A needle-syringe assembly comprises an elongated, generally cylindrical barrel which forms a hollow nozzle located at the distal end of the barrel and which opens into the interior of the barrel. A plunger is slidably mounted in the barrel and forms a longitudinal cavity. A needle holder carries a hollow...http://www.google.com.au/patents/US5643222?utm_source=gb-gplus-sharePatent US5643222 - Hypodermic needle assembly
