DEREK DEE DEVILLE;MATTHEW A. PALMER;KEVIN W. SMITH;THOMAS O. BALES, JR.;CARLOS RIVERA
发明人:
KEVIN W. SMITH,THOMAS O. BALES, JR.,DEREK DEE DEVILLE,CARLOS RIVERA,MATTHEW A. PALMER
申请号：
US13847971
公开号：
US20130221061A1
申请日:
2013.03.20
申请国别(地区):
US
年份:
2013
代理人:
摘要：
An electrically powered surgical instrument includes a surgical end effector having a surgical procedure effecting actuation assembly. A handle is coupled with the end effector. An electric motor is disposed within a shell of the handle and has power terminals and a drive train actuating the assembly when the motor is supplied with power. A break-before-make power supply switch at the handle selectively controls supply of power to the motor. A post-termination braking circuit electrically short-circuits the power terminals when the switch does not supply power to the motor. A method for post-termination braking of an electrical motor utilizes the permanent magnetic field of the motor to counteract an inertia-induced over-stroke characteristic 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 to the motor.
