Biomedical Engineering Reference
In-Depth Information
Fig. 7.7 Comparison of normal stress S
33
along a node path 1 (see Fig.
7.6
) and b node path 2
for system BS with factorized foam material F0.25
Fig. 7.8 Comparison of shear stress S
23
along node path 1 (see Fig.
7.6
) for system BS with
factorized foam material a F0.25 and b F0.5
Table 7.7 Ideal bedding
systems with low tissue stress
(pre-selection)
System
variation
Bedding
system
Foam
material
Membrane
pressure (mbar)
LS1
BS
F0.25
2.8
LS2
BS
F0.5
2.8
LS3
3CS
F0.5
3.0
7.1.3.3 Pre-Selection of Appropriate Bedding System Variations
Based on the simulated mechanical tissue stress in the buttock regions of BoMo 2
and BoMo 4, the three systems LS1-LS3 listed in Table
7.7
were shown to be
superior in minimizing normal stress S
33
and shear stress S
23
in fat and muscle
tissue. Figures
7.9
and
7.10
depict tissue path stress of these system variations.
The final selection of an ideal bedding system was restricted to the three
previously selected systems.
