Neuromodulation catheters with shafts for enhanced flexibility and control and associated devices, systems, and methods
Neuromodulation catheters with shafts for enhanced flexibility and control and methods of making and using the catheters. A neuromodulation catheter can include an elongated shaft having a distal end portion and a mandrel extending at least along the distal end portion. The mandrel can have an at least substantially solid core. The neuromodulation catheter can further include a transition member and a neuromodulation assembly coupled to the transition member. The transition member can have a proximal portion, a distal portion, and a guide wire lumen extending through the proximal and distal portions. The neuromodulation assembly can extend distally from the distal portion of the transition member, and the mandrel can extend proximally from the proximal portion of the transition member.
1. A neuromodulation device, comprising:
an elongated shaft having a distal end portion;
a neuromodulation assembly having proximal and distal ends and selectively transformable between a low-profile configuration in a delivery state and an expanded configuration sized to fit within a renal artery in a deployed state, wherein the neuromodulation assembly has a helical shape in the deployed state;
a transition member coupled to the distal end portion of the elongated shaft and to the proximal end of the neuromodulation assembly to form a junction therebetween, the transition member being configured to increase device stability and control at the junction;
a guide wire lumen extending between an opening at the distal end of the neuromodulation assembly and an opening at a proximal portion of the transition member; and
a mandrel having a distal end proximal to the neuromodulation assembly, the mandrel bonded to the transition member and extending proximally from the proximal portion of the transition member along at least the distal end portion of the elongated shaft.
2. The neuromodulation device of claim 1 wherein the mandrel is bonded to the proximal portion of the transition member.
3. The neuromodulation device of claim 1 wherein the mandrel extends through at least a portion of the transition member.
4. The neuromodulation device of claim 1 wherein the mandrel extends through the transition member and is bonded to distal portion of the transition member.
5. The neuromodulation device of claim 1 wherein the transition member comprises a braided material.
6. The neuromodulation device of claim 1 wherein the mandrel has a generally constant outer diameter from the distal end of the mandrel to a proximal end of the mandrel.
7. The neuromodulation device of claim 1 wherein the mandrel has a proximal end and the distal end, and wherein the mandrel is tapered from a larger outer diameter at the proximal end to a smaller outer diameter at the distal end.
8. The neuromodulation device of claim 1 wherein the mandrel includes a plurality of stepped longitudinal segments, and wherein the stepped longitudinal segments have progressively larger outer diameters as the mandrel extends proximally away from the neuromodulation assembly.
9. The neuromodulation device of claim 1 wherein the mandrel comprises a first longitudinal segment and a second longitudinal segment, and wherein the first longitudinal segment is less resistant to deflection in response to lateral force than the second longitudinal segment of the mandrel.
10. The neuromodulation device of claim 1 wherein the shaft has a proximal end portion, and wherein the mandrel extends from the distal end portion to the proximal end portion.
11. The neuromodulation device of claim 1 wherein the mandrel has an outer diameter of about 0.051-0.071 cm.
12. The neuromodulation device of claim 1 wherein the guide wire lumen is configured to receive a guide wire for rapid-exchange guide wire procedures.
13. The neuromodulation device of claim 1 , further comprising:
at least one energy delivery wire extending along the mandrel and operably coupled to the neuromodulation assembly; and
an outer covering encapsulating the elongated shaft, the mandrel, and the at least one energy delivery wire.
14. The neuromodulation device of claim 1 wherein the mandrel has an at least substantially solid core.
15. The neuromodulation device of claim 1 wherein the mandrel comprises a first longitudinal segment and a second longitudinal segment, wherein the first longitudinal segment has an outer diameter greater than that of the second longitudinal segment, and wherein the first and second longitudinal segments are separated by a tapered zone that has a continuous taper from the outer diameter of the first longitudinal segment to the outer diameter of the second longitudinal segment.
16. The neuromodulation device of claim 1 wherein the neuromodulation assembly comprises a plurality of electrodes.
17. The neuromodulation device of claim 1 wherein the neuromodulation assembly comprises one or more energy delivery elements.
18. The neuromodulation device of claim 17 wherein the energy delivery elements comprise electrodes.