Being the filter which is used for the expiration tube of the respirator, it has with the frame and the main filter element where the influx road and the outflow road are arranged, it is arranged before the aforementioned main filter element considered as machine direction, the medicine liquid drop inside the air style which passes by the above-mentioned main filter element furthermore it has the pre-filter element which has the collection possible being transparent disposition material, the filter.< Selective figure >Figure 1人工呼吸器の呼気管に使用されるフィルタであって、流入路および流出路が配置された筐体と、主フィルタ要素とを備え、流れ方向から見て前記主フィルタ要素の前に配置され、上記主フィルタ要素を通る空気流内の薬剤液滴を収集可能な透気性材料を備える前置フィルタ要素をさらに備える、フィルタ。【選択図】図1
