A stent assembly for providing stimulation to heart tissue at a target site comprises a stent body of a size to be implanted and retained in the position proximal to the target site； and an electrode assembly arranged to extend longitudinally from the stent body within the target blood vessel in a distal direction from the proximal position to the target site to be stimulated. The stent assembly may comprise a battery which is remotely chargeable by induction. The stent assembly may comprise an assembly for storing and dispensing an active substance such as a drug or medication, or more particularly a steroid.
