Segmented intrastromal corneal insert for altering corneal...

A - Human Necessities – 61 – F

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A61F 2/14 (2006.01)

Patent

CA 2216205

An intrastromal corneal insert for effecting a change in the corneal curvature to treat conditions such as astigmatism myopia, and hyperopia. The insert includes one or more arcuate or arc-shaped segments. The extent of corneal correction by such a segment, for a given cross-sectional configuration, is a function of one or more predefined parameters, including the arc angle, radius of curvature, cone angle, modulus of elasticity, and thickness of the segment. The invention also provides for various methods for changing the refractive characteristics of an eye. Generally, the methods involve determining the amount of corrective refraction desired, providing an intrastromal channel which traverses at least a portion of the circumcorneal rotation, and introducing one or more of the inventive segmented inserts.

Implant cornéen intrastromal servant à modifier la courbure de la cornée pour traiter, entre autres, l'astigmatisme, la myopie et l'hypermétropie. L'implant comprend un ou plusieurs segments arqués. L'étendue de la correction cornéenne par un tel segment, pour une configuration de coupe transversale donnée, est fonction d'un ou de plusieurs paramètres prédéfinis, y compris l'angle de l'arc, le rayon de la courbure, l'angle du cône, le module d'élasticité et l'épaisseur du segment. L'invention prévoit également différentes méthodes pour modifier les caractéristiques de réfraction de l'oeil. Généralement, les méthodes servent à déterminer la quantité souhaitée de réfraction à corriger, à créer un canal intrastromal qui traverse au moins une partie de la rotation péricornéene et à introduire un ou plusieurs des implants segmentés de l'invention.

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