Dilatation and stent delivery system and related methods

• US 7,947,070 B2
• Filed: 05/16/2003
• Issued: 05/24/2011
• Est. Priority Date: 05/16/2003
• Status: Expired due to Fees

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Inventors: Shank, Peter, Abi-Kheirs, Michael, Headley, F. Anthony, Rusk, Emily, Damarati, John
• Primary Examiner(s): Bui; Vy Q.
• Application Number:
  US10/439,298
• Publication Number:
  US 20040230284A1
• Time in Patent Office: 2,930 Days
• Field of Search: 606/108, 606/191, 606/194, 606/195, 606/198, 623/1.11
• 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 2/958 Inflatable balloons for placing stents or stent-grafts

Abstract

The invention relates to a system for dilatation of a body passage and delivery of a stent into the body passage of a patient, and related methods of using such a system. The dilatation and stent delivery system may comprise a dilatation catheter having an expandable member on a distal end, and a stent delivery catheter configured to retain a stent and deliver the stent to a body passage. The stent delivery catheter defines a lumen sized to receive the dilatation catheter and permit movement of the dilatation catheter relative to the stent delivery catheter.

Claims

1. A dilatation and stent delivery system, the system comprising:

a dilatation catheter, the dilatation catheter having an expandable member; and

a stent delivery catheter, the stent delivery catheter comprising;

an inner shaft, the inner shaft comprising a stent retaining region, the inner shaft defining a lumen sized to receive the dilatation catheter and to permit movement of the dilatation catheter relative to the stent delivery catheter,

an outer sheath, the outer sheath having a non-retracted state and a retracted state, the outer sheath comprising a distal end, the distal end of sheath being disposed over the stent retaining region of the inner shaft when the outer sheath is in the non-retracted state, the distal end of the outer sheath being proximal to the stent retaining region when the outer sheath is in the retracted state.

2. The system of claim 1, wherein the stent delivery catheter includes a locking mechanism at a proximal end for selectively restricting movement of at least a portion of the stent delivery catheter relative to the dilatation catheter.

3. The system of claim 1, wherein the stent delivery catheter further includes a locking mechanism fixed to a proximal end of the inner shaft for selectively restricting movement of the inner shaft relative to the dilatation catheter.

4. The system of claim 3, wherein the locking mechanism is configured to selectively engage the dilatation catheter.

5. The system of claim 3, further comprising a handle at a proximal end of the inner shaft, wherein the locking mechanism is attached to a proximal end of the handle.

6. The system of claim 5, wherein the inner shaft terminates in the handle, and the locking mechanism defines a lumen to receive the dilatation catheter.

7. The system of claim 3, the stent delivery catheter further comprising a stent holder configured to retain a stent on the stent retaining region of the inner shaft.

8. The system of claim 3, further comprising a first handle at a proximal end of the outer sheath and a second handle at the proximal end of the inner shaft.

9. The system of claim 1, wherein the expandable member is a balloon.

10. The system of claim 9, wherein the balloon expands to a plurality of distinct diameters corresponding to known inflation pressures.

11. The system of claim 1, wherein the dilatation catheter defines an inflation lumen for passing inflation fluid to the expandable member and a guide wire lumen for accommodating a guide wire.

12. The system of claim 1, wherein a length of the dilatation catheter is greater than a length of the stent delivery catheter.

13. The system of claim 1, wherein the dilatation catheter includes a distal tip a portion of which has a cross-sectional size at least as large as a cross-sectional size of the outer sheath.

14. The system of claim 1, further comprising a second expandable member at a distal end of the dilatation and stent delivery system.

15. The system of claim 14, wherein the second expandable member is located on a distal end of the stent delivery catheter.

16. The system of claim 14, wherein the second expandable member is located on the distal end of the dilatation catheter.

17. The system of claim 14, wherein the expandable member of the dilatation catheter expands to a first diameter, the second expandable member expands to a second diameter, and the second diameter is larger than the first diameter.

18. The system of claim 1, wherein the stent delivery catheter further comprises a stent holder configured to retain a stent on the stent retaining region of the inner shaft.

19. The system of claim 1, further comprising a stent disposed about the stent retaining region of the inner shaft.

20. The system of claim 1, wherein a distal end of the inner shaft is not fixedly coupled to the outer sheath.

21. The system of claim 1, wherein the inner shaft is extendable from and retractable into a distal end of the lumen of the outer sheath.

22. The system of claim 21, wherein the stent delivery catheter further includes a distal tip, the distal tip including a reduced diameter proximal portion for receiving a distal portion of the outer sheath and thereby acting as a seat when the outer sheath is in its distal most position relative to the inner shaft.

23. The system of claim 1, wherein the expandable member is capable of expanding to a plurality of distinct maximum diameters corresponding to known inflation pressures.

24. The system of claim 1, wherein the inner shaft is configured to slide along an inner surface of the outer sheath.

25. In combination, a stent and a dilatation and stent delivery system, the combination comprising:

a stent;

a dilatation catheter, the dilatation catheter having a balloon; and

a stent delivery catheter, the stent delivery catheter comprising;

an inner shaft, the inner shaft comprising a stent retaining region, the stent disposed about the stent retaining region; and

a tip, the tip being tubular and engaged to a distal end of the inner shaft;

the inner shaft and tip defining a lumen sized to receive the dilatation catheter and permit movement of the dilatation catheter relative to the stent delivery catheter.

26. The combination of claim 25, wherein the stent is a self-expanding stent.

27. The combination of claim 25, wherein the stent delivery catheter further comprises a sheath, the sheath having a non-retracted state and a retracted state, the sheath comprising a distal end, the distal end of the sheath being disposed on a proximal end of the tip and over the stent when the sheath is in the non-retracted state, and the distal end of the sheath being proximal to the stent retaining region when the sheath is in the retracted state.