US 11,865,042 B2
Methods and systems for laser ophthalmic surgery that provide for iris exposures below a predetermined exposure limit
Georg Schuele, Portola Valley, CA (US); David A. Dewey, Santa Ana, CA (US); Javier G. Gonzalez, Palo Alto, CA (US); and Alexander Vankov, Mountain View, CA (US)
Assigned to AMO Development, LLC, Irvine, CA (US)
Filed by AMO Development, LLC, Irvine, CA (US)
Filed on Apr. 1, 2021, as Appl. No. 17/220,877.
Application 17/220,877 is a division of application No. 15/885,616, filed on Jan. 31, 2018, granted, now 10,973,683.
Claims priority of provisional application 62/452,911, filed on Jan. 31, 2017.
Prior Publication US 2021/0220170 A1, Jul. 22, 2021
Int. Cl. A61F 9/008 (2006.01); A61B 3/14 (2006.01); A61B 34/00 (2016.01); A61B 34/10 (2016.01); A61B 18/00 (2006.01); A61B 90/00 (2016.01); A61B 17/00 (2006.01)
CPC A61F 9/008 (2013.01) [A61B 3/14 (2013.01); A61B 34/25 (2016.02); A61F 9/00825 (2013.01); A61B 2017/00154 (2013.01); A61B 2018/00601 (2013.01); A61B 2034/104 (2016.02); A61B 2090/0409 (2016.02); A61B 2090/049 (2016.02); A61F 2009/00853 (2013.01); A61F 2009/00872 (2013.01); A61F 2009/00878 (2013.01); A61F 2009/00887 (2013.01); A61F 2009/00897 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A laser surgical method for performing a corneal incision in an eye of a patient while maintaining iris exposure below a predetermined exposure limit, the method comprising:
generating a simulated initial treatment scan pattern of a pulsed laser treatment beam corresponding to a predetermined corneal incision in the eye;
calculating an initial exposure level, which is an amount of laser energy per unit area of the pulsed laser treatment beam on an iris tissue of the eye caused by the initial treatment scan pattern;
determining whether the initial exposure level satisfies a predetermined safe exposure condition which is below an exposure that causes a minimal visible lesion in the iris tissue;
generating a simulated revised treatment scan pattern of the pulsed laser treatment beam for incising the corneal tissue which is different from the initial treatment scan pattern and which comprises one or more treatment scan modifying elements when the initial indication of exposure level fails to satisfy the predetermined safe exposure condition, wherein the one or more treatment scan modifying elements cause a calculated revised exposure level, which is an amount of laser energy per unit area of the pulsed laser treatment beam on the iris tissue caused by the revised treatment scan pattern, to satisfy the predetermined safe exposure condition,
wherein the one or more treatment modifying elements comprises: (1) an extension of a scan path of the scan pattern so that a portion of each turnaround of the scan path occurs beyond an incision boundary, the extension of the scan path being greater than 50% of a turnaround distance of the scan path, or (2) an extension of the scan path of the scan pattern so that a portion of each turnaround of the scan path is gated and extends beyond the incision boundary, the extension of the scan path being greater than 50% of a turnaround distance of the scan path, or (3) a reoriented scan axis, wherein the reoriented axis is reoriented along an axis corresponding to a largest distance between opposing incision boundaries, or (4) a plurality of gated rows of a scan path inserted among active rows of the scan path in a fixed proportion, the fixed proportion being greater than or equal to one, and less than or equal to 10; and
scanning a focal zone of the pulsed laser treatment beam according to the revised treatment scan pattern, thereby performing the corneal incision.