STENT DEVICE ADHESIVELY BONDED TO A STENT DEVICE PUSHER

• US 20100070016A1
• Filed: 09/15/2009
• Published: 03/18/2010
• Est. Priority Date: 09/16/2008
• Status: Abandoned Application

• Current Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Original Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Inventors: Dorn, Juergen, Walter, Beate, Hoffman, Martina
• Application Number:
  US12/560,295
• Publication Number:
  US 20100070016A1
• 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 2/966 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 2002/9583 Means for holding the stent on the balloon, e.g. using protrusions, adhesives or an outer sleeve
• CPC Class Codes: A61F 2002/9665 with additional retaining means

Abstract

A stent device delivery system, comprising a stent device pusher, a radially expandable stent device and an outer sheath. A tacky material provides a tackiness between the stent device pusher and an inner surface of the stent device. The tacky material is distributed along the length of the stent device. The tacky material serves to resist axial movement of the stent device relative to the stent device pusher as the outer sheath slides axially over the stent device, yet allows the stent device to peel from the tacky material and expand to a radially expanded state as the outer sheath slides axially over the stent device to release the stent device. The tacky material may be compressible such that the stent device is embedded in the compressible tacky material.

Claims

1. A stent device delivery system, comprising

a stent device pusher comprising protrusions with axially extending spaces therebetween;

a radially self-expandable stent device comprising a lumen extending longitudinally therethrough;

an outer sheath, the stent device being constrained in a radially contracted state by the outer sheath so that the protrusions of the stent pusher engage an inner surface of the stent device at positions axially distributed along the stent device; and

a tacky material axially distributed along the stent device and providing a tackiness between the stent device pusher and the inner surface of the stent device, wherein the tackiness and the engagement of the protrusions with the inner surface of the stent device serve to resist axial movement of the stent device relative to the stent device pusher as the outer sheath slides axially over the stent device and the tacky material is such that it allows the stent device to peel from the tacky material and expand to a radially expanded state as the outer sheath slides axially over the stent device to release the stent device.

2. The stent device delivery system according to claim 1, wherein the tacky material is uniformly distributed along and about the inner surface of the stent device.

3. The stent device delivery system according to claim 1, wherein the tacky material is a rubber material or an adhesive material, preferably a silicone adhesive material or a polyether block amide based adhesive material.

4. The stent device delivery system according to claim 1, wherein the protrusions form a tacky interaction with the inner surface of the stent device by way of the tacky material.

5. The stent device delivery system according to claim 1, wherein the plurality of protrusions form a compressible bed, whereby the stent device is embedded in the compressible bed so that portions of the compressible bed protrude radially into the stent device at positions axially distributed along the stent device.

6. The stent device delivery system according to claim 5, wherein the stent device comprises an inner cover providing a layer covering an inner surface of a tubular frame of the stent device, and the protrusions deform the stent device such that portions of the stent device extend radially inwardly axially between the protrusions to provide a form fit between the stent device pusher and the stent device.

7. The stent device delivery system according to claim 1, wherein the protrusions form one or more helices extending along the length of the stent device.

8. The stent device delivery system according to claim 1, wherein the protrusions form a plurality of bands distributed along the stent device, separated by spaces between them.

9. The stent device delivery system according to claim 1, wherein the protrusions are formed of the tacky material.

10. A stent device delivery system, comprising:

a stent device pusher comprising a compressible bed;

a radially self-expandable stent device comprising a lumen extending longitudinally therethrough;

an outer sheath, the stent device being constrained in a radially contracted state by the outer sheath, the stent device being embedded in the compressible bed so that portions of the compressible bed protrude radially into the stent device at positions axially distributed along the stent device; and

a tacky material axially distributed along the stent device providing tackiness between the stent device pusher and an inner surface of the stent device, wherein the tackiness and the protruding portions of the compressible bed serve to resist axial movement of the stent device relative to the stent device pusher as the outer sheath slides axially over the stent device and the tacky material is such that it allows the stent device to peel from the tacky material and expand to a radially expanded state as the outer sheath slides axially over the stent device to release the stent device

11. The stent device delivery system according to claim 10, wherein the tacky material is uniformly distributed along and about the inner surface of the stent device.

12. The stent device delivery system according to claim 10, wherein the tacky material is a rubber material or an adhesive material, preferably a silicone adhesive material or a polyether block amide based adhesive material.

13. The stent delivery device according to claim 10, wherein the tacky material is deformed into a compressed state by the stent device being embedded therein, whereby portions of the tacky material protrude radially into the stent device at positions axially distributed along the stent device to provide a form fit between the stent device pusher and the stent device.

14. The stent device delivery system according to claim 10, wherein the compressible bed forms protrusions with axially extending spaces between them, whereby protrusions of the stent pusher engage the inner surface of the stent device at positions axially distributed along the stent device.

15. The stent device delivery system according to claim 14, wherein the stent device comprises an inner cover providing a layer covering an inner surface of a tubular frame of the stent device, the tacky material providing a tacky interaction with the inner cover, and the protrusions deforming the inner cover to provide a form fit between the stent device and the stent device pusher.

16. The stent device delivery system according to claim 10, wherein the compressible bed is formed as a continuous layer of the tacky material extending along and about the inner surface of the stent device, wherein the stent device is embedded in the layer of tacky material.

17. A method of loading a stent device into an outer sheath of a stent device delivery system, comprising:

providing a radially self-expandable stent device having a lumen extending longitudinally therethrough;

providing a stent device pusher comprising protrusions with axially extending spaces between them, an adhesive material distributed along the stent device pusher providing a tackiness between the inner surface of the stent device and the stent device pusher, wherein the tackiness and the engagement of the protrusions with the inner surface of the stent device serves to resist axial movement of the stent device relative to the stent device pusher as an outer sheath slides over the stent device, and the tacky material is such that it allows the stent device to peel from the tacky material to expand to a radially expanded state when the outer sheath is retracted and the stent device is thereby released; and

inserting the stent device mounted to the stent device pusher into the outer sheath of the stent device delivery system so that the stent device is constrained within the outer sheath and an inner surface of the stent device engages the protrusions at positions distributed axially along the stent device.

18. The method according to claim 17, wherein the protrusions comprise a compressible bed that protrudes radially into the stent device at positions distributed axially along the stent device.