具雙向可變形的脊椎融合器設計製作與檢測

Design, Manufacture, Analysis, and Testing of a Spinal Fusion Cage with a Bidirectional Expandable Design

本文主要設計開發可變形脊椎融合器（Cage），對其進行結構設計、Ansys分析及製造，及本文探討3D列印多孔鈦合金試片之熱處理溫度對三點彎曲的抗彎強度之影響。在Cage設計製造部分，利用SolidWorks繪圖設計的Cage繪製成圖檔，接著於SolidWorks中模擬Cage運作之情形，完成後匯入CNC加工機進行列印上下面板及實心傳動元件，並將完成的元件組合成Cage成品，再測試Cage產品運作流暢度，且Cage實體量測後得知可擴展高度25%及擴展寬度17%。為了確保可變型脊椎融合器安全性，以防止受力過大而導致崩毀，對Cage施於400 N作用力的Ansys模擬分析及力學行為之研究。另外會利用3D列印多孔鈦合金試片用不同熱處理溫度做實驗，並進行三點彎曲實驗，其最適化熱處理500℃試片，經模擬分析與實驗的位移量分別為1.539 mm與1.738 mm，Ansys分析模型可證實是有分析參考價值，並證明熱處理確實可以增加試片的楊氏係數和抗彎強度。

This study developed a spinal fusion cage with a bidirectional expandable design and evaluated the effect of heat treatment on the flexural strength of three-dimensional (3D)–printed porous titanium alloy specimens. The cage was designed in SolidWorks and fabricated in a computer numerical control machine. Tests were conducted to evaluate the fluency of the cage. The experimental results indicated that the cage height can be increased by 25% and the width can be increased by 17%. Structural analysis in Ansys revealed that the cage can withstand 400 N. In addition, 3D-printed porous titanium alloy specimens were fabricated for use in heat treatment experiments that used three-point bending. According to the experimental results, the displacements of the test piece heated to 500°C were 1.539 and 1.738 mm. Structural analysis results indicated that heat treatment increased the Young’s modulus and flexural strength of the test pieces.