声明
摘要
Abstract
Table of Contents
Chapter 1 Introduction
1.1 A paradigm shift of medical implants:From non-degradable to bio-degradable
1.2 The history ofabsorbable magnesium implants
1.3 Magnesium for vascular stents
1.4 Degradation mechanism and the influence of physiological factors on degradation
1.4.1 GeneraHzed degradation mechanism
1.4.2 Physiological parameters influencing the biodegradation behavior
1.5 Current methodoIogies to characterize the biodegradation behavior
1.5.1 Corrosion rate
1.5.2 Corrosion products
1.5.3 Corrosion types
1.6 Surface modification technologies of magnesium implants
1.7 Research motivation
1.8 Research objectives
1.9 Dissertation Layout
Chapter 2 Flow-induced corrosion behavior of absorbable magnesium-based stents
2.1 Abstract
2.2 Introduction
2.3 Experimental
2.3.1 Magnesium alloy preparation
2.3.2 Preparation of photochemically etched Mg stent
2.4 Results
2.4.1 Fundamental model:Interaction between flow and MgZnCa rectangular plate
2.4.2 Stent model:Interaction between flow and AZ31 stent
2.5 Discussion
2.5.1 FloW-induced uniform and localized corrosion
2.5.2 Effect offlow on pitting factor
2.5.3 Effect offlow on corrosion products
2.5.4 Effect offlow on hydrogen evolution
2.6 Conclusion
Chapter 3 Flow-induced corrosion of absorbable magnesium alloy:In-situ and real-time electrochemical study
3.1 Abstract
3.2 Introduction
3.3 Experimental
3.3.1 Preparation of Mg alloy
3.3.2 Vascular bioreactor with an electrochemical monitoring system
3.3.3 Morphology and corrosion products characterization
3.3.4 Corrosion rate calculation
3.4 Results and discussion
3.4.1 Computational fluid dynamic simulation
3.4.2 Corrosion types of MgZnCa alloy under the flow conditions
3.4.3 In-situ and real-time EIS
3.4.4 Flow-induced uniform corrosion
3.4.5 Flow-induced localized corrosion
3.4.6 Flow-induced comprehensive corrosion
3.4.7 Flow-induced corrosion mechanism
3.5 Conclusions
Chapter 4 An aortal bioreactor and an aortal in vivo model:Flow conrection and diffusion induced biodegradation behavior of magnesium metal
4.1 Abstract
4.2 Introduction
4.3 Experimental
4.3.1 Pure magnesium wires preparation
4.3.2 Aortal bioreactor
4.3.3 Aortal in vivo model
4.3.4 Corrosion characterization
4.3.5 Histological analysis
4.4 Results and discussion
4.4.1 Fundamental model of fluid convection and diffusion
4.4.2 Characterization of corrosion morphologies and corrosion products
4.4.3 Volume loss and average corrosion rate
4.4.4 Correlation of calcification and corrosion rate
4.5 Conclusion
Chapter 5 A surface-eroding poly(1,3-trimethylene carbonate)coating for fully-biodegradable magnesium-based stent applications:toward better biofunction,biodegradation,and biocompatibility
5.1 Abstract
5.2 Introduction
5.3 Experimental
5.3.1 Preparation of material and coating
5.3.2 In vitro degradation tests
5.3.3 In vitro hemoeompatibility
5.3.4 In vivo animal study
5.3.5 Statistical analysis
5.4 Results
5.4.1 In vitro degradation tests
5.4.2 In vitro hemocompatibility
5.4.3 In vivo animal stuay
5.5 Discussion
5.5.1 Biodegradation mechanism
5.5.2 Hemocompatibility
5.5.3 Histocompatibility
5.6 Conclusion
Chapter 6 Summary and future research
6.1 Summary of thesis
6.2 Recommendations for future research
Acknowlegements
References
Scientific achievements
西南交通大学;