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Borgognoni,Camila Figueiredo; Tattini Junior,Virgilio; Ayrosa,Ana Maria Irene Bartolomeu; Polakiewicz,Bronislaw; Leirner,Adolfo Alberto; Maizato,Marina Junko Shiotsu; Higa,Olga Zazuco; Beppu,Marisa Masumi; Pitombo,Ronaldo Nogueira de Moraes. |
The bovine pericardium has been used as biomaterial in developing bioprostheses. Freeze-drying is a drying process that could be used for heart valve's preservation. The maintenance of the characteristics of the biomaterial is important for a good heart valve performance. This paper describes the initial step in the development of a bovine pericardium tissue freeze-drying to be used in heart valves. Freeze-drying involves three steps: freezing, primary drying and secondary drying. The freezing step influences the ice crystal size and, consequently, the primary and secondary drying stages. The aim of this work was to investigate the influence of freezing rates on the bovine pericardium tissue freeze-drying parameters. The glass transition temperature and... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Freeze-drying; Freezing; Bovine pericardium. |
Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000600021 |
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Lara,R.C.; Lucon,A.M.; Arap,S.. |
The use of bovine pericardium as a urethral patch to substitute a ventral segment of canine urethras was studied. Healing, epithelial growth, urethral permeability, fistulas, and calcification were analyzed. Thirty male mongrel dogs of medium and large size underwent resection of a ventral segment of the medial urethra measuring 2.0 x 0.5 cm, which was replaced with a bovine pericardium graft, treated with buffered glutaraldehyde and preserved in formaldehyde. Two running sutures of polygalactin 5-0 were applied, one on each side of the patch. The corpus spongiosum was closed with uninterrupted suture and the skin with interrupted suture of polygalactin 5-0. Six months later, the animals were examined and sacrificed under anesthesia. Retrograde... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Urethra; Urethral stricture; Bovine pericardium. |
Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000300006 |
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