a syringe for use with a carpule and needle is provided . the syringe comprises : a holder for accepting the carpule , the holder comprising at least two linearly disposed first mating members ; a plunger for engagement with the holder ; and a shell for slidably housing the holder , the shell having a distal aperture and a proximal aperture , with a bore therebetween , the shell comprising at least one integral biased member proximate to the proximal aperture , the biased member having a second mating member proximate to a distal end , for mating with the first mating member , such that in a first position , the needle is housed within the shell and in a second position , the needle extends at least partially from the shell .