Dayville, Connecticut -- Putnam Plastics Corp., which makes advanced extrusions for minimally invasive medical devices, has developed a process for manufacturing custom monofilament fibres up to 0.100 inches (2.54 mm) in diameter from performance materials such as polyurethane.
Putnam says that oriented, large diameter fibres offer substantial strength properties to replace metals in applications that require x-ray transparency or non-magnetic properties for MRI (magnetic resonance imaging) applications.
Putnam said that large diameter medical monofilaments between 0.64 mm and 0.100 in. 2.54 mm are generally not stock items from suppliers. Custom manufacturing these sizes requires increased extrusion volume and substantial draw down for orientation, which can "present challenges in controlling diameters, maintaining strength performance and managing setup time and costs."
Putnam claims it has overcome these challenges by developing a extrusion process for custom monofilament manufacturing that controls voids and diameters, resulting in more consistent product performance.
"The convergence of minimally invasive devices and medical imaging technologies are increasing demand for non-metallic components made from high performance materials. These emerging device solutions are custom by definition," said Ray Rilling, general manager at Putnam. He added that there is "no off-the-shelf source" for medical monofilaments with diameters greater than 0.64mm.