Study of Migration Gauging System of Interbody Devices
Date Issued
2011
Date
2011
Author(s)
Cheng, Jing-Fu
Abstract
Radiography, tomography and histology are mostly used to evaluate bone ingrowth and the cage migration in the intervertebral fusion. However, it is not accurate to measure the cage location and relative migration by radiographs. In this study, a mechanical migration gauging system of interbody cage is proposed to solve the accuracy problem. Specimens are nondestrctively subjected to flexion, extension, lateral bending and axial compression load and the cage location after cyclic loading are measured by this system. The gauging system includes three parts: the coordinate axis, the gauging devices and labview. The former is composed of spinal needle, micrometer head and precision actuator-loaded linear stage. At present, the experimental result reveals that the statistics measured by the system (the error is approximately 0.169 mm) are almost consistent with the actual situation.
Subjects
interbody cage
migration gauging system
cyclic loading
precision
spinal needle
Type
thesis
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