An assembly of devices designed to create shock waves through electromechanical action for the intracorporeal fragmentation of calculi (stones) in the urinary tract (i.e., kidney, ureter and bladder); the resulting debris may be actively removed or passed out by natural means at a later date. The energy is generated by an integral drive unit which converts electrical energy into mechanical force. The force is applied to an impact hammer that strikes the proximal end of a lithotripsy system probe which is brought into physical contact with the stone to be fragmented, therefore providing high-speed fragmentation of the calculus in situ.