| 摘要 |
A safety syringe includes a sleeve movably mounted to the barrel and the barrel includes a plurality of plates each of which includes a groove defined in an outer periphery thereof. The sleeve has a first flange in an inner periphery thereof and the first flange is engaged with the grooves of the plates before injection. When the injection is completed, the sleeve can be pulled till a second flange in the inner periphery thereof the sleeve is engaged with the grooves such that the cannula is enclosed and hidden by the sleeve.
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