A injection device includes: a hub two wings extending from the hub and functioning as flashing indicators a tube connected to a first end of the hub a needle being in fluid communication with the second end of the hub and a check valve is provided within the tube, wherein a fluid can flow from the tube to the hub through the check valve, and the fluid is prohibited from flowing from the hub to the tube by the check valve. The flashing indicators can be observed by a user to make sure that the needle has been properly inserted into a vein.注射裝置包括:轂部;二翼片,由該轂部延伸及用作閃爍指示器;管件,被連接至該轂部的第一端部;針,與該轂部之第二端部流體相通;及止回閥,被設在該管件內,其中流體能經過該止回閥由該管件流至該轂部,且該流體藉由該止回閥被禁止由該轂部流動至該管件。該閃爍指示器能被使用者所觀察,以確定該針已被適當地插入靜脈。2‧‧‧注射裝置21‧‧‧主要本體22‧‧‧針211‧‧‧轂部212‧‧‧翼片213‧‧‧室214‧‧‧管件
