Endoscope, and treatment instrument for endoscope

1. A medical instrument system comprising:

an elongated member having a longitudinal axis and an inner space in a direction of the longitudinal axis, the elongated member formed in the direction of the longitudinal axis;

an insertion section arranged in the inner space so as to freely move in the direction of the longitudinal axis, the insertion section having a bending section capable of being bent;

a manipulation section configured to manipulate the bending section;

a first manipulation member connected to the manipulation section, the first manipulation member transmitting a driving force to the bending section in accordance with a manipulation by the manipulation section;

a second manipulation member connected to the bending section, the second manipulation member arranged in the direction of the longitudinal axis;

a connecting section having a first connecting section installed at the first manipulation member and a second connecting section installed at the second manipulation member, the connecting section capable of detachably connecting the first manipulation member and the second manipulation member; and

a switching mechanism having a first acting section configured to connect the first connecting section and the second connecting section to each other, the switching mechanism having a second acting section configured to release the first connecting section and the second connecting section from each other, the switching mechanism switching between a connection state in which the first manipulation member and the second manipulation member are connected by the connecting section and a release state in which a connection of the first manipulation member and the second manipulation member is released, wherein

the switching mechanism transitions between the release state and the connection state by relative axial movement between the elongated member and the insertion section,

in the connection state, as a proximal end of the bending section protrudes from the elongated member, the first connecting section and the second connecting section are connected to each other due to engagement between a protrusion disposed on the insertion section and the first acting section disposed on the elongated member, and the first manipulation member and the second manipulation member freely move in the direction of the longitudinal axis with respect to the direction of the longitudinal axis in accordance with the manipulation by the manipulation section, and

in the release state, as at least a portion of the bending section is disposed in the inner space of the elongated member, the connection of the first connecting section and the second connecting section is released by an action of the second acting section, and the first manipulation member freely moves in the direction of the longitudinal axis with respect to the second manipulation member and the elongated member in accordance with the manipulation by the manipulation section.

2. The medical instrument system according to claim 1 , wherein

the switching mechanism has the protrusion extending in a direction perpendicular to the longitudinal axis of the elongated member and the protrusion is configured to freely protrude from and retract into the insertion section,

the first acting section is a restricting surface formed at the elongated member,

in the connection state, as the insertion section is disposed at a position at which the proximal end of the bending section protrudes from the elongated member, the protrusion is pressed against the restricting surface and a state in which the protrusion is pushed into the inner space is maintained, and

in the release state, as at least a portion of the bending section is disposed in the inner space of the elongated member, the restricting surface and the protrusion are deviated from each other in the direction of the longitudinal axis and the protrusion protrudes from the insertion section.

3. The medical instrument system according to claim 2 , wherein

the connecting section is composed of a plunger of a solenoid,

the protrusion is connected to an electrical switch, and

when the protrusion is pushed thereinto, the plunger is actuated to connect the first manipulation member and the second manipulation member.

4. The medical instrument system according to claim 2 , further comprising:

a pulley to which the connecting section is connected;

a break member configured to form a lock state in which the pulley is not capable of moving with respect to a main body of the manipulation section; and

a lock lever configured to be manipulated so as to set and release the lock state,

wherein the lock lever is manipulated to set the lock state only when the protrusion is pushed thereinto.

5. The medical instrument system according to claim 2 , further comprising:

a pulley to which the connecting section is connected; and

a bending manipulation section detachably attached to the pulley via an electromagnetic clutch, the bending manipulation section capable of rotation-manipulating the pulley,

wherein the protrusion is connected to an electrical switch, and

when the protrusion is pushed thereinto, the electromagnetic clutch is actuated to connect the pulley and the bending manipulation section.