HELICAL THROMBUS REMOVAL DEVICE

• US 20090076539A1
• Filed: 09/14/2007
• Published: 03/19/2009
• Est. Priority Date: 09/14/2007
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Incorporated (Cook Group Incorporated)
• Inventors: VALAIE, ARMAN H.
• Granted Patent: US 8,419,748 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• CPC Class Codes: A61B 17/22031 Gripping instruments, e.g. forceps, for removing or smashing calculi A61B17/221 takes precedence
• CPC Class Codes: A61B 17/22032 having inflatable gripping elements balloon catheters A61M25/10
• CPC Class Codes: A61B 2017/00867 shape memory effect for prostheses A61F2210/0014
• CPC Class Codes: A61B 2017/00871 polymeric
• CPC Class Codes: A61B 2017/22034 for gripping the obstruction or the tissue part from inside

Abstract

A device for removing thrombus from a body cavity is disclosed. The device comprises a flexible wire having a proximal end and a distal end. The device further comprises an elongated shaft having a proximal portion and a distal portion. The proximal portion attached to the distal end of the flexible wire and distally extends therefrom to the distal portion. The device further comprises an expandable member formed helically about the elongated shaft. The expandable member is configured to helically close, defining a collapsed state for delivery and retrieval of the device. The expandable member is configured to helically open, defining an expanded state for removing thrombus from the body cavity. The expandable member has at least one member portion helically extending from the elongated shaft at a predetermined angle, defining a proximally faced opening when the member is in the expanded state.

Claims

1. A device for removing thrombus from a body cavity, the device comprising:

a flexible wire having a proximal end and a distal end;

an elongated shaft having a proximal portion and a distal portion, the proximal portion attached to the distal end of the flexible wire and distally extending therefrom to the distal portion; and

an expandable member formed helically about the elongated shaft, the expandable member being configured to helically close defining a collapsed state for delivery and retrieval of the device, the expandable member being configured to helically open defining an expanded state for removing thrombus from the body cavity, the expandable member having at least one member portion helically extending from the elongated shaft at a predetermined angle defining a proximally faced opening when the member is in the expanded state.

2. The device of claim 1 wherein the predetermined angle is between about 40 and 70 degrees.

3. The device of claim 1 wherein the predetermined angle is between about 55 and 65 degrees.

4. The device of claim 1 wherein the at least one member portion is a plurality of member portions.

5. The device of claim 4 wherein each of the plurality of member portions is in coaxial alignment with each other about the elongated shaft.

6. The device of claim 1 wherein the expandable member is disposed along a longitudinal axis, the expandable member being helically closed in the collapsed state when the elongated shaft is rotated about the longitudinal axis in a first direction and the expandable member is helically opened in the expanded state when the elongated shaft is rotated about the longitudinal axis in a second direction.

7. The device of claim 1 wherein the expandable member comprises at least one of the following materials:

superelastic material, nitinol, polymeric material.

8. A clot removal assembly for removing thrombus from a body cavity, the assembly comprising:

an inner catheter having a tubular body portion;

an outer catheter having a distal end throughwhich the inner catheter is disposed for deployment in the body vessel; and

a clot removal device coaxially disposed within the inner catheter for removal of thrombus in a body cavity, the device comprising;

a flexible wire having a proximal end and a distal end;

an elongated shaft having a proximal portion and a distal portion, the proximal portion attached to the distal end of the flexible wire and distally extending therefrom; and

an expandable member formed helically about the distal portion of the elongated shaft, the expandable member being configured to helically close defining a collapsed state for delivery and retrieval of the device, the expandable member being configured to helically open defining an expanded state for removing thrombus from the body cavity, the expandable member having at least one member portion helically extending from the elongated shaft at a predetermined angle defining an opening when the member is in the expanded state.

9. The assembly of claim 8 further comprising:

an introducer sheath throughwhich the outer catheter is inserted for percutaneous insertion to the body vessel; and

a wire guide introducible through the introducer sheath to the body cavity for guidance of the inner and outer catheters to the body cavity.

10. The assembly of claim 8 wherein the predetermined angle is between about 40 and 70 degrees.

11. The assembly of claim 8 wherein the predetermined angle is between about 55 and 65 degrees.

12. The assembly of claim 8 wherein the at least one member portion is a plurality of member portions.

13. The assembly of claim 8 wherein the opening of each filter portion has an outer diameter, the outer diameter increasing distally longitudinally relative to the elongated shaft to define the expandable filter having a distally flared profile.

14. The assembly of claim 8 wherein the expandable member is disposed along a longitudinal axis, the expandable member being helically closed in the collapsed state when the elongated shaft is rotated about the longitudinal axis in a first direction and the expandable member is helically opened in the expanded state when the elongated shaft is rotated about the longitudinal axis in a second direction.

15. A method for removing thrombus from a body vessel, the method comprising:

percutaneously introducing an inner catheter in the body vessel, the inner catheter having a tubular body portion;

disposing a clot removal device in a collapsed state coaxially within the inner catheter, the device comprising;

an elongated shaft having a proximal portion and a distal portion; and

an expandable member formed helically about the distal portion of the elongated shaft, the expandable member being configured to helically close defining the collapsed state for delivery through a thrombus in the body vessel of the device, the expandable member being configured to helically open defining an expanded state for removing thrombus in the body vessel, the expandable member having at least one member portion helically extending from the elongated shaft at a predetermined angle defining a proximally faced opening when the member is in the expanded state; and

deploying the device in the collapsed state into the body vessel proximal to the thrombus;

advancing the device in the collapsed state through the thrombus;

opening the expandable member to the expanded state to receive the thrombus for removal of the thrombus from the body vessel; and

retracting the device with the thrombus in the expandable member thereby removing the thrombus from the body vessel.

16. The method of claim 15 wherein the expandable member is disposed along a longitudinal axis, the expandable member being helically closed in the collapsed state when the elongated shaft is rotated about the longitudinal axis in a first direction and the expandable member is helically opened in the expanded state when the elongated shaft is rotated about the longitudinal axis in a second direction.

17. The method of claim 16 wherein opening includes rotating the elongated shaft about the longitudinal axis in the second direction.

18. The method of claim 15 wherein retracting includes rotating the elongated shaft about the longitudinal axis in the first direction to secure the thrombus in the expandable member.