Abstract
Objective: A finite element model of the lower back was created to evaluate the mechanical properties of two types of pressure-distributing mattresses in the lateral position for pressure injury prevention（include deep tissue injury）mattress. Methods: A finite element model of the human lower back and two types of pressure-distributing mattresses was created, and a simulation evaluation was performed in the lateral position considering the pressure redistribution functions. The validity of the model was evaluated by comparing it with actual measurements. The contact pressure and deformation between the body and the air mattress obtained from the analysis were generally consistent with the actual measurements, and the analytical model and its analytical method were effective for evaluating mattresses. These results suggest that the shape and deformability of the mattress have little effect on the risk of pressure ulcers occurring inside the body. The analysis taking into account the pressure redistribution functions confirmed that pressure redistribution is also effective in reducing stress inside the body.
