STENT DELIVERY SYSTEM WITH PUSHER ASSEMBLY

• US 20110295354A1
• Filed: 05/27/2011
• Published: 12/01/2011
• Est. Priority Date: 05/27/2010
• Status: Active Grant

• Current Assignee: Idev Technologies, Inc. (Abbott Laboratories)
• Original Assignee: Idev Technologies, Inc. (Abbott Laboratories)
• Inventors: Earles, Ronald G., Igoe, Michael P., Blakeney, Derek, Bueche, Kenneth M.
• Granted Patent: US 9,023,095 B2
• Time in Patent Office: Days
• US Class Current: 623/1.11
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/9517 handle assemblies therefor
• CPC Class Codes: A61F 2/962 having an outer sleeve
• CPC Class Codes: A61F 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
• CPC Class Codes: A61F 2250/0015 differing in density or specific weight
• CPC Class Codes: Y10S 285/908 Extrusion holes

Abstract

A pusher assembly for a stent delivery device includes a distal end of an elongate member and a stent-engaging member having proximal and distal ends. The proximal end of the stent-engaging member is mechanically coupled to the distal end of the inner member by a connector, or the proximal end of the stent-engaging member is at least partially inside the distal end of the elongate inner member. The stent-engaging member includes a portion that radially outwardly extends towards the distal end of the stent-engaging member, or the stent-engaging member includes a portion that radially outwardly extends towards the distal end of the stent-engaging member. The stent-engaging member is configured to move a stent when distally advanced and configured to not move a stent when proximally retracted. A stent delivery device includes an elongate outer member, an elongate inner member coaxially positioned within the outer member, and the pusher assembly.

Claims

1. A pusher assembly for a stent delivery device, the pusher assembly comprising:

a distal end of an elongate inner member;

a stent-engaging member having a proximal end and a distal end, the proximal end of the stent-engaging member being proximate to the distal end of the inner member, the stent-engaging member comprising a portion that radially outwardly extends towards the distal end of the stent-engaging member, the stent-engaging member configured to move a stent when distally advanced and configured to not move a stent when proximally retracted; and

a connector mechanically coupling the distal end of the inner member and the proximal end of the stent-engaging member.

2. The pusher assembly of claim 1, wherein the portion has a shovel shape having a curved distal end.

3. The pusher assembly of claim 1, wherein the stent-engaging member comprises a flex slot.

4. The pusher assembly of claim 1, wherein the stent-engaging member comprises a stem and a ratchet mechanically coupled to the stem, the ratchet comprising the portion.

5. The pusher assembly of claim 4, wherein the stem has a concave proximal end.

6. The pusher assembly claim 1, wherein the inner member comprises an inner layer, a middle layer, and an outer layer, and wherein the distal end of the inner member comprises the inner layer and the middle layer.

7. The pusher assembly of claim 1, wherein the pusher assembly further comprises a tube positioned inward of the stent-engaging member and extending from proximate to the distal end of the inner member to distal to the distal end of the stent-engaging member.

8. The pusher assembly of claim 7, further comprising an atraumatic tip mechanically coupled to the tube.

9. The pusher assembly of claim 7, wherein the inner member at least partially defines a guidewire lumen and wherein the tube at least partially defines the guidewire lumen.

10. A stent delivery device comprising:

an elongate outer member at least partially defining an outer member lumen;

an elongate inner member coaxially positioned within the outer member lumen; and

the assembly of claim 1.

11. A pusher assembly for a stent delivery device, the pusher assembly comprising:

a distal end of an elongate inner member; and

a stent-engaging member having a proximal end and a distal end, the proximal end of the stent-engaging member being at least partially inside the distal end of the elongate inner member, the stent-engaging member comprising a portion that radially outwardly extends towards the distal end of the stent-engaging member, the stent-engaging member configured to move a stent when distally advanced and configured to not move a stent when proximally retracted.

12. The pusher assembly of claim 11, wherein the stent-engaging member has a first internal diameter, wherein the elongate inner member has a second internal diameter proximal to the proximal end of the stent-enganging member, and wherein the first internal diameter is substantially equal to the second internal diameter.

13. The pusher assembly claim 11, wherein the portion has a shovel shape having a curved distal end.

14. The pusher assembly of claim 11, wherein the portion has a shovel shape having a flat distal end.

15. The pusher assembly of claim 11, wherein the portion has a shovel shape having a flared distal end.

16. The pusher assembly of claim 11, wherein the stent-engaging member comprises a stem and a ratchet mechanically coupled to the stem, the ratchet comprising the portion.

17. The pusher assembly of claim 16, wherein the proximal end of the stent-engaging member comprises the stem.

18. The pusher assembly of claim 16, wherein the ratchet is mechanically coupled to the stem by a plurality of spot welds.

19. The pusher assembly of claim 16, wherein the proximal end of the stent-engaging member comprises an aperture, wherein the elongate inner member comprises an inner layer, and wherein the inner layer of the elongate inner member at least partially fills the aperture.

20. The pusher assembly of claim 19, wherein the aperture comprises a plurality of holes.

21. The pusher assembly of claim 11, wherein the distal end of the stent-engaging member comprises a cutout and wherein the pusher assembly further comprises a tube positioned around the distal end of the stent-engaging member and at least partially filling the cutout.

22. The pusher assembly of claim 21, wherein the cutout comprises a plurality of helical slots.

23. The pusher assembly of claim 11, further comprising an atraumatic tip mechanically coupled to the stent-engaging member.

24. A stent delivery device comprising:

an elongate outer member at least partially defining an outer member lumen;

an elongate inner member coaxially positioned within the outer member lumen; and

the assembly of claim 11.

25. A tip for a catheter, the tip comprising:

a proximal end;

a distal end;

a lumen between the proximal end and the distal end;

a generally conical portion proximate to the distal end; and

a generally cylindrical portion proximate to the proximal end, the generally cylindrical portion having an outside surface and comprising at least one aperture configured to allow fluid communication between the proximal end and the outside surface.

26. A stent delivery device comprising:

an elongate outer member at least partially defining an outer member lumen;

an elongate inner member having a proximal end and a distal end, the inner member coaxially positioned within the outer member lumen; and

of claim 25 mechanically coupled to the distal end of the inner member, wherein the at least one aperture is in fluid communication with the outer member lumen.

27. The stent delivery device of claim 26, further comprising a pusher assembly.

28. The stent delivery device of claim 27, wherein the pusher assembly comprises a tube positioned inward of the stent-engaging member and extending from proximate to the distal end of the inner member to distal to the distal end of the stent-engaging member.

29. The stent delivery device of claim 28, wherein the inner member at least partially defines a guidewire lumen and wherein the tube at least partially defines the guidewire lumen.

30. The stent delivery device of claim 28, wherein the tip is mechanically coupled to the tube.