A non-reusable retractable safety syringe is provided which has a hollow plunger and a seal member carried thereon. The provision of the plunger and the seal relative to the barrel permits the plunger, with sufficient strength, to carry applied pressure through the device during injection of a medicinal...http://www.google.fr/patents/US5910131?utm_source=gb-gplus-shareBrevet US5910131 - Non-reusable retractable safety syringe
