The US patent and trademark office has revealed a file by Nintendo for a controller that senses vital signs, including blood pressure. The filing 'summarises' what the device can do in a lengthy sentence. Here it is:"A wireless controller for a video game console is disclosed and includes a
main body including a measurement unit including a control circuit including a first amplification circuit, a control IC, a second amplification circuit, an ADC, a display circuit, and pins for setting, a top recess, a display, two first measurement devices adapted to contact the fingers as the hand holding the main body for measuring pulse and body temperature of a user playing a video game on the video game console, and a rotation counter for counting the number of rotations of the main body; a control unit mounted in the recess; a band including two second measurement devices for measuring blood pressure and pulse respectively by wrapping the band around the wrist; and a cable interconnecting the main body and the band."

Blood pressure, pulse and body temperature values will also be
shown on the
display whilst the 'game' is played.It sounds a lot like a complete
medical check-up kit for Wii. Our natural assumption is that this is the patent
for whatever peripheral is to be bundled with the inevitable Wii Fitter.

Source Computer and video games.