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Cobalt alloy partition bone trabecula femoral stem and preparation method

A technology of trabecular bone and cobalt alloy, applied in the direction of femoral head, femoral shaft, metal processing equipment, etc., can solve the problems of surface coating peeling, sudden change of cross section, stress concentration, etc., and achieve excellent compression resistance and enhanced plasticity Effect

Pending Publication Date: 2021-01-01
JIASITE HUAJIAN MEDICAL EQUIP (TIANJIN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface coating in the first method has the risk of falling off, which affects the use effect
The cuff in the second method is an assembly structure with the femoral stem. Clinical studies have shown that in order to combine the femoral stem with the cuff in the structural design, there is a problem of sudden change in the section of the head and neck of the stem in the structural design. There are very serious stress concentrations
However, the solid part of 3D printing products is prone to problems such as uneven microstructure and internal defects, and the mechanical properties are not good; the powder in the structure of the trabecular bone is not well sintered, and the mechanical properties are poor.

Method used

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  • Cobalt alloy partition bone trabecula femoral stem and preparation method
  • Cobalt alloy partition bone trabecula femoral stem and preparation method
  • Cobalt alloy partition bone trabecula femoral stem and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of cobalt alloy partition bone trabecular femoral stem comprises the following steps:

[0038] 1) Using cobalt alloy powder as raw material, the first intermediate product of cobalt alloy partitioned trabecular femoral stem is obtained through 3D printing, and the first intermediate product is put into a hot isostatic pressing furnace, under the protection of helium, Raise the temperature to 1140°C, place it at a constant temperature of 170MPa for 3 hours, drop to normal pressure, cool down to below 200°C with the furnace, take it out, and obtain the second intermediate product:

[0039] 2) Place the second intermediate product in a programmed cooling box to cool down to -80°C at a rate of 1°C / min, place it at a constant temperature for 10 hours, and take it out of the programmed cooling box; place it in liquid nitrogen for another 16 hours, and adjust the temperature to Room temperature, obtains the 3rd intermediate product;

[0040] 3) Place th...

Embodiment 2

[0053] The preparation method of cobalt alloy partition bone trabecular femoral stem comprises the following steps:

[0054] 1) Using cobalt alloy powder as raw material, the first intermediate product of cobalt alloy partitioned trabecular femoral stem is obtained through 3D printing, and the first intermediate product is put into a hot isostatic pressing furnace, under the protection of helium, Raise the temperature to 1170°C, place it at a constant temperature of 140MPa for 2 hours, drop to normal pressure, cool down to below 200°C with the furnace, take it out, and obtain the second intermediate product:

[0055] 2) Place the second intermediate product in a programmed cooling box to cool down to -100°C at a rate of 1°C / min, place it at a constant temperature for 7 hours, and take it out of the programmed cooling box; place it in liquid nitrogen for another 24 hours, and adjust the temperature to Room temperature, obtains the 3rd intermediate product;

[0056] 3) Place th...

Embodiment 3

[0068] The preparation method of cobalt alloy partition bone trabecular femoral stem comprises the following steps:

[0069] 1) Using cobalt alloy powder as a raw material, the first intermediate product of cobalt alloy partitioned trabecular femoral stem is obtained through 3D printing, and the first intermediate product is placed in a hot isostatic pressing furnace, under the protection of argon, Raise the temperature to 1200°C, place it at a constant temperature of 110MPa for 1 hour, drop to normal pressure, cool down to below 200°C with the furnace, take it out, and obtain the second intermediate product:

[0070] 2) Place the second intermediate product in a programmed cooling box to cool down to -120°C at a rate of 1°C / min, place it at a constant temperature for 5 hours, and take it out of the programmed cooling box; place it in liquid nitrogen for another 36 hours, and adjust the temperature to Room temperature, obtains the 3rd intermediate product;

[0071] 3) Place t...

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Abstract

The invention discloses a cobalt alloy partition bone trabecula femoral stem and a preparation method. The preparation method comprises the steps that cobalt alloy powder serves as a raw material, anintermediate product of the cobalt alloy partition bone trabecula femoral stem is integrally formed through 3D printing, and the cobalt alloy partition bone trabecula femoral stem is obtained throughhot isostatic pressing and cryogenic cooling. The cobalt alloy partition bone trabecula femoral stem structurally comprises a cylindrical head part, a neck part and a stem part. The stem part comprises a stem part near end and a stem part far end. Bone trabecula with different pore diameters and porosities is arranged on the outer surface of the stem part near end, and the bone trabecula is high in bonding strength with a solid body and not prone to falling off. The problems of bone resorption and the like caused by too small or too large compressive strain values of thighbones in the lower areas of the outer side and the inner side of the uniform bone trabecula are solved. The uniform growth of the bone in the trabecular region is ensured.

Description

technical field [0001] The invention relates to the technical field of artificial joints, in particular to a cobalt alloy partitioned trabecular femoral stem. Background technique [0002] Artificial hip replacement surgery is one of the most important and effective operations for the treatment of end-stage diseases such as femoral head necrosis, hip dysplasia, degenerative hip osteoarthritis, rheumatoid arthritis, etc. , such patients are increasing year by year. [0003] Currently clinically used artificial hip joint prosthesis includes bone cement fixed prosthesis and non-cement fixed prosthesis. Among them, the non-cemented prosthesis has been more and more widely used because of its good bone ingrowth performance. [0004] The osseointegration interface of non-cemented hip prosthesis usually adopts the following two methods: the first is spraying hydroxyapatite coating or titanium coating on the surface of the femoral stem, and the second is printing trabecular bone-l...

Claims

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Application Information

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IPC IPC(8): A61F2/36A61F2/30C22C19/07B22F3/11B22F3/15B33Y10/00B33Y70/00B33Y40/20
CPCA61F2/30942A61F2/3662A61F2/367A61F2/3672A61F2/3676A61F2002/30011A61F2002/30092A61F2002/30985A61F2002/3625A61F2002/3674A61F2310/00029B22F3/11B22F3/15B33Y10/00B33Y70/00B33Y40/20C22C19/07
Inventor 提浩强叶金铎徐福东何伟李莉
Owner JIASITE HUAJIAN MEDICAL EQUIP (TIANJIN) CO LTD
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