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Artificial joint made from zirconia-alumina composite ceramic

A technology of composite ceramics and artificial joints, applied in hip joints, internal bone synthesis, joint implants, etc.

Inactive Publication Date: 2002-12-18
PANASONIC HEALTHCARE HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to increase wear resistance and provide smooth joint motion during long-term in vivo use of artificial joints, there is still room for further improvement in conventional artificial joints.

Method used

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  • Artificial joint made from zirconia-alumina composite ceramic
  • Artificial joint made from zirconia-alumina composite ceramic
  • Artificial joint made from zirconia-alumina composite ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (Example 1 and Comparative Examples 1-3)

[0038] Tetragonal zirconia powder (amount of tetragonal zirconia: 98% by volume), which contained 10 mol% of ceria, 0.05 mol% of titania and 0.05 mol% of calcium oxide relative to the total amount of zirconia, was compared with The alumina powder was mixed with 30% by volume of the total volume of the zirconia-alumina composite ceramics to obtain a mixed powder. After the mixed powder was molded by unidirectional pressing and isostatic pressing to obtain a compact with a desired shape, the compact was pressurelessly sintered at 1400°C for 5 hours under atmospheric pressure. Thus, the zirconia-alumina composite ceramic of Example 1 having an average particle diameter of 0.22 μm was obtained. In order to evaluate the wear resistance and friction coefficient of this composite ceramic, a dial wear test was performed with distilled water as lubricant.

[0039] As a comparative example, an alumina sintered body having an average pa...

Embodiment 2-5

[0063] (embodiment 2-5 and comparative example 4)

[0064] Tetragonal zirconia powder (amount of tetragonal zirconia: 98% by volume), which contains 10 mol% of ceria and 0.05 mol% of titania relative to the total amount of zirconia, was compounded with zirconia-alumina 35% by volume of the total volume of the ceramics was mixed with alumina powder to obtain a mixed powder. After the mixed powder was molded by unidirectional pressing and isostatic pressing to obtain a compact of desired shape, as shown in Table 2, the compact was sintered without pressure for 5 hours at different temperatures and atmospheric pressure. Thus, the zirconia-alumina composite ceramics of Examples 2-5 and Comparative Example 4 were obtained. In Comparative Example 4, since the sintering temperature was 1600° C., the average grain size of the obtained composite ceramic was 1.65 μm, which was inconsistent with the composite ceramic of the present invention. After performing heat treatment and polishi...

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Abstract

An artificial joint made of zirconia-alumina composite ceramics, which includes a first bone component and a second bone component. One end of the second bone component is slidingly engaged with a part of the first bone component to form a joint part, wherein At least one of the first bone component and the second bone component are formed from a zirconia-alumina composite ceramic including a matrix phase composed of zirconia particles and a second phase composed of alumina particles dispersed therein. phase, the zirconia particles contain ceria as a stabilizer, the amount of ceria is such that the matrix phase is mainly composed of tetragonal zirconia, and the zirconia-alumina composite ceramic has a thickness of 0.1-1 μm, preferably 0.1-0.8 μm. , an average particle size of 0.1-0.65 μm is particularly preferred. This artificial joint provides good movement of the joint with high reliability over the long term.

Description

technical field [0001] The present invention relates to an artificial joint made of zirconia-alumina composite ceramics, which has excellent wear resistance and high mechanical strength, and can provide high reliability, good joint movement and activities for a long time . Background technique [0002] In the past, artificial joints have been used to restore movement and mobility to patients with damaged or arthritic joints. For example, conventional artificial hip joints consist of an acetabular cup of ultra-high molecular weight polyethylene and bone components of cobalt-chromium alloys or ceramics such as alumina or zirconia. The bony component has a generally spherical head that is in sliding engagement with the inner surface of the acetabular cup to provide articulation of the artificial hip joint. When using polyethylene in combination with metal or ceramic materials, the amount of wear of polyethylene is much greater than that of metal or ceramic materials. In rece...

Claims

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Application Information

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IPC IPC(8): A61B17/86A61F2/00A61F2/30A61F2/32A61F2/34A61F2/36A61L27/42
CPCA61B17/86A61F2/32A61F2/36A61F2/3662A61F2/367A61F2/3676A61F2002/30322A61F2002/30332A61F2002/30787A61F2002/30968A61F2002/3401A61F2002/3611A61F2002/365A61F2220/0033A61F2250/0026A61F2310/00197A61F2310/00203A61F2310/00221A61F2310/00227A61F2310/00239A61L27/427A61L2430/24
Inventor 名和正弘松下富春金丸守贺中村孝志
Owner PANASONIC HEALTHCARE HLDG CO LTD
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