Composite layer medical tube, co-extrusion machine head and method for manufacturing medical tubes

Abstract

The invention belongs to the field of medical apparatuses and instruments, and particular relates to a composite layer medical tube. The composite layer medical tube comprises an inner layer making contact with liquid medicine and an outer layer adjacent to the inner layer, the inner layer is made of thermoplastic polyurethane elastomers or thermoplastic elastomers or ethylene-vinyl acetate copolymer or polyethylene octene copolymer, the outer layer is made of polyvinyl chloride biomedical polymer materials, a plurality of protruding structures are arranged on the outer surface of the inner layer, and the protruding structures are embedded into the outer layer. According to the composite layer medical tube, non-polyvinyl chloride biomedical polymer materials containing no DHEP are combined with low-cost PVC through the protruding structures, the migration and separation of the DEHP in an infusion process are avoided, safety of the infusion is improved, manufacturing cost is lowered, and the infusion tube is made to be more reliable and stable. The invention further provides a co-extrusion machine head for extruding the composite layer medical tube and a manufacturing method for the manufacturing the composite layer medical tubes by using the co-extrusion machine head.

Description

technical field [0001] The invention belongs to the field of medical equipment, and in particular relates to a composite layer medical pipe, a co-extrusion machine head and a method for manufacturing the medical pipe. Background technique [0002] At present, the main material used in disposable infusion sets in my country is still polyvinyl chloride (PVC) with dihexyl phthalate (DEHP) as a plasticizer. The shortcomings of this infusion set in infusion are mainly manifested in two aspects: One is that some fat emulsion drugs can dissolve the plasticizer DEHP in the PVC infusion set, which poses a threat to human health; the other is that some drugs can be absorbed by the infusion tube, reducing the curative effect. [0003] In order to ensure the safety and effectiveness of clinical infusion, it was proposed that the infusion set should be made of thermoplastic polyurethane elastomer (TPU). agent) composed of linear block polymers, and there is a polarity difference between ...

AI Technical Summary

Problems solved by technology

Its melt viscosity has a strong dependence on temperature, and a small temperature change can also cause a sharp change in its viscosity, so the processing temperature range is narrow

Furthermore, its production cost is high, the price is expensive, and the hardness adjustment is difficult

[0004] It is difficult to combine the tube layers of the existing composite infusion set, and there are gaps. Usually, there is an adhesive between the tube layers, so that the adhesive and harmful substances in the outer layer of PVC can penetrate into the inner layer

In addition, some clinical drugs need to be protected from light during infusion, otherwise they will be accompanied by photochemical degradation, photosensitivity reactions, and phototoxicity. These photochemical reactions are likely to reduce the drug’s due value and even cause side effects

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