Method of forming medical devices: intravascular occlusion devices

• US 20050203572A1
• Filed: 05/03/2005
• Published: 09/15/2005
• 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 7,572,273 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 site of stenosis within a vessel, comprising:

providing a guidewire having proximal and distal ends, a proximal and a distal region, an expandable filter associated with the distal region, and an elongate tubular member which covers the expandable filter and is slidable over the guidewire;

providing a retrieval catheter having proximal and distal ends and a lumen sized to receive the guidewire;

introducing the distal end of the guidewire into the patient'"'"'s vessel with the elongate tubular member covering the expandable filter, and positioning the filter downstream of the stenosis, wherein the elongate tubular member and guidewire cross the stenosis;

expanding the expandable filter;

removing the elongate tubular member from the vessel;

introducing a distal end of a treatment catheter into the patient'"'"'s vessel;

advancing the treatment catheter over the guidewire to the site of stenosis within the vessel;

expanding the vessel at the site of stenosis;

removing the treatment catheter from the vessel;

after the treatment catheter has been removed from the vessel introducing the distal end of the retrieval catheter into the vessel; and

advancing the retrieval catheter over the guidewire to retrieve the expandable filter, wherein embolic material is generated when the vessel is expanded and captured before the expandable filter is removed from the patient'"'"'s vessel.

2. The method of claim 1 wherein the expandable filter includes a filter mesh.

3. The method of claim 1 wherein the filter is expanded before the treatment catheter is advanced over the guidewire.

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

5. The method of claim 1 wherein the distal end of the treatment catheter is introduced into the patient'"'"'s vessel after the elongate tubular member is removed from the vessel.

6. The method of claim 1 wherein the treatment catheter has a radially expandable treatment device associated with a distal region of the treatment catheter and wherein the treatment device is expanded radially outwardly during the expanding step.

7. The method of claim 5 wherein the treatment catheter has a radially expandable treatment device associated with a distal region of the treatment catheter and wherein the treatment device is expanded radially outwardly during the expanding step.

8. The method of claim 1 wherein the step of expanding the vessel comprises urging the stenosis radially outwardly to squeeze the stenosis against a wall of the vessel.