The Development Of Assistive Device Product For Active Lower Limb Rehabilitation Training

The lower limb paralysis induced by stroke and hemiplegia is a common disease for limb dysfunction.Rehabilitative and assistive devices as an important supplement to rehabilitation training program demonstrates its great significance in improving the motor performance of the patients.But on the market,the assistive devices are mostly passive,specifically designed for patients with soft paralysis and spasticity,there is almost no device that can meet the requirements and provide useful help for those who are in need of active movement rehabilitation when they enter into the relative recovery period.Based on this issue,this research is conducted.Firstly,a literature review and analysis on domestic and overseas studies about theories and technologies concerning with rehabilitative and assistive devices are made,which finds that most of the existing products are inactive and uncomfortable to wear and use,leading to a lower participation among patients.For this reason,after a deep understanding the disease mechanism,it is necessary to decide the active space constraints of the devices for the recovering patients according to the theory of anthropometry and the static and dynamic analysis result for wearing and using process.By analyzing the clinical data about the feature of the patient’s lower limb movements,this research empowers the patient’s walking by use of human-machine interaction and a perfect match of the relationships between plantar pressure,knee angle as well as gait cycle,with a selection of the change in plantar pressure as the triggering condition for assistive compensation,and the control principle of the influence of walking gait of healthy legs to unhealthy ones for dynamic assistance compensation.By comparing the data of the main joints and plantar pressure in the patient’s two-leg walking gait,the logic of the trigger conditions and the control principle are verified to be true.According to the active space constraints and the control principle,the overall design plan of the assistive devices is determined.Considering the patient’s actual use and their psychological needs to this product,the details including structure modules,main control modules,fixing approaches,colors,materials and techniques are further described.Finally,after a careful selection of the main components for the interactive system,a product sample is developed.A comparison test is then carried out between patients and heathy people in terms of their walking gait with and without the assistive device.As the data shows,with this device,the patient’s leg improves a lot in its movement,basically the same as a healthy leg,and close to a healthy person.It proves to be functional and effective in assisting the recovery training.Based on the comparision and analysis of walking gait,the assistive device developed in this research has achieved its goal to help patients with hemiplegia conduct active rehabilitation training during relative recovery period,and obtained a pretty satisfactory result.It is a beneficial attempt to develop such products for hemiplegia patients,and provides an important selection for hemiplegia rehabilitation training.