| 摘要 |
A safety syringe is disclosed. The safety syringe has a hollow barrel and a plunger. The plunger enters the barrel from one end and a retractable needle leaves the barrel from the other end. A blunt sheath is positioned over the needle. The needle has an exposed position in which the point of the needle extends beyond the sheath and a covered position in which the point of the needle is contained within the sheath. The plunger and the needle are configured to cause the needle to move from the exposed position to the covered position upon the depression of the plunger. In operation, the safety syringe may be filled like a conventional syringe by placing the needle in a vial of medication and retracting the plunger. Once the safety syringe is filled, the needle is inserted into the patient. In one embodiment, the sheath may be inserted into the patient with the needle. The medication is then injected into the patient by depressing the plunger. Depressing the plunger will, as stated, cause the needle to retract into the covered position.
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