Kazuya Nakayama

Tokyo Medical and Dental University, Edo, Tōkyō, Japan

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Publications (2)3.21 Total impact

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    ABSTRACT: Nerve conduit tubes were developed using bioabsorbable polymer membranes, and the effects of tube shape--straight or bellows-shaped tubes--and the fibrin gel filling were investigated. The mechanical properties of the tubes were examined by in vitro tests, and their effectiveness for peripheral nerve regeneration was determined by grafting into experimentally transected sciatic nerves of rats. The bellows tube showed mechanically superior properties, and when used with the fibrin gel, it induced superior tissue formation of myelinated nerve fibers as compared to other tube types. The total area of myelinated axons regenerated in the fibrin-filled bellows tube was comparable to that of an isograft control, whereas those of the other tubes demonstrated inferior regeneration. This result suggests that the mechanically superior bellows tube filled with fibrin gel is an effective graft alternative for peripheral nerve regeneration.
    Artificial Organs 08/2007; 31(7):500-8. DOI:10.1111/j.1525-1594.2007.00418.x · 1.87 Impact Factor
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    ABSTRACT: We developed two types of nerve conduits, straight tubes, and bellows tubes, for peripheral nerve regeneration with bioabsorbable polymer membranes. Mechanical properties of these straight and bellows tubes were analyzed. 30 straight tubes and 30 bellows tubes were implanted to a nerve defect made in a rat sciatic nerve and the nerve regeneration in the tube was investigated. A half of these tubes were utilized alone and the others were filled with fibrin gel made from coagulated plasma and implanted. Bellows tubes were superior in mechanical characteristics to straight tubes and the inner cavities of the bellows tubes were suitably maintained after implantation. At 4 weeks after operations, remyelinations were observed in the regenerated tissue at the location of the middle parts of the tubes filled with fibrin gel whereas no remyelinations in the tubes without fibrin gel. The use of fibrin gel as filling materials within the tubes significantly enhanced the nerve regeneration. The fibrin gel might be soft nanomaterials significantly enhance the regeneration of the peripheral nerves. We concluded that the developed bioabsorbable bellows tubes filled with fibrin gel were effective for peripheral nerve regeneration.
    Journal of Nanoscience and Nanotechnology 04/2007; 7(3):730-3. DOI:10.1166/jnn.2007.519 · 1.34 Impact Factor