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題名 | 電水式碎石機之可調整間距電極棒設計=Design of Gap-Controlled Electrodes for Electrohydraulic Lithotriptors |
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作者姓名(中文) | 梁勝明; 顏志成; 張建成; | 書刊名 | Journal of Medical and Biological Engineering |
卷期 | 22:增刊 民91.12 |
頁次 | 頁S33-S38 |
分類號 | 410.025 |
關鍵詞 | 體外震波碎石機; 除氣水; 可控制間距電極棒; 空蝕; Extracorporeal shock wave lithotriptors; Degassed water; Gap-controlled electrodes; Cavitation; |
語文 | 中文(Chinese) |
中文摘要 | 由於傳統電擊棒間距會因熔蝕而隨震波次數增加而變大,導致聚焦壓力下降。為克服此缺點,本研究主要在設計可控制間距電極組,控制間距可以產生更穩定的聚焦壓力。可控制間距電極組與不可控制間距電極組其設計原理最大差異在於不可控制間距電極組無法維持穩定聚焦壓力。在相同電壓、相同波傳遞介質下,從結石粉碎程度比較可顯現出可控制間距電極組的優點。除此之外,本研究還探討不同電極材質-青銅、鎢鋼-對於第二焦點處聚焦壓力的影響。一般電水式震波碎石機所使用的自來水含有少量空氣,會造成能量損耗,使得聚焦壓力大受影響。因為無空蝕產生,震波於除氣水中的聚焦壓力比用自來水來的大。本研究亦利用自來水與除氣水來測試可控制間距電極組的性能。 |
英文摘要 | Since the gap between two traditional electrodes increases with number of shock waves because of wearing, the increasing gap results in decreasing focused pressures. To overcome this disadvantage, this study is to design gapcontrolled electrodes for a shock wave generator of an electrohydraulic lithotriptor. There is greatly different performance between the non-gap-controlled electrodes such as the traditionally imbedded electrodes and our designed gap-controlled electrodes. The non-gap-controlled electrodes can't produce uniform peak pressures at different operating voltage settings, but the gap-controlled electrodes can. It was found that our designed gapcontrolled electrodes produced more stable, uniform peak pressures at the second focus than the non-gap-controlled electrodes did. The performance of the gap-controlled electrodes was evaluated by testing their capability of stone disintegration in water. Two electrode materials composed of bronze and tungsten were studied. Their effects on the focused pressure were investigated. Tap water that usually contained little gas was often used for electrohydraulic lithotriptors, resulting in energy loss. Because of cavitation, the focused peak pressures in tap water were lower than those in degassed water. Experiments were conducted to test the extent of stone disintegration in the degassed and tap water for examining the performance of our designed gap-controlled electrodes. |
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