Medical device delivery systems

1. A stent delivery system, comprising:

an inner member;

wherein a stent receiving region is defined along the inner member;

a deployment sheath slidably disposed along the inner member; and

a stent holding member pivotably coupled to the inner member at a position proximal of the stent receiving region, the stent holding member being designed to shift between a first configuration where a distal end of the stent holding member contacts the inner member and a second configuration where the distal end of the stent holding member is radially spaced from the inner member, and wherein the stent holding member is in the first configuration when the stent holding member is not covered by the deployment sheath and wherein the distal end of the stent holding member is closer to the inner member when in the first configuration than when in the second configuration.

2. The stent delivery system of claim 1 , wherein the stent holding member includes an outwardly extending region and an angled region.

3. The stent delivery system of claim 2 , wherein the angled region has an angle that remains constant when the stent holding member shifts between the first configuration and the second configuration.

4. The stent delivery system of claim 1 , wherein the stent holding member is in the first configuration when the deployment sheath is positioned about the stent holding member.

5. The stent delivery system of claim 1 , wherein the stent holding member shifts to the second configuration when the deployment sheath is retracted to a position proximal of the distal end of the stent holding member.

6. The stent delivery system of claim 1 , further comprising a stent disposed along the stent receiving region.

7. The stent delivery system of claim 6 , wherein the distal end of the stent holding member is designed to interdigitate with the stent.

8. The stent delivery system of claim 6 , wherein the stent is a self-expanding stent.

9. A stent delivery system, comprising:

an inner member;

wherein a stent receiving region is defined along the inner member;

a deployment sheath slidably disposed along the inner member;

a stent retainer pivotably disposed adjacent to the stent receiving region, the stent retainer having an outwardly extending region, an angled region, and a distal end designed to be positioned distally of a proximal end of a stent disposed along the stent receiving region; and

wherein the stent retainer is designed to shift between a first configuration and a second configuration, wherein when the stent retainer is in the first configuration the angled region is disposed radially outward of an outer surface of the stent and where the distal end of the stent retainer contacts the inner member, wherein when the stent retainer is in second configuration the distal end of the stent retainer is radially spaced from the inner member, wherein the stent retainer is in the first configuration when the stent retainer is not covered by the deployment sheath, and wherein the distal end of the stent retainer is closer to the inner member when in the first configuration than when in the second configuration.

10. The stent delivery system of claim 9 , wherein the angled region has an angle that remains constant when the stent retainer shifts between the first configuration and the second configuration.

11. The stent delivery system of claim 9 , wherein the stent retainer is in the first configuration when the deployment sheath is positioned about the stent retainer.

12. The stent delivery system of claim 9 , wherein the stent retainer shifts to the second configuration when the deployment sheath is retracted to a position proximal of the distal end of the stent retainer.

13. The stent delivery system of claim 9 , wherein the distal end of the stent retainer is designed to interdigitate with the stent.

14. A stent delivery system, comprising:

an inner member;

wherein a stent receiving region is defined along the inner member;

a self-expanding stent disposed along the stent receiving region;

a deployment sheath slidably disposed along the inner member;

a stent retainer pivotably disposed adjacent to the stent receiving region, the stent retainer having an outwardly extending region, an angled region, and a distal end designed to be positioned distally of a proximal end of the stent;

wherein the stent retainer is designed to shift between a first configuration and a second configuration, wherein when the stent retainer is in the first configuration the angled region is disposed radially outward of an outer surface of the stent and where the distal end of the stent retainer contacts the inner member, wherein when the stent retainer is in second configuration the distal end of the stent retainer is radially spaced from the inner member, wherein the stent retainer is in the first configuration when the stent retainer is not covered by the deployment sheath, and wherein the distal end of the stent retainer is closer to the inner member when in the first configuration than when in the second configuration; and

wherein the angled region has an angle that remains constant when the stent retainer shifts between the first configuration and the second configuration.

15. The stent delivery system of claim 14 , wherein the stent retainer is in the first configuration when the deployment sheath is positioned about the stent retainer.

16. The stent delivery system of claim 14 , wherein the stent retainer shifts to the second configuration when the deployment sheath is retracted to a position proximal of the distal end of the stent retainer.

17. The stent delivery system of claim 14 , wherein the distal end of the stent retainer is designed to interdigitate with the stent.