Ординатура / Хирургия / Библиотека им академика М.И. Перельмана / Книга_888_Библиотеки_им_академика_М_И_Перельмана

testing is performed by passing a suture surrogate, typically a stainless steel wire, through the material 1cm from the edge and applying tension to the material until failure occurs. Suture retention strength is dened as the maximum load sustained prior to failure [7, 8]. Tear resistance testing is typically performed in an effort to understand the resistance that a material provides against the propagation of a tear once a tear has been initiated. To accomplish this, a small tear of a dened length (typically 2.54cm long) is created in the mesh, leaving two tabs on either side of the tear. Tension is applied to the tabs, and the force required to fully propagate the tear across the mesh is recorded as the tear resistance strength [7, 8]. Ball burst testing is another common method of material characterization. In ball burst testing, the mesh is clamped in a test xture, and a stainless steel ball is applied against the mesh in compression until failure occurs and the ball bursts through the mesh [7, 8]. Uniaxial tensile testing is accomplished by subjecting a strip of mesh to tension in a single direction, while planar biaxial tensile testing applies tension in two, orthogonal directions [7, 8, 14]. Material properties such as ultimate tensile strength, stiffness, and strain can be calculated from ball burst testing. In addition to these properties, tensile testing can also quantify anisotropy (i.e., direction dependence of the mechanical response). Planar biaxial testing realistically simulates the conditions of the human abdomen and provides additional insight into properties such as nonlin­earity and hysteresis, providing a signicant advantage over other methods of testing.