A pressure controller for a phlegm sucking device includes a seat body, a press element and a control valve. The seat body has a containing space, a gas inlet tube and a gas outlet tube communicated with each other. An upper end and a bottom end of the control valve abut the press element and an upper portion and a bottom of the seat body respectively for blocking or allowing communication between the gas inlet tube and the gas outlet tube. The control valve includes a plastic restoring element capable of being deformed to have a decreased height and allow the control valve for moving with the decreased height, and being recovered with a resilience. As the plastic restoring element is not deformed, the control valve blocks the communication between the gas inlet tube and the gas outlet tube. As the plastic restoring element is deformed, the control valve shifts correspondingly to make the gas inlet tube communicated with the gas outlet tube一種抽痰裝置之壓力控制器,其包括一座體、一按壓件及一控制閥。座體具有互相連通之一容置空間、一入氣管及一出氣管。控制閥配置在座體的容置空間中。控制閥之上、下端係分別頂抵按壓件與座體之上端與底部,用以阻斷或導通入氣管與出氣管之連通。控制閥包括一膠體復位件用以在按壓件被按壓時受力產生形變而高度變低致能連動控制閥並提供復位之反彈力。當膠體復位件未產生形變時,控制閥阻斷入氣管與出氣管之連通。當膠體復位件產生形變時,控制閥對應產生位移而使入氣管與出氣管連通。102‧‧‧座體104‧‧‧座筒部分105‧‧‧下外壁106‧‧‧底座部分108‧‧‧容置空間109‧‧‧座壁110‧‧‧入氣管112‧‧‧出氣管113‧‧‧下內壁114‧‧‧控制閥116‧‧‧閥桿117‧‧‧內表面118‧‧‧閥體119‧‧‧外表面120‧‧‧膠體復位件122‧‧‧閥栓124‧‧‧密封件126A、126B‧‧‧環形凸緣127‧‧‧上內壁128‧‧‧按壓件129‧‧‧上外壁
