Transient oscillation of cavitation bubbles near stone surface during electrohydraulic lithotripsy.
Transient oscillation of cavitation bubbles near stone surface during electrohydraulic lithotripsy.
复制标题
电液碎石过程中结石表面附近空化气泡的瞬态振荡。
DOI：
10.1089/end.1997.11.55
复制
发表时间：
1997
影响因子：
2.7
通讯作者：
Preminger,GM
中科院分区：
文献类型：
--
作者：
Zhong,P;Tong,HL;Cocks,FH;Preminger,GM
使用高速摄影和声发射测量，我们研究了石材表面附近瞬态空化气泡的动力学以及电液碎石 (EHL) 过程中产生的伴随冲击波。每次火花放电时，都会产生蒸气等离子体，随后会产生围绕 EHL 探头尖端振荡的空化气泡。同时，产生三个独特的冲击波脉冲。第一个冲击波是由蒸气等离子体的快速膨胀产生的，而第二个和第三个冲击波是由空化气泡的反弹产生的。根据探头与石材表面的接近程度，空化气泡的破裂可能是对称的，从而产生强烈的冲击波发射；或不对称，导致液体射流的形成。对于本研究中使用的带有 1.9F 探头的 Nortech AUTOLITH™ 碎石机，当探头距离石材表面约 1 毫米时，会产生最大冲击波发射，而当探头尖端距离相当于约 3 毫米的最大气泡半径时，会产生最大射流速度。这些发现与临床经验一致，这表明为了获得最佳治疗效果，EHL 探头应靠近结石表面放置。
Using high-speed photography and acoustic emission measurements, we studied the dynamics of a transient cavitation bubble near a stone surface and the concomitant Shockwaves generated during electrohydraulic lithotripsy (EHL). At each spark discharge, a vapor plasma and subsequently a cavitation bubble oscillating around the tip of an EHL probe are produced. Simultaneously, three distinctive Shockwave pulses are generated. The first Shockwave is produced by the rapid expansion of the vapor plasma, while the second and third waves are produced by rebounds of the cavitation bubble. Depending on the proximity of the probe to the stone surface, the collapse of the cavitation bubble may be symmetric, resulting in a strong Shockwave emission; or asymmetric, leading to the formation of a liquid jet. For the Nortech AUTOLITH™ lithotripter with a 1.9F probe that was used in this study, maximum Shockwave emission is produced when the probe is about 1 mm from the stone surface, whereas the maximum jet velocity is produced when the probe tip is at distance equivalent to the maximum bubble radius of about 3 mm. These findings are consistent with clinical experience, which suggests that for optimal treatment results, the EHL probe should be placed close to the stone surface.