# US 2014/0155873 A1 · Automatic centration of a surgical pattern on the apex of a curved patient interface

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- Number: US 2014/0155873 A1
- Document ID: US20140155873A1
- Status: Published application
- Kind: A1
- Application number: 14/090,292
- Filed: 2013-11-26
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: AMO Development, LLC
- Applicants: AMO Development, LLC.
- Inventors: Zsolt Bor
- Web page: https://patentgrep.com/patent/US20140155873A1

## CPC

- A61F 9/00825: {for photodisruption}
- A61F 9/009: Auxiliary devices making contact with the eyeball and coupling in laser light, {e.g. goniolenses (apparatus for eye examination A61B3/0008)}
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

An apparatus to treat a patient comprises a laser beam, a measurement module, a scanner and a curved patient interface lens. The curved patient interface is measured with a pattern so as to determine a plurality of distances of the curved surface at a plurality of measurement locations. The measurement pattern may comprise the plurality of measurement locations distributed about a central measurement axis corresponding to the laser treatment axis. The plurality of measurement locations of the curved surface may correspond to a portion of a planned treatment profile, such that the measured distances correspond to alignment of the planned treatment. The plurality of distances can be used to determine an apex of the curved surface of the patient interface and to align the laser treatment axis with the apex of the curved surface.

## Claims

### Claim 1

An apparatus to treat an eye having a cornea, the apparatus comprising:
a laser source to generate a laser beam to treat the eye;
an optically transmissive interface to couple to the cornea of the patient, the optically transmissive interface having a curved surface to contact an anterior surface of the cornea;
an optical delivery system to deliver the laser beam to the eye;
a measurement module coupled to the optical delivery system to measure the curved surface; and
a processor comprising computer readable instructions, the processor coupled to the optical delivery system and the laser source to treat the cornea with a treatment profile, the computer readable medium comprising instructions to measure a plurality of distances of the curved surface at a plurality of locations and to align the treatment profile with the curved surface based on the plurality of distances.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the computer readable medium comprises instructions to adjust a location of the treatment profile based on differences among the plurality of distances.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein the computer readable memory comprises instructions to decenter the treatment profile a central treatment axis to decrease the angle.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein the computer readable memory comprises instructions to define a central treatment axis of the optical delivery system based on the plurality of distances.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein the computer readable memory comprises instructions to move a central location of the treatment profile toward an apex of the curved surface based on the plurality of distances.

### Claim 6 (depends on 1)

The apparatus of claim 1, wherein the computer readable medium comprises instructions to determine a tilt angle of the curved surface at the plurality of locations and to adjust a center position of a laser treatment beam based on the tilt angle.

### Claim 7 (depends on 6)

The apparatus of claim 6, wherein the plurality of locations comprises a central location and the curved surface comprises an apex and wherein the tilt angle comprises a tilt angle of the central location and wherein the center position is adjusted toward the apex based on the tilt angle of the central location.

### Claim 8

A method of treating a patient having a cornea, the method comprising:
providing an optically transmissive interface to couple to the cornea of the patient, the optically transmissive interface having a curved surface to contact an anterior surface of the cornea;
measuring a plurality of distances of the curved surface at a plurality of locations with a light beam;
adjusting a location of the treatment profile based on differences among the plurality of distances to align the treatment profile with the curved surface.

### Claim 9 (depends on 8)

The method of claim 8, wherein adjusting comprises decentering the treatment profile or a central treatment axis to decrease the angle.

### Claim 10 (depends on 8)

The method of claim 8, wherein a central location of the treatment profile comprising a central treatment axis is moved toward an apex of the curved surface based on the plurality of distances.

### Claim 11 (depends on 8)

The method of claim 8, further comprising determining a tilt angle of the curved surface at the plurality of locations and adjusting a central treatment axis of a laser treatment beam based on the tilt angle.

### Claim 12 (depends on 11)

The method of claim 11, wherein the plurality of locations defines a central location along a measurement axis and the curved surface comprises an apex and wherein the tilt angle comprises a tilt angle of the central location and wherein the measurement axis is adjusted toward the apex based on the tilt angle.

### Claim 13 (depends on 8)

The method of claim 8, further comprising determining an elevation difference among the plurality of distances and wherein a location of the treatment profile is adjusted based on the elevation difference to decrease the elevation difference and align the treatment profile with the curved surface.

### Claim 14 (depends on 13)

The method of claim 13, further comprising determining an angle of the curved surface based on the elevation difference and wherein the location of the treatment profile is adjusted based on the angle to decrease the elevation difference.

### Claim 15 (depends on 14)

The method of claim 14, wherein the plurality of locations are positioned about a central measurement axis and wherein the central measurement axis is offset from a first location to a second location to decrease the angle.

### Claim 16 (depends on 8)

The method of claim 8, wherein the plurality of distances at the plurality of locations corresponds to a portion of a treatment profile of the cornea.

### Claim 17 (depends on 8)

The method of claim 8, wherein the treatment profile comprises an outer boundary and wherein the plurality of locations of the treatment profile correspond to pulses at the outer boundary of the treatment profile in order to align the outer boundary of the treatment profile with the curved surface.

### Claim 18 (depends on 8)

The method of claim 8, wherein the plurality of locations of the curved surface corresponds to a plurality of locations of pulses of the treatment profile within an epithelial layer of the cornea.

### Claim 19 (depends on 8)

The method of claim 8, wherein the light beam comprises a laser beam, the laser beam comprising a treatment beam having a second energy per pulse and a measurement beam having a first energy per pulse, the first energy per pulse less than the second energy per pulse and less than a threshold of optical breakdown.

### Claim 20 (depends on 8)

The method of claim 8, wherein the light beam comprises one or more of infrared light, ultraviolet light, or visible light.