# US 2012/0083776 A1 · Annular and other ablation profiles for refractive surgery systems and methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2012/0083776 A1 - Document ID: US20120083776A1 - Status: Published application - Kind: A1 - Application number: 12/897,946 - Filed: 2010-10-05 - Published: 2012-04-05 - Earliest claimed: 2010-10-05 - Assignees: AMO Development, LLC - Inventors: Guang-ming Dai; Michael Brownell - Web page: https://patentgrep.com/patent/US20120083776A1 ## CPC - A61F 9/00804: {Refractive treatments} - A61F 9/00817: {Beam shaping with masks} - A61F 2009/00872: {Cornea} - 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 Systems, methods, and computer program products are provided for the administration of annular and other ablation profiles during refractive surgery treatments. Basis data framework techniques enable the implementation of both circular and annular ablation profiles resulting in increased ablation efficiency when treating certain vision conditions. In some instances, systems or treatments involve the use of symmetric and asymmetric ablations shapes such as double spots, triple spots, quadruple spots, multiple spots, arc shapes, elliptical shapes, and the like. ## Claims ### Claim 1 A system for ablating optical tissue in an eye of a patient, the system comprising: a laser mechanism that generates multiple laser beam pulses, each laser beam pulse having an original geometry; a mechanical block mechanism that transforms the laser beam pulses, each transformed laser beam pulse having an annular geometry, the mechanical block mechanism having an adjustable iris mechanism and a central block mechanism including one or more obscuration elements that can be positioned along a laser beam path and aligned with the adjustable iris mechanism to define an annular shaped passage; and a delivery mechanism that directs the transformed laser beam pulses toward the eye of the patient so as to ablate the optical tissue, wherein the obscuration element is positionable to block an inner portion of the original geometry laser beam pulse, and an outer portion of the original geometry laser beam pulse transmitted through the annular shaped passage provides the transformed laser beam pulse having the annular geometry. ### Claim 2 (depends on 1) The system according to claim 1, wherein the central block mechanism is configured to rotate about an axis, such that the one or more obscuration elements are independently positionable relative to the adjustable iris mechanism to define the annular shaped passage. ### Claim 3 (depends on 1) The system according to claim 1, wherein the central block mechanism comprises an obscuration blank positionable relative to the adjustable iris mechanism, such that the adjustable iris mechanism in combination with the obscuration blank provides a circular shaped passage for transmission of the laser beam pulses. ### Claim 4 (depends on 1) The system according to claim 1, wherein adjustable iris mechanism is adjustable to an outer diameter selected from the group consisting of 1.0 mm, 1.5 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, 7.5 mm, 8.0 mm, 8.5 mm, 9.0 mm, 9.5 mm, and 10.0 mm. ### Claim 5 (depends on 1) The system according to claim 1, wherein the adjustable iris mechanism is adjustable to an outer diameter within a range from about 1.0 mm to about 10.0 mm. ### Claim 6 (depends on 1) The system according to claim 1, wherein the one or more obscuration elements present a mechanical block inner diameter within a range from about 2.625 mm to about 7.5 mm. ### Claim 7 (depends on 1) The system according to claim 1, wherein the adjustable iris mechanism defines a mechanical block outer diameter and the one or more obscuration elements define a mechanical block inner diameter, such that an obscuration ratio calculated by dividing the inner diameter by the outer diameter is about 0.75. ### Claim 8 A method for ablating optical tissue in an eye of a patient, the method comprising: generating multiple laser beam pulses with a laser, each laser beam pulse having an original geometry; transforming the laser beam pulses with a mechanical block mechanism, each transformed laser beam pulse having an annular geometry; and directing the transformed laser beam pulses toward the eye of the patient so as to ablate the optical tissue. ### Claim 9 (depends on 8) The method according to claim 8, wherein the directing step comprises scanning the transformed laser beam pulses toward the eye in a nondeterministic pattern. ### Claim 10 (depends on 8) The method according to claim 8, wherein the annular geometry is determined based on an optimal obscuration ratio. ### Claim 11 (depends on 8) The method according to claim 8, wherein the transforming step is performed based on an outer dimension of the laser beam pulse. ### Claim 12 (depends on 8) The method according to claim 8, wherein the annular geometry comprises an outer dimension that is determined based on an optical zone of the patient. ### Claim 13 A system for ablating optical tissue in an eye of a patient, the system comprising: a laser mechanism that generates multiple laser beam pulses, each laser beam pulse having an original geometry; a mechanical block mechanism that transforms the laser beam pulses, each transformed laser beam pulse having an annular geometry; and a delivery mechanism that directs the transformed laser beam pulses toward the eye of the patient so as to ablate the optical tissue. ### Claim 14 (depends on 13) The system according to claim 13, wherein the delivery mechanism is configured to scan the transformed laser beam pulses toward the eye in a nondeterministic pattern. ### Claim 15 (depends on 13) The system according to claim 13, wherein the mechanical block mechanism is configured to transform the laser beam pulses to the annular geometry based on an optimal obscuration ratio. ### Claim 16 (depends on 13) The system according to claim 13, wherein the mechanical block mechanism is configured to transform the laser beam pulses to the annular geometry based on an outer dimension of the laser beam pulse. ### Claim 17 (depends on 13) The system according to claim 13, wherein the mechanical block mechanism is configured to transform the laser beam pulses to the annular geometry having an outer dimension that is determined based on an optical zone of the patient. ### Claim 18 (depends on 13) The system according to claim 13, wherein the delivery mechanism is configured to direct the transformed laser beam pulses toward the eye of the patient in a nonconcentric pattern. ### Claim 19 (depends on 13) The system according to claim 13, wherein the mechanical block mechanism comprises an adjustable iris mechanism and a central block mechanism including one or more obscuration elements that can be positioned along a laser beam path and aligned with the adjustable iris mechanism to define an annular shaped passage. ### Claim 20 (depends on 19) The system according to claim 19, wherein the one or more obscuration elements are independently positionable relative to the adjustable iris mechanism to block an inner portion of the original geometry laser beam pulse, and an outer portion of the original geometry laser beam pulse transmitted through the annular shaped passage provides the transformed laser beam pulse having the annular geometry.