# US 2014/0277086 A1 · Umbrella inferior vena cava filter retrieval device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0277086 A1 - Document ID: US20140277086A1 - Status: Published application - Kind: A1 - Application number: 14/199,473 - Filed: 2014-03-06 - Published: 2014-09-18 - Earliest claimed: 2013-03-14 - Assignees: Cook Medical Technologies LLC - Applicants: Cook Medical Technologies LLC - Inventors: David Hagan - Web page: https://patentgrep.com/patent/US20140277086A1 ## CPC - A61B 17/50: Instruments {, other than pincettes or toothpicks,} for removing foreign bodies from the human body (surgical pincettes, i.e. surgical tweezers, A61B17/30) - A61F 2/0105: {Open ended, i.e. legs gathered only at one side} - A61B 2017/22035: {for retrieving or repositioning foreign objects} - A61F 2/011: {Instruments for their placement or removal} - A61F 2002/016: {made from wire-like elements} - A61F 2230/0093: Umbrella-shaped, e.g. mushroom-shaped - 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 device for retrieval of a vena cava filter is provided. The retrieval device has, approximately, an umbrella shape and consists of a central shaft; a plurality of frame struts, attached to frame strut attachment points on the central shaft and disposed radially about the central shaft; and a plurality of snare wires. The retrieval device has a collapsed configuration for insertion and removal from a blood vessel of a patient and an expanded state for capturing an intravascular filter in the blood vessel of the patient. The plurality of snare wires provides multiple points at which a vena cava filter, particularly one that has become misaligned during deployment or treatment, can be caught. The frame struts can be substantially sinusoidal in shape and made of shape memory metal, such as Nitinol. The snare wires can be made of a biocompatible material such as silk, polyester, polypropylene, or nylon. ## Claims ### Claim 1 A retrieval device for an intravascular filter, the retrieval device comprising: a central shaft extending from a first proximal end to a first distal end defining a first longitudinal axis; a plurality of frame struts, each strut of the plurality of frame struts extending from a first end to a second end defining a strut length, the second ends being attached to frame strut attachment points on the central shaft and being disposed radially about the central shaft; and a plurality of snare wires, each snare wire of the plurality of snare wires connected to each of the frame struts at intervals along the strut lengths, wherein the retrieval device has a collapsed configuration for insertion and removal from a blood vessel of a patient and an expanded state for capturing an intravascular filter in the blood vessel of the patient. ### Claim 2 (depends on 1) The retrieval device of claim 1 further comprising a sheath disposed about the central shaft, the sheath configured to move distally longitudinally relative to the central shaft to move the retrieval device from the collapsed state to the expanded state. ### Claim 3 (depends on 2) The retrieval device of claim 2 further comprising a plurality of retraction struts, each of the retraction struts extending from a first connected end to a second connected end, each of the first connected ends being attached to the sheath at retraction strut attachment points that are proximal to the frame strut attachment points, each of the second connected ends being attached to a frame strut of the plurality of frame struts, wherein the sheath is configured to move distally longitudinally relative to the central shaft to cause the retraction struts to move the first ends of the frame struts radially outwardly from the central shaft. ### Claim 4 (depends on 1) The retrieval device of claim 1 wherein the central shaft is made of steel. ### Claim 5 (depends on 1) The retrieval device of claim 1 wherein each frame strut of the plurality of frame struts is substantially sinusoidal in shape. ### Claim 6 (depends on 1) The retrieval device of claim 1 wherein the struts are made of shape memory metal. ### Claim 7 (depends on 6) The retrieval device of claim 6 wherein the shape memory metal is Nitinol. ### Claim 8 (depends on 1) The retrieval device of claim 1 wherein the strut attachment points are substantially a same distance from the first distal end of the central shaft along the first longitudinal axis. ### Claim 9 (depends on 1) The retrieval device of claim 1 wherein the snare wires are attached to the frame struts at points substantially equidistant from the central shaft ### Claim 10 (depends on 1) The retrieval device of claim 1 wherein each snare wire of the plurality of snare wires is made of a biocompatible material comprising at least one of silk, polyester, polypropylene, or nylon. ### Claim 11 A retrieval device assembly for retrieving an intravascular filter, the retrieval device comprising: a central shaft extending from a first proximal end to a first distal end defining a first longitudinal axis; a plurality of frame struts, each strut of the plurality of frame struts extending from a first end to a second end defining a strut length, the second ends being attached to frame strut attachment points on the central shaft and being disposed radially about the central shaft; and a plurality of snare wires, each snare wire of the plurality of snare wires connected to each of the frame struts at intervals along the strut lengths, wherein the retrieval device has a collapsed configuration for insertion and removal from a blood vessel of a patient and an expanded state for capturing an intravascular filter in the blood vessel of the patient, and wherein the retrieval device is disposed within an interior lumen of an outer sheath assembly, the outer sheath extending from a second proximal and a second distal end defining a second longitudinal axis, the retrieval device being configured to move along the second longitudinal axis. ### Claim 12 (depends on 11) The retrieval device assembly of claim 11 wherein the retrieval device further comprises a plurality of retraction struts, each of the retraction struts extending from a first connected end to a second connected end, each of the first connected ends being attached to the sheath at retraction strut attachment points that are proximal to the frame strut attachment points, each of the second connected ends being attached to a frame strut of the plurality of frame struts, wherein the sheath is configured to move distally longitudinally relative to the central shaft to cause the retraction struts to move the first ends of the frame struts radially outwardly from the central shaft. ### Claim 13 (depends on 12) The retrieval device assembly of claim 12 wherein each frame strut of the plurality of frame struts is substantially sinusoidal in shape. ### Claim 14 (depends on 12) The retrieval device assembly of claim 12 wherein the struts are made of shape memory metal. ### Claim 15 (depends on 14) The retrieval device assembly of claim 14 wherein the shape memory metal is Nitinol. ### Claim 16 (depends on 12) The retrieval device assembly of claim 12 wherein the strut attachment points of the retrieval device are substantially a same distance from the first distal end of the central shaft along the first longitudinal axis. ### Claim 17 (depends on 12) The retrieval device assembly of claim 12 wherein the snare wires are attached to the frame struts at points substantially equidistant from the central shaft ### Claim 18 A method for retrieving an intravascular filter from a vessel of a patient, the method comprising: percutaneously inserting a retrieval assembly into a target body vessel, an intravascular retrieval device being positioned in its collapsed configuration and slidably disposed within an interior lumen of the retrieval cannula; identifying the location of the filter using visualization technology; advancing the retrieval assembly still in its collapsed configuration to a retrieval position proximal to the intravascular filter in the body vessel, the retrieval position being distal to a retrieval hook of the intravascular filter; expanding the retrieval device into its expanded state; engaging the retrieval hook of the intravascular filter with a snare wire of the retrieval device; returning the retrieval device, still engaged with the retrieval hook, to its collapsed configuration; withdrawing the retrieval device and the intravascular filter into the interior lumen of the retrieval assembly; and removing the retrieval assembly and the intravascular filter from the body vessel.