A switchable device for closed suction catheters includes a device body and a two-way switch valve. The device body is formed with a valve sleeve, a patient tubing adaptor, a side port, and a catheter adaptor. The valve sleeve is formed with a cavity therein to allow the two-way switch valve to correspondingly rotate with respect to the device body. The catheter adaptor and the patient tubing adaptor are formed on opposing ends of the valve sleeve, thereby able to establish an unobstructed path therebetween. The side port is slantingly formed and extended from the patient tubing adaptor for smooth passage of flow therebetween. A groove is formed on one end of the patient tubing adaptor as a 360-degree freely rotatable coupling element thereof.一種密閉式抽痰管的開關裝置，包含一本體及一個二通開關閥。本體具有一體成型之套管、喉管接頭、呼吸管接頭及抽痰管接頭，套管內部形成一容腔，用以使二通開關閥可轉動地與本體相連接，抽痰管接頭及該喉管接頭分別成型於套管之外側壁且與該容腔相連通，而呼吸管接頭則斜向成型於喉管接頭之外側壁且與喉管接頭相連通，喉管接頭之一端部形成一凹環槽，用以連接一可作360度旋轉之喉管連接件。
