Wear Analysis of Artificial Intervertebral Disc
Date Issued
2007
Date
2007
Author(s)
Lu, Hong-Da
DOI
zh-TW
Abstract
The wear behavior of the artificial intervertebral discs designed in the present work was studied. An intervertebral disc simulator was designed and constructed for performing the experiment. This simulator allows the tested disc make the flexion-extension of 14°, lateral bending of ±7° and rotation of ±2.5° under a cyclic frequency of 3 Hz, exerts a load up to 1500±50N. During a test, the artificial intervertebral disc was soaked in a 25% blood serum solution. The thickness and the weight decrement of the disc were measured and the wear debris was exammed in every five-hundred thousand cycle operation.
From the experimental results we find that, using PEEK as the core material of the artificial intervertebral disc is better in the abrasion and the distortion than using UHMWPE. The experimental results also show that the semi-ellipsoidal surface design causes the contact area to wear severely when combined bending and rotating motion took place. In addition, the precision in processes and the surface roughness of the metallic parts were responsible for core wear.
The semi-ellipsoidal surface will be replaced by a hemispheroidal surface in the next device design. The required surface roughness of the metallic parts should be as low as ＝0.05μm.
In the future, we will try to implant the artificial intervertebral disc into suitable animals in vivo, and observe cellulary tissues nearby the substitute whether will have the inflammation or other bad situation happen.
Subjects
磨耗
人工椎間盤
聚芳醚酮
wear
artificial intervertebral discs
PEEK
UHMWPE
Type
thesis
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