A non-orthogonal design shoulder joint five-degree-of-freedom isokinetic muscle strength evaluation and rehabilitation platform

By designing a non-orthogonal five-DOF isokinetic muscle strength assessment and rehabilitation platform for the shoulder joint, the problem of the singularity of traditional single-joint single-DOF assessment is solved. It simulates shoulder girdle movement, reduces the risk of shoulder injury, and improves the accuracy and efficiency of assessment and rehabilitation.

CN117752516BActive Publication Date: 2026-06-30HARBIN INSTITUTE OF TECHNOLOGY (SHENZHEN) (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN) +1
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Patent Information

Application Number
CN202311837749.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-28
Publication Date
2026-06-30
Estimated Expiration
2043-12-28

AI Technical Summary

Technical Problem

Traditional single-joint, single-degree-of-freedom isokinetic rehabilitation and assessment methods are limited and cannot fully consider the complex movements of the shoulder joint. They neglect the movement of the scapular girdle, increasing the risk of shoulder injury for users.

Method used

A non-orthogonal five-DOF isokinetic muscle strength assessment and rehabilitation platform for the shoulder joint was designed, including four active degrees of freedom and one passive degree of freedom. The movement of the scapular girdle is simulated through the two-DOF acromioclavicular joint, sternoclavicular joint, and the three-DOF glenohumeral ball-and-socket joint. The passive degree of freedom is realized by using slewing bearings, guide rails, and sliders, while the active degree of freedom is realized by joint servo motors and reducers. A non-orthogonal coordinate system is established to reduce space occupation and center of gravity.

Benefits of technology

It enables multi-degree-of-freedom muscle strength assessment and rehabilitation training, reduces the risk of shoulder injury, improves the accuracy of assessment and rehabilitation efficiency, and adapts to the needs of different groups of people.

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Abstract

This invention discloses a non-orthogonal design five-DOF isokinetic muscle strength assessment and rehabilitation platform for the shoulder joint, relating to the technical field of isokinetic muscle strength assessment and joint rehabilitation equipment. The device includes a two-DOF acromioclavicular joint, a sternoclavicular joint, and a three-DOF glenohumeral ball-and-socket joint; it comprises four active degrees of freedom and one passive degree of freedom, forming a five-DOF system, including the two-DOF acromioclavicular joint, the sternoclavicular joint, and the three-DOF glenohumeral ball-and-socket joint. The two-DOF acromioclavicular joint and the sternoclavicular joint are connected to the three-DOF glenohumeral ball-and-socket joint via fasteners. This invention solves the problem of the limited rehabilitation and assessment paradigms of traditional single-joint, single-DOF isokinetic instruments. It enables multi-DOF muscle strength assessment and rehabilitation training of the shoulder joint in adduction, abduction, internal and external rotation, and extension and flexion without the need to replace the mechanical adapter. It fully considers the actual degrees of freedom of the shoulder joint and adopts a non-orthogonal base structure design, improving the accuracy of joint muscle strength assessment and the efficiency of rehabilitation.
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