Method for preparing orthopaedic implants

An orthopaedic implant and mixture technology, applied in the field of orthopaedic implant preparation, can solve the problems that traditional processing technology cannot meet the rapidly growing demand, difficult to automate mass production, low utilization rate of raw materials, etc., and achieve excellent biocompatibility and mechanical properties, high utilization rate of raw materials, and the effect of reducing material consumption

Inactive Publication Date: 2015-07-15
THE THIRD XIANGYA HOSPITAL OF CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most orthopedic implant products rely on foreign imports, so the price is expensive
Most orthopedic implants have complex three-dimensional structures (such as external grooves, external threads, etc.), and domestic companies usually use traditional machining techn

Method used

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  • Method for preparing orthopaedic implants
  • Method for preparing orthopaedic implants
  • Method for preparing orthopaedic implants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of the orthopedic implant of the present invention, the orthopedic implant can be used for the spine, the method comprises the following steps:

[0025] (1) Feed preparation: the raw material powder is 316L stainless steel powder with an average particle size of 22 μm, the binder is composed of 37% polypropylene, 25% vegetable oil and 38% paraffin (by mass percentage), and the 316L stainless steel The powder and the binder are mixed at a mass ratio of 92:8, and the resulting mixture is put into a kneader, kneaded at 180° C. for 1 hour, crushed and granulated after cooling to obtain granular feed.

[0026] (2) Injection molding: feed the granular feed into the injection machine and feed it to the mold (see figure 1 and figure 2 ) for injection, the injection temperature is 160°C, the injection pressure is 10MPa, and the injection rate is 90% of the system injection rate. 8MPa, hold the pressure for 2s, and cool for 20s to obtain a green body.

[...

Embodiment 2

[0031] A preparation method of the orthopedic implant of the present invention, the orthopedic implant can be used for the spine, the method comprises the following steps:

[0032] (1) Feed preparation: The raw material powder is 17-4PH stainless steel powder with an average particle size of 22 μm, and the binder is composed of 40% polypropylene, 20% vegetable oil and 40% paraffin (by mass percentage). 17-4PH stainless steel powder and binder are mixed at a mass ratio of 90:10, and the resulting mixture is put into a kneader, kneaded at 180°C for 1 hour, crushed and granulated after cooling to obtain granular feed.

[0033] (2) Injection molding: feed the granular feed into the injection machine and feed it to the mold (see figure 1 and figure 2 ) for injection, the injection temperature is 155°C, the injection pressure is 9MPa, and the injection rate is 80% of the system injection rate. 7MPa, hold the pressure for 2s, and cool for 25s to obtain a green body.

[0034] (3) ...

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Abstract

The invention discloses a method for preparing orthopaedic implants. The method comprises the steps that metal powder or ceramic powder is mixed with a binding agent and then is heated, mixed, cooled and granulated to obtain a feed; the feed is injected into a mold under the proper injection temperature, injection pressure and injection rate, the mold temperature ranges from 30 DEG C to 45 DEG C, the pressure of the mold ranges from 2 MPa to 10 MPa, and after pressure maintaining and cooling, a green body is obtained; solvent degreasing and heat degreasing are carried out on the green body successively to obtain a degreasing green body; the degreasing green body is placed in a sintering furnace and is heated to 800 DEG C to 1100 DEG C under the vacuum, and then heated to 1300 DEG C to 1600 DEG C under the argon atmosphere to be sintered for 90 min to 300 min, and the orthopaedic implants are obtained. According to the preparation method, one-time forming and mass production of the orthopaedic implants can be achieved, and the orthopaedic implants are high in raw material utilization rate and low in cost.

Description

technical field [0001] The invention belongs to the technical field of preparation of orthopedic implants, in particular to a method for preparing orthopedic implants by metal injection molding technology. Background technique [0002] With the continuous development and progress of our society, the spectrum of orthopedic injuries has undergone significant changes, for example: polio, bone and joint tuberculosis, osteomyelitis and other diseases have decreased significantly, while the trauma caused by the increasing incidence of urban and rural traffic accidents At the same time, my country's population is aging, and fractures and osteoarthritis caused by senile osteoporosis will also increase year by year. Orthopedic implants are necessary medical supplies for surgical treatment of such bone trauma and joint diseases. Factors such as my country's population getting rid of extreme poverty and the emphasis on quality of life will make my country's demand for orthopedic implan...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F1/00
Inventor 王国慧朱晒红卢仁伟杨忠臣
Owner THE THIRD XIANGYA HOSPITAL OF CENT SOUTH UNIV
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