Bone tissue internal stress distribution numerical simulation method based on finite element under soft tissue influence in ultrasonic physical therapy
An internal stress and numerical simulation technology, applied in special data processing applications, electrical digital data processing, instruments, etc., can solve problems such as the inability to accurately measure the stress-strain distribution of bone tissue and the inability to obtain ultrasound-induced
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specific Embodiment approach 1
[0029] Embodiment 1: A numerical simulation method for internal stress distribution of bone tissue under the influence of soft tissue in ultrasonic physiotherapy based on finite elements in this embodiment is specifically prepared according to the following steps:
[0030] Step 1, establishing a finite element model of bone tissue and bone tissue-covered soft tissue;
[0031] Step 2, defining the mechanical properties of the bone tissue and the mechanical properties of the soft tissue covered by the bone tissue;
[0032] Step 3, performing coupling processing on the interface between the bone tissue and the soft tissue covered by the bone tissue;
[0033] Step 4, setting the physical therapy ultrasound parameters and the physical therapy ultrasound action mode in the numerical simulation of the stress distribution of the bone tissue and soft tissue overlying the bone tissue;
[0034] Step 5. Solve the linear elastic wave equation (the stress propagation equation in the medium...
specific Embodiment approach 2
[0039] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the specific process of establishing the finite element model of bone tissue and bone tissue-covered soft tissue in step 1 is as follows: figure 2 for:
[0040] (1) Establish the finite element model of bone tissue and soft tissue covered by bone tissue, in which the models of bone tissue and soft tissue covered by bone tissue are respectively established as hollow cylindrical structures (both bone tissue and its covered soft tissue are equivalent to hollow cylindrical structures); The shape of the propagation medium and the presence of soft tissue have a great influence on the distribution of ultrasonic energy flow, and the two must be considered; when modeling bone tissue, it needs to be as close as possible to the real bone physiological structure.
[0041] (2) Set the inner radius and outer radius of the hollow cylindrical structure of bone tissue to 4mm and 8mm respectively, and set the...
specific Embodiment approach 3
[0046] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 2, the mechanical properties of bone tissue and the mechanical properties of soft tissue covered by bone tissue are defined as:
[0047] When performing simulation calculations, it is necessary to accurately define the material properties of bone tissue and its outer soft tissue. Bone tissue is mainly composed of collagen and inorganic mineral matrix. Collagen is a polymer with a J-type stress-strain curve relationship. The stress of bone tissue will increase rapidly with the strain when the strain threshold is exceeded; soft tissue is an elastic body, and the stress-strain relationship is nonlinear macroscopically, but when the strain is <3%-5%, it can be equivalent to a linear relationship. When bone tissue and bone tissue-covered soft tissue are placed in physical therapy ultrasonic radiation, the strain range of bone tissue and bone tissue-covered soft tissue is <1% (the bone t...
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