IMPLANTABLE MEDICAL DEVICE WITH REDUCED MIGRATION CAPABILITIES

• US 20170290653A1
• Filed: 04/10/2017
• Published: 10/12/2017
• Est. Priority Date: 04/11/2016
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Folan, Martyn G., Keating, Thomas M.
• Granted Patent: US 10,426,592 B2
• Time in Patent Office: 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 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2002/9528 for retrieval of stents
• CPC Class Codes: A61F 2210/0076 multilayered, e.g. laminated structures
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2220/0075 sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2250/0023 differing in porosity
• CPC Class Codes: A61F 2250/0051 differing in tissue ingrowth capacity, e.g. made from both ingrowth-promoting and ingrowth-preventing parts
• CPC Class Codes: A61F 2250/0059 temporary
• CPC Class Codes: A61F 2250/0096 Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers

Abstract

Medical devices and methods for making and using a medical device are disclosed. An example medical device may include a stent that comprises a first covered region formed of one or more interwoven filaments and a covering. The stent may also comprise a second uncovered region adjacent the first covered region. The second uncovered region may include a knitted filament. A first end of the knitted filament may be attached to the first covered region. The knitted filament is configured to be unraveled to remove both the first covered region and the second uncovered region of the stent while the first end of the knitted stent remains attached to the first covered region.

Claims

1. A stent comprising:

a first covered region formed of one or more interwoven filaments and a covering; and

a second uncovered region adjacent the first covered region, wherein the second uncovered region includes a knitted filament;

wherein a first end of the knitted filament is attached to the first covered region;

wherein the knitted filament is configured to be unraveled to remove both the first covered region and the second uncovered region of the stent while the first end of the knitted stent remains attached to the first covered region.

2. The stent of claim 1, wherein the one or more interwoven filaments of the first covered region include a plurality of braided filaments.

3. The stent of claim 1, wherein the one or more interwoven filaments of the first covered region include a knitted filament.

4. The stent of claim 3, wherein the knitted filament of the second uncovered region and the knitted filament of the first covered region comprise a single knitted filament.

5. The stent of claim 1, wherein the first end of the knitted filament is attached to the first covered region at a first attachment point.

6. The stent of claim 5, wherein the first weld point is configured to terminate the unraveling of the knitted filament beyond the first attachment point.

7. The stent of claim 1, wherein the knitted filament of the second region includes a second end, and wherein the second end is attached to an intermediate portion of the knitted filament at a second attachment point.

8. The stent of claim 7, wherein the second weld point is configured to separate from the intermediate portion of the knitted filament.

9. The stent of claim 8, wherein separating the attachment point from the intermediate portion of the knitted filament permits the unraveling of the second uncovered region of the stent.

10. The stent of claim 1, wherein the second uncovered region of the stent is configured to permit tissue ingrowth therein so as to reduce migration of the stent.

11. The stent of claim 1, wherein the first covered region is configured to prevent tissue ingrowth along the first covered region of the stent.

12. The stent of claim 1, wherein the first covered region, the second uncovered region, or both have a flared end portion.

13. The stent of claim 1, wherein a portion of the knitted filament extends through a plurality of interstices defined between adjacent filaments of the one or more interwoven filaments of the first covered region, and wherein the first end of the knitted filament includes a slip knot.

14. The stent of claim 13, wherein unraveling the knitted filament causes the slip knot to tighten around the end of the first covered region, and wherein the end of the first covered region collapses radially inward upon tightening of the slip knot.

15. A stent, comprising:

a tubular member having a first end and a second end and a lumen extending therein;

a first covered portion disposed along the first end of the tubular member, the first covered portion including one or more interwoven filaments;

a second uncovered portion disposed along the second end of the tubular member;

the second uncovered portion adjacent to and attached to the first covered portion;

wherein the first covered portion is configured to prevent tissue ingrowth along the first covered portion;

wherein the second uncovered portion is configured to permit tissue ingrowth therein so as to reduce migration of the stent; and

wherein the second uncovered portion includes a knitted filament configured to be unraveled to remove both the first covered portion and the second uncovered portion of the stent while the second uncovered portion remains attached to the first covered portion.

16. The stent of claim 15, wherein the one or more interwoven filaments of the first covered portion includes a plurality of braided filaments.

17. The stent of claim 15, wherein the one or more interwoven filaments of the first covered portion and the knitted filament of the second uncovered portion form a single knitted filament.

18. The stent of claim 15, wherein the knitted filament of the second uncovered portion is attached to the first covered portion at an attachment point.

19. A method for removing an implantable medical device, the method comprising:

engaging a free end of a knitted filament with a removal device, the knitted filament defining a portion of a stent, the stent being positioned within a body lumen;

wherein the stent includes;

a first covered portion;

a second uncovered portion positioned adjacent to and attached to the first covered portion, wherein the second uncovered portion includes the knitted filament;

proximally retracting the free end of the knitted filament to unravel the second uncovered portion while the first covered portion remains attached to the second uncovered portion; and

further proximally retracting the unraveled knitted filament to remove the covered portion from the body lumen.

20. The method of claim 19, wherein proximally retracting the free end of the knitted filament to unravel the second uncovered portion while the first covered portion remains attached to the second uncovered portion further includes retracting the removal device through the lumen of the stent and away from the knitted portion such that the stent inverts on itself.