A medical device includes an artificial contractile structure which may be advantageously used to assist the functioning of a hollow organ, an artificial contractile structure including at least one contractile element (100) adapted to contract an organ, in such way that the contractile element (100) is in a resting or in an activated position, at least one actuator designed to activate the contractile structure, and at least one source of energy for powering the actuator. The ratio &ldquocurrent which is needed to maintain the contractile element in its activated position and in its resting position/current which is needed to change the position of the contractile element&rdquo is less than 1/500, preferably less than 1/800, and more preferably less than 1/1000. The medical device further includes elements for reducing corrosion of the medical device.
