Stent delivery system

• US 20050027306A1
• Filed: 07/30/2004
• Published: 02/03/2005
• Est. Priority Date: 10/17/2000
• Status: Active Grant

• Current Assignee: Medtronic Vascular, Inc. (Medtronic Plc)
• Original Assignee: Medtronic Ave Incorporated (Medtronic Plc)
• Inventors: Griswold, Erik, Berthiaume, William, Krivoruchko, Mike, Tran, Don, Swanson, Vance, Bilge, Fertac, Miller, Sean, Singkeo, Somboune, Kristoffersen, Kris
• Granted Patent: US 7,356,903 B2
• Time in Patent Office: Days
• US Class Current: 606/108
• 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 2/9522 Means for mounting a stent or stent-graft onto or into a placement instrument
• CPC Class Codes: Y10T 29/49863 with prestressing of part
• CPC Class Codes: Y10T 29/49872 Confining elastic part in socket
• CPC Class Codes: Y10T 29/49908 Joining by deforming
• CPC Class Codes: Y10T 29/49925 Inward deformation of aperture or hollow body wall
• CPC Class Codes: Y10T 29/53917 Tube with tube

Abstract

The present invention is a device for delivering a self-expanding stent. The device has an inner shaft and an outer shaft moveable with respect to the inner shaft. The self expanding stent is received on the inner shaft adjacent its distal end. A tapered tip is located on the inner shaft distal end and it forms a smooth transition from the delivery device to the guide wire extending therethrough. A handle allows the practitioner to deploy the stent single handedly. The stent may have its segments in a first radial configuration for deliver of the stent or the stent may have a plurality of segments in a first radial configuration and a plurality of second segments in a second radial position.

Claims

1. A device for delivering a stent, the device comprising:

a) an inner shaft having a proximal end and a distal end;

b) an outer shaft moveable with respect to the inner shaft, the outer shaft having a proximal end and a distal end;

c) a stent receiving area on the inner shaft adjacent the inner shaft distal end;

d) a tapered tip mounted on the inner shaft distal end;

e) means coupled to the inner shaft and outer shaft for manipulating the outer shaft with respect to the inner shaft; and

f) a stent positioned in the stent receiving area.

2. A device of claim 1 and further comprising a channel member disposed between the

inner shaft and the outer shaft.

3. A device of claim 2 wherein the channel member defines a plurality of channels extending along a length of a lumen defined between the outer shaft and the inner shaft.

4. A device of claim 3 wherein the channel member defines eight channels extending along the length of the lumen defined between the outer shaft and the inner shaft.

5. A device of claim 2 wherein the channel member extends from the inner shaft.

6. A device of claim 1 and further comprising a radiopaque marker on the inner shaft approximate the stent receiving area.

7. A device of claim 1 and further comprising a coupling member on said outer shaft and a valve relief, the coupling member selectively coupling the valve relief to the outer shaft.

8. A device of claim 1 wherein the means coupled to the outer shaft and inner shaft comprises a handle with a reciprocating knob coupled to the outer shaft whereby the outer shaft is moved with respect to the movement of the knob.

9. A device of claim 1 wherein the means coupled to the outer shaft and inner shaft includes a moveable knob coupled to the inner shaft for moving the inner shaft longitudinally with respect to the outer shaft.

10. A device of claim 1 wherein the tip has a proximal end and a distal end and the tip is tapered towards its distal end.

11. A device of claim 1 wherein the stent receiving area has a stent stop.

12. A device of claim 1 wherein the stent stop comprises the radiopaque marker.

13. A device of claim 1 and further comprising a radiopaque marker on the distal end of the outer shaft.

14. A device of claim 1 wherein the stent has a plurality of segments in a first radial position and a plurality of second segments in a second radial position when in an unexpanded configuration.

15. A method for mounting on a delivery system a stent comprising a plurality of segments, the method comprising:

a) reducing the plurality of segments to a first radial position;

b) moving selected stent segments from the first radial position to a second radial position, wherein the second radial position is less than the first radial position;

c) positioning the stent in the delivery system.

16. A method of claim 15 wherein positioning the stent in the delivery system comprises pulling the stent into the delivery system.

17. A method of claim 15 wherein reducing the stent to the first radial position comprises placing the stent in a roll down fixture, rolling the stent in a the roll down fixture such that the segments are in contact with each other, and placing the rolled down stent from the roll down fixture into a tubing.

18. A method of claim 15 and further including cooling the stent during steps a-c.

19. A method for mounting a self expanding stent on a delivery system having an inner shaft and an outer retractable shaft, said method comprising:

a) placing a stent in a roll down fixture, the stent defined by a plurality of segments;

b) rolling the stent down to a first radial configuration;

c) cooling the stent as it is being rolled down;

d) moving the stent from the roll down fixture into a first tubing;

e) moving the stent over the inner shaft and adjacent at least one marker band;

f) moving selected stent segments from a first radial position to a second radial position as it is moved over the inner shaft; and

g) placing the stent into the delivery sheath.