Exchangeable delivery system for expandable prosthetic devices
View Patent ↗Exchangeable delivery systems, methods of making delivery systems, and methods of delivering a self-expandable prosthetic device are provided. Delivery systems according to embodiments of the invention include an elongate tubular member defining a passageway with a distal end defining an exchange port, and a distal tip member slideably disposed partially within the distal end of the passageway.
1. A delivery system for placing a self-expandable prosthetic device within a body vessel, said delivery system comprising:
an elongate tubular member comprising a circumferential wall and having first proximal and distal ends, the elongate tubular member defining a first passageway extending between the first proximal and distal ends and an exchange port extending through the wall and providing access to the first passageway;
a distal tip member having second proximal and distal ends, defining a second passageway extending between the second proximal and distal ends, and defining a mounting region about which said self-expandable prosthetic device can be disposed, the second proximal end defining a proximal surface and being slideably disposed within the first passageway;
a pusher disposed within the first passageway and comprising a third distal end adapted to interact with the proximal surface of the distal tip member; and
means for retaining the second proximal end of the distal tip member within the first passageway;
wherein the second proximal end of the distal tip member defines a projection directed radially outward;
wherein the means for retaining the second proximal end of the distal tip member within the first passageway comprises a track defined by the wall of the elongate tubular member, wherein the track terminates proximal to the distal end of the elongate tubular member; and
wherein the projection is slideably disposed within the track;
wherein the second proximal end of the distal tip member further defines a second projection directed radially outward;
wherein the means for retaining the second proximal end of the distal tip member within the first passageway further comprises a second track defined by the wall of the elongate tubular member, wherein the second track terminates proximal to the distal end of the elongate tubular member; and
wherein the second projection is slideably disposed within the second track.
2. A delivery system according to claim 1 , wherein a distal portion of the first passageway defines a cavity that receives the second proximal end of the distal tip member.
3. A delivery system according to claim 2 , wherein the elongate tubular member has a first inner diameter at an axial position within the length of the cavity and a second inner diameter at an axial position that is not within the length of the cavity.
4. A delivery system according to claim 3 , wherein the first inner diameter is greater than the second inner diameter.
5. A delivery system according to claim 1 , wherein the distal tip member comprises a taper at the second distal end.
6. A delivery system according to claim 1 , wherein the distal tip member includes a portion having an outer diameter that is greater than an inner diameter of the elongate tubular member at the first distal end.
7. A delivery system according to claim 1 wherein the distal tip member comprises a tip body disposed on a tubular member defining the second passageway.
8. A delivery system according to claim 7 , wherein the tip body is formed of a flexible polymeric material or a gel.
9. A delivery system according to claim 1 , wherein the pusher includes first and second axial portions, the first axial portion having a first diameter and the second axial portion having a second, different diameter.
10. A delivery system according to claim 9 , wherein the first axial portion includes the third distal end of the pusher, and wherein the first diameter is less than the second, different diameter.
11. A delivery system according to claim 10 , wherein the elongate tubular member defines a projection extending into the first passageway of the elongate tubular member.
12. A delivery system according to claim 11 , wherein the pusher includes a transition portion having a diameter that varies from the first diameter to the second diameter, the transition portion defining a transition surface; and
wherein the projection defined by the elongate tubular member is substantially complimentary to the transition surface.
13. A delivery system according to claim 1 , wherein the elongate tubular member includes a reinforcing coil disposed in the wall.