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Injection Molding in Medical Devices


Plastic injection molding is a large-scale craft that includes many processes, and with many advantages, it is a useful tool for creating working prototypes at scale, widely used for medical field including point-of-care diagnostics, microfluidics, and drug delivery. Based on product type, injection molding for medical devices is mainly divided into implantable parts, packaging & containers, medical device inner and outer shells, surgical consumables, etc. Plastic injection molding in the medical device market

is available for several major applications such as surgery, cardiovascular, etc.



With the development of medical products and injection molding technology, in addition to the manufacture of traditional disposable medical device products, the application of injection molding has become more extensive. New injection molding technologies, such as multi-component injection molding and inner mold components, are increasingly used for medical plastics. The continuous expansion of the application field can open up a larger demand market for plastic injection molding, thereby promoting the rapid development of the industry.



The medical device injection molding will develop in a more precise direction


Due to its unique properties, such as strong corrosion resistance, good durability, great water resistance, light weight, good flexibility, and low cost, plastics have become important materials for medical devices and products. PETG is a special plastic with high humidity, good air isolation and high transparency, so it is an ideal material for medical equipment packaging. PEEK has strong corrosion resistance, hydrolysis resistance and chemical resistance, especially when encountering human body fluids, it will be inert, so it can be used in some implantable medical devices to relieve pain of patients, such as gastrointestinal stents and implantable body fluid pump, eliminating the traditional pain of the patient caused by the puncture. Medical grade polycarbonate has the advantages of biocompatibility, strong corrosion resistance, and is not easy to break. It is the first choice for capsule endoscope shell materials. The superior properties of raw materials play an important driving role in the medical device injection molding manufacturing industry.



The smaller and thinner the medical products become, the more precision the injection molding craft requires. Meanwhile, with the greatly increased force required for injection, thousands of cycles completion and high pressure withstanding without malfunction are required for a hot runner system. Therefore, in this case, a further optimized hot runner system must be used. The way to optimize the hot runner is to use a computer-aided engineering analysis system to understand the state of the polymer melt when it flows through the manifold by analyzing melt flow, heat distribution and structure to design the optimal hot runner system. As plastic injection molding technology continues to advance, the plastic injection molding industry will evolve accordingly, as well as the medical device injection molding process.



A large number of new entrants and most small and medium-sized medical device injection molding enterprises in the industry have relatively backward infrastructure and lack advanced production and processing equipment. The key to improving the speed of industry development is the need to improve the overall level of special equipment for medical device injection molding. The output of many products has not yet matched the economic scale, which is not only difficult for the new comers to form a competitive advantage, but also difficult for them to improve profitability, which will limit the development of companies in the industry and even the entire industry.



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