本文描述了一种作为心脏辅助装置的无瓣可压缩塑料囊腔的容积与容积变化测量法。该方法使用袖套电极测量囊腔两端的高频阻抗。在高频情况下可略去电极阻抗,使所得阻抗即为囊腔中电解质的阻抗。使所得阻抗即为囊腔中电解质的阻抗。将压缩囊腔看作两个底相连的切状锥体,可以得到囊腔阻抗与容积的关系方程。如果 This article describes a volumetric and volumetric change measurement of a non-valved compressible plastic balloon as a cardiac assist device. The method uses a cuff electrode to measure the high frequency impedance across the capsule. The impedance of the electrode can be neglected at high frequency so that the resulting impedance is the impedance of the electrolyte in the capsule. The resulting impedance is the impedance of the electrolyte in the lumen. The compression chamber as the two connected to the bottom of the cut cone, can be cavity impedance and volume relationship equation. in case