A syringe includes a hollow barrel, a hollow plunger movable within the barrel and a needle assembly secured within and at a distal end of the barrel. The needle assembly includes a needle holder, a resilient member that biases the needle holder toward the proximal end opening of the barrel, and a retaining...http://www.google.es/patents/US20060189935?utm_source=gb-gplus-sharePatente US20060189935 - Safety medical syringe with retractable needle
Número de solicitud: 11/249,741 Número de publicación: US 2006/0189935 A1 Fecha de presentación: 14 Oct 2005 Patente emitida: US7803132 ( Fecha de emisión 28 Sep 2010)
