• Green Coiled Tubing
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Coiled Tubing for Catheters & Other Medical Devices

Thin wall catheter tubing can be reinforced with metal or polymer coil to provide kink resistance and crush resistant benefits. Coil reinforced tubing uses an internal helical coil spring and includes an elongated tubular outer wall. It is engineered to eliminate kinking or collapsing, while still maintaining flexibility. Duke Extrusion’s coiled tubing is ideal for catheters and other medical devices where tubing performance is critical. Coil reinforced tubing materials and coil design can be optimized for certain applications, depending on product requirement specifications. The numerous options that can be specified include:

  • Flat ribbon or round
  • Variable pitch
  • Wire temper
  • Multifilar coils
  • Gap distance
  • Direction of winding
  • Multiple layers of coils
  • Coil on taper

Questions about our coiled tubing capabilities? Contact us or call at 831-420-1104 today!


Coiled Tubing & Extrusions 

At Duke Extrusions we can add coil reinforced catheter tubing to extrusions in diameters from 0.010"-up to 1". Coiled plastic tubing can be added to multi-lumen extrusions in numerous configurations, with one or more lumens above or below the coil filament as needed. Each individual lumen can also be reinforced with coils with or without a PTFE or polyimide liner for added lubricity and strength.

Coiled Catheter Tubing: Kink Resistance, Crush Strength & Flexibility Benefits

Kink resistance is generally improved when a coil is added to a catheter tubing device. Coiled plastic tubing helps to control the angle at which one or more filaments are positioned within the tubing wall. Multiple filaments can also be added to thin wall extruded plastic tubing, which improves the hoop strength and crush strength of the product. Additionally, variable gap coils allow for variable stiffness along the length of the entire catheter tube. The holes may also be located in between gaps in the coil wraps. Some of the additional key benefits of coil reinforced tubing include:

  • Increased Flexibility — Coil-reinforced tubing is more flexible than braided reinforced designs
  • Increased Maneuverability — Coil-reinforced tubing is easier to route
  • Increased Kink Resistance — Resists kinking or collapsing
  • Increased Control — Improves end-user’s control over the device

Coil gap can be adjusted to find the perfect balance of flexibility and strength for your unique application, this includes our ability to create coiled plastic catheter tubing with variable stiffness aspects. Furthermore, when the coiled filaments are stacked with a tight wind, coiled tubing offers column strength for multiple actuator systems, such as:

Tapered coils are also an option, and can be formed for strain reliefs and wire reinforced tubing of various diameters.

Coiled Plastic Tubing Material Options

There are plenty of material options available for your wire and coil catheter tubing needs. Duke Extrusion’s wire and coil reinforced tubing can be manufactured with a variety of filaments, including flat and round metal wire materials, such as:

  • Stainless steel
  • Nitinol
  • Fiberglass
  • Carbon fiber
  • Nylon
  • PEEK
  • PET
  • PEN
  • Kevlar™
  • And other fiber materials

Additionally, multiple coil materials can be used in the same extrusion. For example, radiopaque wire can be paired with high strength wire to provide a co