Method and device for filtering body fluid

• US 20050216051A1
• Filed: 05/03/2005
• Published: 09/29/2005
• Est. Priority Date: 07/08/1994
• Status: Active Grant

• Current Assignee: ev3, Inc. (Medtronic Plc)
• Original Assignee: ev3, Inc. (Medtronic Plc)
• Inventors: Mazzocchi, Rudy, Claude, Timothy, Segermark, James
• Granted Patent: US 7,828,815 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• CPC Class Codes: A61B 17/12022 Occluding by internal devices, e.g. balloons or releasable wires plugging an opening in the wall of an organ A61B17/0057; occluders for the cervical canal A61F6/146; vas deferens occluders A61F6/20
• CPC Class Codes: A61B 17/12099 characterised by the location of the occluder
• CPC Class Codes: A61B 17/12109 in a blood vessel
• CPC Class Codes: A61B 17/12136 Balloons
• CPC Class Codes: A61B 17/12172 having a pre-set deployed three-dimensional shape methods of manufacturing A61B2017/00526
• CPC Class Codes: A61B 17/12177 comprising additional materials, e.g. thrombogenic, having filaments, having fibers or being coated
• CPC Class Codes: 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
• CPC Class Codes: A61B 2017/00526 Methods of manufacturing
• CPC Class Codes: A61F 2/0105 Open ended, i.e. legs gathered only at one side
• CPC Class Codes: A61F 2/011 Instruments for their placement or removal
• CPC Class Codes: A61F 2002/016 made from wire-like elements
• CPC Class Codes: A61F 2230/0006 circular
• CPC Class Codes: A61F 2230/0067 conical
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2230/0078 hyperboloidal
• CPC Class Codes: A61F 2230/008 paraboloidal
• CPC Class Codes: B21F 45/008 of medical instruments, e.g. stents, corneal rings medical science A61

Abstract

Medical devices for filtering fluids flowing through a lumen and a method of forming medical devices. The devices can be used in vascular channels, urinary tracts, biliary ducts and the like, and filter emboli and other debris generated at a treatment site.

Claims

1. A method of protecting a patient from embolization during a percutaneous procedure at a treatment site within a vessel comprising:

introducing a first elongate member into the vessel at a vessel access location, the first elongate member having an expandable filter carried on a distal portion thereof;

introducing a second elongate member into the vessel at the vessel access location, the second elongate member having an expandable treatment device carried on a distal portion thereof;

advancing the first elongate member through the vessel to position the expandable filter downstream of the treatment site;

advancing the second elongate member through the vessel to position the expandable treatment device within the treatment site;

expanding the expandable filter within the vessel;

expanding the treatment device radially outwardly at the treatment site, embolic particles released from the treatment site being prevented from flowing distally through the vessel by the expanded filter.

2. The method of claim 1 wherein the first elongate member is introduced into the vessel separately from the second elongate member.

3. The method of claim 1 wherein the first elongate member is advanced through the vessel independently of the second elongate member.

4. The method of claim 1 wherein the second elongate member includes a lumen sized to slideably accommodate the first elongate member and wherein the second elongate member is advanced through the vessel to the treatment site over the first elongate member.

5. The method of claim 1 wherein at least a portion of the expandable filter is self-expandable.

6. The method of claim 1 wherein the treatment site is a stenosis and wherein the step of expanding the vessel comprises urging the stenosis radially outwardly to squeeze the stenosis against a wall of the vessel.

7. The method of claim 1 further comprising:

removing the second elongate member from the vessel;

after the second elongate member has been removed from the vessel introducing a distal end of an elongate retrieval member into the vessel, the elongate retrieval member having a lumen sized to receive the first elongate member;

advancing the elongate retrieval member through the vessel over the first elongate member to retrieve the expandable filter; and

removing the elongate retrieval member, first elongate member and expandable filter from the vessel.

8. The method of claim 1 wherein the first elongate member is a guidewire.