INTERVENTIONAL CATHETERS INCORPORATING AN ACTIVE ASPIRATION SYSTEM

• US 20110118660A1
• Filed: 05/07/2010
• Published: 05/19/2011
• Est. Priority Date: 10/04/2006
• Status: Active Grant

• Current Assignee: Boston Scientific Medical Device Limited (Boston Scientific Corporation)
• Original Assignee: Pathway Medical Technologies, Inc. (Bayer AG)
• Inventors: Salstrom, Jared, Torrance, Casey
• Granted Patent: US 8,394,078 B2
• Time in Patent Office: Days
• US Class Current: 604/35
• CPC Class Codes: A61B 17/320758 with a rotating cutting instrument, e.g. motor driven A61B17/320725, A61B17/32075 and A61B17/320783 take precedence; for removing intra-ocular material A61F9/00763; endoscopic rotatable cutting instruments A61B17/32002
• CPC Class Codes: A61B 2017/320775 Morcellators, impeller or propeller like means
• CPC Class Codes: A61B 2217/005 with suction drainage system
• CPC Class Codes: A61B 2217/007 with irrigation system

Abstract

An interventional catheter assembly comprises an operating head for removing obstructive material from a target site in a body lumen or cavity and at least one aspiration port located proximal to the operating head and penetrating the catheter assembly, the aspiration port being in communication with a sealed lumen that communicates with a vacuum system for withdrawing aspirate fluid and obstructive material from the target site. The interventional catheter incorporates an elongated guidewire lumen bushing extending proximally from a distal region of the operating head to reduce the clearance between the guidewire and the internal surface of the guidewire lumen during operation of the interventional catheter. This feature restricts entry of fluid and debris into the guidewire lumen and promotes maintenance of consistent and high aspiration pressure and volume during operation of the aspiration system and interventional catheter assembly.

Claims

1. An interventional catheter assembly comprising:

(a) an elongated tubular catheter system for navigation within a patient'"'"'s body;

(b) an operating head mounted at a distal end of the catheter system and comprising a system for removing obstructive material from a target site in a body lumen or cavity;

(c) a guidewire lumen extending through the catheter system and the operating head;

(d) at least one aspiration port in proximity to the operating head in communication with an aspiration lumen that communicates with a vacuum system for withdrawing fluid and obstructive material from the target site through the aspiration lumen; and

(e) an elongated cylindrical bushing extending through a distal portion of the guidewire lumen, the elongated cylindrical bushing extending from a distal region of the operating head proximally through a substantial portion of the operating head, thereby reducing the guidewire clearance in the region of the bushing during operation of the interventional catheter assembly over a guidewire.

2. The interventional catheter assembly of claim 1, wherein the elongated cylindrical bushing extends from a distal region of the operating head proximally through the operating head and into a distal region of the catheter system.

3. The interventional catheter assembly of claim 1, wherein the elongated cylindrical bushing terminates at a point proximal to a distal guidewire exit port.

4. The interventional catheter assembly of claim 1, wherein the elongated cylindrical bushing is dimensioned to provide clearance of less than about 0.005″

between an internal bushing surface and a recommended guidewire surface.

5. The interventional catheter assembly of claim 1, wherein the elongated cylindrical bushing is dimensioned to provide clearance of between about 0.0015″

and 0.0005″

between an internal bushing surface and a recommended guidewire surface.

6. The interventional catheter assembly of claim 1, wherein the elongated cylindrical bushing extends proximally of the at least one aspiration port.

7. The interventional catheter assembly of claim 1, further comprising at least one infusion port communicating with an infusion lumen for the infusion of fluids, wherein the elongated cylindrical bushing extends proximally of the at least one infusion port.

8. The interventional catheter assembly of claim 1, wherein the elongated cylindrical bushing has regions having different dimensions along its length.

9. The interventional catheter assembly of claim 1, wherein the elongated cylindrical bushing has an enlarged outer diameter distal region and a smaller outer diameter proximal region.

10. The interventional catheter assembly of claim 1, wherein the inner diameter of the elongated cylindrical bushing is substantially constant along its length.

11. The interventional catheter assembly of claim 1, wherein the inner diameter of the elongated cylindrical bushing varies along its length.

12. The interventional catheter assembly of claim 1, wherein the elongated cylindrical liner is formed from polyimide.