Mandible firearm wound simulation method

Abstract

The invention discloses a mandible firearm wound simulation method which comprises the steps of respectively building tetrahedron-hexahedron combined three-dimensional finite element models of temporal-mandibular joint concave articular surface, mandible and dejectile; then respectively conducting material assignment and assembling on the spongy bone, cortical bone and dejectile of the mandible, thus obtaining a complete mandible firearm wound mechanical model; determining model boundary conditions and loading different penetration speeds and conducting finite element analysis, thus obtaining the stress, strain and deformation fracture situation of all the parts of the mandible when suffering from penetration of dejectiles with different speed. The method can make up the defects of the current animal model when studying mandible firearm wound, provides biomechanics basis for studying mandible firearm wound, and is used for mandible firearm wound mechanism research, mandible firearm wound lethal effect evaluation, maxillofacial region protective equipment design and evaluation, mandible firearm wound medical evaluation and virtual field reconstruction.

Description

technical field [0001] The invention relates to a computer simulation method, in particular to a method for studying the process and results of the interaction between projectiles and the mandible by means of computer simulation in the study of mandibular gunshot wounds, providing biomechanics for the study of mandibular gunshot wounds. The data belong to the field of ballistic trauma and virtual reality research. Background technique [0002] The mandible is one of the most vulnerable organs in the maxillofacial region, and has a high incidence of firearm injuries in wartime. [0003] At present, the research on mandibular firearm injury is based on the animal model of live ammunition injury, and the biomechanical mechanism of the projectile and the mandible during the injury process is inferred from the animal mandibular fractures and fractures after injury. This research method has the following deficiencies: ① Animal experiments cannot directly observe the interaction p...

AI Technical Summary

Problems solved by technology

This research method has the following deficiencies: ① Animal experiments cannot directly observe the interaction process between the projectile and the mandible; ② Animal experiments cannot obtain biomechanical data such as internal stress and strain of the mandible; Injury, cumbersome operation; ④The results of animal experiments are greatly affected by individual differences, and the repeatability is poor; ⑤In order to obtain reliable statistical data, animal experiments need to increase the sample size, which is costly and time-consuming

At present, tetrahedron and hexahedron elements are used in the modeling of medical finite element models. Tetrahedron elements can be automatically or semi-automatically divided by software, which is convenient to generate elements, good for surface approximation (geometric similarity between model and real object), and suitable for shape Complex biological model modeling is widely used in the field of medical finite element simulation. Its disadvantages are: the calculation accuracy is not high enough; Calculation errors are prone to occur when geometric nonlinear changes (large deformation, large displacement and large rotation)

The hexahedral unit has high calculation accuracy and fast calculation speed, and can better simulate the geometric nonlinear changes in the process of high-speed projectiles penetrating biological tissues. Its disadvantages are: the process of dividing the unit must be manually intervened, and the modeling is time-consuming and the workload is huge; The hexahedron unit is poor in approximation to the surface, and it is rarely used in complex biological model modeling

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