The invention relates to a medical removal unit (1) for blood, comprising a needle carrier (2), at least one cannula (3), which has a distal and a proximal cannula segment (6, 7), and a hose-shaped sleeve (4), which has a closed sleeve end (12) and an open sleeve end (11). The sleeve (4) is fastened to a proximal needle-carrier end (10) by means of the open sleeve end (11) and surrounds the proximal cannula segment (7) in a sealing manner in such a way that an accommodating chamber (13) is formed. An air removal device (14) connects the accommodating chamber (13) to the outer environment in order that air flows out of the accommodating chamber and is formed by at least one outflow channel (15) arranged or formed in the needle carrier (2). A partial segment of the outflow channel (15) comprises a plurality of chambers (27, 28, 29) arranged one after the other and spaced apart from each other in an outflow direction and at least one connection channel (30, 31) that connects chambers (27, 28, 29) arranged immediately adjacent in the outflow direction. The connection channel has a flow cross-section that allows the air to flow through but at least largely prevents or completely stops the bodily fluid, in particular blood, from flowing through.本發明係有關一種用於血液之醫用收集單元(1),包括針載具(2)、至少一具有遠端及近端套管段(6,7)之套管(3)及具有封閉式護套端(12)及開放式護套端(11)之軟管狀護套(4)。該護套(4)透過該開放式護套端(11)固定於近端針載具端(10)上且在形成一容置腔(13)之情況下密封包圍該近端套管段(7)。排氣裝置(14)連接該容置腔(13)與外部環境以將空氣排出該容置腔並且由至少一佈置或形成於該針載具(2)內之流出通道(15)形成。該流出通道(15)之一分區段包括數個沿排出方向依次佈置且相互隔開之腔室(27,28,29)及至少一將沿排出方向直接相鄰佈置之腔室(27,28,29)連接起來的連接通道(30,31)。該連接通道具有能被空氣穿透、但至少能防止絕大部分體液特別是血液穿透或者完全阻止其穿透之通流橫截面。1‧‧‧收集單元2‧‧‧針載具3‧‧‧套管4‧‧‧護套5‧‧‧縱軸6‧‧‧遠端套管段7‧‧‧近端套管段8‧‧‧收集通道9‧‧‧遠端針載具端10‧‧‧近端針載具端11‧‧‧遠端護套端12‧‧‧近端護套端13‧‧‧容置腔14‧‧‧排氣裝置15‧‧‧流出通道16‧‧‧基座體17‧‧‧近端端區18‧‧‧容置空間19‧‧‧內表面20‧‧‧嵌件21‧‧‧外表面22‧‧‧指示腔25‧‧‧箭頭26‧‧‧箭頭27‧‧‧腔室28‧‧‧腔室29‧‧‧腔室30‧‧‧連接通道31‧‧‧連接通道32‧‧‧連接通道33‧‧‧連接通道34‧‧‧環形附件35‧‧‧端壁36‧‧‧環形通道37‧‧‧排出通道38‧‧‧操作元件
