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The device used for the abdominal wall tension (AWT) measurements. This instrument can measure the required thrust to produce displacement (mm). A: thrust meter; B: self-made device; D: oval head. Vertical pressure during the measurement drives the device to the abdominal wall and stops when C is touched by the abdominal wall. X is the vertical displacement of the abdominal wall sag. The thrust is recorded by A. AWT is defined as thrust/displacement (N/mm).
