Design And Research Of Rehabilitation System For Hand Disability Based On Motor Imagery Therapy

Nerve injury disability in the hand is mainly caused by neurodegenerative diseases such as stroke.The main cause of such diseases is lack of oxygen to the brain due to disruption of the blood supply,which leads to brain cell necrosis.Impaired fine manipulation of the hand is one aspect of hand disability.Usually during the rehabilitation period,doctor will ask patient to undergo hand rehabilitation to restore hand function.In the early stage after a stroke,timely rehabilitation can lead to a rapid recovery of motor function.Six months after the stroke,recovery slows down and reaches a steady state.Research has demonstrated that motor imagery training has similar effects to motor training,with both leading to activation of more specific motor cortex areas and improved motor performance after training.This study combined motor imagery theory with virtual reality based on extended FBS model,and integrated active training intentions into the design of a rehabilitation system.The system to hand movement disorders combined the behavioural characteristics of patients recovering from hand disorders based on motor imagery theory,established a rehabilitation model that guides patients to take the initiative,thus promoted neural remodelling and improved their rehabilitation outcomes.The main research content of this article includes:(1)Extending the FBS product design model to a principle-demand-functionbehaviour-structure model based on the characteristics of medical rehabilitation products,the principle module was first designed to experimentally validate the principle by recording haemoglobin signals from the relevant cortex of the subject during motor execution and motor imagery using a fNIRS.Data were processed by data analysis software to analyse the results and develop a specific motor imagery protocol.The subjects’ kinesthetic and visuomotor imagery abilities were quantitatively evaluated using the KVIQ-10,psychochronometric method was combined with the individual’s corresponding brain activation characteristics to develop a motor imagery assessment system.(2)Locating target users and conducting research and in-depth interviews,use the KANO model to define user requirements,then transforming user needs into functional needs,analysing task points for rehabilitation functions,and then analysing product and user behaviour to obtain design elements for virtual training scenarios,system software and hand rehabilitation aids.(3)Using virtual reality technology,combining auditory,tactile and other sensory stimuli to enhance the vividness of motor imagery,establishing a motor environment that can trigger motor imagery through skilled movements already stored in memory and induced within a specific environment.Users can more easily generate motor imagery for the first step in the motor session,i.e.generating pre-motor preparation,and verifying through evaluation experiments that the virtual motor the effectiveness of the environment.(4)Designing rehabilitation aids to be used in conjunction with motor imagery training for patients with hand disorders.Through behavioural analysis,the user’s real needs are explored at both quantitative and qualitative levels and guide the design of the product.Besides,the combined user needs and experimental findings guided the design practice of the motor imagery-virtual reality rehabilitation system to obtain a product prototype.