Drug preparing syringe with exhaust function

Abstract

Provided is a drug preparing syringe with an exhaust function. The drug preparing syringe includes a syringe body, a piston rod, a needle base and needle tubing; an inner cavity for containing medicinal liquid is formed in the syringe body; the piston rod is movably mounted in the inner cavity of the syringe body; a medicinal liquid channel is formed in the needle base which is connected to the syringe body, and the medicinal liquid channel in the needle base is communicated with the inner cavity in the syringe body; one end of a needle is mounted in the medicinal liquid channel in the needlebase, and the other end of the needle is an exposed end; the drug preparing syringe further includes a ventilation sleeve pipe; an exhaust port is formed in the upper end of the ventilation sleeve pipe, an air inlet is formed in the lower end of the ventilation sleeve pipe, the ventilation sleeve pipe sleeves the needle base and is fixedly connected with the ventilation sleeve pipe, an annular cavity for airflow to pass through is formed between the inner wall of the ventilation sleeve pipe and the outer wall of the needle, and the exhaust port and the air inlet are communicated with the annular cavity separately. The drug preparing syringe has the advantage of having the exhaust function, and when drugs are pushed, it can be ensured that air pressure inside the syringe is the same as thatoutside the syringe.

Description

technical field [0001] The invention relates to medical supplies, in particular to a syringe for dispensing medicine with exhaust function. Background technique [0002] Medical staff often use large-scale syringes and dispensing needles to prepare intravenous infusion drugs in their work. Existing syringes usually do not have an exhaust function, and when liquid is injected into the powder bottle or mother liquid bottle, the pressure in the bottle will gradually increase. [0003] Excessive pressure in the bottle will produce two phenomena: 1. When the syringe is repeatedly inserted into the rubber stopper, the liquid in the bottle will splash outwards and cause leakage. 2. As the syringe injects more liquid into the bottle, the pressure increases, and the resistance to push the syringe piston rod will gradually increase, which will bring inconvenience to the medical staff in dispensing; if it is applied to an automatic dispensing machine, the change in resistance will aff...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a syringe for dispensing medicine with an exhaust function, which solves the problem that the existing syringe is prone to cause the liquid to flow outward when injecting liquid into the powder bottle or the mother solution bottle. Splashing, and problems with progressively increasing resistance to pushing the plunger rod of the syringe

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