The invention relates to a medical device in the form of a cartridge (2) incorporating an assembly permitting the preservation of corneal tissue that has been obtained beforehand by sampling, the device comprising: • a storage compartment (24) containing a preserving fluid, • at least one input terminal (21) upstream from the storage compartment (24), for injecting a compressed pressurizing gas, • at least one control terminal (22) upstream from the storage compartment (24), for injecting a compressed control gas, • a pneumatically controlled switching system (26) downstream from the terminals (21, 22), said switching system (26) being controlled by the compressed control gas in order to permit or prohibit the circulation of the compressed pressurizing gas towards the storage compartment (24).
