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  • 1
    Electronic Resource
    Electronic Resource
    Viscoelastic properties modulation of a novel autocrosslinked hyaluronic acid polymer (1996)
    Springer
    Journal of materials science 7 (1996), S. 695-698 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Autocrosslinked polysaccharide (ACP) polymers are inter- and intra-molecular esters of hyaluronan (HA) in which part of the carboxyl group is esterified with hydroxyl groups of the same and/or different molecules of the polysaccharides. Suspensions of ACPs in bidistilied water, with relative levels of crosslinking varying from 5% to 20% and different weight concentrations, were obtained to analyse their viscoelastic properties. The steady shear tests showed the pseudoplastic behaviour of ACP, viscosity having a higher value at higher concentrations and degrees of crosslinking. The viscoelastic properties showed an essentially elastic behaviour in the examined frequency range, and they can be modulated by varying both the degree of crosslinking and the weight concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00123409
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The rheological behaviour of animal vitreus and its comparison with vitreal substitutes (1994)
    Springer
    Journal of materials science 5 (1994), S. 743-747 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Some important eye pathologies, such as diabetic proliferative retinopathy and retinal detachment, are strictly connected to different gel vitreus alterations. Therefore there is a strong need in ophthalmology for vitreal substitutes. Until now many synthetic and natural polymers have been tested as vitreal substitutes, but no one has proved to be an ideal vitreal substitute. An ideal vitreal substitute, apart from other characteristics, such as transparency, permanency, biocompatibility, etc. must have a rheological behaviour compatible with the surrounding tissues. The viscoelastic behaviour of different animals' gel vitreus, evaluated by means of steady shear viscosity and small-amplitude oscillatory measurements, is typical of solid-like rubbery gels with dynamic elastic modulus G′ higher than the dynamic viscous modulus G″ in the typical frequency range investigated (0.05–10 Hz). On the other hand the rheological behaviour of current or candidate vitreal substitutes (silicone oil, HPMC, high molecular weight hyaluronic acid and chemically-crosslinked hyaluronic acid), analysed with the same technique, is generally different from that of natural vitreus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120368
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  • 3
    Electronic Resource
    Electronic Resource
    Viscoelastic evaluation of different knee osteoarthritis therapies (1995)
    Springer
    Journal of materials science 6 (1995), S. 130-137 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: This study deals with the viscoelastic evaluation of the efficacy of two ordinary knee osteoarthritis therapies: injections of exogenous high molecular weight hyaluronic acid and arthrocentesis. The results were also compared with “placebo” treatment. Synovial fluids were extracted from osteoarthritic knee joints of 60 patients before and after the different treatments and were analysed in a rheometer with coaxial cylinders arrangement at 37°C. Frequency sweep experiments provided the values of shear storage modulus G′ and shear loss modulus G″ as function of oscillation frequency. The quantified viscoelasticity gave information about the mechanical performance of synovial fluids and hence the long-term efficacy of osteoarthritis therapies. Moreover, the results were interpreted in terms of macromolecular structure and hyaluronic acid concentration and molecular weight in pathological synovial fluids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120288
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