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System for testing hand, wrist, and forearm strength
| Details |
Inventors: Fry-Welch, Donna; Pfalzer, Lucinda; Kowalski, Henry C.;
Assignee: University of Michigan (Ann Arbor, MI); GMI Engineering and Management Institute (Flint, MI)
Primary Examiner: Hindenburg; Max
Assistant Examiner:
Attorney, Agent or Firm: Rohm & Monsanto
A system for measuring the forces which are applied by a limb of a living being, particularly the hand, wrist, and forearm of a human being, employs a plurality of cable members for conducting the forces exerted in a variety of directions to a single force transducer. In addition to permitting a significant reduction in cost for the apparatus of the invention, the use of a single transducer ensures that all forces are correlated in magnitude with respect to one another, thereby greatly reducing the problems associated with system calibration. The apparatus aspect of the invention permits readings of plural motions and forces to be taken, which readings can be delivered to a recording device, such as a computer for storage, analysis, and cross-correlation of the resulting data with itself and with extrinsic data. The invention therefore is useful in determining the presence of cumulative trauma disorders, such as carpal tunnel syndrome, and can assist in identifying individuals and groups of individuals, illustratively on the basis of job function, which are at high risk of developing this condition. |
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DETAILED DESCRIPTION FIG.
1 is a partially schematic simplified representation of a specific illustrative embodiment of the invention.
The figure shows a dynamometer system 10 which generally is formed of four support members, designated as 11, 12, 13, and 14.
In this embodiment, support members 11-14 are arranged to form a rectangular open frame structure.
In addition, dynamometer syste 10 is provided with a cross support member 15 which is shown to be coupled to support members 12 and 14.
Cross support member 15 has installed thereon a rotary element 17 which has associated therewith two coupling portions, 18 and 19, and which is arranged to be rotatable about a pivot 20.
As will be described below with respect to FIG.
3, rotary element 17 is used to evaluate the ability of the testee to exert a torque.
In addition, as previously indicated, cross support member 15 is easily removable off of support members 12 and 14 so as to permit the dynamometer system to be used for other types of measurements.
FIG.
2 is a simplified representation of the embodiment of the invention for performing partially isometric strength tests shown in FIG.
1 and, as shown, has cross support member 15 removed therefrom.
For purposes of the evaluation shown in FIG.
2, the cross support member is not entirely removed but instead is simply released from support member 14 and is permitted to pivot out of the way.
Referring once again to FIG.
1, it is seen that the dynamometer system is provided with four cord-like elements designated as cables 21, 22, 23, and 24.
Each of cables 21-24 is associated with a respective one of support members 11-14.
In addition, each such cable is terminated at a first end which is disposed within the open frame structure of the dynamometer system with a respective one of cable terminations 26, 27, 28, and 29.
Each of cables 21-24 is installed within a cable sheath, the cable sheaths being designated in the figure as 31, 32, 33, and 34.
The four cables of the present embodiment, and their respectively associated cable sheaths are brought to a clamping block 36 which holds cable sheaths 31-34, but otherwise does not restrict the cables therewithin to move axially
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