Patent ID: 7833155

Claim:
An endoscopic flow-passage confluent structure that connects a gas-feed tube and a liquid-feed tube provided in an endoscope to a confluent tube communicating with an ejection nozzle arranged at a tip of an insertion portion of the endoscope and for ejecting a cleaning fluid of the endoscope, the structure comprising: (i) a passage connection member which is formed by drilling a single unit having one end opened to be drilled with two upstream-passage receiving bores in which the gas-feed and liquid-feed tubes are respectively directly inserted and fixed, an other end opened to be drilled with one downstream-passage receiving bore, and an intermediate region that communicates the upstream-passage receiving bores with downstream-passage receiving bore and comprises a passage confluent hollow space having an inner diameter increasing in a taper-form in a direction of from the downstream-passage receiving bore toward the upstream-passage receiving bores by drilling from the downstream-passage receiving bores; the passage connection member having an outer diameter and the outer diameter of the passage connection member is constant from said one end continuously through the intermediate region to the other end of the passage connection member; and (ii) a coupler pipe having one end inserted into the downstream-passage receiving bore and other end connected with a base of the confluent tube.