The invention concerns a liquid dispenser head which is designed to be mounted on a bottle containing a liquid and comprises a filtering device (26) forming an interface between the inside and the outside of the bottle. The filtering device comprises tubular filters (30) which are extended longitudinally so they can be plunged into the bottle, particularly tubular filters whose wall consists of a membrane that is selectively permeable to a liquid to be expelled from the bottle and made of hydrophilic material for this purpose. So that the expelled liquid can be replaced by air, the membrane forming the wall of said filter tube is made of hydrophobic material so as to be selectively air-permeable. The hydrophobic membrane also filters bacteria in the air.本發明涉及一種液體分配頭，其經設計來被安裝在含有液體的瓶子上且包含過濾裝置(26)，該過濾裝置在瓶子的內部與外部之間形成界面。該過濾裝置包含在縱向上延伸以便可以投入瓶中之管狀過濾器(30)，特別是壁由膜組成的管狀過濾器，該膜選擇性地允許將要從瓶子中排出的液體透過，且該膜係由用於此目的的親水性材料製成。為了使排出的液體可以被空氣置換，形成該濾管之壁的膜係由疏水性材料製成，以便選擇性地透氣。該疏水性膜亦過濾空氣中之細菌。
