A treatment machine for a medical device, such as an endoscope washer-disinfector, that is intended to be integrated into a wall, referred to as a separation wall, at a through opening (O M) in the separation wall, the wall being intended to separate a first enclosure (Sg) having a controlled/uncontrolled atmosphere from a second enclosure (Sb) having an uncontrolled/controlled atmosphere, said machine comprising: - a treatment tank having a first opening that is configured to allow loading/unloading of a medical device from the first enclosure (Sg) and a second opening that is configured to allow loading/unloading of a medical device from the second enclosure (Sb), - a first door system that tightly seals the first opening, - a second door system that tightly seals the second opening, - a treatment system for a medical device having one or more treatment circuits, including one or more pumps and one or more solenoid valves, allowing treatment of the interior and exterior surfaces of the medical device contained in the treatment tank through immersion in and/or spraying of disinfectant solution taken from a reservoir outside the treatment tank, - a programmable logic controller system that controls the treatment system, particularly the motor and the solenoid valves of the system, and is configured for the implementation of a disinfection cycle of a medical device, characterized in that said machine comprises: - a partitioning interface that is intended to be permanently fixed to the wall and configured so as to close the opening (O M) in the wall, said partitioning interface comprising at least one through opening that is intended to be opposite the second opening in the tank, at least when the treatment machine is in the operating position, the second door system being secured to said partitioning interface, ensuring, in its closed position, the closure of said opening in the partitioning interface, - a movable part that can be removed from the partitioning interface and comprises a self-supporting chassis and at least partially includes the pump(s) and solenoid valves of said treatment system of the medical device as well as said programmable logic controller, which, when the treatment machine is in the operating position, is configured to position itself in the immediate vicinity of the partitioning interface, namely in such a way as to allow, during maintenance on the treatment system, the removal of the mobile part of the treatment machine while said partitioning interface of the treatment machine continues to close the opening in the wall, the opening in the partitioning interface then being closed by the second door system. - a treatment tank having a first opening that is configured to allow loading/unloading of a medical device from the first enclosure (Sg) and a second opening that is configured to allow loading/unloading of a medical device from the second enclosure (Sb), - a first door system that tightly seals the first opening, - a second door system that tightly seals the second opening, - a treatment system for a medical device having one or more treatment circuits, including one or more pumps and one or more solenoid valves, allowing treatment of the interior and exterior surfaces of the medical device contained in the treatment tank through immersion in and/or spraying of disinfectant solution taken from a reservoir outside the treatment tank, - a programmable logic controller system that controls the treatment system, particularly the motor and the solenoid valves of the system, and is configured for the implementation of a disinfection cycle of a medical device, - a partitioning interface that is intended to be permanently fixed to the wall and configured so as to close the opening (O M) in the wall, said partitioning interface comprising at least one through opening that is intended to be opposite the second opening in the tank, at least when the treatment machine is in the operating position, the second door system being secured to said partitioning interface, ensuring, in its closed position, the closure of said opening in the partitioning interface, - a movable part that can be removed from the partitioning interface and comprises a self-supporting chassis and at least partially includes the pump(s) and solenoid valves of said treatment system of the medical device as well as said programmable logic controller, which, when the treatment machine is in the operating position, is configured to position itself in the immediate vicinity of the partitioning interface, namely in such a way as to allow, during maintenance on the treatment system, the removal of the mobile part of the treatment machine while said partitioning interface of the treatment machine continues to close the opening in the wall, the opening in the partitioning interface then being closed by the second door system.