A method for constructing arch-rod structure based on the principal axis of the living bone inertia of the arch of the foot

A technology of inertia spindle and structure construction, applied in the field of biomedical engineering, can solve problems such as poor reliability, and achieve the effects of easy rotation, reduced friction, and high reliability

Active Publication Date: 2021-06-25
FUJIAN NORMAL UNIV
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  • Description
  • Claims
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for constructing the structure of the arch of the foot based on the principal axis of the living bone inertia of the arch of the foot, so as to solve the problem of poor reliability of the existing complex biological structures such as the arch of the foot by using the finite element method. question

Method used

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  • A method for constructing arch-rod structure based on the principal axis of the living bone inertia of the arch of the foot
  • A method for constructing arch-rod structure based on the principal axis of the living bone inertia of the arch of the foot
  • A method for constructing arch-rod structure based on the principal axis of the living bone inertia of the arch of the foot

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Embodiment 1

[0071] A method for constructing the structure of the arch rod system based on the principal axis of inertia, comprising the following steps:

[0072] S1: According to the tomographic images of the living arch bones, three-dimensional reconstruction is performed on the living arch bones to obtain a three-dimensional model of the living arch bones; the living arch bones include 7 tarsal bones and 5 metatarsal bones;

[0073] S2: Divide the obtained three-dimensional model of the living bone of the arch of the foot into a collection of multiple volume elements, and then obtain the centroid of each volume element of the three-dimensional model of the living arch of the foot bone according to the coordinates and density of each volume element in the image; The living bone of the arch of foot comprises 7 tarsal bones and 5 metatarsal bones;

[0074] S3: establish the first three-dimensional Cartesian coordinate system whose coordinate origin is on the centroid of the living bone in...

Embodiment 2

[0090] The calculation principle of a method for constructing the structure of the arch rod system based on the principal axis of inertia is as follows:

[0091] Solve the center of mass and the principal axis of inertia of the living bone of the arch of the foot, the principal axes of inertia are respectively around x, y, y, x, y, z, ... in this order, and the recorded angular displacements are respectively α 1 ,β 1 ,γ 1 ,α 2 ,β 2 ,λ 2 ,……;

[0092] The centroid of the arch bone is calculated by the following equation by reconstructing the arch bone based on tomographic images:

[0093]

[0094] where (x c ,y c ,z c ) is the centroid position of the arch bone, (x i the y i ,z i ) represents the position and mass of the i-th volume element of the arch bone.

[0095] It is stipulated that the arch bone rotates in the order of x→y→z.

[0096] Rotation around the x-axis;

[0097] The spatial Cartesian coordinate system of the centroid of the arch bone reconstruct...

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Abstract

The invention provides a method for constructing the arch rod structure based on the main axis of inertia of the living arch of the foot bone. Based on the center of mass of the living arch of the foot bone, the main axis of inertia of the living bone is solved according to a specific rotation sequence; Three-dimensional rectangular coordinate system; select six maximum and minimum marked points along the three coordinate axes in the established three-dimensional rectangular coordinate system; reverse the six marked points in the reverse order of specific rotation; connect the six points to form a living arch The rod structure of the bone; the rod structure connecting 7 tarsal bones and 5 metatarsals constitutes the arch rod system; a new method for foot statics, dynamics analysis and optimal calculation of the foot wear structure is formed, with the rod structure With a sufficient mechanical model, mechanical analysis can be carried out as needed.

Description

technical field [0001] The invention relates to the technical field of biomedical engineering, in particular to a method for constructing a foot arch rod system structure based on the main axis of the living bone inertia of the arch of the foot. Background technique [0002] Many bones in the human body appear in pairs, and the symmetrical tarsal bones and metatarsal bones of the left and right feet form a symmetrical arch. Is there a difference in the symmetry of the arch structure between our left and right feet? If so, how does this difference affect our basic behavior? Does it still follow the principle of "structure and function are unified"? In order to ascertain these problems, it is necessary to establish a mechanical model of the arch structure for mechanical analysis. [0003] For the law analysis of the force and force transmission of the structure, the finite element method not only has high calculation accuracy, but also can adapt to various complex shapes. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G16H50/50
Inventor 范毅方
Owner FUJIAN NORMAL UNIV
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