Device and process for surgery on the human eye

Patent metadata

Field	Value
Publication number	US-9974691-B2
Application number	US-201114345378-A
Country	US
Kind code	B2
Filing date	Oct 10, 2011
Priority date	Oct 10, 2011
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

A laser apparatus is controlled by a control program that operates to use laser radiation to generate an incision figure in the cornea of an eye, the incision figure including an incision that bounds a corneal tissue volume. The control program operates to move the radiation focus in a radiation propagation direction successively in a plurality of superposed planes such that the radiation focus is moved without motion control in the propagation direction. The control program provides, for each plane, for a meandering scan path of the radiation focus that extends outside the tissue volume. The control program operates to allow through to the eye, in each plane, at least such radiation pulses that generate the first incision and to blank, in at least a fraction of the planes, at least a fraction of radiation pulses assigned to regions of the path that are at a distance from the incision.

First claim

The invention claimed is:

1. Device for surgery on the human eye, the device comprising:
a laser apparatus for providing pulsed focused laser radiation, the laser apparatus being controlled by a control program in such a manner that by application of the laser radiation it generates an incision figure in the cornea of an eye to be treated, the incision figure including a first incision that defines a 3-dimensional corneal tissue volume to be removed,
wherein the generation of the first incision requires a motion control of the radiation focus in the direction of propagation of the radiation,
wherein the control program is designed in such a manner that for the generation of the incision figure the radiation focus is moved successively in a plurality of superposed planes in which a movement of the radiation focus is possible in each instance without motion control in the direction of propagation of the radiation,
wherein for each plane the control program provides for a meandering scan path of the radiation focus that, at least in a region of its reversing-points of the meandering scan path, extends outside the tissue volume,
wherein the control program allows through to the eye, in each plane, at least such radiation pulses which serve for generating the first incision, wherein the control program blanks, in at least a partial number of the planes, those radiation pulses which are assigned to regions of the meandering scan path that are situated at a distance from the first incision.

2. Device according to claim 1 , wherein the control program allows through to the eye in at least a partial number of the planes, only such radiation pulses which serve for generating the first incision.

3. Device according to claim 1 , wherein the incision figure includes at least one further incision that subdivides the tissue volume bounded by the first incision into partial volumes that are separate from one another, wherein the control program allows through to the eye, in the planes, at least such radiation pulses which serve for generating the at least one further incision.

4. Device according to claim 3 , wherein the at least one further incision includes at least one second incision that severs the tissue volume along one of the planes.

5. Device according to claim 4 , wherein the control program, in a plane for which the incision figure provides a second incision, blanks all those radiation pulses which are assigned to regions of the meandering scan path that lie outside the tissue volume.

6. Device according to claim 4 , wherein the at least one further incision includes several second incisions that are superposed in each instance at a mutual distance of several planes.

7. Device according to claim 3 , wherein the at least one further incision includes at least one third incision that extends transversely to the planes.

8. Device according to claim 1 , wherein the control program sweeps the planes with the radiation focus in the order of their superposed arrangement, and only after complete sweeping of the meandering scan path of one plane to move the radiation focus to a next plane.

Assignees

• Donitzky Christof
• Vogler Klaus
• Wavelight Gmbh

Inventors

• Donitzky Christof
• Vogler Klaus

Classifications

• A61F9/00827 Primary

  Refractive correction, e.g. lenticle · CPC title

• A61F2009/00897

  Scanning mechanisms or algorithms · CPC title

• A61F2009/00872

  Cornea · CPC title

• A61F9/008 Primary

  using laser · CPC title