Embolic filters with controlled pore size

• US 9,603,692 B2
• Filed: 01/14/2013
• Issued: 03/28/2017
• Est. Priority Date: 01/30/2003
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Clubb, Thomas L., Kusleika, Richard S., Anderson, Kent D., Berrada, Marwane S.
• Primary Examiner(s): Nguyen, Victor
• Application Number:
  US13/740,619
• Publication Number:
  US 20140031855A1
• Time in Patent Office: 1,534 Days
• Field of Search: 606/127, 606/159, 606/200, 604/96.01, 604/101, 604/264.28
• US Class Current: 1/1
• CPC Class Codes: A61F 2/01 Filters implantable into blood vessels
• CPC Class Codes: A61F 2/0105 Open ended, i.e. legs gathered only at one side
• CPC Class Codes: A61F 2/0108 Both ends closed, i.e. legs gathered at both ends
• CPC Class Codes: A61F 2/013 Distal protection devices, i.e. devices placed distally in combination with another endovascular procedure, e.g. angioplasty or stenting
• CPC Class Codes: A61F 2002/018 made from tubes or sheets of material, e.g. by etching or laser-cutting
• CPC Class Codes: A61F 2230/0006 circular
• CPC Class Codes: A61F 2230/0008 elliptical or oval
• CPC Class Codes: A61F 2230/0067 conical
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2230/008 paraboloidal
• CPC Class Codes: D04B 1/16 synthetic threads
• CPC Class Codes: D04C 1/02 made from particular materials
• CPC Class Codes: D04C 3/48 Auxiliary devices
• CPC Class Codes: D10B 2509/06 Vascular grafts; stents

Abstract

A device for filtering emboli from blood flowing through a lumen defined by the walls of a vessel in a patient'"'"'s body. The device has a filter element being expandable from a collapsed configuration to an expanded configuration. The filter element includes a material having pores, and the material having pores includes cylindrical wires having at least three different diameters arranged in a pattern of graduated diameters.

Claims

1. A device for filtering emboli from a patient'"'"'s vasculature, comprising:

a filter element repositionable between a collapsed configuration and an expanded configuration, the filter element comprising a plurality of cylindrical strands woven together such that the filter element defines a plurality of pores, wherein the plurality of cylindrical strands includes a first strand consisting of a first metal filament defining a first filament diameter, and a second strand consisting of a second metal filament defining a second filament diameter, wherein the first filament diameter is greater than the second filament diameter,

wherein the plurality of cylindrical strands further includes a third strand consisting of a third metal filament defining a third filament diameter.

2. The device of claim 1, wherein the third filament diameter is different than at least one of the first filament diameter and the second filament diameter.

3. The device of claim 2, wherein the second filament diameter is greater than the third filament diameter.

4. The device of claim 1, wherein the pores are uniform in size.

5. The device of claim 1, wherein the pores are non-uniform in size.

6. The device of claim 1, wherein the filter element is self-expanding.

7. The device of claim 1, wherein the first metal filament comprises nitinol and the second metal filament comprises nitinol.