| 摘要 |
An automatic safety syringe (100) comprises: a syringe body (1), hollow on the inside and open at the front and rear, a plunger (40) sliding inside the syringe body (1) with an injection stroke extending from a retracted syringe-filling position to a forward syringe-emptying position, the plunger (40) being provided at the rear with a shaft (50) that can be operated manually and brought out of the syringe body through the rear end (80) thereof; an injection needle (10) integral with a needle carrier (11) engageable to the fore end (2) of the syringe body (1); a hooking device (60, 61) connected to the shaft (50) of the plunger, to hook the needle carrier (11) when the shaft is at the end of the injection stroke; an automatic device causing automatic retraction of the shaft of the plunger when the injection has been completed; and locking means (57) operatively connected to the stem (50) to block forward movement thereof when it is in the retracted position after intervention of the automatic device.
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