Devices and methods for removal of acute blockages from blood vessels

Patent metadata

Field	Value
Publication number	US-11446045-B2
Application number	US-201916505808-A
Country	US
Kind code	B2
Filing date	Jul 9, 2019
Priority date	Jun 13, 2014
Publication date	Sep 20, 2022
Grant date	Sep 20, 2022

Abstract

A system for assisting in the retrieval of a clot from a vessel. The system can include an outer catheter and an inner catheter disposed in a lumen of the outer catheter. The inner catheter can include a distal end, a proximal end, a distal segment, a proximal segment, and a lumen extending proximal of the distal end and terminating at a transfer port at the proximal end of the distal segment. A seal is located on the outer surface of the inner catheter distal of the transfer port, the seal capable of sealing against the lumen of the outer catheter so that aspiration applied through the outer catheter is configured to be transferred to the inner catheter.

First claim

What is claimed is:

1. A system for assisting in the retrieval of a clot from a vessel, the system comprising:
an outer catheter;
an inner catheter disposed in a lumen of the outer catheter, the inner catheter comprising:
a distal end;
a proximal end;
a distal segment;
a proximal segment; and
a lumen extending proximal of the distal end and terminating at a transfer port at the proximal end of the distal segment;
a seal located on the outer surface of the inner catheter distal of the transfer port, the seal capable of sealing against the lumen of the outer catheter so that aspiration applied through the outer catheter is configured to be transferred to the inner catheter; and
a first rotating hemostasis valve (RHV) through which aspiration is applied, wherein the outer catheter and the inner catheter are each disposed inside the RHV; and
wherein the first RHV is configured to seal around a proximal shaft of the inner catheter thereby preventing any fluid ingress or leakage during aspiration.

2. The system of claim 1 , further comprising: an actuator for selectively engaging and/or disengaging the seal.

3. The system of claim 1 , wherein the seal comprises a framework and a membrane coupled to the framework, the framework being movable between an expanded configuration and a retracted configuration, wherein the distal end of the inner catheter comprises a mouth for reception of clot.

4. The system of claim 3 , wherein the mouth is defined by an expansile tip comprising an elastic sleeve having a high elastic strain limit and a low modulus of elasticity to permit expansion by a low radial force, the sleeve being expandable in the deployed configuration to define an enlarged distal tip for reception of clot.

5. The system of claim 3 , wherein the mouth is defined by an expansile tip comprising a diameter at least about 50% larger than a central diameter of the inner catheter.

6. The system of claim 3 , wherein the distal segment includes a hinge adjacent to the mouth.

7. The system of claim 1 , wherein the seal seals the lumen between an outer surface of the inner catheter and an inner surface of the lumen of the outer catheter thereby preventing backflow of blood into a distal tip of the outer catheter.

8. The system of claim 1 , wherein the seal is located on an inside surface of the outer catheter.

9. The system of claim 1 , wherein the seal allows for suction out from a distal end of the outer catheter, and wherein the seal is positioned between the outer catheter and an outer surface of the inner catheter.

10. The system of claim 1 , wherein the seal is located against an inner surface of the lumen of the outer catheter so that aspiration applied by a syringe or a pump through outer catheter is transferrable through to the distal end of the inner catheter.

11. The system of Claim 1 , further comprising:
a second RHV configured to house a first portion of a proximal end of the microcatheter,
wherein the first RHV comprises a first branch and a second branch, the first branch comprises the proximal end of the inner catheter and the second branch comprises second portion of the microcatheter distal to the first portion.

Assignees

• Neuravi Ltd

Inventors

• Vale David
• Casey Brendan
• Gilvarry Micheal
• Mcardle Kevin
• Holian Maeve
• Hardiman David
• Keane Alan
• King Daniel

Classifications

• A61M1/84

  Drainage tubes; Aspiration tips (for negative pressure wound therapy A61M1/90; for surgical cutting instruments A61B17/32) · CPC title

• A61B17/22

  Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for · CPC title

• A61B17/221

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

• A61M2210/12

  Blood circulatory system · CPC title

• A61B2017/22067

  Blocking; Occlusion (A61B2017/22054 takes precedence) · CPC title