VENTILATOR AND METHOD FOR CONTROLLING A GAS SOURCE AND TWO ROTARY VALVES

Abstract

The invention relates to a ventilator comprising a gas source, at least one gas path and a patient conduit and at least two valves, each of the valves having at least indirectly a port for the surrounding air and each of the valves being at least temporarily connected to the gas source and/or the patient conduit so as to conduct gas.

Claims

1.-46. (canceled)

47. A ventilator, wherein the ventilator comprises a gas source, at least one gas line, a patient line, and at least two valves, each of the valves having at least indirectly a connection to ambient air and being arranged in the gas line or as part of the gas line.

48. The ventilator of claim 47, wherein the at least two valves are at least temporarily connected to the gas source and the patient line or the ambient air in a gas-conducting manner.

49. The ventilator of claim 47, wherein the at least two valves are fluidically connected in series in at least one switching position and in at least one part of the gas line.

50. The ventilator of claim 47, wherein one of the at least two valves (switching valve) has a switching action which is such that insufflation of a patient is provided in a first switching position and exsufflation of the patient is provided in a second switching position.

51. The ventilator of claim 47, wherein one of the at least two valves (oscillation valve) acts in such a way that a flow resistance in the gas line between blower and patient can be varied by stepwise opening and closing of the valve, as a result of which oscillations of flow and pressure are brought about during insufflation and/or exsufflation.

52. The ventilator of claim 48, wherein in a first switching position respiratory gas from the gas source is provided for an insufflation of a patient, and in a second switching position respiratory gas from the gas source is provided for an exsufflation of the patient, and wherein one of the at least two valves (oscillation valve) acts in such a way that the flow resistance in the gas line between blower and patient can be varied by opening and closing of the valve, as a result of which oscillations of flow and pressure are brought about.

53. The ventilator of claim 47, wherein at least one control unit is set up and configured to control a blower and/or a switching valve and/or an oscillation valve.

54. The ventilator of claim 47, wherein at least one of the at least two valves is a rotatably mounted valve.

55. The ventilator of claim 47, wherein at least one of the at least two valves is an axial valve.

56. The ventilator of claim 47, wherein a switching valve comprises an electrically driven motor with a stator and a valve body fastened for conjoint rotation to the rotor, the valve body being rotatably mounted about an axis of rotation, and a radial and an axial direction of the valve body being defined on the basis of the axis of rotation.

57. The ventilator of claim 47, wherein an oscillation valve comprises an electrically driven motor with a stator and a valve body fastened for conjoint rotation to the rotor, the valve body being rotatably mounted about an axis of rotation, and a radial and an axial direction of the valve body being defined on the basis of the axis of rotation.

58. The ventilator of claim 57, wherein the oscillation valve and/or the valve body has at least one opening which leads to the patient line, and a further opening which leads to the ambient air, and wherein the valve body is designed such that, depending on the valve position, it at least partially closes or opens the opening that leads to the patient line, or the opening that leads to the ambient air, for a respiratory gas flow.

59. The ventilator of claim 57, wherein the valve body of the oscillation valve has a region which represents a receptacle for a motor shaft and also has a wall region which, in a rotary position of the valve, at least partially closes or opens the opening that leads to the patient line, or the opening that leads to the ambient air, for a respiratory gas flow, and, depending on a rotary position of the valve, at least one opening of the valve thus releases a respiratory gas flow in a direction of the patient line or a gas flow in a direction of an environment.

60. The ventilator of claim 57, wherein the oscillation valve is designed as a rotatably mounted valve, and the valve body has at least one opening in the radial direction and at least one opening in the axial direction.

61. The ventilator of claim 60, wherein the at least one opening in axial direction points in the axial direction to a connection that leads to the ambient air.

62. The ventilator of claim 57, wherein the valve body of the oscillation valve has a central region which extends in a cylindrical shape in an axial direction around a receptacle for a motor shaft, and also comprises a cover disk, which extends from an upper end of the central region in a radial direction, and, on a radial outer edge or near an outer edge of the cover disk, a wall region which extends in the axial direction or at a right angle starting from the cover disk and extends substantially parallel to the central region, a channel that conducts gas extending between the wall region and the central region, and the openings being connected via a channel in a gas-conducting manner.

63. The ventilator of claim 62, wherein the cover disk has an opening which, in a rotary position of the valve, is connected to a connection to an environment in a gas-conducting manner.

64. The ventilator of claim 63, wherein a shape of the opening and/or a shape of the connection to the environment are designed such that an overlap between the opening and the connection, upon rotation of the valve, increases or decreases linearly depending on a direction of rotation.

65. A method for controlling a gas source and at least two valves of a ventilator, wherein each of the valves has at least indirectly a connection to ambient air, and wherein the valves are arranged in a gas line or as part of the gas line, wherein the at least two valves are at least temporarily connected to the gas source and a patient line or ambient air in a gas-conducting manner, and are fluidically connected in series in at least one switching position and in at least one part of the gas line.

66. A method for controlling the ventilator of claim 47, wherein the at least two valves are at least temporarily connected in a gas-conducting manner to the gas source and the patient line or the ambient air, and wherein in a first switching position respiratory gas from the gas source is provided for an insufflation of a patient, and in a second switching position respiratory gas from the gas source is provided for an exsufflation of the patient, one of the at least two valves (oscillation valve) being controlled in such a way that, by opening and closing of the valve, the flow resistance in the gas line between blower and patient can be varied, as a result of which oscillations of flow and pressure are brought about.

Description

[0085] In an advantageous embodiment of the invention, the ventilator has at least one interface which is designed and set up to transmit the content of the frequency counter, stored in the memory unit and concerning coughing events, to a data receiver or a data-receiving unit. The data transmission can be wired or wireless here. Data transmission interfaces can be, for example, an electronic data transmission bus, a network interface (e.g. LAN), a data transmission modem, a USB interface, a radio transmission interface, e.g. infrared, Bluetooth, WIFI, GSM/LTE and the like, or a removable storage medium, e.g. a memory card (flash), a USB stick/hard drive and the like. The data receiver or the data-receiving unit can be, for example, an external (remote) data processing device with an evaluation unit (e.g. evaluation software), an expert user (e.g. physician), a display device (e.g. display, monitor) and the like. The data-receiving unit can thus enable the analysis result to be found at a later time, in particular in cases where the ventilator does not have an internal evaluation unit. However, the ventilator can alternatively or additionally have an internal evaluation unit.

[0086] The ventilator 1 here alternatively offers the option of coupling one or more external device components (humidifier, nebulizer, oxygen mixer, etc.) via the interface 108 and thus functionally expanding or replacing the ventilator 1.

[0087] FIG. 2 shows: The ventilator 100 according to the invention has at least one blower 10, with a suction side 11 and a pressure side 12, and at least one control unit 4, and a gas line 13 which connects the pressure side 12 to a patient line 14 in a gas-conducting manner. The gas line 13 is connected to a switching valve 2 and an oscillation valve 3. A suction gas line 9 connects the suction side 11 of the blower to the switching valve 2.

[0088] The switching valve 2 has a connection 24 to the suction side 11 and a connection 25 to the pressure side 12, a connection 26 to the ambient air 15, and a connection 27 to the patient line 14. The oscillation valve 3 has a connection 34 to the patient line 14, a connection 35 to the switching valve 2, and a connection 36 to the ambient air 16.

[0089] The switching valve 2 and the oscillation valve 3 are arranged in series between the blower 10 and the patient line 14. For example, both valves are arranged in a common valve block. The connection 27 of the switching valve 2 is connected to the connection 35 of the oscillation valve 3 via the gas line 13, and the connection 34 is connected to the patient line 14. To this extent, the blower is indirectly connected to the patient line 14 via the switching valve 2 and the oscillation valve 3. The ventilator is set up and designed to produce an at least temporary gas flow between the environment 15 and the patient line 14, the gas flow being able to take place at least in some sections in both directions.

[0090] The at least one control unit 4 is set up and designed to control the blower 10 and/or to control the switching valve 2 and/or to control the oscillation valve 3.

[0091] The at least one control unit 4 can be arranged adjacent to the valves and the blower 10 or remote from them and connected to them via a data line. The at least one control unit 4 controls the switching states for the switching valve 2 and the oscillation valve 3, namely inhalation, exhalation and pause.

[0092] FIG. 3 shows: The switching valve 2 and the oscillation valve 3 are arranged in series in the valve block 50, shown here in the upper half, between the environment 15 and the patient line 14. The gas line 13 connects the switching valve 2 and the oscillation valve 3 and is implemented in the valve block. The switching valve 2 has a connection 24 to the suction side 11 and a connection 25 to the pressure side 12 of the blower. Another connection leads to the ambient air 15, and a connection 27 via the gas line 13 to the oscillation valve 3 and to the patient line 14. The switching valve 2 is arranged in the valve housing 29, which here is a partial region of the valve block 50, and is connected via the valve body 23 to the motor shaft 28. The switching valve 2 has an electrically driven motor with a stator and a valve body 23 fastened for conjoint rotation to the rotor. The motor has at least one winding through which current flows during operation.

[0093] The valve body 23 is mounted rotatably about an axis of rotation. A radial direction and an axial direction of the valve body 23 are defined on the basis of the axis of rotation.

[0094] Two switching means point radially outward from the valve body 23. The two switching means are designed as symmetrical valve surfaces 20. The valve housing 29 has a movement space for the switching means 20 and at least one stop 22 for the switching means. The stop is designed so that it limits the movement of the valve such that the switching means strike against the stop. The rotation is preferably limited to a range of 90-180° by two stops. Switching between inhalation and exhalation takes place using two switching states. A middle position is provided for the pause switching state.

[0095] FIG. 4 in conjunction with FIGS. 2 and 3 shows: The switching valve 2 and the oscillation valve 3 are arranged in series in the valve block 50 between the environment 15 and the patient line 14. The gas line connects the switching valve 2 and the oscillation valve 3 and is implemented in the valve block. The switching valve 2 is arranged in the valve housing, which is here a partial region of the valve block, and is connected to the motor shaft via the valve body 23. The switching valve 2 has an electrically driven motor with a stator and a valve body 23 fastened for conjoint rotation to the rotor. The motor has at least one winding through which current flows during operation. The valve body 23 is mounted rotatably about an axis of rotation. A radial direction and an axial direction of the valve body 23 are defined on the basis of the axis of rotation 60.

[0096] Two switching means point radially outward from the valve body 23. The two switching means are designed as valve surfaces. The valve housing has a movement space for the switching means 20 and at least one stop 22 for the switching means. The stop is designed so that it limits the movement of the valve, such that the switching means strike against the stop. The rotation is preferably limited to a range of 90-180° by two stops 22. Switching between inhalation and exhalation takes place using two switching states. A middle position is provided for the pause switching state.

[0097] The oscillation valve is preferably designed as a rotatably mounted valve and is arranged in the valve housing 39, which is here a partial region of the valve block 50, and is connected to the motor shaft via the valve body 33. The oscillation valve 3 has a connection to the patient line 14, a connection to the switching valve 2, and a connection 36 to the ambient air. In this embodiment, the switching means is a rotary valve body 33 with openings in two different planes and directions. The openings point both radially and axially. At least one stop 32 on the valve and or the housing limits the rotation of the valve. A rotation of more than one full turn is thus prevented.

[0098] The oscillation valve 3 has an electrically driven motor with a stator and a valve body 33 fastened for conjoint rotation to the rotor. The motor has at least one winding through which current flows during operation. The valve body 33 is mounted rotatably about an axis of rotation. A radial direction and an axial direction of the valve body 33 are defined on the basis of the axis of rotation. The oscillation valve and/or the valve body 33 has at least one opening which leads to the patient line and an opening which leads to the ambient air. The valve body 33 is designed such that, depending on the valve position, it at least partially closes or opens the opening to the patient line or the opening to the ambient air for a respiratory gas flow.

[0099] The opening in the axial direction points to the connection 36 which leads to the ambient air 16. The valve body 33 has a central region which extends in the axial direction in a cylindrical shape around the receptacle for the motor shaft. The valve body 33 also has a cover disk 37 which, starting from the upper end of the central region, extends in the radial direction 61.

[0100] The cover disk 37 is not formed continuously and leaves at least one opening free, which opening extends in the axial direction.

[0101] The shape of the opening 63 or the shape of the connection 36 is for example chosen such that, upon rotation of the valve, the overlap between the opening and the connection 36 increases or decreases linearly depending on the direction of rotation. The overlap between the opening 63 and the connection 36 can also increase non-linearly upon rotation of the valve, for example quadratically or logarithmically or discontinuously.

[0102] The shape of the opening 63 and/or the shape of the connection 36 is, for example, at least partially oval, rounded or triangular.

[0103] For inhalation, the control unit 4 specifies the position of the switching valve 2 and of the oscillation valve 3 such that a gas flow from the environment via the connections 26 and 24 to the suction side 11 of the blower is possible and, at the same time, a gas flow from the pressure side 12 via the connection 25 and 27 to the connection 35 of the oscillation valve 3 and through the connection 34 to the patient line 14. The switching valve 2 and the oscillation valve 3 are arranged in series in the valve block between the blower 10 and the patient line 14.

[0104] FIG. 5 in conjunction with FIGS. 2 and 3 shows: For exhalation, the control unit 4 specifies the position of the switching valve 2 and of the oscillation valve 3 such that a gas flow is enabled from the patient line 14 via the connection 34 and the connection 35 of the oscillation valve 3 and via the connection 27 and the connection 24 of the switching valve to the suction side 11 (P−) of the blower. The blower thus sucks in respiratory gas from the patient line. The respiratory gas flows through the valves 3 and 2 and the connection 26 and then exits to the ambient air 15. The valve body with its switching means separates the negative pressure region (P−) of the sucked in gases (arrows), which flow from the patient line 14 through the valve 3 and pass through a part of the switching valve 2 to the suction side of the blower, from the positive pressure region (P+) of the gases that are accelerated by the blower and are guided through a part of the switching valve 2 to the connection 26 and further to the ambient air 15, and leads a gas flow from the pressure side 12 to the connection 26 and further to the ambient air 15. In comparison with the position of the switching valve 2 from FIG. 4, it can be seen that for the exhalation the switching valve was moved such that the switching means pointing radially outward from the valve body 23 strike against two other stops 22 than in the inhalation position.

[0105] FIG. 6 in conjunction with FIGS. 2 and 3 shows: In comparison with the position of the switching valve 2 from FIG. 4 or FIG. 5, it can be seen that for the pause the switching valve was moved such that switching means protruding radially outward from the valve body 23 do not strike against any of the stops 22. Rather, the switching means are located in a position between two stops 22. Through this position of the switching means, a gas flow from the suction side 11 of the blower 10 to the pressure side 12 is free.

[0106] For the pause, the control unit 4 specifies the position of the switching valve 2 and of the oscillation valve 3 such that a gas flow through the connection 25 to the connection 24 is free and therefore a gas flow from the suction side 11 of the blower 10 to the pressure side 12 is free and a gas flow to the environment is at least partially suppressed or is not actively conveyed by the blower. Since a recirculation from the pressure side of the blower toward the suction side of the blower takes place in this switching position, no gas flow is enforced toward the oscillation valve or toward the patient or away from the oscillation valve or away from the patient. Rather, the switching valve is preferably designed in such a way that, in the pause switching position, it has a neutral effect with respect to the patient's respiration, and inhalation or exhalation on the part of the patient is in principle possible through the switching valve.

[0107] The oscillation valve 3 was switched such that a gas flow from or to the switching valve is not possible. A free respiration of the patient through the oscillation valve to the environment is preferably possible, since the valve was moved such that the opening 63 is connected to the connection 36 to the ambient air in a gas-conducting manner and thus a gas flow between the patient and the environment is possible.

[0108] FIG. 7 in connection with FIGS. 2-5 shows: For inhalation with oscillation, the control unit 4 specifies the position of the switching valve 2 and of the oscillation valve 3 such that a gas flow (arrows) from the environment 15 via the connections 26 and 24 to suction side 11 of the blower is possible, and at the same time a gas flow from the pressure side 12 via the connections 25 and 27 to the connection 35 of the oscillation valve 3 and through the connection 34 to the patient line 14. Moreover, the control unit 4 specifies the position of the oscillation valve 3 such that the connection 36 is alternately connected to the environment and again not connected (indicated by the double arrow). Depending on the frequency with which the position of the oscillation valve 3 specifies in this way, there are flow and pressure fluctuations (oscillations) which superpose the respiratory air flow to the patient. The alternating connection to the ambient air results in a pulsating pressure reduction, which corresponds to the frequency of the movement of the oscillation valve 3.

[0109] FIG. 8 shows in conjunction with FIGS. 2-5 and 7: For exhalation with oscillation, the control unit 4 specifies the position of the switching valve 2 and of the oscillation valve 3 such that a gas flow from the patient line 14 via the connection 34 and the connection 35 of the rotary valve 3 and via the connection 27 and the connection 24 of the switching valve to the suction side 11 of the blower (P−) is possible, and a gas flow from the pressure side 12 (P+) to the environment 15. Moreover, the control unit 4 specifies the position of the oscillation valve 3 such that the connection 36 is alternately connected to the environment and again not connected. Depending on the frequency with which the position of the oscillation valve 3 in this way specifies, there are flow and pressure fluctuations that superpose the respiratory air flow of the patient's exhalation. The alternating connection to the ambient air results in a pulsating pressure reduction which corresponds to the frequency of the movement of the oscillation valve 3.

[0110] FIG. 9 shows in conjunction with FIGS. 2-8: The valve 2, 3 according to the invention is constructed here as a common valve block 50. The gas line 13 (not shown here), which connects the pressure side 12 of the blower in a gas-conducting manner to a patient line 14, is implemented in the valve block. The gas line 13 is connected to a switching valve 2 and to an oscillation valve 3. The switching valve 2 has a connection 24 to the suction side 11 and a connection 25 to the pressure side 12 of the blower (not shown), a connection 26 to the ambient air 15, and a connection 27 to the patient line 14. The oscillation valve 3 has a connection 34 to the patient line 14, a connection 35 to the switching valve 2, and a connection 36 to the ambient air 16.

[0111] The switching valve 2 and the oscillation valve 3 are arranged in series in the valve block between the blower 10 and the patient line 14. The connection 27 of the switching valve 2 is connected to the connection 35 of the oscillation valve 3 via the gas line 13, and the connection 34 is connected to the patient line 14. To this extent, the blower is indirectly connected to the patient line 14 via the switching valve 2 and the oscillation valve 3. The valve block 50 has an upper half 51 and a lower half 52. The motor 31 of the oscillation valve is arranged in the region of the upper half 51. The motor 21 of the switching valve is arranged in the region of the lower half 52. The motors can also be arranged on one side or one half 51, 52.

[0112] Upper half 51 and lower half 52 can be screwed or latched or glued together. The realization of the valve bodies of both valves in one valve housing has, in turn, advantages as regards manufacturing costs and installation space.

[0113] FIG. 10 shows: The valve body 23 is mounted rotatably about an axis of rotation 60. A radial and an axial direction 61, 62 of the valve body 23 are defined on the basis of the axis of rotation 60. Two switching means 20 point radially outward from the valve body 23. The two switching means 20 are designed as symmetrical valve surfaces 20. The valve housing 29 has a movement space for the switching means 20 and at least one stop 22 for the switching means. The stop is designed such that it limits the movement of the valve so that the switching means strike against the stop. The rotation is preferably limited to a range of 90-180° by two stops. Switching between inhalation and exhalation takes place using two switching states. A middle position is provided for the pause switching state.

[0114] FIG. 11 shows: The oscillation valve is preferably designed as a rotatably mounted valve and is arranged in the valve housing 39, which here is a part region of the valve block 50, and is connected to the motor shaft 38 via the valve body 33. The oscillation valve 3 has a connection 34 to the patient line 14, a connection 35 to the switching valve 2, and a connection 36 to the ambient air 16. In this embodiment, the switching means is a rotary valve body 33 with openings 63, 64, 65 in two different planes and directions. The openings point both radially and axially. At least one stop 32 on the valve and/or on the housing limits the rotation of the valve. This prevents a rotation by more than one full turn.

[0115] The oscillation valve has an electrically driven motor 21 with a stator and with a valve body 33 fastened for conjoint rotation to the rotor. The motor has at least one winding through which current flows during operation.

[0116] The valve body 33 is mounted rotatably about an axis of rotation 60. A radial and an axial direction 61, 62 of the valve body 33 are defined on the basis of the axis of rotation 60.

[0117] The oscillation valve and/or the valve body 33 has at least one opening which leads to the patient line, an opening 63 which leads to the ambient air, and the valve body 33 is designed such that, depending on the valve position, it at least partially closes or opens the opening which leads to the patient line, or the opening 63 which leads to the ambient air, for a respiratory gas flow.

[0118] The oscillation valve and/or the valve body 33 has at least one opening which leads to the patient line, and a further opening which leads to the ambient air, wherein the valve body 33 is designed such that, depending on the valve position, it at least partially closes or opens the opening which leads to the patient line, or the opening which leads to the ambient air, for a respiratory gas flow.

[0119] The valve body 33 of the oscillation valve has a region 66 which represents the receptacle 38 for the motor shaft, and also a wall region 68 which, in a rotary position of the valve, at least partially closes or opens the opening which leads to the patient line, or the opening which leads to the ambient air, for a respiratory gas flow, and, according to the rotary position of the valve, at least one opening 63, 64, 65 of the valve thus enables a respiratory gas flow in the direction of the patient line or a gas flow in the direction of the environment 16.

[0120] The opening 63 in the axial direction 62 points to the connection 36 that leads to the ambient air 16. The oscillation valve and/or the valve body 33 has at least one opening 65, 64 in the radial direction 61 and at least one opening 63 in the axial direction 62. The opening 63 in the axial direction 62 points to the connection 36 that leads to the ambient air 16. The valve body 33 has a central region 66, which extends in a cylindrical shape in the axial direction 62, around the receptacle 38 for the motor shaft. The valve body also has a cover disk 37 which, starting from the upper end of the central region 66, extends in the radial direction 61. At the radial outer edge or near the outer edge of the cover disk 37, the valve body has a wall region 68 which extends in the axial direction or at a right angle from the cover disk and substantially parallel to the central region 66. Between the wall region 68 and the central region 66 there extends a channel 69 which conducts gas and extends at least between the openings 65, 64 and/or also communicates with the opening 63. The channel 69 thus has, for example, three openings 63, 64, 65 which point in the axial 62 and/or radial 61 direction. The cover disk 37 is not continuous and leaves at least one opening 63 free, which extends in the axial direction 62.

[0121] The wall region 68 is not continuous and leaves at least two openings 65, 64 free, which extend in the radial direction 61. The at least one opening 65, 64 in the radial direction 61 can also be designed as a bore through the valve body. There are then two openings 65, 64 which are connected to each other by a channel 69. Within the meaning of the invention, an opening can also be a wide-lumen region which permits a considerable gas flow. The wall region can assume any shape that is suitable for substantially preventing a gas flow. The wall region can therefore occupy an area that is smaller than the area of the opening.

[0122] The shape of the opening 63 and/or the shape of the connection 36 is chosen for example such that, upon rotation of the valve, the overlap between the opening 63 and the connection 36 increases or decreases linearly, depending on the direction of rotation. Upon rotation of the valve, the overlap between the opening and the connection 36 can also increase non-linearly, for example quadratically or logarithmically or discontinuously.

[0123] The shape of the opening 63 and/or the shape of the connection 36 is, for example, at least partially oval, rounded or triangular.

[0124] The oscillation valve permits an oscillation on the pressure signal by reducing the pressure via an opening 63 to the environment. The opening to the environment can additionally be used to relieve the patient. The opening to the environment can furthermore support or facilitate the patient's breathing in the pause switch position.

[0125] Valve settings other than those shown here can also be provided for the oscillation during insufflation and/or exsufflation.

[0126] FIG. 12 shows an example of a pressure curve as can be provided when the ventilator 1 is used. For this purpose, the pressure 301 was plotted against the time 302.

[0127] During the insufflation 304, a correspondingly high pressure 301 is present for a defined time. For particularly effective stimulation of the cough stimulus or for particularly effective release of secretion, there is then a very brief switch to exsufflation 305. For this purpose, the pressure 301 is lowered to a correspondingly negative level within a defined time span and maintained for a defined duration. According to the invention, the switchover is effected in particular also by the switching valve 2 and the blower.

[0128] Then, for example, the pressure can be increased again to the desired level for the insufflation. According to the invention, the switchover is also effected here, in particular, by the switching valve 2 and the blower. The pressure 301 is then lowered again very quickly for the exsufflation. This change between insufflation and exsufflation can be repeated for a desired period of time. For example, the number of repetitions and/or the frequency of the repetitions can be predefined by a user or care provider.

[0129] In the curve shown here, a pause 306 is provided after the exsufflation 305. This affords the patient great relief, since the coughing processes require considerable physical exertion. The pressure curve shown here has a slight overpressure or a positive therapy pressure during the pause 306. Exhaling against a slight, targeted overpressure is particularly useful in terms of respiratory therapy. The overpressure can for example be set up as a constant positive pressure (CPAP).

[0130] For example, the pressure is between 4 and 30 mbar. By contrast, a pressure in the range of approximately +/−70 mbar or even higher can be set for exsufflation and/or insufflation. During the pause, there are typically considerably smaller flows during inhalation and exhalation compared to insufflation or exsufflation.

[0131] Ventilation can also be provided during the break. For example, a pressure of up to about 50 mbar and in particular between 10-35 mbar is then provided for ventilation or inspiration.

[0132] The drop in pressure 301 at the transition from insufflation to exsufflation preferably occurs here through a correspondingly rapid switchover of the valve unit. The speed of the blower for exsufflation is preferably already adjusted accordingly before the valve unit is switched. According to the invention, however, this is not necessary.

[0133] The increase in pressure 301 from the exsufflation to the next insufflation, or after a pause to the next insufflation, is preferably less rapid or takes place over a longer period of time. In addition to the changing of the valve position, the pressure increase can be achieved by carefully starting up the blower.

[0134] The pressure 301 in preparation for the pause 306 is also increased here by a correspondingly slow increase in speed of the blower.

[0135] According to the invention, a defined oscillation can take place at the level of the inspiration 304 or that of the expiration 305 or in the switchover phase between inspiration 304 and expiration 305 or during the pause 306. The oscillation valve 3 acts in such a way that, by gradual opening and closing of this valve, the flow resistance in the gas line between the gas source and the patient can be varied such that oscillations of flow and/or pressure are caused.

[0136] FIG. 13 shows an example of a coughing maneuver with a subsequent pause 306. For this purpose, the pressure 301 was plotted against the time 302 in the upper graph. In the middle graph, a speed 307 of the blower was plotted against the time 302 by way of example and in a highly idealized manner. In the lower graph, a speed 307 of the blower was plotted against the time 302 by way of example and in a highly idealized manner. The dashed lines running vertically indicate in a highly schematic manner a switchover of the valve position. At the beginning of the maneuver, the valve unit is brought into the valve position for insufflation.

[0137] The speed 307 of the blower is then slowly increased over a defined time. The pressure 301 increases accordingly. After the pressure 301 required for the insufflation is reached, the speed 307 is maintained.

[0138] After a defined time, the change from insufflation 304 to exsufflation 305 takes place. For effective triggering of the cough stimulus or particularly effective support of the discharge of secretions, the change takes place particularly briefly here. To do this, the valve unit is switched to the second valve position. The pressure 301 drops accordingly over a very short period of time. The negative pressure required for the exsufflation 305 is reached.

[0139] To be able to allow the pressure transition at particularly short notice, the speed 307 was already increased to the required level before switching on. The pressure 301 or the speed for the exsufflation 305 are now maintained for a predetermined time.

[0140] The valve unit is then switched over again. After switching on, the speed 307 is increased to such an extent that there is a correspondingly slight overpressure suitable for ventilation during the pause 306. The blower thus accelerates during the pressure build-up or to generate the pressure curve.

[0141] After the end of the pause 306, the speed can be increased again in order to reach the pressure 301 required for the insufflation 304. The cough maneuver can now begin afresh.

[0142] Overall, the invention presented here affords the advantage of making available a particularly patient-friendly and at the same time effective coughing machine. In addition, the invention affords the advantage that considerably improved ventilation is also possible. For example, during ventilation, particularly gentle support in the discharge of secretions can take place, with the patient being supported in an exhalation phase with a negative therapy pressure. The invention can be used particularly advantageously with a two-hose system.

[0143] A further advantage is that the ventilation can be carried out alone or in combination with cough or secretion therapy. For example, during cough or secretion therapy, there is a pause during which a positive therapy pressure is used in order to relieve the patient. Ventilation of the patient can also take place in the pause.