Google recently filed an application for a patent through the World Intellectual Property Organization (WIPO) for a potential cancer-fighting device.

Wrist Wear
The device is designed to be worn on the wrist. From there, the device would target and destroy cancer cells inside the body using a process called Nanoparticle Phoresis. Targets of the wrist device could include hormones, cells, enzymes, proteins, or other molecules that when found in the blood could adversely affect the health of the wearer.

When cancer cells are detected, the wrist device will destroy them by transmitting energy into the person's blood vessels. The energy transmitted could come in the form of a time-varying magnetic field, a radio frequency pulse, an acoustic pulse, or a visible or infrared light signal. The transmitted energy is expected to cause chemical or physical changes in the cells to reduce adverse health impacts.