# US 2016/0256256 A1 · Removable Embolus Blood Clot Filter and Filter Delivery Unit

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- Number: US 2016/0256256 A1
- Document ID: US20160256256A1
- Status: Published application
- Kind: A1
- Application number: 15/143,352
- Filed: 2016-04-29
- Published: 2016-09-08
- Earliest claimed: 1998-09-25
- Assignees: C. R. Bard, Inc.
- Applicants: C. R. Bard, Inc.
- Inventors: Adrian C. Ravenscroft; Stephen J. Kleshinski
- Web page: https://patentgrep.com/patent/US20160256256A1

## CPC

- A61F 2/0103: {With centering means}
- A61F 2/0105: {Open ended, i.e. legs gathered only at one side}
- A61F 2/011: {Instruments for their placement or removal}
- A61F 2002/016: {made from wire-like elements}
- A61F 2220/0008: Fixation appliances for connecting prostheses to the body
- A61F 2230/005: Rosette-shaped, e.g. star-shaped
- A61F 2230/0067: conical
- A61F 2230/008: paraboloidal
- 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 blood filter includes a hub, a plurality of legs, and a plurality of arms. Each of the legs includes a hook at a distal end thereof, a first linear segment extending substantially parallel to a hub longitudinal axis, a second linear segment extending obliquely with respect to the longitudinal axis at a first angle, and an intermediate linear segment coupled to the first and second segments, the intermediate segment extending obliquely with respect to the longitudinal axis at a second angle less than the first angle. Each of the arms has a free end closer to the longitudinal axis than the hook of each of the legs. The free ends of the arms are spaced radially transverse to the longitudinal axis at substantially the same radial distance.

## Claims

### Claim 1

A filter delivery system, comprising:
a blood filter including:
a hub disposed along a longitudinal axis;
at least one anchor projecting from the hub, the at least one anchor including a hook that penetrates a wall of the blood vessel, the hook being spaced along the longitudinal axis from the hub, and spaced a first radial distance from longitudinal axis; and
at least one locator projecting from the hub having at least a portion proximate a tip that engages the wall of the blood vessel, the tip being spaced along the longitudinal axis from the hub, and spaced a second radial distance from the longitudinal axis, the second radial distance being less than the first radial distance; and
a delivery unit including:
a first end coupled to a pusher pad via an elongate pusher, the elongate pusher having first, second, and third sections of different cross-sections between the first end and the pusher pad; and
a slotted spline disposed between any two of the first, second, and third sections, the slotted spline having a plurality of grooves extending along the longitudinal axis, the slotted spline having a reduced cross-section proximate the elongate pusher, each of the plurality of grooves receiving a portion of each of the plurality of legs of the filter.

### Claim 2 (depends on 1)

The filter delivery system according to claim 1, wherein the first end of the delivery unit comprises a handle.

### Claim 3 (depends on 1)

The filter delivery system according to claim 1, wherein the third section comprises a flexible wire having a smaller cross-section than the first and second cross-sections to assist in centering the filter in the blood vessel.

### Claim 4 (depends on 1)

The filter delivery system according to claim 1, wherein the elongate pusher comprises a Nitinol wire.

### Claim 5 (depends on 1)

The filter delivery system according to claim 1, wherein the slotted spline is located a distance from the pusher pad less than a length of the at least one anchor.

### Claim 6 (depends on 1)

The filter delivery system according to claim 1, wherein the delivery unit further comprises a delivery tube surrounding a portion of the slotted spline.