. . . "Over a relatively short period of time, thrombi will form in and on the device 80 and the thrombi will occlude the PDA. If so desired, the device may be coated with a suitable thrombolytic agent to speed up the occlusion of the PDA. FIGS. 9A and 9B are a side view and an end view, respectively, of yet another embodiment of the present invention." . .