| 摘要 |
A safety syringe with a needle that is automatically and fully retracted at a preset time selected by the manufacturer, and a frangible needle-protecting cap. The syringe consists of a syringe body (16) comprising two main portions, i.e. a barrel (18) slidably receiving a plunger (17), and a retraction tube (2) for the needle holder (5), said tube being connected to the barrel via a suction channel (20) and a backflow channel (21). Prior to injection, the body of the needle holder (5) is held in place by a hydrophilic actuating device (7). During injection, the fluid to be injected contacts the operative elements of the device (7) which then expand and release the needle holder, and said needle holder, biased by a spring (4), is fully retracted into the tube (2). Said device is particularly suitable for preventing disease transmission caused by contact with infected blood.
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