A novel in vivo approach to assess strains of the human abdominal wall under known intraabdominal pressure
2021
The study concerns mechanical behaviour of a living human abdominal wall. A
better mechanical understanding of a human abdominal wall and recognition of
its material properties is required to find mechanically compatible surgical
meshes to significantly improve the treatment of ventral hernias. A non-invasive methodology, based on in vivo optical measurements is proposed
to determine strains of abdominal wall corresponding to a known intraabdominal
pressure. The measurement is performed in the course of a standard procedure of
peritoneal dialysis. A dedicated experimental stand is designed for the
experiment. The photogrammetric technique is employed to recover the
three-dimensional surface geometry of the anterior abdominal wall at the
initial and terminal instants of the dialysis. This corresponds to two
deformation states, before and after filling the abdominal cavity with dialysis
fluid. The study provides information on strain fields of living human abdominal
wall. The inquiry is aimed at principal strains and their directions, observed
at the level from -10% to 17%. The intraabdominal pressure related to the
amount of introduced dialysis fluid measured within the medical procedure
covers the range 11-18.5 cmH$_2$O. The methodology leads to the deformation state of the abdominal wall
according to the corresponding loading conditions. Therefore, the study is a
step towards an identification of mechanical properties of living human
abdominal wall.
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