Stent delivery system

• US 7,356,903 B2
• Filed: 07/30/2004
• Issued: 04/15/2008
• Est. Priority Date: 10/17/2000
• Status: Expired due to Fees

• Current Assignee: Medtronic Vascular, Inc. (Medtronic Plc)
• Original Assignee: Medtronic Vascular, Inc. (Medtronic Plc)
• Inventors: Griswold, Erik, Tran, Don, Swanson, Vance, Bilge, Fertac, Miller, Sean, Singkeo, Somboune, Kristoffersen, Kris, Berthiaume, William, Krivoruchko, Mike
• Primary Examiner(s): Bryant; David P.
• Assistant Examiner(s): Koehler; Christopher M
• Application Number:
  US10/903,757
• Publication Number:
  US 20050027306A1
• Time in Patent Office: 1,355 Days
• Field of Search: 294/45, 294/46, 294/50, 294/51, 294/52, 292/72, 292/815, 292/835, 295/25, 295/05, 295/15, 623/1.11, 623/1.12, 623/1.15, 623/1.16
• US Class Current: 29/446
• 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 method for mounting on a delivery system a stent comprising a plurality of tubular segments connected in series, the method comprising:

a) reducing the plurality of tubular segments to a first radial position, each of the tubular segments comprising a plurality of crowns located at the first radial position;

b) moving selected crowns 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.

2. A method of claim 1 wherein positioning the stent in the delivery system comprises pulling the stent into the delivery system.

3. A method of claim 1 wherein reducing the stent to the first radial position comprises placing the stent in a roll down fixture, rolling the stent in the roll down fixture such that the crowns are in contact with each other, and placing the rolled down stent from the roll down fixture into a tubing.

4. A method of claim 1 and further including cooling the stent during steps a-c.

5. A method of claim 3 wherein the delivery system comprises an inner shaft and an outer retractable shaft, said method further comprising:

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

placing the stent into the outer retractable sheath.

6. A method of claim 1 further comprising cutting the stent from a single hypodermic tube.

7. A method of claim 6 wherein the single hypodermic tube consists of a nickel-titanium alloy hypodermic tube.

8. A method of claim 7 wherein the stent is a self expanding stent.

9. A method of claim 1 wherein the tubular segments comprise a sinusoidal pattern.

10. A method of claim 1 wherein the tubular segments alternative with a different number of the crowns.

11. A method of claim 1 wherein a first tubular segment of the tubular segments consists of twelve crowns and a second tubular segment of the tubular segments consists of fifteen crowns.

12. A method of claim 1 wherein three crowns of the fifteen crowns of the second tubular segment are moved from the first radial position to the second radial position during the moving selected crowns from the first radial position to a second radial position.

13. A method of claim 1 wherein the moving selected crowns from the first radial position to a second radial position reduces the diameter of the stent.