Stent Delivery Catheter

• US 20080294231A1
• Filed: 01/30/2008
• Published: 11/27/2008
• Est. Priority Date: 05/16/2007
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Griffin, Stephen, Aguilar, Amiel
• Granted Patent: US 7,981,148 B2
• Time in Patent Office: Days
• 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 2002/9505 having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument
• CPC Class Codes: A61F 2002/9511 the retaining means being filaments or wires
• CPC Class Codes: A61F 2002/9665 with additional retaining means

Abstract

Stent delivery catheters comprising a hypotube, which may be a micromachined member, disposed on an outer portion of an inner member that may be an extruded multi-lumen member. The hypotube may be secured to the inner member. The devices may be adapted for delivering a self expanding stent by providing a restraining structure or device over the stent during delivery. One or more actuating members are provided through a lumen in the inner member to actuate the restraining structure and release the stent. Methods of use of such catheters are also described.

Claims

1. A catheter adapted for delivering a stent or stent-graft, the catheter comprising:

an inner member defining at least a guidewire lumen and one or more ancillary lumens, the inner member including proximal and distal ends;

one or more actuating members extending in the ancillary lumens;

a micro-machined hypotube having a plurality of openings defined therethrough disposed on the outside of the inner member and secured thereto; and

a stent releasably secured near the distal end of the inner member, at least one of the one or more actuating members allowing a user, from a proximal end, to release the stent.

2. The catheter of claim 1, wherein the hypotube is secured to the inner member at a plurality of locations along the length thereof.

3. The catheter of claim 1, wherein at least part of the inner member extends within the hypotube and includes a first region having a relatively smaller diameter and a second region having a relatively greater diameter, the hypotube being secured to the second region.

4. The catheter of claim 1, wherein the hypotube is secured to the inner member near the distal end thereof.

5. The catheter of claim 1, wherein:

the inner member includes a receiving portion for receiving a stent thereon; and

the catheter includes one or more receiving locations for receiving distal ends of at least one of the one or more actuating members, such that when a stent is disposed in the receiving portion, at least one actuating member extends thereover to a receiving location where the actuating member is removably received.

6. The catheter of claim 1, further comprising a sheath adapted to be moveably disposed over the stent to releasably retain it at a location relative the inner member, wherein at least one of the one or more actuating members is secured to the sheath.

7. The catheter of claim 6, wherein the inner member includes a proximal reduced outer diameter portion adjacent a distal reduced outer diameter portion such that the proximal reduced outer diameter portion extends beneath the hypotube, the sheath being moveable between a position over the distal reduced outer diameter portion and the proximal reduced outer diameter portion to allow a stent releasably retained on the distal reduced outer diameter portion to be released therefrom.

8. The catheter of claim 6, wherein the sheath is disposed distally of the hypotube in both an extended position for restraining the stent and a retracted portion for releasing the stent.

9. The catheter of claim 1, wherein one of the one or more of the actuating members extends out of a corresponding ancillary lumen and forms a removable structure retaining the stent in place.

10. The catheter of claim 9, wherein the removable structure is a crocheted structure.

11. The catheter of claim 1, further comprising at least one strand secured to one of the one or more actuating members and forming a removable structure retaining the stent in place.

12. The catheter of claim 11, wherein the removable structure is a crocheted structure.

13. The catheter of claim 11, wherein the removable structure is a helix, and the strand is secured near the distal end of the catheter.

14. The catheter of claim 13, wherein the strand is removably secured near the distal end of the catheter.

15. The catheter of claim 14, wherein the strand is removably secured to one of the one or more actuating members.

16. A catheter adapted for delivering a stent or stent-graft, the catheter comprising:

an inner member defining at least a guidewire lumen and one or more ancillary lumens, the inner member including proximal and distal ends;

one or more actuating members extending in one or more ancillary lumens;

a hypotube disposed on the outside of the inner member and secured thereto; and

means for releasably retaining a stent on the distal end of the inner member, the means for releasably retaining being coupled to at least one of the one or more actuating members allowing a user, from a proximal end, to actuate the means for releasably retaining a stent.

17. The catheter of claim 16, wherein the hypotube comprises a micromachined hypotube including a plurality of openings defined therethrough.

18. The catheter of claim 16, wherein the means for releasably retaining a stent includes a sheath disposed over the stent.

19. The catheter of claim 16, wherein the means for releasably retaining a stent includes a strand secured to an actuating member and forming a retaining structure.

20. A method of treatment of a patient comprising:

providing a catheter including an inner member defining at least a guidewire lumen and one or more ancillary lumens, the inner member including proximal and distal ends, one or more actuating members extending in the ancillary lumens, a micromachined hypotube, having a plurality of openings defined therethrough, disposed on the outside of the inner member and secured thereto, and a stent releasably secured near the distal end of the inner member, at least one of the actuating members allowing a user, from a proximal end, to release the stent;

introducing the catheter into the vasculature of a patient;

manipulating the catheter to place the releasably secured stent at a desired location; and

manipulating one or more of the actuating members to release the stent;

wherein the micromachined hypotube prevents manipulation of one or more of the actuating members from displacing the stent from the desire location.