Attachment mechanism for stent release

• US 8,876,878 B2
• Filed: 07/23/2010
• Issued: 11/04/2014
• Est. Priority Date: 07/23/2010
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Dwork, Joshua, Yeung, Hubert, Shipley, Adam
• Primary Examiner(s): Prone, Christopher D
• Application Number:
  US12/842,496
• Publication Number:
  US 20120022628A1
• Time in Patent Office: 1,565 Days
• Field of Search: 623 111- 112, 623/2.11, 623/2.36, 606/108, 606191-194, 606/198
• 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 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
• 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 2002/9665 with additional retaining means

Abstract

An attachment mechanism for coupling a stent to a delivery system is disclosed. The attachment mechanism is configured to pivot relative to an inner shaft assembly of the delivery system in order to release the stent from the delivery system.

Claims

1. A delivery system for percutaneously deploying a stent, the system comprising:

an inner shaft assembly including a support tube supporting the stent;

an attachment mechanism coupled to the inner shaft assembly and configured to selectively engage the stent, the attachment mechanism including a casing, a lug positioned within the casing and an axle coupling the casing to the lug, wherein the lug further includes fingers extending therefrom to engage the stent and defines an elongated slot surrounding the support tube to define a range of rotation for the lug about the support tube;

a delivery sheath capsule slidably disposed over the inner shaft assembly and configured to compressively contain the stent engaged with the attachment mechanism;

wherein the lug is adapted to pivot about the axle relative to the inner shaft assembly as the delivery sheath capsule is retracted.

2. The delivery system of claim 1, wherein the lug includes two fingers configured to engage the stent.

3. The delivery system of claim 1, wherein a portion of the stent is positioned between the lug and the delivery sheath capsule.

4. An attachment mechanism for use in a delivery system including an inner shaft assembly and a delivery sheath capsule slidably disposed over the inner shaft assembly, the attachment mechanism comprising:

a casing positioned around a support tube of the inner shaft assembly;

an axle coupled to the casing and including an aperture positioned around the support tube; and

a lug pivotable with respect to the axle and the casing, the lug including fingers defining recessed portions positioned on opposite sides of the lug and adapted to engage a stent.

5. The attachment mechanism of claim 4, wherein the casing includes a fastening element configured to engage the inner shaft assembly.

6. The attachment mechanism of claim 4, wherein the casing includes a cavity and further wherein the lug is positioned within the cavity.

7. The attachment mechanism of claim 4, wherein the lug includes an elliptically shaped slot adapted to accommodate the support tube of the delivery system therein.