DELIVERY SYSTEM HAVING STENT LOCKING STRUCTURE

• US 20110077622A1
• Filed: 09/17/2010
• Published: 03/31/2011
• Est. Priority Date: 09/25/2009
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Inventors: Hollett, Andrew, Amos, Michael Devon, Weisman, Michal
• Granted Patent: US 8,753,303 B2
• Time in Patent Office: Days
• US Class Current: 604/544
• CPC Class Codes: A61F 2/848 having means for fixation to the vessel wall, e.g. barbs
• CPC Class Codes: A61F 2/94 Stents retaining their form, i.e. not being deformable, after placement in the predetermined place
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• 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 2002/041 Bile ducts
• CPC Class Codes: A61F 2002/8483 Barbs
• CPC Class Codes: A61F 2002/9505 having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument

Abstract

A drainage stent delivery system including an elongate shaft of a medial device, a drainage catheter or stent, and a locking mechanism for selectively coupling the drainage stent to the elongate shaft. The drainage stent is selectively coupled to a distal portion of the elongate shaft such that the proximal end of the stent is positioned proximal of the distal end of the elongate shaft. The locking mechanism includes an engaging feature of the elongate shaft which engages a portion of the stent such that the stent may be selectively coupled to the elongate shaft through rotational motion of the elongate shaft relative to the stent. In some instances, the engaging feature of the elongate shaft may be a tab which extends into an opening of the stent.

Claims

1. A stent delivery system comprising:

an elongate shaft of a medical device, the elongate shaft having a proximal end and a distal end;

a stent having a proximal end and a distal end, the stent being selectively coupled to a distal portion of the elongate shaft such that the proximal end of the stent is positioned proximal of the distal end of the elongate shaft; and

a locking mechanism for selectively coupling the stent to the elongate shaft through rotational motion of the elongate shaft relative to the stent, wherein the locking mechanism includes an engaging feature of the elongate shaft which engages a portion of the stent.

2. The stent delivery system of claim 1, wherein the engaging feature is a tab configured to be inserted into an opening of the stent.

3. The stent delivery system of claim 2, wherein the opening is a generally V-shaped slot.

4. The stent delivery system of claim 2, wherein the opening is a generally L-shaped slot.

5. The stent delivery system of claim 2, wherein the stent includes an outwardly extending barb and the opening extends through a sidewall of the stent proximate the barb.

6. The stent delivery system of claim 2, wherein the tab is an arcuate flap.

7. The stent delivery system of claim 2, wherein the tab is a radially extending protrusion.

8. The stent delivery system of claim 1, wherein the elongate shaft includes an inner tubular member and an outer tubular member which is longitudinally actuatable relative to the inner tubular member, a distal portion of the inner tubular member extending distally into the stent and a distal end of the outer tubular member positioned proximal of the proximal end of the stent.

9. A drainage stent delivery system comprising:

a drainage stent including a tubular member having a proximal end and a distal end; and

an elongate shaft extending distally from a handle assembly to a location distal of the proximal end of the drainage stent, a distal portion of the elongate shaft including a tab, the tab being configured for engagement with the drainage stent through rotational motion of the elongate shaft relative to the drainage stent to selectively couple the drainage stent to the elongate shaft.

10. The drainage stent delivery system of claim 9, wherein the tab of the elongate shaft is an arcuate flap.

11. The drainage stent delivery system of claim 10, wherein the arcuate flap extends in a circumferential direction relative to a central longitudinal axis of the elongate shaft.

12. The drainage stent delivery system of claim 9, wherein the tab of the elongate shaft is a radially extending protrusion.

13. The drainage stent delivery system of claim 9, wherein the stent includes a slot formed in a sidewall of the drainage stent proximate the proximal end of the drainage stent configured for engagement with the tab of the elongate shaft.

14. The drainage stent delivery system of claim 13, wherein the slot is open to the proximal end of the drainage stent.

15. The drainage stent delivery system of claim 14, wherein the elongate shaft includes an inner tubular member and an outer tubular member disposed about the inner tubular member, the outer tubular member being longitudinally actuatable relative to the inner tubular member.

16. The drainage stent delivery system of claim 15, wherein the inner tubular member extends into the drainage stent and the outer tubular member has a distal end positioned proximal of the proximal end of the drainage stent, the distal end of the outer tubular member engaging the proximal end of the drainage stent to retain the tab in the slot.

17. A method of selectively engaging a stent to an elongate shaft of a medical device, the method comprising:

positioning a stent relative to an elongate shaft of a medical device such that a distal end of the elongate shaft is distal of a proximal end of the stent; and

rotating the stent relative to the elongate shaft such that a tab of the elongate shaft extends into an opening of the stent.

18. The method of claim 17, wherein during the positioning step, a distal portion of the elongate shaft is inserted into the stent.

19. The method of claim 17, wherein during the positioning step, a distal portion of the elongate shaft is disposed around the stent.

20. The method of claim 17, wherein after rotating the stent relative to the elongate shaft, an outer tubular member of the elongate shaft is actuated distally relative to an inner tubular member of the elongate shaft.