Biomechanical Study Of Cervical Traction And Development Of Traction Equipment

Cervical traction is one of the effective ways to treat and relieve cervical spondylosis,within the usual traction range,traction angle has obvious influence on the curative effect.But the research of cervical vertebra in the body mechanics test is very difficult,with the development of the computer simulation technology,The use of medical image of the three-dimensional modeling technology and finite element calculation of cervical traction for biomechanical research has received great attention.Due to the irregularity of the skeletal shape of the cervical spine and the complexity of the muscular ligament structure,it is difficult to model the complete bone-to-muscular system of the neck,a large number of finite element analysis are concentrated in the cervical vertebrae,intervertebral disc and ligament,and the number of finite element study on the effect of cervical muscle force is relatively small.In this paper,we used the medical image processing software Simpleware to obtain its overall contour range of normal cervical spine based on its CT images,establish a three-dimensional model of C1-C7 whole cervical vertebrae which included vertebrae,articular cartilage,intervertebral disc,anterior longitudinal ligament,posterior longitudinal ligament,ligamentum flavum,interspinous ligament and superior ligament by the steps of threshold analysis,regional growth,recursive Gaussian filtration,and so on,and import it into the reverse engineering software Geomagic Studio2013 to remove noise,fill holes,repair boundaries and other treatment,and with the cervical vertebrae derived from Any Body software for global registration and manual registration to complete the position match,through using the finite element analysis module in Simpleware,we established the three-dimensional finite element model of C1-C7 cervical vertebra by assigning its material properties and dividing the three-dimensional finite element mesh.To observe changes of surface EMG in Cervical traction at different weights and different angles,and associated with the changes of the cervical muscle force activity obtained in AnyBody software for comparison,so as to verify the rationality of the simulation results.The displacement and stress distribution of the cervical vertebrae were obtained by finite element analysis of the joint force and muscle force,which were simulated by AnyBody,and compared the mechanical characteristics of the cervical vertebrae,intervertebral discs and the uncovertebral joint in the presence or absence of muscle force.Through the biomechanical study of cervical traction,we obtained the degree of excitement and time of fatigue of the neck muscles in the traction process,and determined the traction angle of the early stage of traction.Finally,we designed the structure and control system of the cervical traction equipment according to the characteristics of the surface EMG signals and the biomechanical characteristics of cervical muscle traction.The traction mode is changed from the original continuous traction to continuous,intermittent traction,increased the tension sensor signal processing and display module to real-time monitor the size of traction,and feedback to the servo motor control module at any time to adjust the size of traction to better meet the clinical requirements for traction treatment in many ways,making the treatment more significant.