水力軸承軸流式血泵的設計與測試

心臟病的末期病患，在藥物控制與傳統手術均無法治療的情況下只有換心一途，但心臟捐贈者遠不及需要換心的病患，遂而發展出替代的心室輔助器。本文以純流體動力軸承軸流式心室輔助器為設計，並以計算流體力學進行初步模擬，目標為流量Q=5 L/min及100 mm Hg的壓差。而介於定子與轉子間的潤滑薄層為50μm，且能產生潤滑及軸頸軸承的作用。以蒸餾水溶液測試在轉速11,000 rpm時流量可達5 L/min，最大壓差為50 mm Hg，而利用體積比36%甘油與64%蒸餾水混合成血液模擬溶液進行實驗量測，在轉速9,000 rpm時流量可達5 L/min，最大壓差為25 mm Hg，雖不達設計目標，但從幫浦性能曲線圖之趨勢來看，轉速增加時，流量與壓力均會提升。

關鍵字

流體動力軸承；心室輔助器；計算流體力學；潤滑；間隙；軸頸軸承；幫浦性能曲線

並列摘要

Cardiovascular disease is the major leading cause of death world wide. The success rate for heart replacement surgery exceeds 90 %, but the demand exceeds the supply. While waiting for a replacement, the patients must rely temporarily on artificial hearts or ventricular assist devices (VAD). The purpose of this study is to design an axial blood pump by using the hydrodynamic bearing theory, and simulate the initial design by the Computational Fluid Dynamics (CFD) method, which exceed the 5 L/min flow rate and 100 mm Hg pressure head. The fluid-film size between the rotor and stator is 50μm, which can account for lubrication and journal bearing. This pump was tested in distilled water which can produce a flow rate of 5 L/min with 50 mm Hg pressure head increase at 11,000 rpm. And it was tested in blood fluid analog which was 36% aqueous glycerin and 64% distilled water by volume. The result indicated that it can produce a flow rate of 5 L/min with 25 mm Hg pressure head increase at 9,000 rpm. Although the result does not reach the design object, but from the trend of pump performance curve, the flow rate and the pressure head all arise when the revolutions per minute increased.

並列關鍵字

hydrodynamic bearing ； VAD ； CFD ； lubrication ； fluid-film ； journal bearing ； pump performance curve

參考文獻

1. Mason VF, Konicki AJ: Left ventricular assist devices as destination therapy. AACN Clin lssues, 14: 488-497, 2003.

2. Anderson DW, Blood pumps: Technologies and markets in transformation. Artif Organs, 25: 406-410, 2001.

3. Olsen DB, The history of continuous flow blood pumps. Artif Organs, 24: 401-404, 2000.

5. Samnels LE, Holmes EC, Thomas MP, et al: Management of acute cardiac failure with mechanical assist: Experience with the ABIOMED BVS 5000. Ann Thorac Surg, 71: 67-72, 2001

6. Vitali E, Lanfranconi M, Ribera E, et al: Successful experience in bridging patients to heart transplantation with the MicroMed DeBakey ventricular assist device. Ann Thorac Surg ,75: 200-4, 2003.

國際替代計量

水力軸承軸流式血泵的設計與測試

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