Patent ID: 7678063

Claim:
A motion detection system for monitoring a range of motion of a subject during a medical procedure, the combination comprising: a motion detector positioned to measure subject motion and produce an input signal; a control unit connected to receive the input signal from the motion detector and being operable in response thereto to produce displacement data indicative of subject motion from a reference position; a display having multiple indicators, each of which represents a unit of displacement from the reference position, wherein a total of the units of displacement defines an operational range of the display, and wherein the operational range of the display is less than the range of motion of the subject; a wireless communication link between the control unit and the display for conveying the displacement data from the control unit to the display such that the display indicators provide feedback to the subject; and a reference switch configured to allow manual selection of a portion of at least one of a dynamic range of the motion detector and the range of motion of the subject over which the operational range of the display operates.