Delivery System Ejection Component and Method

• US 20110251666A1
• Filed: 04/13/2010
• Published: 10/13/2011
• Est. Priority Date: 04/13/2010
• Status: Active Grant

• Current Assignee: Medtronic Vascular, Inc. (Medtronic Plc)
• Original Assignee: Medtronic Vascular, Inc. (Medtronic Plc)
• Inventors: Schmitt, Joshua J., Argentine, Jeffery
• Granted Patent: US 8,663,302 B2
• Time in Patent Office: Days
• US Class Current: 623/1.11
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/9661 the proximal portion of the stent or stent-graft is released first
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61F 2250/0039 differing in diameter

Abstract

A stent or stent-graft delivery system includes a stent ejection component. The stent ejection component includes a body and an ejection collar. The ejection collar extends from the body in the proximal direction. The ejection collar assists in automatically ejecting a proximal end of a stent when the tapered tip is moved in the distal direction to deploy the stent. A stent or stent-graft delivery system may also include a retain-sleeve landing component. The retaining-sleeve landing component includes a body and a landing collar. The landing collar extends from the body in a distal direction. The landing collar automatically captures a tapered tip of the delivery system when the tapered tip is moved in a distal direction to deploy a stent contained in the delivery system. Upon capture of the tapered tip, the stent ejection component with the tapered tip attached has an atraumatic profile.

Claims

1. A graft delivery system comprising:

a spindle tube;

a spindle mounted on the spindle tube; and

a retaining-sleeve landing component, fixed to the spindle tube distal to the spindle, comprising;

a body; and

a landing collar extending distally from the body.

2. The graft delivery system of claim 1, wherein the landing collar further comprises:

a plurality of cantilevered landing beams.

3. The graft delivery system of claim 2, wherein adjacent cantilevered landing beams are separated by a slot.

4. The graft delivery system of claim 2 wherein each cantilevered landing beam, in the plurality of cantilevered landing beams, includes an atraumatic profile.

5. The graft delivery system of claim 2 wherein at least one cantilevered landing beam in the plurality of cantilevered landing beams includes:

a ridge; and

an inclined portion extending from the body to the ridge.

6. The graft delivery system of claim 5 wherein the at least one cantilevered beam further comprises:

a landing tab extending distally from the ridge.

7. The graft delivery system of claim 6, wherein an outer radius of the ridge is greater than an outer radius of the landing tab.

8. The graft delivery system of claim 1 further comprising:

a tube, extending through the spindle tube, having a distal end; and

a tip, mounted on the distal end of the tube, comprising a retaining sleeve,

wherein the retaining sleeve is a proximal portion of the tip,

said retaining sleeve is movable over the retaining-sleeve landing component; and

said landing collar includes an element with an outer radius greater than an inner radius of the retaining sleeve.

9. The graft delivery system of claim 1, wherein the landing collar is a ridge.

10. The graft delivery system of claim 9 wherein the outer radius of the ridge is greater than an outer radius of the body so that the landing collar includes an atraumatic profile between the body and the ridge.

11. The graft delivery system of claim 1, wherein the retaining-sleeve landing component and the spindle are a single integral element, the spindle further comprising:

a plurality of spindle pins, wherein the body is distal to the plurality of spindle pins.

12. The graft delivery system of claim 11, wherein each spindle in the plurality of spindle pins has a rounded profile.

13. The graft delivery system of claim 1, wherein a portion of the landing collar has an atraumatic profile.

14. The graft delivery system of claim 13, wherein the portion comprises an inclined portion.

15. The graft delivery system of claim 1, wherein the landing collar comprises a cylinder having an outer circumferential surface of substantially uniform radius.

16. The graft delivery system of claim 1,

wherein the spindle includes a plurality of spindle pins, and the body is distal to the plurality of spindle pins;

and

said landing collar further comprises;

a proximal portion having an atraumatic profile; and

a distal portion comprising a hollow cylinder having an outer circumferential surface of substantially uniform radius.

17. The graft delivery system of claim 1 further comprising:

a tube, extending through the spindle tube, having a distal end; and

a tip, mounted on the distal end of the tube, comprising a retaining sleeve,

wherein the retaining sleeve is a proximal portion of the tip,

said retaining sleeve is movable over the retaining sleeve landing component; and

said landing collar including a distal portion with an outer radius approximately equal to an inner radius of the retaining sleeve.

18. The graft delivery system of claim 17, the distal portion of the landing collar has a length so that at least part of the distal portion remains within the retaining sleeve following stent deployment.

19. The graft delivery system of claim 17, the landing collar further comprising a proximal portion extending distally from the component body to the distal portion, wherein the proximal portion has an atraumatic profile.

20. A method comprising:

moving a tip of a stent graft delivery system mounted on an inner tube in a distal direction, wherein the tip includes a retaining sleeve at a proximal end of the tip; and

capturing the retaining sleeve on a landing collar attached to an outer tube of the graft delivery system as a result of the moving, wherein the inner tube moves through the outer tube.