What materials are the catheter mandrels made of?

Currently the mandrels commonly used in the industry for processing are: 1) stainless steel wire, rod or tube; 2) silver-plated copper wire; and 3) PTFE wire, rod or tube. The advantages and disadvantages of the three different materials are as follows:

  • Stainless steel wire, rod or tube has good dimensional retention (including outer diameter, roundness, straightness), which is conducive to the molding of the medical catheter lumen and can be continuously reused. However, its ductility is poor, and it is easy to generate local negative pressure during mandrel pulling, which may easily cause damage to the medical catheter 100% or make it impossible to remove it during removal.
  • Silver-plated copper wire has good dimensional retention (including outer diameter and roundness), which is conducive to the molding of the inner cavity of medical catheters. It also has good ductility and is very easy to remove after being thinned. However, because of its softness, the silver-plated copper wire is difficult to maintain straightness. It requires a straightening machine before use and cannot be reused after pulling thin. The overall manufacturing cost is high.
  • PTFE wire, rod or pipe has good flexibility and is not easy to damage the lubricated lining pipe during assembly. It also has good ductility and is very easy to remove after being thinned. However, its poor dimensional retention (including outer diameter, roundness, straightness), medical catheter lumen molding size is often small. And compared to metal mandrel molding, the inner surface will be more rough. It cannot be reused after drawing thin removal, and the overall manufacturing cost is high.

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