Ultrasonic aspirators are used to remove unwanted tissue that is adjacent or attached to vital structures in a minimally invasive fashion. By converting electrical energy into high-frequency sonic waves, ultrasonic aspirators break down soft tissues through vibration in order to preserve surrounding fibrous tissue while simultaneously irrigating and aspirating the area. Ultrasonic aspirators are designed to maximize selectivity of tissue to give the neurosurgeon greater control. Neurosurgeons can use ultrasonic aspirators to remove tumors in hard-to-reach areas by cavitation. Tissues with moderate or high fluid content are easiest to fragment, like tumors, parenchyma and fat. However, most devices on the market today have the capability to also break down tougher tissues, such as fine bones.