LASER EYE SURGERY LENS FRAGMENTATION

• US 20160106588A1
• Filed: 10/16/2015
• Published: 04/21/2016
• Est. Priority Date: 10/31/2013
• Status: Active Grant

• Current Assignee: AMO Development LLC (Johnson & Johnson)
• Original Assignee: OptiMedica Corporation (Johnson & Johnson)
• Inventors: Srinivasan, Rajeshwari, Gonzalez, Javier G., Kramme, Erik C.
• Granted Patent: US 10,327,953 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 3/102 for optical coherence tomography [OCT]
• CPC Class Codes: A61F 2009/00851 Optical coherence topography [OCT]
• CPC Class Codes: A61F 2009/00853 Laser thermal keratoplasty or radial keratotomy
• CPC Class Codes: A61F 2009/00855 Calibration of the laser system
• CPC Class Codes: A61F 2009/0087 Lens
• CPC Class Codes: A61F 2009/00872 Cornea
• CPC Class Codes: A61F 2009/00882 based on topography
• CPC Class Codes: A61F 2009/00887 Cataract
• CPC Class Codes: A61F 9/00804 Refractive treatments
• CPC Class Codes: A61F 9/00825 for photodisruption
• CPC Class Codes: A61F 9/00827 Refractive correction, e.g. lenticle
• CPC Class Codes: A61F 9/0084 Laser features or special beam parameters therefor

Abstract

A laser eye surgery system includes a laser to generate a laser beam. A spatial measurement system generates a measurement beam and measure a spatial disposition of an eye. A processor is coupled to the laser and the spatial measurement system, the processor comprising a tangible medium embodying instructions to determine a spatial model of the eye in an eye coordinate reference system based on the measurement beam. The spatial model is mapped from the eye coordinate reference system to a machine coordinate reference system. A laser fragmentation pattern is determined based on a plurality of laser fragmentation parameters. The laser fragmentation pattern and the spatial model is rotated by a first rotation angle such that the spatial model is aligned with the reference axis of the machine coordinate reference system and the rotated laser fragmentation pattern is aligned with the corneal incision.

Claims

1. A laser eye surgery system, comprising:

a laser to generate a laser beam;

a spatial measurement system to generate a measurement beam and measure a spatial disposition of an eye;

a processor coupled to the laser and the spatial measurement system, the processor comprising a tangible medium embodying instructions to;

determine a spatial model of the eye in an eye coordinate reference system based on the measurement beam;

map the spatial model from the eye coordinate reference system to a machine coordinate reference system;

receive a rotation angle of a corneal incision relative to a reference axis of the machine coordinate reference system;

determine a laser fragmentation pattern based on a plurality of laser fragmentation parameters;

determine a first rotation angle based on the rotation angle of the corneal incision and a rotation angle of the laser fragmentation pattern relative to the reference axis of the machine coordinate reference system;

rotate the spatial model by a negative of the first rotation angle; and

rotate the laser fragmentation pattern and the spatial model by the first rotation angle such that the spatial model is aligned with the reference axis of the machine coordinate reference system and the rotated laser fragmentation pattern is aligned with the corneal incision.

2. The laser system of claim 1, wherein the laser fragmentation pattern defines a first lens portion to be first extracted that is aligned opposite the corneal incision.

3. The laser system of claim 1, wherein the laser fragmentation pattern is asymmetrical.

4. The laser system of claim 1, wherein the lens fragmentation pattern includes a first portion and a second portion having at least one of a different segmentation pattern and softening pattern.

5. The laser system of claim 1, wherein the lens fragmentation pattern includes a first unsoftened portion and a second softened portion.

6. The laser system of claim 1, wherein the lens fragmentation pattern includes a first portion defining two octants and a second portion defining three quadrants.

7. The laser system of claim 1, wherein the lens fragmentation pattern includes a first portion defining two unsoftened octants and a second portion defining three softened quadrants.

8. The laser system of claim 1, wherein the laser beam is generated based on the rotated laser fragmentation pattern.

9. The laser system of claim 1, wherein the first rotation angle is based on user input.

10. A method of generating a lens fragmentation pattern, comprising:

determining a spatial model of the eye in an eye coordinate reference system based on the measurement beam;

mapping the spatial model from the eye coordinate reference system to a machine coordinate reference system;

receiving a rotation angle of a corneal incision relative to a reference axis of the machine coordinate reference system;

determining a laser fragmentation pattern based on a plurality of laser fragmentation parameters;

determining a first rotation angle based on the rotation angle of the corneal incision and a rotation angle of the laser fragmentation pattern relative to the reference axis of the machine coordinate reference system;

rotating the spatial model by a negative of the first rotation angle;

rotating the laser fragmentation pattern and the spatial model by the first rotation angle such that the spatial model is aligned with the reference axis of the machine coordinate reference system and the rotated laser fragmentation pattern is aligned with the corneal incision; and

generating a laser beam by a laser source based on the laser fragmentation pattern.

11. The method of claim 10, wherein the laser fragmentation pattern defines a first lens portion to be extracted first that is aligned opposite the corneal incision.

12. The method of claim 10, wherein the laser fragmentation pattern is asymmetrical.

13. The method of claim 10, wherein the lens fragmentation pattern includes a first portion and a second portion having at least one of a different segmentation pattern and softening pattern.

14. The method of claim 10, wherein the lens fragmentation pattern includes a first unsoftened portion and a second softened portion.

15. The method of claim 10, wherein the lens fragmentation pattern includes a first portion defining two octants and a second portion defining three quadrants.

16. The method of claim 10, wherein the lens fragmentation pattern includes a first portion defining two unsoftened octants and a second portion defining three softened quadrants.

17. The method of claim 10, wherein the first rotation angle is based on user input.

18. A method of treating an object with a laser beam, comprising:

measuring a plurality of characteristics of the object by an object sensor;

determining a model of the object based on the measured characteristics;

receiving a rotation angle of an incision relative to a reference coordinate space;

generating a laser fragmentation pattern for treating the object;

rotating the laser fragmentation pattern by the received rotation angle relative to the reference coordinate space; and

applying a laser beam by a laser source based on the rotated laser fragmentation pattern to the object.

19. The method of claim 18, wherein the model is aligned with the reference coordinate space and the laser fragmentation pattern is aligned with the incision.

20. A method of generating a lens fragmentation pattern, comprising:

measuring a plurality of characteristics of an eye by a laser surgery system;

determining a spherical model of the eye;

determining lens segmentation boundaries based on the spherical model;

receiving a rotation angle of a corneal incision relative to a reference coordinate space;

generating a laser fragmentation pattern for the eye;

rotating the laser fragmentation pattern relative to the received rotation angle; and

applying a laser beam based on the rotated laser fragmentation pattern on the eye.