| 摘要 |
<p>Plunger sub-assemblies 10 for automatic injectors 100 include a plunger outer 104 having one or more engagement prongs 104A, B, a plunger inner 110 having one or more engagement slots 110A, B which correspond with the engagement prongs 104A,B of the plunger outer 104, and a retraction biasing member 106. The retraction biasing member 106 is retained in a first energized state between the plunger outer 104 and plunger inner 110 when the engagement prongs 104A, B of the plunger outer 104 are releasably engaged with the engagement slots 110A, B of the plunger inner 110. The one or more engagement prongs 104A, B are capable of flexing substantially radially to release from engagement with the engagement slots 110A, B of the plunger inner 110 to permit the retraction biasing member 106 to expand from the first energized state to a second expanded state. An automatic injector 100 having a plunger sub-assembly 10 includes a housing 11, an activation mechanism 30, and a plunger sub-assembly 10 at least partially mounted within a syringe cartridge 20 having a needle assembly 40.</p> |
