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論文名稱(外文):Snapping Force Simulations for a Safety Syringe
指導教授(外文):Huei-Huang Lee
外文關鍵詞:Safety SyringeFinite Element AnalysisStatic AnalysisSnapping ForceContact Nonlinearity
  • 被引用被引用:2
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安全針筒的概念,主要是在針筒進行注射完畢,能夠手動操作進行退針動作,將針頭、針座以及中心內拉桿留在外筒內並封起一併丟棄,以避免醫護人員意外遭針頭扎傷受感染之事件發生。本論文建立安全針筒模型,透過有限元素分析軟體ANSYS以線性材料進行靜態分析,針對針筒的變形量及應力分佈值來判定求解之合理性,最後觀察作動所需插拔力是否達到規格要求,其中包含針座之拔脫力及中心內拉桿之嵌入力,考慮到醫護人員手動操作,要求力量能夠達6 N至10 N之間,若過大可能造成施力困難,過小可能在注射時造成針筒與針座間脫落,因此得設法改善幾何或添加微特徵以取得軸向力之間的平衡。分析使用線性材料及無摩擦接觸條件進行模擬,可縮短分析時間以及提高收斂性,由於安全針筒為筒狀結構,推動時涉及大量接觸非線性,因此收歛相當不易,針對網格尺寸及接觸條件參數反覆修正改善,以取得收斂解,且插拔力量數值符合標準規格,希望能夠幫助設計者於產品開發前,初估產品作動所需插拔力、評估產品強度、發掘並改善問題,使之縮短設計開發時間與降低製造成本,進而提高設計者的判斷經驗,以及提升產業競爭力。

This paper focuses on the design of structure and the analysis of snapping force for a safety syringe with ANSYS. Design a complete procedure to simulate the insertion and retraction of safety syringe for predicting the snapping force. Optimize the structure of syringe barrel by adding significant features and adjust the analysis parameters repeatedly to make the snapping force satisfactory and easier to manipulate for medical staff. The structure modification includes adding fillets, removing materials, and changing the notch shape.
About the concept of safety syringe, the needle can be pulled back manually after injection and left inside the sealed barrel before discard. In this way, the needle would not be exposed to the environment and the contagion caused by injury accident could be prevented effectively. In this study, construct the model of safety syringe and execute the static analysis of linear material with finite element analysis software ANSYS. Estimate the rationality of deformation and stress distribution, and then observe if the snapping force is satisfactory in specification which is six to ten newtons. Because of manual operation, larger snapping force would make it difficult to manipulate, and insufficient snapping force would cause the needle to slip and endanger people. Therefore, improve the structure repeatedly to obtain optimal snapping force. Analyzing with linear material and frictionless contact can reduce computing time and make the analysis converge easily. The analysis is hard to converge because of contact nonlinearity, so continuous revision of parameters is needed to get reasonable results. This study will provide designers available data to solve problems, reduce development time, decrease production cost, and enhance the industry competitiveness.

摘要 Abstract I
Abstract II
致謝 Acknowledgments III
目錄 Table of Contents IV
表目錄 Table Captions VI
圖目錄 Figure Captions VII
第一章 緒論 Chapter 1: Introduction 1
1.1研究背景與動機 Background and Motivation 1
1.2研究方法 Approaches 2
1.3論文架構 Thesis Architecture 3
第二章 安全針筒介紹與文獻回顧 Chapter 2: Introduction and Literatures 4
2.1安全針筒簡介 Introduction of Safety Syringe 4
2.1-1背景 Background 4
2.1-2產品簡介 Introduction of Products 6
2.1-3產品功能特色 Features of Products 9
2.2文獻回顧 Literatures Review 10
2.3結構分析數值理論 Numerical Analysis Theory of Structures 19
2.3-1控制方程式 Governing Equations 19
2.3-2力平衡方程式 Equilibrium Equations 19
2.3-3應變與應力關係 Strain-Stress Relations 20
第三章 有限元素靜態分析 Chapter 3: Finite Element Static Analysis 21
3.1問題描述 Problem Description 21
3.2有限元素軟體介紹 Introduction of ANSYS 23
3.2-1軟體選用 Applied Software 23
3.2-2主要分析流程 Process of Analysis 24
3.3針筒外筒與針座之模擬 Simulations of Syringe Barrel and Base 25
3.3-1材料參數 Material Parameters 25
3.3-2幾何模型 Geometry Model 26
3.3-3接觸條件及網格 Contact Conditions and Mesh 29
3.3-4邊界條件與參數設定 Boundary Conditions and Parameters…………32
3.4外筒結構修改之分析探討 Advanced Study of Modified Barrel Structure ..35
3.4-1外筒結構材料移除 Material Removal of Barrel Structure 35
3.4-2外筒環溝形狀修改 Modification of Notch Shape 35
3.4-3倒圓角添加 Addition of Fillets 36
3.5針座與中心內拉桿之模擬 Simulations of Syringe Base and Insert 37
3.5-1材料參數 Material Parameters 37
3.5-2幾何模型 Geometry Model 38
3.5-3接觸條件及網格 Contact Conditions and Mesh 39
3.5-4邊界條件與後處理設定 Boundary Conditions and Post-processing...42
第四章 模擬結果與討論 Chapter 4: Simulation Results 45
4.1外筒與針座模擬結果 Simulation Results of Syringe Barrel and Base 45
4.1-1模擬發散問題 Simulation Divergence Problems 46
4.1-2原始設計模擬結果 Simulation Results of Original Structures 48
4.1-3 3D模擬結果驗證 Simulation Results of 3D Models 53
4.1-4外筒材料移除模擬結果 Simulation Results of Material Removal 55
4.1-5環溝形狀修改模擬結果 Simulation Results of Modified Notch 58
4.1-6倒圓角添加模擬結果 Simulation Results of Added Fillets 59
4.2針座與中心內拉桿模擬結果 Simulation Results of Base and Insert 61
4.3模擬結果比較與討論 Results Comparison and Study 62
第五章 結論與未來展望 Chapter 5: Conclusions and Future Prospects 64
5.1結論 Conclusions 64
5.2未來展望 Future Prospects 65
參考文獻 References 66
索引 Index 69
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