科研之友
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摘要
A selection of hernia meshes is a compromise between their biocompatibility and mechanical performance. A critical evaluation of prosthetic materials was presented, comparing the elasticity and level of orthotropy of three different brands of hernia meshes and abdominal fascia.
Uniaxial tensile and relaxation tests were performed with human abdominal fascia and hernia meshes. The experiments were performed with velocity of elongation for tensile tests -0.13 mm/s and for relaxation experiments -1.26 mm/s. The investigation of elastic properties included 96 specimens from umbilical and transversalis fascia taken from 16 donors, as well as 30 mesh samples. Relaxation experiments were performed with 17 samples of fascia umbilicalis and other 30 mesh samples. The samples were cut in two orthogonal directions.
The values of elastic modulus E for the investigated hernia meshes were calculated and compared with the elastic modulus of abdominal fascia. The elastic module in longitudinal direction of the investigated meshes was shown to be lower than those of the abdominal fascia in the range of 5 % to 15 % of deformations. The values of E for meshes are in the range of 3.9 MPa to 8.16 MPa, while elastic modulus for fascia is up to 10.7 MPa. In the transverse direction, however, the values of elastic modulus for meshes are up to 3 times higher than the corresponding values for fascia.
The level of orthotropy of the tested materials was investigated using stress ratio of Lagrangian stress calculated for the transversal and longitudinal direction. It was obtained that the stress ratio at tensile tests is between 0.8-1.91 for hernia meshes and 0.23-0.35 for fascia while the level of orthotropy of testing materials during relaxation experiment at t = 0 s, 600 s and 1000 s is in the range 1.41-2.86 for hernia meshes and 0.355 for fascia.
- 出版日期2012-10
