Patent ID: 8423138

Claim:
An implantable medical device comprising: an implantable function conductor comprising at least one elongated electrical function conductor that is configured to transmit therapeutic signals or diagnostic signals or both; an implantable controllable voltage source or controllable current source or adjustable terminating impedance that is coupled to the function conductor; an implantable control unit which is connected to the controllable voltage source or controllable current source or to the adjustable terminating impedance, and which is configured to control a voltage to be applied to the function conductor by the controllable voltage source, or to control a current to be applied to the function conductor by the controllable current source, or to adjust an impedance of the adjustable terminating impedance; an implantable interference field sensor which is connected to the control unit, and which is used to detect an alternating electromagnetic or magnetic field, and to supply an output signal, corresponding to the detected alternating electromagnetic or magnetic field, to the control unit; wherein the implantable control unit is further configured to control the controllable voltage source or controllable current source as a function of the output signal of the interference field sensor and to vary the voltage or the current which is applied to the function conductor, or adjust the adjustable terminating impedance so that the voltage induced as a result of the alternating electromagnetic or magnetic field is compensated for at a distal end of the function conductor, wherein said voltage induced is compensated with a superimposed signal on the function conductor to produce a null result, wherein said superimposed signal is generated by the controllable current source or controllable voltage source, or which results from adjustment of the adjustable terminating impedance.