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Design method for filling porous grid structure in bone implantation body

A design method and grid structure technology, applied in the field of biomedicine, can solve problems such as unstable performance and geometric contour distortion, and achieve the effect of reducing the equivalent elastic modulus, good mechanical properties, and realizing lightweight

Active Publication Date: 2016-10-12
BEIJING UNIV OF TECH
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Problems solved by technology

However, the defect of this method is also obvious. After the Boolean operation, the outer contour of the geometric shape often appears a staircase phenomenon, resulting in distortion of the geometric contour, and the performance is often unstable.

Method used

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  • Design method for filling porous grid structure in bone implantation body
  • Design method for filling porous grid structure in bone implantation body
  • Design method for filling porous grid structure in bone implantation body

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Embodiment approach

[0032] The design process of the human bone porous mesh structure implant of the present invention is as attached figure 1 , The specific implementation is as follows:

[0033] Step 1: Use medical imaging technology to obtain the tomographic data of the patient’s bone defect, extract its contour data through image processing, and then import the three-dimensional reconstruction software mimics to obtain a bone entity model with individual matching, including a complete bone model and For the defective bone model, convert the model file format to STL;

[0034] Step 2: Open the 3D model processing software Magics, import the STL model of the skeleton into Magics, compare the complete bone and the defect bone, use the cutting tool in the toolbar to intercept the complete bone and the bone model of the same size as the defect, and save the model;

[0035] Step 3: Import the bone model intercepted and saved in Step 2 into Magics. Use the marking function of the software to select and mar...

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Abstract

A design method for an implantation body porous grid structure is characterized in that regional filling of an implantation body with a porous grid array is carried out by Boolean operations. The method is characterized in that a three-dimensional solid model of a defected human body bone is acquired by a medical imaging technology (CT); and according to elastic modulus distribution of the human body bone, namely the elastic modulus of a compact bone is 12-23.3 GPa and the elastic modulus of a cancellous bone is 6-10 GPa, regional grid filling is carried out to the extracted artificial bone model, wherein titanium or medical titanium alloy is taken as the filling material. The method can effectively reduce an equivalent elastic modulus of an implantation body, so that the implantation body can have good mechanical properties in a human body.

Description

Technical field [0001] The design of the present invention is a filling method of a grid structure for reducing the elastic modulus of a bone implant, and belongs to the field of biomedicine. Background technique [0002] The structural titanium alloys used in implants (such as hip joints and tooth roots) are mainly used to repair and replace the hard tissues of the human body. Therefore, they must have high strength and fatigue life (that is, fatigue strength). At the same time, in order to achieve uniform stress transfer between the implant and the bone, they should also have a low elastic modulus close to that of human cortical bone. When manufacturing biomedical titanium alloys, non-toxic alloy elements should be used, and the risk of metal allergy should also be considered. After a large number of experiments, it has been shown that elements such as Nb, Ta, Zr, and Sn have good biocompatibility and small Toxic, it is considered a safe biomedical alloy element. [0003] Howev...

Claims

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Application Information

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IPC IPC(8): A61F2/28
CPCA61F2/28
Inventor 张冬云徐仰立曹玄扬冯喆
Owner BEIJING UNIV OF TECH
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