A method for forming an implantable medical device, such as a stent, is provided,
in which electric discharges are applied to a metal surface of the implantable
medical device. The electric discharges pit the surface. The pitted surface improves
retention of a coating on the device and increases the amount of coating that can
be carried by the device. An electric discharge machining process is described
for applying electric discharges to the surface of the implantable medical device
or portion thereof.
