A medical device in the form of a cartridge incorporating an assembly allowing the preservation of previously removed corneal tissue, the device comprising: - an at least partially transparent base, - at least one side wall, - means for receiving and locking corneal tissue, and - a transparent lid for covering an opening in the side wall opposite the base, - a storage compartment containing a preserving fluid, - at least one inlet terminal upstream of the storage compartment, said inlet terminal being intended to be connected to a device for injecting compressed pressurizing gas, the pressurizing gas allowing: ∘ to eject the preserving fluid contained in the storage compartment to the preservation chambers, ∘ to maintain the preserving fluid at a predefined pressure, the device being configured such that, in use, the base, the side wall, and the lid define with the corneal tissue endothelial and epithelial preservation chambers, characterized in that the device further comprises, upstream of the preservation chambers: - at least one control terminal upstream of the storage compartment, said control terminal being intended to be connected to a control compressed gas injection device, - a pneumatically piloted switching system downstream of the terminals (21, 22), said switching system being piloted by the control compressed gas to allow or prohibit the flow of the pressurizing compressed gas to the storage compartment. - an at least partially transparent base, - at least one side wall, - means for receiving and locking corneal tissue, and - a transparent lid for covering an opening in the side wall opposite the base, - a storage compartment containing a preserving fluid, - at least one inlet terminal upstream of the storage compartment, said inlet terminal being intended to be connected to a device for injecting compressed pressurizing gas, the pressurizing gas allowing: ∘ to eject the preserving fluid contained in the storage compartment to the preservation chambers, ∘ to maintain the preserving fluid at a predefined pressure, ∘ to eject the preserving fluid contained in the storage compartment to the preservation chambers, ∘ to maintain the preserving fluid at a predefined pressure, the device being configured such that, in use, the base, the side wall, and the lid define with the corneal tissue endothelial and epithelial preservation chambers, characterized in that the device further comprises, upstream of the preservation chambers: - at least one control terminal upstream of the storage compartment, said control terminal being intended to be connected to a control compressed gas injection device, - a pneumatically piloted switching system downstream of the terminals (21, 22), said switching system being piloted by the control compressed gas to allow or prohibit the flow of the pressurizing compressed gas to the storage compartment. - at least one control terminal upstream of the storage compartment, said control terminal being intended to be connected to a control compressed gas injection device, - a pneumatically piloted switching system downstream of the terminals (21, 22), said switching system being piloted by the control compressed gas to allow or prohibit the flow of the pressurizing compressed gas to the storage compartment.