Miniature implantable stimulators (i.e., microstimulators) are capable of producing unidirectionally propagating action potentials (UPAPs). The methods and configurations described may, for instance, arrest action potentials traveling in one direction, arrest action potentials of small diameters nerve...http://www.google.de/patents/US20040015204?utm_source=gb-gplus-sharePatent US20040015204 - Implantable microstimulators and methods for unidirectional propagation of action potentials
