| 摘要 |
An endoscope includes an insertion portion, a first bending portion, a second bending portion, a bending operation wire, a first coil sheath, a switching mechanism, a guide, a first region of the guide, a second region of the guide, and a central part formed between the first region and the second region on an inner surface of the guide, protruding inside more than the first region and the second region and formed to be longer than a coil elemental wire making up the first coil sheath. |
| 主权项 |
1. An endoscope comprising:
an insertion portion that is inserted into a subject; a bendable first bending portion that is provided on a distal end side of the insertion portion; a bendable second bending portion that is provided in the insertion portion closer to a proximal end side than the first bending portion; a bending operation wire that is inserted into the insertion portion, a distal end of the bending operation wire being fixed to the first bending portion; a first coil sheath that is inserted into the second bending portion, the bending operation wire being inserted thereinto so as to be freely movable in a longitudinal direction of the insertion portion and a distal end of the first coil sheath being fixed to a distal end side of the second bending portion; a switching mechanism that switches between fixing and unfixing of a proximal end of the first coil sheath and moves the proximal end of the first coil sheath in the longitudinal direction inside the insertion portion when the proximal end of the first coil sheath is unfixed; a guide section that is fixed to an inner surface of the second bending portion, comprising a through hole that the first coil sheath penetrates in the longitudinal axial direction, and holding the first coil sheath penetrating the through hole so that the first coil sheath runs along the inner surface of the second bending portion; a first region that is formed into a curved surface on an inner surface on a distal end side of the guide section; a second region that is formed into a curved surface on an inner surface on a proximal end side of the guide section; and a central part that is formed between the first region and the second region on the inner surface of the guide section, has a shape protruding more inside in a diameter direction of the guide section than the first region and the second region and is formed to be longer than a length in the longitudinal direction of a coil elemental wire making up the first coil sheath. |
