| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a suction operation valve for an ultrasonic endoscope which can switch a suction state from a channel suction aperture to a suction state from a balloon suction aperture by only a pushing operation of an operation button, does not often develop an operational fault, or the like, since the structure is simple, does not develop a suction leak from the balloon suction aperture side when the operation to suck from the channel suction aperture is executed, and does not develop a deadlock even when a solid is sucked. <P>SOLUTION: Piston-to-piston rotation controlling means 14a and 15a are disposed to make an inner cylinder of the piston 15 and an outer cylinder of the piston 14 engage with each other so that they can relatively move in a direction of an axis but cannot relatively rotate around the axis, and cylinder-to-cylinder rotation controlling means 25 and 26 are disposed to make the outer cylinder of the piston 14 and a cylinder body 11 engage with each other so that they can relatively move in the direction of the axis but cannot relatively rotate around the axis. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
