Medical devices are becoming increasingly complicated and a patient’s life often depends on their quality. The device assembly, even for disposable devices, requires an unprecedented standard, with each component made as closely as possible to design specification. In fact, inconsistent manufacturing could have critical consequences that not only affects the function of the device but also the patient’s health.
Medical devices assemblies and sub-assemblies can be put together by mechanical – screws – or chemical bonds – solvent welding or adhesive bonding. Solvent welding is a method of bonding polymer components with a solvent, such as cyclohexanone, to chemically soften the surface and allow them to bond together. Adhesive bonding is a joining technique that uses adhesives like acrylics and epoxies to permanently join components.
Both joining methods require precise and accurately dispensed solvent or adhesive, and at Fluid Metering we developed the CeramPump to meet this challenge. Unlike other pumps, the CeramPump’s design features a valveless reciprocating and rotating piston that is insensitive to viscosity and fully made out of ceramic, making it chemically inert and allowing it to dispense a broad range of aggressive fluids including cyclohexanone, acrylic cement, 2-part epoxy bonding agents, and more.
The CeramPump is extremely accurate (1.0%) and precise (0.5%) and is particularly well suited for the microliter range. Accuracy – how repeatable is the amount dispensed – is incredibility important the quality of the product, in fact, too little product may result in partial bonding, too much adhesive may occlude the tubing orifice, and too much solvent may affect the structural integrity of the components.