Computer-Simulated Model Examining the Effects of Convexity Characteristics at the Skin Barrier- Abdomen Interface

The aim of this study was to use computer simulations to generate quantitative insights as to how the characteristics of convex skin barriers might contribute to stomal protrusion or leveling of the peristomal skin when applied to 3 different types of abdomens varying in thickness and tone of the subcutaneous fat.

Finite element analysis (FEA) was used to model the interactions of convex skin barriers with 3 different types of abdomens. The skin barriers' depth, slope, tension location, and compressibility were systematically varied, and the model was used to simulate how each combination deformed the peristomal tissue when applied. The results were analyzed using factorial regression analysis to reveal which characteristics of convexity contribute most to generating central and peripheral tension. The influence of flexibility was not measured as our simulation did not capture the bending motion required to flex the skin barrier.

Depth and tension location were identified as the most influential factors in promoting central tension, whereas slope and depth most influenced peripheral tension. These findings further our understanding of the 5 main characteristics of convexity and may assist with appropriate selection of convex skin barriers for a person living with an ostomy.