Stent delivery system allowing controlled release of a stent

• US 7,303,580 B2
• Filed: 07/26/2004
• Issued: 12/04/2007
• Est. Priority Date: 07/26/2004
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Incorporated (Cook Group Incorporated)
• Inventors: Parker, Fred T.
• Primary Examiner(s): Nguyen; Anhtuan T.
• Assistant Examiner(s): Neal; Timothy J
• Application Number:
  US10/899,502
• Publication Number:
  US 20060020321A1
• Time in Patent Office: 1,226 Days
• Field of Search: 623/1.11, 623/1.2, 623/1.15, 623/1.3
• US Class Current: 623/1.11
• CPC Class Codes: A61F 2/86 Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/91575 connected peak to trough
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61F 2220/0041 using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2250/0039 differing in diameter

Abstract

A stent delivery system includes a stent having at least one eyelet and at least one rivet and a holder supporting the stent, wherein the holder includes a first section having a first diameter and a second section having a second diameter. A sheath covers the stent and the holder. The rivets are attached to each of the eyelets. A first inner diameter of the stent at the position of the rivets is smaller than a second inner diameter of the stent at other positions because the rivets protrude inwardly. A shoulder is formed on the holder due to the difference between the first diameter and the second diameter of the holder. The shoulder is positioned distally adjacent the rivets. The shoulder interferes with the protruding rivets, thereby restraining the longitudinal movement of the stent relative to the holder. Although the sheath is pulled back, the stent does not jump out of the stent delivery system. As a result, the stent delivery system allows the stent to be released in a controlled manner upon its deployment.

Claims

1. A stent delivery system, comprising:

a generally cylindrical stent expandable from a collapsed state to an expanded state, the stent comprising a first portion having a first inner diameter and a second portion having a second inner diameter, the first inner diameter being smaller than the second inner diameter wherein the difference between the first inner diameter and the second inner diameter of the stent is the same in both the collapsed state and the expanded state; and

,

a generally cylindrical holder comprising a first section having a first diameter and a second section having a second diameter, the first diameter being smaller than the second diameter, wherein a shoulder is formed between the first section and the second section of the holder, the shoulder being disposed distally adjacent the first portion of the stent; and

,

wherein the stent is collapsed onto the holder, the second diameter of the holder being larger than the first inner diameter of the collapsed stent and smaller than the second inner diameter of the collapsed stent, the shoulder overlapping the first portion of the stent.

2. The stent delivery system of claim 1, wherein the second section of the holder comprises a bump integrally formed with the holder.

3. The stent delivery system of claim 1, wherein the second section of the holder comprises a sleeve installed onto the holder.

4. The stent delivery system of claim 1, wherein the first portion of the stent comprises at least one eyelet and at least one rivet.

5. The stent delivery system of claim 1, wherein the first portion of the stent comprises at least one radiopaque marker.

6. The stent delivery system of claim 1, wherein a difference between the first inner diameter and the second inner diameter of the stent is less than about 0.006 inch.

7. The stent delivery system of claim 1, wherein the shoulder has a distance of less than 0.003 inch.

8. The stent delivery system of claim 1, wherein the first inner diameter of the stent is less than the second diameter of the holder by about 0.005 inch.

9. The stent delivery system of claim 1, wherein the first portion of the stent is in direct contact with the shoulder of the holder.

10. The stent delivery system of claim 1, wherein the holder further comprises a third section having a third diameter, the third diameter being smaller than the second diameter, wherein the third section is distally disposed relative to the second section.

11. The stent delivery system of claim 1, wherein the first portion of the stent comprises at least one eyelet and at least one rivet, and the second section of the holder comprises a bump integrally formed with the holder.

12. The stent delivery system of claim 1, wherein the first portion of the stent comprises at least one eyelet and at least one rivet, and the second section of the holder comprises a sleeve installed onto the holder.

13. The stent delivery system of claim 1, wherein the first portion of the stent is in direct contact with the shoulder of the holder and the second section of the holder comprises a bump integrally formed with the holder.

14. A stent delivery system, comprising:

a generally cylindrical stent expandable from a collapsed state to an expanded state, the stent comprising a first portion having a first inner diameter and a second portion having a second inner diameter, the first inner diameter being smaller than the second inner diameter wherein the difference between the first inner diameter and the second inner diameter of the stent is the same in both the collapsed state and the expanded state; and

,

a generally cylindrical holder comprising a first section having a first diameter, a second section having a second diameter, a third section having a third diameter and a fourth section having a fourth diameter, the first diameter being smaller than the second diameter, the second diameter being smaller than the fourth diameter and the third diameter being smaller than the second diameter and the third section disposed distally adjacent the second section, wherein a shoulder is formed between the first section and the second section and a groove is formed by the first section, the second section and the fourth section; and

,

wherein the stent is collapsed onto the holder, the second diameter of the holder being larger than the first inner diameter of the collapsed stent and smaller than the second inner diameter of the collapsed stent and the shoulder is disposed distally adjacent the first portion of the stent and overlapping the first portion of the stent, thereby temporarily restraining a longitudinal movement of the stent relative to the holder.

15. The stent delivery system of claim 14, wherein the stent further comprises at least one eyelet and at least one rivet, the eyelet and the rivet forming the first portion of the stent and being disposed in the groove.

16. The stent delivery system of claim 14, wherein the stent further comprises at least one radiopaque marker, the radiopaque marker forming the first portion of the stent and being disposed in the groove.

17. The stent delivery system of claim 14, wherein the second section of the holder comprises a bump integrally formed with the holder.

18. The stent delivery system of claim 14, wherein the second section of the holder comprises a sleeve installed onto the holder.

19. The stent delivery system of claim 14, wherein the first inner diameter of the stent is less than the second diameter of the holder by about 0.005 inch.

20. The stent delivery system of claim 14, wherein the shoulder has a distance of less than about 0.003 inch.

21. The stent delivery system of claim 14, wherein a difference between the first inner diameter and the second inner diameter of the stent is less than about 0.006 inch.

22. The stent delivery system of claim 14, wherein the fourth section of the holder comprises a holder band integrally formed with the holder.

23. The stent delivery system of claim 14, wherein the first portion of the stent is in direct contact with the shoulder of the holder.

24. The stent delivery system of claim 14, wherein the stent further comprises at least one eyelet and at least one rivet, the eyelet and the rivet forming the first portion of the stent and being disposed in the groove and the second section of the holder comprises a bump integrally formed with the holder.

25. The stent delivery system of claim 14, wherein the stent further comprises at least one eyelet and at least one rivet, the eyelet and the rivet forming the first portion of the stent and being disposed in the groove and the second section of the holder comprises a sleeve installed onto the holder.

26. The stent delivery system of claim 14, wherein the stent further comprises at least one eyelet and at least one rivet, the eyelet and the rivet forming the first portion of the stent and being disposed in the groove and the fourth section of the holder comprises a holder band integrally formed with the holder.

27. The stent delivery system of claim 14, wherein the first portion of the stent is in direct contact with the shoulder of the holder and the second section of the holder comprises a bump integrally formed with the holder.