Rotationally torquable endovascular device with actuatable working end
In one exemplary embodiment, an endovascular device may include a hollow shaft having a proximal end and a distal end, and sized for insertion into a blood vessel. The endovascular device may also include a control line having a proximal end and a distal end, and extending through the hollow shaft. The endovascular device may also include an actuatable working element located proximate the distal end of the hollow shaft, and configured to receive an actuation force transmitted via the distal end of the control line. The endovascular device may further include an actuator configured to exert the actuation force on the proximal end of the control line, to thereby cause relative movement between the control line and the hollow shaft and to actuate the working element. The hollow shaft may also include a cable formed of a plurality of wound wires and including a proximal segment, at least one transition segment, and a distal segment. The proximal segment, at least one transition segment, and distal segment may include different numbers of wires.
1. A method of manufacturing an endovascular device, the method including:
forming a hollow shaft sized for insertion into a blood vessel, the hollow shaft having a proximal end and a distal end;
disposing a control line having a proximal end and a distal end through the hollow shaft;
deforming the control line such that the control line has a non-round cross-section, thereby preventing axial rotation between the control line and the hollow shaft; and
connecting an actuator at the proximal end of the control line, wherein the actuator is configured to exert the actuation force on the proximal end of the control line and cause relative movement between the control line and the hollow shaft, wherein forming the hollow shaft includes:
winding a plurality of wires on a winding mandrel at a first pitch angle to form a proximal segment of a cable;
cutting a first subset of the plurality of wires forming the proximal segment, with a first remainder of the plurality of wires remaining;
winding the first remainder of the plurality of wires on the winding mandrel at a second pitch angle to form a transition segment of the cable;
cutting a second subset of the first remainder of the plurality of wires forming the transition segment, with a second remainder of the plurality of wires remaining; and
winding the second remainder of the plurality of wires on the winding mandrel at a third pitch angle to form a distal segment of the cable,
wherein a diameter of the winding mandrel is changed to compensate for a reduction in a number of the plurality of wires, and
wherein a change in the diameter of the winding mandrel is determined based on the number of the plurality of wires, a diameter of the plurality of wires, and a pitch at each segment of the cable.
2. The method of claim 1 , further including changing the diameter of the winding mandrel after winding the plurality of wires at the first pitch angle and before winding the first remainder of the plurality of wires at the second pitch angle, to thereby compensate for a change in pitch angle.
3. The method of claim 1 , further including changing the diameter of the winding mandrel after winding the first remainder of the plurality of wires at the second pitch angle and before winding the second remainder of the plurality of wires at the third pitch angle, to thereby compensate for a change in pitch angle.
4. A method of manufacturing an endovascular device, the method including:
forming a hollow shaft sized for insertion into a blood vessel, the hollow shaft having a proximal end and a distal end;
disposing a control line having a proximal end and a distal end through the hollow shaft;
deforming the control line such that the control line has a non-round cross-section, thereby preventing axial rotation between the control line and the hollow shaft; and
connecting an actuator at the proximal end of the control line, wherein the actuator is configured to exert the actuation force on the proximal end of the control line and cause relative movement between the control line and the hollow shaft, wherein forming the hollow shaft includes:
winding a plurality of wires on a winding mandrel at a pitch angle to form a proximal segment of a cable;
cutting a first subset of the plurality of wires forming the proximal segment, with a first remainder of the plurality of wires remaining;
decreasing a diameter of the winding mandrel;
winding the first remainder of the plurality of wires on the winding mandrel at the pitch angle to form a transition segment of the cable;
cutting a second subset of the first remainder of the plurality of wires forming the transition segment, with a second remainder of the plurality of wires remaining;
decreasing the diameter of the winding mandrel; and
winding the second remainder of the plurality of wires on the winding mandrel at the pitch angle to form a distal segment of the cable,
wherein a change in the diameter of the winding mandrel is determined based on a number of the plurality of wires, a diameter of the plurality of wires, and a pitch at each segment of the cable.
5. The method of claim 1 , further including covering exposed edges of the plurality of wires after cutting with a material.
6. The method of claim 5 , wherein the material includes at least one of an adhesive, an epoxy glue, a heat shrink, or polyether ether ketone (PEEK).
7. The method of claim 1 , further including inserting a material through the hollow shaft to create a non-round cross-section that overlaps with the non-round cross-section of the control line.
8. The method of claim 7 , wherein the material includes a rectangular shaped polymer.
9. The method of claim 7 , wherein inserting the material through the hollow shaft further includes:
heating and inserting the material through holes in a wall of the hollow shaft; and
shaping the material by a rectangular mandrel.