Three critical components in the head of a new cryo-therapy device are machined to extremely tight tolerances from Ketron PEEK-1000 Black. The CryoPen from H&O Equipments, Aalst, Belgium, freezes localized sections of human tissue, destroying them while keeping the tissue's fiber structure intact. The treatment uses 89°C N2O gas flowing from a tank through the 0.03-mm holes in the pen nozzle.
In addition to its excellent low-temperature resistance, the newly developed Ketron PEEK from Quadrant Engineering Plastic Products, Reading Pa. (www.quadrantepp.com.), is ideal for instrument components, where aesthetics are important. The plastic reportedly has the highest elongation and toughness of all PEEK grades. It is also said to excel in seal components, where ductility and inertness are essential. Critical parts of the pen, including the Ketron PEEK components, undergo daily sterilization by steam in an autoclave, where temperatures reach 135°C. Products machined from the polymer maintain their physical properties after repeated use, even with frequent exposure to 250°C temperatures from hot water and steam.
Other key features of Ketron PEEK-1000 Black include low-moisture absorption, good wear and abrasion resistance, and excellent chemical resistance. The material resists weak acids, alkalis, ketones, ethers, esters (acetone), hydrocarbons, chlorinated solvents, alcohols, and inorganic salt solutions.
Jean M. Hoffman