Thermokeratoplasty systems
The present invention provides applicators for performing thermokeratoplasty. One embodiment of such applicators includes a pair of electrical conducting elements electrically separated by a selected distance and extending from a proximal end to a distal end. The electrical conducting elements define, at the distal end, a contact surface that is positionable at a cornea. At least one of the electrical conducting elements is divided into a plurality of discrete sections extending from the proximal end to the distal end. The discrete sections are selectively and separately actuated by a controller according to one or more variable characteristics to deliver energy to the cornea.
1. An applicator for providing eye therapy, comprising:
a pair of electrical conducting elements electrically separated by a selected distance and extending from a proximal end to a distal end along an axis, the electrical conducting elements defining, at the distal end, a contact surface that is positionable at a cornea, at least one of the electrical conducting elements being divided into a plurality of discrete sections extending from the proximal end to the distal end; and
a controller configured to selectively and separately actuate the discrete sections according to one or more variable characteristics to deliver energy to the cornea.
2. The applicator of claim 1 , wherein the sections include longitudinally coextensive members separated from electrical contact with one another.
3. The applicator of claim 1 , wherein at least one of the electrical conducting elements is divided in quartile sections of coaxial extension.
4. The applicator of claim 1 , wherein the sections are separated by a dielectric material.
5. The applicator of claim 1 , wherein the one or more variable characteristics includes at least one of intensity, duty cycle, waveform, frequency, and duration.
6. The applicator of claim 1 , further comprising one or more sensors positioned to measure the one or more variable characteristics and providing feedback signals to the controller.
7. The applicator of claim 6 , wherein the one or more variable characteristics including at least one of corneal elongation, corneal compression, corneal displacement, corneal velocity, corneal acceleration, local slope, local curvature, global slope, global curvature, corneal stress, and corneal pressure.
8. The applicator of claim 1 , wherein at least two of the sections are actuated to have different levels of the one or more variable characteristics.
9. The applicator of claim 1 , wherein the sections are actuated in unison.
10. The applicator of claim 1 , further comprising a cooling system that cools the applicator.
11. The applicator of claim 1 , further comprising a vacuum positioning system.
12. The applicator of claim 1 , wherein the one or more characteristics provide modalities corresponding to a variety of diopter adjustments.
13. The applicator of claim 1 , wherein the one or more characteristics provide treatment of astigmatism.
14. The applicator of claim 1 , wherein the electrical conducting elements are concentric.
15. The applicator of claim 14 , wherein at least one of the electrical conducting elements is a tube having, in a cross-section perpendicular to the axis, an annular shape.
16. The applicator of claim 1 , wherein the sections are longitudinally coextensive, separated from electrical contact with one another, and have, in a cross-section perpendicular to the axis, a shape equal to a sector of an annulus.
17. The applicator of claim 16 , wherein the sections are N in number, and the sector having a central angle of 180 degrees divided by N.