Intravascular treatment of vascular occlusion and associated devices, systems, and methods

Patent metadata

Field	Value
Publication number	US-9700332-B2
Application number	US-201615268296-A
Country	US
Kind code	B2
Filing date	Sep 16, 2016
Priority date	Oct 23, 2015
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

Systems and methods for treating thrombosis and or emboli in a peripheral vasculature of a patient are disclosed herein. The method can include providing a thrombus extraction device including a proximal self-expanding coring portion formed of a unitary fenestrated structure and a distal expandable tubular portion formed of a braided filament mesh structure; advancing a catheter constraining the thrombus extraction device through a vascular thrombus in a vessel; deploying the thrombus extraction device from the catheter from a constrained configuration to an expanded configuration; retracting the thrombus extraction device proximally so that the coring portion cores and separates a portion of the vascular thrombus from the venous vessel wall while the mesh structure captures the vascular thrombus portion; and withdrawing the thrombus extraction device from the patient to remove the vascular thrombus portion from the vessel.

First claim

What is claimed is:

1. A method of treating deep vein thrombosis in a peripheral vasculature of a patient, the method comprising:
providing a thrombus extraction device comprising a proximal self-expanding coring portion formed of a unitary fenestrated structure and a distal expandable tubular portion formed of a braided filament mesh structure, wherein the mesh structure is integrally formed with the fenestrated structure so that a proximal end of the mesh structure is attached to a distal end of the fenestrated structure;
advancing a catheter constraining the thrombus extraction device through a vascular thrombus in a venous vessel, wherein an intermediate shaft slidably extends through the catheter and a distal end thereof is coupled to a proximal end of the fenestrated structure, and wherein an inner shaft slidably extends through the intermediate shaft and a distal end thereof is coupled to a distal end of the mesh structure;
deploying the thrombus extraction device from the catheter from a constrained configuration to an expanded configuration, wherein the thrombus extraction device in an expanded state engages at least a wall of the vessel distally past a portion of the vascular thrombus;
retracting the thrombus extraction device proximally so that the coring portion cores and separates a portion of the vascular thrombus from the venous vessel wall while the mesh structure captures the vascular thrombus portion; and
withdrawing the thrombus extraction device from the patient to remove the vascular thrombus portion from the venous vessel.

2. The method of claim 1 , wherein advancing the catheter comprises inserting the catheter into the venous vessel until a radiopaque distal tip of the catheter is distally past the vascular thrombus portion.

3. The method of claim 1 , wherein deploying the thrombus extraction device from the catheter from the constrained configuration to the expanded configuration comprises advancing the intermediate shaft distally until the coring portion of the thrombus extraction device is beyond a distal end of the catheter.

4. The method of claim 3 , wherein deploying the thrombus extraction device further comprises:
locking the intermediate shaft with respect to the catheter;
retracting the inner shaft with respect to the catheter and the intermediate shaft until a stop feature fixed on the inner shaft engages a corresponding feature on the coring portion slidably connected to the inner shaft for expansion of the thrombus extraction device, wherein the coring portion has a coring angle between 30 degrees and 45 degrees when the thrombus extraction device is in the expanded state, wherein the coring portion maintains sufficient radial force on the venous vessel wall to core and separate the vascular thrombus portion in the expanded state; and
dynamically coupling the inner shaft with respect to the intermediate shaft.

5. The method of claim 3 , wherein deploying the thrombus extraction device further comprises determining a position of the thrombus extraction device with respect to the catheter via imaging of a first radiopaque marker located on the catheter and a second radiopaque marker located on at least one of the intermediate shaft, the inner shaft, coring portion, or mesh structure.

6. The method of claim 1 , wherein the vascular thrombus portion is captured into the mesh structure by entering the expandable tubular portion via at least opening or aperture located at the proximal end of the self-expanding coring portion.

7. The method of claim 1 , further comprising inserting the catheter into the venous vessel through an access site, wherein the access site comprises a popliteal access site, a femoral access site, or an internal jugular access site.

8. The method of claim 1 , wherein the venous vessel has a diameter of at least 5 millimeters and comprises at least one of a femoral vein, an iliac vein, a popliteal vein, a posterior tibial vein, an anterior tibial vein, or a peroneal vein.

9. The method of claim 1 , further comprising:
percutaneously accessing the venous vessel of the patient with an introducer sheath through an access site into the venous vessel of the patient;
advancing a distal end of the introducer sheath to a position proximal of the vascular thrombus;
deploying a self-expanding funnel on the distal end of the introducer sheath; and
inserting the catheter through a lumen of the introducer sheath so that a distal tip of the catheter is distally past the vascular thrombus portion.

10. The method of claim 9 , wherein deploying the self-expanding funnel comprises:
advancing an obturator having a capture sheath feature on a distal end thereof to unsheathe the self-expanding funnel from a constrained configuration within the capture sheath feature to a deployed configuration free of the capture sheath feature; and
removing the obturator from the introducer sheath by retracting the obturator through the deployed self-expanding funnel and through the lumen of the introducer sheath.

11. The method of claim 9 , wherein withdrawing the thrombus extraction device from the patient comprises:
retracting the thrombus extraction device relative to the introducer sheath until an opening of the self-expanding coring portion is within the self-expanding funnel;
collapsing the coring portion and mesh structure so as to restrain and/or compress the vascular thrombus portion therein;
retracting the coring portion and mesh structure into the introducer sheath; and
removing the thrombus extraction device from the introducer sheath.

12. The method of claim 11 , further comprising extruding at least one piece of the vascular thrombus portion through pores located at a distal portion of the expandable tubular portion and capturing the at least one piece of the vascular thrombus portion in the self-expanding funnel or further compressing the at least one piece of the vascular thrombus portion through a mesh of the self-expanding funnel.

13. The method of claim 11 , further comprising aspirating at least one piece of the vascular thrombus portion remaining within the self-expanding funnel from the venous vessel and through an aspiration port connected to a proximal end of the introducer sheath.

14. The method of claim 11 , further comprising verifying that the opening of the self-expanding coring portion is within the self-expanding funnel via fluoroscopy prior to collapsing the coring portion and mesh structure.

15. The method of claim 11 , wherein collapsing the coring portion and mesh structure comprises:
decoupling the inner shaft and the intermediate shaft; and
advancing the inner shaft distally relative to the intermediate shaft.

16. The method of claim 1 , further comprising aspirating or infusing a thrombolytic agent into or from the venous vessel before, during, or after thrombus extraction.

17. A method of treating deep vein thrombosis in a peripheral vasculature of a patient, the method comprising:
percutaneously accessing a venous vessel of a patient with an introducer sheath through a popliteal access site into the venous vessel of the patient;
inserting a catheter constraining a thrombus extraction device through a lumen of the introducer sheath so that a distal tip of the catheter is distally past a portion of a vascular thrombus in the venous vessel, wherein the thrombus extraction device comprises a proximal self-expanding coring portion formed of a unitary fenestrated structure and a distal expandable tubular portion formed of a braided filament mesh structure, wherein a proximal end of the mesh structure is atta

Assignees

• Inari Medical
• Inari Medical Inc

Inventors

• Marchand Phil
• Thress John C
• Louw Jacob F
• Cox Brian J
• Quick Richard

Classifications

• A61B2017/22094

  for crossing total occlusions, i.e. piercing · CPC title

• A61B17/221 Primary

  Gripping devices in the form of loops or baskets {for gripping calculi or similar types of obstructions (surgical snare instruments A61B17/32056)} · CPC title

• A61F2230/0054

  V-shaped · CPC title

• A61B2017/2212

  having a closed distal end, e.g. a loop · CPC title

• A61F2002/018

  made from tubes or sheets of material, e.g. by etching or laser-cutting · CPC title