Mechanism to improve stent securement

• US 20040236406A1
• Filed: 05/20/2003
• Published: 11/25/2004
• Est. Priority Date: 05/20/2003
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Gregorich, Daniel
• Granted Patent: US 7,235,093 B2
• Time in Patent Office: Days
• US Class Current: 623/1.16
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/30428 made by inserting a protrusion into a slot
• CPC Class Codes: A61F 2002/828 Means for connecting a plurality of stents allowing flexibility of the whole structure
• CPC Class Codes: A61F 2002/91525 within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2002/91591 Locking connectors, e.g. using male-female connections
• 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 2002/9583 Means for holding the stent on the balloon, e.g. using protrusions, adhesives or an outer sleeve
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0054 V-shaped

Abstract

The present invention comprises a securement member to improve securement of a stent upon an expandable balloon and delivery catheter, and to constrain portions of the stent before and during stent deployment. Generally, the securement member comprises a securement connector arranged to engage a catheter, at least one flexible connecting member coupled to the securement connector, and a locking member arranged to engage a portion of a stent.

Claims

2. The device of claim 1, further comprising a plurality of flexible connecting members.

3. The device of claim 2, wherein said flexible connecting members are arranged to expand with the stent.

4. The device of claim 2, wherein the circumferential band is a serpentine band.

10. A stent delivery system comprising:

a catheter;

an expandable balloon;

a radially expandable stent having at least one engagable portion;

at least one radially expandable constrainment member having a first end coupled to said catheter and a second end having at least one engaging portion;

wherein said constrainment member engaging portion and said stent engagable portion are engaged;

and wherein said constrainment member engaging portion and said stent engagable portion may remain engaged throughout the expansion of said balloon.

1. A device for preventing stent movement during delivery comprising:

a securement connector arranged to engage a catheter;

at least one flexible connecting member made from a shape memory material, said flexible connecting member having a first end portion and a second end portion, the first end portion coupled to said securement connector; and

a locking member located at said flexible connecting member second end portion arranged to engage a portion of a stent.

5. The device of claim 1, wherein the flexible connecting member is balloon expandable.

6. The device of claim 5, wherein the shape memory material has an Af temperature lower than normal human body temperature.

7. In combination, the device of claim 1 and a catheter, the catheter having a balloon with a stent disposed thereabout, the stent engaged to the device.

8. The combination of claim 7 wherein the stent includes an engagable portion arranged to engage said locking member.

9. The combination of claim 8 wherein the device is made of a shape memory material which is balloon expandable and which is programmed to return to an unexpanded diameter following balloon expansion.

11. The stent delivery system of claim 10, wherein said constrainment member engaging portion and said stent engagable portion are constructed and arranged to remain engaged until said balloon is deflated.

12. The stent delivery system of claim 11, wherein said constrainment member is made from a shape memory material.

13. The stent delivery system of claim 12 wherein the constrainment member is programmed to return to a reduced diameter configuration following balloon expansion.

14. The stent delivery system of claim 13 wherein the constrainment is in the form of serpentine shaped band.

14-1. The stent delivery system of claim 10 wherein said constrainment member engaging portion and said stent engagable portion are in the form of a ball and socket.

15. The stent delivery system of claim 10 wherein the constrainment is in the form of serpentine shaped band.

16. The stent delivery system of claim 15, wherein when said constrainment member engaging portion and said stent engagable portion are engaged, said stent engagable portion is further constrained from rotation about the catheter.

17. The stent delivery system of claim 15, wherein when said constrainment member engaging portion and said stent engagable portion are engaged, said stent engagable portion is free to move in the direction of radial expansion.

15-2. A stent delivery system comprising:

a catheter;

an expandable balloon;

a radially expandable stent arranged about said expandable balloon in an unexpanded state, said stent having an end portion, said end portion having at least one engagable portion;

at least one radially expandable constrainment member arranged to partially overlay said balloon, said constrainment member having a first end coupled to said catheter and comprising a circumferential band having a plurality of openings therethrough and an engaging portion;

wherein said constrainment member engaging portion is arranged to engage said stent engagable portion;

and wherein when said constrainment member engaging portion and said stent engagable portion are engaged, movement of said stent engagable portion in the axial direction is prevented.