Biomedical Engineering Reference
In-Depth Information
Fig. 7.11 Interaction of BoMo 4 with system LS1 (top) and system LS3 (bottom). Red circles
indicate regions of possible material failure
Fig. 7.12 Comparison of normal stress component S 33 along a node path 1 and b node path 2
(see Fig. 7.6 ) for system LS2, TV and the foam mattress
7.1.4 Ideal Bedding System
7.1.4.1 Correlation Between Membrane Pressure and Body Weight
Since increasing membrane pressure results in increasing tissue stress, adjustment
between body weight and membrane pressure is required. To effectively compare
tissue-support interaction, the definition of a deformation condition is necessary.
Such a condition is comprised from the minimum distance between the upper and
lower membrane surfaces and maintaining this distance constant during interac-
tion, cf. Fig. 7.14 a. These restrictions lead to a relation of membrane pressure and
body mass as shown in Fig. 7.14 b.
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