It is similar to Dr Echt's leadless pacemaker, but it uses electromagnetic induction, rather than ultrasound, to stimulate a small implanted receiver, which in turn stimulates the heart.

ECONOMIST: Case history

Getting in on his fourth try, Parcells led an induction class that also included mouthy defensive lineman Warren Sapp, prolific receiver Cris Carter and a pair of stalwarts from the trenches, offensive linemen Jonathan Ogden and Larry Allen.

NPR: Parcells, Sapp, Carter Among 7 Hall Inductees