RATCHET OPERATED VASCULAR INTERVENTION DEVICE DELIVERY SYSTEM

• US 20160074184A1
• Filed: 07/15/2015
• Published: 03/17/2016
• Est. Priority Date: 09/15/2014
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Inventors: Cummins, Sean, McGrath, Darach
• Granted Patent: US 10,098,768 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 2017/00407 Ratchet means
• CPC Class Codes: A61F 2/844 folded prior to deployment
• 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 2/962 having an outer sleeve
• 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 2230/0069 cylindrical

Abstract

A vascular intervention device delivery system, such as for implanting a self expanding stent, includes a thumbwheel rotatably mounted in a handle. The thumbwheel includes a radially outward thumb surface and a radially inward ratchet surface of a ratchet. A catheter has a proximal end attached to the handle, and a distal carrier segment for mounting a vascular intervention device thereon. A retractable sheath is movable from a first position covering the distal carrier segment to a second position retracted proximally uncovering the distal carrier segment. A pull extends between the thumbwheel and the retractable sheath. A ratchet pawl is mounted in the handle and has a catch in contact with the ratchet surface. The ratchet holds the thumbwheel against rotation in a forward direction, and the retractable sheath moves responsive to rotation of the thumbwheel in a reverse direction.

Claims

1. A vascular intervention device delivery system comprising:

a handle;

a thumbwheel rotatably mounted in the handle and having a radially outward thumb surface and a radially inward ratchet surface of a ratchet;

a catheter with a proximal end attached to the handle, and a distal carrier segment for mounting a vascular intervention device thereon;

a retractable sheath movable from a first position covering the distal carrier segment, and a second position retracted proximally uncovering the distal carrier segment; and

a pull extending between the thumbwheel and the retractable sheath;

a ratchet pawl of the ratchet being mounted in the handle and having a catch in contact with the ratchet surface; and

the ratchet locking the thumbwheel against rotation in a forward direction, and the retractable sheath moving responsive to rotation of the thumbwheel in a reverse direction.

2. The vascular intervention device delivery system of claim 1 including a lock movable between a locked position and an unlocked position;

the lock includes a latch positioned in the handle and movable along a line between the locked position at which the latch engages the radially outward thumb surface, and the unlocked position at which the latch is out of contact with the radially outward thumb surface; and

a pusher at least partially positioned outside the handle and being operably coupled to move the latch from the locked position to the unlocked position.

3. The vascular intervention device delivery system of claim 2 wherein the pusher includes a wedge that engages a post that is attached to the latch and oriented perpendicular to the line.

4. The vascular intervention device delivery system of claim 1 wherein the ratchet pawl includes three catches that simultaneously contact the ratchet surface at three different locations.

5. The vascular intervention device delivery system of claim 4 wherein the ratchet pawl includes a key shaped central opening that receives a matching key shaped hub attached to the handle.

6. The vascular intervention device delivery system of claim 4 wherein each of the three catches are attached to a central body of the ratchet pawl by a living hinge.

7. The vascular intervention device delivery system of claim 6 including a lock movable between a locked position and an unlocked position;

the lock includes a latch positioned in the handle and movable along a line between the locked position at which the latch engages the radially outward thumb surface, and the unlocked position at which the latch is out of contact with the radially outward thumb surface; and

a pusher at least partially positioned outside the handle and being operably coupled to move the latch from the locked position to the unlocked position.

8. The vascular intervention device delivery system of claim 1 wherein the ratchet surface defines at least fifty stops per revolution of the thumbwheel.

9. The vascular intervention device delivery system of claim 1 wherein the catch is a deformed band of spring steel;

and

the ratchet surface defines a plurality of stops in each of four ninety degree rotations angles.

10. The vascular intervention device delivery system of claim 9 wherein the handle includes an assembly plate with a hub defining an axis, and defining an S shaped groove oriented parallel to the axis;

the catch being received in the S shaped groove; and

the thumbwheel being mounted for rotation on the hub about the axis.

11. The vascular intervention device delivery system of claim 10 wherein the band has a width, and contacts the ratchet surface across the width.

12. The vascular intervention device delivery system of claim 11 wherein the band has length greater than a radius of the thumbwheel.

13. The vascular intervention device system of claim 12 wherein a line extending from an end of the catch to the axis is orthogonal to the pull.

14. The vascular intervention device delivery of claim 1 including a self expanding stent positioned radially between the sheath and the distal carrier segment of the catheter.

15. The vascular intervention device delivery system of claim 14 including a lock movable between a locked position and an unlocked position;

the lock includes a latch positioned in the handle and movable along a line between the locked position at which the latch engages the radially outward thumb surface, and the unlocked position at which the latch is out of contact with the radially outward thumb surface; and

a pusher at least partially positioned outside the handle and being operably coupled to move the latch from the locked position to the unlocked position.

16. The vascular intervention device delivery system of claim 1 including an idler wheel about which the pull wraps to return in a reverse direction for being wound onto a spool of the thumbwheel.

17. The vascular intervention device delivery system of claim 1 wherein the retractable sheath moves toward the second position responsive to rotation of the thumbwheel in a reverse direction.

18. The vascular intervention device delivery system of claim 1 wherein the pull extends through a junction box.

19. A method of operating a vascular intervention device delivery system that includes a thumbwheel rotatably mounted in the handle and having a radially outward thumb surface and a radially inward ratchet surface of a ratchet;

a catheter with a proximal end attached to the handle, and a distal carrier segment for mounting a vascular intervention device thereon;

a retractable sheath movable from a first position covering the distal carrier segment, and a second position retracted proximally uncovering the distal carrier segment;

a pull extending between the thumbwheel and the retractable sheath;

a ratchet pawl of the ratchet being mounted in the housing and having a catch in contact with the ratchet surface; and

the ratchet locking thumbwheel against rotation in a forward direction, and the retractable sheath moving responsive to rotation of the thumbwheel in a reverse direction, and the method comprising the steps of;

rotating the thumbwheel in the reverse direction to build up tension in the sheath and pull without moving the sheath relative to the distal carrier segment of the catheter;

uncovering a portion, which is less than all, of the distal carrier segment by continuing to rotate the thumbwheel in the reverse direction;

pausing rotation of the thumbwheel in the reverse direction;

maintaining tension in the pull and the sheath by locking the ratchet and preventing rotation of the thumbwheel in the forward direction; and

uncovering a remaining portion of the distal carrier segment by resuming rotation of the thumbwheel in the reverse direction.

20. The method of claim 19 wherein the step of enabling operation of the thumbwheel by moving a lock from a locked position to an unlocked position.

21. The method of claim 20 wherein the step of moving a lock includes pushing a pusher to move a latch from engagement with the radially outward thumb surface to being out of contact with the radially outward thumb surface.