1.福建农林大学 机电工程学院;2.中国科学院海西研究院 泉州装备制造研究中心;3.中国科学院大学
目的 提出一种鞋材杨氏模量刚度与厚度联合优化设计糖尿病足鞋垫的方法，以降低足底接触压力和软组织内部应力。方法 通过逆向工程方法建立足部有限元模型，基于足底压力分布特征划分鞋垫压力区域，采用有限元法对接触力学进行研究，为优化过程中调整不同区域内材料的杨氏模量和鞋垫前后足厚度奠定基础，使用最优拉丁超立方设计得到最优参数组合。结果 设计的鞋垫增加约37.55%的足底接触面积，跖骨区和足跟区的压力峰值分别降低15.07%、36.96%，足跟处软组织内部应力降低20.83%；足底筋膜张力降低约60%。结论 所提出的方法可用于设计定制鞋垫，设计的个性化鞋垫具有更大的接触面积和降低糖尿病足底溃疡的良好潜力。
Objective Present a method for the joint optimization design of Young's modulus and thickness of shoe for diabetic foot insoles, in order to reduce plantar pressure and internal stress in soft tissues. To propose a method for the joint optimization of stiffness and thickness in the design of diabetic foot orthotics, aiming to reduce plantar pressure and internal tissue stress. Methods A finite element model of the foot was established using reverse engineering techniques. Based on the characteristics of plantar pressure distribution, the orthotic pressure regions were identified. Finite element analysis was conducted to investigate the contact mechanics, laying the foundation for adjusting the Young's modulus and thickness of materials in different regions during the optimization process. The optimal parameter combination was obtained using the optimal Latin hypercube design. Results The designed insole increases the contact area of the sole by approximately 37.55%, resulting in a reduction of peak pressure in the metatarsal and heel regions by 15.07% and 36.96% respectively. Additionally, the internal stress in the soft tissues of the heel is reduced by 20.83%, the tension in the plantar fascia is decreased by 60% respectively. Conclusions The proposed method can be used for designing customized insoles, which have a greater contact area and hold great potential in reducing diabetic foot ulcers.