A multi-layer thermoelectric module and a fabricating method thereof are provided. When employing such beams, the addition of electrons or negative ions for neutralizing the effects of space charge is often crucial for achieving success. In a preferred embodiment of the method, the microprocessor detects and captures a key component entered by a key custodian. A fixation mechanism is at the distal end of the lead body, and is adapted to collapse to a first configuration during implantation and deploy to a second configuration after implantation.