Liquid dispenser

In combination with a syringe of the type including a hollow cylinder, a piston in said cylinder, an actuating rod connected to said piston for operating it, and a blunt needle connected to said cylinder for dispensing a liquid in said cylinder;

• a needle assembly comprising:
• (a) two spaced bead-like elements forming a stop means disposed near the free end of said needle and extending radially therefrom;
• (b) a cap, retainer strap and retainer sleeve, said retainer sleeve having an outer diameter such as to freely ride over said needle between said stop means and said cylinder, said retainer strap interconnecting said retainer sleeve and said cap, said cap having an opening to fit over said stop means and a bore extending into said opening, said bore being of such a diameter as to fit over the free end of said needle, and said cap having a closed end portion;
• (c) an extension tube having an outer diameter so as to pass through said needle;
• (d) two spaced bead-like elements forming an inner coupling element disposed near one end of said extension tube;
• and
• (e) an outer coupling element having an inner diameter to fit over said bead-like elements on said needle, said inner coupling element having a portion of reduced diameter and of a length to fit the space between said beads on said extension tube, said outer coupling element being sufficiently flexible and yieldable to receive the beads of said extension tube and said inner coupling element having an end portion with a reduced outer diameter to fit the inner diameter of said cap, whereby said extension tube may be removed from said needle and reversed in direction so that said extension tube extends beyond said needle.