Purpose To improve the method of PDA closuremanipulation for occluding larger PDAs with the diameter5mm Method:For 3 patients after perforating the femoral artery,a guiding wire wasintroduced into the aortic atery and past through the PDA.Along the wirea balloon catheter was adopted to explore the real internal eiameter and thedistensibility of the PDA.Using a multi-usable catheter which remade fromthe coronary angiographic catheter and had a relative larger cavity was easyto push the coil.Result:The diameters of 3 patients were 6.0,6.3 and40 minutes.A small shunt existed in only one case and disappeared onemonth late.Conclusion:The improved method is safe and valuable forclmical application.
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