Medical system and endoscope system

A medical system comprising:

• a treatment instrument comprising:
• an insertion portion comprising an exterior member configuring an exterior, the exterior member having a distal end and a proximal end and being extended in an axial direction, and an insertion member longer than the exterior member, the insertion member being advanceably and retreatably inserted into the exterior member, and
• a function portion disposed at a distal end of the insertion portion;
• an insertion portion inserting/pulling-out device comprising a pair of rollers adapted to press and nip an outer surface of the exterior member and the insertion member, the insertion portion inserting/pulling-out device transmitting a rotational driving force of the pair of rollers to the exterior member or the insertion member to advance and retreat the insertion portion;
• a rotational driving force non-transmitting portion fixed to an outer surface of a half-way portion of the insertion member extended from a proximal end surface of the exterior member, the rotational driving force non-transmitting portion being adapted to move from a position proximal of the pair of rollers to a position distal of the pair of rollers and in contact with the proximal end surface of the exterior member to transmit a driving force from the pair of rollers to the exterior member;
• and
• an advancing/retreating movement switching mechanism portion adapted to advance the insertion member along with a movement of the exterior member when the exterior member is in an advancing state, and to retreat the exterior member along with a movement of the insertion member when the insertion member is in a retreating state.

An endoscope system comprising:

• an endoscope comprising a treatment instrument channel;
• a treatment instrument configured to be inserted into the treatment instrument channel of the endoscope, wherein the treatment instrument comprises:
• an insertion portion comprising:
• an exterior member configuring an exterior, the exterior member having a distal end and a proximal end and being extended in an axial direction, and
• an insertion member longer than the exterior member, the insertion member being advanceably and retreatably inserted into the exterior member, and
• a function portion disposed at a distal end of the insertion portion;
• an insertion portion inserting/pulling-out device comprising a pair of rollers configured to press and nip an outer surface of the exterior member and the insertion member, the insertion portion inserting/pulling-out device being configured to transmit a rotational driving force of the pair of rollers to the exterior member or the insertion member to advance and retreat the insertion portion;
• a rotational driving force non-transmitting portion fixed to an outer surface of a half-way portion of the insertion member extended from a proximal end surface of the exterior member, the rotational driving force non-transmitting portion being adapted to move from a position proximal of the pair of rollers to a position distal of the pair of rollers and in contact with the proximal end surface of the exterior member to transmit a driving force from the pair of rollers to the exterior member;
• and
• an advancing/retreating movement switching mechanism portion configured to advance the insertion member along with a movement of the exterior member when the exterior member is in an advancing state, and to retreat the exterior member along with a movement of the insertion member when the insertion member is in a retreating state.