A system and method for approaching the intervertebral disc through a percutaneous insertion from the back of a patient for thermal or electromagnetic treatment of an intervertebral disc, includes an elongated probe member having a guidable region adjacent its distal end with an undulating groove defined in its outer surface. The present invention provides new materials and their use as imaging agent. In an embodiment, the system includes a storage proxy and registry that attempts to discover storage at the e-application site or at the remote client locations. The electrical connector includes a convex portion and a concave portion for preventing the terminal spaces and the circuit board from falling apart from each other.