Composite Tube Materials

Composite catheter is a medical device made by integrating different materials together. It integrates multiple advantages such as high strength, high flexibility, excellent surface properties, and biocompatibility through lamination or coating processes, greatly improving the comprehensive performance and applicability of medical catheters.

Composite tube materials include:


These are plastics that become pliable or moldable above a specific temperature and solidify upon cooling. Common thermoplastics used in catheter manufacturing include:

   – Polyethylene (PE)

   – Polyurethane (PU)

   – Polyether block amides (PEBA), often known by the trade name Pebax®

   – Polyvinyl chloride (PVC)

   – Polytetrafluoroethylene (PTFE)

   – Fluorinated ethylene propylene (FEP)

Thermoplastic Elastomers (TPEs)

These materials combine the properties of elastomers with the processing capabilities of thermoplastics and are used for softer, more flexible catheter segments.

Thermoplastic Polyurethane (TPU)

This material offers a good balance of flexibility, toughness, and biocompatibility.

High-Performance Polymers

For applications requiring high strength and temperature resistance, materials such as polyether ether ketone (PEEK) may be used.

Reinforcement Materials

To enhance certain physical properties, materials like stainless steel, nitinol (a nickel-titanium alloy), or Kevlar may be incorporated into the catheter layers in the form of braids or coils. These materials do not melt during the reflow process, but they become encapsulated by the molten thermoplastic to create a composite structure.

The specific combination of materials used in a catheter’s construction will depend on the intended application of the catheter (e.g., cardiovascular, urological, neurological, etc.) and the performance requirements for that application. The reflow process allows for the integration of these materials into a coherent. Moreover, multi-layered structure that can provide the necessary mechanical and biocompatible properties required by the medical device.

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