Endoscopic treatment device

1. An endoscopic treatment device comprising:

an insertion unit configured to be insertable into a channel of an endoscope;

a manipulation unit provided at a proximal end portion of the insertion unit; and

a manipulation unit attachment mechanism provided at the manipulation unit, and configured to removably attach the manipulation unit to an insertion port provided at a proximal end portion of the channel of the endoscope when the insertion unit is inserted into the channel of the endoscope,

wherein the manipulation unit attachment mechanism has:

a connection slider configured to be engaged with the insertion port by sliding in a first direction intersecting an axis of the insertion unit in a state in which the manipulation unit is attached to the insertion port and be disengaged from the insertion port by sliding in a second direction intersecting the axis of the insertion unit;

an insertion-port abutment part configured to be movable relative to the connection slider in a direction of the axis of the insertion unit and move toward a proximal end of the insertion unit in the direction of the axis of the insertion unit by coming into contact with the insertion port in the state in which the manipulation unit is attached to the insertion port, wherein

when insertion port abutment part is disposed in a second position, the manipulation unit is attached to the insertion port, and

when the insertion port abutment part is disposed in a first position axially displaced in a distal direction from the second position, the manipulation unit is detached from the insertion port; and

a slider abutment part that is formed at the insertion-port abutment part and that is configured to come into contact with the connection slider to prevent sliding of the connection slider in the first direction when the insertion-port abutment part and the slider abutment part are biased to the first position, and the slider abutment part is configured to not come into contact with the connection slider to permit the sliding of the connection slider in the first direction when the insertion-port abutment part and the slider abutment part are biased to the second position;

wherein the slider abutment part and the insertion-port abutment part are biased to the first position when the manipulation unit attachment mechanism is not engaged to the insertion port of an endoscope; and

the slider abutment part and the insertion-port abutment part are biased to the second position when the manipulation unit attachment mechanism is engaged to the insertion port of the endoscope.

2. The endoscopic treatment device according to claim 1 , further comprising a biasing member configured to bias the insertion-port abutment part toward the first position.

3. The endoscopic treatment device according to claim 2 , wherein:

the connection slider has a locking hole formed to pass through the connection slider in the direction of the axis; and

the slider abutment part that has moved to the first position is inserted into the locking hole of the connection slider that has slid in the second direction, and thereby the connection slider is prevented from sliding in the first direction.

4. The endoscopic treatment device according to claim 3 , wherein:

the insertion-port abutment part is formed in a tubular shape;

a tubular groove is formed in a support face of the manipulation unit, the support face being exposed at a distal end side of the manipulation unit; and

a proximal end side of the insertion-port abutment part is inserted into the tubular groove.

5. The endoscopic treatment device according to claim 4 , wherein:

the manipulation unit includes a support tube that extends in the direction of the axis and has an outer diameter such that the support tube is insertable into the insertion port; and

the insertion unit is inserted into the support tube.

6. The endoscopic treatment device according to claim 5 , wherein the insertion unit has:

a sheath; and

a needle tube configured to be advanceably and retractably inserted into the sheath.