Abstract: An injection assembly, at least comprising a prefilled liquid container with an outflow opening, a piston displaceable in said liquid container with a piston rod and a piston head, an injection needle with a needle fitting which is or can be fixed in the outflow opening, and seling means, said needle fitting and the piston comprising coupling means which can be mutually coupled so as to allow the injection needle to be retracted into the liquid container after use of the assembly, the injection needle further comprising a protection cap with a passage for the needle, which cap is or can be permanently mounted on the outflow opening.

Abstract: An injection assembly, at least comprising a prefilled liquid container with an outflow opening, a piston displaceable in said liquid container with a piston rod and a piston head, an injection needle with a needle fitting which is or can be fixed in the outflow opening, and seling means, said needle fitting and the piston comprising coupling means which can be mutually coupled so as to allow the injection needle to be retracted into the liquid container after use of the assembly, the injection needle further comprising a protection cap with a passage for the needle, which cap is or can be permanently mounted on the outflow opening.

Abstract: An injection assembly comprising a liquid container with an outflow opening and a piston displaceable therein, a suction needle with a needle fitting which is adapted to be releasably fitted in the outflow opening of the liquid container, and an injection needle with a needle fitting which is adapted to be permanently fixed on the outflow opening of the liquid container, said assembly further comprising an auxiliary coupling part which is fixed in the outflow opening of the liquid container, which is connected with the needle fitting of the injection needle and which comprises second coupling means which are permanently coupled with the first coupling means of the piston in the presence of the injection needle, which coupling cannot take place in the presence of the suction needle.