IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
UP-0682976
(2007-03-07)
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등록번호 |
US-7717906
(2010-06-10)
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발명자
/ 주소 |
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출원인 / 주소 |
- Technolas Perfect Vision GmbH
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
12 |
초록
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A system and method for performing ophthalmic surgery requires splitting a laser beam into a pattern having a plurality of focal points. The pattern is then moved along a spiral path according to a predetermined, two-phase protocol. In the first phase, a radial spacing “Δr” betwe
A system and method for performing ophthalmic surgery requires splitting a laser beam into a pattern having a plurality of focal points. The pattern is then moved along a spiral path according to a predetermined, two-phase protocol. In the first phase, a radial spacing “Δr” between spiral lines, and the velocity of the pattern “rω” are held constant as the radius “r” is decreased from r1 to r2. In the second phase the angular velocity “ω” is held constant and the radial spacing “Δr” is proportionally increased as “r” is further decreased from r2 to r3. Additional LIOB is required both inside r3, as r is reduced to zero and, then, along the periphery of the treatment area for a rim cut at r1.
대표청구항
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What is claimed is: 1. A system for performing ophthalmic laser surgery which comprises: a source means for generating a pulsed laser beam; an optical means for focusing the laser beam into a pattern having a plurality of focal points; an optical scanner means for moving the pattern of focal points
What is claimed is: 1. A system for performing ophthalmic laser surgery which comprises: a source means for generating a pulsed laser beam; an optical means for focusing the laser beam into a pattern having a plurality of focal points; an optical scanner means for moving the pattern of focal points along a spiral path, wherein movement of the pattern relative to a central axis is characterized by a variable angular velocity “ω”, and a variable radius “r”; and a computer means, connected to the optical scanner means, for controlling the pattern in a first phase wherein a radial spacing “Δr” between spiral lines, and the product “rω”, are held substantially constant as “r” is decreased from a radius r1 to a radius r2, and for controlling the pattern in a second phase wherein “ω” is held constant and the radial spacing “Δr” is proportionally increased as “r” is further decreased from the radius r2 to a radius r3. 2. A system as recited in claim 1 wherein the optical means includes a beam splitter, wherein r1 is approximately 4.5 millimeters, wherein r2 is approximately 0.85 millimeters and wherein r3 is approximately 0.5 millimeters. 3. A system as recited in claim 2 wherein the beam splitter is connected to the computer for synchronized rotation of the beam splitter with the movement of the pattern at the angular velocity ω. 4. A system as recited in claim 2 wherein the beam splitter is a “1 to 3” beam splitter. 5. A system as recited in claim 4 wherein the laser beam has an energy of approximately 4.5 μJ, and the energy at each focal point is approximately 1.5 μJ. 6. A system as recited in claim 5 wherein each focal point in the pattern has a separation from an adjacent focal point of approximately 20 μm. 7. A system as recited in claim 6 wherein each pulse of the pulsed laser beam has a duration less than one picosecond, and wherein a pulse is fired approximately every 25 μsec, and further wherein the pattern is moved through a distance of approximately 30 μm between each pulse. 8. A system as recited in claim 2 wherein the first phase is characterized by changing ω from ω1=38 Hz to ω2=200 Hz, as r is correspondingly changed from r1=approximately 4.5 mm to r2=approximately 0.85 mm (r1ω1=r2ω2=constant). 9. A system as recited in claim 8 wherein the second phase is characterized by a constant ω (ω2=200 Hz), and a proportional change in the radial spacing Δr, from Δr=6 μm at r2, to Δr=10 μm at r=r3. 10. A system as recited in claim 9 wherein the computer moves the pattern in a third phase characterized by a constant ω (ω=200 Hz) and a constant Δr (Δr=10 μm) as r changes from r=r3 to r=0. 11. A system as recited in claim 9 wherein the computer moves the pattern in a third phase along a linear path characterized by a plurality of substantially parallel lines when r<r3. 12. A system as recited in claim 11 further comprising a clear window, wherein the beam splitter is replaced by the clear window during creation of a rim cut at r1=approximately 4.5 mm. 13. A system as recited in claim 9 wherein the rotating beam splitter is removed during the third phase and the laser beam is moved with a single focal point. 14. A system for performing ophthalmic laser surgery which comprises: a source for generating a pulsed laser beam; a means for splitting the laser beam into a pattern having a plurality of focal points; an optical means for moving the pattern along a path in accordance with a predetermined protocol wherein the path is a spiral path and movement of the pattern relative to a central axis is characterized by a variable angular velocity “ω”,and a variable radius “r”; and where in the protocol includes: a first phase wherein a radial spacing “Δr” between spiral lines, and the product “rω”, are held substantially constant as “r” is decreased from a radius r1 of approximately 4.5 millimeters to a radius r2 of approximately 0.85 millimeters, and a second phase wherein “ω” is held constant and the radial spacing “Δr” is proportionally increased as “r” is further decreased from the radius r2 of approximately 0.85 millimeters to a radius r3 of approximately 0.5 millimeters; and a computer means for synchronizing a movement of the beam splitting means with the movement of the pattern along a predetermined portion of the path. 15. A system as recited in claim 14 wherein the protocol further includes a third phase characterized by a constant angular velocity ω, and a constant radial spacing Δr, as r changes from r =r3 to r =0, and a rim cut where r =approximately 4.5 mm. 16. A system as recited in claim 14 wherein the protocol further includes a third phase characterized by movement of the pattern along a linear path having a plurality of substantially parallel lines when r<r3, and a rim cut where r=approximately 4.5 mm. 17. A method for performing ophthalmic laser surgery which comprises the steps of: generating a pulsed laser beam, wherein the laser beam has an energy of approximately 4.5 μJ and each pulse has a duration less than one picosecond, and wherein a pulse is fired approximately every 25 μsec; splitting each pulse of the laser beam into a pattern having a plurality of focal points, with the energy at each focal point being approximately 1.5 μJ and with each focal point in the pattern having a separation from an adjacent focal point of approximately 20 μm; moving the pattern of focal points along a spiral path, wherein movement of the pattern relative to a central axis is characterized by a variable angular velocity “ω”, and a variable radius “r”, and wherein the pattern is moved through a distance of approximately 30 μm between each pulse; and synchronizing the splitting step and the moving step to follow a protocol having a first phase wherein a radial spacing “Δr” between spiral lines, and the product “rω”, are held substantially constant as “r” is decreased from a radius r1 of approximately 4.5 millimeters to a radius r2 of approximately 0.85 millimeters, and having a second phase wherein “ω” is held constant and the radial spacing “Δr” is proportionally increased as “r” is further decreased from the radius r2 of approximately 0.85 millimeters to a radius r3 of approximately 0.5 millimeters. 18. A method as recited in claim 17 further comprising the step of including a third phase into the protocol wherein the third phase is characterized by a constant angular velocity ω, and a constant radial spacing Δr, as r changes from r=r3 to r=0, and a rim cut where r=approximately 4.5 mm. 19. A method as recited in claim 17 further comprising the step of including a third phase into the protocol wherein the third phase is characterized by movement of the pattern along a linear path having a plurality of substantially parallel lines when r<r3, and a rim cut where r=approximately 4.5 mm.
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