Patent ID: 8083669

Claim:
A medical device for maintaining a state of a treatment portion of a treatment instrument, the medical device comprising: the treatment instrument including, the treatment portion which is used extended from a distal end of an endoscope insertion portion having a treatment instrument channel, an operation portion for operation of advancing/retreating an operation wire coupled to the treatment portion, and a treatment instrument insertion portion in which the operation wire is advanceably/retreatably inserted, the treatment instrument insertion portion having a predetermined flexibility and inserted into the treatment instrument channel; a detecting portion for detecting advancing/retreating moving amount of the treatment instrument insertion portion; a treatment portion operating device to which the operation portion is installed, the treatment portion operating device advancing/retreating the operation wire to operate the treatment portion; an operation instructing portion for instructing operation of the treatment portion; a case body for winding and housing the treatment instrument insertion portion; and a control device configured: to calculate a correction moving amount of the operation wire to maintain the treatment portion of the treatment instrument insertion portion in a closed state during insertion of the treatment portion into the treatment instrument channel, based on the advancing/retreating moving amount of the treatment instrument insertion portion wound and housed in the case body detected by the detecting portion, and to output a drive control signal to the treatment portion operating device so as to move the operation wire according to the calculated correction moving amount to maintain the treatment portion in a closed state.