Deflectable delivery system for implant delivery
An example catheter includes an elongate member having a wall defining a longitudinally extending lumen, a fixation member disposed on an exterior surface of the wall of a distal portion of the elongate member, a pull wire extending axially through the wall of the elongate member and coupled to the fixation member, and a member portion encasing at least a portion of the fixation member, where the fixation member is shaped to engage the distal member in response to a pull force applied to the pull wire to cause the elongate member to deflect from an initial configuration to a deflected configuration.
1. A catheter comprising:
an elongate member extending from a proximal end to a distal end, wherein the elongate member comprises a wall defining a longitudinally extending lumen;
a fixation member;
a pull wire extending axially through the wall from the proximal end of the elongate member to the fixation member, wherein the pull wire is coupled to the fixation member; and
a distal member extending from the distal end of the elongate member to a distal end of the distal member, wherein the distal member is configured to receive a leadless cardiac pacing device and deploy the leadless cardiac pacing device within a heart of a patient,
wherein the leadless cardiac pacing device comprises a pulse generator configured to deliver pacing therapy,
wherein a distal end of the fixation member is spaced proximally from the distal end of the distal member,
wherein the distal member encases at least a portion of the fixation member,
wherein the fixation member comprises an annular band defining a through-hole, and wherein a portion of the distal member extends through the through-hole to an exterior surface of the wall of the elongate member, and
wherein the elongate member is configured to deflect from an initial configuration to a deflected configuration in response to a pull force applied to the pull wire.
2. The catheter of claim 1 , wherein the annular band defines at least one of a radially outward extending exterior surface or a radially inward extending exterior surface.
3. The catheter of claim 1 , the annular band defines at least one of a convex shape or a concave shape.
4. The catheter of claim 1 , the annular band defines a textured radially exterior surface.
5. The catheter of claim 1 , wherein the pull wire and the fixation member are integrally formed.
6. The catheter of claim 1 , wherein the fixation member comprises a plurality of coil turns defined by a distal portion of the pull wire, wherein the plurality of coil turns extend circumferentially around the wall of the elongate member.
7. The catheter of claim 6 , wherein the plurality of coil turns define at least one of a convex shape or a concave shape.
8. The catheter of claim 6 , wherein the plurality of coil turns define at least one gap between at least a first coil turn and a second coil turn of the plurality of coil turns.
9. The catheter of claim 1 , wherein the fixation member is configured to:
engage an exterior surface of the wall of the elongate member by at least one of a friction fit, a compression fit, or an overmold; and
couple to a distal end of the pull wire.
10. The catheter of claim 1 , wherein the elongate member is further configured to deflect from the deflected configuration to the initial configuration in response to a push force applied to the pull wire.
11. The catheter of claim 1 , wherein the pull wire extends from the proximal end of the elongate member to the fixation member through at least a portion of the wall of the elongate member.
12. The catheter of claim 1 , wherein the wall comprises:
an elongate core layer defining an exterior surface and an interior surface defining the longitudinally extending lumen, wherein the elongate core layer comprises a coiled or braided metal wire;
an inner layer disposed on the interior surface of the elongate core layer; and
an outer layer disposed on the exterior surface of the elongate core layer,
wherein the pull wire is disposed at least one of between the inner layer and the core layer or through the inner layer.
13. The catheter of claim 1 , wherein a distal end of the pull wire comprises at least one of a bulbous structure, a loop, a knot, a weld bead, or a washer.
14. The catheter of claim 1 , wherein the distal member comprises an overmolded polymer.
15. A catheter comprising:
an elongate member extending from a proximal end to a distal end, wherein the elongate member comprises a wall defining a longitudinally extending lumen;
a pull wire extending axially through the wall of the elongate member from the proximal end of the elongate member to a fixation member coupled to the pull wire or integrally formed with the pull wire,
wherein the fixation member comprises a plurality of coil turns defined by a distal portion of the pull wire,
wherein the plurality of coil turns extend circumferentially around the wall of the elongate member,
wherein the plurality of coil turns define at least one gap between at least a first coil turn and a second coil turn of the plurality of coil turns, and
wherein the distal member extends through the at least one gap to an exterior surface of the wall of the elongate member; and
a distal member extending from the distal end of the elongate member to a distal end of the distal member,
wherein the distal member is configured to receive a leadless cardiac pacing device and deploy the leadless cardiac pacing device within a heart of a patient,
wherein the distal member encases the fixation member, and
wherein the fixation member is configured to engage the distal member in response to a pull force applied to the pull wire to cause the elongate member to deflect from an initial configuration to a deflected configuration.
16. The catheter of claim 1 , wherein the fixation member is shaped to engage the distal member.
17. The catheter of claim 1 , wherein the fixation member is disposed on an exterior surface of the wall at a distal portion of the elongate member.
18. The catheter of claim 15 , wherein the fixation member is disposed on an exterior surface of the wall at a distal portion of the elongate member.
19. A method comprising:
forming an elongate member extending from a proximal end to a distal end, wherein the elongate member comprises a wall defining a longitudinally extending lumen;
positioning a fixation member of the elongate member, wherein the fixation member comprises an annular band defining a through-hole;
coupling a pull wire to the fixation member, wherein the pull wire extends through the wall of the elongate member from the proximal end of the elongate member to the fixation member; and
forming a distal member over at least a portion of the fixation member and a portion of the distal portion of the elongate member and extending a portion of the distal member through the through-hole to an exterior surface of the wall of the elongate member, wherein the distal member extends from the distal end of the elongate member to a distal end of the distal member,
wherein the distal member is configured to receive a leadless cardiac pacing device and deploy the leadless cardiac pacing device within a heart of a patient,
wherein the leadless cardiac pacing device comprises a pulse generator configured to deliver pacing therapy,
wherein a distal end of the fixation member is spaced proximally from the distal end of the distal member,
wherein the distal member encases at least a portion of the fixation member, and
wherein the elongate member is configured to deflect from an initial configuration to a deflected configuration in response to a pull force applied to the pull wire.
20. The method of claim 19 , wherein forming the elongate member comprises:
positioning the pull wire adjacent to an exterior surface of an elongate core layer of the elongate member; and
forming an outer layer on an exterior surface of the elongate core layer, wherein the pull wire extends through the outer layer from the proximal end of the elongate member to the fixation member.
21. The method of claim 19 , wherein positioning the fixation member comprises positioning the annular band on an exterior surface of the wall on the distal portion of the elongate member.
22. The method of claim 21 , wherein the annular band comprises at least one of radially outward extending exterior surface, a radially inward extending exterior surface, a convex shape, a concave shape, or a textured radially exterior surface.
23. The method of claim 19 , wherein the fixation member comprises a distal portion of the pull wire.
24. The method of claim 19 , wherein coupling the pull wire to the fixation member comprises welding the distal end of the pull wire to the fixation member.
25. The method of claim 19 , wherein coupling the pull wire to the fixation member comprises overmolding the distal member to onto at least a portion of the fixation member and a distal portion of the pull wire.
26. The method of claim 19 , wherein the elongate member is configured to deflect from the deflected configuration to the initial configuration in response to a push force applied to the pull wire.
27. The method of claim 17 , wherein the fixation member is shaped to engage the distal member.
28. The method of claim 19 , wherein positioning the fixation member comprises disposing the fixation member on an exterior surface of the wall at a distal portion of the elongate member.