Coiled Tubing for Catheters & Other Medical Devices
Thin wall plastic tubing can be reinforced with metal or polymer coil to provide kink resistance and crush resistance. DUKE Extrusion’s coiled tubing is ideal for catheters and other medical devices where tubing performance is critical. Coil materials and coil design can be optimized for particular applications, depending on product requirements. The various 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
We can add coiling 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.
Kink Resistance, Crush Strength and Flexibility: Benefits of Coiled Tubing
Adding a coil and controlling the angle at which one or more filaments are positioned within the wall of the tubing improves kink resistance. Multiple filaments can be added to improve the hoop strength and crush strength of extruded thin wall plastic tubing. Variable gap coils allow for variable stiffness along the length of the tubing or may allow for holes to be located in between gaps in the coil wraps. Coil gap can be adjusted to find the perfect balance of flexibility and strength for your unique application, including creating coiled plastic tubing with variable stiffness. When the coiled filaments are stacked with a tight wind, coiled tubing offers column strength for actuator systems such as deflectable catheters, endoscopes, graspers, flexible instruments, and deployment mechanisms.
Tapered coils are also an option, and can be formed for strain reliefs and wire reinforced tubing of variable diameter.
Material Options for Coiled Plastic Tubing
DUKE Extrusion’s coil and wire reinforced tubing can be manufactured with a variety of filaments, including flat and round metal wire materials such as stainless steel and nitinol, as well as fiberglass, carbon fiber, nylon, PEEK, PET, PEN, Kevlar™, and other fiber materials. Multiple coil materials can be used in the same extrusion. For example, radiopaque wire can be paired with high strength wire to provide a combination of properties and function in the tubing.