Modified design and application of foot lifter for children's lower limb rehabilitation robot
Objective To modified and verify the improvement effect for original spring-loaded foot lifter of lower limb reha-bilitation robot in patient with short shank unable achieve ankle dorsiflexion.Methods The lower limb rehabilitation robot foot lifter,Lokomat children's lower limb rehabilitation robot(Hocoma,Switzerland)was adopted.According to structural prin ciple of foot lifter,the spring length was optimized and improved.Two kinds of springs with spiral lengths of 2/3(43 mm)and 1/3(22 mm)of original spring(65 cm)were customized for comparative tests.From July 2022 to July 2023,14 children who met the indications of lower limb rehabilitation robot training were enrolled,which included 8 males and 6 females,aged 6-14 years old with mean age of 8.21 years old;length of lower limb was 280-400 mm with mean length of 337.14 mm;shank length ≤ 330 mm in 10 cases and＞330 mm in 4 cases.Three lengths of spring foot lifter were used for training,and the data of ankle joint angle changing with time were collected.After data analysis and statistical calculation,the maximum dorsiflexion angle of ankle joint and the maximum variation range of ankle joint were analyzed.Results The modified foot lifter solved the problem of ankle dorsiflexion in children with short shank.The maximum change in ankle plantar flexion-dorsal flexion using 22 mm spring foot lift was greater than 43 mm(P＜0.05),and the length was greater than 65 mm(P＜0.05).Conclusion It is demonstrated that the modified and optimized foot lifter of children's lower limb rehabilitation robot shows greater effect on the rehabilitation of ankle joint.
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