Delivery system having stent retention structure

• US 9,649,213 B2
• Filed: 07/14/2014
• Issued: 05/16/2017
• Est. Priority Date: 06/23/2010
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Hollett, Andrew K., Graham, Jacob A., Amos, Michael D., Leanna, Gary J., Griego, John A., Lane, John
• Primary Examiner(s): MILES, JONATHAN WADE
• Application Number:
  US14/330,783
• Publication Number:
  US 20140324152A1
• Time in Patent Office: 1,037 Days
• CPC Class Codes: A61F 2/042 Urinary bladders
• 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
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61M 2025/0096 being laterally outward extensions or tools, e.g. hooks or fibres
• CPC Class Codes: A61M 25/0082 Catheter tip comprising a tool
• CPC Class Codes: A61M 25/01 Introducing, guiding, advancing, emplacing or holding catheters A61M25/10 takes precedence
• CPC Class Codes: A61M 25/0102 Insertion or introduction using an inner stiffening member, e.g. stylet or push-rod
• CPC Class Codes: A61M 27/002 Implant devices for drainage of body fluids from one part of the body to another intraocular A61F9/00781; middle ear A61F11/202

Abstract

A drainage stent delivery system including an elongate shaft of a medical device, a drainage catheter or stent, and an interference fit member for selectively coupling the drainage stent to the elongate shaft. The drainage stent is selectively coupled to a distal portion of the elongate shaft by an interference fit between the interference fit member and the drainage stent such that axial movement of the elongate shaft relative to the drainage stent moves the interference fit member from a first position in which the interference fit member is engaged with the drainage stent and forms an interference fit with the drainage stent to a second position in which the interference fit member is disengaged from the drainage stent.

Claims

1. A drainage stent delivery system comprising:

a drainage stent including a generally non-expandable tubular member having a proximal end, a distal end and a central longitudinal axis;

an elongate shaft extending distally from a handle assembly to a location distal of the proximal end of the drainage stent, the elongate shaft including a portion configured to form an interference fit with the drainage stent; and

an inner elongate member extending through the lumen of the elongate shaft, wherein the inner elongate member includes a projection that forms an interference fit with an inner surface of the proximal end of the drainage stent;

wherein the portion of the elongate shaft configured to form an interference fit with the drainage stent is in contact with an exterior surface of the drainage stent;

wherein the drainage stent is longitudinally moveable relative to the elongate shaft to effect disengagement of the drainage stent from the portion of the elongate shaft configured to form an interference fit with the drainage stent.

2. The drainage stent delivery system of claim 1, wherein the portion of the elongate shaft configured to form an interference fit with the drainage stent surrounds and is press fit onto the exterior surface of the drainage stent.

3. The drainage stent delivery system of claim 1, wherein the elongate shaft includes a lumen extending therethrough, wherein the proximal end of the drainage stent is inserted into the lumen of the elongate shaft.

4. The drainage stent delivery system of claim 1, wherein the inner elongate member is longitudinally moveable relative to the elongate shaft.

5. The drainage stent delivery system of claim 4, wherein longitudinal movement of the inner elongate member relative to the elongate shaft effects disengagement of the drainage stent from the elongate shaft.

6. The drainage stent delivery system of claim 1, wherein a portion of the inner elongate member extends through the drainage stent.

7. The drainage stent delivery system of claim 1, wherein an outer diameter of the drainage stent is sized relative to an inner diameter of the elongate shaft such that an axial force of less than 2 pounds applied to the elongate shaft is insufficient to disengage the drainage stent from the portion of the elongate shaft configured to form an interference fit with the drainage stent.

8. A drainage stent delivery system comprising:

a handle assembly;

a push catheter extending distally from the handle assembly, the push catheter having a lumen extending therethrough;

a guide catheter positioned in the lumen of the push catheter, the guide catheter being longitudinally actuatable relative to the push catheter; and

a drainage stent including a generally non-expandable tubular member having a proximal end, a distal end and a lumen extending therethrough along a central longitudinal axis;

wherein a proximal end region of the drainage stent extends into the lumen of the push catheter to form an interference fit with the push catheter;

wherein the guide catheter includes a projection that forms an interference fit with an inner surface of a proximal end of the drainage stent;

wherein the guide catheter is longitudinally moveable relative to the push catheter to effect disengagement of the drainage stent from the push catheter.

9. The drainage stent delivery system of claim 8, wherein the guide catheter extends into the lumen of the drainage stent.

10. The drainage stent delivery system of claim 9, wherein the guide catheter extends distally beyond the distal end of the drainage stent.

11. The drainage stent delivery system of claim 8, wherein the projection of the guide catheter is configured to expel the drainage stent from the lumen of the push catheter.

12. The drainage stent delivery system of claim 8, wherein the projection is an annular rim.

13. The drainage stent delivery system of claim 8, wherein a portion of the guide catheter extends distal of the projection.

14. The drainage stent delivery system of claim 13, wherein the portion of the guide catheter extending distal of the projection extends through the lumen of the drainage stent.

15. The drainage stent delivery system of claim 8, wherein the handle assembly includes an actuator configured to longitudinally actuate the guide catheter relative to the push catheter.

16. The drainage stent delivery system of claim 8, wherein an outer diameter of the drainage stent is sized relative to an inner diameter of the push catheter such that an axial force of less than 2 pounds applied to the drainage stent by the guide catheter is insufficient to disengage the drainage stent from push catheter.