Spiral torsion springs give medical devices rotational force from a flat, space-saving profile, which is why they appear in drug delivery devices, dose dials, and surgical instruments. This week Inside the Device looks at the spring that turns. Most springs push or pull in a straight line. A spiral torsion spring rotates. Flat strip material, wound into a spiral, delivering torque as it winds and a controlled return as it releases. Why device engineers reach for it: 🔹 Rotational return in tight axial space. 🔹 Smooth, predictable torque through the range of motion. 🔹 Consistent performance across thousands of cycles in reusable platforms, or reliable single actuation in disposables. Where you will find one working: the dose dial on a pen injector. The cap return on an autoinjector. The controlled ratchet of a hinged surgical instrument. One question worth asking any spring supplier for a device program: are they ISO 13485:2016 certified, and can they support your design from prototype through production? WE CAN! The best spring in a device is the one you never think about. #MedicalDevice #InsideTheDevice #DrugDelivery #SpringDesign #MedTech

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