# US 2014/0155930 A1 · Inferior filter retrieval device

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- Number: US 2014/0155930 A1
- Document ID: US20140155930A1
- Status: Published application
- Kind: A1
- Application number: 13/693,175
- Filed: 2012-12-04
- Published: 2014-06-05
- Earliest claimed: 2012-12-04
- Assignees: Cook Medical Technologies LLC
- Applicants: Cook Medical Technologies LLC
- Inventors: Jonathan L. Bennett; Robert Eells; Jeffry S. Melsheimer; Shavonna Warren
- Web page: https://patentgrep.com/patent/US20140155930A1

## CPC

- A61F 2/011: {Instruments for their placement or removal}
- A61F 2/0105: {Open ended, i.e. legs gathered only at one side}
- A61B 2017/00358: {Snares for grasping}
- A61B 2017/22035: {for retrieving or repositioning foreign objects}
- A61F 2/9517: {handle assemblies therefor}
- A61F 2250/0097: Visible markings, e.g. indicia
- 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)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A device for inferior retrieval of a vena cava filter includes an outer sheath with a first radial window closer to the distal end than the proximal end of the outer catheter; an inner sheath generally extending movably inside the lumen of the outer sheath and having a second radial window; and a snare tool having an elongated guide element extending through the inner sheath and a snare loop distally attached to the guide element. The snare loop is extendable outward through the two radial windows.

## Claims

### Claim 1

A device for inferior retrieval of a vena cava filter, the device comprising:
an outer sheath with a first lumen longitudinally extending from a first proximal end to a first distal end, the outer sheath having a first radial window between the first proximal end and the first distal end, the first radial window being closer to the first distal end than the first proximal end;
an inner sheath generally extending movably inside the lumen of the outer sheath, the inner sheath having a lumen extending from a second proximal end to a second distal end; and
a snare tool having an elongated guide element extending through the inner sheath and a snare distally attached to the guide element, the snare extendable outward from an opening in the inner sheath and outward through the first radial window in the outer sheath.

### Claim 2 (depends on 1)

The device according to claim 1, wherein the opening in the inner sheath is a second radial window between the second proximal end and the second distal end, the second radial window being closer to the second distal end than the second proximal end.

### Claim 3 (depends on 2)

The device according to claim 2, wherein the second radial window is generally shaped like a half-oval.

### Claim 4 (depends on 2)

The device according to claim 2, wherein the second radial window has an edge with a flared edge portion that extends at least across a distal portion of the edge.

### Claim 5 (depends on 4)

The device according to claim 4, wherein the flared edge portion protrudes outward from the first radial window when the flared edge portion resides in a longitudinal and angular position within the first radial window.

### Claim 6 (depends on 1)

The device according to claim 1, wherein the first radial window is an oval cutout.

### Claim 7 (depends on 6)

The device according to claim 6, wherein the oval cutout extends circumferentially across about half of the circumference of the first sheath.

### Claim 8 (depends on 1)

The device according to claim 1, wherein the snare has a relaxed shape, in which the snare loop forms a radially deflected loop.

### Claim 9 (depends on 8)

The device according to claim 8, wherein the snare tool further comprises a snare hub having a proximal end distally attached to the elongated guide and securing the snare loop to the elongated guide.

### Claim 10 (depends on 1)

The device according to claim 1, wherein the snare loop extends from the proximal end of the snare hub.

### Claim 11 (depends on 2)

The device according to claim 2, wherein the inner sheath is configured to be longitudinally moved relative to the outer sheath.

### Claim 12 (depends on 1)

The device according to claim 1, inner sheath is configured to be rotationally moved relative to the outer sheath.

### Claim 13 (depends on 1)

The device according to claim 1, further comprising a first handle proximally attached to the outer sheath, a second handle with an axial channel proximally attached to the inner sheath, and a third handle proximally attached to the snare tool, the second and third handles configured to be longitudinally and rotationally manipulated relative to the first handle and to each other.

### Claim 14 (depends on 13)

The device according to claim 13, further comprising angular markings on at least one of the first handle, the second handle, and the third handle for angular alignment of at least one of the first radial window, the second radial window, and the snare tool.

### Claim 15 (depends on 1)

The device according to claim 1, further comprising at least one marker distinguishable by imaging on at least one of the outer sheath, the inner sheath, and the snare tool.

### Claim 16

A method of removing an implantable device having proximally extending radially collapsible struts, a distal hub and a removal hook distally attached to the hub, the method comprising the steps of:
providing an outer sheath with a first lumen longitudinally extending from a first proximal end to a first distal end, the outer sheath having a first radial window between the first proximal end and the first distal end, the first radial window being closer to the first distal end than the first proximal end;
providing an inner sheath generally extending inside the lumen of the outer sheath, the inner sheath having a lumen extending from a second proximal end to a second distal end, the inner sheath having a second radial window between the second proximal end and the second distal end; and
providing a snare tool having an elongated guide element extending through the inner sheath and a snare loop distally attached to the guide element;
advancing the outer sheath, the inner sheath and the snare tool distally past the removal hook of the implantable device until the first radial opening is positioned distally from the implantable device;
aligning the first and second radial openings to obtain an overlap with each other;
extending the snare loop outward through the first and second radial openings;
engaging the removal hook with the snare loop;
distally moving the snare tool relative to the outer and inner sheaths so as to distally pull the implantable device into the inner sheath until the proximal struts are substantially accommodated within the inner sheath;
moving the inner sheath relative to the outer sheath until the overlap between the first radial opening and the second radial opening is substantially reduced; and
proximally withdrawing the outer sheath along with the inner sheath, the snare tool and the implantable device.

### Claim 17 (depends on 16)

The method of claim 16, wherein the inner sheath is moved relative to the outer sheath by a rotational relative movement.

### Claim 18 (depends on 16)

The method of claim 16, wherein the inner sheath is moved relative to the outer sheath by a longitudinal relative movement.