Design and Mechanical study of PEEK Cage
Date Issued
2006
Date
2006
Author(s)
Chou, Shao-Tsun
DOI
zh-TW
Abstract
In order to avoid the unexpected problems in using a pair of cages in bone fusion, the geometric shapes of cages were designed that they can be used alone as the implant in the operation of intervertebral disc. In account to the convenient consideration in operation, two types of cages were designed, namely, small bearing area and big bearing area in the condtions that: (1) the cage with small bearing area had two holes for implanting graft and applied to posterior spinal fusion; (2) the cage with big bearing area had three holes for implanting graft and applied to anterior spinal fusion. This study analyzes the stability and biomechanics of the spine under the use of the cage of
different bearing areas individually.
The finite element method was used to analyze the mechanical behaviors of the vertebrae in the following cases. (1) Cage with L4-L5 vertebra, (2) cage with posterior fixator of different size, (3)cage with single or double posterior fixator, (4) different implanted positions of the cage with small bearing area and under comb ined loads of compress, flexion and torsion.
The results are compared under the following headings: (1)cage with or without posterior fixator; (2)different implanted positions of the cage with small bearing area; (3)max. von Mises stress of
posterior fixator under different situation.
The results show that the cage with big bearing area are better than the cages with small bearing area under the considerations of stability and biomechanics. However, the high stresses in the cages with small bearing area could be reduced by the use of posterior fixator, while cooperating with posterior fixator, the minor diameter of the screw should be greater than 6mm. In entity tests, 2-hole cages with the jigs attained to plastic deformation at a load of 15000N. When in the condition of without jigs, they attained to
plastic deformation at a load of 10000N.
Subjects
聚乙醚酮椎籠
PEEK cage
Type
thesis