| 摘要 |
PROBLEM TO BE SOLVED: To provide an atherectomy device which is rotationally driven by an electric motor.SOLUTION: The device includes features unavailable on gas turbine-driven systems, such as the storing in memory of low/medium/high preset rotation speeds for particular models of handle 10, calculations of the amount of saline left in the IV and associated warnings when it gets sufficiently low, and automatic adjustment of the IV pump rate to a predetermined or calculated level when the rotational speed of the motor is changed. The electric motor has far more rotational inertia than a comparable gas turbine, so that the system includes a control mechanism 40 that helps prevent damage from excessive torque being applied to the distal end of the drive shaft. When an obstruction at the distal end is detected by a drop in the motor rotational speed, the motor is released and allowed to spin freely as a flywheel.SELECTED DRAWING: Figure 3 |
