PROBLEM TO BE SOLVED: To easily adjust sensitivity when a change has occurred in the sensitivity due to increase of a use time.SOLUTION: An oxygen supply device includes: a decompression part 10 decompressing a pressure of supplied oxygen gas an opening/closing part 20 supplying the decompressed oxygen gas to a patient or stopping it and a control part 30 opening the opening/closing part according to inhalation of the patient. The opening/closing part has an opening/closing diaphragm 23, is disposed with a nozzle 21b jetting oxygen gas and is disposed with a supply path 24 on one face side of the opening/closing diaphragm, and is disposed with a hole 31a on which a control gas acts on the other face side. The control part has a control diaphragm 32, is disposed with a nozzle 31c jetting the control gas on one face side of the control diaphragm, is formed with a chamber 56 on which the inhalation of the patient acts on the another face side, and is disposed with a spring 34 and an adjustment screw 33 energizing the control diaphragm. In the adjustment screw, an end part 33b projects into a recessed part 1c formed in an end face member 1b of a casing 1, and a knob 35 is attached to the end part.COPYRIGHT: (C)2015,JPO&INPIT【課題】使用時間が増加して感度に変化が生じた場合、容易に感度を調整する。【解決手段】供給された酸素ガスの圧力を減圧する減圧部10と、減圧された酸素ガスを患者に供給し又は停止する開閉部20と、患者の吸気に応じて開閉部を開放する制御部30とを有し、開閉部は、開閉ダイヤフラム23を有し、該開閉ダイヤフラムの一方の面側に酸素ガスを噴出するノズル21bが配置されると共に供給路24が配置され、他方の面側に制御ガスが作用する孔31aが配置され、制御部は、制御ダイヤフラム32を有し、該制御ダイヤフラムの一方の面側に制御ガスが噴出するノズル31cが配置され、他方の面側に患者の吸気が作用する室56が形成されると共に該制御ダイヤフラムを付勢するバネ34と調整ねじ33が配置され、調整ねじは端部33bがケーシング1の端面部材1bに設けた凹部1cに突出しており、該端部にはつまみ35が取り付けられている。【選択図】 図2
