I-stopcock enengcindezi ephezulu yezokwelapha iyisisetshenziswa esisetshenziswa kuzilungiselelo zokunakekelwa kwempilo ukulawula ukuhamba koketshezi noma amagesi.Idizayinelwe ukuxhuma imigqa emithathu ehlukene noma amashubhu futhi ivumele ukuphambukisa noma inhlanganisela yalokhu kugeleza.I-stopcock ngokuvamile iqukethe umzimba omaphakathi onezimbobo ezintathu noma izimbobo, ngayinye efakwe ivalvu noma i-lever.Ngokuphendula amavalvu, abahlinzeki bezempilo bangakwazi ukulawula ukugeleza koketshezi noma amagesi ku-stopcock. Lo mshini uvame ukusetshenziswa ezimeni zezokwelapha lapho imigqa eminingi idinga ukuxhunywa noma ukulawulwa, njengalapho kuhlinzwa okuthile, ukukhishwa kwe-arterial noma i-venous catheterizations, noma egunjini labagula kakhulu.Ivumela ochwepheshe bezokunakekelwa kwempilo ukuthi balawule indlela kanye nezinga lokumnika, ukulangazelela, noma amasampula, kuye ngezidingo ezithile zesiguli.Igama elinomfutho ophezulu libonisa ukuthi i-stopcock yakhelwe ukumelana namazinga aphezulu okucindezela, iqinisekisa ukusebenza okuphephile nokuthembekile ngisho ezimweni lapho kuhileleke khona ukucindezela okukhulu.Sekukonke, i-stopcock yezokwelapha enengcindezi ephezulu iyithuluzi elibalulekile elisiza abahlinzeki bezempilo ukuthi baphathe futhi balawule ukugeleza koketshezi noma igesi ezinqubweni zezokwelapha, ukukhuthaza ukuphepha kwesiguli kanye nokulethwa kokunakekelwa okuphumelelayo.