Method and device for filtering body fluid

• US 20040006368A1
• Filed: 06/26/2003
• Published: 01/08/2004
• 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 7,566,338 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• CPC Class Codes: A61B 17/0057 Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect sutures A61B17/04; closing rectum or urethra near body surface A61F2/0009
• 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: A61B 2017/00575 for closure at remote site, e.g. closing atrial septum defects
• CPC Class Codes: A61B 2017/00592 Elastic or resilient implements
• CPC Class Codes: A61B 2017/00601 Implements entirely comprised between the two sides of the opening
• CPC Class Codes: A61B 2017/0061 Implements located only on one side of the opening
• CPC Class Codes: A61B 2017/00623 Introducing or retrieving devices therefor
• 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 embolic protection device 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 embolic protection device at a desired location;

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

expanding the expandable embolic protection device within the vessel at the desired location;

expanding the vessel at the treatment site by expanding the expandable treatment device, embolic particles released from the treatment site during expansion of the vessel being prevented from flowing distally through the vessel by the expanded embolic protection device.

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. A method of protecting a patient from embolization during a percutaneous procedure on 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 a removable sheath which covers the expandable filter and is slidable over the guidewire;

providing a catheter having a treatment device associated with a distal region of the catheter;

introducing the distal end of the guidewire into the patient'"'"'s vessel with the sheath covering the expandable filter, and positioning the filter downstream of a treatment site, wherein the sheath and guidewire cross the treatment site;

sliding the sheath toward the proximal end of the guidewire and removing the sheath from the vessel, wherein the expandable filter is uncovered;

deploying the filter;

advancing the catheter over the guidewire to position the treatment device at the treatment site; and

expanding the vessel at the treatment site with the treatment device, wherein embolic material is generated and captured before the expandable filter is removed from the patient'"'"'s vessel.

6. The method of claim 5 wherein the expandable filter includes a filter mesh.

7. The method of claim 5 wherein the filter is deployed before the catheter is advanced over the guidewire.

8. The method of claim 5 wherein the filter is deployed after the catheter is advanced over the guidewire.

9. The method of claim 5 wherein the filter is deployed before the vessel is expanded.

10. The method of claim 8 wherein the filter is deployed before the vessel is expanded.

11. The method of claim 5 wherein the filter is self-expanding and the step of deploying the filter comprises sliding the sheath proximally to uncover the filter.

12. A percutaneous system for treating a vessel at a region of stenosis and filtering emboli comprising:

a guidewire having proximal and distal ends, a proximal and distal region, and an expandable filter associated with the distal region;

a sheath which is shaped to receive the guidewire and retain the filter in a contracted condition, and to slidably release the filter to an expanded condition when the sheath moves toward the proximal end of the guidewire;

a catheter having a proximal and a distal end, a proximal and a distal region, and a lumen which slidably receives the guidewire, the catheter having a treatment device associated with the distal region; and

wherein, during use, the guidewire is positioned across the region of stenosis within the vessel, the filter is expanded, the vessel is expanded within the region of stenosis with the treatment device and wherein embolic material is generated and captured before the expandable filter is removed from the vessel.

13. The system of claim 12 wherein the filter is self-expanding.

14. The system of claim 12 wherein the filter comprises nitinol material.