【Medical Mold】Analysis of Luer Joint Technology

1. Application of Luer connector

The Luer connector is a standardized micro-permeable connector. It is connected by a male Luer connector and a matching female Luer connector. It is widely used in medical and laboratory instruments. It is named after the German instrument inventor Luer in the nineteenth century. name.

Luer connectors are convenient connection devices used in the medical industry that greatly simplify the management of liquid and gaseous medical fluids. The luer connector can switch 4 infusion bags without inserting or pulling out the patient's infusion needle. The connector also allows multiple compatible fluids to be administered through the same tubing, reducing trauma to the patient.

2. Difficulties in realizing Luer connector products

Because the product is mainly to achieve the smoothness and sealing of the threaded joint. The dimensional accuracy of the corresponding screw teeth is required to be high, and the sealing performance of the product after assembly is the key difficulty in the realization of the product.

3. Luer connector mold structure

The cavity number of luer connector mold mainly adopts 1*2 or 1*4 arrangement method, the glue feeding method is side feeding and submerged glue, and the ejection method is generally thimble ejection.

4. Materials used for Luer connectors

ABS: ABS plastic has good comprehensive physical and mechanical properties, good impact toughness, good stiffness, hardness, and fatigue strength; the thermal deformation temperature of ABS plastic is 85-110°C, and it has good cold resistance and good It can be used as an electrical insulation material for general requirements; secondly, the material has good chemical stability, except for concentrated oxidizing acids, it is relatively stable to other acids, alkalis, and salts.

PC: PC material has flame retardancy, wear resistance, oxidation resistance, etc. It is an amorphous plastic with high-quality heat resistance, good transparency, high impact resistance and other physical and mechanical properties, and has high light transmittance , Refractive index and easy processing and molding.

5. Precautions for Luer connector mold

Design reasonable tolerances

The size processing of matching teeth is guaranteed to be in place

When polishing, it is necessary to pay attention to the structural characteristics of the tooth shape for protection

When matching molds, pay attention to check that the step difference at the parting line of the product must be controlled within 0.02mm

 When designing, the lower limit of the size of the corresponding sealing part is set, in case the subsequent sealing is not enough, and then glue is added.

6. Matters needing attention in the injection molding process of Luer joints

Ensure that the baking of the material is in place and the moisture content is within the range

Based on the scientific mold trial method, set a reasonable molding process

Be careful not to shrink or trap air at the joints

 Regularly monitor the mold temperature and regular maintenance of the mold waterway to ensure the smoothness of the waterway.