The sealing performance of the medical device pressure infusion bag is related to the safety of clinical infusion. Its structural design builds a strict defense line from multiple dimensions such as material properties, process technology, and component structure to ensure that the liquid is stably transported under pressure without leakage. This design must take into account durability, sealing and operational convenience, and ensure the safety and reliability of the medical process through layers of protection.
The main material of the pressure infusion bag lays the foundation for sealing. It usually uses medical-grade polymers, such as polypropylene and polyethylene. These materials have a tight molecular structure, good flexibility and tear resistance, and can withstand internal pressure without breaking. The low permeability of the material itself makes it difficult for liquid molecules to penetrate, and the surface is smooth and flat after special treatment, further reducing the risk of liquid adhesion and penetration. At the same time, the material has strong chemical resistance and can effectively resist the erosion of various drugs, avoid damage to the material structure due to chemical reactions, and thus maintain the long-term stability of the sealing performance.
The heat sealing process is the core technical means to shape the sealing structure. During the molding process of the infusion bag, the surface of the multi-layer material is partially melted and penetrated into each other by precisely controlling the high temperature, pressure and time parameters, and a firm heat-sealed edge is formed after cooling. The width and strength of the heat-sealed edge are scientifically designed to withstand internal pressure without affecting the flexibility of the infusion bag. During the production process, each heat-sealed part must undergo appearance inspection and pressure testing to ensure that there are no bubbles or cracks, to prevent the possibility of liquid leakage from the edge, and to provide a solid physical barrier for the sealing structure.
The interface design of the infusion bag plays a key role in sealing protection. The dosing port mostly uses an elastic rubber plug, which is soft and has strong resilience. After the needle punctures, the rubber plug tightly wraps the needle body to form a sealed space; after the needle is pulled out, the rubber plug quickly recovers and closes the puncture hole. The infusion interface often adopts a spiral or snap-on structure, which is tightly engaged when connected to the infusion pipeline. The internal sealing ring further enhances the sealing, ensuring that during the pressurized infusion process, the liquid cannot leak from the interface, and safe and reliable liquid transmission is achieved.
The pressure balance design is an important auxiliary to maintain the stability of the sealing structure. During the pressurized infusion process, the pressure in the bag changes continuously. If it is unevenly distributed or too high, it is easy to break the sealing limit. To this end, the infusion bag is designed with a pressure relief valve or a special bag structure. The pressure relief valve automatically opens to release pressure when the internal pressure exceeds the standard to avoid rupture of the sealing part; and the flat shape or the bag shape with reinforcement ribs can make the pressure evenly distributed, reduce the damage to the sealing structure caused by local pressure concentration, and continuously ensure the liquid sealing under dynamic pressure environment.
Strict quality inspection process builds the last line of defense for the sealing structure. Every pressure infusion bag must go through multiple inspection processes before leaving the factory. In addition to the appearance and heat-sealed edge inspection, a simulated pressurization test is also required. By filling the bag with gas or liquid, the pressure state in use is simulated to observe whether bubbles or leakage occur. Only products that pass the inspection can enter the market. At the same time, the company will regularly verify and optimize the raw materials and processes to continuously improve the reliability and safety of the sealing structure.
Clinical use specifications are crucial to maintaining sealing performance. Medical staff will carefully check the appearance of the infusion bag before use to confirm that the heat-sealed edge is not damaged and the interface connection is tight. When connecting the infusion line and adding medicine, strictly follow the regulations, keep the needle inserted vertically, and avoid oblique insertion or repeated punctures to damage the sealing of the rubber stopper. During the pressurization process, medical staff will closely observe the status of the infusion bag. Once signs of leakage are found, stop using it and replace it immediately to avoid safety hazards caused by seal failure from the operational level.
From material selection, process manufacturing to component design, to quality inspection and clinical operation, the sealing structure of the pressure infusion bag is designed through multiple links to build a comprehensive protection system. The careful control of every detail is aimed at preventing liquid leakage, ensuring the safety and stability of the pressurized infusion process, providing reliable technical support for clinical medicine, and protecting patients' medication safety and treatment effects.
