Medullary core three-dimensional decompressing device for treating avascular necrosis of femoral head as well as preparing and testing methods based on medullary core three-dimensional decompressing device

A technology of decompression device and testing method, which is applied in the directions of bone drill guidance, medical science, computer-aided planning/modeling, etc. It can solve problems such as prolonging operation time and increasing patient's X-ray radiation dose, and achieves reasonable production cost , easy to promote the effect

Inactive Publication Date: 2017-05-10
THE AFFILIATED HOSPITAL OF SOUTHWEST MEDICAL UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the clinical practice of fine-needle porous decompression, we found that positioning each channel w

Method used

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  • Medullary core three-dimensional decompressing device for treating avascular necrosis of femoral head as well as preparing and testing methods based on medullary core three-dimensional decompressing device
  • Medullary core three-dimensional decompressing device for treating avascular necrosis of femoral head as well as preparing and testing methods based on medullary core three-dimensional decompressing device
  • Medullary core three-dimensional decompressing device for treating avascular necrosis of femoral head as well as preparing and testing methods based on medullary core three-dimensional decompressing device

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preparation example Construction

[0027] see image 3 As shown, the present invention also provides a preparation method based on the above-mentioned three-dimensional decompression device for avascular necrosis of the femoral head, comprising the following steps:

[0028] Step S101. Import the patient's CT three-dimensional image data (general dicom format) into MIMICS software, extract the proximal femur bone data of the operation side by MIMICS software, and calculate and generate the 3D image of the proximal femoral bone;

[0029] Step S102. Create a mask of the proximal femoral bone in the MIMICS software, and set the expansion value of the mask; specifically, the expansion value of the mask is 6mm.

[0030] Step S103. Apply the generated mask to subtract the original bone image to obtain a new bone shell mask; specifically, the thickness of the new bone shell mask is 6 mm.

[0031]Step S104. Use MIMICS software to edit the new mask of the bone shell, only retain the bone surface area below the greater t...

specific example

[0044] 1. Determining the Anatomical Parameters of the Normal Human Proximal Femur

[0045] Randomly select 100 non-deformed hip joints from the CT imaging system of our hospital, and measure the proximal femoral neck-shaft angle, femoral neck diameter, femoral head diameter, and femoral neck axis length through the hospital's CT imaging system to determine the data distribution interval of each parameter.

[0046] 2. Design guidance system and production guidance system

[0047] After determining the anatomical parameters of the normal proximal femur, according to the parameters, the CDA software was used to first set up three digital samples of guides with different arrangements of decompression holes, and then the guide model was made by 3D printer, and tested on the normal femur model accuracy. After confirming that the guide works normally, the medical stainless steel metal guide and matching drill bits can be designed according to the parameters.

[0048] 3. In vitro e...

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Abstract

The invention provides a medullary core three-dimensional decompressing device for treating avascular necrosis of femoral head as well as preparing and testing methods based on the medullary core three-dimensional decompressing device, relating to the technical field of decompressing of the moral head. The medullary core three-dimensional decompressing device for treating avascular necrosis of the femoral head comprises a guide template, wherein the guide template is saddle-shaped in the whole, the inner side curve of the guide template attaches to the bone surface below the greater trochanter at the proximal femoral, a cylinder is arranged at the outer side of the guide template, a plurality of guide channels are arranged in the cylinder in a penetrating manner, and a plurality of through holes communicating with the guide channels are correspondingly formed in the guide template. The medullary core three-dimensional decompressing device can rapidly complete the multi-channel three-dimensional decompression for the necrotic femoral head.

Description

technical field [0001] The invention relates to the technical field of decompression of the femoral head, in particular to a three-dimensional decompression device for avascular necrosis of the femoral head and its preparation and testing methods. Background technique [0002] Osteonecrosis of the femoral head (ONFH), also known as avascular necrosis of the femoral head (AVNFH), is a common disease in orthopedics. The definition of necrosis of the femoral head (ONFH): ONFH is the interruption or damage of the blood supply to the femoral head, causing the death of bone cells and bone marrow components and subsequent repair, which in turn leads to changes in the structure of the femoral head and collapse of the femoral head, causing joint pain and joint function in patients. It is a common refractory disease in the field of orthopedics. ARCO staging (M.Schmitt-Sody, C.Kirchhoff, W.Mayer, M.Goebel, and V.Jansson, Avascular necrosis of the femoral head: inter- and intraobserver...

Claims

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Application Information

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IPC IPC(8): A61B17/17A61B34/10
CPCA61B17/17A61B17/1739A61B2017/00712A61B2017/00716
Inventor 王治
Owner THE AFFILIATED HOSPITAL OF SOUTHWEST MEDICAL UNIV
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