Weeping balloon catheter

摘要

Balloon catheters, and methods of treatment therewith, are provided including an inflatable first balloon at least partially enclosed by an expandable second balloon that has holes. The annular space between the first balloon and the second balloon is configured to promote delivery of the fluid evenly through holes in the second balloon to avoid problems of underloading and/or overloading. Preferably, the annular space is in communication with the holes, and the annular space is configured to receive and then to release and distribute the fluid via the holes in a substantially uniform manner such that even amounts of fluid are released in the distal and proximal holes. The first balloon may have various configurations including being tapered relative to the second balloon. The second balloon may also be tapered accordingly. The device may also include raised portions disposed in the annular space and configured to define channels having various configurations.

主权项

1. A balloon catheter comprising:
a catheter shaft extending along a longitudinal axis;a first balloon mounted on the catheter shaft, the first balloon having a middle working region;a second balloon mounted around at least a portion of the first balloon, the second balloon having a middle working length, and a plurality of holes formed in the middle working length to define a perforated portion; anda plurality of raised portions coupled to an outer surface of the first balloon, each of the first and second balloons movable to an expanded configuration to define a plurality of channels disposed between adjacent raised portions and the first and second balloons, the channels being in communication with the plurality of holes of the second balloon;wherein the channels comprise an annular working region disposed between the perforated portion of the middle working length of the second balloon and a corresponding portion of the middle working region of the first balloon, andwherein each of the raised portions are interconnected by a web along the outer surface of the first balloon, the web having an increasingly larger cross-sectional area along the longitudinal axis in a distal direction.