CN116236664B - Dual Venturi air supply device and ventilator - Google Patents
Dual Venturi air supply device and ventilatorInfo
- Publication number
- CN116236664B CN116236664B CN202211656128.4A CN202211656128A CN116236664B CN 116236664 B CN116236664 B CN 116236664B CN 202211656128 A CN202211656128 A CN 202211656128A CN 116236664 B CN116236664 B CN 116236664B
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- venturi
- air supply
- inlet
- dual
- supply device
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/12—Preparation of respiratory gases or vapours by mixing different gases
- A61M16/122—Preparation of respiratory gases or vapours by mixing different gases with dilution
- A61M16/125—Diluting primary gas with ambient air
- A61M16/127—Diluting primary gas with ambient air by Venturi effect, i.e. entrainment mixers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
- A61M16/20—Valves specially adapted to medical respiratory devices
- A61M16/201—Controlled valves
- A61M16/202—Controlled valves electrically actuated
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- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Pulmonology (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Nozzles (AREA)
Abstract
本申请公开了双文丘里供气装置和呼吸机，所述双文丘里供气装置包括用于提供不同氧气浓度的射流的两个文丘里供气单元(100)，每个所述文丘里供气单元(100)包括用于喷射高压氧气的文丘里流量喷嘴(110)以及与所述文丘里流量喷嘴(110)连通的文丘里射流体(120)，所述双文丘里供气装置包括在所述文丘里流量喷嘴(110)与文丘里射流体(120)的连通处提供低压气流的供气通道以及与两个所述文丘里供气单元(100)的文丘里射流体(120)的出口均连通的输出单元(200)。本申请的双文丘里供气装置能够在更大范围调节氧气浓度，适应更多情况和不同人群。
The present application discloses a dual-Venturi air supply device and a ventilator, wherein the dual-Venturi air supply device comprises two Venturi air supply units (100) for providing jets with different oxygen concentrations, each of the Venturi air supply units (100) comprising a Venturi flow nozzle (110) for ejecting high-pressure oxygen and a Venturi jet body (120) connected to the Venturi flow nozzle (110), and the dual-Venturi air supply device comprises an air supply channel for providing a low-pressure airflow at the connection point between the Venturi flow nozzle (110) and the Venturi jet body (120), and an output unit (200) connected to the outlets of the Venturi jet bodies (120) of the two Venturi air supply units (100). The dual-Venturi air supply device of the present application can adjust the oxygen concentration over a wider range and adapt to more situations and different groups of people.
Description
Technical Field
The application relates to the field of medical equipment, in particular to a double-venturi air supply device and a breathing machine.
Background
Ventilators are commonly used medical devices that typically require different oxygen concentrations to be provided for different people and in different ventilation modes. This requirement is even more stringent for portable emergency ventilators when used outdoors and in emergency situations.
Currently, a ventilator mainly adjusts the oxygen concentration through an oxygen mixing device with a venturi structure, but the adjusting range is narrow, so that a larger range of oxygen concentration adjustment and flow adjustment can not be provided (for example, for children, the oxygen concentration needs to be reduced compared with adults and a small flow of high-pressure air flow is provided).
Therefore, how to provide a wider range of oxygen concentration adjustment becomes a technical problem to be solved by the present application.
Disclosure of Invention
In view of this, the present application proposes a dual venturi gas supply device to adjust the oxygen concentration over a wider range.
The application provides a double-venturi air supply device, which comprises two venturi air supply units for providing jet flows with different oxygen concentrations, wherein each venturi air supply unit comprises a venturi flow nozzle for jetting high-pressure oxygen and a venturi jet body communicated with the venturi flow nozzle, and the double-venturi air supply device comprises an air supply channel for providing low-pressure air flow at the communication position of the venturi flow nozzle and the venturi jet body and an output unit communicated with the outlets of the venturi jet bodies of the two venturi air supply units.
Optionally, the dual venturi air supply is arranged to controllably provide a jet to the output unit via two of the venturi air supply units, respectively.
Optionally, the dual venturi air supply device comprises air supply channels for respectively providing low-pressure air flow to the communication place of the venturi flow nozzle and the venturi jet fluid of each venturi air supply unit.
Optionally, the dual venturi air supply device comprises an air source control unit and an air path control unit, wherein the air source control unit is used for dividing high-pressure oxygen into three parts and respectively providing the three parts to a first inlet, a second inlet and a third inlet of the air path control unit, the air path control unit comprises two electromagnetic valves, two air control valves respectively controlled by the two electromagnetic valves, a mixing cavity and a fourth inlet communicated with the mixing cavity, the air of the first inlet is respectively provided to the two air control valves and is provided to the two venturi flow nozzles through the outlets of the air control valves, the second inlet is communicated with the mixing cavity to mix the air provided by the fourth inlet, the outlet of the mixing cavity is communicated with the air supply channel, and the air of the third inlet is respectively provided to the two electromagnetic valves to control the electromagnetic valves.
Optionally, a one-way valve is arranged between the outlet of the pneumatic control valve and the venturi flow nozzle.
Optionally, the gas source control unit includes a first valve seat and two proportional valves installed on the first valve seat, the first valve seat includes a first outlet and a second outlet for gas output of the two proportional valves, the first outlet and the second outlet are respectively communicated with the first inlet and the second inlet, and the first valve seat further includes a third outlet for communicating with the third inlet and an oxygen inlet for inputting high-pressure oxygen.
Optionally, a positioning structure for aligning the first, second and third outlets with the first, second and third inlets respectively in sealing relation is provided between the air source control unit and the air path control unit.
Optionally, the gas circuit control unit comprises a second valve seat for installing the electromagnetic valve and the pneumatic control valve, and the first inlet, the second inlet, the third inlet, the fourth inlet and the mixing cavity are arranged on the second valve seat.
Optionally, the jet flow rates of the two venturi flow nozzles are different, and the flow rate of the venturi jet fluid is matched with the corresponding venturi flow nozzle.
The application also provides a breathing machine, wherein the breathing machine comprises the double-venturi air supply device.
According to the technical scheme of the application, the two Venturi air supply units can provide jet flows with different oxygen concentrations, so that the oxygen concentration can be adjusted in respective ranges through each Venturi air supply unit, and the effect of adjusting the oxygen concentration can be achieved by mixing the air flows provided by the two Venturi air supply units through the output unit. Therefore, the double-venturi gas supply device can adjust the oxygen concentration in a larger range, and is suitable for more conditions and different crowds.
Additional features and advantages of the application will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a perspective view of a dual venturi air supply device according to a preferred embodiment of the present application;
FIG. 2 is a perspective view of the air supply control unit of FIG. 1;
FIG. 3 is a perspective view of the first valve seat of FIG. 2;
FIG. 4 is a perspective view of the pneumatic control unit of FIG. 1;
FIG. 5 is a perspective view of the second valve seat of FIG. 4;
FIG. 6 is a rear perspective view of FIG. 5;
Fig. 7 is a perspective view showing the internal structure of the venturi air supply unit and the output unit of fig. 1;
Fig. 8 is a perspective view of the venturi seat of fig. 7.
Detailed Description
The technical scheme of the present application will be described in detail below with reference to the accompanying drawings in combination with embodiments.
According to an aspect of the present application, there is provided a dual venturi gas supply apparatus, wherein the dual venturi gas supply apparatus includes two venturi gas supply units 100 for providing jets of different oxygen concentrations, each of the venturi gas supply units 100 includes a venturi flow nozzle 110 for injecting high-pressure oxygen and a venturi jet 120 in communication with the venturi flow nozzle 110, the dual venturi gas supply apparatus includes a gas supply passage providing a low-pressure gas flow at a communication place of the venturi flow nozzle 110 and the venturi jet 120, and an output unit 200 in communication with outlets of the venturi jet 120 of both the venturi gas supply units 100.
According to another aspect of the present application there is provided a ventilator wherein the ventilator comprises the dual venturi air supply device of the present application.
With the dual venturi air supply device and the ventilator of the present application, the two venturi air supply units 100 can supply jet streams of different oxygen concentrations, so that the oxygen concentration can be adjusted in respective ranges by each venturi air supply unit 100, and the effect of adjusting the oxygen concentration can be achieved by mixing the air flows supplied by the two venturi air supply units 100 through the output unit 200. Therefore, the double-venturi gas supply device can adjust the oxygen concentration in a larger range, and is suitable for more conditions and different crowds.
Specifically, the jet flow may be provided to the output unit 200 by providing the jet flow to the output unit 100 through any one of the venturi gas supply units 100 alone, and the jet flow may be provided to the output unit 200 through both of the venturi gas supply units 100 at the same time, so that the air flows of the two venturi gas supply units 100 are mixed through the output unit 200 and the air flow different from the oxygen concentration and flow provided by any one of the single venturi gas supply units 100 is obtained. Of course, it is also possible to always supply the jet flow to the output unit 200 through one venturi gas supply unit 100, and when it is necessary to change the oxygen concentration and flow rate, the other venturi gas supply unit 100 may be turned on to supply the jet flow to the output unit 200.
Among them, in order to have more choices in parameters such as oxygen concentration and flow rate, it is preferable to be able to selectively supply the jet flow through the two venturi gas supply units 100, respectively. In particular, the dual venturi air supply may be configured to controllably provide a jet to the output unit 200 via two of the venturi air supply units 100, respectively.
In the present application, the air supply passage provides the low pressure air flow to the communication between the venturi flow nozzle 110 and the venturi jet 120, so that the low pressure air flow is driven by the high pressure air flow ejected from the venturi flow nozzle 110 to enter the venturi jet 120 together with the high pressure air flow, so as to obtain the required oxygen concentration and flow. The low-pressure air flow can be air or a mixture of high-pressure oxygen and air.
Wherein, two venturi air supply units 100 may be adjacently disposed and communicate with each other in communication between the venturi flow nozzle 110 and the venturi jet 120, so that low pressure air flow may be supplied to both venturi air supply units 100 through the same air supply passage. Preferably, in order to provide a jet flow with accurate control of oxygen concentration and flow rate through each venturi gas supply unit 100, the dual venturi gas supply device includes gas supply channels for respectively supplying low-pressure gas flow to the communication place between the venturi flow nozzle 110 and the venturi jet 120 of each venturi gas supply unit 100, that is, separate gas supply channels are respectively provided corresponding to each venturi gas supply unit 100.
In the present application, high pressure oxygen may be provided to venturi flow nozzle 110 and a low pressure gas stream may be provided to the gas supply passage in a suitable manner.
According to one embodiment of the present application, as shown in fig. 1, 4 to 6, the dual venturi gas supply device includes a gas source control unit 300 and a gas path control unit 400, the gas source control unit 300 is configured to divide high pressure oxygen into three parts and respectively supply the high pressure oxygen to a first inlet 410, a second inlet 420 and a third inlet 430 of the gas path control unit 400, the gas path control unit 400 includes two solenoid valves 440, two gas control valves 450 respectively controlled by the two solenoid valves 440, a mixing chamber and a fourth inlet 460 in communication with the mixing chamber, gas of the first inlet 410 is respectively supplied to the two gas control valves 450 and supplied to the two venturi flow nozzles 110 through outlets of the gas control valves 450, the second inlet 420 is in communication with the mixing chamber to mix air supplied from the fourth inlet 460, outlets of the mixing chamber are in communication with the gas supply passage, and gas of the third inlet 430 is respectively supplied to the two solenoid valves 440 to control the solenoid valves 440.
In use, high pressure oxygen is divided into three parts by the gas source control unit 300 and supplied to the gas path control unit 400, respectively. Wherein a first portion of the high pressure oxygen is subdivided through the first inlet 410 into two portions that are provided to the two pneumatic valves 450, respectively, and from the outlets of the two pneumatic valves 450 to the two venturi flow nozzles 110, respectively, to be provided as a high pressure air stream to each venturi flow nozzle 110. A second portion of the high pressure oxygen enters the mixing chamber through the second inlet 420 and mixes with air from the fourth inlet 460 to obtain a mixture as a low pressure gas stream which is then provided through the gas supply passage to the venturi flow nozzle 110 where it communicates with the venturi jet 120. A third portion of the high pressure oxygen is supplied to the solenoid valve 440 through the third inlet 430 to serve as a source of control gas for the solenoid valve 440 to control the opening and closing of the solenoid valve 440.
The pneumatic valve 450 may include a pneumatic valve core 451, a valve cover 452, and an end surface seal 453, wherein gas is controlled to enter a cavity between the pneumatic valve core 451 and the valve cover 452 by the electromagnetic valve 440, and the difference in area between both ends of the pneumatic valve core 451 is used to control the opening and closing of the pneumatic valve 450.
In order to avoid the two venturi gas supply units 100 interfering with each other and affecting the control of the oxygen concentration of the output gas stream when used alone, a first check valve 460 is preferably provided between the outlet of the pneumatic control valve 450 and the venturi flow nozzle 110. Thus, high-pressure oxygen can only flow from the outlet of the air control valve 450 toward the corresponding venturi flow nozzle 110 without flowing back, avoiding interference with another venturi air supply unit 100, so that the oxygen concentration is precisely controlled.
In the present application, the gas source control unit 300 may take a suitable form to divide the high-pressure oxygen into three parts. For example, as shown in fig. 2 and 3, the gas source control unit 300 may include a first valve seat 310 and two proportional valves 320 mounted to the first valve seat 310, the first valve seat 310 including a first outlet 311 and a second outlet 312 for gas output of the two proportional valves 320, respectively, the first outlet 311 and the second outlet 312 communicating with the first inlet 410 and the second inlet 420, respectively, the first valve seat 310 further including a third outlet 313 for communicating with the third inlet 430 and an oxygen inlet 314 for inputting high-pressure oxygen. Wherein the first valve seat 310 is provided with a corresponding air passage to allow high pressure oxygen input from the oxygen inlet 314 to enter a corresponding proportional valve 320 or outlet. The first valve seat 310 may further include maintenance holes for ventilation and sealing of the first outlet 311, the second outlet 312, and the third outlet 313, respectively.
High pressure oxygen enters the first valve seat 310 from the oxygen inlet 314, one part is output through the third outlet 313 and then is supplied to the solenoid valve 440 through the third inlet 430 as a control gas, the other part is further divided into two parts and is respectively output through the two proportional valves 320, the high pressure oxygen output by one proportional valve 320 is subdivided into two parts through the first inlet 410 and then is supplied to the venturi flow nozzle 110, and the high pressure oxygen output by the other proportional valve 320 enters the mixing chamber through the second inlet 420 to mix air to obtain a low pressure air flow.
In addition, in order to ensure that three portions of the gas supplied from the gas supply control unit 300 can be accurately introduced into the respective corresponding inlets of the gas circuit control unit 400, it is preferable that a positioning structure for sealingly aligning the first, second and third outlets 311, 312 and 313 with the first, second and third inlets 410, 420 and 430, respectively, is provided between the gas supply control unit 300 and the gas circuit control unit 400. Wherein, the location structure can adopt suitable form to realize the accurate butt joint between corresponding mouthful. For example, the positioning structure may include a hollow column 330 and a sealing ring 340 connecting the first, second and third outlets 311, 312 and 313 with the first, second and third inlets 410, 420 and 430, respectively, and the outer circumference of the hollow column 330 is provided with a mounting groove for mounting the sealing ring 340.
Similarly, similar positioning structures P may be provided at the corresponding interfaces of the air path control unit 400 and the venturi air supply unit 100 to ensure that different air flows accurately enter the corresponding venturi flow nozzles 110 and air supply channels.
The gas circuit control unit 400 may take a suitable form so as to supply three portions of high pressure oxygen to respective locations. In particular, the gas circuit control unit 400 may include a second valve seat 470 for mounting the solenoid valve 440 and the pneumatic valve 450, and the first inlet 410, the second inlet 420, the third inlet 430, the fourth inlet 460, and the mixing chamber are disposed on the second valve seat 470. The second valve seat 470 has corresponding gas passages provided therein to allow the different inlet gases to enter the solenoid valve 440, the mixing chamber, and the pneumatic valve 450, respectively.
The second valve seat 470 may be provided with a first hole 471 and a second hole 472 communicating with the outlets of the two pneumatic control valves 450, respectively, to interface the two venturi flow nozzles 110, respectively. In addition, the second valve seat 470 may be provided with a third hole 473 and a fourth hole 474 communicating with the mixing chamber to respectively interface the two air supply passages. The second valve seat 470 may also be provided with a vent 475 for the solenoid valve 440.
In addition, to provide a desired gas flow rate for different people, the jet flow rates of the two venturi flow nozzles 110 may be different, and the flow rate of the venturi jet 120 matches the corresponding venturi flow nozzle 110. Specifically, as shown in fig. 7, the venturi flow nozzle 110 includes a venturi flow nozzle 110a with a larger jet flow and a venturi flow nozzle 110b with a smaller jet flow, and the venturi jet 120 includes a large flow venturi jet 120a corresponding to the venturi flow nozzle 110a with a larger jet flow and a small flow venturi jet 120b corresponding to the venturi flow nozzle 110b with a smaller jet flow. That is, different tidal volumes may be provided by the two venturi air supply units 100. For example, when a high tidal volume is desired, a jet may be provided to the output unit 200 through the venturi flow nozzle 110a and the high flow venturi jet 120a, which are relatively large jet flows, and when a low tidal volume is desired, a jet may be provided to the output unit 200 through the venturi flow nozzle 110b and the low flow venturi jet 120b, which are relatively small jet flows.
Among them, the venturi air supply unit 100 may take a suitable form, and preferably, two venturi air supply units 100 may be integrally provided. Specifically, as shown in fig. 7, the dual venturi air supply device may include a venturi valve seat 500 and a venturi valve cover 600, in which the venturi valve seat 500 is formed with holes for two venturi flow nozzles 110 and a venturi jet 120, respectively, to which the venturi air supply unit 100 is mounted. Two orifices are disposed side by side within venturi seat 500. As shown in fig. 8, the orifice extends to the surface of the venturi seat 500 to form a fifth aperture 510 and a sixth aperture 520 that interface with the first aperture 471 and the second aperture 472, respectively, of the second seat 470. The venturi valve seat 500 is further provided with seventh and eighth holes 530 and 540 communicating with two air supply passages to interface the third and fourth holes 473 and 474 of the second valve seat 470. The output unit 200 includes a header 210, and the ports of the header 210 may cover and align with the outlet ends of the two venturi fluids 120. The port of the header 210 and the outlet end of the venturi jet 120 may be sealed by a gasket 220.
Further, as shown in fig. 8, a second check valve 130 that prevents backflow from interfering with each other between the different venturi air supply units 100 may be provided between the output unit 200 and the venturi air supply unit 100. The first check valve 460 and the second check valve 130 may take the same form, and may include, for example, a check diaphragm 131.
The use of the double venturi air supply device of the present application is described below with reference to the accompanying drawings.
The high pressure oxygen enters the first valve seat 310 from the oxygen inlet 314, one part is output through the third outlet 313 and then is supplied to the electromagnetic valve 440 through the third inlet 430 as control gas to respectively control the gas path on-off of the two pneumatic control valves 450, the other part is further divided into two parts and is respectively output through the two proportional valves 320, the high pressure oxygen output by one proportional valve 320 enters through the first inlet 410 and is then divided into two parts and is respectively supplied to the two pneumatic control valves 450 and is respectively supplied to the two venturi flow nozzles 110 from the outlets of the two pneumatic control valves 450, and the high pressure oxygen output by the other proportional valve 320 enters the mixing cavity through the second inlet 420 to be mixed with the air entering from the third inlet 430 and obtain low pressure gas flow.
When it is desired to provide a high tidal volume, the solenoid valve 440 controlling the pneumatic valve 450 corresponding to the venturi flow nozzle 110a having a greater jet flow is opened and the other solenoid valve 440 is closed to allow only the outlet of the pneumatic valve 450 to provide high pressure oxygen to the venturi flow nozzle 110a having a greater jet flow, thereby obtaining a high tidal volume and a flow of oxygen having a first concentration.
When it is desired to provide a low tidal volume, the solenoid valve 440 controlling the pneumatic valve 450 corresponding to the venturi flow nozzle 110b having the smaller jet flow is opened and the other solenoid valve 440 is closed to allow only the outlet of the pneumatic valve 450 to provide high pressure oxygen to the venturi flow nozzle 110b having the smaller jet flow, thereby obtaining a low tidal volume and a gas flow having the oxygen concentration of the second concentration.
When it is desired to provide a flow of oxygen having a concentration between the first concentration and the second concentration, the two solenoid valves 440 are opened to allow the outlets of the two pneumatic control valves 450 to respectively provide high pressure oxygen to the corresponding venturi flow nozzles 110, and the two flows of oxygen are mixed at the output unit 200 to a third concentration between the first concentration and the second concentration.
The preferred embodiments of the present application have been described in detail above, but the present application is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present application within the scope of the technical concept of the present application, and all the simple modifications belong to the protection scope of the present application.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the application can be made without departing from the spirit of the application, which should also be considered as disclosed herein.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211656128.4A CN116236664B (en) | 2022-12-22 | 2022-12-22 | Dual Venturi air supply device and ventilator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211656128.4A CN116236664B (en) | 2022-12-22 | 2022-12-22 | Dual Venturi air supply device and ventilator |
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| Publication Number | Publication Date |
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| CN116236664A CN116236664A (en) | 2023-06-09 |
| CN116236664B true CN116236664B (en) | 2025-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211656128.4A Active CN116236664B (en) | 2022-12-22 | 2022-12-22 | Dual Venturi air supply device and ventilator |
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| CN (1) | CN116236664B (en) |
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| CN219354992U (en) * | 2022-12-22 | 2023-07-18 | 北京谊安医疗系统股份有限公司 | Double venturi air-oxygen mixing device and breathing machine |
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| US7578294B2 (en) * | 2005-12-02 | 2009-08-25 | Allegiance Corporation | Nasal continuous positive airway pressure device and system |
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| US20080190421A1 (en) * | 2007-02-12 | 2008-08-14 | Darryl Zitting | Venturi apparatus with incorporated flow metering device |
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| JP7179407B2 (en) * | 2019-03-13 | 2022-11-29 | マグナメド テクノロジア メディカ エスィ／アー | transport ventilator |
| CA3104791A1 (en) * | 2020-01-03 | 2021-07-03 | Aeon Research And Technology, Inc. | Gas delivery venturi devices |
| CN113467533B (en) * | 2021-07-29 | 2025-05-23 | 山东非金属材料研究所 | Method for obtaining stable wet air flow with different dew point values and special device thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109771775A (en) * | 2017-11-12 | 2019-05-21 | 北京航天长峰股份有限公司 | Anesthesia machine gas circuit venturi flow amplifying unit |
| CN219354992U (en) * | 2022-12-22 | 2023-07-18 | 北京谊安医疗系统股份有限公司 | Double venturi air-oxygen mixing device and breathing machine |
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| CN116236664A (en) | 2023-06-09 |
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