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Deformation of skull bone
as intracranial pressure changing
Xianfang Yue* and Li Wang
School
of Mechanical Engineering, University of Science and
Technology Beijing, Beijing 100083, China.
*Corresponding author. E-mail:
yuexf@me.ustb.edu.cn.
Tel: +86-01-62332743. Fax: +86-10-62329145.
Accepted
31 March, 2008 |
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Raised intracranial pressure (ICP), a serious and often fatal
condition, is often not preventable. In the present study,
the relationship was determined between cranial deformation
and ICP change. To record the deformation of skull bone,
strain foil was placed on the exterior surface of parietal
skull. Prior to construction of finite-element model (FEM),
using the rats, an in vivo study was undertaken.
Three anesthetized adult rats were subjected to baseline
recording followed by either experimental raising ICP. By
using the ‘Ansys’ finite element processor, a
three-dimensional FEM of a hollow sphere was constructed for
human skull. The model was used to calculate the deformation
of human skull with the intracranial pressure changing. The
skull is a layered sphere constructed in a specially
designed form with a Tabula externa, Tabula interna, and a
porous Diploe sandwiched in between. The stress and strain
deformations were well-proportional on the exterior surface
of human skull. The deformation scope of human skull was
theoretically from 1.0 to 3.4 με with the changing ICP from
1.5 to 5.0 kPa. The cranium could move and human skull -
dura mater system was deformed as the ICP fluctuates.
Key
words:
Deformation, skull bone, intracranial pressure,
finite-element model, rat. |
