Stent and method and device for packing of same

• US 6,776,791 B1
• Filed: 11/05/1999
• Issued: 08/17/2004
• Est. Priority Date: 04/01/1998
• Status: Expired due to Term

• Current Assignee: EndoVascular Technologies Incorporated (Boston Scientific Corporation)
• Original Assignee: EndoVascular Technologies Incorporated (Boston Scientific Corporation)
• Inventors: Stallings, Jody W., Ahari, Frederick
• Primary Examiner(s): McDermott, Corrine
• Assistant Examiner(s): STEWART, ALVIN J
• Application Number:
  US09/434,962
• Time in Patent Office: 1,747 Days
• Field of Search: 623/1.11, 606/194, 606/195, 606/198, 606/140, 606/141, 606/208, 600/36, 604/15, 604/93.01, 604/96.01
• US Class Current: 623/1.11
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/89 the wire-like elements comprising two or more adjacent rings flexibly connected by separate members
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/9522 Means for mounting a stent or stent-graft onto or into a placement instrument
• CPC Class Codes: A61F 2/9525 using a funnel
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2230/0067 conical
• CPC Class Codes: A61F 2230/008 paraboloidal

Abstract

A method for inserting a stent into the delivery sheath of a stent/graft deployment catheter. The stent has V hooks on its proximal end which are positively engageable by projections attached to a stent/graft deployment catheter plunger. The proximal end of the stent is manually squeezed over the V hooks such that the V hooks engage the projections. The catheter is passed through the center of a funnel. While maintaining pressure on the stent and the V hooks, the plunger is withdrawn so as to pull the stent into the delivery sheath through the center of the funnel. The funnel guides the stent into the delivery sheath and gradually compresses the stent as it approaches the delivery sheath.

Claims

1. A method for inserting a stent into a deployment catheter, said deployment catheter comprising an outer tube, a plunger at least partially disposed within said outer tube and having a longitudinal dimension, and a stent engagement means connected to a distal end of the plunger for engaging a proximal end of a stent such that the stent engagement means is expandable away from the longitudinal dimension of the plunger, comprising the steps of:

a) permitting the stent engagement means to expand away from the longitudinal dimension of the plunger;

b) engaging the stent engagement means and a proximal end of the stent;

c) cooling the stent; and

d) moving the plunger and outer tube relative to each other such that the stent is pulled into and disposed within the outer tube;

wherein the stent engagement means comprises one or more L-shaped hook-like elements.

2. The method as claimed in claim 1 wherein a proximal end of the stent has a catheter engagement means and wherein the stent engagement means engages the catheter engagement means.

3. The method as claimed in claim 2 wherein the catheter engagement means comprises one or more substantially V-shaped elements connected to the proximal end of the stent.

4. The method as claimed in claim 1 further comprising the preliminary step of passing the deployment catheter through a funnel.

5. The method as claimed in claim 1 wherein the stent is made from a shape memory alloy and further comprising the preliminary step of cooling the stent below its transformation temperature prior to moving the plunger and outer tube relative to each other such that the stent is pulled into and disposed within the outer tube.

6. A method for inserting a stent into a deployment catheter, said deployment catheter comprising an outer tube, a plunger at least partially disposed within said outer tube and having a longitudinal dimension, and a stent engagement means connected to a distal portion of the plunger for engaging a proximal end of a stent such that the stent engagement means can expand away from the longitudinal dimension of the plunger, comprising the steps of:

a) permitting the stent engagement means to expand away from the longitudinal dimension of the plunger;

b) passing the deployment catheter through the center of a funnel;

c) cooling the stent;

d) engaging the stent engagement means and a proximal end of the stent;

e) while maintaining the engagement of the stent engagement means and the stent, positioning the deployment catheter relative to the funnel such that funnel maintains the engagement of the stent engagement means and the stent; and

f) moving the plunger and outer tube relative to each other such that the stent is pulled into and disposed within the outer tube.

7. The method as claimed in claim 6 wherein the stent further comprises a catheter engagement means connected to its proximal end and wherein the stent engagement means engages said catheter engagement means.

8. The method as claimed in claim 7 wherein the catheter engagement means comprises substantially V-shaped elements.

9. The method as claimed in claim 8 wherein the stent engagement means comprises one or more hook-like elements connected to a distal portion of the plunger.

10. The method as claimed in claim 9 wherein the stent engagement means and the catheter engagement means are engaged by compressing the proximal end of the stent so as to hook the V-shaped elements onto the hook-like elements such that a force applied to the plunger along the lengthwise axis of the deployment catheter away from a distal end of the deployment catheter pulls the stent in the same direction as the force.

11. The method as claimed in claim 9 wherein the stent comprises a plurality of parallel struts connected by a plurality of connecting members and wherein the catheter engagement means comprises hooks having two ends each of which is attached to the proximal end of an adjacent stent strut.

12. The method as claimed in claim 6 wherein the stent is made from a shape memory alloy and further comprising the step of cooling the stent below its transformation temperature prior to moving the plunger and outer tube relative to each other such that the stent is pulled into and disposed within the outer tube.

13. A stent deployment catheter comprising an outer tube, a plunger at least partially disposed within said outer tube and having a longitudinal dimension, and a stent engagement means being outwardly biased by a coil portion connected to a distal end of the plunger for engaging a proximal end of a stent, the stent engagement means being outwardly biased such that the stent engagement means is configured to expand away from the longitudinal dimension of the plunger, wherein the stent engagement means comprises one or more L-shaped hook-like elements.

14. The stent deployment catheter as claimed in claim 13 wherein the one or more hook-like elements of the stent engagement means are connected to a distal portion of the plunger.

15. The stent deployment catheter as claimed in claim 14 wherein the hook-like elements project from a distal end of the plunger.

16. The stent deployment catheter as claimed in claim 13 wherein the engagement means comprises a tubular body having a distal surface.

17. The stent deployment catheter of claim 13, the stent engagement means further comprising a coiled portion.

18. A method inserting a stent into a deployment catheter, said deployment catheter comprising an outer tube, a plunger at least partially disposed within said outer tube and having a longitudinal dimension, and a stent engagement device connected to a distal end of the plunger that engages a proximal end of a stent the stent engagement device being outwardly biased such that the stent engagement means is expandable away from the longitudinal dimension of the plunger, comprising:

a) permitting the stent engagement device to expand away from the longitudinal dimension of the plunger;

b) engaging the stent engagement device and a proximal end of the stent;

c) cooling the stent; and

d) moving the plunger and outer tube relative to each other such that the stent is pulled into and disposed within the outer tube;

wherein the stent engagement device comprises one or more L-shaped hook-like elements.

19. The method as claimed in claim 18 wherein a proximal end of the stent has a catheter engagement device and wherein the stent engagement device engages the catheter engagement device.

20. The method as claimed in claim 19 wherein the catheter engagement device comprises one or more substantially V-shaped elements connected to the proximal end of the stent.

21. The method as claimed in claim 18 further comprising passing the deployment catheter through a funnel.

22. The method as claimed in claim 18 wherein the stent is made from a shape memory alloy and further comprising cooling the stent below its transformation temperature prior to moving the plunger and outer tube relative to each other such that the stent is pulled into and disposed within the outer tube.

23. A method inserting a stent into a deployment catheter, said deployment catheter comprising an outer tube, a plunger at least partially disposed within said outer tube and having a longitudinal dimension, and a stent engagement device connected to a distal portion of the plunger that engages a proximal end of a stent such that the stent engagement device is expandable away from the longitudinal dimension of the plunger, comprising:

a) permitting the stent engagement device to expand away from the longitudinal dimension of the plunger;

b) passing the deployment catheter through the center of a funnel;

c) cooling the stent;

d) engaging the stent engagement device and a proximal end of the stent;

e) while maintaining the engagement of the stent engagement device and the stent, positioning the deployment catheter relative to the funnel such that the funnel maintains the engagement of the stent engagement device and the stent; and

f) moving the plunger and outer tube relative to each other such that the stent is pulled into and disposed within the outer tube.

24. The method as claimed in claim 23 wherein the stent further comprises a catheter engagement device connected to its proximal end and wherein the stent engagement device engages the catheter engagement device.

25. The method as claimed in claim 24 wherein the catheter engagement device comprises substantially V-shaped elements.

26. The method as claimed in claim 25 wherein the stent engagement device comprises one or more hook-like elements connected to a distal portion of the plunger.

27. The method as claimed in claim 26 wherein the stent engagement device and the catheter engagement device are engaged by compressing the proximal end of the stent so as to hook the V-shaped elements onto the hook-like elements such that a force applied to the plunger along the lengthwise axis of the deployment catheter away from a distal end of the deployment catheter pulls the stent in the same direction as the force.

28. The method as claimed in claim 26 wherein the stent comprises a plurality of parallel struts connected by a plurality of connecting members and wherein the catheter engagement device comprises hooks having two ends each of which is attached to the proximal end of an adjacent stent strut.

29. The method as claimed in claim 23 wherein the stent is made from a shape memory alloy and further comprising cooling the stent below its transformation temperature prior to moving the plunger and outer tube relative to each other such that the stent is pulled into and disposed within the outer tube.

30. A stent deployment catheter comprising an outer tube, a plunger at least partially disposed within said outer tube and having a longitudinal dimension, and a stent engagement means being outwardly biased by a coil portion connected to a distal end of the plunger for engaging a proximal end of a stent the stent engagement means being outwardly biased such that the stent engagement means expands away from the longitudinal dimension of the plunger, wherein the stent engagement means comprises one or more hook-like elements.

31. The stent deployment catheter as claimed in claim 30 wherein the one or more hook-like elements are connected to a distal portion of the plunger.

32. The stent deployment catheter as claimed in claim 31 wherein the hook-like elements project from a distal end of the plunger.

33. The stent deployment catheter as claimed in claim 30 wherein the engagement means comprises a tubular body having a distal surface.

34. The stent deployment catheter of claim 30, the stent engagement means comprises a coiled portion.