Flexible Wearable Hands Help Product Design

The elderly or patients with spinal cord injury have dysfunctions such as loss of hand grip or hand muscle weakness.Such people have a long recovery treatment cycle and may even face the risk of lifelong disability.Therefore,retaining residual functions,designing wearable hand assistance products to compensate for their loss of function,assisting patients in daily hand grasping operations,and improving the quality of life seem imminent.First,based on ergonomics,research and analysis of the movement mode,size and range of the human hand skeleton.Use the analytic hierarchy process to compare the weights of factors affecting wearable hand assistance products,improve product comfort and portability under the premise of function realization.Based on the lightweight design concept,the rope drive is selected,the principle of bionics is introduced,and the muscle model of the human hand is imitated,and the tendon rope is used to replace the tendon belt to move the human hand for grasping and stretching.Through many experiments to verify the best use of materials and torque points,to ensure the comfort of daily hand grip strength.Preliminary production of the internal structure prototype,through actual wearing to verify the feasibility of flexible materials and rope drive to drive the grasp and whether the grasping trajectory and strength are reasonable.Combined with the motion trajectory of the finger joints,the joints can be expanded based on the paper-cut structure design,so that it has a better fit and extensibility,and reduces the bending resistance of the hand.The use of flexible and lightweight materials solves the problems of excessive volume,heavy load and secondary injury caused by insufficient hand joint comfort during use.Based on the emotional design theory,design the product’s shape,color and material to enhance the emotional experience of the product.Finally,the design plan is realized,the best plan is selected to construct the 3D size model of the product,and the emotional elements of the product are evaluated.In this parper,an innovative hand-assisted product is designed,which breaks the traditional rigid structure of joints,and makes expandable joints based on the paper-cut structure to make the product more suitable for hands.Lightweight materials and transmission mechanisms are selected to drive the hand grip to assist patients or elderly people in their lives.Provide new ideas for the subsequent hand-assisted design,and provide reference for related research and design practice.