Our group received a grant from Guangdong BiosMed Medical Instrument Co. LTD on December 23, 2013. With this grant, Our group and collaboraters from BioMed will modify the surface of interventional cardiovascular catheters (Balloon Dilatation Catheter) by biocompatible polymer coatings for improving myocardial blood flow in the localized stenotic lesion of the coronary arteries.