Manufacturing Process of Hypodermic Needle

Hypodermic needles are very useful in today’s world and as they come in direct contact with the interior portion of our body, it must be made from biocompatible materials that are safe for use and comply with government regulations. They should also be non toxic and sterilizable. To make a hypodermic needle, many substances are used. Usually the hypodermic needles are made of stainless steel or carbon steel and to prevent corrosion, they are also nickel plated. The body is made of plastic, glass or both of them. The plunger handle is made of plastic and the plunger head is made of synthetic rubber.

Hypodermic needles are made by implying different production process but the basics remain the same such as needle formation, assembly piece, labeling, packing, molding of plastic components and shipping. Steel is used to make the needle, heated at high temperature, molten and drawn through a die as per the size requirement. The steel is further made to a hollow wire and the wire is cut precisely to form the needle. Some complex types of needles are directly produced from die casting.

The syringe tube is made from number of ways as per the raw material and design. Extrusion molding is one of the methods and the raw material such as glass or plastic is supplied as granules or powder. This process involves a spiral screw that is larger in size and it is responsible for forcing materials through a heated chamber. Finally it is passed through a die which in turn produces a continuous tube. The tube is finally cooled and cut.

Injection molding is done when the tube has complex shapes like the plunger, ends or the safety caps. During this process, the plastic is heated at first and converted to a liquid. Then it is injected into an inverse mold to get the desired shape. On cooling down, it gets hardened up retaining the shape when the die is opened. The head of the plunger can also be made with this process.

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