14.07.2021 | History

4 edition of Oxidation of ultra high molecular weight polyethylene (UHMWPE) containing traces of cobaltion found in the catalog.

Oxidation of ultra high molecular weight polyethylene (UHMWPE) containing traces of cobaltion

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      • Thesis (M.A.Sc.) -- University of Toronto, 2000.

        StatementNational Library of Canada
        PublishersNational Library of Canada
        Classifications
        LC Classifications2000
        The Physical Object
        Paginationxvi, 76 p. :
        Number of Pages52
        ID Numbers
        ISBN 100612533492
        Series
        1
        2Canadian theses = -- Thèses canadiennes
        3

        nodata File Size: 1MB.


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Oxidation of ultra high molecular weight polyethylene (UHMWPE) containing traces of cobaltion by National Library of Canada Download PDF EPUB FB2


Thus, diffusion-mediated oxygen transport is a primary mechanism of cell nutrition in the spinal disc, and disruption of nutrient supply is hypothesized to contribute to disc degeneration. It also summarizes the test methods that are commonly used to evaluate implants for in vivo oxidation.

Oxidation of ultra high molecular weight polyethylene (UHMWPE) part 1: Interpretation of the chemiluminescence curve recorded during thermal oxidation

or its licensors or contributors. In a healthy avascular disc, the concentrations of oxygen and other biomolecules in the annulus and nucleus are governed by diffusion from vertebral body capillaries that infiltrate the endplate-disc interface.

The CL curve of PE normally exhibits a double sigmoidal behaviour, whereas PP shows a single sigmoid, and its luminescence intensity is also much lower. The chemiluminescence curve of polyethylene differs from that of polypropylene even though the oxidation behaviour is similar. The aqueous in vivo environment for UHMWPE components is in many ways more complex than the gaseous environment to which they are exposed during manufacture, sterilization, and shelf aging.

The synovial fluid of patients with arthritis is also known to contain dissolved oxygen and other gases, which originate from filtered plasma.

By continuing you agree to the. From these observations it is concluded that the CL from PE is a type of activated chemiluminescence, which originates from hydroperoxide decomposition, with carbonyls acting as activator. The in vivo environment of artificial discs is less well understood than hip and knee replacements. The intensity of the first peak is enhanced by doping the PE with DPA 9,10-diphenylanthracenewhich is a chemiluminescence activator, but unaffected by doping the PE with DBA 9,10-dibromoanthracenewhich is an energy acceptor.

Oxidation of ultra high molecular weight polyethylene (UHMWPE) containing traces of cobaltion (2000 edition)

Ultra-high molecular weight polyethylene UHMWPE components are bathed in body fluids containing potential free radical initiators, as well as molecular oxygen fuel, for in vivo oxidation. The intensity of the first peak also depends on the presence of carbonyls in the sample.

However, spinal disc tissue changes with degeneration, with a tendency toward increased enervation and vascularization, which will in turn increase oxygen transport. It was found, by investigating the build-up of carbonyls and hydroperoxides by means of FTIR, that the first peak coincides with a maximum in hydroperoxide concentration and the second with the build-up of carbonyls.

This chapter provides an overview of the natural history of in vivo degradation in historical and contemporary polyethylene components for hip, knee, and spinal implants.