| 摘要 |
There is provided an endoscope that prevents occurrence of buckling of a flexible body built in an insertion part of the endoscope without damaging other built-in components, and is easy to manufacture without impairing the curving manipulability. The endoscope includes a curvable portion, and an elongated insertion part being inserted into a subject. The endoscope has an elongated flexible body built in the insertion part, and a flexible protective tube that covers an outer periphery of the flexible body. The protective tube has a first region that covers the range of the flexible body, and a second region that covers the range of the soft portion. The elastic constant of the first region is smaller than the elastic constant of the second region, and the external diameter of the protective tube in the first region is larger than the external diameter of the protective tube of the second region. |
| 主权项 |
1. An endoscope comprising:
an insertion part including a distal end portion, a curvable portion connected to the distal end portion, and a soft portion connected to the curvable portion, and a body manipulating part connected to the soft portion, wherein the soft portion has a flexibility and the curvable portion is curvable by manipulating the body manipulating part, the endoscope further comprising, a first light guide unit arranged inside the curvable portion and the soft portion, and fixed to the distal end portion, a second light guide unit arranged inside the curvable portion and the sofa portion, and fixed to the distal end portion, wherein the first light guide unit has a first region extended from inside of the curvable portion to the inside of the soft portion, and a second region located at the body manipulating part side with respect to the first region and inside the soft portion, the second light guide unit has a third region extended from inside of the curvable portion to the inside of the soft portion, and a fourth region located at the body manipulating part side with respect to the third region and inside the soft portion, an proximal end portion of the third region inside the soft portion is located at a different position along an axial direction of the insertion part with respect to an proximal end portion of the first region inside the soft portion, an external diameter of the first region is larger than an external diameter of the second region, an external diameter of the first light guide unit decreases in a stepwise manner from the first region to the second region, an external diameter of the third region is larger than an external diameter of the fourth region, and an external diameter of the second light guide unit decreases in a stepwise manner from the third region to the fourth region. |
