The utility model relates to an
endoscope and a one-way bending variable-
pitch snake bone, the one-way bending variable-
pitch snake bone comprises a head end snake bone joint, a plurality of middle snake bone joints and a
tail end snake bone joint which are sequentially and rotatably connected, one end of the head end snake bone joint is connected with an
endoscope camera shooting part, and the other end of the head end snake bone joint is connected with an
endoscope camera shooting part; one end of the
tail end snake joint is connected with the endoscope
insertion part; the lengths of the multiple middle snake joints are sequentially increased in the extending direction from the head end to the
tail end; the endoscope is composed of the one-way bending variable-
pitch snake bone. According to the snake bone, the lengths of the snake bone joints are sequentially increased in the extending direction from the head end to the tail end, the snake bone joints are variable in pitch and are shortened from back to front, the bone pitch is shortened, the position is softer than the position with the long pitch, stress can be bent from the position with the short pitch firstly, the sweeping area of a
human body is small, and the operation pain of a patient is reduced.