# US 10,369,052 B2 · Systems and methods for lenticular laser incision

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- Number: US 10,369,052 B2
- Document ID: US10369052B2
- Status: Granted
- Kind: B2
- Application number: 14/865,396
- Filed: 2015-09-25
- Published: 2016-03-31
- Granted: 2019-08-06
- Earliest claimed: 2014-09-25
- Assignees: AMO Development, LLC
- Applicants: AMO Development, LLC
- Inventors: Hong Fu
- Web page: https://patentgrep.com/patent/US10369052B2

## CPC

- A61F 9/00825: {for photodisruption}
- A61F 9/00827: {Refractive correction, e.g. lenticle}
- A61F 9/00834: {Inlays; Onlays; Intraocular lenses [IOL]}
- A61F 9/0084: {Laser features or special beam parameters therefor}
- A61F 9/00829: {Correction of higher orders}
- A61F 2009/00844: {Feedback systems}
- A61F 2009/0087: {Lens}
- A61F 2009/00872: {Cornea}
- A61F 2009/00887: {Cataract}
- A61F 2009/00897: {Scanning mechanisms or algorithms}
- 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

Embodiments of this invention generally relate to ophthalmic laser procedures and, more particularly, to systems and methods for lenticular laser incision. In an embodiment, an ophthalmic surgical laser system comprises a laser delivery system for delivering a pulsed laser beam to a target in a subject's eye, an XY-scan device to deflect the pulsed laser beam, a Z-scan device to modify a depth of a focus of the pulsed laser beam, and a controller configured to form a top lenticular incision and a bottom lenticular incision of a lens in the subject's eye.

## Claims

### Claim 1

An ophthalmic surgical laser system comprising:
a laser delivery system for delivering a focus of a pulsed laser beam to a target in a subject's eye;
a high frequency scanner to scan the focus of the pulsed laser beam back and forth parallel to an XY plane at a predefined frequency;
an XY-scanner to deflect the focus of the pulsed laser beam parallel to the XY plane, the XY-scanner being different from the high frequency scanner;
a Z-scanner to modify a depth of the focus of the pulsed laser beam, the depth being in a Z direction perpendicular to the XY plane; and
a controller configured to control the high frequency scanner, the XY-scanner and the Z-scanner to successively form a plurality of sweeps which collectively form at least one lenticular incision of a lens in the subject's eye, the lens having a curved surface that defines an apex and a Z axis passing through the apex, wherein each sweep is formed by: controlling the high frequency scanner to deflect the pulsed laser beam back and forth to form a scan line, the scan line being a straight line having a predefined length and being parallel to the XY plane and tangential to a parallel of latitude of the lens, the parallel of latitude being a circle on the surface of the lens that is perpendicular to the Z axis and has a defined distance to the apex, while controlling the XY-scanner and the Z-scanner to move the scan line along a meridian of longitude of the lens, the meridian of longitude being a curve that passes through the apex and has a defined angular position around the Z axis, wherein the plurality of sweeps are successively formed one after another along the respective meridians of longitude which are different from one another.

### Claim 2 (depends on 1)

The ophthalmic surgical laser system of claim 1, wherein the high frequency scanner is a resonant scanner.

### Claim 3 (depends on 1)

The ophthalmic surgical laser system of claim 1, wherein the at least one lenticular incision includes a top lenticular incision and a bottom lenticular incision, wherein the curved surface is a top surface of the lens corresponding to the top lenticular incision, the lens further including a bottom surface corresponding to the bottom lenticular incision and defining another apex, and wherein the scan line for each of the sweeps forming the top lenticular incision is moved over the top surface of the lens through the apex of the top surface of the lens, and the scan line for each of the sweeps forming the bottom lenticular incision is moved over the bottom surface of the lens through the other apex of the bottom surface of the lens.

### Claim 4 (depends on 1)

The ophthalmic surgical laser system of claim 1, wherein there is a deviation between an end point of the scan line and a point on the surface of the lens which is a spherical surface.

### Claim 5 (depends on 4)

The ophthalmic surgical laser system of claim 4, wherein the deviation is determined by
δ
=
R
2
+
L
2
4
-
R
≈
L
2
8
⁢
R
,
where R is a radius of curvature of the spherical surface of the lens, and L is the length of the scan line.

### Claim 6 (depends on 4)

The ophthalmic surgical laser system of claim 4, wherein a depth of a focus of the pulsed laser beam is calculated based on a radius of curvature of the spherical surface of the lens.

### Claim 7 (depends on 1)

The ophthalmic surgical laser system of claim 1, further comprising a prism disposed to receive scanned pulsed laser beam from the high frequency scanner, and wherein the controller is configured to rotate the prism to rotate an orientation of the scan line between successive sweeps.

### Claim 8

A method for creating a lenticular incision using an ophthalmic surgical laser system, the method comprising the steps of:
generating a pulsed laser beam;
delivering a focus of the pulsed laser beam to a target in a subject's eye;
scanning, by a high frequency scanner, the focus of the pulsed laser beam back and forth parallel to an XY plane at a predefined frequency;
deflecting, by an XY-scanner, the focus of the pulsed laser beam parallel to the XY plane, the XY-scanner being different from the high frequency scanner;
modifying, by a Z-scanner, a depth of the focus of the pulsed laser beam, the depth being in a Z direction perpendicular to the XY plane; and
controlling, by a controller, the high frequency scanner, the XY-scanner and the Z-scanner to successively form a plurality of sweeps which collectively form at least one lenticular incision of a lens in the subject's eye, the lens having a curved surface that defines an apex and a Z axis passing through the apex, including forming each sweep by: controlling the high frequency scanner to deflect the pulsed laser beam back and forth to form a scan line, the scan line being a straight line having a predefined length and being parallel to the XY plane and tangential to a parallel of latitude of the lens, the parallel of latitude being a circle on the surface of the lens that is perpendicular to the Z axis and has a defined distance to the apex, while controlling the XY-scanner and the Z-scanner to move the scan line along a meridian of longitude of the lens, the meridian of longitude being a curve that passes through the apex and has a defined angular position around the Z axis, wherein the plurality of sweeps are successively formed one after another along the respective meridians of longitude which are different from one another.

### Claim 9 (depends on 8)

The method of claim 8, wherein the high frequency scanner is a resonant scanner.

### Claim 10 (depends on 8)

The method of claim 8, wherein the at least one lenticular incision includes a top lenticular incision and a bottom lenticular incision, wherein the curved surface is a top surface of the lens corresponding to the top lenticular incision, the lens further including a bottom surface corresponding to the bottom lenticular incision and defining another apex, and wherein the scan line for each of the sweeps forming the top lenticular incision is moved over the top surface of the lens through the apex of the top surface of the lens, and the scan line for each of the sweeps forming the bottom lenticular incision is moved over the bottom surface of the lens through the other apex of the bottom surface of the lens.

### Claim 11 (depends on 8)

The method of claim 8, wherein there is a deviation between an end point of the scan line and a point on the surface of the lens which is a spherical surface.

### Claim 12 (depends on 11)

The method of claim 11, wherein the deviation is determined by
δ
=
R
2
+
L
2
4
-
R
≈
L
2
8
⁢
R
,
where R is a radius of curvature of the spherical surface of the lens, and L is the length of the scan line.

### Claim 13 (depends on 12)

The method of claim 12, wherein a depth of a focus of the pulsed laser beam is calculated based on a radius of curvature of the spherical surface of the lens.

### Claim 14 (depends on 8)

The method of claim 8, further comprising: controlling, by the controller, a rotation of a prism which is disposed to receive scanned pulsed laser beam from the high frequency scanner to rotate an orientation of the scan line between successive sweeps.