A surgical device for removing a foreign object from a body is described. When a write driver drives the data line, a control signal is applied to isolate the data line from the sense amplifier. In addition, the system is adjustable in the Z-axis, which allows infinite and precise drill tip positioning prior to drilling to increase accuracy and manage chip exit. The two elbows have a generally round cross section and a generally right angle shape. Centrifuging the suspension leaves a supernatant without large particles.