"To determine the drug amount on the stent after a single or dual rapamycin coating process, microporous stents were appropriately coated (n=3 each group), and rapamycin concentrations on the stents were determined by HPLC analysis. The drug amount on the stent yielded by single coating was 195±33 µg/cm2 stent surface and 317±45 µg/cm2 by double coating, respectively. The surface of an uncoated and a rapamycin-coated microporous stent is illustrated in Figure 2."
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