Nemoto Kyorindo Co., Ltd.

Makoto Udagawa

Toshio Kanetaka

Toshiiku Sashida

Shigeru Nemoto

Hirofumi Uchizono

Provided is an injector in which adhesion between a stator and a rotor of an ultrasonic motor can be released efficiently. An injector () which injects a chemical liquid includes: an ultrasonic motor unit () including an ultrasonic motor (); a drive mechanism () to be driven by the ultrasonic motor unit () so as to feed the chemical liquid when the ultrasonic motor () rotates forwardly; and a control device () which controls the ultrasonic motor () of the ultrasonic motor unit (). The ultrasonic motor () includes a stator () and a rotor (), and the control device () controls the ultrasonic motor () to alternately repeat forward rotation and reverse rotation so that adhesion between the stator () and the rotor () is released.

Injector and control method for an ultrasonic motor

A chemical-liquid injector includes a piston-driving mechanism () that moves a piston member of a syringe containing a contrast medium, which includes an actuator and a ram member which is moved back and forth by the actuator, a control circuit () which is electrically connected to the actuator, and an operating knob unit () which includes an operating knob that is to be operated by an operator, and a rotation sensor that outputs an electric signal corresponding to a rotation of the operating knob. The control circuit is configured to generate a predetermined control signal accordingly, on the basis of a signal from the rotation sensor, and the piston-driving mechanism is operated according to the control signal.

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Tokyo, Japan

Makoto Udagawa