For people who have just sustained an injury or are recovering from surgery (or even just a series of injections) there is always the danger that someone will bang into the wounded area and inflict extreme pain. Just the fear that this may occur can cause enough tension in the surrounding body parts for muscle spasms to set in.
Today’s invention is a wraparound band which sticks to the affected limb.
It would be constucted of air filled plastic sacs (like large bubble wrap). This would provide some mechanical protection in case impact actually occurred, without introducing extra bulk.
As well as being brightly coloured and carrying a written warning to ‘look out,’ each band would be equipped with an ultra cheap infrared proximity detector, capable of reacting to objects whilst they are still a few inches away from the sore spot and triggering an alarm (perhaps including a flashing led).