| 摘要 |
An operation button for an endoscope is provided with a cylinder and a piston reciprocally slidable inside a lumen of the cylinder. A first flow channel and a second flow channel are formed to communicate with the lumen. When the piston is located at a first position, the first and second flow channel communicate with each other, while the first flow channel and the second flow channel are disconnected when the piston is located at a second position. A sealing member is provided on an outer periphery of the piston to provide secure airtightness between the cylinder and the piston. The sealing member includes a core member mainly made of one of poly-para-xylylene and poly-para-xylylene derivatives and a coating layer allocated on an outer periphery of the core member.
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