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Device for laser-surgical ophthalmology

An ophthalmic laser and equipment technology, applied in laser surgery, ophthalmic surgery, laser welding equipment, etc., can solve unreachable problems and achieve highly reproducible results

Active Publication Date: 2012-05-16
ALCON INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for lens cutting, using the same principle as the repositioning of the z focus when using a femtosecond laser that repeats in the double- or triple-digit kHz range or even higher, at least 10 mm / s and above is necessary. Input lens repositioning speed, which is not achievable using linear drive systems currently available on the market, at least not when using such systems that meet the requirements regarding adjustment accuracy

Method used

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  • Device for laser-surgical ophthalmology
  • Device for laser-surgical ophthalmology
  • Device for laser-surgical ophthalmology

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Embodiment Construction

[0022] First refer to figure 1 . Therein, the cornea indicated by 10 in a human eye is shown in partial representation. The optical axis (optical axis) of the eye is drawn in dotted line and indicated by 12 . Cornea 10 presents an anterior surface 14 and a posterior surface 16 . In a typical human eye, its thickness d lies in the range of about 500 [mu]m, although variations up or down from person to person are of course possible. The sclera and limbus of the eye are in figure 1 Indicated at 18, the edge of the limbus at 20.

[0023] In addition, in figure 1 Depicted in dotted lines in is the intracorneal tissue, more precisely the intrastromal lens body 22 to be ablated by treatment with focused femtosecond laser radiation, which is then surgically operated through the opening to be introduced into the cornea 10. method is cut. The opening can likewise be produced by means of laser cutting. Femto-lens extraction allows correction of vision defects such as myopia and myo...

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Abstract

The invention relates to a device for laser-surgical ophthalmology comprising a source (28) for a pulsed femtosecond laser beam, a telescope (32) expanding the laser beam, a scanner (36) connected downstream of the telescope for deflecting the laser beam in a plane that is perpendicular to the beam path, and an F-theta lens system (44) connected downstream of the scanner for focusing the laser beam. According to the invention, an entrance lens (52) of the telescope (32) is designed as a controllable lens having variable refractive power. The entrance lens (52) is preferably formed by an electrically controllable liquid lens or liquid crystal lens.

Description

technical field [0001] The present invention relates to equipment for ophthalmic laser surgery. In particular, the invention relates to a device for laser surgery that allows the focal point of the laser beam it supplies to be shifted rapidly in the z-direction, the expression "z-direction" referring, according to traditional notation, to the direction of the beam path (the direction). Therefore, any direction in a plane orthogonal to the z direction can be understood as the x-y direction. In order to scan the area of ​​the eye to be treated with the laser beam, the laser beam is deflected in this plane in a conventional manner by means of a scanner. Background technique [0002] In ophthalmic surgery, laser systems that emit short pulses of radiation in the femtosecond range are used, especially for internal tissue ablation in the cornea and human lens. In this context, the effect used is optical breakthrough, which leads to so-called photodisruption of the irradiated ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F9/01B23K26/08G02B26/10G02B3/14
CPCB23K26/0807B23K26/0027A61F9/00827B23K26/4035A61F2009/00872
Inventor 克劳斯·沃格勒克劳迪娅·格舍博特
Owner ALCON INC
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