Intraluminal tissue modifying systems and associated devices and methods
The present technology is directed generally to devices, systems, and methods for capturing and cutting fibrous and trabeculated structures (such as synechiae) in vessel lumens. In one embodiment, the present technology includes an intraluminal tissue modifying system configured to capture the fibrous structures, put the fibrous structures in tension, and controllably cut through the fibrous structures without applying appreciable additional force to the vessel wall. The system may include an expandable capture device and a cutting device.
1. A device for modifying intraluminal tissue, the device comprising:
an outer shaft having a proximal portion and a distal portion, the outer shaft defining a lumen extending between the proximal portion and the distal portion, wherein the outer shaft includes a plurality of slots extending along a length of the distal portion, and wherein the portions of the outer shaft between the slots define capture members, each of the capture members including a distal joint at its distal terminus, a proximal joint at its proximal terminus, and an intermediate joint positioned along its length between the distal and proximal joints; and
an inner shaft disposed within the lumen, wherein a distal end region of the inner shaft is fixed to a distal end region of the outer shaft such that proximal movement of the inner shaft with respect to the outer shaft pulls distal portions of the capture members proximally and forces the capture members to bend outwardly away from the longitudinal axis of the outer shaft,
wherein each of the capture members, when deployed, include a generally curved distal segment extending between its distal joint and its intermediate joint, and a generally curved, concave proximal segment extending between its intermediate joint and its proximal joint.
2. The device of claim 1 wherein each of the capture members are configured to preferentially flex or bend at each of their respective distal, proximal, and intermediate joints.
3. The device of claim 1 wherein at least one of the distal joint, the proximal joint, and the intermediate joint is formed by opposing recesses in the respective capture member.
4. The device of claim 3 wherein the at least one of the distal, proximal, and intermediate joints comprises a living hinge.
5. The device of claim 1 wherein at least one of the distal, proximal, and intermediate joints comprises at least one of a small pin, an elastic polymeric element, and a mechanical hinge.
6. The device of claim 1 wherein the outer shaft is configured to preferentially flex or bend at each of the distal, proximal, and intermediate joints.
7. The device of claim 1 wherein, in response to longitudinal stresses caused by proximal movement of the inner shaft, the capture members deform into a predetermined shape.
8. The device of claim 1 wherein each of the proximal segments extend outwardly from the outer shaft in a proximal direction, thereby forming a capture region between the respective proximal segment and the outer shaft.
9. The device of claim 1 wherein each of the proximal segments is concave towards the outer shaft and each of the distal segments is concave towards the outer shaft.
10. The device of claim 1 wherein each of the proximal segments include elongated openings extending along at least a portion of its length.
11. The device of claim 10 wherein the inner shaft is configured to slidably receive a cutting device having a plurality of expandable cutting elements, and wherein when the cutting device is in a deployed state, each of the cutting elements extend outwardly away from the central longitudinal axis of the shaft through a corresponding one of the openings in the respective proximal segment.
12. The device of claim 1 wherein the inner shaft defines a lumen therethrough.
13. The device of claim 1 wherein the inner shaft is configured to receive a cutting device.
14. A device for modifying intraluminal tissue, the device comprising:
an outer shaft having a proximal portion and a distal portion, the outer shaft defining a lumen extending between the proximal portion and the distal portion, wherein the outer shaft includes a plurality of slots extending along a length of the distal portion, and wherein the portions of the outer shaft between the slots define capture members, each of the capture members including a distal joint at its distal terminus, a proximal joint at its proximal terminus, and an intermediate joint positioned along its length between the distal and proximal joints; and
an inner shaft disposed within the lumen, wherein a distal end region of the inner shaft is fixed to a distal end region of the outer shaft such that proximal movement of the inner shaft with respect to the outer shaft pulls distal portions of the capture members proximally and forces the capture members to bend outwardly away from the longitudinal axis of the outer shaft,
wherein at least one of the capture members, when deployed, includes a generally curved, concave proximal segment extending between its intermediate joint and its proximal joint.
15. The device of claim 14 , further comprising a cutting device configured to be slidably received within the inner shaft.
16. A device for modifying intraluminal tissue, the device comprising:
an outer shaft having a proximal portion and a distal portion, the outer shaft defining a lumen extending between the proximal portion and the distal portion, wherein the outer shaft includes a plurality of slots extending along a length of the distal portion, and wherein the portions of the outer shaft between the slots define capture members, each of the capture members including a distal joint at its distal terminus, a proximal joint at its proximal terminus, and an intermediate joint positioned along its length between the distal and proximal joints;
an inner shaft disposed within the lumen, wherein a distal end region of the inner shaft is fixed to a distal end region of the outer shaft such that proximal movement of the inner shaft with respect to the outer shaft pulls distal portions of the capture members proximally and forces the capture members to bend outwardly away from the longitudinal axis of the outer shaft; and
a cutting device having at least one expandable cutting element and configured to be slidably received within the inner shaft,
wherein
at least one of the capture members, when deployed, includes a generally curved proximal segment extending between its intermediate joint and its proximal joint,
at least one of the proximal segments includes an elongated opening extending along at least a portion of its length, and
when the cutting device is in a deployed state, the cutting element extends outwardly away from the central longitudinal axis of the inner shaft through the opening in the respective proximal segment.