Energia total de ruptura: um teste biomecânico para avaliação de material biológico com propriedade viscoelástica não linear

Abstract

Objetivo: Apresentação do teste biomecânico Energia Total de Ruptura para o estudo da resistência intrínseca de material biológico com propriedade viscoelástica não-linear representado neste trabalho por segmento íntegro de cólon descendente de rato. Métodos: Implementação do teste biomecânico Energia Total de Ruptura e do Sistema de Aquisição e Análise de dados Biomecânicos - SABI 2.0. Para esse fim, foram utilizados conceitos físico-mecânicos, computacionais e biomecânicos e como corpos de teste, 15 espécimes de cólon descendente de ratos. Resultados: O teste biomecânico Energia Total de Ruptura permitiu o cálculo da energia total acumulada necessária para promover a ruptura dos corpos de prova durante os ensaios mecânicos. Por meio da automatização e gerenciamento da aquisição e análise dos dados capturados foi possível a geração de gráficos e relatórios descritivos e estatísticos. Conclusão: Fundamentado em conceitos físico-mecânicos, computacionais e biomecânicos, o teste Energia Total de Ruptura pôde proporcionar análise matemática do comportamento dos segmentos de cólon descendente de ratos durante os ensaios, demonstrando ser um possível método de medição da resistência intrínseca desse material biológico com propriedade viscoelástica não-linear.

Hyperbaric oxygen therapy and mechanical resistence of the colonics anastomosis in rats with peritonitis

“…In this research, Total Energy Rupture (ETR) biomechanical test was elected in order to check anastomoses quality, as described by Wu et al 33 . Control Group presented an average ETR of 196,26 gf.cm, statistically different from Peritonitis Group, showing that the peritonitis model acted deleteriously in anastomosis cicatrization weakening their mechanical resistance.…”

“…After 30 minutes, these segments were taken out of solution and were submitted to the Total Energy of Rupture biomechanical test (ETR). ETR test was performed following the protocol described by WU et al 33 . The force generated by the traction system was transferred to the specimen and detected by the precision balance strength cell.…”

Comparative study of descendent colon rupture resistance considering traction force of rupture and total energy of rupture in rats

“…FRT and ETR values for each rat as well as average, standard deviation, standard error of the average and the variation coefficient from these physical largeness are presented at Table 1. ETR test was performed following the protocol described by WU et al 8 . The force generated by the traction system was transferred to the specimen and detected by the precision balance strength cell.…”

“…Due to this fact, researchers have developed and applied different experimental models based on distinct physical-mechanical concepts with the aim to evaluate the intrinsic resistance of the intestinal wall when it is submitted to some kind of physical largeness [1][2][3][4][5][6][7][8][9][10][11] . , analyze partially the intestinal wall resistance properties, as these biological materials present non-linear viscoelastic properties.…”

“…With the aim of including these attributes into the analysis, it was developed the Total Energy of Rupture test (ETR) based on the Universal Principle of Energy Conservation. This biomechanical test permits the mathematical analysis of the inherent properties of the intestinal segments after their submission to a variable force with the time 8 . In this work a comparative study between the physical largeness of Traction of Rupture, which presents uniaxial characteristic, and Total Energy of Rupture is proposed.…”