# US 11,439,418 B2 · Clot retrieval device for removing clot from a blood vessel

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- Number: US 11,439,418 B2
- Document ID: US11439418B2
- Status: Granted
- Kind: B2
- Application number: 16/946,467
- Filed: 2020-06-23
- Published: 2021-12-23
- Granted: 2022-09-13
- Earliest claimed: 2020-06-23
- Assignees: Neuravi Limited
- Applicants: Neuravi Limited
- Inventors: Thomas O'Malley; Aidan Duffy; Declan Lee; AnnaLisa Smullin; Gillian Gunning; Diarmaid O'Keeffe
- Web page: https://patentgrep.com/patent/US11439418B2

## CPC

- 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)}
- A61B 90/39: {Markers, e.g. radio-opaque or breast lesions markers}
- A61B 2017/22034: {for gripping the obstruction or the tissue part from inside}
- A61B 2017/2212: {having a closed distal end, e.g. a loop}
- A61B 2017/2215: {having an open distal end}
- A61B 2090/3966: {Radiopaque markers visible in an X-ray image}
- A61F 2/013: {Distal protection devices, i.e. devices placed distally in combination with another endovascular procedure, e.g. angioplasty or stenting}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

A clot retrieval device is disclosed to remove clot from a blood vessel. The device can include a collapsed configuration and an expanded configuration. The device can include an inner expandable body with a framework of struts. The device can include an outer expandable body with a framework of struts that at least partially radially surrounding the inner expandable body. A distal portion of the outer expandable body can extend in the deployed configuration towards the outer expandable body to a greater extent than the inner expandable body, closed cells of the distal portion distally tapering and being smaller than cells proximal thereof in the outer expandable body. The plurality of closed cells of the distal portion can include a pair of axially aligned smaller diamond shaped cells formed by struts of the distal portion and positioned along upper and lower regions of the distal portion.

## Claims

### Claim 1

A clot retrieval device to remove a clot from a blood vessel, the device comprising a collapsed configuration and an expanded configuration and comprising:
an inner expandable body comprising a framework of struts that form closed cells; and
an outer expandable body comprising a framework of struts that form closed cells larger than the closed cells of the inner expandable body and at least partially radially surrounding the inner expandable body, the outer expandable body comprising a distal scaffolding zone comprising a plurality of struts that distally taper with closed cells smaller than cells proximal thereof in the outer expandable body;
the plurality of closed cells of the distal scaffolding zone comprising:
a radially aligned and joined group of a first plurality of closed cells being axially aligned small diamond shaped cells formed by struts of the distal scaffolding zone;
a radially aligned and joined group of a second plurality of closed cells being larger than cells of the first plurality of pentagon-shaped closed cells and radially separated, each small diamond shaped cell being radially inward, distal, and adjacent to the second plurality of closed cells; and
a third plurality of closed cells radially separated and proximal of each of the second plurality of closed cells;
wherein each of the second plurality of closed cells share common edges with two of the first plurality of closed cells; and
wherein each of the first plurality of closed cells share common edges with two of the second plurality of closed cells.

### Claim 2 (depends on 1)

The device of claim 1, the first plurality of closed cells comprising a different shape than the second plurality of cells; and
the second plurality of closed cells comprising a different shape than the third plurality of closed cells.

### Claim 3 (depends on 1)

The device of claim 1, the distal scaffolding zone being a protective strut structure comprising at least twelve closed cells between the first, second, and third plurality of closed cells.

### Claim 4 (depends on 1)

The device of claim 1, the first plurality of closed cells being a pair of axially aligned small diamond shaped cells formed by struts of the distal portion and positioned along upper and lower regions of the distal scaffolding zone.

### Claim 5 (depends on 4)

The device of claim 4, each diamond shaped cell comprising a best fit diameter of approximately 1.2 mm.

### Claim 6 (depends on 4)

The device of claim 4, the second plurality of closed cells comprising at least four cells.

### Claim 7 (depends on 6)

The device of claim 6, the at least four cells comprising a best fit diameter of approximately 1.6 mm.

### Claim 8 (depends on 6)

The device of claim 6, each of the at least four cells sharing only one common edge with one of the small diamond shaped cells.

### Claim 9 (depends on 6)

The device of claim 6, the third plurality of closed cells comprising at least five radially separated cells proximal of the second plurality of cells.

### Claim 10

A clot retrieval device to remove a clot from a blood vessel, the device comprising a collapsed configuration and an expanded configuration, and comprising:
an inner expandable body comprising a framework of struts; and
an outer expandable body comprising a framework of struts that at least partially radially surround the inner expandable body; and
a distal portion of the outer expandable body that extends in a radially outward direction in the expanded configuration, wherein small diamond shaped closed cells of the distal portion distally taper and are smaller than pentagon-shaped large closed cells adjacent proximal thereof;
the small diamond shaped closed cells of the distal portion comprising axially aligned cells formed by struts of the distal portion and positioned along upper and lower regions of the distal portion; and
wherein each of small diamond shaped closed cells share common edges with two of the large closed cells; and
wherein each of the large closed cells share common edges with two of the small diamond shaped closed cells.

### Claim 11 (depends on 10)

The device of claim 10, wherein the distal portion being a protective strut structure comprises at least twelve closed cells.

### Claim 12 (depends on 10)

The device of claim 10, wherein the large pentagon-shaped closed cells of the distal portion comprises at least four radially separated large cells, each small diamond shaped cell being radially inward and distal of the at least four radially separated large cells.

### Claim 13 (depends on 12)

The device of claim 12, wherein the at least four radially separated large cells comprise a best fit diameter of approximately 1.6 mm.

### Claim 14 (depends on 12)

The device of claim 12, wherein each of the at least four radially separated large cells share only one common edge with one of the small diamond shaped cells.

### Claim 15 (depends on 12)

The device of claim 12, wherein the closed cells of the distal portion comprise at least five radially separated cells proximal of the at least four radially separated large cells.

### Claim 16 (depends on 10)

The device of claim 10, wherein the framework of struts of the outer expandable body comprise a plurality of discontinuous expandable members spaced from adjacent expandable members, struts of each expandable forming closed cells with at least some struts terminating in radially separated distal apexes free from connection to an adjacent closed cell, each member comprising at least four radiopaque markers equally radially separated about a longitudinal axis of the outer expandable body.

### Claim 17 (depends on 16)

The device of claim 16, wherein the at least four radiopaque markers are separated approximately 10 mm apart in the collapsed configuration.

### Claim 18 (depends on 16)

The device of claim 16, wherein the at least four radiopaque markers radiopaque markers comprise at least one of Barium Sulphate, Bismuth SubCarbonate, Barium OxyChloride, Gold, Tungsten, Platinum, Iridium, Tantalum or an alloy of these materials.