The deaerator which deaerates the air bubble from the liquid possesses the filler inlet of the liquid, and the frame which possesses the outlet of the liquid, and the outlet of the air bubble furthermore the hydrophobic membrane which is arranged the wall of the spiral type which stipulates the passage of the flow of spiral type of the liquid and above the wall of the aforementioned spiral type with of the wall of the aforementioned spiral type and the outlet of the aforementioned air bubble and, possesses the frame. The wall of the aforementioned spiral type passes by the aforementioned filler inlet and the flow which faces inside the liquid which goes into the aforementioned frame coerces the fact that it flows to the spiral type which parallels to the passage of the flow of the aforementioned spiral type, the aforementioned air bubble directs to the aforementioned hydrophobic membrane and rises. Use of that kind of deaerator is disclosed in the external circuit in order to deaerate the air bubble from the blood, in the middle of especially hemodialysis, blood filtration, and hemodialysis filtration, the method of deaerating the air bubble from the liquid and the especially blood is disclosed.< Selective figure >Figure 1液体から気泡を脱気する脱気装置は、液体の注入口、液体の排出口、および気泡の排出口を有する筐体を具備し、筐体はさらに液体の渦巻形の流れの通路を規定する渦巻形の壁と、前記渦巻形の壁の上側で前記渦巻形の壁と前記気泡の排出口との間に配置される疎水性の膜と、を有する。前記渦巻形の壁は、前記注入口を通り前記筐体内に入った液体の内側に向かう流れを前記渦巻形の流れの通路に沿った渦巻形に流れることを強要し、前記気泡が前記疎水性の膜に向けて上昇させる。血液から気泡を脱気するための体外の回路でそのような脱気装置の用途が開示され、特に血液透析、血液ろ過、および血液透析ろ過の途中で、液体、特に血液から気泡を脱気する方法が開示される。【選択図】図1
