Microfluidic device and microfluidic system

A microfluidic system, comprising:

• a microfluidic device comprising:
• a substrate,
• a channel system arranged in the substrate,
• fluidic connections comprising a first fluidic connection and a second fluidic connection for supplying a fluid to the channel system, the fluidic connections being arranged on a first side of the substrate,
• valve seats comprising a first valve seat and a second valve seat, both formed on a second side of the substrate that is opposite to the first side, and
• an elastic membrane covering at least part of the second side of the substrate, including the valve seats,
• wherein the first valve seat is arranged in such a way that the fluid can flow from the first connection through the first valve seat into the channel system, and
• wherein the second valve seat is arranged such that the fluid can flow from the second connection through the second valve seat into the channel system, and an actuator device,
• wherein the microfluidic device and the actuator device are non-destructively detachably connectable to one another in such a way that the elastic membrane is arranged between the substrate and the actuator device,
• wherein the actuator device is configured to exert a force on the elastic membrane,
• wherein the first valve seat, the elastic membrane and the actuator device form a first valve,
• wherein the second valve seat, the elastic membrane and the actuator device form a second valve, and
• wherein the actuator device interacts with the microfluidic device such that the first valve and the second valve each have a closed position and an open position, wherein in the closed position the elastic membrane is pressed by the force into a respective one of the first valve seat or the second valve seat so that the associated valve can be brought into the closed position.