controlling a laser to irradiate the ocular tissue according to the determined irradiation control data.

2. The ophthalmological laser system for photodisruptive irradiation of ocular tissue, according to claim 1 , wherein the control unit is further programmed to execute the following:
further determining irradiation control data for the photodisruptions at the plurality of the irradiation points in the interior of the ocular tissue to create at least one predetermined target incision in such a way that different spatial expansions result for at least some of the photodisruptions to be produced; and
controlling the laser to irradiate the ocular tissue according to the determined irradiation control data.

3. The ophthalmological laser system for photodisruptive irradiation of ocular tissue, according to claim 2 , wherein the control unit is further programmed to execute the following:
distributing the different spatial expansions statistically.

4. The ophthalmological laser system for photodisruptive irradiation of ocular tissue, according to claim 1 , wherein the control unit is further programmed to execute the following: determining at least one property of the ocular tissue before the determination of irradiation control data and taking the at least one property into account for the determination of the irradiation control data and/or for a correction of the irradiation control data.

5. The ophthalmological laser system for photodisruptive irradiation of ocular tissue, according to claim 1 , wherein the control unit is further programmed to execute the following: taking into account an efficiency of the photodisruptive irradiation, position-dependent with regard to the ocular tissue for the determination of the irradiation control data and/or a correction of the irradiation control data.

6. The ophthalmological laser system for photodisruptive irradiation of ocular tissue, according to claim 1 , further comprising a pulse picker located before or after a laser amplification arrangement; and
wherein the control unit is further programmed to execute the following: producing a non-equidistant arrangement of the irradiation points through spatially non-equidistant control signals by control of operation of the pulse picker.

7. The ophthalmological laser system for photodisruptive irradiation of ocular tissue, according to claim 1 , wherein the control unit is further programmed to execute the following:
arranging the irradiation points to form a Fresnel lens.

8. The ophthalmological laser system for photodisruptive irradiation of ocular tissue, according to claim 1 , wherein the control unit is further programmed to execute the following:
arranging the irradiation points to form a Fresnel step lens or a Fresnel lens zone lens.

9. The ophthalmological laser system for photodisruptive irradiation of ocular tissue, according to claim 8 , wherein the control unit is further programmed to execute the following:
forming a primary irradiation target in addition to the Fresnel step lens or the Fresnel lens zone lens.

10. The ophthalmological laser system for photodisruptive irradiation of ocular tissue, according to claim 1 , further comprising an arrangement for confocal detection of radiation from the examination region.

11. The ophthalmological laser system for photodisruptive irradiation of ocular tissue, according to claim 1 , wherein the control unit is further programmed to execute the following:
determining irradiation control data for photodisruptions at a plurality of irradiation points in the interior of the ocular tissue to create at least one predetermined target incision in such a way that different spatial expansions result for at least some of the photodisruptions to be produced;
producing different spatial expansions through a variation of a pulse energy between the respective irradiation points, through arranging of a varying number of irradiation points for overlapping the resulting photodisruptions or both of the foregoing; and
irradiating the ocular tissue according to the determined irradiation control data.

12. The ophthalmological laser system for photodisruptive irradiation of ocular tissue, according to claim 1 , wherein the control unit is further programmed to execute the following:
determining at least one property of the ocular tissue before the determination of the irradiation control data and taking the at least one property into account for the determination of the irradiation control data, for correction of the irradiation control data or both of the foregoing.

13. The ophthalmological laser system for photodisruptive irradiation of ocular tissue, according to claim 1 ,
wherein efficiency of the photodisruptive irradiation is position-dependent with regard to the ocular tissue; and
wherein the control unit is further programmed to execute the following:
taking into account the efficiency of the photodisruptive irradiation in the determination of the irradiation control data, correction of the irradiation control data or both of the foregoing.

Assignees

• Zeiss Carl Meditec Ag

Inventors

• Dick Manfred
• Reich Matthias
• Grebner Dieter

Classifications

• A61F9/008

  using laser · CPC title

• A61F2009/00872

  Cornea · CPC title

• A61F9/00838 Primary

  Correction of presbyopia · CPC title

• A61F2009/0087

  Lens · CPC title

• A61F2009/00897

  Scanning mechanisms or algorithms · CPC title