Journal: Journal of the mechanical behavior of biomedical materials

Article Title: Indentation of a pressurized silicon stomach model - A non-invasive study of gastric wall stiffness and pressurized gastric content stiffness.

doi: 10.1016/j.jmbbm.2022.105449

Figure Lengend Snippet: Fig. 1. Silicon stomach model and the test set up. A: The silicon stomach model 1:1 ratio with the human stomach. Four lines perpendicular to the middle line were used to distinguish the proximal (P), middle-1 (M1), middle-2 (M2), and distal (D) locations of the stomach model. The intersection points of the perpendicular and middle lines were the indentation loading points, and the perpendicular lines were the scan paths (the red arrow) of the ultrasonic probe in each stomach section. B: The indentation test and the stomach model inflation system, including the stomach model, a pressure algometer to conduct indentation force and two manipulators. One manipulator was used to control the indentation displacement by moving the algometer perpendicularly, and the other was used to control the intragastric pressure by adjusting the water level in the water container. C: A representative ultrasound image taken at pressure zero at the proximal location. The luminal cross- sectional area was identified semi-automatically for calculations of the inner radius. The wall thickness was obtained by averaging the five wall thickness mea surements (the purple color line).

Article Snippet: The algometer was fixed on a retort stand with a ring clamp and a manipulator (ADInstruments, Oxford, UK).

Techniques: Control