Opening and closing unit and endoscope and endoscope system including the same

1. An endoscope system, comprising:

an endoscope;

an air pump configured to suck and move a contaminant generated during an endoscopic surgery; and

a reservoir configured to receive the contaminant moved by the air pump,

wherein the endoscope comprises:

an insertion unit having an insertion end portion configured to be inserted into a human body;

an operation unit coupled to the insertion unit and configured to operate the insertion end portion of the insertion unit to perform flexural movement by using an operation module;

a joint unit connected to one end of the operation unit; and

a valve disposed on the operation unit and configured to selectively communicate the insertion unit and the joint unit with each other,

wherein, starting from a distal opening of the insertion end portion, a first flow path leading to a space of the reservoir through a first tube forming a circuit outside the operation unit past a first pipe part inside the insertion unit is formed; starting from an inner space of the reservoir, a second flow path leading to an opening part of the valve through a second intermediate pipe part past a second tube and a first connecting pipe part sequentially connected thereto is formed; and starting from a second hollow part of the valve, a third flow path leading to the air pump through a third tube past a first intermediate pipe part and a second connecting pipe part connected thereto is formed.

2. The endoscope system of claim 1 , wherein the insertion unit communicates with the air pump through bypassing the operation unit.

3. The endoscope system of claim 1 , wherein the valve comprises:

a body that has a first hollow part penetrating through both end portions thereof and the opening part communicating the first hollow part with an exterior of the body; and

an opening and closing part that is inserted into the first hollow part to selectively open and close the opening part, has the second hollow part formed therein, and has a through hole communicating with the second hollow part on one side thereof.

4. The endoscope system of claim 3 , wherein the opening and closing part is disposed inside the first hollow part to enable reciprocating linear movement along a longitudinal direction.

5. The endoscope system of claim 4 , wherein the through hole selectively communicates with the opening part by the reciprocating linear movement of the opening and closing part.

6. The endoscope system of claim 5 , wherein the opening and closing part moves in a first direction to align the through hole with the opening part to allow communication therebetween, and moves in a second direction to misalign the through hole and the opening part to discontinue the communication.