![]() The needle, which is mounted onto a sensitive, low capacity load cell, is brought down through the foil at a constant rate by the system’s motorized crosshead travel. The test typically requires a motorized force testing system, with a specialized lower fixture to hold in place a stretched foil of PBC or PU over a steel ring to simulate skin. Needle penetration and extraction forces are measured in development and production to characterize point sharpness, the frictional forces experienced along the shaft of the needles, and the effectiveness of the bevelled tip geometry. Malformed and insufficiently sharp needles points can cause considerable pain on insertion, easily preventable with a well-designed and consistently produced device. To maximize patient comfort, it is essential that a clean insertion and extraction of the needles is achieved, resulting in minimum trauma to the epidermis and subcutaneous tissue. The peel strength of an adhesive-sealed syringe packaging is commonly tested to ensure the device is secure and sterile, while remaining easily accessible on demand. The following examines seven key application areas for force and torque testing of needles and syringes, considering, in turn, the purpose, benefits, and considerations of each test, and where appropriate, describing, how they are typically performed. It also helps designers to perfect the usability and fitness-for-purpose of their devices while striking an optimum balance between material usage and mechanical strength, and ensuring all new products conform to international standards. ![]() It allows manufacturers to quickly identify and amend production errors that not only harm the brand’s reputation, but also jeopardize the safety and comfort of the patient. Force and torque testing is a simple, fast and relatively inexpensive method of quantifying the critical physical attributes of these products. Assessing the mechanical properties of needles and syringes is a crucial ingredient in the successful development and production of such devices. With ever-increasing demand to drive down mass production costs, and the frequent introduction of new safety-oriented devices, it is a continuously developing market. This article examines seven typical testing applications within this field.īillions of syringes and single-use needles are produced annually, from hypodermic and surgical needles, to lancets and winged infusion sets. Force and torque testing in development and production enables the manufacturers to guarantee consistent quality and performance of their products. Needles and syringes need to perform precisely to specification or they may seriously limit the ability of a health care professional to effectively and safely treat their patient. ![]() An Examination of Needle and Syringe force testing ![]()
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