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Classified by pressure Needle-free infusion connectors […]
Classified by pressure
Needle-free infusion connectors are divided into negative pressure infusion connectors and positive pressure infusion connectors according to whether a positive pressure is generated. Negative pressure infusion connector: The internal structure is relatively simple. Most of them are designed as split membranes. Negative pressure is formed at the moment when the infusion set or syringe is disconnected from the connector. Wait for the operation steps and methods to prevent blood back and catheter obstruction. Negative pressure infusion joints have high technical requirements for the operation of the nurse. If the operation is not performed properly, the blood in the catheter can easily cause blockage. At the same time, the use of anti-coagulant sealing liquid can reduce the plugging rate. Positive pressure infusion connector: The internal structure is relatively complicated. There are mechanical devices to control the direction of liquid flow. Positive pressure is formed at the moment when the infusion set or syringe is disconnected from the connector, so that the liquid can quickly run towards the tip of the catheter to prevent blood backflow and catheter blockage. It is reported in the literature that the positive pressure infusion connector is used at the end of an indwelling catheter for arterial blood collection, which can also extend the flushing interval.
Classification by the principle of the fluid path
According to the principle of the joint connecting the liquid path, it is divided into a mechanical valve, a split membrane, and a mechanically combined split membrane joint. Mechanical valve infusion connector: The internal structure is a mechanical valve device, which is divided into straight-through and side-through connectors. Straight-through joints have a higher flow rate than lateral-through joints, and are less prone to liquid retention and avoid microbial colonization. Due to the T-shaped opaque structure of traditional mechanical valve positive pressure joints, the inner surface cannot be observed, and the residual blood stains cannot be thoroughly flushed. It is a catheter-related bloodstream infection and a good culture medium, which increases the chance of infection. Split-diaphragm infusion connector: transparent appearance, easy to observe, simple internal structure, smooth surface, can be quickly and thoroughly disinfected; easy to flush the tube, basically no dead space and liquid residue, not easy to colonize bacteria; and small size, not easy to cause skin pressure sore. The use of a septum membrane infusion connector can significantly reduce the incidence of infusion-related infections. Split membrane non-needle infusion connector, while avoiding acupuncture, its transparent material is convenient for observing the remaining blood stains, and it helps to reduce thrombosis and reduce the incidence of CRBSI, but using a separable membrane non-needle infusion connector can not effectively reduce The occurrence of CRBSI places high demands on sealing techniques. Under the same environment, the use of a septum-free needle-free infusion connector and proper tube sealing can reduce the incidence of CRBSI. At the same time, the use of needle-free infusion connectors requires the hospital to have all the safety medical equipment, such as screw indwelling needles and screw infusion sets. Mechanically bonded membrane joints: There are no related literature reports in China.
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