Design of a single-use injection syringe

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2021-06-01

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A disposable syringe consists of a barrel with a small opening at the tip and a matching plunger rod. It is used to inject small volumes of liquid into, or withdraw them from, areas that are inaccessible by other means. When the plunger is withdrawn, liquid or gas is drawn into the syringe through the tip’s opening; when the plunger is pushed forward, the liquid or gas is expelled. The process of using a syringe to draw in or inject gases or liquids is called injection.

A disposable syringe consists of a barrel with a small opening at the tip and a matching plunger rod. It is used to inject small volumes of liquid into, or withdraw them from, areas that are inaccessible by other means. When the plunger is withdrawn, liquid or gas is drawn into the syringe through the tip’s opening; when the plunger is pushed forward, it expels the liquid or gas. The process of drawing in or injecting gases or liquids using a syringe is called injection.

Disposable syringes can be made of either plastic or all‑glass, and they typically feature graduated markings indicating the volume of liquid contained within. Glass syringes can be sterilized in an autoclave; however, because plastic syringes are more cost‑effective to manufacture and dispose of, most modern medical syringes are now made of plastic, which further reduces the risk of bloodborne disease transmission. Among intravenous drug users, the spread of diseases—particularly HIV and hepatitis—is closely linked to the reuse of needles and syringes.

Syringes can be made of either plastic or all‑glass, and they typically feature graduated markings indicating the volume of liquid contained within. Glass syringes can be sterilized in an autoclave; however, because plastic syringes are more cost‑effective to manufacture and dispose of, most modern medical syringes are now made of plastic, which further reduces the risk of bloodborne disease transmission.

Principle of the infusion bag permeability tester: Based on the differential pressure method, the pre‑conditioned sample is placed between the upper and lower test chambers, establishing a constant pressure difference across the sample. Under this pressure differential, gas permeates from the high‑pressure chamber through the membrane into the low‑pressure chamber. By monitoring the pressure changes in the low‑pressure chamber, the barrier properties of the test sample can be determined.

When the plunger is withdrawn, liquid or gas is drawn into the syringe through the small opening at the tip; when the plunger is pushed in, the liquid or gas is expelled. The process of drawing in or injecting a gas or liquid using a disposable syringe and needle is called injection.

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