A device for fracturing calcifications in heart valves including an expandable stabilizer (14) and expandable impactor arms (20) assembled on and deployed by a delivery system (10) wherein the delivery system (10) is operable to move the impactor arms (20) while in an expanded position with respect to the stabilizer (14) with sufficient energy so as to fracture a calcification located in tissue which is sandwiched between the stabilizer (14) and the impactor arms (20).
