Operator-controlled scanning laser procedure designed for large-area epithelium removal
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United States of America Patent
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Apr 26, 2011
Grant Date -
May 29, 2008
app pub date -
Nov 9, 2007
filing date -
Nov 10, 2006
priority date (Note) -
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Abstract
Systems and methods for removing an epithelial layer disposed over a stromal layer in a cornea irradiate a region of the epithelial layer with a pulsed beam of ablative radiation. The ablative radiation is scanned to vary the location of the beam within the region in accordance with a pulse sequence. The pulse sequence is arranged to enhance optical feedback based on a tissue fluorescence of the epithelial layer. The penetration of the epithelial layer is detected in response to the optical feedback. The use of scanning with the pulse sequence arranged to enhance optical feedback allows large areas of the epithelium to be ablated such that an operator can detect penetration of the epithelial layer.
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