Stent delivery catheter

• US 7,887,574 B2
• Filed: 12/23/2003
• Issued: 02/15/2011
• Est. Priority Date: 12/23/2003
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: McFerran, Sean
• Primary Examiner(s): Nguyen; Anhtuan T
• Assistant Examiner(s): SONNETT, KATHLEEN C
• Application Number:
  US10/746,516
• Publication Number:
  US 20050149160A1
• Time in Patent Office: 2,611 Days
• Field of Search: 623/1.2, 623/1.1, 623 111- 154, 606/191, 606/192, 606/194, 606/99, 606/108, 606/200, 606/113, 606/114, 606/127, 606/128, 606195-199
• US Class Current: 623/1.11
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/9517 handle assemblies therefor
• CPC Class Codes: A61F 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod

Abstract

A self-expanding stent delivery assembly includes an elongate member with a proximal region and a distal region. The distal region has an outer tubular member. A self-expanding stent is disposed within the outer tubular member. Circumferential movement of at least a portion of the proximal region causes relative axial movement between the self-expanding stent and the outer tubular member, deploying the stent. Methods of deploying a self-expanding stent are also described.

Claims

1. A self-expanding stent delivery assembly comprising:

an elongate member having a proximal region and a distal region, the proximal region including a hub assembly, the distal region having an outer tubular member having an inner surface and a distal end, the elongate member further including an inner elongate member disposed within the outer tubular member, the inner elongate member having an outer surface;

wherein the inner elongate member is stationary relative to the hub assembly;

wherein the outer tubular member is configured to be rotatable about a longitudinal axis of the inner elongate member, wherein rotational movement of the outer tubular member causes the distal end of the outer tubular member to move axially in a proximal direction toward the hub assembly such that the distance between the distal end of the outer tubular member and the hub assembly is variable;

a first engagement member disposed along the inner surface of the outer tubular member;

a second engagement member disposed along the outer surface of the inner elongate member, the second engagement member extending from a distal end of the inner elongate member towards a proximal end of the inner elongate member, the first engagement member interacting with the second engagement member;

wherein at least one of the first and second engagement members comprises a helical element

a self-expanding stent being expandable from a compressed delivery configuration to an expanded deployed configuration, the self-expanding stent disposed within the outer tubular member and held in the compressed delivery configuration by engagement with the inner surface of the outer tubular member such that the outer tubular member restricts expansion of the self-expanding stent;

wherein a proximal end of the self-expanding stent abuts the distal end of the inner elongate member at the same position from where the second engagement member extends towards the proximal end of the inner elongate member;

wherein rotational movement of the outer tubular member causes axial movement of the distal end of the outer tubular member toward the hub assembly, deploying the stent out from the outer tubular member, whereby the self-expanding stent automatically reverts to the expanded deployed configuration upon deployment out from the outer tubular member.

2. The assembly according to claim 1, further comprising a layer of lubricious material disposed on the inner surface of the outer tubular member between the outer tubular member and the self-expanding stent.

3. The assembly according to claim 1, wherein the helical element comprises a helical projection extending out from the inner surface of the outer tubular member.

4. The assembly according to claim 1, wherein the helical element comprises a helical channel formed in the inner surface of the outer tubular member.

5. The assembly according to claim 4, wherein the helical element comprises a helical projection extending out from the outer surface of the inner elongate member.

6. The assembly according to claim 3, wherein the helical element comprises a helical channel formed in the outer surface of the inner elongate member.

7. The assembly according to claim 1, wherein the outer tubular member comprises PTFE.

8. A self-expanding stent delivery assembly comprising:

an elongate member having a proximal region and a distal region, the proximal region including a hub assembly, the distal region having an outer tubular member having a distal end, the elongate member further including an inner elongate member disposed within the outer tubular member;

wherein the inner elongate member is stationary relative to the hub assembly;

wherein the outer tubular member is configured to be rotatable about a longitudinal axis of the inner elongate member, wherein rotational movement of the outer tubular member causes the distal end of the outer tubular member to move axially in a proximal direction toward the hub assembly such that the distance between the distal end of the outer tubular member and the hub assembly is variable;

either a helical element disposed on at least a portion of the inner elongate member from a distal end of the inner elongate member towards a proximal end of the inner elongate member engaged with a helical element engagement member disposed on at least a portion of the outer tubular member; and

a self-expanding stent being expandable from a compressed delivery configuration to an expanded deployed configuration, the self-expanding stent disposed within the outer tubular member and held in the compressed delivery configuration by engagement with an inner surface of the outer tubular member such that the outer tubular member restricts expansion of the self-expanding stent;

wherein a proximal end of the self-expanding stent abuts the distal end of the inner elongate member at the same position from where the helical element of the inner elongate member extends towards the proximal end of the inner elongate member;

wherein rotational movement of the outer tubular member causes axial movement of the distal end of the outer tubular member toward the hub assembly, deploying the stent out from the outer tubular member, whereby the self-expanding stent automatically reverts to the expanded deployed configuration upon deployment out from the outer tubular member.

9. The assembly according to claim 8, wherein the outer tubular member comprises PTFE.