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Intervertebral fusion device and method of preparing the same

An intervertebral cage and cuboid technology, which is applied in the application field of biomedical composite materials, can solve the problems of poor bone conduction, unstable mechanical properties, and increase the brittle fracture of the intervertebral cage, so as to reduce complications and enhance early fixation. Reasonable effect of braking action, shape and structure design

Inactive Publication Date: 2008-09-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned works all use high-molecular polymer materials, so there are disadvantages such as poor bone conduction ability, easy degradation and degeneration, and unstable mechanical properties.
The use of sintered hydroxyapatite increases the risk of brittle fracture of the fusion cage

Method used

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  • Intervertebral fusion device and method of preparing the same
  • Intervertebral fusion device and method of preparing the same
  • Intervertebral fusion device and method of preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Using diamond assorted files and CNC machine tools as the main tools, the three-dimensional carbon fiber braided C / C is processed into an external dimension of 25mm×14mm×11mm according to the structural requirements of the attached drawing, with 45° end chamfer 4 and upper and lower surfaces Intervertebral cage with triangular teeth 2 height 0.5 mm. The upper and lower through holes 5 (length 19mm, width 7mm) and drainage holes 3 (length 8mm, width 4mm, with a reinforcing rib 1 of width 3mm reserved between the two holes) are processed at a drilling speed of 12000 rpm and a small feed rate;

[0025] (2) SiC micropowder with an average particle size of 11 μm was selected as the medium, and the upper and lower surfaces of the intervertebral cage were pretreated by sandblasting for 2 minutes under a carrier pressure of 0.3 MPa;

[0026] (3) Select HA powder with a particle size of 38-75 μm, adopt subsonic plasma spraying method, spray powder at a distance of 70mm, volt...

Embodiment 2

[0030] (1) Using diamond assorted files and CNC machine tools as the main tools, the three-dimensional carbon fiber braided C / C was processed into an intervertebral fusion cage with an outer dimension of 25mm×11mm×11mm according to the structural requirements of the attached drawings. The upper and lower through holes 5 are 19mm long and 5mm wide, and other dimensions are the same as in Embodiment 1;

[0031] (2) Select Al with an average particle size of 140 μm 2 o 3 Sand is used as the medium, and the upper and lower surfaces of the intervertebral cage are pretreated by sandblasting for 1 min under a carrier pressure of 0.2 MPa;

[0032] (3) Under the conditions of spraying distance of 80mm, voltage of 42V, current of 700A and other spraying parameters unchanged, a HA coating with a thickness of 76μm can be prepared on the upper and lower surfaces of the intervertebral cage. Carry out vacuum heat treatment identical with above embodiment to product;

[0033] (4) A bone-li...

Embodiment 3

[0035](1) Process the C / C reinforced with three-dimensional carbon fiber braid into an intervertebral fusion device with an external dimension of 25mm×16mm×13mm according to the structural requirements of the attached drawings. The upper and lower through holes 5 are 19mm long and 8mm wide, and other dimensions are the same as in Embodiment 1.

[0036] (2) SiC sand with an average particle size of 140 μm was selected as the medium, and the upper and lower surfaces of the intervertebral cage were pretreated by sandblasting for 1 min under a carrier pressure of 0.2 MPa;

[0037] (3) When the spraying distance used in Example 2 was adjusted to 110 mm, and the moving speed of the spray gun was adjusted to 100 mm / s, an HA coating with a thickness of 142 μm was prepared on the upper and lower surfaces of the intervertebral cage. Carry out vacuum heat treatment identical with above embodiment to product;

[0038] (4) A bone-like apatite layer was prepared on the surface of the HA co...

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Abstract

The invention provides an interbody fusion cage for posterior lumbar spinal surgery and a preparation method thereof, and belongs to the application field of biomedical composite materials. The rectangular interbody fusion cage has side surface drainage through-holes, end surface chamfers, and triangle toothed structures on the upper and the bottom surfaces. The preparation method comprises the following steps of profiling the interbody fusion cage with carbon / carbon composite material as target, and preparing hydroxyapatite coating layers on the upper and the bottom surfaces of the interbody fusion cage sequentially by sandblasting pretreatment, plasma spraying, vacuum heat treatment and simulated body fluid immersion. The interbody fusion cage prepared by the inventive method has the advantages of novel material, advanced preparation method, reasonable structural design and good osteoconductivity function.

Description

technical field [0001] The invention belongs to the application field of biomedical composite materials, in particular to an intervertebral fusion device for posterior lumbar surgery and a preparation method thereof. Background technique [0002] Chronic low back pain caused by degenerative lumbar instability, lower extremity nerve compression symptoms, intermittent claudication, spinal slippage, lateral recess stenosis, and lumbar disc herniation in the same space are common diseases in orthopedics. Lumbar fusion is the most commonly used treatment. Cloward first proposed intervertebral body decompression and bone graft fusion in the 1950s, using the femoral ring as an autograft to form support and fusion between the upper and lower vertebral bodies. However, autografts have many disadvantages, such as delayed growth, absorption, collapse and easy displacement. Therefore, both at home and abroad have been devoting themselves to designing an intervertebral distraction fixa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/44A61B17/70A61L27/50
CPCA61F2/44A61F2002/30001
Inventor 李木森董建文马泉生吕宇鹏曹宁陈华英薛成骞
Owner SHANDONG UNIV
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