Artificial joint bearing surface micro-hole texture capable of improving lubricating performance and abrasion-resistant performance

A technology of artificial joints and surface micropores, applied in joint implants, joint implants, medical science, etc., can solve problems such as prosthesis loosening, adverse biological reactions of body cells, etc., to reduce friction and reduce direct contact area, the effect of reducing friction and wear

Active Publication Date: 2013-07-24
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the accumulation of wear debris in hard / hard artificial joints due to wear and tear, which can cause adverse biological reactions in body cells, thereby causing problems such as osteolysis around the prosthesis and loosening of the prosthesis. The present invention provides a The design method of the microporous texture of the bearing surface of the artificial joint that improves the lubrication and wear resistance greatly enhances the hydrodynamic pressure effect of the contact surface of the friction pair of the artificial joint, captures the action of wear debris and the effective bearing capacity, reduces friction and wear, Extended service life

Method used

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  • Artificial joint bearing surface micro-hole texture capable of improving lubricating performance and abrasion-resistant performance
  • Artificial joint bearing surface micro-hole texture capable of improving lubricating performance and abrasion-resistant performance
  • Artificial joint bearing surface micro-hole texture capable of improving lubricating performance and abrasion-resistant performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] see figure 1 : A microporous texture on the bearing surface of an artificial joint, comprising a joint head and an acetabular cup of an artificial joint, the material of the joint head and the joint acetabular cup is cobalt-chromium-molybdenum alloy, and the friction surface of the joint head is uniformly distributed with microporous A hole array, the shape of the microholes in the microhole array is circular, and the microholes are of equal size and same depth.

[0026] The diameter of the micropores is 300um, the aspect ratio is 0.12, and the area density of the micropores is 17%.

[0027] The surface-textured joint head is paired with an untreated joint cup, and under the condition of a load of 50 MPa and calf serum as a lubricant, friction and wear tests are carried out using a knee joint simulator. The measured friction coefficient of the joint pair is 0.05, which is lower than that of the all-metal artificial joint with smooth surface (0.07), and the annual wear ...

Embodiment 2

[0029] see figure 1 , figure 2 : A microporous texture on the bearing surface of an artificial joint, comprising a joint head and an acetabular cup of an artificial joint, the material of the joint head and the joint acetabular cup is a cobalt-chromium-molybdenum alloy, and the grinding of the joint head and the joint acetabular cup Microhole arrays are uniformly distributed on the surface, and the shape of the microholes in the microhole array is circular, and the microholes are of equal size and same depth.

[0030] The diameter of the micropores is 120um, the aspect ratio is 0.1, and the area density of the micropores is 10%.

[0031] The surface-textured joint head and the surface-textured joint acetabular cup pair were subjected to a friction and wear test using a knee joint simulator under the condition of a load of 50 MPa and calf serum as a lubricant. The measured friction coefficient of the joint pair is 0.06, which is lower than that of the smooth surface all-meta...

Embodiment 3

[0033] see image 3 : A microporous texture on the bearing surface of an artificial joint, comprising a joint head and an acetabular cup of an artificial joint, the material of the joint head and the joint acetabular cup is a cobalt-chromium-molybdenum alloy, and micropores are distributed on the friction surface of the joint head The shape of the microholes in the microhole array is circular, and the microholes have different sizes and the same depth.

[0034] The micropores of different sizes are distributed radially and alternately along the friction surface of the joint head.

[0035] The diameter of described smaller micropore is 80um, and aspect ratio is 0.1, and the area density of micropore is 16%; The diameter of described larger micropore is 200um, and aspect ratio is 0.04, and the area density of micropore is 16%. %.

[0036] The surface-textured joint head is paired with an untreated joint cup, and under the condition of a load of 50 MPa and calf serum as a lubri...

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Abstract

The invention relates to a designing method of an artificial joint bearing surface micro-hole texture capable of improving lubricating performance and abrasion-resistant performance. The artificial joint bearing surface micro-hole texture comprises a joint head of an artificial joint and a joint cup of the artificial joint, wherein the joint head and the joint cup are made of hard metal or alloy or coating or ceramic. At least one friction surface exists in mutual-friction surfaces of the joint head and the joint cup, namely the friction surfaces on the joint head or on the joint cup or between the joint head and the joint cup, and micro-hole arrays are distributed on the friction surfaces. The artificial joint bearing surface micro-hole texture has the advantages that the micro-hole texture can enable fluid hydrodynamic lubrication to be produced on the friction surfaces which are contacted mutually, squeezing liquid films with certain thicknesses are formed in friction pair contacting surfaces so that direct coarse contact of the contacting surfaces is reduced, and fiction coefficients are reduced, and therefore friction force is lowered and bearing capacity is improved. As an oil storage groove, the micro-hole texture lubricates boundaries or the friction surfaces when the joint is just started, abrasion scraps are captured, abrasion is reduced, and service life is prolonged.

Description

technical field [0001] The invention relates to the fields of artificial joint implantation equipment and biotribology, in particular to a design method of microporous texture on the bearing surface of artificial joints to improve lubrication and wear resistance. Background technique [0002] Hard / hard artificial joints (Co-Cr-Mo / Co-Cr-Mo, Al 2 o 3 / Al 2 o 3 ) has excellent wear resistance and is the development direction of long-life artificial joints. However, due to poor lubrication in the body and poor wettability between metal and body fluid, it is difficult for metal to metal to form hydrodynamic lubrication at low sliding speeds, and the body is often in a mixed lubrication state with a high friction coefficient. Therefore, a large amount of metal wear debris will still be produced during its use, and the metal wear debris will penetrate into the blood, causing soft tissue infection and even systemic poisoning of the patient, seriously affecting its reliability a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/30
CPCA61F2/30771A61F2002/30001
Inventor 熊党生王琨邓亚玲
Owner NANJING UNIV OF SCI & TECH
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