Devices and methods for ocular surgery
A hand-held aspiration device is provided which has a relatively small suction volume along a suction path to improve responsiveness of the aspiration device when the device is activated. The device may be manually powered and may be provided without electronic controls. The device has a suction path which may be purged into a disposal enclosure to reduce the volume of material under the influence of the suction pressure during the procedure. The suction source may also be part of the hand-held unit to further reduce the suction path and suction volume.
1. An ophthalmic surgical device for cutting a lens while the lens is contained within a capsular bag of a human eye, the device comprising:
an elongate shaft defining a longitudinal axis, the elongate shaft comprising a lumen, an opening from the lumen, and a distal-most end, wherein the opening extends through a side wall of the elongate shaft near the distal-most end; and
a sectioning element operably coupled to the elongate shaft and comprising a looped segment configured to transition between a collapsed, insertion configuration and a fully expanded, capture configuration,
wherein transition of the looped segment from the collapsed, insertion configuration towards the fully expanded, capture configuration causes the looped segment to exit the lumen through the opening and causes a proximal portion of the looped segment to move proximally relative to the opening and a distal portion of the looped segment to move distally relative to the opening, and
wherein, when the looped segment is in the fully expanded, capture configuration, the looped segment defines, in part, an open area sized and shaped to receive the lens of the human eye, the proximal portion of the looped segment overlapping a first portion of the side wall that is located proximal to the opening and the distal portion of the looped segment overlapping a second portion of the side wall that is located distal to the opening and is located distal to the distal-most end of the elongate shaft,
wherein transitioning the looped segment from the fully expanded, capture configuration towards the collapsed, insertion configuration is configured to cut the lens positioned within the open area.
2. The device of claim 1 , wherein the elongate shaft comprises a first shaft part and a second shaft part, wherein the sectioning element has a first end coupled to the first shaft part and a second end coupled to the second shaft part.
3. The device of claim 2 , wherein the looped segment transitions towards the fully expanded, capture configuration when the first and second shaft parts move from a first position to a second position.
4. The device of claim 1 , wherein the looped segment advances between the capsular bag and the lens as the looped segment is transitioned towards the fully expanded, capture configuration.
5. The device of claim 1 , wherein the looped segment comprises a first flexible portion, a second flexible portion, and an intermediate portion located between the first and second flexible portions.
6. The device of claim 5 , wherein the intermediate portion of the looped segment moves laterally outward through the opening during transition towards the fully expanded, capture configuration.
7. The device of claim 6 , wherein the first and second flexible portions of the looped segment are stiffer than the intermediate portion.
8. The device of claim 1 , wherein the sectioning element is unbiased when in the collapsed, insertion configuration.
9. The device of claim 1 , wherein the sectioning element has a preset shape and is unbiased when in the fully expanded, capture configuration.
10. The device of claim 1 , wherein the sectioning element comprises a superelastic wire.
11. The device of claim 1 , wherein the elongate shaft and the sectioning element when the looped segment is in the collapsed, insertion configuration are dimensioned for passage through an incision in the cornea via an ab interno approach.