Study On The Characteristics Of Skeletal Muscle Conduction Model

Functional Electrical Stimulation(FES)is a new type of treatment to restore the motor function of skeletal muscles,which is widely used in clinical rehabilitation and treatment.FES has a good therapeutic effect on hand dysfunction caused by stroke.Currently,surface electrical stimulation is the most widely used method in functional electrical stimulation with the advantages of non-invasive,easy to operate and reusable,but it also has disadvantages such as poor selectivity and poor stimulation effect,so it is necessary for functional electrical stimulation based on surface electrodes.The main research contents of this paper are as follows:Firstly,based on anatomical principles,a surface electrode array model suitable for the human forearm and can complete the functional grip action is researched.Electrical stimulation is applied to the human forearm model and theoretical analysis is carried out.The composition of the forearm skeletal muscle,the basic theory of low-frequency electrical stimulation and the stimulation parameters that affect functional electrical stimulation are briefly described.The electric field distribution in the tissue is theoretically analyzed when electrical stimulation is applied.Secondly,the finite element simulation model of the human forearm in sim4 Life multiphysics simulation software is used to analyze the electric field distribution in the tissue under the action of electrical stimulation.The positions of the stimulation electrode and the reference electrode are selected according to the structure of the forearm and the electric field in the tissue.According to the influence of parameters such as the stimulation intensity,the electrode size of electrode array contacts,the electrode spacing and gel layer conductivity on the distribution of skeletal muscle electric field in the tissue,it is proved that the stimulation intensity is positively correlated with the intensity and current density of the electric field generated in the tissue;the current density increases with the increase of electrode size rather than linearly;the electrode spacing has a greater influence on the distribution of the electric field in the tissue;and the stimulation depth is deeper when the conductivity of the gel layer is low.Based on the simulation results,a parameter model of electrical stimulation is constructed,the relationship between the parameter changes of each parameter,the final electric field intensity and current density is shown.Finally,the parameters of the electrode array are formulated according to the simulation results,and the parameters of the electrical stimulator are designed according to the needs The experimental platform of the functional electrical stimulation system based on the surface electrode is designed as a whole,combined with the angle sensor,the change of the finger movement angle under different stimulation intensity is analyzed,and the specific skeletal muscle can be activated when the electric stimulation is applied to different electrode combinations,so that the movement threshold of the finger flexion action occurs.An experimental design is performed and good results are obtained.Provides theoretical guidance for the design of surface electrode contacts and the selection of stimulus parameters.