Formulation of Monodisperse Contrast Agents in Microfluidic Systems for Ultrasonic Imaging

K. Hettiarachchi, P. Dayton, A.P. Lee
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引用次数: 6

Abstract

We have successfully demonstrated a microfluidic flow-focusing method to produce monodisperse contrast agents with a mean diameter of 4.0 microns, which is optimal for current ultrasonic imaging techniques. Currently available microbubble contrast agents are produced with agitation techniques, and the random nature of this process results in a highly polydisperse size distribution. PDMS-based microfluidic flow-focusing systems are a cost-effective means to easily and rapidly produce bubbles with a diameter of a few microns. Our device uses expanding nozzle geometry, focusing the bubble break-off location to one single point located at the orifice, which enables the formation of monodisperse bubbles. The geometry of the channel junctions in addition to the liquid and gas flow rates are used to control the bubble sizes. Using this technique, the microbubble diameter can be easily tailored to produce contrast agents with a precise size distribution optimized for various ultrasonic imaging applications
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超声成像微流体系统中单分散造影剂的研制
我们已经成功地展示了一种微流体流动聚焦方法来生产平均直径为4.0微米的单分散造影剂,这是当前超声成像技术的最佳选择。目前可用的微泡造影剂是用搅拌技术生产的,这一过程的随机性导致了高度分散的尺寸分布。基于pdm的微流体聚焦系统是一种经济高效的方法,可以轻松快速地产生直径为几微米的气泡。我们的设备使用扩展喷嘴几何形状,将气泡破裂位置聚焦到位于孔板的单个点,从而形成单分散气泡。通道结的几何形状以及液体和气体的流速被用来控制气泡的大小。使用这种技术,微泡直径可以很容易地定制,以生产具有精确尺寸分布的造影剂,优化各种超声成像应用
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