Intraocular implants and methods and kits therefor
Devices, methods and kits are described for reducing intraocular pressure. The devices include a support that is implantable within Schlemm's canal and maintains the patency of the canal without substantially interfering with transmural fluid flow across the canal. The devices utilize the natural drainage process of the eye and can be implanted with minimal trauma to the eye. Kits include a support and an introducer for implanting the support within Schlemm's canal. Methods include implanting a support within Schlemm's canal, wherein the support is capable of maintaining the patency of the canal without substantial interference with transmural fluid flow across the canal.
1. A method for reducing intraocular pressure in a patient using a support and an introducer comprising a cannula, comprising:
positioning a distal end of the cannula at or near Schlemm's canal, wherein the support is located in a lumen of the cannula; and
pushing the support distally out of the distal end of the cannula to insert the support circumferentially within Schlemm's canal,
wherein the support comprises an arcuate member, wherein at least a portion of the arcuate member has a radius of curvature R supp smaller than the radius of curvature of Schlemm's canal such that at least a portion of the arcuate member extends out of Schlemm's canal.
2. The method of claim 1 , wherein the patient has glaucoma.
3. The method of claim 1 , further comprising anchoring the support to tissue surrounding Schlemm's canal.
4. The method of claim 1 , further comprising dilating Schlemm's canal prior to inserting the support.
5. The method of claim 4 , wherein Schlemm's canal is dilated by injecting fluid into the canal.
6. The method of claim 1 , wherein the support at least partially props open Schlemm's canal.
7. The method of claim 1 , wherein the support does not significantly block fluid outflow to the collector channels after insertion into Schlemm's canal.
8. The method of claim 1 , wherein the support does not significantly block fluid outflow from the trabecular meshwork after insertion into Schlemm's canal.
9. The method of claim 1 , wherein R supp is about 10% smaller than the radius of curvature of Schlemm's canal.
10. The method of claim 1 , wherein R supp is about 20% smaller than the radius of curvature of Schlemm's canal.
11. The method of claim 1 , wherein R supp is about 30% smaller than the radius of curvature of Schlemm's canal.
12. The method of claim 1 , wherein R supp is about 40% smaller than the radius of curvature of Schlemm's canal.
13. The method of claim 1 , wherein R supp is about 50% smaller than the radius of curvature of Schlemm's canal.
14. The method of claim 1 , wherein R supp is about 3 mm.
15. The method of claim 1 , wherein R supp is about 4 mm.
16. The method of claim 1 , wherein R supp is about 5 mm.
17. The method of claim 1 , wherein the support extends less than a quarter of the way around Schlemm's canal after insertion into the canal.
18. The method of claim 1 , wherein the support extends about one quarter of the way around Schlemm's canal after insertion into the canal.
19. The method of claim 1 , wherein the support extends about one half of the way around Schlemm's canal after insertion into the canal.
20. The method of claim 1 , wherein the support extends about all the way around Schlemm's canal after insertion into the canal.
21. The method of claim 1 , wherein when the support is inserted within a cylindrical section of the lumen of Schlemm's canal having an internal wall surface area C, the support contacts less than 30% of the surface area of C.
22. The method of claim 1 , wherein the support comprises at least one fenestration.
23. The method of claim 1 , wherein the support comprises a plurality of fenestrations.
24. The method of claim 1 , wherein the support is non-tubular.
25. The method of claim 1 , wherein the support comprises a shape memory alloy.
26. The method of claim 1 , wherein the support has a first shape prior to insertion within Schlemm's canal and a second shape after insertion.
27. The method of claim 1 , wherein the support has a sinusoidal shape.