Tapered Tubing & Bump Tubing
DUKE Extrusion manufactures custom tapered tubing and bump tubing that matches your unique requirements. Inside diameters (IDs) and outside diameters (ODs) can be varied along the length of the tube in both single and multiple lumen tubing.
Tapered tube is ideal for certain catheter applications. Neurovascular and microcatheters may have a larger proximal diameter to increase the pushability of the device while a smaller distal end provides improved performance and deliverability.
Tapered tubing is also commonly used in drug delivery catheters, such as peripherally inserted catheters (also known as PICC lines) and central venous catheters (or CVCs). Implant delivery catheters also utilize tapered tubing wherein the implant is loaded into a larger diameter distal end, while the remainder of the catheter has a smaller diameter to improve navigation in small vasculature. This lessens trauma to the patient while increasing the patient population that can be treated. Such tapered catheters are used in transcatheter aortic valve implantation and replacement procedures (TAVI and TAVR).
Taper tubing has a variable cross sectional profile over the length of the tubing. With single lumen taper tubes, the ID and OD can be varied so that: A) the wall thickness is maintained while the ID and OD change; B) the wall thickness also varies as the ID and OD change; or, C) the wall thickness varies while the ID or the OD changes.
IDs/ODs and cross sections should be specified at the large and small portions. The transition length of the taper should also be defined; taper length can vary from less than 1/2” up to 4”, depending on a number of factors, including material type.
In addition to single lumen tapered tubes, DUKE Extrusion manufactures multi-lumen taper tubing with up to four lumens, in a variety of cross-sections.
Tapered tubing may also be referred to as bump tubing. The process of producing bump tube is the same as producing taper tube. The extrusion is pulled at a variable rate while controlling the screw speed and air pressure with a closed loop feedback controller. The cutter is integrated with the puller so that the precise location of the bump or taper can be programmed. A multi-axis laser micrometer is used to continuously measure bump tubing dimensions.
Custom Tapered Tubing & Bump Tubing to Match YOUR Specifications
DUKE Extrusion can create custom bump tube and tapered tube from a broad range of materials. Tapered tubing can be combined with co-extrusion to create tubing with combined properties of two materials for specific purposes. For example, one channel of a multi-lumen taper tube can be a different color or a different polymer. Another configuration is single lumen taper or bump tubing with different materials on the inner and outer layers. This tube-on-tube, or multi-layer, co-extrusion can be tapered along the length.
We can combine these processes with multi-lumen extrusion to create tapered tubing and bump tubing with up to four individual lumens.
Tapered tubing can also be combined with braiding or coiling in the wall of the extrusion to produce reinforced tubing with variable profile.
There are material-dependent limitations to the degree of change that can be processed. DUKE Extrusion can make specific recommendations to achieve your design goals, or we can provide a quote to meet your exact specification.
Areas of application of taper tubing and bump tubing include variable stiffness catheters and catheters with multiple ports for ease of connections to luer fittings and extension lines.