所述尿道扩张导管包括设置在所述扩张导管内的上皮和闭孔装置。
The urethra dilatation catheter comprises an epitheca and a hole closing device arranged in the epitheca.
它的结构特点是一种固态基质联接的闭封口孔网状结构。
It is the structure characteristics of a solid substrate connection closed sealing hole mesh structure.
闭孔珍珠岩克服了传统膨胀珍珠岩吸水率大、强度低、流动性差的特点，延伸了膨胀珍珠岩的应用领域。
Closed pore perlite overcome traditional expansion perlite bibulous rate and low strength of large, fluidity, and the characteristics of the poor, outspread expansion perlite application fields.
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