How does the insulin injection pen plastic part play a key role in the system? —— Analyzing its multiple uses ​

As an important tool for diabetic patients to control their sugar levels in daily life, the normal operation of the insulin injection pen is highly dependent on the solid support provided by plastic parts. From the outer shell to the internal precision frame, these insulin injection pen plastic parts are like the indispensable reinforced concrete in the building, which closely connects the functional components such as the medicine reservoir, the push rod, and the dosage adjustment knob to jointly build a complete and efficient system. ​
The injection pen shell bears the primary protection responsibility. Its material usually has high strength and toughness, and can withstand various external force impacts during daily carrying. Whether it is squeezed with other items in a bag or accidentally slipped from the desktop, the sturdy shell can provide buffer protection for the internal precision parts like armor, effectively reducing the risk of parts damage caused by collision. The sealing design of the shell can block dust, water stains and bacteria, prevent the internal structure from being affected by the intrusion of pollutants and affect the performance, and ensure that the injection pen is always in good working condition. ​
In terms of ergonomic design, the contour, curvature and surface texture of the shell have been repeatedly scrutinized. The curved design that fits the palm of the hand can disperse the pressure when holding, and it is not easy to feel tired after long-term use; the non-slip texture on the surface enhances the stability of holding, so that even if the patient's hands are wet or shaking, they can still hold the injection pen firmly to ensure safe operation. The internal frame adopts a modular structure design. Through precise card slots, mortise and tenon joints and other connection methods, each component is fixed in a precise position, so that they maintain a stable relative position and movement trajectory during work, avoid mechanical failures caused by component displacement, and maintain the reliability and stability of the injection pen during use. ​
The realization of the drug storage function, the plastic drug reservoir is the core element. As a protein drug, insulin is extremely sensitive to the external environment and requires strict storage conditions. The plastic drug reservoir adopts special sealing technology, combined with a multi-layer sealing structure and a high-elastic sealing ring, to form a strict protective barrier that can effectively prevent insulin leakage while isolating from external air and moisture. This not only avoids drug waste, but also prevents the oxidation and denaturation of insulin due to contact with air, thereby ensuring the stability of drug efficacy. ​
The characteristics of the plastic material itself also bring many advantages to the drug reservoir. Its light weight means that even if patients travel with multiple pre-filled insulin pens, they will not be burdened too much; its unbreakable property allows it to be safe and sound during bumpy journeys. The transparent material of the medicine reservoir has been optically optimized to minimize refraction and reflection. Patients can clearly observe the remaining dose of insulin from different angles, and with the scale mark, they can intuitively judge whether they need to replenish the medicine. The inner wall is treated with nano-coating technology to form an ultra-smooth surface, which significantly reduces the adsorption force between drug molecules and the container wall, ensuring that the insulin dose is accurately drawn and injected each time, improving the treatment effect. ​
In the key links of insulin injection - dose adjustment and injection operation, the precision design and manufacturing of plastic parts play a decisive role. The dose adjustment knob integrates a multi-stage gear transmission system, and the meshing accuracy between gears reaches the micron level. The modulus, pressure angle and other parameters of each gear have been strictly calculated and tested. When the patient rotates the knob, this precise gear structure can convert the tiny rotation angle into precise linear displacement, thereby achieving precise control of the insulin injection dose. Whether it is a child patient who only needs a slight adjustment or an adult patient who needs a larger dose, the required dose can be easily set by the knob, and the adjustment process is smooth and unobstructed, and the scale feedback is clear and clear. ​
The cooperation between the push rod and the piston is a model of precision machinery. The push rod is made of high-strength plastic material, and the surface is treated with wear resistance to ensure that it is not easy to wear and deform during frequent use. When the patient pushes the push rod, its force transmission process is optimized and can accurately transmit the force to the piston with minimal energy loss. The piston is made of a special soft plastic material, which can not only fit tightly with the inner wall of the drug reservoir to prevent drug leakage, but also has good flexibility. It slides smoothly under the action of the push rod, pushes out the insulin in the drug reservoir at a constant pressure, and injects it into the patient's body at a uniform speed through the needle. During the research and development process, these plastic parts have undergone a large number of simulated injection experiments and clinical tests, and repeatedly optimized parameters such as dimensional tolerance and surface roughness, and finally achieved high precision of dose adjustment and smooth injection operation, allowing patients to easily and accurately complete insulin injections whether they are using it for the first time or for long-term operation.