A disposable safety syringe, such as a dental syringe, comprising a syringe cylinder having proximal and distal ends, a pre-filled fluid medication cartridge movable through the cylinder, and a double-ended hypodermic needle cannula extending through and being bonded to a bore formed at the distal end...http://www.google.es/patents/US4826489?utm_source=gb-gplus-sharePatente US4826489 - Disposable safety syringe having means for retracting its needle cannula into its medication cartridge
Disposable safety syringe having means for retracting its needle cannula ...
