H F Lichti

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Allogeneic and xenogeneic biological tendon and ligament materials for ligament replacement were tested in the knee of rabbits and sheep. In-vitro and ex-vivo biomechanical tests as well as micromorphological investigations following implantation were performed. The preparation procedure mainly consists in cross linking of collagen by dicarboxylic acids(More)
A new bovine collagenic prosthesis (Solcograft P) was tested in animal experiments. In 45 dogs the infrarenal abdominal aorta was substituted. During a follow-up period of up to 18 months the functional rate amounted to 88 %. Joint-crossing iliaco-femoral bypasses were implanted in 31 dogs, 5 times in both sides. For the new bovine collagenic graft the(More)
Flexible sigmoidoscopy (FS) is a feasible examination technique and a suitable tool for population-based screening, but very little is known about determinants of endoscopic screening participation. The aim of this study was to determine the acceptance rate and the factors influencing the decision of participating in a screening program for patients in an(More)
The destruction of small lesions by tissue denaturation (fixation) rather than erosion (acid hydrolysis) is accomplished by nitric acid of moderate strength in which nitric acid reduction products are generated by nitric acid oxidation of added organic acids. Such solutions show a temperature-dependent increase or loss of nitrite during storage, with loss(More)
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(More)
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(More)