The functional appraisal of the biological materials compoundly tanned for prothetic valve
- VernacularTitle:复合鞣制方法处理生物瓣膜生物材料性能评估
- Author:
Xuemei WANG
;
Li XU
;
Chunxiang WANG
- Publication Type:Journal Article
- Keywords:
Heart valve prosthesis Bioprosthesis Tanning
- From:Chinese Journal of Thoracic and Cardiovascular Surgery
1995;0(05):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To evaluate biological materials tanned with a compound method for clinical performance of biovalves. Methods: The tissue calcium concentration was compared between biological materials tanned simply with amylic aldehyde and those compoundly tanned with amylic aldehyde, cation fat, chromium trioxide and glycerol. The histological morphology, the ultra-structure and tensile strength of the biological materials were tested and the content of hydroxyls in the materials was measured with the Fourier infrared spectrum detector. The prosthetic biological cardiac valves made of the materials were tested with an accelerated wearing device extracorporeally. Results: The tissue calcium concentration was lower in the compoundly tanned materials. In these materials, the collagenous fibers were dense and lined up in order. The cellular structure was maintained. The materials were pliable at the contracting temperature of 86℃ to 90℃. The tensile strength of the materials was 19.9 to 25.9 N/mm 2 and the extension rate was 43.4% to 46.0%. The peak of the hydroxyls decreased significantly at the wave length of 1741.11 cm -1 in the Fourier infrared spectrum. The swine aortic valve experienced 3.892?10 8 cycles in the accelerated wearing tests, and the bovine pericardial valve, 3.888?10 8 cycles. By estimation, the biovalves will last for about ten years. Conclusion: Compound tanning can increase firmness and softness of the materials and may play an important role in anticalcification of the biovalves.
