DELIVERY SYSTEM FOR A SELF EXPANDING STENT

• US 20160158049A1
• Filed: 12/04/2014
• Published: 06/09/2016
• Est. Priority Date: 05/27/2011
• Status: Active Grant

• Current Assignee: Abbotcardiovascular Systems Inc.
• Original Assignee: Abbott Cardiovascular Systems Incorporated (Abbott Laboratories Incorporated)
• Inventors: Dooley, Jeffrey
• Granted Patent: US 9,724,223 B2
• Time in Patent Office: Days
• 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 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod

Abstract

A system for delivering a stent from a catheter sheath in a longitudinal direction comprising: a thumbwheel mounted on an axle, the axle being supported by opposite walls of a housing; a first pinion mounted on the axle; a second pinion mounted on the axle, whereby rotation of the thumbwheel causes rotation of the first pinion and rotation of the second pinion; a first rack, enageable with the first pinion at a first surface of the first pinion, the first rack being operably connected with a stent-engaging member; a second rack, engageable with the second pinion at a second surface of the second pinion, the second surface being disposed in a direction diametrically opposite the first surface, the second rack being operably connected with a sheath configured to confine the stent.

Claims

1. A system for delivering a stent from a catheter sheath in a longitudinal direction comprising:

a thumbwheel mounted on an axle, the axle being supported by opposite walls of a housing;

a first pinion mounted on the axle;

a second pinion mounted on the axle, whereby rotation of the thumbwheel causes rotation of the first pinion and rotation of the second pinion;

a first rack, enageable with the first pinion at a first surface of the first pinion, the first rack being operably connected with a stent-engaging member;

a second rack, engageable with the second pinion at a second surface of the second pinion, the second surface being disposed in a direction diametrically opposite the first surface, the second rack being operably connected with a sheath configured to confine the stent.

2. The system of claim 1, wherein the axle is mounted in a circular bearing in each of opposite walls of the housing, and wherein the first rack and the second rack are spaced apart to allow the first pinion to be engaged with the first rack at the same time as the second pinion is engaged with the second rack.

3. The system of claim 2, wherein the first pinion has a first diameter and the second pinion has a second diameter, the first diameter being different from the second diameter.

4. The system of claim 1, wherein the axle is mounted in an elongated slot in each of opposite walls of the housing, the slot having an elongate direction that extends between the first surface and the second surface, and wherein the first rack and the second rack are spaced apart to allow the first pinion to be engaged with the first rack while the second pinion is disengaged from the second rack, and separately, to allow the second pinion to be engaged with the second rack while the first pinion is disengaged from the first rack.

5. The system of claim 4, further including a biasing element configured to bias the axle to a first end of the elongated slot, such that the second pinion is engaged with the second rack.

6. The system of claim 5, further including a lever attached to the housing and configured to be operable by a user to urge the axle, against the biasing element, to a second end of the elongated slot opposite the first end, such that the first pinion is engaged with the first rack.

7. The system of claim 6, wherein the lever is rotatably pinned to the housing.

8. A method of delivering a stent from a catheter sheath, the catheter being of a kind that includes a stent-engagement member, and a sheath surrounding the stent, the method comprising:

rolling a thumbwheel in one direction; and

simultaneously with rolling the thumbwheel in one direction;

advancing the stent-engagement member; and

retracting the sheath.

9. The method of claim 8, wherein advancing the stent-engagement member and retracting the sheath includes advancing the stent-engagement member by a first distance and retracting the sheath by a second distance, wherein the first distance is different from the second distance.

10. The method of claim 9, wherein the first distance is larger than the second distance.

11. A method of delivering a stent from a catheter sheath, the catheter being of a kind that includes a stent-engagement member, and a sheath surrounding the stent, the method comprising:

engaging the stent-engagement member to be operably connected with a thumbwheel;

rolling the thumbwheel, thereby advancing the stent-engagement member;

disengaging the stent-engagement member from the thumbwheel;

engaging the sheath to be operably connected with the thumbwheel; and

rolling the thumbwheel, thereby retracting the sheath.

12. The method of claim 11, wherein engaging the stent-engagement member includes disengaging the sheath.

13. The method of claim 11, wherein engaging the sheath includes disengaging the stent-engaging member.

14. The method of claim 11, wherein rolling the thumbwheel to advance the stent-engaging member, and rolling the thumbwheel to retract the sheath includes rolling the thumbwheel in the same direction in each instance of rolling the thumbwheel.

15. The method of claim 11, wherein engaging the stent-engaging member includes operating a trigger attached to a housing of the catheter.

16. The method of claim 11, wherein engaging the sheath includes operating a trigger attached to a housing of the catheter.