Thighbone biomechanics finite element analysis system based on force feedback

A technology of biomechanics and analysis system, applied in the field of femur modeling software development, can solve the problems of unpopular application, low success rate of external surgery, complicated operation, etc., and achieve the effect of increasing immersion, small memory, and simple program operation

Inactive Publication Date: 2013-09-18
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a femoral biomechanical finite element analysis system based on force feedback, to solve the problem that the existin

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  • Thighbone biomechanics finite element analysis system based on force feedback
  • Thighbone biomechanics finite element analysis system based on force feedback
  • Thighbone biomechanics finite element analysis system based on force feedback

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specific Embodiment approach 1

[0020] Specific implementation mode one: as figure 1 As shown, a kind of femoral biomechanical finite element analysis system based on force feedback described in this embodiment includes:

[0021] Femoral CT image gray value extraction module 1, femoral elastic modulus assignment module 2, femoral biomechanics finite element analysis module 3, force feedback module 4;

[0022] Femur CT image gray value extraction module 1, is used for importing the CT image of multiple formats, and this image is stored as the space three-dimensional data matrix with gray value as element; Femoral CT image gray value extraction module 1 is also used for Preprocessing the obtained CT gray value information: using the gray threshold method to screen out the femur, and manually erasing the data of noise and adhesion tissue on the edge, and retaining the three-dimensional data matrix with the femur as the research object;

[0023] The femoral modulus of elasticity assignment module 2 is used to o...

specific Embodiment approach 2

[0028] Specific implementation mode two: as Figure 1-7 As shown, in the present embodiment, the concrete process that described femoral modulus of elasticity assignment module 2 realizes its function is:

[0029] 1) Calculate the center of the tetrahedron

[0030] The node coordinates can be obtained from the finite element mesh model, and the inner coordinates can be calculated through the four node coordinates of the tetrahedron; let the tetrahedron A 1 A 2 A 3 A 4 Vertex A of i The area of ​​the opposite side is S i (i=1, 2, 3, 4), vertex A i The coordinates are (x i ,y i ,z i )(i=1, 2, 3, 4), the coordinates of the center of the tetrahedron are (x 1 ,y 1 ,z 1 ),but

[0031] x 1 = s 1 x ...

specific Embodiment approach 3

[0078] Specific implementation mode three: as Figure 1-7 As shown, in the present embodiment, the specific process of the biomechanical finite element analysis module 3 of the femur to realize its function is as follows:

[0079] The finite element method is a numerical method for approximately solving general continuous domain problems, and the numerical solution is obtained by using the finite element method to solve the problem. The process of solving it includes discrete, set, establishment of differential equations, linear algebraic equations and solving. Displacement is often selected as the unknown quantity for series equations, and the principle of minimum potential energy and principle of virtual work are often used for solving. Specific steps are as follows:

[0080] 1) Discretization of structure:

[0081] The first step in finite element analysis is the discretization of the structure. When dealing with the tissue structure of the irregular surface, it is discr...

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Abstract

The invention relates to the field of thighbone modeling software development, discloses a thighbone biomechanics finite element analysis system based on force feedback, and aims to solve the problems that the conventional thighbone modeling analysis software is very complicated to operate, and has lower success rate to guide an external operation. A thighbone CT image gray value extraction module is used for leading various-format CT images; a thighbone elasticity modulus assignment module is used for acquiring inner coordinates of corpus femoris grid cells; a thighbone biomechanics finite element analysis module is used for calculating the stiffness matrix of each corpus femoris grid cell through the elasticity modulus of each corpus femoris grid cell; a force feedback module is used for simulating the mechanical properties, including size and direction, of test points according to the strain data and stress data and also for transmitting the size and direction of a force to a control handle of an external force sensing device; a force feedback device after data conversion can output the force generated when the thighbone actually deforms, and truly percept the biomechanical characteristic of a thighbone model.

Description

technical field [0001] The invention relates to a femur biomechanical finite element analysis system based on force feedback, and relates to the field of femur modeling software development. Background technique [0002] In recent years, virtual reality technology at home and abroad has been fully developed in the medical field. For example, Tokyo Institute of Technology in Japan has developed a new minimally invasive virtual surgery system. Based on the self-developed software, doctors can conduct simulated surgical training in combination with external hardware devices such as virtual reality glasses and virtual force feedback systems. The CHAI3D open source library is developed by the United States. It is a set of haptic library developed for the key technology of force feedback in virtual surgery. The haptic library has been applied by more than 100 top hospitals in the world. A set of virtual surgery system called "tactile operating table" has also been developed in Au...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 王沫楠安贤俊
Owner HARBIN UNIV OF SCI & TECH
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