Shunting systems with rotation-based flow control assemblies, and associated systems and methods
The present technology relates to intraocular shunting systems and methods. In some embodiments, the present technology includes intraocular shunting systems that include a drainage element having an inflow portion configured for placement within an anterior chamber of the eye outside of an optical field of view of the patient and an outflow portion configured for placement at a different location of the eye. The system can also include a flow control assembly having a rotational control element operably coupled to the drainage element. The flow control assembly can further include an actuation structure coupled to the rotational control element and configured to selectively change an orientation of the rotational control element. An amount of fluid through the inflow portion and/or the outflow portion can vary based on the selected orientation of the rotational control element.
1 . An implantable actuator for selectively controlling a fluid resistance of an implantable shunting system, the actuator comprising:
a moveable element;
a first actuation element including a first actuatable region, wherein the first actuation element has a first axial length and the first actuatable region has a second axial length that is less than the first axial length, and wherein, in response to being actuated, the first actuation element is configured to rotate the moveable element in a first direction; and
a second actuation element including a second actuatable region, wherein the second actuation element has a third axial length and the second actuatable region has a fourth axial length that is less than the third axial length, wherein, in response to being actuated, the second actuation element is configured to rotate the moveable element in a second direction that is different than the first direction.
2 . The actuator of claim 1 wherein the second axial length comprises between about 10% and about 60% of the first axial length, and wherein the fourth axial length comprises between about 10% and about 60% of the third axial length.
3 . The actuator of claim 1 wherein the actuator is configured such that a first ratio of the first axial length to the second axial length changes in response to the first actuation element being actuated, and a second ratio of the third axial length to the fourth axial length changes in response to the second actuation element being actuated.
4 . The actuator of claim 3 wherein the first ratio increases in response to the first actuation element being actuated, and wherein the second ratio increases in response to the second actuation element being actuated.
5 . The actuator of claim 1 wherein at least one of the first actuatable region or the second actuatable region has a serpentine shape.
6 . The actuator of claim 1 wherein at least one of the first actuatable region or the second actuatable region has a sawtooth shape.
7 . The actuator of claim 1 wherein the first actuatable region includes a first curved region having a first opening and a second curved region having a second opening, wherein the first opening and the second openings face in generally opposite directions.
8 . The actuator of claim 7 wherein the first opening and the second opening both face generally parallel to a long axis of the first actuation element.
9 . The actuator of claim 7 wherein the first opening and the second opening both face generally perpendicular to a long axis of the first actuation element.
10 . The actuator of claim 7 wherein the first curved region and the second curved region are generally U-shaped or horseshoe-shaped.
11 . The actuator of claim 1 wherein the first actuation element has a first axis extending along the first axial length, and wherein the first actuatable region includes a segment extending along a second axis.
12 . The actuator of claim 11 wherein an angle between the first axis and the second axis is between about 70 degrees and about 110 degrees.
13 . The actuator of claim 11 wherein the second axis is perpendicular or at least about perpendicular to the first axis.
14 . The actuator of claim 11 wherein an angle between the first axis and the second axis is less than about 30 degrees.
15 . The actuator of claim 11 wherein the second axis is parallel or at least about parallel to the first axis.
16 . The actuator of claim 11 wherein the actuator is configured such that an angle between the first axis and the second axis changes in response to (a) the actuator being deformed relative to its preferred geometry, and/or (b) the first actuation element being actuated after being deformed relative to its preferred geometry.
17 . The actuator of claim 1 wherein the actuator is composed at least in part of a shape memory material.
18 . The actuator of claim 1 wherein the actuator is formed as a unitary structure.