Surgery – Diagnostic testing – Measuring anatomical characteristic or force applied to or...
Patent
1998-04-07
2000-04-04
Apley, Richard J.
Surgery
Diagnostic testing
Measuring anatomical characteristic or force applied to or...
600595, A61B 5103
Patent
active
060455179
ABSTRACT:
This invention is a diagnostic device for measuring the extensibility of certain key carpal ligaments so as to determine the tendency of the subject to carpal tunnel damage. It consists of a structure to secure the arm and hand in a predetermined position on a stationary platform and the metacarpals of the hand in a predetermined position on a carriage moveable relative to the platform, so that the radius and ulnar bones of the forearm may be aligned in a fixed plane parallel with the moveable plane of the metacarpals of the hand. Once secure, a force is applied to the carriage in a dorsal direction perpendicular to the metacarpal plane, so as to measure the metacarpal glide. This force places stress on the ligaments of the volar joint between the proximal and distal carpal row, and resulting displacement, tension, and creep strength values are measured by a load cell and a lineometer. Using these values, the following can be determined: (1) extent of volar carpal ligament contracture and deformity; (2) requirements of ligament retraining; (3) diagnostic criteria for predicting carpal tunnel syndrome; and (4) values to assist health professionals in determining whether or not surgery for decompressing peripheral neuropathy is warranted.
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Apley Richard J.
Harvey, III James F.
Yu Justine R.
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