Uveoscleral shunt and methods for implanting same
Devices and methods for treating intraocular pressure are disclosed. The devices include shunts for draining aqueous humor from the anterior chamber to the uveoscleral outflow pathway, including the supraciliary space and the suprachoroidal space. The shunts are preferably implanted by ab interno procedures.
1. A system for treating an ocular disorder, comprising:
a shunt formed from polyimide, the shunt comprising:
a lumen extending through the shunt;
one or more outlet openings located on a body of the shunt and communicating with the lumen;
a flange along a proximal portion of the shunt; and
radial extensions located on an exterior surface of the shunt to resist extrusion of the shunt from the supraciliary or suprachoroidal space, the radial extensions formed by at least three radial grooves;
wherein the shunt has a length between 2 mm and 7 mm, and
wherein the shunt is generally rigid such that the shunt generally maintains its preformed shape when implanted;
a delivery instrument to deliver the shunt, the delivery instrument comprising a body with an open distal end and a plurality of members being at least partially disposed within the body and being longitudinally moveable relative to each other to aid in delivery of the shunt, the delivery instrument comprising a spring to actuate at least one of the plurality of members, the plurality of members comprising:
a flexible wire having a pre-formed curved shape, the wire being movable within the lumen of the shunt; and
a pusher being at least partially within the body of the delivery instrument and adapted to inhibit proximal movement of the shunt during delivery;
wherein the plurality of members are configured to advance the shunt to a location near the scleral spur and through ciliary attachment tissue.
2. The system of claim 1 , wherein the wire is self-trephinating such that the wire can pass through eye tissue without pre-forming an incision.
3. The system of claim 1 , wherein the shunt is straight.
4. The system of claim 1 , wherein at least a portion of the shunt is curved.
5. The system of claim 1 , wherein the plurality of members further comprise an incising member for creating a corneal incision.
6. The system of claim 1 , wherein at least one of the plurality of members is sufficiently long to advance the shunt transocularly across the anterior chamber to an implantation site.
7. The system of claim 1 , wherein a distal portion of the shunt is configured to be positioned proximal a scleral spur of the eye when in the intended position.
8. The system of claim 7 , wherein the shunt is configured to be positioned less than 0.5 mm posteriorly from the scleral spur.
9. The system of claim 1 , wherein the radial extensions are flexible to facilitate entry through a corneal incision.