Method and device for filtering body fluid

• US 7,566,338 B2
• Filed: 06/26/2003
• Issued: 07/28/2009
• Est. Priority Date: 07/08/1994
• Status: Expired due to Fees

• Current Assignee: ev3, Inc. (Medtronic Plc)
• Original Assignee: ev3, Inc. (Medtronic Plc)
• Inventors: Mazzocchi, Rudy, Claude, Timothy, Segermark, James
• Primary Examiner(s): Bui; Vy Q
• Application Number:
  US10/607,328
• Publication Number:
  US 20040006368A1
• Time in Patent Office: 2,224 Days
• Field of Search: 606/200, 606/108, 606/191, 606/194, 623/1.11
• 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 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;

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;

expanding the expandable filter in the vessel;

removing the sheath from the vessel;

advancing a treatment catheter over the guidewire to position the treatment catheter at the treatment site, the treatment catheter having a distal portion carrying an expandable treatment device, the treatment device being expandable from an unexpanded configuration where an outer wall of the treatment device has a first diameter to an expanded configuration where the outer wall has a second diameter, the second diameter being greater than the first diameter; and

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

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

3. The method of claim 1 wherein the filter is deployed before the vessel is expanded.

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 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.

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

7. The method of claim 6 wherein the filter mesh comprises a metal.

8. The method of claim 7 wherein the metal comprises nitinol.

9. The method of claim 1 wherein the filter comprises metal.

10. The method of claim 9 wherein the metal comprises nitinol.

11. 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 including a radially expandable member associated with the distal region, the radially expandable member being expandable from a delivery configuration where an outer wall of the treatment device has a first diameter to an expanded configuration where the outer wall has a second diameter, the second diameter being greater than the first diameter; 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 radially expandable member of the treatment device and wherein embolic material is generated and captured before the expandable filter is removed from the vessel.

12. The system of claim 11 wherein at least a portion of the filter is self-expanding.

13. The system of claim 11 wherein the filter comprises metal.

14. The system of claim 13 wherein the metal comprises nitinol.

15. The system of claim 11 wherein the filter comprises a filter mesh.

16. The system of claim 15 wherein the filter mesh comprises a metal.

17. The system of claim 16 wherein the metal comprises nitinol.