Medical device with distal torque control
A catheter with a distal end that rotates through the conversion of linear motion to rotational motion, thus the distal end may be rotated without longitudinally advancing or retracting the distal end. The catheter includes a tube with a single helix or a dual chirality helix cut into the tube, a distal end segment, means for linear displacement of the helix, and means for coupling the junction point of the helix to the distal segment.
1. A device comprising:
a tube with a longitudinal axis having a proximal end and a distal end;
at least one partial cut located at, along or near the distal end of the tube, the at least one partial cut comprising an orientation that is angled relative to both the longitudinal axis and an axis transverse to the longitudinal axis;
a pusher member slidably positioned within a lumen of the tube and configured to impart a force along the at least one partial cut of the tube, wherein the distal end of the tube is configured to at least partially rotate relative to the longitudinal axis when the pusher member imparts a force along the at least one partial cut of the tube; and
an expandable member;
wherein the pusher member is configured to selectively engage at least a portion of the tube along the distal end using the expandable member, the pusher member configured to impart a force along the at least one partial cut of the tube when the pusher member engages the tube and the pusher member is moved relative to the tube to cause the distal end of the tube to at least partially rotate relative to the longitudinal axis; and
wherein a degree of rotation of the distal end of the tube is proportional to a linear displacement of the at least one partial cut.
2. The device of claim 1 , wherein the at least one partial cut extends throughout an entire thickness of a wall of the tube.
3. The device of claim 1 , wherein the at least one partial cut does not extend throughout an entire thickness of a wall of the tube.
4. The device of claim 1 , wherein the at least one partial cut comprises a spiral or helical shape.
5. The device of claim 4 , wherein an angle of the at least one partial cut relative to the longitudinal axis is between 10 and 80 degrees.
6. The device of claim 1 , wherein the pusher member is configured to selectively engage at least a portion of the tube along the distal end of the tube using the expandable member.
7. The device of claim 6 , wherein the expandable member comprises a reversibly expandable member.
8. The device of claim 6 , wherein the expandable member is positioned at least partially radially between the tube and the pusher member along the distal end of the tube.
9. The device of claim 1 , wherein the pusher member comprises a lumen.
10. The device of claim 1 , wherein the pusher member comprises a wire.
11. A device comprising:
a first member with a longitudinal axis having a proximal end and a distal end;
at least one partial cut located at, along or near the distal end of the first member, the at least one partial cut comprising an orientation that is angled relative to both the longitudinal axis and an axis transverse to the longitudinal axis; and
a second member positioned adjacent the first member and configured to impart a force along the at least one partial cut of the first member, wherein the distal end of the first member is configured to at least partially rotate relative to the longitudinal axis when the second member imparts a force along the at least one partial cut of the first member;
wherein the second member is configured to selectively engage at least a portion of the first member along the distal end, the second member configured to impart a force along the at least one partial cut of the first member when the second member engages the first member and the second member is manipulated to cause the distal end of the first member to at least partially rotate relative to the longitudinal axis; and
wherein a degree of rotation of the distal end of the first member is proportional to a linear displacement of the at least one partial cut.
12. The device of claim 11 , wherein the at least one partial cut extends throughout an entire thickness of a wall of the first member.
13. The device of claim 11 , wherein the at least one partial cut does not extend throughout an entire thickness of a wall of the first member.
14. The device of claim 11 , wherein the at least one partial cut comprises a spiral or helical shape.
15. The device of claim 14 , wherein an angle of the at least one partial cut relative to the longitudinal axis is between 10 and 80 degrees.
16. The device of claim 11 , wherein the second member is configured to selectively engage at least a portion of the first member using an expandable member.
17. The device of claim 16 , wherein the expandable member comprises a reversibly expandable member.
18. The device of claim 16 , wherein the expandable member is positioned radially between the first member and the second member along the distal end of the first member.
19. The device of claim 11 , wherein the second member comprises a lumen.
20. The device of claim 11 , wherein the first member comprises a tube and the second member comprises a wire.