Device for filtering breathing gas

1. A device for filtering breathing gas, the device comprising:

a housing with a gas inlet and a gas outlet and having a first housing section formed between said gas inlet and said gas outlet, said first housing section having a first housing section wall surface, said housing having a second housing section completely gas-tightly separated from said first housing section inside of said housing, said second housing section having a second housing section wall surface in thermal contact with said first housing section wall surface, said second housing section having an opening on an outer side of said housing; and

a filter arranged in said first housing section.

2. A device in accordance with claim 1 , further comprising a connection line wherein said gas outlet and said opening of said second housing section are connected via said connection line.

3. A device in accordance with claim 2 , further comprising a valve with an outlet arranged in said connection line so that breathing gas flows into said second housing section through both said outlet and said opening.

4. A device in accordance with claim 1 , wherein said first housing section wall surface and said second housing section wall surface are opposite wall surfaces of a common wall.

5. A respiration system comprising:

a device for providing breathing gas, which device has an outer wall;

a filtering device comprising a housing with a gas inlet and a gas outlet and having a first housing section formed between said gas inlet and said gas outlet, said first housing section having a first housing section wall surface, said housing having a second housing section completely gas-tightly separated from said first housing section between said gas inlet and said gas outlet, said second housing section having a second housing section wall surface in thermal contact with said first housing section wall surface, said second housing section having an opening from an interior of said second housing section to an outer side of said housing and a filter arranged in said first housing section, wherein at least one outer wall of said second housing section is arranged adjacent to said outer wall of said device for providing breathing gas, which said outer wall of said device for providing breathing gas is formed in a recess, such that air flowing past in the recess at said outer wall of said device for providing breathing gas also flows along said at least one outer wall of said second housing section.

6. A respiration system in accordance with claim 5 , further comprising a connection line wherein said gas outlet and said opening of said second housing section are connected via said connection line.

7. A respiration system in accordance with claim 6 , further comprising a valve with an outlet arranged in said connection line so that breathing gas flows into said second housing section through both said outlet and said opening.

8. A respiration system in accordance with claim 5 , wherein said first housing section wall surface and said second housing section wall surface are opposite wall surfaces of a common wall.

9. A respiration system in accordance with claim 5 , wherein said second housing section is in thermal contact with said first housing section via said first housing section wall surface and said second housing section wall surface that are opposite wall surfaces of a common wall.

10. A device in accordance with claim 1 , further comprising:

a heated air device feeding heated air to said opening of said second housing section, said heated air device providing the heated air as one of heated breathing gas and heated air from a device used to provide respiratory gas.

11. A respiration system for a patient, the respiration system comprising:

an inspiration side feeding breathing gas to the patient;

an expiration side connected to said inspiration side, and removing the breathing gas from the patient;

a housing arranged in line in one of said inspiration and expiration sides, said housing having an inlet arranged to receive the breathing gas from an upstream portion of said one of said inspiration and expiration side, said housing having an outlet arranged to feed the breathing gas out from said housing and into a downstream portion of said one of said inspiration and expiration sides;

a first housing section positioned in said housing and arranged to guide the breathing gas from said inlet of said housing, through said first housing section, and then out through said outlet of said housing;

a filter arranged in said first housing section, and filtering the breathing air passing through said first housing section; and

a second housing section arranged in said housing, said housing and said second housing section together having an outer side defining an opening, said second housing section and said first housing section having a barrier completely gas-tightly separating said first housing section from said second housing section upstream of said outlet, said barrier includes a common wall of said first and second housing, said common wall having one side defining an interior space of said first housing section, said common wall having another side defining an interior space of said second housing section, said one side and said another side of said common wall being on diametrically opposite sides of said common wall.

12. A respiration system in accordance with claim 11 , further comprising:

a connection line providing a flow path between said gas outlet of said housing and opening of said housing and second housing section.

13. A respiration system in accordance with claim 12 , further comprising:

an expiration valve positioned in said connection line, said expiration valve including a valve opening and a membrane biased against said valve opening, said expiration valve being arranged to control the patients breathing, said expiration valve and said connection line being arranged to flow the breathing gas through both said expiration valve and said opening and then into said second housing section.

14. A respiration system in accordance with claim 12 , further comprising:

a heated air device feeding heated air to said connection line and arranged to heat the breathing gas flowing through the connection line;

said connection line, said heated air device and said second housing section being arranged to flow the heated breathing gas from said connection line into said second housing section.

15. A respiration system in accordance with claim 13 , further comprising:

a heated air device feeding heated air to said expiration valve and arranged to heat the breathing gas flowing through the expiration valve;

said connection line, said heated air device and said second housing section being arranged to flow the heated breathing gas from said expiration valve into said connection line and into said second housing section.

16. A respiration system in accordance with claim 12 , further comprising:

one of a respirator and anesthesia apparatus connected to one of said inspiration and expiration side of the respiration system.

17. A respiration system in accordance with claim 12 , wherein:

a respirator is connected to one of said inspiration and expiration side of the respiration system, said respirator having an outer wall, said respirator generating a heated air stream along said outer wall of said respirator;

said second housing section includes an outer wall located along the heated air stream of said respirator to cause said outer wall of said second housing section to be heated by the heated air stream.

18. A respiration system in accordance with claim 16 , wherein:

said outer wall of said respirator and said outer wall of said second housing section defines a flow path for the heated air stream of said respirator, said outer wall of said respirator and said second housing section being on diametrically opposite sides of said flow path for the heated air stream.

19. A respiration system in accordance with claim 11 , further comprising:

a respirator connected to one of said inspiration and expiration side of the respiration system, said respirator generating heated waste air;

a tube feeding the heated waste air from said respirator to said opening of said second housing section and into said second housing.