Biological properties of expandable bridge-arch interbody fusion cage

doi:10.3969/j.issn.2095-4344.2014.22.025

Abstract

Abstract:

BACKGROUND: As spine endoscope and other microinvasive techniques develop, various fusion cages in particular expanded cage become the hot topic.

OBJECTIVE: To introduce the design concept and biological characteristics of the novel expandable bridge-arch interbody fusion cage to treat lumbar degenerative disease.

METHODS: A computer-based online search of Wanfang, CMB and VIP databases was performed for articles published between January 2000 and April 2011 related to the application of fusion cages in lumbar degenerative disease, with key words “lumbar degenerative disease, interbody fusion cage”. Insufficiency in present cages was analyzed and a novel cage should be designed.

RESULTS AND CONCLUSION: A total of 50 relevant literatures were collected, and 27 were included. Results showed that ideal expandable cage should have small size, convenience to placement, excellent biomechanical stability, and prevent postoperative loss of intervertebral height. Therefore, this novel expandable bridge-arch interbody fusion cage was developed. The novel cage has a very good perspective of application for many advantages, such as mini-invasive implantation, excellent stability and powerful ability to prevent sink.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

全文链接：

Key words: spine, intervertebral disc, spinal fusion, lumbar vertebrae, internal fixators

CLC Number:

R318

Li Ying, Zeng Zhao-feng, Zhang Chun-lin, Yan Xu. Biological properties of expandable bridge-arch interbody fusion cage[J]. Chinese Journal of Tissue Engineering Research, 2014, 18(22): 3593-3596.

Figures/Tables 2

图中膨胀中套管管壁上若干个形状相似但不连续的不规则的割除残留部分逐次膨胀形成一定数目的“桥墩”，同时滑移外套管也发生弧形变形形成“桥面”即与椎体骨质的触面，在一定范围内可根据椎体骨表面凸凹情况自动波形变形，且触面面积较大，使椎体骨质受力较小也较均匀。滑移外套管包括呈“U”形的滑槽管和滑片管两部分，滑槽管和滑片管均有管状部分和可形变的片状部分。滑槽管可形变的片状部分有一滑槽，滑片管可形变的片状部分有一对滑片，滑片安装于滑槽内，滑片和滑槽可相对滑动[21]。滑移外套管的两端固定于膨胀中套管的外部，即滑槽管的管状部分固定于膨胀中套管的一端，滑片管管状部分固定于膨胀中套管的中部非膨胀部位，滑槽管和滑片管可形变的片状部分刚好覆盖膨胀中套管管壁上若干个形状相似但不连续的不规则的割除残余部分。固定内杆位于膨胀中套管内部，固定内杆内有螺纹与手柄相连。使用时，将滑移外套管置入处理好的椎间隙(即椎板软骨已清除并已植入骨粒，旋转手柄，膨胀中套管受到挤压发生形变，膨胀中套管管壁上若干个形状相似但不连续的不规则的割除残留部分逐次膨胀形成一定数目的“桥墩”，同时滑移外套管也发生弧形变形形成“桥面”即与椎体骨质的触面，由于滑移外套管“桥面”部分为相互滑移结构且具有一定弹性，椎体骨表面凸起时“桥面”对应部分即凹陷[22-23]，反之，骨表面凹陷则“桥面”对应部分即凸起，这样触面在一定范围内可根据椎体骨表面凸凹情况自动波形变形，且触面面积较大，使椎体骨质受力较小也较均匀，这些受力部位骨质就会很少吸收，防止术后椎间隙高度过多丢失，从而保证疗效。"

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