A kind of oxygen concentration connector of what is closed in this creation system, this oxygen concentration connector includes a ducted body and an outer tube, and ducted body is equipped at least one first transmission groove, is extended with a trip and both ends with a first interface and a second interface； Outer tube can the group formula of unloading be arranged what ducted body, outer tube is equipped at least one second transmission groove and the plural tooth socket equipped with arranged in parallel, and trip can select the engaging positioning of one of them tooth socket, and the second transmission groove is enabled to expose whole or the part of the first transmission groove. Thereby, outer tube can make rotation angle offset slightly through several tooth sockets, and trip can allow the second transmission groove selectively to expose whole or the part of the first transmission groove with tooth socket automatic aligning, and then the openings of sizes of the first transmission groove is adjusted, to reach the ease of use for improving oxygen concentration connector.本創作係關於一種氧氣濃度接頭，此氧氣濃度接頭包括一中空體及一外套管，中空體設有至少一第一透空槽、延伸有一卡榫及兩端具有一第一接口與一第二接口；外套管可組卸式套設於中空體，外套管設有至少一第二透空槽及設有並列排列的複數齒槽，卡榫能夠擇其中之一齒槽卡合定位，而令第二透空槽裸露出第一透空槽的全部或局部。藉此，外套管能透過數個齒槽作些微的旋轉角度偏移，並卡榫會與齒槽自動對位，讓第二透空槽選擇性裸露出第一透空槽的全部或局部，進而調整第一透空槽的開口大小，以達到提高氧氣濃度接頭的使用便利性。
