Knee brace generates electricity to power gadgets

Scientists recently demonstrated a knee brace that generates enough electricity to power a cell phone conversation for 30 minutes from one minute of walking.

The system works similar to the regenerative breaking found in some hybrid cars such as the Toyota Prius. At the end of a stride, the brace takes over the task of stopping your leg and generates power while it is doing that. The generator in the device then turns off so you don’t use any more energy taking the rest of your step.

This is a great new idea for yet another way to generate renewable electricity.  Unfortunately, we really don’t see this taking off.  Although practical, we don’t know anyone who would go outside wearing a device like this.
Photo: Greg Ehlers/Simon Fraser University