In the current study, Demsey and colleagues [3] developed a laser range finder prototype that can be attached to an existing drill to measure the depth holes drilled in bone. The device consists of two laser displacement sensors mounted on the sides of a conventional surgical drill that measure displacement relative to a custom drill guide held against the bone surface in standard fashion. The protype calculated the distance and depth to the bone surface from the difference between the initial position and the breach of the second cortex. The device had acceptable accuracy (within 1 mm to 2 mm) and good precision (within 1 mm).
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