Mapování tloušťky mazacího filmu v náhradách kyčelního kloubu

Mapping of lubricating film thickness in human hip joint replacements

conference paper

en

This paper describes experimental mapping of lubricating film thickness and mechanism of its forming in contact of CoCrMo femoral head with a diameter of 28 mm and a glass disc with presence of bovine serum as a substitute of synovial fluid occurred in a natural joint. The contact area was illuminated by a xenon lamp and recorded by a high-speed camera. The load applied to the contact area was 5 N corresponding with the contact pressure of 271 MPa. Obtained data was evaluated by a thin film colorimetric interferometry. A pure rolling and partial sliding measurements were examined. From observed interferograms is apparent the deposition of proteins to the glass disc and femoral head surfaces, denaturation and formation of protein aggregations affecting the residual lubricating film thickness. The basic mechanisms of protein film forming were brought out and it is apparent that forming of protein lubricating film is a complex mechanism containing more influences.

Tento článek se zabývá mapováním tloušťky mazacího filmu v umělých náhradách kyčelního kloubu pomocí experimentální metody založené na kolorimetrické interferometrii velmi tenkých mazacích filmů.

This paper describes experimental mapping of lubricating film thickness and mechanism of its forming in contact of CoCrMo femoral head with a diameter of 28 mm and a glass disc with presence of bovine serum as a substitute of synovial fluid occurred in a natural joint. The contact area was illuminated by a xenon lamp and recorded by a high-speed camera. The load applied to the contact area was 5 N corresponding with the contact pressure of 271 MPa. Obtained data was evaluated by a thin film colorimetric interferometry. A pure rolling and partial sliding measurements were examined. From observed interferograms is apparent the deposition of proteins to the glass disc and femoral head surfaces, denaturation and formation of protein aggregations affecting the residual lubricating film thickness. The basic mechanisms of protein film forming were brought out and it is apparent that forming of protein lubricating film is a complex mechanism containing more influences.

Biotribologie, Hovězí sérum, Tloušťka filmu, Umělý kyčelní kloub, Kolorimetrická interferometrie

Biotribology, Bovine serum, Film thickness, Artificial hip joint, Colorimetric interferometry

2012

12.09.2012

Brno University of Technology

Brno

978-80-214-4533-8

53rd International Conference of Machine Design Departments

1

45–52

8