Low Friction Plastic Technology for Single-Use Drug Delivery Devices
Start-up coefficient of friction and stick-slip (or “stiction”) elimination are dominant performance drivers in single-use drug delivery devices that have moving parts. RTP Company has completed a rigorous investigation that establishes and defines a new friction test to measure and compare plastic-against-plastic friction behavior that occurs at initial startup. This new test uses forces and speeds that characterize the action of injection pens, auto-injectors, stop cocks, inhalers, safety syringes and other devices. This paper describes the newly created friction test method, and its core data point known as Glide FactorSM, as well a series of tests to compare the friction behavior of select polymers and internal lubricants for use in single-use drug delivery devices. The use of internally lubricated plastics can eliminate costly secondary operations to apply a topical lubricant, reduce the total amount of silicone that reaches the patient via the device, and improve the overall quality of the device. The goal of this paper is to share a tribological database that enables device designers to screen plastic-on-plastic friction pairs to optimize safe and effective material selections.
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