Patent ID: 8237782

Claim:
A medical instrument including a mechanism for removing contamination on an observation window and used by being introduced into a body and fixed thereto, the medical instrument comprising: a camera body provided with a fixing section to be fixed to a body wall in the body; an image pickup section incorporated in the camera body that picks up an image of an object to be examined in the body from an observation window formed in the camera body; a contamination removing section made of an elastic member and provided by being fixed to the camera body; a transparent cover member, an outer surface of which is in contact with the contamination removing section, provided on the observation window, disposed on the observation window rotatably around an axis along a longitudinal direction of the camera body, having a cylindrical shape with the axis along the longitudinal direction of the camera body serving as a center axis, and rotated in circumferential direction by the drive section; and a drive section incorporated in the camera body that drives the cover member to make a sliding contact between the contamination removing section and the outer surface of the cover member.