Endoscopic passage confluent structure

Abstract

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 toward a viewing window of the endoscope, the structure comprising: (i) a passage connection member having one end opened with two upstream-passage receiving bores in which the gas-feed and liquid-feed tubes are respectively inserted and fixed, other end opened 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 space having a diameter increasing in a taper-form in a direction of from the downstream-passage receiving bore toward the upstream-passage receiving bores; and (ii) a coupler pipe having one end connected to the downstream-passage receiving bore and other end connected with a base of the confluent tube.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural explanatory view of various conduits provided in an endoscope;

FIG. 2 is a sectional view of a body control portion of the endoscope, showing by omitting part of members received;

FIG. 3 is a sectional view of a passage connection member connecting between gas-feed and liquid-feed tubes and the confluent tube;

FIG. 4 is a sectional view taken on X-X in FIG. 3;

FIG. 5 is a sectional view taken on Y-Y in FIG. 3; and

FIG. 6 is a sectional view taken on Z-Z in FIG. 3.

Claims

1. 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 toward a viewing window of the endoscope, the structure comprising: (i) a passage connection member having one end opened with two upstream-passage receiving bores in which the gas-feed and liquid-feed tubes are respectively inserted and fixed,other end opened with one downstream-passage receiving bore, andan intermediate region that communicates the upstream-passage receiving bores with downstream-passage receiving bore and comprises a passage confluent space having a diameter increasing in a taper-form in a direction of from the downstream-passage receiving bore toward the upstream-passage receiving bores; and(ii) a coupler pipe having one end connected to the downstream-passage receiving bore and other end connected with a base of the confluent tube.

2. The endoscopic flow-passage confluent structure according to claim 1, wherein the passage connection member comprises a metal.