Active braking electrical surgical instrument and method for braking such an instrument
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United States of America Patent
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Jul 25, 2017
Issued Date -
N/A
app pub date -
Apr 16, 2013
filing date -
May 19, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
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.
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