A spring-actuated infusion syringe includes a housing having an open distal end, with a spring-loaded piston disposed for axial translation in the housing. The piston is biased toward the distal end of the housing. The syringe also includes a barrel for containing a liquid medicament, the barrel having...http://www.google.fr/patents/US6019747?utm_source=gb-gplus-shareBrevet US6019747 - Spring-actuated infusion syringe
