Joint range of motion analyzer using euler angle
AssigneeWashington University
InventorsSamuel E. Logan, Paul G. Groszewski
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Abstract
A joint range of motion evaluation system includes a three-dimensional orientation device which generates Euler angle (azimuth, elevation, roll) data closely corresponding to the permitted angular ranges of motion for many joints in a patient's body. Thus, the system collects angular data corresponding to the same angular movements experienced through the joint to provide greater information with regard to its actual movement. This information is particularly useful in detecting abnormalities and disabilities of movement and in designing and monitoring patient rehabilitation. Specific positional data with respect to specific points on the patient's joint or other surrounding anatomy is not utilized.
Claims4
In an electronic device having means for measuring the range of motion of a wrist, said wrist permitting angular movement through a plurality of orthogonal planes, said orthogonal planes comprising a substantially azimuthal plane corresponding to radial-ulnar deviation, a substantially elevational plane corresponding to flexion-extension, and a substantially axial plane aligned with the forearm corresponding to supination-pronation, the improvement comprising sensor means for directly, electronically measuring the angular range of motion of said wrist through each of said orthogonal planes of movement, said sensor means having means for generating an output comprised of angular data relating to said wrist, and means for measuring angular movement through more than one of said orthogonal planes at the same time, said sensor means comprising a pair of sensors, each of said sensors being adapted for placement on opposite sides of said wrist, the device having means for detecting a change in angular orientation with respect to each of said sensors from a common source.
Dependencies are inferred from the claim text.