| 摘要 |
<p>A syringe holder has a barrel ( 1 ) with a needle shroud ( 4 ) telescopic into its leading end and urged forwardly by a spring ( 5 ). The shroud is rotatable into several set positions, being located by snap action of a nib ( 18 ) into longitudinal grooves within a forward extension ( 3 ) of the barrel ( 1 ). An abutment ( 21,20 ) on the shroud is thereby aligned with a selected one of several abutments ( 12,9,14 ) within the barrel, these all being at different axial positions. One setting prevents needle exposure; the others permit different amounts of needle exposure as the barrel ( 1 ) is urged forwardly during an injection.</p> |
