| 摘要 |
PROBLEM TO BE SOLVED: To avoid damage to a patient or to an atherectomy device.SOLUTION: An atherectomy device is disclosed, with a clutch between a motor and a drive shaft. The clutch includes two plates that rely on friction to transmit torque from one plate to the other. The clutch has an attractive magnetic normal force that holds the plates together. For relatively low torques, as is the case during normal use, a static frictional torque holds the plates together, and the plates spin together without slipping. For relatively high torques, as occurs when the distal end of the drive shaft encounters an obstacle and stops abruptly, the high torque exceeds the maximum possible static frictional torque, and the plates slip. When slipping, the plates transmit a kinetic frictional torque that is low enough to avoid damage to the patient or to the atherectomy device. |
