Breathing circuit device

Abstract

A breathing circuit device has a breathing gas line for forming a closed breathing system, with a cooling device with at least one cooling element for cooling a breathing gas sent through the breathing gas line. The at least one cooling element is separated from the breathing gas with a wall and the wall is a deformable wall, so that a direct contact can be established between the at least one cooling element and the deformable wall by means of a deformation of the deformable wall.

Claims

1. A breathing circuit device, comprising: a breathing gas line forming a closed breathing system, wherein a breathing bag is part of the breathing gas line, said breathing bag comprising a breathing bag interior and a partition wall, said partition wall extending within said breathing bag interior; a cooling device with at least one cooling element for cooling a breathing gas sent through the breathing gas line; and a deformable wall separating the at least one cooling element from the breathing gas, the deformable wall establishing a direct contact between the at least one cooling element and the deformable wall by a deformation of the deformable wall, said deformable wall and said partition wall defining a channel, said breathing gas exiting said breathing bag via said channel, said at least one cooling element engaging said deformable wall in an area adjacent to said channel.

2. A breathing circuit device in accordance with claim 1, further comprising: a spring, wherein said spring applies a force to said breathing bag such that a pressure on a first side of the deformable wall with the cooling element is higher than a pressure on a second side of the deformable wall, so that the deformable wall is pressed onto the cooling element based on a pressure difference between the first side and the second side.

3. A breathing circuit device in accordance with claim 1, wherein the cooling element lies directly on the area of said deformable wall adjacent to said channel.

4. A breathing circuit device in accordance with claim 2, wherein the breathing gas is directly in contact with the first side of the deformable wall.

5. A breathing circuit device in accordance with claim 1, further comprising heat insulation arranged at the cooling element on an outside.

6. A breathing circuit device in accordance with claim 1, wherein the cooling element is arranged at least partly within the breathing bag and the deformable wall separates the cooling element from the breathing gas in the breathing bag.

7. A breathing circuit device in accordance with claim 1, wherein a part of a breathing bag wall of the breathing bag forms the deformable wall, on which the cooling element directly lies.

8. A breathing circuit device in accordance with claim 1, further comprising: a container; and a liquid or gel, wherein the liquid or gel is enclosed in the container with walls of the container and at least one of said walls of the container is formed by the deformable wall and the cooling element lies on the deformable wall of the container.

9. A breathing circuit device in accordance with claim 8, wherein a hot side of the container is in thermal contact with the breathing gas and the cooling element lies on the deformable wall of the container as a cold side of the container.

10. A breathing circuit device in accordance with claim 1, wherein the deformable wall is a film and/or a two-dimensional flexible surface part and/or a fabric.

11. A breathing circuit device in accordance with claim 1, wherein the cooling element is a cooling container containing water ice or a latent heat storage means or a liquid of a sorption cooler or a zeolite cooler, which said liquid is to be evaporated.

12. A breathing circuit device in accordance with claim 1, further comprising a carbon dioxide absorber for removing carbon dioxide from the breathing gas sent through the closed breathing system.

13. A breathing circuit device in accordance with claim 1, further comprising an oxygen tank for storing oxygen and an oxygen feeding unit for introducing oxygen from the oxygen tank into the breathing gas line.

14. A breathing circuit device in accordance with claim 1, wherein the breathing gas is indirectly or directly in thermal connection with the deformable wall.

15. A breathing circuit device in accordance with claim 2, further comprising: a housing wherein the deformable wall forms an outer wall of the housing, said spring being in direct contact with said housing and said breathing bag.

16. A breathing circuit device, comprising: a breathing gas line forming a breathing system, said breathing system comprising a breathing bag, said breathing bag comprising a breathing gas inlet, a breathing gas outlet and a partition wall extending in an interior thereof; a carbon dioxide absorber connected to the breathing system; a cooling element for cooling a breathing gas sent through the breathing gas line; a deformable wall separating the at least one cooling element from the breathing gas; a breathing circuit device housing, said deformable wall and said partition wall defining a breathing gas channel, said breathing gas channel being in communication with said breathing gas inlet and said breathing gas outlet, said breathing gas entering said breathing bag via said breathing gas inlet and said breathing gas exiting said breathing bag via said breathing gas channel and said breathing gas outlet, said cooling element being arranged in direct contact with said deformable wall in an area of said deformable wall adjacent to said breathing gas channel; and a pressure means for establishing a pressure on a side of the deformable wall opposite to the cooling element that is higher than a pressure on a side of the deformable wall with the cooling element such that the deformable wall establishes direct contact with the cooling element by a deformation of the deformable wall.

17. A breathing circuit device in accordance with claim 16, wherein the breathing gas is directly in contact with the first side of the deformable wall.

18. A breathing circuit device in accordance with claim 16, further comprising heat insulation arranged at the cooling element on an outside.

19. A breathing circuit device in accordance with claim 16, wherein the deformable wall forms at least a portion of the breathing bag.

20. A breathing circuit device, comprising: a breathing gas line forming a closed breathing system, said closed breathing system comprising a breathing bag, said breathing bag comprising a deformable wall, a breathing gas inlet, a breathing gas outlet and a partition wall extending in an interior of said breathing bag, said deformable wall forming at least a portion of said breathing bag, said breathing gas outlet being located at a spaced location from said breathing gas inlet, said breathing bag being in communication with said breathing gas line, said partition wall and another portion of said breathing bag forming a first fluid flow path portion, said deformable wall and said partition wall defining a second fluid flow path portion, said breathing gas inlet being in communication with said first fluid flow path portion, said second fluid flow path portion and said breathing gas outlet to define a breathing bag fluid flow path; a housing, said breathing bag being arranged in said housing; and a cooling device with at least one cooling element for cooling a breathing gas sent through the breathing gas line, said deformable wall separating the at least one cooling element from the breathing gas, the deformable wall establishing a direct contact between the at least one cooling element and the deformable wall by a deformation of the deformable wall, said breathing gas passing through said first fluid flow path portion in a first fluid flow direction, said breathing gas passing through said second fluid flow path portion in a second fluid flow direction, said first fluid flow direction being opposite said second fluid flow direction, said breathing gas exiting said breathing bag via at least said breathing gas outlet, said at least one cooling element engaging an area of said deformable wall adjacent to said second fluid flow path portion.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the drawings:

(2) FIG. 1 is a simplified view of a breathing circuit device according to a first embodiment of the invention;

(3) FIG. 2 is a simplified view of the breathing circuit device according to a second embodiment of the invention; and

(4) FIG. 3 is a simplified view of the breathing circuit device according to a third embodiment of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(5) Referring to the drawings in particular, a breathing circuit device 1 shown in FIG. 1 makes available breathing gas or breathing air for a respirator user, not shown, of the breathing circuit device 1. The breathing circuit device 1 has a housing 18 made of plastic and/or metal. Breathing gas lines 2 are arranged as inspiration line 3 and as expiration line 4 within the housing 18. The expiration gas 20 expired by the respirator user flows through the expiration line 4 into the breathing circuit device 1 and the inspiration gas 21 flows out of the breathing circuit device 1 through the inspiration line 3 and is inspired by the respirator user. The breathing gas lines 2 form a preferably completely closed breathing system 5, so that no air is introduced into the breathing gas lines 2 from the environment of the breathing circuit device 1. The expiration gas 20 is sent to a carbon dioxide absorber 6 after it flows into the expiration line 4 according to the top part of FIG. 1. The carbon dioxide absorber 6 is designed as a breathing lime container, which contains breathing lime. Carbon dioxide is thus extracted from the expiration gas 20 in the breathing lime container containing breathing lime. The temperature of the breathing lime in the breathing lime container rises during this chemical reaction and the breathing lime also releases part of the heat to the expiration gas 20. The breathing gas 22 flowing out of the carbon dioxide absorber 6 is subsequently fed to a breathing bag 13. This breathing gas 22 fed to the breathing bag 13 is essentially freed from carbon dioxide and has a temperature, for example, in the range of 55 C. The expiration gas was thus heated from 30 C. after expiration at the respirator user to a temperature of 55 C. and has a relative humidity in the range of 100%.

(6) An oxygen tank 9 arranged within the housing 18, an oxygen feeding unit 10, designed, for example, as a valve, and an oxygen line 11 are used to feed oxygen from the oxygen tank 9 to the breathing gas in the breathing bag 13. The expiration gas 20 is thus replaced with oxygen, i.e., the oxygen content in the expiration gas 20 is increased, so that this can again be fed to the respirator user of the breathing circuit device 1 with a sufficient oxygen content.

(7) The breathing bag 13 has deformable breathing bag walls 32. A partition 24 is formed within the breathing bag 13, so that a channel 23 is formed within the breathing bag 13. Part of the breathing bag wall 32 forms an outer wall of the breathing circuit device 1 or a part of the wall of housing 18. A cooling element 8 as a part of a cooling device 7 lies on this part of the breathing bag wall 32, which part forms the housing 18. The cooling element 8 is a container filled with water ice. In addition, heat insulation 17 is attached to the cooling element 8 on the outside. Two springs 19, which are connected to both the breathing bag wall 32 and the housing 18, are arranged at the breathing bag wall 32. Springs 19 apply a weak pressing force on the breathing bag wall 32, so that the pressure of the breathing gas within the breathing bag 13 is slightly higher than the ambient pressure outside the breathing circuit device 1. Thus, a lower pressure is present outside the breathing bag 13 than within the breathing bag 13. The breathing gas 22 introduced into the breathing bag 13 flows through the channel 23 and then it flows again out of the breathing bag 13 into the inspiration line 3 after flowing through channel 23. The part of the breathing bag wall 32 on which the cooling element 8 lies forms a deformable wall 12. The deformable wall 12 has a first side 15, which is in direct contact with breathing gas 22. The deformable wall 12 has, furthermore, a second side 16, with which the cooling element 8 is in contact. The above-described pressure difference between the breathing gas 22 within the breathing bag 13 and the ambient pressure outside the breathing bag 13 causes the deformable wall 12 to be pressed onto the cooling element 8. The cooling element 8 is detachably connected to the breathing circuit device 1, especially the housing 18 of the breathing circuit device 1, by means of at least one fastening device, not shown. This at least one fastening device is designed such that different cooling elements 8 can also be attached to the breathing circuit device 1.

(8) A deformable wall 12 designed as a film thus makes it possible because of the existing pressure difference that a cooling element 8 with a different surface structure can be attached to the breathing circuit device 1 and there is a direct, large-surface contact area between the deformable wall 12 and the surface of the cooling element 8 based on the deformability of the wall 12 and on the existing pressure difference. As a result, the heat can be sent sufficiently well from the breathing gas 22 through the deformable wall 12 and to the cooling element 8 even when different cooling elements 8 with different surface structures are used. The breathing gas 22 within the breathing bag 13 is thus cooled at the deformable wall 12 and, in addition, the moisture condenses here. The humidity in the inspiration gas 21, which flows out of the breathing bag 13, can thus be reduced to physiologically tolerable values.

(9) The contact area between the deformable wall 12 and the cooling element 8 is in the range of about 600 cm.sup.2. This contact area is preferably larger than 300 cm.sup.2, 400 cm.sup.2, 600 cm.sup.2 or 800 cm.sup.2, so that sufficiently good heat transfer from the breathing gas 22 to the cooling element 8 is guaranteed even when different cooling elements 8 are used.

(10) FIG. 2 shows a second exemplary embodiment of the breathing circuit device 1. Essentially only the differences from the first exemplary embodiment according to FIG. 1 are described below. The cooling device 1 is a sorption cooler 25 designed as a zeolite cooler 26. An evaporator 27 is used as a cooling element 8. The evaporator 27 is a container containing an evaporable liquid, especially water. The evaporator 27 is connected by a vapor line 28 having a valve 29 to a sorbent container 30 designed as a zeolite container 31. Zeolite is arranged within a container in the zeolite container 31. When valve 29 is opened, the liquid in the evaporator 27 evaporates and the evaporator 27 cools as a result and can thus cool and dehumidify the breathing gas 22 in channel 23 through the deformable wall 12. The vapor formed in the evaporator 27 is sent through the vapor line 28 to the zeolite in the zeolite container 31 and is adsorbed there. Heat, which is released to the environment, is thus formed in the zeolite within the zeolite container 31. The heat insulation 17 at the evaporator 27 as a cooling element 8 prevents the heat made available by the evaporator 27 from being drawn off to a greater extent to the environment of the breathing circuit device 1 and it can thus be used essentially to cool and dehumidify the breathing gas 22 in the channel 23.

(11) FIG. 3 shows a third exemplary embodiment of the breathing circuit device 1. Essentially only the differences from the first exemplary embodiment according to FIG. 1 will be described below. The replaceable cooling element 8 is arranged within the breathing bag 13. The cooling element 8 is separated from the breathing gas 22 within the breathing bag 13 by means of the deformable wall 12 as a film. Based on the pressure difference between the breathing gas within the breathing bag 13 and the environment of the breathing bag 13, which also includes the space within the deformable wall 12 with the cooling element 8, the deformable wall 12 is pressed onto the cooling element 8. Only a small part of the surface of the cooling element 8 is arranged on the outside in the area of the housing 18, so that only a small surface of the cooling element 8 needs to be thermally insulated from the environment by the heat insulation 17. The cold made available by the cooling element 8 can be made available essentially completely for cooling and dehumidifying the breathing gas 22 within the breathing bag 13.

(12) For example, a latent heat storage means with paraffin, salt hydrate, or a cooling element 8 as part of a Peltier cooler or of a heat pump or refrigerating unit may be used as a cooling element 8, the cooling element 8 representing the evaporator of a refrigerating circuit with a compressor and a condenser in case of the heat pump or refrigerating unit.

(13) On the whole, essential advantages are associated with the breathing circuit device 1 according to the present invention. Cooling elements 8 with a different surface structure can be arranged at the breathing circuit device 1, so that different cooling elements 8 can be used with a basic breathing circuit device 1 in a flexible manner for different fields of application of the breathing circuit device 1. A breathing circuit device 1 with different cooling elements 8 can be made available for a great variety of applications with a basic breathing circuit device 1, which can be manufactured in a cost-effective manner.

(14) While specific embodiments of the invention have been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.

(15) TABLE-US-00001 APPENDIX LIST OF REFERENCE NUMBERS 1 Breathing circuit device 20 Expiration gas 2 Breathing gas line 21 Inspiration gas 3 Inspiration line 22 Breathing gas 4 Expiration line 23 Channel in breathing bag 5 Closed breathing system 24 Partition in breathing bag 6 Carbon dioxide absorber 25 Sorption cooler 7 Cooling device 26 Zeolite cooler 8 Cooling element 27 Evaporator 9 Oxygen tank 28 Vapor line 10 Oxygen feeding unit 29 Valve 11 Oxygen line 30 Sorbent container 12 Deformable wall 31 Zeolite container 13 Breathing bag 32 Breathing bag wall 15 First side of wall with cooling element 16 Second side of wall with breathing gas 17 Heat insulation 18 Housing of breathing circuit device 19 Spring