Filter flush system and methods of use

• US 8,444,665 B2
• Filed: 07/17/2003
• Issued: 05/21/2013
• Est. Priority Date: 08/04/1999
• Status: Expired due to Fees

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Tsugita, Ross S.
• Primary Examiner(s): Jackson, Gary
• Assistant Examiner(s): BLATT, ERIC D
• Application Number:
  US10/621,972
• Publication Number:
  US 20040006370A1
• Time in Patent Office: 3,596 Days
• Field of Search: 606/200, 606/192, 623/1.12, 623/1.11
• 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 17/12109 in a blood vessel
• CPC Class Codes: A61B 17/12136 Balloons
• CPC Class Codes: A61B 17/22 Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for dilators A61M29/00
• 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 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• 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 2230/0067 conical
• CPC Class Codes: A61F 2230/008 paraboloidal
• CPC Class Codes: A61F 2230/0093 Umbrella-shaped, e.g. mushroom-shaped
• CPC Class Codes: A61M 2025/09175 having specific characteristics at the distal tip
• CPC Class Codes: A61M 2025/1052 for temporarily occluding a vessel for isolating a sector
• CPC Class Codes: A61M 25/0662 Guide tubes

Abstract

A filter flush system for temporary placement of a filter in an artery or vein is disclosed. The system typically includes a guidewire insertable within a guiding catheter, which has an occlusion balloon disposed about its distal end. The guidewire has an expandable filter, which can be collapsed to pass through a lumen and distal port of the guiding catheter. The lumen is adapted to receive a variety of endovascular devices, including angioplasty, atherectomy, and stenting catheters. Fluid medium or blood can be infused through the lumen of the guiding catheter to flush embolic material or mobile plaque generated during the endovascular procedures toward the expanded filter deployed downstream from the region of interest. Methods of using the filter flush system to entrap and remove embolic material from the vessel are also disclosed.

Claims

1. A medical device for use in a body lumen, the device comprising:

a first catheter shaft having a proximal end region, a distal end region, and a fluid lumen connecting the proximal end region and the distal end region;

a second catheter shaft slidably disposed within the first catheter shaft;

a guidewire slidably disposed in a lumen of the second catheter shaft;

a filter coupled to the guidewire;

a balloon coupled to the distal end region of the first catheter shaft;

a stent disposed adjacent the second catheter shaft,

wherein the balloon and the first catheter shaft are configured to stop fluid outside of the first catheter shaft proximal to the balloon from flowing distally past the distal region of the shaft when the balloon is expanded;

wherein the stent is self-expanding and configured to be deployed from a position between the distal end of the first catheter shaft and the filter; and

wherein the first catheter shaft defines a perfusion lumen configured for the passage of perfusing fluid supplied at the proximal end region therethrough so as to flush embolic debris into the filter.

2. The medical device of claim 1, wherein the second catheter shaft comprises a distal balloon and the stent is disposed about the distal balloon.

3. The medical device of claim 1, wherein the stent is disposed on the second catheter shaft.

4. The medical device of claim 3, wherein the stent is configured to shift between a first generally collapsed configuration and a second generally expanded configuration, and wherein the stent is self-biased to be in the second configuration.

5. The medical device of claim 4, wherein the stent is retained in the first configuration on the second catheter shaft by a retaining sleeve.

6. The medical device of claim 4, wherein the stent is retained in the first configuration on the second catheter shaft by the first catheter shaft.

7. The medical device of claim 4, wherein the self-biased stent is thermally activated.

8. The medical device of claim 1, wherein the device includes a perfusing fluid.

9. The medical device of claim 8, wherein the perfusing fluid is blood.

10. The medical device of claim 8, wherein the perfusing fluid is oxygenated.

11. The medical device of claim 1, wherein the first catheter shaft includes an infusion port within the proximal end region and proximal the balloon.

12. The medical device of claim 11, wherein the infusion port is configured to introduce blood into the perfusion lumen.

13. The medical device of claim 8, wherein the perfusion lumen is configured to direct the perfusing fluid at an inner surface of the body lumen.

14. The medical device of claim 1, wherein the device includes an aspiration catheter configured to remove embolic debris from the filter while the filter is percutaneously disposed in the body lumen.

15. The medical device of claim 14, wherein the aspiration catheter in configured to be slidably disposed in the first catheter shaft.

20. The medical device of claim 1, further comprising an aspiration catheter configured for slidable insertion in the first catheter shaft.

16. A medical device for use in a body lumen, the device comprising:

an outer catheter shaft having a proximal end and a distal end;

an inner catheter shaft slidably disposed in the outer catheter shaft, said inner catheter shaft having a proximal end and a distal end;

an elongate guidewire slidably disposed in the inner catheter shaft;

a filter coupled to the guidewire;

a balloon coupled to the outer catheter shaft; and

a self-expanding stent coupled to the inner catheter shaft,

wherein the balloon and the outer catheter shaft are configured to stop fluid from outside the outer catheter shaft proximal to the balloon from flowing distally past the balloon when the balloon is expanded; and

wherein at least one of the inner or outer catheter shafts define a perfusion lumen therein that is configured for perfusing fluid therethrough from an infusion port proximate the proximal end of the shaft so as to flush embolic debris into the filter.

17. The medical device of claim 16, wherein the stent is configured to shift between a first generally collapsed configuration and a second generally expanded configuration, and wherein the stent is biased to be in the second configuration.

18. The medical device of claim 17, wherein the stent is retained in the first configuration on the inner catheter shaft by a retaining sleeve.

19. The medical device of claim 17, wherein the stent is retained in the first configuration on the inner catheter shaft by the outer catheter shaft.

21. The medical device of claim 16, further comprising an aspiration catheter configured for slidable insertion in the outer catheter shaft.

22. The medical device of claim 16, further comprising an aspiration catheter configured for slidable insertion in the inner catheter shaft.