The four-electrode impedance technique: a method for investigation of compliance in luminal organs.
The four-electrode impedance technique: a method for investigation of compliance in luminal organs.
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DOI：
10.1088/0143-0815/9/4a/011
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发表时间：
1988-01-01
期刊：
影响因子：
--
通讯作者：
Mortensen, S O
中科院分区：
文献类型：
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作者：
Gregersen, H;Stodkilde-Jorgensen, H;Mortensen, S O
为了记录管腔器官壁的特性，研制了一种用于测量横截面面积(CA)和压力相关值的探头。这项研究的目的是在体外测试该探针。用场梯度原理在0.17~7.07 cm~2范围内测量了Ca。压力测量范围为0~20kPa150毫米汞柱。校准后，压力测量系统和CA测量系统都进行了充分的参数测量。CA测量系统依赖于流体的温度和电解液浓度，但不受激励电极外部的尺寸和形状的影响。CA和压力记录的频率上限分别为15.7和0.44赫兹。这些体外结果表明，该管组件具有足够的特性来同时测量括约肌区域的CA和压力。这两个变量可以用来描述墙体的柔度、滞回和蠕变等力学性质。
A probe for measurement of related values of cross-sectional area (CA) and pressure has been developed to record characteristics of the walls in luminal organs. The aim of this study was to test the probe in vitro. CA was measured in the range 0.17 to 7.07 cm2 by means of the field gradient principle. Pressure was measured in the range 0 to 20 kPa (150 mmHg) by external transducers. After calibration both the pressure and the CA measuring system did measure the parameters adequately. The CA measuring system was dependent on the temperature and electrolyte concentration of the fluid, but was not affected by the size and form outside the excitation electrodes. The upper frequency limits for recordings of CA and pressure were 15.7 and 0.44 Hz, respectively. These in vitro results indicate that the tube assembly has characteristics sufficient for simultaneous measurement of CA and pressure in sphincter regions. These two variables can be used to describe mechanical wall properties such as compliance, hysteresis and creep.