Devices and methods for the removal of lenticular tissue
An exemplary surgical device includes a shaft with a lumen defined therethrough and an element movable from a stored position to a deployed position in which a larger portion of the element extends out of the distal end of the lumen; wherein motion from the stored position to the deployed position causes a first leg of the element to advance distally relative to the distal end of the shaft, and causes a second leg of the element to move proximally relative to the distal end of the shaft.
1. An ophthalmic surgical device comprising:
a handle comprising an actuator;
a hollow shaft extending distally of the handle and defining a longitudinal axis, the hollow shaft comprising a lumen and an outlet from the lumen; and
a sectioning element operably coupled to the handle and extending through the lumen, the sectioning element configured to transition between a collapsed, insertion configuration towards a fully expanded, capture configuration, wherein the sectioning element exits through the outlet during transition toward the fully expanded, capture configuration,
wherein, when in the fully expanded, capture configuration, the sectioning element includes a first leg and a second leg in proximity with one another within the outlet forming a single approximately closed loop with a preset shape having an open area comprising a distal portion positioned distal to the outlet and a proximal portion positioned proximal to the outlet, wherein the proximal portion overlaps a lateral side of the hollow shaft proximal the outlet, and
wherein tensioning the sectioning element with the actuator transitions the sectioning element towards the collapsed, insertion configuration and sections a lens within a capsular bag.
2. The device of claim 1 , wherein the sectioning element is a wire having a first end region coupled to the actuator and a second end region fixed relative to the handle, the open area formed between the first and second end regions of the wire.
3. The device of claim 1 , wherein the actuator tensions the sectioning element to reduce the size of the open area by proximally retracting at least one of the first and second legs.
4. The device of claim 1 , wherein the actuator tensions the sectioning element to reduce the size of the open area by proximally retracting both of the first and second legs.
5. The device of claim 1 , wherein the sectioning element comprises a Nitinol wire or a Nitinol strap.
6. The device of claim 1 , wherein the sectioning element is coated with a material to reduce friction.
7. The device of claim 6 , wherein the coating comprises a hydrophobic material.
8. The device of claim 1 , wherein a distal portion of the hollow shaft is dimensioned for passage through a corneal incision.
9. The device of claim 1 , wherein the outlet in the hollow shaft is near a distal end of the shaft.
10. The device of claim 1 , wherein, with the sectioning element in the fully expanded, capture configuration, a majority of the sectioning element positioned outside the hollow shaft is off-set from a longitudinal axis of the hollow shaft.
11. The device of claim 1 , wherein, with the sectioning element in the fully expanded, capture configuration, a majority of the open area of the sectioning element is off-set to one side of a longitudinal axis of the hollow shaft.
12. The device of claim 1 , wherein the second leg bends more than 120 degrees relative to a longitudinal axis of the hollow shaft when the sectioning element is in the fully expanded, capture configuration.
13. The device of claim 1 , wherein the actuator comprises at least one of a slider and a spring.
14. The device of claim 1 , wherein the preset shape of the sectioning element comprises an unbiased, preset shape.
15. The device of claim 14 , wherein the sectioning element undergoes shape-change toward the unbiased, preset shape during expansion of the sectioning element from the collapsed, insertion configuration toward the fully expanded, capture configuration.
16. The device of claim 14 , wherein the unbiased, preset shape includes an approximately closed, non-planar loop.
17. The device of claim 14 , wherein the unbiased, preset shape is similar in size and shape to a cross-sectional shape of the lens, wherein the cross-section is parallel to a transverse plane extending from an anterior surface of the lens to a posterior surface of the lens.
18. The device of claim 14 wherein the unbiased, preset shape comprises a longer axis that corresponds in length to a major axis of the cross-section of the lens, and a shorter axis that corresponds in length to a minor axis of the cross-section of the lens.