Oscillations in a collapsed-tube analog of the brachial artery under a sphygmomanometer cuff.
Oscillations in a collapsed-tube analog of the brachial artery under a sphygmomanometer cuff.
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血压计袖带下的肱动脉折叠管模拟物中的振动。
DOI：
10.1115/1.3168364
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
K. Butcher
中科院分区：
文献类型：
--
作者：
C. Bertram;C. Raymond;K. Butcher
为了确定Starling电阻器中的自激振荡是否与生理情况相关，输送水流的可折叠管仅沿其无支撑长度的中心段沿着被外部加压。这是通过使管穿过以Starling电阻器方式安装在压力室中的较短且较宽的可收缩套管来实现的。管的尺寸和材料，以及所有其他实验参数，如我们以前的Starling电阻器研究中所使用的。低频和高频的自激振荡进行了观察，但低频振荡是敏感的套管类型和长度相对于无支撑的距离。压力-流量特性显示出多种振荡模式，这与在可比的Starling电阻器中观察到的模式在数量上不同。驱动压力的缓慢变化根据压力是上升还是下降而给出不同的行为，这与在特性曲线和管定律中指出的滞后性是雅阁的。结果进行了讨论，在各种可能的机制可折叠管不稳定性，并提出的原因，在大多数生理情况下的低频模式的情况下。
To determine whether self-excited oscillations in a Starling resistor are relevant to physiological situations, a collapsible tube conveying an aqueous flow was externally pressurized along only a central segment of its unsupported length. This was achieved by passing the tube through a shorter and wider collapsible sleeve which was mounted in Starling resistor fashion in a pressure chamber. The tube size and material, and all other experimental parameters, were as used in our previous Starling resistor studies. Both low- and high-frequency self-excited oscillations were observed, but the low-frequency oscillations were sensitive to the sleeve type and length relative to unsupported distance. Pressure-flow characteristics showed multiple oscillatory modes, which differed quantitatively from those observed in comparable Starling resistors. Slow variation of driving pressure gave differing behavior according to whether the pressure was rising or falling, in accord with the hysteresis noted on the characteristics and in the tube law. The results are discussed in terms of the various possible mechanisms of collapsible tube instability, and reasons are presented for the absence of the low-frequency mode under most physiological circumstances.