Medical device comprising an artificial contractile structure

A medical device comprising:

• an artificial contractile structure comprising at least one contractile element configured to contract an organ such that said contractile element is in a resting or in an activated position, the activated position being defined with said contractile element constricting the organ and the resting position being defined with said contractile element not constricting the organ;
• at least one actuator configured to activate said contractile structure;
• at least one control unit comprising and controlling said actuator;
• and
• at least one source of energy configured to power said actuator,
• wherein the control unit comprises a titanium housing with at least a first chamber and at least a second chamber, and a system configured to reduce corrosion in the control unit, said system comprising a thin titanium wall constituting a flat hermetic wall between said first and second chamber,
• wherein said actuator comprises
• at least an electric motor,
• a gearhead connected to said electric motor,
• a transmission system linked to the contractile element and configured to transmit to the contractile element a force induced by said electromotor,
• a magnetic coupling device placed at the gearhead and configured to transmit to the contractile element a force induced by the motor,
• a lead screw, and
• a nut mounted on said lead screw,
• one of the nut and the lead screw being linked to said transmission system and the other of the nut and the lead screw being configured to cooperate with said gearhead,
• wherein the lead screw, the nut and a part of the transmission system are placed in the second chamber, and
• wherein the electric motor and the gearhead are placed in the first chamber, and
• the magnetic coupling device is configured to transmit the movement of the gearhead in the first chamber to either the nut or the lead screw placed in the second chamber.