The present invention relates to a safe intravenous cannula, which is assembled with a sleeve, a fastening member, a receiving tube, a needle head base, an elastic member and a soft needle base. The fastening member is composed of a pressing portion and a fastening sheet. The sleeve is provided for two fastening members to be correspondingly inserted and fixed. The needle head base penetrates the central partition. A multi-edge positioning portion located on the needle head base may restrain the assembly position of the needle head base, and then be fixed with the opening on the fastening sheet via a circular slot. At this time, the elastic member will be compressed and fastened within the sleeve. Next, the receiving tube is assembled at the rear end of the sleeve. Finally, the soft needle base is fastened between two pressing portions, and its position is fixed by the pressing portions. Thus, the needle head base will not be sprung into the receiving tube even when the pressing portions are pressed. When the needle head base is used, it is only required to take off the soft needle base and press the pressing portions. At this time, the opening will be overlapped, so that the needle head base will be sprung into the receiving tube by the pressure released by the elastic member. Thus, the present invention may prevent the transfusion needle on the needle head base from stabbing people.本發明係關於一種安全靜脈留置針,其主要由套筒、固持件、容置管、針頭座、彈性件及軟針座所組裝而成,其中固持件係由按壓部及固定片構成,前述套筒係供二固持件相對應插設並予以固定,而針頭座則穿設中隔部,位於針頭座上的多邊定位部可限制針頭座組裝的位置,之後再透過環形槽與固定片上的開口相固定此時彈性件則會壓縮固定於套筒內,接著將容置管組合於套筒後端,最後再將軟針座固定在二按壓部之間並由按壓部固定位置,因此儘管對按壓部施壓亦不會讓針頭座彈入容置管,當針頭座使用完畢時,僅需先取下軟針座並對按壓部施壓,此時開口會重疊藉以透過彈性件釋放壓力而讓針頭座彈入容置管,藉此可防範針頭座上的輸液針頭刺傷人之目的。10‧‧‧套筒100‧‧‧中隔部1002‧‧‧穿孔1004‧‧‧接合部102‧‧‧插設空間110‧‧‧按壓部111‧‧‧固定片1110‧‧‧開口1112‧‧‧抵觸段1114‧‧‧空間112‧‧‧彈性部113‧‧‧彈性空間114‧‧‧導斜面115‧‧‧凹槽116‧‧‧固定空間
