US 2024/0197532 A1Published application

Lasik corneal flap cutting patterns for bubble management

AssigneeAMO Development, LLC

InventorsAndrew Voorhees, Hong Fu, James Hill, Mohammad Saidur Rahaman, Wenzhi Gao, Brian Schwam, Paul Gray, Cynthia Villanueva, Deepali Mehta-Hurt, Jesse Nelson, Michal Laron

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Abstract

A method implemented in an ophthalmic surgical laser system that employs a resonant scanner, scan line rotator, and XY- and Z-scanners, for forming a corneal flap in a patient's eye with improved bubble management during each step of the flap creation process. A pocket cut is formed first below bed level, followed by the bed connected to the pocket cut, then by a side cut extending from the bed to the anterior corneal surface. The pocket cut includes a pocket region located below the bed level and a ramp region connecting the pocket region to the bed. The bed is formed by a bed cut, including multiple overlapping parallel raster scan passes, and a ring cut. The side cut is formed by multiple side-cut layers at different depths which are joined together. All cuts are formed by scanning a laser scan line generated by the resonant scanner.

Claims20

Dependent claims

A method implemented in an ophthalmic surgical laser system for incising a cornea of a patient's eye to form a corneal flap, the method comprising:

controlling a laser delivery system of the ophthalmic surgical laser system to deliver a pulsed laser beam to the cornea;
controlling a high frequency scanner of the ophthalmic surgical laser system to scan the pulsed laser beam back and forth to form a laser scan line;
and
controlling a scan line rotator, an XY-scanner and a Z-scanner of the ophthalmic surgical laser system to move the laser scan line in the cornea to form the corneal flap, including forming a bed of the flap and forming a side cut of the flap,
wherein the bed is located in a horizontal plane at a first depth from an anterior corneal surface, the bed defining a hinge line, wherein the side cut extends from the bed upwards to the anterior corneal surface to form a side of the flap, the side cut surrounding an entire periphery of the bed except the hinge line, and
wherein forming the bed of the flap consists of:
forming a bed cut by scanning the laser scan line in successive overlapping parallel raster scan passes;
and
forming a single ring cut along a periphery of the bed except for an area of the hinge cut by scanning the laser scan line along a circumference of the bed, wherein the ring cut covers all areas of the bed not covered by the bed cut.

6 more elements

An ophthalmic surgical laser system, comprising:

a laser delivery system configured to deliver a pulsed laser beam to a cornea of a patient's eye;
a high frequency scanner configured to scan the pulsed laser beam back and forth at a predefined frequency to form a laser scan line;
a scan line rotator configured to rotate an orientation of the laser scan line;
an XY-scanner and a Z-scanner configured to move the laser scan line in lateral and depth directions;
and
a controller operatively coupled to and programmed to control the scan line rotator, the XY-scanner and the Z-scanner to scan the laser scan line in the cornea to form a corneal flap, including to form a bed of the flap and to form a side cut of the flap,
wherein the bed is located in a horizontal plane at a first depth from an anterior corneal surface, the bed defining a hinge line, wherein the side cut extends from the bed upwards to the anterior corneal surface to form a side of the flap, the side cut surrounding an entire periphery of the bed except the hinge line, and
wherein the bed of the flap consist of a bed cut formed by scanning the laser scan line in successive overlapping parallel raster scan passes, and a single ring cut along a periphery of the bed except for an area of the hinge cut formed by scanning the laser scan line along a circumference of the bed, wherein the ring cut covers all areas of the bed not covered by the bed cut.

5 more elements

Dependencies are inferred from the claim text.