Medical device and bendable unit

A medical device comprising:

• a main body driving unit including a plurality of driving sources;
• a base unit including a coupling device connected to the main body driving unit, the coupling device including a plurality of coupling units, each of the plurality of coupling units being connected to each of the plurality of driving sources;
• a bendable unit configured to be detachably attached to the base unit, the bendable unit including a bending unit and a bending driving unit configured to receive driving force of the main body driving unit via the coupling device and bend the bending unit, the bending driving unit including a plurality of linear members connected to the bending unit;
• and
• an operation unit configured to be movable between a fixed position and a detachment position in a state where the bendable unit is attached to the base unit,
• wherein a state where each of the plurality of linear members is fixed by each of the plurality of coupling units and a state where each of the plurality of linear members is unfixed from each of the plurality of coupling units are switched in an interlocked manner with movement of the operation unit,
• wherein each of the plurality of linear members is fixed to each of the plurality of coupling units so that detachment of the bendable unit from the base unit is restricted and the driving force is transmitted to the bending driving unit in a state where the bendable unit is attached to the base unit and the operation unit is located at the fixed position,
• wherein the detachment of the bendable unit from the base unit is allowed and each of the plurality of linear members is unfixed from each of the plurality of coupling units in a state where the bendable unit is attached to the base unit and the operation unit is located at the detachment position,
• wherein the plurality of linear members each includes a portion to be held, wherein the plurality of coupling units each includes a holding portion configured to hold the portion to be held, and wherein the base unit includes an interlocking unit configured to move a part of the holding portion with respect to the portion to be held in an interlocked manner with the movement of the operation unit, and
• wherein the interlocking unit includes a moving gear, wherein the plurality of coupling units each includes a gear portion configured to mesh with the moving gear and a pressing portion configured to press the holding portion.