PPSU replaces metal for molded medical coupling

The shift away from metal in medical devices is now moving into assembly components.

LinkTech Quick Couplings, a leading global supplier of quick couplings and valves based in Ventura, CA, is using Radel polyphenylsulfone (PPSU) to mold a proprietary quick coupling.

Custom designed and developed for a leading medical device manufacturer, the PPSU-based quick coupling

is said to provide a cost-effective alternative to metal that reduces weight, simplifies manufacturing, and eliminates machining.

The new quick coupling is an external component used to quickly connect/disconnect a hose that transports sterilization solution from a tank/reservoir to the sterilization unit. The injection molded single-body design is said to provide an advantage over standard metal quick couplings made from multi-piece components that require assembly with automation equipment and ultrasonic welding.

"We chose Radel PPSU as a replacement for metal because of its lightweight strength, toughness, and resistance to heat and chemicals," said Hector Cordero, design engineer for LinkTech Quick Couplings.

Solvay Specialty Polymers (Alpharetta, GA) describes Radel PPSU as a super-tough thermoplastic that can withstand over 1000 cycles of disinfection and steam sterilization without significant loss of properties. It is inherently flame retardant and is resistant to bases and other chemicals. The specialty engineering plastic is also compliant with ISO 10993-1 for limited exposure, non-implantable applications.

Mold flow analysis was required to help determine optimum gating of the sockets, measuring 4.5 inch long and 0.75 inch high (11.4 cm by 1.9 cm), and the male plugs, measuring 1 inch long and 0.5 inch high (2.5 cm by 1.3 cm).