Comfortably Numb: Device Makes Injections Less Painful

A Rice University engineering student team called 'Comfortably Numb' has created a device to ease the pain of an injection. Their device numbs the skin prior to a shot by producing a rapid chemical reaction to cool the patient's skin. The team currently has a functioning prototype that has shown to produce a measurable numbing effect in 60 seconds. The lab device is 3D-printed and consists of two sealed chambers containing the chemical ammonium nitrate and water. A simple twisting motion moves the chambers into alignment to allow the chemicals to flow through the chamber to produce a rapid endothermic reaction.