On the Hydrogen peroxide/low temperature Plasma discharging Sterilization (HPDS), an attempt to observe the diffusion of the active spiecies (・OH, ^1O_2) into the narrow space has been done in the medical device by simple simulation. The diffused active spiecies into the appointed sizing polyestertubes (Dacron, Inner Diametr: 2, 3, 6mmφ, Length: 50, 100, 150, 300cm) was detected from the color changing of indicators (DPPH, Ascorbic acid) in the small glass tubes set to the one end of the polyester tubes, respectively. Similar discussions were also checked up on using the glass capillaried tubes.
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