Methods of transverse placement in ELT
Glaucoma patients suffer from increased intraocular pressure due to blocked fluid flow from the anterior chamber of the eye. Methods of the invention include inserting a probe into an eye of a subject having glaucoma, adjusting placement of the probe to a position transverse to Schlemm's canal in the eye, and applying a plurality of shots from an excimer laser source while the probe is in the transverse position, thereby treating glaucoma by creating a plurality of perforations in Schlemm's canal and/or the trabecular meshwork. By providing a laser probe at a position transverse to Schlemm's canal, energy from the laser is delivered to a greater amount of surface area than if the laser was arranged in a parallel or perpendicular position to Schlemm's canal, resulting in optimal formation of perforations. The perforations allow for drainage of fluid and increased outflow of aqueous humor in the eye.
1. A method of delivering laser energy to a surface of a trabecular meshwork of an eye to treat glaucoma comprising:
inserting a probe into an eye of a subject having glaucoma;
adjusting placement of the probe to a position transverse to Schlemm's canal in the eye; and
creating a plurality of perforations having transverse placement in the trabecular meshwork relative to the Schlemm's canal of the eye by applying a plurality of shots from an excimer laser source, wherein the plurality of perforations are created in the trabecular meshwork in order to treat the glaucoma.
2. The method of claim 1 , wherein a light source aids in adjusting placement of the probe.
3. The method of claim 2 , wherein the light source is a Gonio lens, endoscope, or other illumination source.
4. The method of claim 1 , wherein the plurality of shots comprises 10 shots per eye.
5. The method of claim 1 , wherein the plurality of shots comprises greater than 10 shots per eye.
6. The method of claim 1 , wherein each perforation has a diameter of 200 μm.
7. The method of claim 1 , wherein the probe is inserted into an incision in the eye.
8. The method of claim 7 , wherein the incision has a length of about ⅛ inch or smaller.
9. The method of claim 1 , further comprising administering anesthesia to the subject before inserting the probe.
10. The method of claim 1 , further comprising analyzing effectiveness of the shot by visualizing drainage of aqueous humor and bloody reflux.
11. The method of claim 1 , wherein the probe is a fiber probe.
12. The method of claim 11 , wherein a delivery tip of the fiber probe comprises an optical fiber jacketed in a metal.
13. The method of claim 12 , wherein the metal is stainless steel.
14. The method of claim 12 , wherein the delivery tip is beveled.
15. The method of claim 1 , wherein the excimer laser source comprises a xenon chloride laser.
16. The method of claim 1 , further comprising physically contacting the trabecular meshwork with the probe, wherein the plurality of perforations are created while the probe is physically contacting the trabecular meshwork.
17. The method of claim 1 , wherein at least one of the plurality of perforations creates a fluid path from a front chamber of the eye through the trabecular meshwork to the Schlemm's canal.
18. The method of claim 1 , further comprising removing the probe after the creating of the plurality of perforations.
19. A method of delivering laser energy to a surface of a trabecular meshwork of an eye to treat glaucoma comprising:
inserting a probe into an eye of a subject having glaucoma;
adjusting placement of the probe to a position transverse to Schlemm's canal in the eye;
physically contacting the trabecular meshwork with the probe; and
creating a plurality of perforations having transverse placement in the trabecular meshwork relative to the Schlemm's canal of the eye by applying a plurality of shots from an excimer laser source, wherein the plurality of perforations are created in the trabecular meshwork in order to treat the glaucoma.