| 摘要 |
An endoscope having an inserted portion, which is to be inserted into a tubular organ, including a bendable portion that is adapted to bend arbitrarily by a remote operation and a distal unit with a window for observation to capture an image of inside the tubular organ, is provided. A plurality of grooves are formed in parallel with an axis of the distal unit on a circumferential surface of the distal unit and the grooves are spaced from each other.
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