Embolus removal device with blood flow restriction and related methods

• US 10,070,878 B2
• Filed: 02/15/2017
• Issued: 09/11/2018
• Est. Priority Date: 10/31/2015
• Status: Active Grant

• Current Assignee: NeuroVasc Technologies, Inc.
• Original Assignee: NeuroVasc Technologies, Inc.
• Inventors: Ma, Jianlu
• Primary Examiner(s): Miles, Jonathan
• Assistant Examiner(s): Ulsh, George J
• Application Number:
  US15/433,455
• Publication Number:
  US 20180103969A1
• Time in Patent Office: 573 Days
• Field of Search: 606159, 606200
• CPC Class Codes: A61B 17/12109 in a blood vessel
• CPC Class Codes: A61B 17/12131 characterised by the type of occluding device
• 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 2017/00867 shape memory effect for prostheses A61F2210/0014
• CPC Class Codes: A61B 2017/00893 pharmaceutically effective
• CPC Class Codes: A61B 2017/1205 Introduction devices
• CPC Class Codes: A61B 2017/22038 with a guide wire
• CPC Class Codes: A61B 2017/22079 with suction of debris
• CPC Class Codes: A61B 2017/2212 having a closed distal end, e.g. a loop
• CPC Class Codes: A61B 2017/2215 having an open distal end
• CPC Class Codes: A61B 2017/2217 single wire changing shape to a gripping configuration
• CPC Class Codes: A61B 2090/3966 Radiopaque markers visible in an X-ray image
• CPC Class Codes: A61B 90/39 Markers, e.g. radio-opaque or breast lesions markers
• CPC Class Codes: A61F 2/013 Distal protection devices, i.e. devices placed distally in combination with another endovascular procedure, e.g. angioplasty or stenting
• CPC Class Codes: A61F 2002/016 made from wire-like elements
• CPC Class Codes: A61F 2230/0067 conical
• CPC Class Codes: A61M 2025/0042 Microcatheters, cannula or the like having outside diameters around 1 mm or less
• CPC Class Codes: A61M 25/0021 characterised by the form of the tubing A61M25/0054 takes precedence

Abstract

A clot removal device has an expandable treatment member having a distal tip and a proximal end, a delivery wire having a distal end coupled to the proximal end of the expandable treatment member, and a flow restrictor carried along the delivery wire at a location that is separate and proximal from the expandable treatment member. The flow restrictor has a body with a distal section and a proximal section, the distal section being covered and the proximal section being uncovered. The expandable treatment member is moveable relative to the flow restrictor, and can be retracted into the distal section.

Claims

1. A method for removing a clot or embolus from a blood vessel, comprising:

providing a clot removal device, comprising;

an expandable treatment member having a distal tip and a proximal end;

a delivery wire having a distal end coupled to the proximal end of the expandable treatment member;

a flow restrictor carried along the delivery wire at a location that is separate and proximal from the expandable treatment member, the flow restrictor having a body with a distal section and a proximal section, the flow restrictor assuming an expanded configuration and an unexpanded configuration, wherein the distal section is covered and the proximal section is uncovered in both the expanded and unexpanded configurations;

delivering an access catheter to a location proximal to a location of a clot or embolus in a blood vessel;

delivering the clot removal device through a lumen in the access catheter to the location of the clot or embolus in the blood vessel;

expanding the expandable treatment member at a location that is at or distal to the location of the clot or embolus;

positioning the access catheter with respect to the flow restrictor such that the uncovered proximal section is completely covered by the distal end of the access catheter and the covered distal section forms a seal with the distal end of the access catheter prior to engaging the clot or embolus;

catching or engaging the clot or embolus in or with the expandable treatment member; and

applying aspiration through the access catheter and through the uncovered proximal section to remove the clot or embolus from the blood vessel.

2. The method of claim 1, further including the step of withdrawing the expandable treatment member into the distal section of the flow restrictor.

3. The method of claim 2, further including the step of withdrawing the expandable treatment member and the flow restrictor from the blood vessel.

4. The method of claim 1, wherein the uncovered proximal section has a smaller diameter than the covered distal section.

5. The method of claim 4, wherein the uncovered proximal section is tapered and the covered distal section is cylindrical.

6. The method of claim 4, wherein the expandable treatment member is configured to define a catch basket.