Artificial lungs with blood-side channels on a 10 to 40 μm scale would be characterized, similar to the natural lungs, by tens of thousands to hundreds of millions parallel blood channels, short blood paths, low pressure drops, and low blood primes. A major challenge for developing such devices is the requirement that the multitude of channels must be uniform from channel to channel and along each channel. One possible strategy for developing microchannel artificial lungs is to fill broad rectangular channels with micro scale screens that can provide uniform support and stability. The present work explores the effectiveness of 40 μm screen-filled blood-side channels and, as a comparison, 82 μm screen-filled channels. Small concept-devices, consisting of a single 69 mm wide and 3 or 6 mm long channel, were tested using 30% hematocrit blood and oxygen or air on the gas side. The measured oxygen fluxes in the devices were in the range of 4 to 9×10-7 moles/(min·cm2), with the latter close to the theoretical membrane limit. The pressure drop was in the range of 1 to 6 mmHg. Extrapolating the data to a device designed to process 4 L/min suggests a required blood prime of only 35 mL.
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机译:类似于自然肺,具有10到40μm规模的血液侧通道的人造肺的特征是成千上万至数亿个平行的血液通道,短的血液路径,低压降和低血流量。开发这样的设备的主要挑战是要求每个通道之间以及沿着每个通道的多个通道必须是统一的。开发微通道人工肺的一种可能策略是用可以提供均匀支撑和稳定性的微型筛网填充宽阔的矩形通道。目前的工作探讨了40μm的筛网充满血液的通道以及82μm的筛网充满血液的通道的有效性。小型概念设备由单个69毫米宽,3或6毫米长的通道组成,在气侧使用30%的血细胞比容和氧气或空气进行了测试。装置中测得的氧通量范围为4至9×10 -7 sup>摩尔/(min·cm 2 sup>),后者接近理论膜限制。压降在1至6mmHg的范围内。将数据外推到设计为以4 L / min的速度处理的设备上,表明所需的血液灌注仅为35 mL。
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