STENT DELIVERY SYSTEM

• US 20110190862A1
• Filed: 07/30/2010
• Published: 08/04/2011
• Est. Priority Date: 07/30/2009
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Hsueh, Kyai, Spencer, Mike, Phung, Mark, Layman, Ted, Bashiri, Mehran
• Granted Patent: US 8,241,345 B2
• Time in Patent Office: Days
• US Class Current: 623/1.11
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• 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 2002/823 Stents, different from stent-grafts, adapted to cover an aneurysm
• 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 2002/9534 for repositioning of stents
• CPC Class Codes: A61F 2002/9665 with additional retaining means

Abstract

A stent delivery system comprises a stent having a first connector disposed on a stent proximal end, and a pusher wire having a second connector disposed on a pusher wire distal end, wherein the first and second connectors are configured to releasably attach to each other.

Claims

1. A stent delivery system, comprising:

a stent having a first connector disposed on a stent proximal end; and

a pusher wire having a second connector disposed on a pusher wire distal end, wherein the first and second connectors are configured to releasably attach to each other.

2. The system of claim 1, wherein the first connector comprises a loop and the second connector comprises a protrusion.

3. The system of claim 2, wherein the loop is proximal of the protrusion, so that when the pusher wire is pulled proximally relative to the stent, the loop pulls the protrusion, which in turn pulls the stent proximally.

4. The system of claim 1, wherein the first connector comprises a bent wire and the second connector comprises a cavity that defines a shape that approximates a shape of the bent wire, wherein the bent wire is biased radially inward, so that the bent wire is biased into the cavity and when the pusher wire is pulled proximally, a wall of the cavity pulls the bent wire, which in turn pulls the stent proximally.

5. The system of claim 1, wherein the first connector comprises a flattened element and the second connector comprises a cavity that defines a shape that approximates a shape of the flattened element.

6. The system of claim 5, wherein the flattened element is biased radially inward, so that the flattened element is biased into the cavity and when the pusher wire is pulled proximally, a wall of the cavity pulls the flattened element, which in turn pulls the stent proximally.

7. The system of claim 1, the pusher wire further comprising:

a proximal bumper disposed on the pusher wire;

a re-sheathing bumper disposed on the pusher wire distal of the proximal bumper;

a middle bumper disposed on the pusher wire distal of the re-sheathing bumper; and

a distal bumper disposed on the pusher wire distal of the middle bumper, wherein the stent is disposed on the pusher wire between the proximal and distal bumpers.

8. The system of claim 7, wherein the first connector comprises a detent and the second connector comprises a notch defined by the respective proximal and re-sheathing bumpers.

9. The system of claim 8, wherein the detent is disposed in the notch, so that when the pusher wire is pulled proximally, the re-sheathing bumper pulls the detent, which in turn pulls the stent proximally.

10. The system of claim 1, wherein the first and second connectors are configured to transmit sufficient force to re-sheath a partially unsheathed stent without detaching from each other.

11. A stent delivery system, comprising:

a pusher wire, comprising;

a tubular body having a pusher wire lumen;

an elongate body disposed in the pusher wire lumen;

a funnel shaped bumper disposed on a distal end of the tubular body;

a pair of holders disposed on the elongate body; and

a middle bumper disposed on the elongate body distal of the pair of holders, wherein the pair of holders is configured to close around the middle bumper and secure a stent thereto when the elongate body is pulled proximally into the proximal body.

12. The system of claim 11, further comprising a catheter having a proximal end, a distal end, and a catheter lumen extending between the proximal end and the distal end, wherein the pusher wire is coaxially disposed within a lumen of the catheter.

13. The system of claim 11, wherein the pair of holders is biased in an open position, unless compressed.

14. The system of claim 11, wherein an opening of the funnel shaped bumper is smaller than a cross sectional area of the pair of holders when closed around the middle bumper.

15. A stent delivery system, comprising:

a pusher wire having two cups disposed thereon, wherein the respective openings of the two cups face each other and the two cups are configured to hold a stent on the pusher wire between the two cups.

16. The stent delivery system of claim 15, further comprising a catheter having a proximal end, a distal end, and a lumen extending between the proximal end and the distal end.

17. A stent delivery system, comprising:

a stent defining a stent lumen;

a sheath defining a sheath lumen configured to contain the stent; and

a pusher wire at least partially positioned in the stent lumen, the pusher wire having respective proximal and middle bumpers disposed thereon, the middle bumper being disposed distally of the proximal bumper, wherein the proximal bumper is configured to deploy the stent out of the sheath, and the middle bumper is configured to withdraw a partially deployed stent into the sheath.

18. The stent delivery system of claim 21, further comprising a delivery catheter, wherein the sheath is slidably disposed in a lumen of the delivery catheter.