Laser beam ophthalmological surgery method and apparatus

• US 5,480,396 A
• Filed: 12/09/1994
• Issued: 01/02/1996
• Est. Priority Date: 12/09/1994
• Status: Expired due to Fees

• Current Assignee: Cheng-Hao Huang, Gabriel Simon
• Original Assignee: Cheng-Hao Huang, Gabriel Simon
• Inventors: Huang, Cheng-Hao, Simon, Gabriel
• Primary Examiner(s): Pellegrino, Stephen C.
• Assistant Examiner(s): HARRIS, SONYA C
• Application Number:
  US08/352,357
• Time in Patent Office: 389 Days
• Field of Search: 606/4, 606/5, 606/6, 606/10, 606/11, 606/12, 128/898
• US Class Current: 606/4
• CPC Class Codes: A61B 2017/00199 with a console, e.g. a control panel with a display
• CPC Class Codes: A61B 2018/20351 Scanning mechanisms
• CPC Class Codes: A61B 2018/20355 Special scanning path or conditions, e.g. spiral, raster or providing spot overlap
• CPC Class Codes: A61B 2018/20359 by movable mirrors, e.g. galvanometric
• CPC Class Codes: A61B 2018/208 with multiple treatment beams not sharing a common path, e.g. non-axial or parallel
• CPC Class Codes: A61F 2009/00844 Feedback systems
• CPC Class Codes: A61F 2009/00872 Cornea
• CPC Class Codes: A61F 2009/00897 Scanning mechanisms or algorithms
• CPC Class Codes: A61F 9/008 using laser
• CPC Class Codes: A61F 9/00804 Refractive treatments

Abstract

A laser beam ophthalmological surgery method includes the steps of generating a laser beam and splitting the generated laser beam into multiple laser beams which are simultaneously focused onto a plurality of scanners. Each scanner in turn produces a predetermined scanning pattern focused on the cornea of a patient'"'"'s eye to ablate the cornea tissue and with at least two beams simultaneously scanning and ablating the cornea tissue. Scanning is controlled from a central processing unit to perform the surgical procedure, removing a laser thickness of the cornea tissue to provide a safer and more predictable surgical procedure in the reshaping of the cornea. A laser ophthalmological surgery apparatus is provided which includes a laser generating a laser beam, a beam splitter for splitting the laser beam into a plurality of laser beams, and a plurality of scanners, each positioned for receiving one of the laser beams from the beam splitter and producing a predetermined scanning pattern from the laser beam and impinging the scanning pattern upon the cornea of a patient'"'"'s eye.

Claims

1. A laser beam ophthalmological surgery method for ablating a portion of a cornea comprising the steps of:

generating a laser beam;

splitting the generated laser beam into a plurality of laser beams;

focusing each of said plurality of laser beams onto a scanner;

scanning each of said plurality of laser beams in a predetermined scanning pattern for ablation of the cornea of a patient'"'"'s eye;

directing said plurality of scanning laser beams parallel to each other directly onto the surface of the cornea of an eye of a patient with said plurality of scanning beams scanning a generally superimposed parallel pattern to each other; and

controlling each said scanner from a central processing unit to thereby surgically reshape the cornea of the eye.

2. A laser beam ophthalmological surgery method in accordance with claim 1 in which the step of scanning a plurality of laser beams includes scanning each of two laser beams, each laser beam being out of phase with the other laser beam.

3. A laser beam ophthalmological surgery method in accordance with claim 2 in which the step of splitting the generated laser beam into a plurality of laser beams includes splitting the laser beam into two laser beams and impinging each laser beam onto a separate scanner.

4. A laser beam ophthalmological surgery method in accordance with claim 3 in which each scanning laser beam is scanning a generally parallel and spaced beam from the other laser beam with each parallel beam forming a superimposing pattern with a second parallel beam.

5. A laser beam ophthalmological surgery method in accordance with claim 4 in which the step of controlling said scanning includes controlling two scanners with the same central processing unit.

6. A laser beam ophthalmological surgery method in accordance with claim 5 in which the step of generating a laser beam includes generating a laser beam having a ultra-violet wavelength between 193 nm and 215 nm.

7. A laser beam ophthalmological surgery method in accordance with claim 6 in which the step of generating a laser beam includes generating a laser beam from an excimer laser having a wavelength of 193 nm.

8. A laser beam ophthalmological surgery method in accordance with claim 5 in which the step of scanning each of said laser beam includes scanning each laser beam with a pair of galvanometer scanners.

9. A laser beam ophthalmological surgery method in accordance with claim 8 in which the step of scanning each of said pair of scanning beams includes scanning each of said laser beams of the two beams in a plurality of generally straight lines, each parallel to the other and each beam traveling in an opposite direction from the other.

10. A laser beam ophthalmological surgery method in accordance with claim 9 in which the step of scanning a pair of laser beams includes scanning each of said laser beams of the two laser beams parallel to each other in a generally circular beam pattern around the central portion of the cornea.

11. A laser ophthalmological surgery apparatus for ablating a portion of a cornea comprising:

a laser for generating a laser beam;

a beam splitter for splitting the laser beam from said laser into a plurality of laser beams;

a plurality of scanners, each positioned for receiving one of said laser beams from said beam splitter and producing a predetermined scanning pattern from the laser beam impinging thereupon;

focusing optics positioned between said laser and said beam splitter for focusing each of said laser beams onto one said scanner;

directing means positioned between said plurality of scanners and said cornea for directing each of said laser beams onto the cornea of a patient'"'"'s eye simultaneously in a parallel pattern for ablating a portion of the cornea of the eye; and

a computer connected to each said scanner for controlling each said scanner in a predetermined pattern whereby a plurality of laser beams can perform a surgical procedure on a patient'"'"'s eye.

12. A laser beam ophthalmological surgery apparatus in accordance with claim 11 in which said beam splitter produces a plurality of out of phase laser beams.

13. A laser beam ophthalmological surgery apparatus in accordance with claim 12 in which said beam splitter splits the generated laser beam into two out of phase laser beams and each laser beam impinged onto a separate beam scanner.

14. A laser beam ophthalmological surgery apparatus in accordance with claim 13 in which said directing means directs each scanning laser beam generally parallel and spaced from each other onto a patient'"'"'s eye.

15. A laser beam ophthalmological surgery apparatus in accordance with claim 14 in which said computer controls each of said beam scanners simultaneously.

16. A laser beam ophthalmological surgery apparatus in accordance with claim 15 in which said laser generates a laser beam having an ultra-violet wavelength between 193 nm and 215 nm.

17. A laser beam ophthalmological surgery apparatus in accordance with claim 16 in which said laser is an eximer laser having a wavelength of 193 nm.

18. A laser beam ophthalmological surgery apparatus in accordance with claim 17 in which each said scanner is a galvanometer scanner having a mirror mounted to galvanometer.