| 摘要 |
<p>A syringe 10 for use in an autoinjector, the syringe comprising a barrel 12 having a front outlet 12a, an open rear end 12b, and a tubular body 12c extending between the front outlet and open rear end. The tubular body has an internal diameter D1 and defines a volume for containing medicament, and the open rear end has a diameter D2 substantially equal to or greater than the internal diameter of the tubular body. The syringe further comprises a polymeric elongate plunger rod 16 having a stopper 18 at a forward end and a resilient outer layer 20 along the length of the elongate plunger rod. The elongate plunger rod is disposable within the barrel such that the stopper seals against the inside of the tubular body and is slidable therein by axial translation of the plunger rod in the barrel. The resilient outer layer can be sleeve, coating or overmoulded layer that may comprise of an elastomeric material such as silicone. The resilient layer acts to strengthen the rod and can minimize the risk of the plunger rod deforming and contacting the tubular body under a high load from a driving member.</p> |
