Patent ID: 8855783

Claim:
Apparatus for treating a subject, the apparatus comprising: an external device, configured for placement outside of the subject, the external device comprising: a detector, configured to detect a factor associated with a state of the subject; and a control unit, couplable to the detector, and configured to automatically generate a signal; and an implant, comprising: an antenna, configured to be placed in an artery of the subject and to receive the signal; an effector element, comprising at least one electrode, and being couplable to an arterial site of the subject; and a driver unit, coupled to the antenna, and configured to drive the electrode to stimulate an electrode implantation site of the subject, by driving a current into the electrode implantation site, at least in part responsively to the signal, wherein the control unit is configured to detect a level of impedance of the antenna, and to modulate the signal at least partially in response to the level of impedance of the antenna and the detected factor.