#$%^&*AU2006203665B220140130.pdf#####Abstract The present invention provides an introducer needle for the catheter and introducer needle assembly, comprising a notch for flashback and a 5 crimped bump. Compared with the introducer needle with the ferrule design, the introducer needle of the invention is inexpensive, and has optimal flash back flow. 1 4 X 9 10Q Q I) 4: 'I V I' ( I -- -- Q I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I