主权项 |
1. An atherectomy catheter device having a multi-channeled bushing, the device comprising:
an elongate body; a tip extending from a distal end of the elongate body; a drive shaft extending within the elongate body; a bushing comprising
a bushing body,a hinge point on a side of the bushing body,a first channel extending proximally to distally through the bushing body,a second channel extending proximally to distally through the bushing body, overlapping with the first channel and having a diameter of the second channel that is less than a diameter of the first channel, and wherein the second channel is angled between 1° and 45° relative to the first channel,a first opening at a distal end of the bushing body into the first channel, anda second opening at the distal end of the bushing body into the second channel, wherein the first and second openings overlap; and a cutter having a distal cutting head with a cutting edge, an elongate cylindrical body, and a neck region extending between the distal cutting edge and the elongate cylindrical body, wherein the drive shaft is coupled to the elongate cylindrical body; further wherein distal movement of the drive shaft extends the cylindrical body of the cutter within the first channel of the bushing and drives the tip about the hinge point to axially align the tip with the elongate body and at least partially cover the cutting edge, while proximal movement of the drive shaft extends the neck region of the cutter within the second channel of the bushing and drives the tip about the hinge point to angle the tip relative to the elongate body and at least partially expose the cutting edge. |