| 摘要 |
PROBLEM TO BE SOLVED: To provide a puncturing system capable of puncturing a correct position less liable to be affected by strong magnetic field of a MRI device, and to provide a pressure control valve and a pneumatic driving system used in the same. SOLUTION: This pressure control valve comprises a cylindrical pressure control valve main body, a rotary wall accommodated in a pressure control valve main body rotatably by an ultrasonic motor, and having first and second partitions for partitioning the pressure control valve main body into first and second pressure chambers, a third partition for partitioning the first pressure chamber into first and third pressure chambers, an elastic body for connecting the first partition and the third partition, an inlet port connected to the third pressure chamber to introduce a compressed fluid, an opening port connected with the second pressure chamber for discharging the compressed fluid to the external, a first flow channel connected to the pressure control valve main body, a second flow channel for communicating the first flow channel with the first pressure chamber, and a control pressure outlet port connected to the second flow channel and supplying the pressure by the compressed fluid. The first flow channel is connected to the second pressure chamber or the third pressure chamber by the rotation of the second partition. COPYRIGHT: (C)2005,JPO&NCIPI
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