KEVIN W. SMITH,THOMAS O. BALES, JR.,DEREK DEE DEVILLE,CARLOS RIVERA,MATTHEW A. PALMER
申请号：
US13863978
公开号：
US20130284789A1
申请日:
2013.04.16
申请国别(地区):
US
年份:
2013
代理人:
摘要：
A surgical instrument includes an end effector, an actuator coupled to the end effector and actuating it, a handle coupled to the end effector and having an electric motor disposed therein actuating the actuator when supplied with power, and a post-termination braking circuit including a power supply switch at the handle. The switch has a break-before-make configuration, a power-supplying state in which power is supplied to the motor, and a power-removed state in which power is not supplied to the motor. The braking circuit short-circuits power to the motor when the switch is in the power-removed state. A method for post-termination braking of the motor utilizes the permanent magnetic field to counteract inertia-induced over-stroke of the motor, drive train, and/or actuation assembly after powered operation by short-circuiting the still-spinning motor to create an electrically generated magnetic field in opposition to the permanent magnetic field upon ceasing supply of power.
