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<p>With the development of catheter diagnosis and treatment technology, the clinical application of <a href="https://www.hondemedical.com/medical-catheter" rel="noopener noreferrer" target="_blank">medical catheter</a> is developing day by day, and the demand is also increasing. According to incomplete statistics, there are currently more than 120 types of catheters in 6 categories in the world alone in urology, and more than 100 catheters for diagnosis and treatment of cardiovascular, cerebrovascular, tumor and other diseases.</p><p><br></p><p>Introduction of medical catheter properties and materials</p><p>There are many kinds of medical catheter materials, and there are more than dozens of organic polymer materials used in medical plastic products, and they are used in products for different purposes with their different properties.</p><p><br></p><p>Biomedical materials refer to materials with special properties and special functions that are used in medical and health care fields such as human organs, surgical repair, physiotherapy rehabilitation, diagnosis, examination and treatment of diseases, etc., without adversely affecting human tissues and blood.</p><p><br></p><p>Medical catheter plastic is a synthetic polymer material with certain biocompatibility. From the history of catheter manufacturing, almost all materials that can be used to make tubular products have been used. These materials include: silicone rubber, polyurethane and its block copolymers, polytetrafluoroethylene, polyethylene, polypropylene, polyvinyl chloride, polymethyl methacrylate, polyurethane, polyethylene terephthalate, nylon , ABS and polycarbonate etc.</p><p><br></p><p><br></p><p>Main features of precision medical catheter</p><p>The main features of precision medical catheters are: small size, complex shape, high geometric accuracy requirements, high sanitary indicators, and high biochemical stability.</p><p>The main part of the catheter is the pipe part, which requires the inner and outer surfaces of the pipe to be smooth, precise and stable in size. The diameter of the catheter is generally 0.5 mm to several millimeters, and the allowable diameter deviation is generally less than 5%.</p><p>However, ordinary plastic pipe production equipment is used to produce plastic pipes, and the diameter deviation of the products is as high as 20% to 30%, which cannot meet the production requirements of precision medical catheters.</p><p><br></p><p><br></p><p>Precision medical catheter production process</p><p>The tube part of the precision medical catheter is produced by extrusion molding, and the accessories are mainly produced by injection molding.</p><p><br></p><p>The production process of the pipe part is as follows: According to the geometry and material of the conduit, set reasonable process parameters, including raw material formula, raw material drying conditions, extrusion temperature, screw speed, cooling medium temperature and flow rate, etc.</p><p><br></p><p>The multi-layer pipe wall material is produced by a one-time co-extrusion or two-time co-extrusion composite process. The post-treatment of the pipe depends on the requirements of the produced pipe. For pipes such as central venous catheters, it is also necessary to co-extrude marking lines on the catheter or spray scales on the surface of the catheter.</p><p><br></p>
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