PUSHER GUIDEWIRE

• US 20140364865A1
• Filed: 01/14/2014
• Published: 12/11/2014
• Est. Priority Date: 06/05/2013
• Status: Abandoned Application

• Current Assignee: Asahi Intecc Company Limited
• Original Assignee: Asahi Intecc Company Limited
• Inventors: NISHIGISHI, Makoto
• Application Number:
  US14/154,845
• Publication Number:
  US 20140364865A1
• 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 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
• CPC Class Codes: A61F 2002/9528 for retrieval of stents
• CPC Class Codes: A61F 2002/9534 for repositioning of stents
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61M 2025/09083 having a coil around a core
• CPC Class Codes: A61M 2025/09175 having specific characteristics at the distal tip

Abstract

In a pusher guidewire, a front end coil has a free rear end that is not fixed to a first front end portion of a core shaft. By pulling the core shaft toward the rear end, the free rear end catches a gap of a partially-deployed stent. By rotating the core shaft in this state, a front end portion of the stent deployed from a front end opening of a catheter is wrapped around the outer circumference of the front end coil. Further pulling the core shaft toward the rear end with the wrapped stent retrieves the partially-deployed stent into the catheter, thereby preventing the stent from damaging the inner wall of a normal blood vessel.

Claims

1. A pusher guidewire for delivering a stent to a target site, the pusher guidewire comprising:

a core shaft;

a coil covering a front end portion of the core shaft; and

a joining member joining the front end portion of the core shaft to the coil, wherein

a rear end of the coil is a free end that is not fixed to the core shaft.

2. The pusher guidewire according to claim 1, wherein

an outer diameter of the coil is larger from the joining member to the rear end of the coil than from a front end of the coil to the joining member.

3. The pusher guidewire according to claim 1, wherein

a wire diameter of a wire constituting the coil is larger from the joining member to the rear end of the coil than from a front end of the coil to the joining member.

4. The pusher guidewire according to claim 1, wherein

a winding pitch of the coil is larger from the joining member to the rear end of the coil than from a front end of the coil to the joining member.

5. The pusher guidewire according to claim 1, wherein

the rear end of the coil is provided with a latching member.

6. The pusher guidewire according to claim 2, wherein

a wire diameter of a wire constituting the coil is larger from the joining member to the rear end of the coil than from a front end of the coil to the joining member.

7. The pusher guidewire according to claim 2, wherein

a winding pitch of the coil is larger from the joining member to the rear end of the coil than from a front end of the coil to the joining member.

8. The pusher guidewire according to claim 2, wherein

the rear end of the coil is provided with a latching member.

9. The pusher guidewire according to claim 3, wherein

a winding pitch of the coil is larger from the joining member to the rear end of the coil than from a front end of the coil to the joining member.

10. The pusher guidewire according to claim 3, wherein

the rear end of the coil is provided with a latching member.

11. The pusher guidewire according to claim 4, wherein

the rear end of the coil is provided with a latching member.

12. The pusher guidewire according to claim 1, wherein

an outer diameter of the coil is larger at the rear end of the coil than at the front end of the coil.

13. The pusher guidewire according to claim 1, wherein

a wire diameter of a wire constituting the coil is larger at the rear end of the coil than at a front end of the coil.

14. The pusher guidewire according to claim 1, wherein

a winding pitch of the coil is larger at the rear end of the coil than at a front end of the coil.