该制剂口服后可以维持自身密度小于胃内容物密度，从而较长时间在胃中呈漂浮状态，而不受胃排空速率的影响。

FDDS have a bulk density lower than gastric fluids and thus remain buoyancy in the stomach without affecting the gastric emptying rate for a prolonged period of time.

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在胃排空、胃收缩或胃蠕动时，由于胃的形态、容积及其内容物组成情况的改变较大，电特性变化非常明显，变化规律与胃动力学状况相对应，相关性强。

During the digest course the electrical property of the stomach alters obviously due to the change in shape, dimension, volume of gastric and the composition of stomach.

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