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Artificial joint member made of polymeric material

A technology of polymer materials and artificial joints, applied in the field of artificial joint parts made of polymer materials, can solve the problems of lack of elasticity, damage, and load imposed on bones.

Inactive Publication Date: 2004-12-22
KOBE STEEL LTD +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the combination of the cobalt-chromium alloy bone and the cobalt-chromium alloy cup (acetabulum), the wear powder produced by the mutual friction between the cobalt-chromium alloys is inherently cytotoxic, so long-term use will endanger safety.
[0007] In addition, since the alumina material is a brittle material, the combination of the alumina bone and the alumina cup (acetabulum) may be damaged during operation or postoperative use, and further improvement is needed for its practical application.
[0008] In addition, since these hard parts are inflexible rigid bodies and have no cushioning function such as the ultra-high molecular weight polyethylene, etc., there is no cushioning effect on external forces, thereby directly applying load to the bone, so it is not ideal.

Method used

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  • Artificial joint member made of polymeric material
  • Artificial joint member made of polymeric material
  • Artificial joint member made of polymeric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0042] Example I: About wettability

[0043] As an index of the wettability of the artificial joint component, the wettability of the liquid is first evaluated.

[0044] A polymer layer having phosphorylcholine groups was formed on the surface (only one side) of an ultra-high molecular weight polyethylene square bar (cross section: 20 mm×20 mm, length: 50 mm) with a molecular weight of 3 million to 5 million by the following method.

[0045] First, the ultra-high molecular weight polyethylene square bar was immersed in an acetone solution containing benzophenone (1.0 g / dL) for 30 seconds, and then immediately taken out to remove the solvent at room temperature.

[0046] After sufficiently degassing an aqueous solution containing 0.5 mol / L of MPC (2-methacryloyloxyethyl phosphorylcholine), the square bar that sufficiently adsorbs benzophenone is immersed in the aqueous solution, and then , The bar is irradiated with ultraviolet light with a wavelength of 300-400nm at a liquid tempe...

Embodiment II

[0051] Example II: Regarding the coefficient of friction

[0052] Next, the lubricity of artificial joint components is evaluated by the coefficient of friction.

[0053] On the test piece obtained in the same manner as in Example 1, the pure water used as a lubricating fluid was pressed against the end surface of the metal round bar with a diameter of 5 mm as shown in Table 2. The vertical pressure applied to the contact surface is 1N / cm 2 Then, at a speed of 100mm / min, the friction coefficient when only the round bar slides on the surface of the square bar is obtained. The results are also recorded in Table 2.

[0054] Type of metal

[0055] It can be seen from Table 2 that when the MPC polymer is formed, the friction coefficient is small and the lubricity is significantly improved. This is because the MPC polymer with a few molecular layers formed on the surface increases the hydrophilicity, thereby forming a molecular layer with a free water content of up to about 90...

Embodiment III

[0056] Example III: Rotating and shaking abrasion test (I)

[0057] As a model of the artificial joint, an ultra-high molecular weight polyethylene cup was used for the acetabulum, and a stainless steel sphere was used for the bone, and a rotating and shaking abrasion test was performed.

[0058] figure 2 It is a diagram showing the device used in the rotating and shaking wear test. A cup made of ultra-high molecular weight polyethylene (molecular weight 3 to 5 million) 1 having a hemispherical recess 2 with a diameter of 12.10 mm is mounted on the spindle B that freely rotates along the spindle XX. On the one hand, a stainless steel (SUS316) steel ball 3 with a diameter of 12.00mm is installed on the jig, and the steel ball 3 is pressed against the concave surface 2 of the inner wall of the cup 1 by air pressure with a force F. Then, in this state, the steel ball The support shaft of 3 rotates in a state inclined by an arbitrary angle θ with respect to the main shaft XX. In add...

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Abstract

An artificial joint member made of a polymeric material including a portion made of a polymeric substance has a sliding surface composed of a polymer having phosphoryl choline groups. With such an arrangement, the artificial joint member is provided with a sliding part capable of keeping a satisfactory lubricating state for a long time.

Description

Technical field [0001] The present invention relates to an artificial joint component made of a polymer material, and more particularly to an artificial joint component made of a polymer material capable of maintaining the lubrication state of a sliding part well for a long time. Background technique [0002] In order to provide a good lubrication state to the sliding part of the artificial joint, considering the structure of the actual internal joint part in the human body, it is preferable that the structure is arranged such that fine whisker-like substances such as cilia are arranged on the sliding surface of the joint component, and in the cilia-like substance It can maintain the structure of body fluid as lubricating fluid. However, this state is difficult to reproduce manually, and it is even more difficult to maintain the state for a long time, and it has not been achieved so far. [0003] At present, as artificial joint parts such as bones and acetabulums, a combination o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/00A61F2/30A61F2/32A61F2/34A61F2/36A61F2/46A61L27/34A61L27/50
CPCA61F2310/00203A61F2002/30673A61F2310/00029A61F2/32A61L2430/24A61F2002/3611A61L27/50A61L27/34A61F2310/00017A61F2/34A61F2310/00239A61F2/30767A61F2/30A61F2002/30685B29K2995/0087B29L2031/7532A61F2/468A61F2002/30934C08L101/02
Inventor 石原一彦中村耕三茂吕彻高取吉雄川口浩金野智浩松下富春楠本修司
Owner KOBE STEEL LTD
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