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Method for processing surface of superhigh molecular weight polyethylene artificial cotyla

An ultra-high molecular weight, artificial joint technology, applied in the field of surface treatment of ultra-high molecular weight polyethylene artificial joints, can solve the problems of high-energy particle injection method, complex equipment, reinforced ultra-high molecular weight polyethylene, and high technical requirements for staff. The treatment effect is uniform, the process is simple, and the process is environmentally friendly.

Inactive Publication Date: 2010-08-04
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-energy particle implantation method refers to injecting nitrogen and oxygen plasma with energy up to hundreds of Kev into ultra-high molecular weight polyethylene on the surface of ultra-high molecular weight polyethylene artificial joint socket through a high-energy ion implanter. The surface induces crosslinking, thereby improving its wear resistance; however, the implanted high-energy ions will also enhance the shear strength of UHMWPE, enhance the surface roughness of UHMWPE, and increase its friction coefficient. The surface of high molecular weight polyethylene forms a good biological lubrication state, and the high-energy particle injection method has complicated equipment and high technical requirements for the staff

Method used

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  • Method for processing surface of superhigh molecular weight polyethylene artificial cotyla
  • Method for processing surface of superhigh molecular weight polyethylene artificial cotyla
  • Method for processing surface of superhigh molecular weight polyethylene artificial cotyla

Examples

Experimental program
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specific Embodiment approach

[0022] A specific embodiment of the present invention is: a surface treatment method of ultra-high molecular weight polyethylene artificial joint socket, the specific steps of which are:

[0023] A. Put the ultra-high molecular weight polyethylene artificial joint socket into the vacuum chamber of the electron cyclotron resonance microwave plasma chemical vapor deposition device, and the vacuum chamber is evacuated to 2×10 -3 Pa;

[0024] B. Introduce oxygen into the vacuum chamber until the pressure is 2Pa;

[0025] C. Set the microwave source power of the deposition device to 400W, turn on the microwave power supply, perform gas discharge, and form plasma; at the same time, turn on the bias power supply of the deposition device, and carry out surface treatment on the artificial joint socket for 10 minutes, and the bias power supply during processing The frequency is 15kHZ, the duty cycle is 10%, and the amplitude is -300V.

[0026] The artificial joint socket obtained afte...

Embodiment 2

[0035] The method of this example is basically the same as that of Example 1, except that in the B step, the vacuum chamber is filled with argon.

[0036] Figure 4 It is the wear morphology diagram after the friction and wear test of the UHMWPE artificial joint socket treated by the method of this example. The experimental conditions are the same as the friction experiment in Example 1. Depend on Figure 4 It can be seen that the artificial joint socket treated by the argon plasma method in this example has no cracking and peeling except for a small amount of plastic deformation and furrow, indicating that the wear resistance of the surface of the UHMWPE artificial joint socket has been improved. Embodiment 3-12

Embodiment 3～12

[0037] The operation of embodiment 3~12 is basically the same as embodiment 1, and the concrete parameter during just operation changes to some extent, and its concrete parameter is as follows: (for the convenience of comparison, the parameter of embodiment 1 and embodiment 2 is also listed in the table .)

[0038]

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Abstract

The invention provides a method for processing a surface of a superhigh molecular weight polyethylene artificial cotyla. The method comprises the following steps: A, placing the superhigh molecular weight polyethylene artificial cotyla in a vacuum chamber of an electron cyclotron resonance microwave plasma chemical vapor deposition device, and vacuumizing until the pressure is 0.5*10<-3> to 2*10<-3>Pa; B, introducing oxygen or argon into the vacuum chamber until the pressure is between 0.5 and 2.5Pa; and C, setting the microwave source power of the deposition device to be between 400 and 800W, starting a microwave power supply, and starting a bias power supply to process the artificial cotyla for 10 to 30 minutes, wherein the frequency of the bias power supply is between 15 and 40kHZ, the duty cycle is between 10 to 50 percent, and the amplitude is between negative 100 and negative 500V. The method has the advantages of eliminating the weak boundary layer on the surface of the artificial cotyla, improving the surface cross-linking degree, improving the surface hardness and the abrasion resistance, and avoiding changing the performance of artificial cotyla substrate, along with environmental protection, no pollution and simple operation.

Description

technical field [0001] The invention relates to a surface treatment method for an artificial joint socket of ultra-high molecular weight polyethylene. Background technique [0002] With the advent of an aging society, the incidence of osteoarthritis is increasing. Artificial joint replacement is currently the most effective method for treating severe osteoarthritis. According to incomplete statistics, there are 800,000 total hip replacements worldwide every year. With the development of society, technology and medicine, the demand for artificial joints and artificial joint materials will increase. [0003] The artificial joint socket made of ultra-high molecular weight polyethylene material and the joint head made of metal or ceramics are the artificial joint friction pairs commonly used in clinical practice. The ultra-high molecular weight polyethylene material for artificial joint sockets requires softness and wear resistance: softness can make the joint socket fit well ...

Claims

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Application Information

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IPC IPC(8): A61L27/16
Inventor 冷永祥谢东黄楠王进陈俊英杨苹孙鸿
Owner SOUTHWEST JIAOTONG UNIV
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