STENT DELIVERY DEVICE WITH ROLLING STENT RETAINING SHEATH

• US 20100168835A1
• Filed: 12/31/2009
• Published: 07/01/2010
• Est. Priority Date: 12/31/2008
• Status: Active Grant

• Current Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Original Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Inventors: Dorn, Jurgen
• Granted Patent: US 10,271,979 B2
• Time in Patent Office: Days
• US Class Current: 623/1.110
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/9522 Means for mounting a stent or stent-graft onto or into a placement instrument
• CPC Class Codes: A61F 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod

Abstract

A delivery device for delivering a stent device that is expandable from a radially reduced, delivery configuration to a radially expanded, deployed configuration. A retaining sheath is disposed over the stent device for maintaining the stent device in the delivery configuration. A pull line to be pulled upon is provided to retract the retaining sheath in a rolling manner such that the retaining sheath is folded back on itself to provide a radially inner sheath of the retaining sheath, a radially outer sheath of the retaining sheath and a fold portion therebetween. The retaining sheath may be made of a cold drawn plastic at least along the path of travel of the fold portion in retracting the retaining sheath from over the stent device.

Claims

1. A delivery device, comprising:

a stent device that is expandable from a radially reduced, delivery configuration to a radially expanded, deployed configuration;

a retaining sheath disposed over the stent device for maintaining the stent device in the delivery configuration;

a pull member to be pulled upon to retract the retaining sheath in such a manner that the retaining sheath is folded back on itself to provide a radially inner sheath of the retaining sheath, a radially outer sheath of the retaining sheath and a fold portion therebetween, wherein the pull member is moveable by pulling thereon to move the outer sheath over the inner sheath and thus to move the fold portion axially relative to the stent device to retract the retaining sheath from over the stent device to release the stent device for expansion to the deployed configuration, wherein

the retaining sheath is made of a cold drawn plastic at least along the path of travel of the fold portion in retracting the retaining sheath from over the stent device.

2. A delivery device, comprising:

a stent device that is expandable from a radially reduced, delivery configuration to a radially expanded, deployed configuration;

a retaining sheath disposed over the stent device for maintaining the stent device in the delivery configuration;

a pull member to be pulled upon to retract the retaining sheath in such a manner that the retaining sheath is folded back on itself to provide a radially inner sheath of the retaining sheath, a radially outer sheath of the retaining sheath and a fold portion therebetween, wherein the pull member is moveable by pulling thereon to move the outer sheath over the inner sheath and thus to move the fold portion axially relative to the stent device to retract the retaining sheath from over the stent device to release the stent device for expansion to the deployed configuration, wherein the pull member is a pull line, and wherein

the pull line extends axially along the stent device and joins the retaining sheath substantially at or beyond an axial end of the stent device in a pre-retracted configuration of the retaining sheath.

3. The delivery device of claim 2, wherein the pull line is formed integrally with the retaining sheath

4. The delivery device of claim 2, wherein the pull line is made of a different material to the retaining sheath and is attached to the retaining sheath.

5. The delivery device of claim 4, wherein the pull line is radially thinner than a wall of the retaining sheath.

6. The delivery device of claim 4, wherein an extension strip of retaining sheath material extends beyond and end of the outer sheath and the pull line is attached to the extension strip.

7. The delivery device of claim 4, wherein the pull line is a plastic thread.

8. The delivery device of claim 2, wherein the retaining sheath is made of a cold drawn plastic at least along the path of travel of the fold portion in retracting the retaining sheath from over the stent device.

9. The delivery device of claim 8, wherein the cold drawn plastic is polyethylene terephthalate (PET).

10. The delivery device of claim 2, wherein the retaining sheath is, in a pre-retracted configuration of the retaining sheath, folded back upon itself to define an outer sheath, an inner sheath and a fold portion therebetween.

11. The delivery device of claim 2, wherein the stent device is mounted on a supporting inner member.

12. The delivery device of claim 11, wherein the inner sheath of the retaining sheath is attached to the inner member at a position proximal of the stent device.

13. The delivery device of claim 2, wherein the pull member joins with the outer sheath of the retaining sheath.

14. The delivery device of claim 2, wherein the delivery device has a distal tip member.

15. The delivery device of claim 14, wherein the distal tip member includes a radial recess and the fold portion of the retaining sheath is positioned axially within the recess.

16. The delivery device of claim 15, wherein the outer sheath of the retaining sheath ends axially within the recess.

17. The delivery device of claim 2, wherein the pull member comprises a radially thicker portion and a radially thinner portion and a coupler therebetween for coupling the portions and the thicker portion provides a pull end of the pull member and the thinner portion extends axially along the stent device.

18. The delivery device of claim 17, wherein the coupler is a coupling ring mounted about the inner member and axially moveable relative thereto.

19. The delivery device of claim 18, comprising an introducer member from which the retainer sheath distally extends, wherein the pull member extends through the introducer member so that the retainer sheath is pulled axially into the introducer member.

20. The delivery device of claim 19, wherein the coupler is positioned axially within the introducer member.