Stent delivery system with collapsible loading frame

• US 10,660,776 B2
• Filed: 04/10/2017
• Issued: 05/26/2020
• Est. Priority Date: 04/11/2016
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Inventors: Toner, Geraldine A., Folan, Martyn G., Connaughton, Enda, Nolan, Damien V., Montague, Matthew
• Primary Examiner(s): Schwiker, Katherine H
• Application Number:
  US15/483,514
• Publication Number:
  US 20170290692A1
• Time in Patent Office: 1,142 Days
• CPC Class Codes: A61F 2/97 the outer sleeve being splittable
• CPC Class Codes: A61F 2002/9528 for retrieval of stents
• CPC Class Codes: A61F 2002/9534 for repositioning of stents
• CPC Class Codes: A61F 2002/9665 with additional retaining means

Abstract

A stent delivery device including an elongate shaft having a proximal region, a distal region and at least one lumen extending therein. The stent delivery device also includes a collapsible frame attached to the distal region of the elongate shaft. The collapsible frame includes a plurality of arms configured to surround a stent such that the plurality of arms define a stent containment region. The stent delivery device also includes an inner member extending within a least a portion of the stent containment region and an actuation member configured to actuate the plurality of arms of the collapsible frame from an expanded configuration to a collapsed configuration.

Claims

1. A stent delivery device, comprising:

an elongate shaft including a proximal region, a distal region and at least one lumen extending therein;

a collapsible frame attached to the distal region of the elongate shaft, the collapsible frame including a plurality of arms configured to surround a stent such that the plurality of arms define a stent containment region;

an inner member extending through the stent containment region such that a distal tip of the inner member is positionable distal of a stent when contained therein; and

a pull wire configured to actuate the plurality of arms of the collapsible frame from an expanded configuration to a collapsed configuration;

wherein each of the plurality of arms includes a plurality of openings formed therein, the plurality of openings being longitudinally spaced apart along their respective arm;

wherein at least a portion of the pull wire extends helically around the inner member and through more than one of the plurality of openings formed in each arm of the plurality of arms.

2. The stent delivery device of claim 1, wherein the pull wire extends around the inner member in a substantially continuous configuration.

3. The stent delivery device of claim 1, wherein the collapsible frame further includes at least one aperture defined between one or more of the plurality of arms, wherein the aperture has a width, and wherein the aperture width decreases as the pull wire is actuated.

4. The stent delivery device of claim 1, wherein each of the plurality of arms includes a distal portion and a proximal portion, wherein each of the proximal portions includes a flexible region positioned distal to a distal end of the elongate shaft.

5. The stent delivery device of claim 4, wherein each of the flexible regions includes a flexible joint configured to maintain a substantially constant distance between the distal portion of its respective arm and the elongate shaft.

6. The stent delivery device of claim 1, further comprising a stent disposed within the stent containment region, wherein each of the plurality of arms extends an entire length of the stent.

7. The stent delivery device of claim 6, wherein the stent is positioned between an inner surface of each of the plurality of arms and an outer surface of the inner member.

8. The stent delivery device of claim 7, wherein the inner surface of each of the plurality of arms defines a concave surface with respect to the outer surface of the inner member, and wherein each of the concave surfaces are configured to mate with an outer surface of the stent.

9. The stent delivery device of claim 6, wherein the plurality of arms is configured to completely encircle the stent disposed within the stent containment region in the collapsed configuration.

10. The stent delivery device of claim 1, wherein the distal tip is configured to abut a distal end of each of the plurality of arms in the collapsed configuration.

11. A stent delivery system, comprising:

an elongate shaft including a proximal region, a distal region and at least one lumen extending therein;

a collapsible frame attached to the distal region of the elongate shaft, the collapsible frame including a plurality of arms, the plurality of arms collectively defining a stent containment region;

an inner member slidably disposed in the lumen of the elongate shaft and extending distally beyond the stent containment region, the inner member including a distal tip, wherein the inner member is configured to extend entirely through a length of a stent disposed within the stent containment region such that the distal tip is positioned distal of the stent when contained therein; and

a pull wire disposed along at least one of the plurality of arms;

wherein the plurality of arms are configured to surround a stent;

wherein the stent containment region has a first diameter corresponding to an expanded configuration and a second diameter corresponding to a collapsed configuration, and wherein actuation of the pull wire is designed to shift the stent containment region from the first diameter to the second diameter;

wherein each of the plurality of arms includes a proximal portion and a distal portion, each of the proximal portions including a flexible region positioned distal to a distal end of the elongate shaft, each of the distal portions extending from the flexible region to a distal end of its respective arm;

wherein the distal portion of each of the plurality of arms is oriented substantially parallel to a longitudinal axis of the elongate shaft in the collapsed configuration and in the expanded configuration;

wherein each of the plurality of arms includes a plurality of passages extending circumferentially therethrough;

wherein at least a portion of the pull wire extends helically around the inner member and through more than one of the plurality of passages extending circumferentially through each arm of the plurality of arms.

12. The stent delivery device of claim 11, wherein the pull wire extends around the inner member in a substantially continuous configuration.

13. The stent delivery device of claim 11, further comprising a stent disposed within the stent containment region.

14. The stent delivery device of claim 11, wherein an inner surface of each of the plurality of arms defines a circumferentially concave surface with respect to an outer surface of the inner member.

15. A stent delivery device, comprising:

a stent;

an elongate shaft including a proximal region, a distal region and at least one lumen extending therein;

a collapsible frame attached to the distal region of the elongate shaft, the collapsible frame including a plurality of arms surrounding the stent such that the plurality of arms define a stent containment region, each of the plurality of arms extending distally beyond a distal end of the stent;

an inner member slidably disposed in the lumen of the elongate shaft, the inner member extending through the stent such that a distal tip of the inner member is positioned distal of the distal end of the stent; and

a pull wire configured to actuate the plurality of arms of the collapsible frame from an expanded configuration to a collapsed configuration to radially constrain the stent in the stent containment region such that none of the stent extends outside of the stent containment region in the collapsed configuration;

wherein each of the plurality of arms includes a plurality of openings extending circumferentially therethrough, the plurality of openings being longitudinally spaced apart along their respective arm;

wherein at least a portion of the pull wire extends through each of the plurality of openings extending circumferentially through each arm of the plurality of arms.

16. The stent delivery device of claim 15, wherein the pull wire extends helically around the inner member in a substantially continuous configuration.

17. The stent delivery device of claim 15, wherein in the collapsed configuration, each of the plurality of arms abuts circumferentially adjacent arms and the distal tip abuts a distal end of each of the plurality of arms.