The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 26, 2003
Filed:
Oct. 12, 2001
Josef Bille, Heidelberg, DE;
20/10 Perfect Vision Optische Geraete GmbH, Jeidelberg, DE;
Abstract
A device and method for altering the refractive properties of the cornea by photodisrupting stromal lamellae involves focusing a laser beam within the stroma. To effectuate tissue alteration with minimal laser energies, the focal point of the laser beam is maintained inside the stromal lamella, rather than on an interface between layers of lamellae. To maintain the focal point inside the lamella, the bubbles that result from the photodisruption are measured using a wavefront detector. When a large bubble is observed, indicating photodisruption on an interface between layers of lamellae, the depth of the focal point, measured from the anterior surface, is adjusted to thereby resume photodisruption inside a lamella. A wavefront detector can be used to track the progress of the photodisruption procedure, providing information that can be used to update the amounts and locations of stromal tissue that must be removed to obtain the desired refractive correction.