Gas control device for a ventilator

1 . A gas control device for a ventilator, wherein the device comprises a first gas channel with a first valve, the first gas channel and the first valve being configured to permit the passage of a pressurized gas stream being respiratory gas of inspiration in a first direction and to block a pressurized gas stream being respiratory gas of expiration in a second direction, an opening branching off from the first gas channel and leading to a bypass channel for the first valve, a second valve being configured to block and/or at least temporarily permit a gas stream from the first gas channel to the bypass channel, and a switching mechanism being configured to control the second valve to block and/or at least temporarily permit a gas stream from the first gas channel to the bypass channel, wherein the second the valve is configured as a pneumatic valve, a seal of the second valve closing or opening a gas-conveying connection between the opening and the bypass channel, wherein a second gas channel is configured to conduct a pneumatic control pressure onto a surface of the seal, the second gas channel being connected pneumatically to a breathing tube or the first gas channel or a blower, and the switching mechanism at least temporarily opening or closing the pneumatic connection and being configured such that if an expiratory branch of the ventilator is blocked or disrupted in a way that prevents or disrupts an exhalation of a patient, the second gas channel is blocked so that the blocked second gas channel causes the gas flow in the second gas channel, which acts on the seal, to come to a stop, as a result of which the gas flow in the first gas channel can lift the seal, which rests on the opening, so that the gas flow in the first gas channel is guided via the bypass channel around the first valve into the first gas channel and from there at least partially into the surroundings.

2 . The gas control device of claim 1 , wherein the first valve is a pneumatically actuated non-return valve, which is actuated by a force of the pressurized gas stream in the second direction, and therefore the gas stream cannot pass through the non-return valve in the second direction.

3 . The gas control device of claim 1 , wherein a respiratory gas source is configured to suction respiratory gas from the surroundings and to convey the suctioned respiratory gas along the first gas channel for inspiration in the first direction to a tube port and the breathing tube, the gas stream passing through the opened first valve which is a non-return valve.

4 . The gas control device of claim 1 , wherein the seal charged with the control pressure is configured to rest sealingly on an edge of the opening and thus prevent a gas stream from the opening into the bypass channel.

5 . The gas control device of claim 1 , wherein the seal the seal is made of an elastomeric material, is arranged to rest on the opening and comprises a weight made of metal that is present as a ring in a center of the seal.

6 . The gas control device of claim 1 , wherein the seal comprises an embossing, which is formed in the region of the weight, facing in a direction of the first gas channel.

7 . The gas control device of claim 1 , wherein the first gas channel comprises the opening for an outflow of gas with the seal and a closure cap.

8 . The gas control device of claim 7 , wherein the closure cap is configured to be placeable onto the opening, and comprises a connector piece, which is connectable to the second gas channel.

9 . The gas control device of claim 8 , wherein, during normal operation of an expiratory branch, the switching mechanism is configured to free the second gas channel and to convey a gas stream/pressure via the second gas channel and the connector piece to the seal and close the opening.

10 . A ventilator, wherein the ventilator comprises the gas control device of claim 1 .