臺灣博碩士論文加值系統

　　心導管手術是一種診斷與治療心血管疾病之微創手術，傳統上手術進行時需藉由抽換不同曲率導引線才能將心導管跨越血管分岐處並伸入至心臟，此過程繁複耗時而造成臨床應用不便。新興的電驅動聚合物中，離子性聚合物與金屬複合材料（ionic polymer-metal composite, IPMC），簡稱離子複材，具有低電壓驅動下能產生大幅彎曲之特性，因此本研究主旨是藉由離子複材發展前端曲率可控制之心導管導引線，期望能減少導引線替換次數並縮短手術時間。為了因應離子複材複雜的物理化學特性以及導引線微小化和曲率控制等要求，本研究進程上分成四個子目標：（1）金質離子複材製程、（2）離子複材動態模型與機電特性分析、（3）適應性曲率回授控制以及（4）致動暨感測離子複材之發展。

　　傳統離子複材是在陽離子交換膜上下表面鍍上鉑金屬作為導電層所構成，致動前需令交換膜充滿電導液。為了降低製作成本和提昇可靠度，本研究除了提出以鎳基催化反應（nickel substrate-catalyzed reaction）製作金質導電層之離子複材，另一方面則是參考並改善文獻方法以充盈還原鍍金反應（impregnation-reduction reaction）製作離子複材。為了分析離子複材致動特性機電特性與後續之機械設計，本研究除了以系統識別理論建立動態系統經驗模型，亦推導參數具物理涵義之離子複材機電系統模型。為了控制各種致動環境下離子複材非線性且時變之曲率響應特性，本研究發展了自調式內嵌積分作用調節器（direct self-tuning regulator embedded with integrator, DSTR），其以具有積分作用之極零點控制器架構與性能參考模型以及參數估測機制所組成。由於常規感測器尺寸過大，離子複材響應回授控制通常難以實現於工作空間狹窄之應用，故本研究針對心導管手術另外提出了可切換感測或致動能力之離子複材設計，其利用調幅解調（amplitude modulation-demodulation）方式讀取離子複材因致動形變所造成的導電層電阻變化並以此作為形變感測訊號。

　　經實驗證實，本研究提出的鎳基催化鍍金製程僅需以常見的陰離子型金錯鹽便能在24小時內製作出金質離子複材，而充盈還原鍍金反應製程則需合成特殊的陽離子型金錯鹽且製程時間長?48小時以上。由經驗模型可知離子複材為三至四階非極小相位系統，而本研究推導之機電系統模型指出，離子複材曲率響應變異主要與機械剛性、交換膜導電度和介電常數有關。在響應控制方面，本研究設計的DSTR控制器能於2 sec內估測出控制器參數，因此對於頻率低於1 Hz以下而振幅3 m^-1以內之任意波形命令其能有效控制響應使追?誤差低於0.1 m^-1。本研究提出的調幅解調訊號處理流程可在無外加感測器的情況下透過離子複材表面導電層電阻變化估測出離子複材靜態或動態形變，並且藉由離子複材致動和感測功能之間的切換?到減少心導管導引線抽換頻率以及定位效果。經主動導引模擬實驗得知本研究設計的離子複材導引線原型可穿越約150度之Y型分岐流道，未來若能進一步提昇離子複材致動力並微型化則可望將主動導引線實際應用於心導管手術。

Cardiac catheterization is one of minimally invasive surgeries to diagnose or to treat coronary heart diseases. The typical catheterization is inconvenient for the surgeons, owing to frequent changes of guidewires with different shapes and curvatures for steering a cardiac catheter to pass crotched vessels and into the heart. In the field of electroactive polymers, the ionic polymer-metal composite (IPMC) has the capability to generate large bending deformation by a low electrical driving power. The main goal of this study is to develop an active guidewire having tip-curvature that can be modulated by the IPMC, and this design may not only reduce the frequency of changing guidewires but also save the operation time. To explore the complicated physicochemical properties of the IPMC, miniaturize the guidewire and control the tip-curvature, the sub-goals of this study are: (1) the manufacture of the gold-based IPMC, (2) the dynamic model and the analyses of electromechanical properties for the IPMC, (3) adaptive curvature feedback control, and (4) the development of the sensing/actuating IPMC.

The IPMC typically consisted of a cation-exchange membrane sandwiched in two platinum layers as electrodes, and the membrane required to soak up conductive solvent before the actuation. For low cost and reliable fabrication of the IPMC, the nickel substrate-catalyzed reaction of gold electroless plating was proposed in this study. Besides, the impregnation-reduction reaction method suggested in the literatures was realized and improved to manufacture the gold-based IPMC. For analyzing the actuating characteristics and the mechanical design of the IPMC, not only an dynamic empirical model was constructed but also an electromechanical model with parameters having physical sense was derived. For controlling the nonlinear time-varying tip-curvature responses of the IPMCs actuated in varied environments, a direct self-tuning regulator with integral action (DSTR) was designed. It consisted of a pole-placement control structure embedded integral action, a reference model, and a self-tuning mechanism. Due to the bulky size of displacement sensors, the implementations of feedback controls of the IPMCs were infeasible for the cardiac catheterization. Thus a sensing/actuating IPMC transducer by employing the amplitude modulation-demodulation technique to obtain deformation of the sensing IPMC from the variation of electrical resistances was investigated.

In contrast to the impregnation-reduction reaction which employed a specific gold complex salt to produce a gold-based IPMC and consumed more than 48 hr production time, the nickel substrate-catalyzed reaction can utilize general gold complex to produce the IPMC within 24 hr. The IPMC was a 3rd or 4th order non-minimum phase dynamic system from the system identification result. Analyses by using the electromechanical model indicated that the variations of the tip-curvature responses depended on the mechanical stiffness of the IPMC, the conductivity and the dielectric constant of the ion-exchange membrane. The DSTR could achieve convergence of process parameters within 2 sec, and the controlled curvature could follow arbitrary waveform commands with frequency within 1 Hz and amplitude of 3 m^-1. The absolute tracking error was lower than 0.1 m^-1. For the sensing/actuating IPMC, the deformation-sensing approach based on the variation of surface resistances in the IPMC electrodes can estimate the static or dynamic deformation successfully without other sensors. Besides, a simulated catheterization demonstrated the potentials of reducing the frequent changes of guidewires and locating the tip-position in catheterization. The prototype of the IPMC guidewire could pass through a Y-shape bifurcation vessel of 150 degree smoothly. If the actuating force and the size of the IPMC can be enhanced and scaled down, the active guidewire will be realized to the cardiac catheterization.

中文摘要 i
Abstract iii
誌　謝 v
目　錄 vi
表目錄 xii
圖目錄 xiii
符號說明 xx
第一章 緒　論 1
1.1 心導管手術沿革 1
1.2 電驅動聚合物 5
1.3 文獻回顧 7
1.3.1 主動式心導管及導引線 7
1.3.2 離子性聚合物與金屬複材 10
1.4 研究動機與目的 26
1.5 本文架構 27
第二章 金質離子複材製程與特性量測 28
2.1 基材催化鍍金反應 28
2.2 充盈還原鍍金反應 31
2.2.1 材料製備 33
2.2.2 製程步驟 35
2.3 特性量測實驗 37
2.3.1 致動性能定義 37
2.3.2 量測平台設置 39
2.3.3 實驗設計 41
第三章 離子複材動態模型 43
3.1 系統識別經驗模型 43
3.1.1 參數式模型 44
3.1.2 非參數式模型 47
3.2 機電參數模型 48
3.2.1 電路系統轉移函數 48
3.2.2 機電轉換系統 50
3.2.3 機械轉移函數 50
3.3 參數估測與驗證 52
第四章 離子複材曲率回授控制 54
4.1 直接型參數自調內嵌積分作用調節器 55
4.1.1 極點規劃控制設計 56
4.1.2 控制器參數估測 60
4.1.3 反積分終結 62
4.2 比例積分微分控制器 63
4.3 控制器實現和性能指標 64
第五章 致動暨感測離子複材 66
5.1 形變感測原理 66
5.2 調幅解調感測實驗 71
5.3 離子複材導引線原型 74
第六章 結　果 76
6.1 製程實現與測試 76
6.2 致動特性量測 80
6.3 動態系統模型 85
6.4 曲率回授控制 98
6.5 調幅解調形變感測 109
6.6 離子複材導引測試 114
第七章 討　論 117
7.1 離子複材製程與致動特性 117
7.2 系統模型與機電參數 120
7.3 適應性曲率控制 123
7.4 致動暨感測離子複材 126
7.5 離子複材主動導引 128
第八章 結　論 129
8.1 貢　獻 129
8.2 總　結 130
8.3 建　議 132
參考文獻 134
簡　歷 141

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