Patent ID: 8290578

Claim:
An apparatus for use with a catheter having an electrode at a distal end thereof and a handle at a proximal end thereof, and a cable for making a first electrical connection between an electrical device and a proximal end of the handle, the catheter further including a lead electrically connected to the electrode and different from the first electrical connection in the cable, the lead being configured to be coupled to the first electrical connection in the cable so as to allow the device through the first electrical connection and the lead to electrically interact with the electrode, said apparatus comprising: a circuit having a predetermined known complex impedance responsive to a pilot signal having a predetermined frequency, said circuit being disposed in one of said handle of said catheter and a distal end of said cable in a cable connector interface that is configured to be coupled to said handle, said circuit being electrically connected to said to said first electrical connection when said cable is coupled to said handle; a compensation control configured to generate said pilot signal, said cable being further configured to make a second electrical connection between the compensation control and said circuit wherein said second electrical connection is independent of said first electrical connection, said compensation control being further configured to measure a complex impedance of said second electrical connection and said circuit responsive to said pilot signal, said compensation control is further configured to produce a difference signal indicative of a difference between said measured complex impedance and said predetermined, known complex impedance.