US 12,303,433 B2
Ophthalmological device for refractive correction of a cornea
Christian Rathjen, Bremen (DE); and Michael Steinlechner, Zurich (CH)
Assigned to Ziemer Ophthalmic Systems AG, Port (CH)
Filed by Ziemer Ophthalmic Systems AG, Port (CH)
Filed on Apr. 12, 2022, as Appl. No. 17/718,637.
Claims priority of application No. 00407/21 (CH), filed on Apr. 19, 2021.
Prior Publication US 2022/0331163 A1, Oct. 20, 2022
Int. Cl. A61F 9/008 (2006.01); A61F 9/009 (2006.01)
CPC A61F 9/00804 (2013.01) [A61F 9/00814 (2013.01); A61F 9/009 (2013.01); A61F 2009/00872 (2013.01); A61F 2009/00897 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An ophthalmological device for refractive correction of a cornea of an eye by generating a three-dimensional void volume inside the cornea, the ophthalmological device comprising:
a laser source configured to generate a pulsed laser beam;
a focusing optical module configured to make the pulsed laser beam converge onto a focal spot in the cornea;
a scanner system configured to move the focal spot to target locations in the cornea; and
an electronic circuit configured to control the scanner system to move the focal spot inside the cornea to generate an ablated first part of the void volume by ablating cornea tissue, without extracting the corneal tissue, with a thickness of more than one focal spot in direction of any of the three dimensions inside the first part of the void volume, to generate a separated second part of the void volume by separating the second part of the void volume as piece of cornea tissue to be removed from the void volume through an incision in the cornea, and to include in the first part of the void volume any area of the void volume, planned for a desired refractive correction, which has a thickness smaller than a defined thinness threshold, with respect to a distance between an anterior volume surface and a posterior volume surface,
wherein the piece of cornea tissue is shaped by ablating the first part and at least a part of the separated second part is separated from the cornea by the ablated first part.