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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 243 (1986), S. 215-223 
    ISSN: 1434-4726
    Keywords: Tracheal prosthesis ; Transplantation ; Bioprosthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We removed the tracheas from sacrificed laboratory animals and subjected this tissue to multistep chemical processing. This method allowed us to preserve the cartilage and reduce its antigenicity, thus creating a bioprosthesis very similar to the host tissue. By using allogeneic and xenogeneic prostheses so prepared, no signs of immune rejections were seen following heterotopic or orthotopic implantations. The transplanted cartilage remained stable for periods ranging up to 21 weeks in recipient rats, while partial morphologic integrity of the cartilage was seen up to 1 year in pigs. Reepithelialization of the transplant with ciliated epithelium was completed in all specimens 12–24 weeks following surgery. Segmental replacement of up to one third of the whole trachea was possible in rats, whereas similar segmental replacements failed in pigs. We also found that successful reconstruction of window-shaped defects was possible. We consider our tracheal bioprosthesis to be superior to cialit-preserved grafts and also to most other biological reconstruction procedures.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-2451
    Keywords: Vascular prosthesis ; Microvascular surgery ; Bovine xenograft ; Gefäßprothesen ; Mikrogefäßchirurgie ; Bovines Xenograft
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In einer tierexperimentellen Studie wurde die Anwendbarkeit der neuen xenogenen bovinen kollagenen Gefäßprothese (Solcograft-P ®) als kleinkalibriger GefaBersatz (ø 〈 2 mm) untersucht. Beobachtungsdauer: 9 (n= 13), 12 (n=7) Monate. Untersuchungsmethoden: Angiographie, Histomorphologie, Rasterelektronenmikroskop. Die Durchgangigkeitsrate im untersuchten Kaliberbereich betrug insgesamt 95%. Das Prothesenkollagen wurde unter Neubildung von kollagenem und elastischem Bindegewebe teilweise abgebaut. Eine überschießende Neointimabildung war nicht zu beobachten. Die lumenseitige Auskleidung der Prothese erfolgte durch eine homogene endothelartige Zellschicht. In 30% der Fälle traten Verkalkungen bzw. Verknöcherungen auf. In einem Fall war eine aneurysmatische Dilatation in Prothesenmitte zu beobachten. Vor einer klinischen Anwendung sollte die biomechanische Belastbarkeit unter hypertensiven Kreislaufbedingungen überprüft werden.
    Notes: Summary In an animal model, we investigated the applicability of a new bovine vessel xenograft (Solcograft-P) as a small vascular substitute (ø 〈 2 mm). The observation intervals were 9 (n=13) and 12 (n=7) months. Examination methods included: angiography, light microscopy, and scanning electronic microscopy. The small-diameter xenografts examined had an overall patency rate of 95%. The prosthesis collagen was progressively substituted by newly formed collagenous and elastic connective tissue. Neointimal hyperplasia did not occur. The lumen-side surface was formed by an endotheliumlike cell layer. In 6 of 20 cases calcification and ossification were observed. In 1 case we saw an aneurysmal dilatation in the middle of the prosthesis. Before clinical application, the biomechanical properties should be examined under hypertensive circulation conditions.
    Type of Medium: Electronic Resource
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