A kind of attachment device of replaceable sealing phlegm suction tube of what is closed in system of the present invention,It is to be provided with an interconnecting piece on one ontology of what,It is provided with a connecting seat on what interconnecting piece,The attachment base apical margin and root edge are respectively formed opposite track groove,The one pumping phlegm pipe fitting for being connected to attachment base and being connected with interconnecting piece,What is taken out and is formed with a joint fastener combined with the track groove of attachment base on phlegm pipe fitting,And one separably be socketed what what ontology interconnecting piece replacement sealing seat,The leading flank system for replacing sealing seat is concordant with attachment base leading flank,And the track groove for the opposite connection of slot that can get on the right track with attachment base is formed with around what replacement closing seat what sealing surface,The what replacement sealing seat be concavely provided with one be arranged accommodating what interconnecting piece on be arranged slot,And thereby constitute the conveniently replaced attachment device person for taking out phlegm pipe group.本發明係關於一種可更換式密閉式抽痰管之連接裝置，其係於一本體上設置有一連接部，於連接部上設置有一連接座，該連接座頂緣與底緣分別形成相對的軌道槽，一連接至連接座且與連接部相連通的抽痰管接頭，於抽痰管接頭上形成有一與連接座之軌道槽相結合的接合片，以及一可分離地套接於於本體連接部之更換封閉座，更換封閉座的前側面係與連接座前側面平齊，並於該更換封閉座位於封閉面周圍形成有可與連接座上軌道槽相對連通的軌道槽，於該更換封閉座上凹設有一套設容置於連接部上的套設槽，而藉此構成可方便更換抽痰管組之連接裝置者。
