Biomedical Engineering Reference
In-Depth Information
Fig. 7.20 Tissue shear stress
S
23
along node path 4 (see
Fig.
7.18
): a all investigated
bedding systems and
b systems with lowest tissue
stress
7.1.6.2 Membrane Material (Air Mattress)
Numerical analysis has shown that changing the mattress height from 55 mm
(as used in the simulations previously described) to 100 mm has no effect on tissue
stress distribution. A commercially available mattress type with 100 mm height
can thus be used for prototyping.
7.1.6.3 Final Prototype Design
To properly house electrical instrumentation and pump equipment for membrane
air pressure generation, some T-bars including guides were moved 63 mm towards
the head side, cf. Fig.
7.23
. Furthermore, the mattress support was modified to
allow for simple assembly of a prismatic soft foam mattress with the dimensions:
L 9 W 9 H = 2,000 9 900 9 100 mm.
