Clot engagement and removal system

• US 9,351,749 B2
• Filed: 09/09/2015
• Issued: 05/31/2016
• Est. Priority Date: 10/22/2010
• Status: Active Grant

• Current Assignee: Neuravi Limited (Johnson & Johnson)
• Original Assignee: Neuravi Limited (Johnson & Johnson)
• Inventors: Brady, Eamon, Gilvarry, Michael, Razavi, Mahmood K., Vale, David
• Primary Examiner(s): Anderson, Gregory
• Assistant Examiner(s): DANG, PHONG SON H
• Application Number:
  US14/849,294
• Publication Number:
  US 20150374393A1
• Time in Patent Office: 265 Days
• US Class Current: 1/1
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 2017/22034 for gripping the obstruction or the tissue part from inside
• CPC Class Codes: A61B 2017/22039 eccentric
• CPC Class Codes: A61B 2017/22094 for crossing total occlusions, i.e. piercing
• CPC Class Codes: A61B 2017/2212 having a closed distal end, e.g. a loop
• CPC Class Codes: A61B 2017/2217 single wire changing shape to a gripping configuration

Abstract

A clot retrieval apparatus 1 comprises a clot engaging device 2 and a capture basket 3. The clot engaging device 2 has a collapsed delivery configuration and an expanded deployment configuration. The clot engaging device has a proximal end and a distal end and an elongate body between the proximal end and the distal end. The capture basket 3 has a collapsed delivery configuration and an expanded deployment configuration. The capture basket 3 has a proximal mouth which is open when the capture basket 3 is in the deployment configuration. The clot engaging device 2 is axially movable relative to the capture basket for capture of a clot.

Claims

1. A method of removing clot from a vessel, the method comprising:

extending a delivery member across the clot;

deploying a capture basket distal of the clot, the capture basket having a collapsed delivery configuration and an expanded deployment configuration, the capture basket having a proximal mouth which is open when the capture basket is in the deployed configuration;

deploying a clot engaging device so as to be in contact with the clot, the clot engaging device having a collapsed delivery configuration and an expanded deployment configuration, the clot engaging device having a proximal end and a distal end and an elongate body between the proximal end and the distal end;

selectively increasing an outward force of the capture basket to increase coupling of the capture basket with the vessel when the capture basket is in the deployed configuration;

retracting the clot engaging device proximally along the vessel away from the capture basket while engaging the vessel with the capture basket; and

retracting the capture basket proximally toward the clot engaging device so as to pin the clot between the capture basket and the clot engaging device while at least a portion of the clot engaging device is within the clot.

2. The method of claim 1, wherein the clot engaging device comprises a mesh.

3. The method of claim 2, wherein the mesh comprises a plurality of struts.

4. The method of claim 3, wherein at least some of the struts form closed cells.

5. The method of claim 1, wherein the capture basket comprises a capture net and a support frame for the capture net.

6. The method of claim 5, wherein the support frame includes a figure eight pattern with a cross-over point.

7. The method of claim 1, wherein selectively increasing an outward force of the capture basket includes applying a force to a control tether coupled to the proximal mouth.

8. A method of removing clot from a vessel, the method comprising:

deploying a capture basket distal of the clot, the capture basket having a collapsed delivery configuration and an expanded deployment configuration, the capture basket having a proximal mouth which is open when the capture basket is in the deployed configuration, the capture basket being connected to a first elongate shaft;

deploying a clot engaging device so as to be in contact with the clot, the clot engaging device having a collapsed delivery configuration and an expanded deployment configuration, the clot engaging device having a proximal end and a distal end and an elongate body between the proximal end and the distal end, the clot engaging device being connected to a second elongate shaft element;

selectively increasing an outward force of the capture basket to increase coupling of the capture basket with the vessel when the capture basket is in the deployed configuration;

retracting the clot engaging device proximally along the vessel away from the capture basket while engaging the vessel with the capture basket and maintaining the capture basket stationary along the vessel; and

retracting the capture basket proximally toward the clot engaging device so as to pin the clot between the capture basket and the clot engaging device while at least a portion of the clot engaging device is within the clot.

9. The method of claim 8, wherein the capture basket comprises a capture net and a support frame for the capture net.

10. The method of claim 9, wherein the support frame includes a figure eight pattern with a cross-over point.

11. The method of claim 8, wherein selectively increasing an outward force of the capture basket includes applying a force to a control tether coupled to the proximal mouth.

12. A method of removing clot from a vessel, the method comprising:

deploying a vessel engaging element distal of the clot, the vessel engaging element having a collapsed delivery configuration and an expanded deployment configuration, the vessel engaging element being connected to a first elongate shaft element;

deploying a clot engaging element so as to be in contact with the clot, the clot engaging element having a collapsed delivery configuration and an expanded deployment configuration, the clot engaging element having a proximal end and a distal end and an elongate body between the proximal end and the distal end, the clot engaging element being connected to a second elongate shaft element;

engaging a vessel wall with the vessel engaging element;

while engaging the vessel wall with the vessel engaging element, retracting the second shaft element relative to the first shaft element so as to retract the clot engaging element proximally along the vessel away from the vessel engaging element; and

retracting the vessel engaging element proximally toward the clot engaging device so as to pin the clot between the vessel engaging element and the clot engaging device while at least a portion of the clot engaging device is within the clot.

13. The method of claim 12, wherein the vessel engaging element comprises a capture net and a support frame for the capture net.

14. The method of claim 13, wherein the support frame includes a figure eight pattern with a cross-over point.

15. The method of claim 14, wherein engaging the vessel wall includes applying a force to a control tether coupled to the vessel engaging element.