| 摘要 |
A safety syringe includes a barrel and a plunger is axially and movably inserted in the barrel. The plunger has a stopper connected to a first end thereof which is inserted in the barrel and a through hole is defined through the first end of the plunger. A push rod is axially and movably inserted into the plunger and an engaging member is connected to a first end of the push rod. A second end of the push rod is received in a second end of the plunger. A needle cannula is removably engaged with a first end of the barrel and has an engaging hole defined in an end thereof. The engaging member extends through the through hole and is engaged with the engaging hole of the needle cannula after injection by pushing the push rod toward the needle cannula. The needle cannular is then pulled backward and received in the barrel by pulling the plunger.
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