CN109481804B - Breathing machine - Google Patents

Abstract

The present invention provides a ventilator, comprising: the first air circuit comprises a first pressure air source interface and a first flow regulating device which are connected in sequence; the second gas circuit comprises a second pressure gas source interface, a second flow regulating device and a second flow sensor which are sequentially connected; the third gas circuit comprises a third pressure gas source interface; a first inspiratory branch; the second air suction branch comprises a gas compression device, and an outlet of the gas compression device is connected with the second flow regulating device and the second flow sensor; a switching device including a first interface, a second interface, and a third interface, having a first mode in which the first interface is connected to the second interface and a second mode in which the first interface is connected to the third interface; and an exhalation branch that manages the patient's exhalation gases. Thus, the mixed gas of a desired oxygen concentration can be supplied while switching between the first and second modes, and the second flow sensor is shared without depending on the central gas supply system, thereby suppressing an increase in cost.

Description

Breathing machine

Technical Field

The invention relates to the field of medical instruments, in particular to a breathing machine.

Background

Ventilators have been widely used in hospitals as medical devices to assist patients with dyspnea or to support patients who are unable to breathe spontaneously to perform mechanical ventilation. Generally, ventilators require two sources of supply air, air and oxygen, by mixing the two gases to deliver a mixture of desired oxygen concentration to the patient.

At present, in hospitals provided with a central air supply system capable of providing an air source, the air source of a respirator is almost all provided by the central air supply system; in hospitals lacking a central air supply system or when the air pressure of the central air supply system is unstable, the existing breathing machine cannot timely use the breathing machine to help patients.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a ventilator having at least two air supply modes without depending on a central air supply system.

Therefore, the invention provides a breathing machine, which comprises a first air circuit, a second air circuit and a first flow adjusting device, wherein the first air circuit comprises a first pressure air source interface and a first flow adjusting device which are sequentially connected; the second gas circuit comprises a second pressure gas source interface, a second flow regulating device and a second flow sensor which are sequentially connected; the third gas circuit comprises a third pressure gas source interface; a first inspiratory limb for delivering inspiratory gas to a patient; a second inspiration branch comprising a gas compression device, the outlet of which is connected to the second flow regulating means and a second flow sensor; a switching device including a first interface connected to the first air path, a second interface connected to the second air path and a first air suction branch, a third interface connected to the third air path and the second air suction branch, and a first mode in which the first interface is connected to the second interface and a second mode in which the first interface is connected to the third interface; and an exhalation branch that manages the patient's exhalation gases.

In the present invention, the switching device has a first mode and a second mode, and the controller controls the switching device by determining a pressure value measured by the pressure sensor in the second gas path, so that switching between the first mode and the second mode can be realized, and in the second mode, the inhalation gas is supplied to the patient via the gas compression device and the second flow sensor, so that on the one hand, a mixed gas having a desired oxygen concentration can be supplied by switching according to the supply gas source, and on the other hand, the second flow regulator can be shared, thereby suppressing an increase in cost. In addition, the ventilator can be independent of a central air supply system.

In addition, in the ventilator related to the present invention, the second air path further includes a pressure sensor for detecting a gas pressure at the second pressure gas source interface; and a controller that controls the switching device to switch the switching device between the first mode and the second mode based on a measurement value of the pressure sensor. Thus, the controller can control the switching device by judging the pressure value measured by the pressure sensor in the second gas path.

In addition, in the ventilator according to an aspect of the present invention, the switching device may include a pilot valve and a pneumatic three-way valve. In this case, the controller can conveniently switch the switching device between the first mode and the second mode by controlling the on and off of the pilot valve and the corresponding action of the pneumatic three-way valve.

In the ventilator according to the present invention, the second inhalation branch may further include a first mixing chamber that connects the third port with the third air passage and the second inhalation branch. In this case, the gas of the first gas path and the gas of the third gas path can be better mixed by the first mixing chamber, thereby providing a mixed gas having, for example, a desired oxygen concentration.

In the ventilator according to the present invention, the second inhalation branch further includes a third flow rate adjustment device connected to the outlet of the gas compression device. In this case, since the third flow rate adjustment means can control the supplied gas, a prescribed amount of inhaled gas can be supplied to the patient.

In addition, in the ventilator according to the present invention, the second inhalation branch may further include a second mixing chamber. This can further improve the mixing effect of the mixed gas passing through the second mixing chamber.

In the ventilator according to the present invention, the second inspiratory branch further includes a third flow rate adjustment device, and the third flow rate adjustment device includes a voice coil motor. Thereby, the gas flowing through the second suction branch can be regulated more accurately.

In the ventilator according to the present invention, the first inspiratory branch may further include a gas mixing device. Therefore, the gas mixing device can fully mix the gas from the first gas path and the gas from the second gas path, and improve the mixing effect of the mixed gas.

In addition, in the ventilator according to the present invention, the second inhalation branch may further include a check valve. In this case, the check valve can reduce the flow velocity reflection impact, thereby ensuring the measurement accuracy of the gas flow of the second gas path.

In the ventilator according to the present invention, the gas compression device is a turbine. In this case, since the turbine belongs to the air compression device in which the maximum static output pressure is low, it is possible to effectively suppress noise and supply a mixed gas that satisfies, for example, a desired oxygen concentration.

According to the present invention, it is possible to provide a respirator that is capable of switching between supply air sources and supplying a mixed gas having a desired oxygen concentration in a timely manner without depending on a central supply air system.

Drawings

Fig. 1 is a system block diagram showing a ventilator according to an embodiment of the present invention.

Fig. 2 is a schematic diagram showing an inhalation branch according to an embodiment of the present invention.

Fig. 3 is a schematic diagram showing a switching device according to an embodiment of the present invention.

Fig. 4 is a schematic diagram showing the suction branch according to the embodiment of the present invention in the first mode.

Fig. 5 is a schematic view showing a state of the switching device shown in fig. 4.

Fig. 6 is a schematic diagram showing the suction branch according to the embodiment of the present invention in the second mode.

Fig. 7 is a schematic diagram showing a state of the switching device shown in fig. 6.

Fig. 8 is a schematic diagram showing a1 st modification of the switching device according to the embodiment of the present invention.

Fig. 9 is a schematic diagram showing a2 nd modification of the switching device according to the embodiment of the present invention.

Description of the main reference numerals:

1 … breathing machine, 2 … patient, 10 … inspiration branch, 20 … expiration branch, 20 … controller, 11 … first gas circuit, 12 … second gas circuit, 13 … third gas circuit, 14 … switching device, 15 … first inspiration branch, 16 … second inspiration branch, 17 … driving gas circuit.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. The drawings are schematic and the ratio of the dimensions of the components and the shapes of the components may be different from the actual ones.

Fig. 1 is a system block diagram showing a ventilator 1 according to an embodiment of the present invention. As shown in fig. 1, in the present embodiment, the ventilator 1 may include an inspiratory limb 10 and an expiratory limb 20. In the ventilator 1, the inspiration branch 10 may be used to manage the inspiratory activity of the patient 2, being able to provide the patient 2 with a mixture of gases of a desired oxygen concentration. The expiratory limb 20 may be used to manage the expiratory behaviour of the patient 2, being able to receive gas exhaled by the patient 2.

In addition, the expiratory limb 20 may further include a controller 30. The controller 30 may control the action of the inspiration limb 10 and the expiration limb 20 by feedback from the inspiration limb 10 and the expiration limb 20, thereby assisting the patient 2 in performing inspiration or expiration activities.

In the present embodiment, the side closer to the patient 2 in the inhalation branch passage 10 is referred to as the "downstream side" or "downstream end", and the side farther from the patient 2 is referred to as the "upstream side" or "upstream end". As described later, the upstream side of the inhalation branch 10 is supplied with various supply gases (for example, high-pressure oxygen, high-pressure air, or ambient air), which are mixed and supplied to the patient 2 on the downstream side along the inhalation branch 10.

Fig. 2 is a schematic diagram showing the suction branch passage 10 according to the embodiment of the present invention. Fig. 3 is a schematic diagram showing the switching device 14 according to the embodiment of the present invention.

In the present embodiment, as shown in fig. 2, the suction branch 10 may include a first air passage 11, a second air passage 12, a third air passage 13, and a switching device 14. In the air suction branch 10, the first air path 11, the second air path 12 and the third air path 13 can realize the switching of different air paths and the mixing of air through the switching device 14.

In the present embodiment, the air suction branch 10 further includes a first air suction branch 15 and a second air suction branch 16, and a first mode M1 in which the first air passage 11 and the second air passage 12 are connected to the first air suction branch 15 and a second mode M2 (described later) in which the first air passage 11 and the third air passage 13 are connected to the second air suction branch 16 can be realized by the switching device 14.

In the present embodiment, as shown in fig. 2 and fig. 4 described later, the first pneumatic circuit 11 may include a first pressure air supply port 110 and a first flow rate adjusting device 111 connected in series. First pressurized gas source interface 110 may receive a first pressurized gas source, that is, first pressurized gas source interface 110 may be connected to a first pressurized gas source, whereby the first pressurized gas source is capable of supplying gas to first gas circuit 11 via first pressurized gas source interface 110. In some examples, the first pressurized gas source may be high pressure oxygen. Additionally, in some examples, the first pressurized gas source received by the first pressurized gas source interface 110 may be a bottled pressurized gas.

In addition, in the first gas path 11, gas such as high-pressure oxygen gas may be delivered to the first flow regulator 111 through the first pressure gas source 110. The first flow regulating device 111 may regulate the flow of the second pressurized air source received by the first pressurized air source interface 110. In some examples, the first flow regulating device 111 may be an electromagnetic proportional valve, but the present embodiment is not limited thereto, and for example, the first flow regulating device 111 may be a valve group consisting of on-off valves of different diameters, a valve island, or a flow control valve consisting of a motor, or the like.

In addition, the first air path 11 may further include a first flow sensor 112. The first flow sensor 112 may measure the flow rate of the gas passing through the first flow regulating device 111. In some examples, the controller 30 may also control the first flow regulator 111 based on the received flow value detected by the first flow sensor 112 to achieve precise control of the flow. In some examples, the first flow sensor 112 may be an oxygen flow sensor, but the present embodiment is not limited thereto, and the first flow sensor 112 may also be a flow sensor capable of performing the same function.

In the present embodiment, the first air passage 11 may further include a first pressure regulating device 113. The first pressure regulating device 113 may be disposed between the first pressure air supply interface 110 and the first flow regulating device 111. In the first gas circuit 11, the first pressure regulating device 113 can regulate the pressure of the first pressure gas source, thereby being able to provide gas at a desired pressure. In some examples, the first pressure regulating device 113 may be a pressure regulating valve, but the present embodiment is not limited thereto, and the first pressure regulating device 113 may also be a pressure regulating device capable of achieving the same function.

In the present embodiment, as shown in fig. 2 and 4, the second air circuit 12 may include a second pressure air source interface 120, a second flow regulating device 121 and a second flow sensor 122 connected in sequence. The second pressurized gas source interface 120 may receive a second pressurized gas source, that is, the second pressurized gas source interface 120 may be connected to the second pressurized gas source, so that the second pressurized gas source can supply gas to the second gas circuit 12 via the second pressurized gas source interface 120. In some examples, the second pressurized gas source may be high pressure air or high pressure heliox. In some examples, the second source of pressurized air received by the second source of pressurized air interface 120 may be compressed air from a central air supply system, such as a hospital's central air supply system.

In the second air path 12, a gas such as high-pressure air can be delivered to the second flow regulator 121 through the second pressure air source 120. Second flow regulator 121 may regulate the flow of the second source of pressurized gas received by second source of pressurized gas interface 120. In some examples, the second flow rate adjusting device 121 may be an electromagnetic proportional valve, but the present embodiment is not limited thereto, and for example, the second flow rate adjusting device 121 may be a valve group consisting of on-off valves of different diameters, a valve island, or a flow control valve consisting of a motor, or the like.

In addition, the second flow sensor 122 may measure the flow rate of the gas passing through the second flow adjustment device 121. In some examples, the controller 30 may also control the second flow regulating device 121 to achieve precise control of the flow rate based on the received flow value detected by the second flow sensor 122. In some examples, the second flow sensor 122 may be an air flow sensor, but the present embodiment is not limited thereto, and the second flow sensor 122 may also be a flow sensor capable of performing the same function.

In addition, in some examples, from the viewpoint of ensuring the oxygen concentration of the gas delivered to the patient 2, in the first mode M1, the difference between the volume of the passage of the first flow sensor 112 to the gas mixing device 150 (described later) and the volume of the passage of the second flow sensor 122 to the gas mixing device 150 does not exceed, for example, 40mL, and the internal volume when the switching device 14 is switched to the first mode M1 does not exceed, for example, 30 mL.

As shown in fig. 4, second pneumatic circuit 12 further includes a pressure sensor 123 for detecting the pressure of the gas at second pressure source interface 120. That is, in the second pneumatic circuit 12, the pressure sensor 123 may measure the pressure of the second pressurized air source received by the second pressurized air source interface 120. In addition, pressure information (measurement value) obtained by the pressure sensor 123 can be transmitted to the controller 30. Thus, the controller 30 can control the switching device 14 based on the measurement value of the pressure sensor 123 to switch the switching device 14 between the first mode M1 and the second mode M2. Additionally, the pressure sensor 123 may be a pressure switch.

In the present embodiment, the second gas passage 12 may further include a second pressure regulating device 124. In addition, a second pressure regulating device 124 may be provided between the pressure sensor 123 and the second flow rate regulating device 121. The second pressure regulating device 124 may regulate the pressure of the second pressurized air source received by the second pressurized air source interface 120. In some examples, the second pressure regulating device 124 may be a pressure regulating valve, but the present embodiment is not limited thereto, and the second pressure regulating device 124 may also be a pressure regulating device that achieves the same function.

In this embodiment, third pneumatic circuit 13 may include a third pressure air supply interface 130. The third pressurized gas source interface 130 may receive a third pressurized gas source, that is, the third pressurized gas source interface 130 may be connected to the third pressurized gas source, so that the third pressurized gas source can supply gas to the third gas path 13 via the third pressurized gas source interface 130. In some examples, the third pressurized air source may be ambient air. For example, the ambient air may be ambient air of a hospital.

In addition, as shown in fig. 6 described later, the third air path 13 may be further provided with a filtering device 131. The filter device 131 may filter the third pressurized air source, such as ambient air, received by the third pressurized air source interface 130. By means of the filter device 131, air can be generated which complies with the prescribed standards, for example with the standards of medical hygiene. In some examples, the filtering device 131 may be a high efficiency air filter (HEPA).

In this embodiment, if the pressure of the first pressurized air source supplied to the first pressurized air source interface 110 is P1 (first pressure), the pressure of the second pressurized air source supplied to the second pressurized air source interface 120 is P2 (second pressure), and the pressure of the third pressurized air source supplied to the third pressurized air source interface 130 is P3 (second pressure), the pressure P1 may be greater than the pressure P3, and the pressure P2 may be greater than the pressure P3.

In the present embodiment, a gas having a gas pressure P1 or a gas pressure P2 is regarded as a high-pressure gas. Preferably, the gas pressure P1 or P2 is in the range of 280kPa to 650 kPa. In addition, a gas having a pressure P3 is considered to be a non-high pressure gas.

In addition, in the case where the second pressure air supply port 120 is connected to the central air supply system, the second pressure (the air pressure P2) may change with the pressure change of the central air supply system. In the ventilator 1 according to the present embodiment, when the switching device 14 is in the first mode M1 and the air pressure P2 is lower than a predetermined value, the controller 30 can control the switching device 14 so as to switch from the first mode M1 to the second mode M2 (described later).

In this embodiment, first inspiratory branch 15 may deliver an inspiratory gas (e.g., an oxygen-containing gas mixture) to the patient. In a case where the switching device 14 is in the first mode M1 (described later), the first airway 11 and the second airway 12 are connected (communicated) with the first inspiratory branch 15, and in this case, the gas of the first airway 11 and the gas of the second airway 12 enter the first inspiratory branch 15 to be mixed and supplied to the patient 2.

Additionally, the first inspiratory leg 15 can include a gas mixing device 150. In this case, it is possible to further mix the gas (first pressure gas source) from the first gas path 11 with the gas (second pressure gas source) from the second gas path 12 and obtain a mixed gas having an improved mixing effect.

In this embodiment, the second inspiratory branch 16 can deliver an inspiratory gas (e.g., a gas mixture containing oxygen) to the patient. In the case where the switching device 14 is in the second mode M2 (described later), the first pneumatic circuit 11 and the third pneumatic circuit 13 are connected (communicated) with the second inhalation branch 16, and in this case, the gas of the first pneumatic circuit 11 and the gas of the third pneumatic circuit 12 enter the second inhalation branch 16 to be mixed and supplied to the patient 2 (described later).

In this embodiment, the second suction branch 16 may further comprise a gas compression device 160 (see fig. 6). The gas compression device 160 is capable of compressing and pressurizing the gas flowing through the second suction branch 16. The maximum static discharge pressure of the gas compression device 160 may be less than 210cmH20(1cmH20 — 0.098 kPa). Preferably, the maximum static output pressure of the gas compression device 160 is less than 140cmH20, which may result in a quieter, lower power consumption, smaller size, and lighter weight ventilator. In some examples, the gas compression device 160 may be a gas compression device with a lower maximum static output pressure, but the embodiment is not limited thereto, and the gas compression device 160 may also be other devices that perform the same function, such as a small compressor. Further, the gas compression apparatus 160 is preferably a turbine, and in this case, since the turbine belongs to an air compression device in which the maximum static output pressure is low, it is possible to effectively suppress noise and to provide a mixed gas that satisfies, for example, a desired oxygen concentration.

In addition, as shown in fig. 2 and 6, an outlet of the gas compression apparatus 160 is connected to the second flow rate adjustment device 121 and the second flow rate sensor 122. Specifically, the outlet of the gas compression device 160 is connected to the second flow regulating device 121, and the outlet of the gas compression device 160 is connected to the second flow sensor 122. Thus, when the gas flows into the second gas path 12, the gas passing through the gas compression device 160 can be controlled by the second flow regulator 121 of the second gas path 12, and the gas passing through the gas compression device 160 can flow through the second flow sensor 122 and be supplied to the patient 2.

In the present embodiment, the second air intake branch 16 may further include a third flow rate adjusting device 161. The third flow regulating device 161 may control the flow of gas through the second inspiratory branch 16. In some examples, the third flow regulating device 161 may include a voice coil motor, thereby enabling more precise control of the flow of gas through the second inspiratory branch 16. Further, in some examples, the third flow rate adjusting device 161 may be a flow rate control valve composed of a motor, but the present embodiment is not limited thereto, and for example, the third flow rate adjusting device 161 may also be a valve group composed of on-off valves with different paths, a valve island, an electromagnetic proportional valve, or the like.

In addition, the second suction branch 16 may further include a first mixing chamber 162. In the second mode M2, the switching device 14 may connect (communicate) the first air passage 11 and the third air passage 13 with the second suction branch 16 through the first mixing chamber 162. That is, the gas supplied from the first gas path 11 and the gas supplied from the third gas path 13 are mixed in the first mixing chamber 162, whereby a mixed gas having an improved mixing effect can be obtained, thereby providing the mixed gas of a desired oxygen concentration to the patient 2. In some examples, when the gas supplied to the first gas path 11 is oxygen, the first mixing chamber 162 may be an oxygen mixing chamber.

In addition, the second suction branch 16 may further include a second mixing chamber 163. In some examples, the second mixing chamber 163 is configured to mix the mixed gas in the second mode M2 and pressurized by the gas compression device 160 during inspiration. This can further improve the mixing effect of the mixed gas. In some examples, when the gas supplied to the first gas path 11 is oxygen, the second mixing chamber 163 may be an oxygen mixing chamber.

In addition, the second inspiration branch 16 may further comprise a one-way valve (also referred to as check valve) 165 arranged before the second flow sensor 122. In the direction along the upstream side to the downstream side of the second suction branch 16, the check valve 165 is turned on; in the downstream-to-upstream direction along the second suction branch 16, the check valve 165 is closed. Particularly, in the case of the first mode M1, the check valve 165 may effectively isolate the second air path 12 from the second air suction branch 16, and reduce the volume of the cavity of the second air path 12, so that the impedance and the capacitance of the second air path 12 are matched with those of the first air path 11, and the flow rate reflection impact of the gas of the first air path 11 on the second air path 12 may be reduced, thereby ensuring the measurement accuracy of the second air path 12.

Hereinafter, the switching device and the switching mode thereof will be described in detail with reference to fig. 4 to 7. Fig. 4 is a schematic diagram showing the suction branch according to the embodiment of the present invention in the first mode. Fig. 5 is a schematic view showing a state of the switching device shown in fig. 4. Fig. 6 is a schematic diagram showing the suction branch according to the embodiment of the present invention in the second mode. Fig. 7 is a schematic view showing a state of the switching device shown in fig. 6.

As shown in fig. 4 and 6, the switching device 14 has a first mode M1 (see fig. 4) connecting the first and second air passages 11 and 12 with the first inhalation branch 15, and a second mode M2 (see fig. 6) connecting the first and third air passages 11 and 13 with the second inhalation branch 16.

Specifically, the switching device 14 includes a first port a connected to the first air passage 11, a second port B connected to the second air passage 12 and the first air intake branch passage 15, and a third port C connected to the third air passage 13 and the second air intake branch passage 16, and has a first mode M1 for connecting the first port a to the second port B and a second mode M2 for connecting the first port B to the third port C.

In some examples, the controller 30 may control the switching device 14 based on a measurement value of the pressure sensor 123 provided at the second pneumatic circuit 12, thereby switching the switching device 14 between the first mode M1 and the second mode M2.

Specifically, the controller 30 may control the switching device 14 to be in the first mode M1 (see fig. 4) under some conditions (for example, under the condition that the measured value of the pressure sensor 123 is in the normal range) based on the measured value of the pressure sensor 123, when the first interface a is connected with the second interface B, that is, the first air path 11 and the second air path 12 are communicated with the first inhalation branch 15, and the supply gas is conveyed to the first inhalation branch 15 along the first air path 11 and the second air path 12 (in the direction of the straight arrow shown in fig. 4) and provided to the patient 2, so that the patient 2 can obtain the mixed gas with, for example, the required oxygen concentration.

In addition, the controller 30 may control the switching device 14 to be in the second mode M2 (see fig. 6) under other conditions (for example, the measured value of the pressure sensor 123 is out of the normal range) based on the measured value of the pressure sensor 123, when the first interface a is connected with the third interface C, that is, the first air path 11 and the third air path 13 are communicated with the second inhalation branch 16, and the supply gas is conveyed to the second inhalation branch 16 along the first air path 11 and the third air path 13 (in the direction of the straight arrow shown in fig. 6) and is provided to the patient 2, so that the patient 2 can obtain the mixed gas with, for example, the required oxygen concentration.

Referring back to fig. 3, in the present embodiment, the switching device 14 may include a pilot valve 141 and a pneumatic three-way valve 142. In addition, the pilot valve 141 may be controlled by the controller 30. The pilot valve 141 is connected to the pneumatic three-way valve 142, and different connection paths of the pneumatic three-way valve 142 can be pneumatically realized by controlling the pilot valve 141.

Specifically, the pilot valve 141 has a connection end E, F, wherein the connection end E can communicate with the first air passage 11 via the driving air passage 17; the connection end F is connected to the pneumatic three-way valve 142 for driving the pneumatic three-way valve 142. In addition, the pneumatic three-way valve 142 includes an inlet port a and two outlet ports B, C. The inlet end a of the pneumatic three-way valve 142 may be connected to the first air path 11, the outlet end B may be connected to the second air path 12 and the first air suction branch 15, and the outlet end C may be connected to the third air path 13 and the second air suction branch 16. In addition, the present embodiment is not limited thereto, for example, the inlet end a of the pneumatic three-way valve 142 may be connected to the first airway 11, the outlet end B may be connected to the third airway 13 and the second inhalation branch 16, and the outlet end C may be connected to the second airway 12 and the first inhalation branch 15. In this case as well, the switching of the switching device 14 between the first mode M1 and the second mode M2 can be realized.

As shown in fig. 4, the driving air path 17 may be a manifold of the first air path 11 and supplied with air from the first air path 11. In the present embodiment, the driving gas path 17 is not limited to the gas supplied from the first gas path 11, and may be supplied from the second gas path 12 or may be supplied from a separate gas path.

Additionally, in some examples, pilot valve 141 is a solenoid valve, for example, which may be turned on or off by controller 30. After the pilot valve 141 is turned on, the pressure-regulated first pressure air source from the first air path 11 drives the pneumatic three-way valve 142 via the driving air path 17, so that the first interface a of the switching device 14 is connected with the second interface B, that is, the first air path 11 and the second air path 12 are connected (communicated) with the first air suction branch 15, and therefore the air of the first air path 11 and the air of the second air path 12 are merged to enter the first air suction branch 15. At this time, the switching device 14 is in the first mode M1 (see fig. 4). In addition, after the pilot valve 141 is closed, the driving air passage 17 is disconnected from the pneumatic three-way valve 142, and the pneumatic three-way valve 142 makes the first air passage 11 and the third air passage 13 connected (communicated) with the second air suction branch 16 under the action of the spring force, that is, the gas of the first air passage 11 and the gas of the third air passage 13 join and enter the second air suction branch 16. At this time, the switching device 14 is in the second mode M2 (see fig. 6).

As described above, in the present embodiment, the controller 30 can control the switching device 14 based on the measurement value of the pressure sensor 123 such that the switching device 14 can switch between the first mode M1 connecting the first air path 11 with the second air path 12 and the first suction branch 15 and the second mode M2 connecting the first air path 11 with the third air path 13 and the second suction branch 16, thereby being capable of switching according to the supply air source and timely supplying the mixed gas of, for example, a desired oxygen concentration.

In some examples, when the controller 30 detects that the value measured by the pressure sensor 123 satisfies a predetermined value (e.g., the pressure value is greater than 200kPa), when the controller 30 turns on the pilot valve 141, the gas driving the gas path 17 directly pushes, for example, an internal spring of the pneumatic three-way valve 142, so that the inlet end a of the pneumatic three-way valve 142 communicates with the outlet end B, and thus the switching device 14 is in the first mode M1 (see fig. 4) in which the first gas path 11 and the second gas path 12 are connected (communicated) with the first gas suction branch 15. In other examples, when the controller 30 detects that the value measured by the pressure sensor 123 does not satisfy a predetermined value (for example, the pressure value is less than or equal to 200kPa), the controller 30 closes the pilot valve 141, at which time the gas of the driving gas path 17 is disconnected from the pneumatic three-way valve 142, and the internal spring of the pneumatic three-way valve 142 is restored to its original state, so that the inlet end a of the pneumatic three-way valve 142 is communicated with the outlet end C, thereby placing the switching device 14 in the second mode M2 (see fig. 6) in which the first gas path 11 is connected to the third gas path 13 and the second suction branch 16. Therefore, the mixed gas with the required oxygen concentration can be provided in time by switching according to the supply gas source.

In particular, when the switching device 14 of the inhalation branch 10A is in the first mode M1, the first port a of the switching device 14 is connected with the second port B, and the first air passage 11 and the second air passage 12 are communicated with the first inhalation branch 15. Furthermore, the one-way valve 165 is closed, thereby preventing gas from the second gas circuit 12 from entering the airway of the second inspiratory branch 16, and the supply gas is supplied to the patient 2 via the first gas circuit 11 and the second gas circuit 12 merging into the first inspiratory branch 15. When the switching device 14 is in the second mode M2, the first port a of the switching device 14 is communicated with the third port C, that is, the first air passage 11 is connected with the third air passage 13 and the second air suction branch 16, the check valve 165 is opened, and the second flow rate adjusting device 121 is closed. In this case, the gas of the first gas circuit 11 and the gas of the third gas circuit 13 merge into the second inspiration limb 16 and are supplied to the patient 2 at least via the gas compression device 160 of the second inspiration limb 16 and the second flow sensor 122 of the second gas circuit 12 in sequence. In this case, the second flow sensor 122 can be shared by the second air intake branch 16 and the second air passage 12, and thus an increase in cost can be effectively suppressed. In addition, the system does not depend on a central air supply system.

Further, the switching device 14 of the present embodiment is not limited to the above-described example, and a modification of the switching device 14 of the present embodiment is described below with reference to fig. 8 and 9.

Fig. 8 is a schematic diagram showing a1 st modification of the switching device according to the embodiment of the present invention. As shown in fig. 8, the switching device 14 may be an electromagnetic three-way valve 14A instead of the pilot valve 141 and the pneumatic three-way valve 142 described above. In this case, by directly controlling the electromagnetic three-way valve 14A by the controller 30, it is also possible to achieve communication of the intake end a1 of the electromagnetic three-way valve 14A with the outlet end B1 or the outlet end C1, thereby achieving switching of the switching device 14 between the first mode M1 and the second mode M2. In addition, the use of the three-way solenoid valve 14A also omits the drive gas passage 17 of the present embodiment.

Fig. 9 is a schematic diagram showing a2 nd modification of the switching device according to the embodiment of the present invention. As shown in fig. 9, the switching device 14 may be a motor-driven three-way valve 14B instead of the above-described pilot valve 141 and the pneumatic three-way valve 142. That is, the switching device 14 may be a three-way valve controlled by a motor. In this case, by directly controlling the motor-driven three-way valve 14B by the controller 30, it is also possible to achieve communication of the air inlet end a2 of the motor-driven three-way valve 14B with the air outlet end B2 or the air outlet end C2, thereby achieving switching of the switching device 14 between the first mode M1 and the second mode M2. In addition, the use of the motor-driven three-way valve 14B also omits the drive gas passage 17 of the present embodiment.

While the present invention has been described in detail in connection with the drawings and the examples, it should be understood that the above description is not intended to limit the present invention in any way. Those skilled in the art can make modifications and variations to the present invention as needed without departing from the true spirit and scope of the invention, and such modifications and variations are within the scope of the invention.

Claims (9)

1. A ventilator, characterized by:

the method comprises the following steps:

the first air circuit comprises a first pressure air source interface and a first flow regulating device which are connected in sequence;

the second gas circuit comprises a second pressure gas source interface, a second flow regulating device and a second flow sensor which are sequentially connected;

the third gas circuit comprises a third pressure gas source interface;

a first inspiratory limb for delivering inspiratory gas to a patient;

a second inspiration branch comprising a gas compression device, the outlet of which is connected to the second flow regulating means and a second flow sensor; the second air suction branch also comprises a one-way valve arranged in front of the second flow sensor;

a switching device, which comprises a first interface connected with the first air path, a second interface connected with the second air path and a first air suction branch, a third interface connected with the third air path and the second air suction branch, a first mode connecting the first interface and the second interface to realize the connection of the first air path and the second air path with the first air suction branch, and a second mode connecting the first interface and the third interface to realize the connection of the first air path and the third air path with the second air suction branch; the second flow sensor is shared in a first mode and the second mode; and in the first mode, the second flow sensor is used for detecting the gas flow of the second gas path; in the second mode, the second flow sensor is used for detecting the flow of the mixed gas of the first gas path and the third gas path; and

an expiratory limb that manages the patient's expired gas.

2. The ventilator of claim 1, wherein:

the second gas circuit also comprises a pressure sensor for detecting the gas pressure at the second pressure gas source interface; and

a controller that controls the switching device to switch the switching device between the first mode and the second mode based on a measurement value of the pressure sensor.

3. A ventilator according to claim 1 or 2, characterized in that:

the switching device comprises a pilot valve and a pneumatic three-way valve.

4. The ventilator of claim 1, wherein:

the second air suction branch also comprises a first mixing cavity, and the third interface is connected with the third air path and the second air suction branch through the first mixing cavity.

5. The ventilator of claim 1, wherein:

the second suction branch further comprises a third flow regulating device connected with the outlet of the gas compression device.

6. A ventilator according to claim 1, characterized in that:

the second suction branch further comprises a second mixing chamber arranged after the gas compression device.

7. The ventilator of claim 5, wherein:

the third flow regulating device includes a voice coil motor.

8. The ventilator of claim 1, wherein:

the first gas suction branch also comprises a gas mixing device.

9. The ventilator of claim 1, wherein:

the gas compression device is a turbine.

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