| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an injection apparatus adaptable to MRI, capable of detecting the pressure of a medical solution injected to a subject without using a pressure sensor made of a magnetic material or the like. <P>SOLUTION: The driving voltage is converted to a driving signal of corresponding frequency and inputted to an ultrasonic motor 110, and a piston part of a syringe is slid by the rotation of a rotor part of the ultrasonic motor 110. At the time, the pressure of the medical solution is reflected on the load of the ultrasonic motor 110, and the load is reflected on the difference between the predetermined rotational frequency by the driving signal and the actual rotation frequency. Accordingly, the frequency or the driving voltage of the driving signal is converted to data according to the actual rotational frequency of the ultrasonic motor 110. <P>COPYRIGHT: (C)2004,JPO |
