Biomedical Engineering Reference
In-Depth Information
Fig. 7.18
Particularities of the mesh structure for ICU: (
a
) mesh size 1 mm for the bone plate 4
and 2 mm for the vertebra 5; (
b
) mesh size transition in vertebral bone: large mesh 1, transition
elements 2, and fine mesh 3; (
c
) overall mesh structure of the ICU
Table 7.3
Loading conditions for ICU, in flexion movement
F
1
—A spot
(N)
F
2
—B spot
(N)
F
3
—C spot
(N)
M
f
—D spot
(Nm)
F
4
—E spot
(N)
F
5
—F spot
(N)
Loading type
Value
30
40
40
2.5
6.8
6.8
was applied on the C2 vertebral body having the direction of forward rotation, and
representing the average action of the deep cervical flexors [
43
] . Kurtz [
34
] esti-
mated the individual values of these shear forces
F
2
and
F
3
to 50 N. But, taking into
account the bending moment applied on the C2 vertebra, the
F
2
and
F
3
forces were
reduced to 40 N each.
The distribution of the forces and moment on the ICU structure can be observed
in Fig.
7.19
, together with the fixing conditions. The fixed surfaces are considered
the bottom joint faces of the C3 vertebra. Without minimum one fixed support, the
analysis cannot be completed.
In addition to the parameters mentioned before, the simulation environment
requires some evaluation parameters like stress, strain, or deformation.
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