Modeling of the Generation of UHMWPE Particles With Microfabricated Surface Textures

World Tribology Congress III, Volume 2 ◽

10.1115/wtc2005-63495 ◽

2005 ◽

Author(s):

Hsu-Wei Fang ◽

Stephen M. Hsu ◽

Jan V. Sengers

Keyword(s):

Particle Size ◽

Surface Texture ◽

Wear Particles ◽

Surface Textures ◽

Uhmwpe Wear ◽

Joint Implants ◽

Uhmwpe Wear Particles ◽

Particle Size And Shape ◽

Ultimate Purpose ◽

Texture Design

Microfabricated surface textures have been utilized to generate narrowly distributed UHMWPE wear particles with different sizes and shapes. The ultimate purpose of the research is to study bioactivity effects induced by UHMWPE particles that lead to the failure of total joint implants. Previously we developed a method of surface-texture design to control the particle size and shape [1]. The objective of the present paper is to model the generation UHMWPE particles with surface textures containing wedge-shaped cutting edges.

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Effects of Biological Lubrication on the Morphology of UHMWPE Wear Particles Generated With Surface Textures

World Tribology Congress III, Volume 2 ◽

10.1115/wtc2005-63501 ◽

2005 ◽

Author(s):

Hsu-Wei Fang ◽

Yu-Chih Su

Keyword(s):

Wear Particles ◽

Textured Surfaces ◽

Surface Textures ◽

Total Joint Replacements ◽

Size And Shape ◽

Immunological Responses ◽

Uhmwpe Wear ◽

Uhmwpe Wear Particles ◽

Particle Size And Shape ◽

Uhmwpe Particle

Osteolysis induced by ultra-high molecular weight polyethylene (UHMWPE) wear particles has emerged as a critical failure mechanism of artificial joints. Many researchers have performed cell culture studies or animal tests to investigate the UHMWPE particles induced immunological responses. However, the effect of size and shape remains elusive. This is partly because of the difficulty in obtaining UHMWPE wear particles with specific sizes and shapes for bioactivity tests. Previously, we have shown the feasibility of producing narrowly distributed UHMWPE particle sizes and shapes by rubbing UHMWPE pins against textured surfaces [1]. The correlations between the surface texture dimensions and the size and shape of wear particles generated in water have been obtained [2]. In addition, this novel technique of UHMWPE particle generation enables the investigation of the effects of UHMWPE particle size and shape on bioactivity. It is concluded that the elongated particles and the particles which can be engulfed by macrophage cells induced stronger immunological responses [3]. Thus, it is possible to enhance the life of total joint replacements by reducing the production of the most toxic particle populations in terms of size and shape. Our idea is to apply surface textures on the articulating surface of joint implant in order to control the size and shape of UHMWPE wear particles. While maintaining a low wear rate of UHMWPE parts, further reduction of the most “toxic” particles released into human body shall prevent particle-induced osteolysis.

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Surface Texture Design to Generate Specific Sizes and Shapes of UHMWPE Wear Particles

Materialwissenschaft und Werkstofftechnik ◽

10.1002/mawe.200300683 ◽

2003 ◽

Vol 34 (1011) ◽

pp. 976-988 ◽

Cited By ~ 15

Author(s):

H. W. Fang ◽

S. M. Hsu ◽

J. V. Sengers

Keyword(s):

Surface Texture ◽

Wear Particles ◽

Uhmwpe Wear ◽

Uhmwpe Wear Particles ◽

Texture Design

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Influence of biological lubricant on the morphology of UHMWPE wear particles generated with microfabricated surface textures

Materials Chemistry and Physics ◽

10.1016/j.matchemphys.2005.06.020 ◽

2006 ◽

Vol 95 (2-3) ◽

pp. 280-288 ◽

Cited By ~ 24

Author(s):

Hsu-Wei Fang ◽

Yu-Chih Su ◽

Chun-Hsiung Huang ◽

Charng-Bin Yang

Keyword(s):

Wear Particles ◽

Surface Textures ◽

Uhmwpe Wear ◽

Uhmwpe Wear Particles

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A Means of Generating Polyethylene Wear Particles With Desired Size and Shape for Biological Studies of Osteolysis

Volume 1 ◽

10.1115/esda2004-58240 ◽

2004 ◽

Author(s):

Mohsen Mosleh ◽

Vijay T. John

Keyword(s):

Wear Debris ◽

Cutting Edge ◽

Biological Study ◽

Wear Particles ◽

Textured Surfaces ◽

Surface Textures ◽

Size And Shape ◽

Uhmwpe Wear ◽

Biological Studies ◽

Uhmwpe Wear Particles

Metallic and ceramic counterfaces with artificial surface textures were rubbed against ultra high molecular weight polyethylene (UHMWPE) pins in water-lubricated wear tests and the characteristics of wear debris were studied. Two types of surface textures were utilized. In the first type, an array of wedge shaped features was created on silicon wafers by microfabrication. It was found that the mean size of UHMWPE wear particles strongly depended on the length of the cutting edge of the wedge. For instance, for wedges with a cutting edge length of 55 μm, 15 μm, and 7 μm, it was found that more than 75% of wear particles had a mean length of 30–60 μm, 6–15 μm, and 4–10 μm, respectively. In the second type of textured surfaces, unidirectional patterns were created on the stainless steel discs. These unidirectional patterns consisted of long, parallel edges and grooves and were created by abrading the discs by different grits of sand papers. The length of the majority of unidirectional edges was found to be approximately equal to the dominant size of elongated wear debris. The narrowly distributed wear debris produced in this investigation can be used in the biological study of the effects of size and shape of UHMWPE wear particles in total joint replacements on osteolysis.

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Brake Wear Particle Size and Shape Analysis of Non-Asbestos Organic (NAO) and Semi Metallic Brake Pad

Jurnal Teknologi ◽

10.11113/jt.v71.3731 ◽

2014 ◽

Vol 71 (2) ◽

Author(s):

Hussain, S. ◽

M.K Abdul Hamid ◽

A.R Mat Lazim ◽

A.R. Abu Bakar

Keyword(s):

Particle Size ◽

Wear Particle ◽

Brake Disc ◽

Wear Particles ◽

Brake Pad ◽

Brake Pads ◽

Size And Shape ◽

Brake Wear Particles ◽

Brake Wear ◽

Particle Size And Shape

Brake wear particles resulting from friction between the brake pad and disc are common in brake system. In this work brake wear particles were analyzed based on the size and shape to investigate the effects of speed and load applied to the generation of brake wear particles. Scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDX) was used to identify the size, shape and element compositions of these particles. Two types of brake pads were studied which are non-asbestos organic and semi metallic brake pads. Results showed that the size and shape of the particles generatedvary significantly depending on the applied brake load, and less significantly on brake disc speed. The wear particle becomes bigger with increasing applied brake pressure. The wear particle size varies from 300 nm to 600 µm, and contained elements such as carbon, oxygen, magnesium, aluminum, sulfur and iron.

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