Pancreatic stent with drainage feature

• US 9,839,508 B2
• Filed: 10/08/2015
• Issued: 12/12/2017
• Est. Priority Date: 10/09/2014
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Walsh, Kevin, Trendel, Gary, Mannion, Paul
• Primary Examiner(s): Walters, Ryan J
• Application Number:
  US14/878,050
• Publication Number:
  US 20160100930A1
• Time in Patent Office: 796 Days
• CPC Class Codes: A61F 2/04 Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts A61F2/18, A61F2/20 take precedence; devices, other than stent-grafts, providing patency to, or preventing collapsing of, tubular structures of the body other than stent-grafts, e.g. stents A61F2/82; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/885 comprising a coil including a plurality of spiral or helical sections with alternate directions around a central axis
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2002/041 Bile ducts
• CPC Class Codes: A61F 2002/072 Encapsulated stents, e.g. wire or whole stent embedded in lining
• CPC Class Codes: A61F 2240/00 Manufacturing or designing of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
• CPC Class Codes: A61F 2240/001 Designing or manufacturing processes
• CPC Class Codes: A61F 2240/005 Templates
• 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 pancreatic stent includes a main body convertible between a compressed configuration for delivery and an expanded configuration once deployed, the main body including an inner surface defining a stent lumen and an outer surface. A plurality of drainage features are formed within the outer surface of the main body, the plurality of drainage features permitting placement of the pancreatic stent within a patient'"'"'s pancreas without blocking side branches of the pancreas.

Claims

1. A method of manufacturing an expandable medical stent including drainage features, the method comprising:

using a mandrel having a high-low pattern formed within an outer surface of the mandrel to braid an expandable metal support structure having a high-low pattern in at least some adjacent windings;

removing the expandable metal support structure from the mandrel; and

forming a polymeric layer over the expandable metal support structure;

wherein the polymeric layer conforms to the high-low pattern of the expandable metal support structure to form the drainage features.

2. The method of claim 1, wherein using a mandrel having a high-low pattern comprises using a mandrel having a herringbone pattern of channels including a first plurality of channels extending helically in a first direction and a second plurality of channels extending helically in a second direction.

3. The method of claim 1, wherein removing the expandable metal support structure from the mandrel comprises applying a compressive axial force to the expandable metal support structure to shorten its length and thus increase its diameter.

4. The method of claim 1, wherein the expandable metal support structure is braided from a wire formed of a shape memory material, and removing the expandable metal support structure from the mandrel comprises utilizing its shape memory properties to increase its diameter.

5. The method of claim 4, wherein the wire formed of a shape memory material comprises nitinol.

6. The method of claim 1, wherein forming a polymeric layer over the expandable metal support structure comprises stretching a polymeric sleeve over the expandable metal support structure.

7. The method of claim 6, wherein the polymeric layer comprises silicone.

8. The method of claim 1, wherein the drainage features extend helically around the expandable medical stent.

9. The method of claim 8, wherein each of the drainage features includes first and second helically extending peaks and a helically extending valley therebetween.

10. A method of manufacturing an expandable medical stent including drainage features, the method comprising:

braiding a plurality of wires around a mandrel to form an expandable metal support structure having a high-low pattern, the mandrel including a first plurality of channels extending helically in a first direction, a second plurality of channels extending helically in a second direction, and a plurality of high spots periodically interrupting one or more of the first plurality of channels and one or more of the second plurality of channels;

removing the expandable metal support structure from the mandrel; and

forming a polymeric layer over the expandable metal support structure;

wherein the polymeric layer conforms to the high-low pattern of the expandable metal support structure to form the drainage features.

11. The method of claim 10, wherein during braiding, one of the wires extending in the first direction rises up over one of the high spots.

12. The method of claim 11, wherein during braiding, one of the wires extending in the second direction rises up over one of the high spots.

13. The method of claim 10, wherein removing the expandable metal support structure comprises applying an axial compressive force to the expandable metal support structure.

14. The method of claim 10, wherein the drainage features extend helically around the expandable medical stent.

15. The method of claim 14, wherein each of the drainage features includes first and second helically extending peaks and a helically extending valley therebetween.