The only true MRI compatible motor
The first Pneumatic Stepper Motor
Directional rotary motion of discrete displacement is achieved by
sequentially pressurizing the three ports of the motor. Pulsed pressure
waves are generated by a remote pneumatic distributor.
The motor assembly includes a motor, gearhead, and
incremental position encoder in a compact, central bore construction.
A special electronic driver is used to control the new motor with
electric stepper indexers and standard motion control cards. The
motor accepts open-loop step operation as well as closed-loop control
with position feedback from the enclosed sensor. A special control
feature is implemented to adapt classic control algorithms to the
PneuStep was designed to be compatible with magnetic
resonance medical imaging equipment, for actuating an image-guided
intervention robot (MrBot), for medical applications. The motors
were entirely made of nonmagnetic and dielectric materials, such
as plastics, ceramics, and rubbers. Encoding was performed with fiber
optics so that the motors are electricity free, exclusively using
pressure and light.
No other motor satisfies the combined MRI compatibility,
medical safety, and reliability required for precision MRI instrumentation.
The PneuStep is specifically designed for this application.
The stepper achieves easily controllable precise motion unlike other
pneumatic motors. PneuStep is readily applicable to other pneumatic
or hydraulic precision motion applications.