Devices and methods for crossing a chronic total occlusion

摘要

A catheter (10) comprising an elongate tubular member having a proximal end and a distal end, and a delectable tip (11) at the distal end of the elongate tubular member. The delectable tip comprises a first helical coil (15) having a first diameter and a second helical coil (14) having a second diameter, the first diameter being larger than the second diameter. The first and second helical coils are arranged in a manner of a double helix. When viewed in cross-section, the first helical coil and the second helical coil are aligned at a first point on a circumference of each coil and misaligned at a second point on the circumference of each coil, where the second point is approximately 180 degrees from the first point. In certain embodiments the catheter further includes a dilatation balloon (81).