Methods and devices for removing material from a body lumen
A debulking catheter comprising a debulking assembly for debulking a body lumen. The catheters of the present invention can include a flexible proximal portion coupled to a rigid distal portion. A tissue debulking assembly can be disposed within the rigid portion to debulk the body lumen. In exemplary embodiments, the rigid portion is rotatably coupled to the flexible portion such that rotation or deflection of the rigid portion, relative to the flexible portion, can expose the tissue debulking assembly through a window in the catheter to debulk the body lumen.
1. A method of removing material from a body lumen, the method comprising:
delivering a catheter comprising a tissue debulking device to a target site in the body lumen;
deflecting a distal portion of the catheter relative to a proximal portion of the catheter to expose the tissue debulking device through a cutting window, the deflecting step being carried out by sliding the tissue debulking device against a cam surface to expose the tissue debulking device through the cutting window; and
debulking the body lumen by rotating the tissue debulking device about a first axis with the tissue debulking device being exposed through the cutting window in the catheter, the debulking step being carried out by advancing the catheter in the body lumen to move the rotating tissue debulking device and cutting window through material in the body lumen during the debulking step.
2. The method of claim 1 wherein the first axis is a longitudinal axis of the catheter.
3. The method of claim 1 further comprising packing severed material into a collection chamber.
4. The method of claim 1 wherein deflecting comprises urging the tissue debulking device against the material in the body lumen.
5. The method of claim 1 wherein delivering comprises attaching a guidewire to a monorail delivery assembly on the catheter.
6. The method of claim 1 wherein the target site is a stent.
7. The method of claim 1 wherein deflecting is carried out by moving the tissue debulking device from a first position to a second position.