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    • 1. 发明授权
    • Apparatus and method for performing laser thermal keratoplasty with
minimized regression
    • 用最小化回归进行激光热角膜移植术的装置和方法
    • US6033396A
    • 2000-03-07
    • US744936
    • 1996-11-06
    • David HuangPeter J. McDonnell
    • David HuangPeter J. McDonnell
    • A61F9/007A61F9/01A61N5/02
    • A61F9/008A61F2009/00853A61F2009/00872
    • Noncontact apparatus and method for preforming laser thermal keratoplasty capable of scanning of treatment areas with shapes that reduce regression. The apparatus includes laser sources, a projection optical system, observation system, and control system The projection system uses two steering mirrors to control laser beam position on the cornea. This projection system enables precise control of the area of corneal heat shrinkage using relatively low-powered lasers, such as diode lasers. Desired changes in corneal refractive power are produced by selected patterns of photothermal shrinkage of corneal collagen tissue. The selected patterns are arrangements of oblong shapes that are preferably tapered at the ends of the long axis. The oblong shape and tapering distribute tension in the cornea over a wider area of collagen shrinkage and improve the stability of refractive correction. The long axes of the oblong treatment areas are preferably oriented radially for hyperopia correction and circumferentially for astigmatism correction.
    • 用于预激光热角膜移植术的非接触式装置和方法,其能够扫描具有减少回归的形状的治疗区域。 该装置包括激光源,投影光学系统,观察系统和控制系统。投影系统使用两个转向镜来控制角膜上的激光束位置。 该投影系统能够使用诸如二极管激光器的相对低功率的激光器来精确地控制角膜热收缩的面积。 角膜屈光力的期望变化由角膜胶原组织的光热收缩的选择图案产生。 所选择的图案是长轴形状的布置,其优选在长轴的端部处是锥形的。 椭圆形和锥形分布在角膜的更大面积的胶原收缩中分布张力,并提高屈光矫正的稳定性。 长圆形处理区域的长轴优选径向地进行远视校正,并且周向地用于散光校正。