Recent developments have led to the creation of wearable technology. Smartwatches, Google Glass and other wearable devices have been designed with a variety of uses, often connecting with users’ smartphones. The next step beyond wearing tech devices might be actually putting them into people’s bodies. And as bizarre as that idea may sound, it’s already a common part of several medical treatments. Since the late 1950s, heart doctors have been implanting electronic devices to regulate their patients’ heartbeats. These devices, called artificial pacemakers, help millions of heart patients around the world.
a variety of：各種各樣的（= all sorts of、all kinds of）