Co-extrusion/Multi-layer Tubes
Co-extrusion or multi-layer extrusion involves the process of layering or embedding multiple materials in a single extrusion. These complex tube constructions allow engineers to obtain the combined properties of the materials in a single tube. Co-extrusion is used in a wide range of medical tube constructions including:
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Striping. The addition of radiopaque or colored stripes is commonly used to identify extrusions under fluoroscopy or in clinical environments. The variation or application of stripes may include changes in position around a tube, multi-stripes, embedded stripes, or transition stripes. Bring your concept to us, and we will partner with you to make it a reality. Common applications include angioplasty, stenting, guide catheters, drainage, and vascular access devices.
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Tie-layering. Tie layers are typically used a primers or adhesives to bond two dissimilar materials. It is typically used in fluoropolymers and polyolefins where a highly chemical resistant material needs to be combined with elastomers.
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Transition Extrusions. This specialized co-extrusion process varies the ratio of materials relative to each other over the length of the extrusion. This is typically used where different properties at the distal versus proximal end of tube are desired. Applications include: transitions from clear material to radiopaque materials, changing durometers, changing colors, and addition of additive technologies. Transitions can vary from 0 to 100% over short or long distances.
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Multi-durometer extrusions. A special class of co-extrusion, multi-durometer extrusions change the hardness through the cross section and length of the extrusion. This construction is utilized in implantable catheters where specific lubricity, body softening, pressure, and stiffness performance is needed.
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Over Extrusion or Jacket Extrusion. The process of running an existing extrusion, mandrel, or wire through the head of the extruder to coat or jacket the tube. This can be done to add thin coatings to tubes and may involve running two extruders back to back.
We have the ability to utilize up to four materials at the same time in a given extrusions or more with dual or multiple pass extrusion. Extrusions are manufactured in our ISO 13485:2003 clean room and are typically cut to length.