Pump system, use of a pneumatic resistance and medical device or gas-measuring device

A method comprising:

• providing a gas measurement device for use in medical gas measurements and/or process gas measurement applications, the gas measurement device comprising a gas flow path and a single pump unit and a plurality of different hook-up units, each of which is connectable to the single pump unit, the single pump unit comprising a single pump unit housing, the pump unit housing comprising at least two pump unit connections, wherein at least one of the hook-up units has hook-up unit connections corresponding to the at least two pump unit connections, the pump unit housing comprising a first pump unit end and a second pump unit end, the first pump unit end comprising a pump unit fluid inlet opening, the second pump unit end comprising a pump unit fluid outlet opening, the pump unit fluid inlet opening being axially opposite the pump unit fluid outlet opening with respect to a longitudinal axis of the pump unit housing, wherein the at least two pump unit connections are located between the pump unit fluid inlet and the pump unit fluid outlet, the pump unit housing comprising a pump unit housing portion extending continuously, without interruption, from at least one of the two pump unit connections to another one of the at least two pump unit connections, the gas flow path being defined by at least one of the hook-up unit connections of the at least one of the hook-up units and at least one of the at least two pump unit connections;
• connecting the at least one of the hook-up units to at least one of the at least two pump unit connections to set an operating point of the pump unit, the at least one of the hook-up units being in fluid communication with the pump unit via at least the at least one of the at least two pump unit connections and the one of the hook-up unit connections of the at least one of the hook-up units;
• providing the at least one of the hook-up units as a pneumatic resistance for the pump unit, the at least one of the hook-up units forming a resistance unit, the resistance unit comprising a nozzle structure and a pressure-dependent, automatically adjustable shut-off body, the adjustable shut-off body comprising a movable spring-mounted shut-off plate, wherein the nozzle is configured to guide gas in a direction of the movable spring-mounted shut-off plate.

A medical device comprising:

• a gas measurement device for use in medical gas measurements and/or process gas measurement applications, the gas measurement device comprising a gas flow path, the gas measurement device comprising:
• a single pump unit comprising a single pump unit housing, the pump unit housing comprising at least two connections located between one end of the pump unit housing and another end of the pump unit housing, the one end of the pump unit housing comprising a pump unit fluid inlet opening, the another end of the pump unit housing comprising a pump unit fluid outlet opening, the pump unit fluid inlet opening being axially opposite the pump unit fluid outlet opening with respect to a longitudinal axis of the single pump unit housing, the at least two connections being located between the pump unit fluid inlet and the pump unit fluid outlet, the pump unit housing comprising a pump unit housing portion extending continuously, without interruption, from one of the at least two connections to another one of the at least two connections;
• and
• a plurality of different hook-up units, each of which is connectable to the pump unit, wherein at least one of the hook-up units is connected directly to at least one of the at least two connections to set a pneumatic operating point of the pump unit, the at least one of the hook-up units being in fluid communication with the pump unit via at least one of a plurality of hook-up unit connections of the at least one of the hook-up units and the at least one of the at least two connections of the pump unit, the at least one of the hook-up unit connections of the at least one of the hook-up units and the at least one of the at least two connections of the pump unit defining at least a portion of the gas flow path, wherein the at least one of the hook-up units forms a resistance unit and presents, in a connected state with the pump unit, a pneumatic resistance for the pump unit, the at least one of the hook-up units forming a resistance unit, the resistance unit comprising a nozzle structure and a pressure-dependent, automatically adjustable shut-off body, the adjustable shut-off body comprising a movable spring-mounted shut-off plate, wherein the nozzle is configured to guide gas in a direction of the movable spring-mounted shut-off plate.