Gas circuit and breathing machine

Abstract

The utility model belongs to the technical field of breathing machines, and particularly relates to a gas circuit and a breathing machine, which comprise a breathing valve, a first one-way valve, a control valve, a gas inlet pipeline and a gas outlet pipeline, the air inlet pipeline and the air outlet pipeline are mutually independent; the air inlet end of the air inlet pipeline is communicated with an air source, the air outlet end of the air outlet pipeline is communicated with the atmosphere, and the air outlet end of the air inlet pipeline and the air inlet end of the air outlet pipeline intersect at the patient end. The first one-way valve is arranged on the air inlet path and used for allowing air to enter the patient end in a one-way mode. The breather valve is arranged on the air outlet pipeline; the control valve is connected with the breather valve to control the breather valve to act; the control valve is an electric valve. According to the gas circuit and the breathing machine, the gas inlet gas circuit and the gas outlet gas circuit are mutually independent, the gas inlet gas circuit only supplies gas, the gas outlet gas circuit only discharges gas, inhaled gas and exhaled gas do not interfere with each other, and the ventilation effect is better; opening and closing of the breather valve are controlled by the control valve, the electric control valve has the effects of quicker action and flexible opening and closing compared with a pneumatic control valve, and the ventilation efficiency is higher.

Description

Technical Field

[0001] The utility model belongs to the technical field of ventilators, and in particular relates to an air circuit and a ventilator. Background Art

[0002] Reference Figure 3 Currently, most ventilators use a single-pipeline gas circuit, with only one pipeline from the ventilator to the patient end. The breathing valve is set between the inhalation port and the patient end, close to the patient end, and is controlled by a pneumatically controlled control valve.

[0003] Existing single-circuit ventilators use the same circuit for inhalation and exhalation, and it is possible that the exhaled waste gas is not completely discharged from the circuit and reenters the patient end with the inhaled air, resulting in low ventilation efficiency and poor oxygen supply effect. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing single-tube ventilator has the problem of low ventilation efficiency, and provides an air circuit and a ventilator.

[0005] In order to solve the above technical problems, the embodiment of the utility model provides a gas circuit, including a breathing valve, a first one-way valve, a control valve, an air inlet pipeline and an air outlet pipeline;

[0006] The air inlet pipeline and the air outlet pipeline are independent of each other;

[0007] The air inlet end of the air inlet pipeline is used to connect to the air source, the air outlet end of the air outlet pipeline is used to connect to the atmosphere, the air outlet end of the air inlet pipeline and the air inlet end of the air outlet pipeline meet at a breathing interface, and the breathing interface is used to connect to the patient end;

[0008] The first one-way valve is arranged on the air inlet line, and the flow direction of the first one-way valve is from the air inlet end of the air inlet line to the air outlet end of the air inlet line;

[0009] The breathing valve is arranged on the air outlet pipeline, and the control valve is connected to the breathing valve to control the opening and closing of the breathing valve.

[0010] Optionally, the control valve is an electric valve.

[0011] Optionally, the air intake pipeline includes a mixing chamber, an oxygen branch and an air branch;

[0012] The gas source includes an oxygen source and an air source. The air inlet end of the oxygen branch is connected to the oxygen source, the air inlet end of the air branch is used to connect to the air source, the air outlet end of the oxygen branch and the air outlet end of the air branch meet in the mixing chamber, and the mixing chamber is connected to the breathing interface.

[0013] Optionally, the oxygen branch includes an oxygen filter, an oxygen pressure sensor, a pressure relief valve, an intake check valve, a pressure reducing valve, a proportional valve, a filter, a flow sensor and a second check valve which are sequentially connected along the intake direction; the flow direction of the second check valve is from the intake end of the oxygen branch to the mixing chamber;

[0014] The oxygen filter is connected to an oxygen source, and the second one-way valve is connected to the mixing chamber.

[0015] Optionally, the air branch comprises a filter element, a flow meter, a noise reduction box and a turbine fan which are sequentially connected along the air intake direction;

[0016] The air inlet end of the flow meter is connected to an air source, and the air outlet end of the turbine fan is connected to the mixing chamber.

[0017] Optionally, the air intake pipeline further includes a temperature sensor, a mixed flow sensor, a free breathing valve, an oxygen concentration sensor, a safety valve and a check valve which are sequentially arranged along the air intake direction between the mixing chamber and the breathing interface;

[0018] The temperature sensor is used to monitor the gas temperature at the gas outlet end of the mixing chamber;

[0019] The oxygen concentration sensor is used to monitor the oxygen concentration at the air outlet of the mixing chamber;

[0020] The air outlet end of the free breathing valve is connected to the atmosphere, and the air inlet end of the safety valve is connected to the mixing chamber;

[0021] The check valve is a three-way valve, one interface of the check valve is connected to the breathing interface, one interface of the check valve is connected to the atmosphere, and one interface of the check valve is connected to an external monitoring device.

[0022] Optionally, the air intake pipeline further includes an air intake resistance, and the air intake resistance is connected in parallel to the first one-way valve.

[0023] Optionally, the air intake pipeline further includes an air intake pressure sensor, and the air intake pressure sensor is connected to an interface of the calibration valve for connecting to an external monitoring device.

[0024] Optionally, the air outlet pipeline includes an expiratory air resistance, a pressure difference sensor, an expiratory pressure sensor and a zeroing valve;

[0025] The air inlet end of the exhalation air resistance is connected to the breathing interface, and the air outlet end of the exhalation air resistance is connected to the breathing valve;

[0026] The exhalation pressure sensor is connected in parallel to the exhalation air resistance, and two zeroing valves are provided, and the two zeroing valves are respectively provided at the air inlet end and the air outlet end of the exhalation pressure sensor.

[0027] The utility model also provides a respirator, comprising a respirator body and the above-mentioned gas circuit, wherein the gas circuit is arranged in the respirator body, and the respiration valve is fixed on the shell of the respirator body.

[0028] According to the air circuit and ventilator of the embodiment of the utility model, the air inlet air circuit and the air outlet air circuit are independent of each other. The air inlet air circuit only supplies air, and the air outlet air circuit only exhausts air. Inhalation and exhalation do not interfere with each other, and the ventilation effect is better. Moreover, the opening and closing of the breathing valve is controlled by the control valve. Compared with the pneumatic control valve, the electric control valve has the effects of faster action and flexible opening and closing. The control of the ventilation cycle is more precise, so the ventilation efficiency is also higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is an overall schematic diagram of the gas circuit provided by the first embodiment of the utility model;

[0030] Figure 2 It is a structural schematic diagram of the air inlet and outlet paths of the ventilator provided by the first embodiment of the utility model;

[0031] Figure 3 It is a structural diagram of the background technology.

[0032] The reference numerals in the specification are as follows:

[0033] 1. High-pressure oxygen source; 2. Oxygen filter; 3. Oxygen pressure sensor; 4. Pressure relief valve; 5. Inlet check valve; 6. Pressure reducing valve; 7. Proportional valve; 8. Filter; 9. Flow sensor; 10. Second check valve; 11. Filter element; 12. Noise reduction box; 13. Turbine fan; 14. Mixing chamber; 15. Temperature sensor; 16. Mixed flow sensor; 17. Free breathing valve; 18. Oxygen concentration sensor; 19. Safety valve; 20. First check valve; 21. Calibration valve; 22. Inhalation end pressure sensor; 23. Inlet air resistance; 24. Exhalation air resistance; 25. Pressure difference sensor; 26. Zeroing valve; 27. Exhalation valve; 28. Control valve; 29. ​​Exhalation pressure sensor; 4. The main body of the ventilator. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0035] First embodiment

[0036] like Figure 1As shown, the air circuit provided by the first embodiment of the utility model includes a breathing valve 27, a control valve 28, an air inlet pipeline and an air outlet pipeline. The air inlet pipeline and the air outlet pipeline are independent of each other. The air inlet end of the air inlet pipeline is connected to the air source, and the air outlet end of the air outlet pipeline is connected to the atmosphere. The air outlet end of the air inlet pipeline and the air inlet end of the air outlet pipeline meet at a breathing interface, and the breathing interface can be connected to equipment such as a breathing mask for connecting to the patient end. The breathing valve 27 is arranged on the air outlet pipeline, and the control valve 28 is connected to the breathing valve 27 to control the action of the breathing valve 27. The control valve 28 is an electric valve. The first one-way valve 20 is arranged on the air inlet path, and the first one-way valve 20 prevents the exhaled waste gas from entering the air inlet pipeline; in this embodiment, the air inlet path only supplies air, and when the patient inhales the gas in the air inlet path and exhales, the exhaled waste gas is transported to the air outlet path, and the air outlet path and the air supply path are independent of each other, and the inhalation and exhalation do not interfere with each other, so the ventilation effect is better, and the opening and closing of the breathing valve 27 is controlled by the control valve 28. Compared with the pneumatic control valve 28, the electric control valve 28 has the effect of faster action and flexible opening and closing, so that the control of the ventilation cycle is more precise, and the ventilation efficiency is also higher.

[0037] In this embodiment, the air inlet pipeline includes a mixing chamber 14, an oxygen branch and an air branch. The air inlet end of the oxygen branch is connected to the oxygen source, the air inlet end of the air branch is connected to the air source, the air outlet end of the oxygen branch and the air outlet end of the air branch meet in the mixing chamber 14, and the air outlet end of the mixing chamber 14 is connected to the patient end. In this embodiment, air and oxygen are mixed as the oxygen supply source.

[0038] More specifically, the oxygen branch includes an oxygen filter 2, an oxygen pressure sensor 3, a pressure relief valve 4, an intake check valve 5, a pressure reducing valve 6, a proportional valve 7, a filter screen 8, a flow sensor 9 and a second check valve 10 which are sequentially connected along the air intake direction. The oxygen filter 2 is connected to the oxygen source, and the second check valve 10 is connected to the mixing chamber 14. The flow direction of the second check valve is from the air intake end of the oxygen branch to the mixing chamber. The air branch includes a filter element 11, a flow meter, a noise reduction box 12 and a turbine fan 13 which are sequentially connected along the air intake direction. The air intake end of the flow meter is connected to the air source, and the air outlet end of the turbine fan 13 is connected to the mixing chamber 14.

[0039] In this embodiment, the oxygen source is high-pressure oxygen, which is connected to the mixing chamber 14 through a pipeline, and the air is low-pressure air, which is connected to the mixing chamber 14 through a pipeline, and the high-pressure oxygen and air are mixed in the mixing chamber 14. The high-pressure oxygen passes through the oxygen filter 2 in sequence to perform preliminary filtration on the high-pressure oxygen, and then the pressure of the high-pressure oxygen is monitored by the pressure sensor, and then the pressure is relieved by the pressure relief valve 4, and then the pressure of the oxygen is regulated by the intake check valve 5, the pressure reducing valve 6 and the proportional valve 7, and then the secondary filtration is performed by the filter 8, and the flow rate of the high-pressure oxygen is monitored by the flow sensor 9, and finally enters the mixing chamber 14 through the second check valve 10.

[0040] The air path is relatively simple. The gas from the air source first passes through the filter element 11. The filter element 11 includes a dust filter 8 and a HEPA filter to filter the air. The air flow is then monitored by a flow meter. The air then enters the noise reduction box 12 and the turbine fan 13. The turbine fan 13 and the noise reduction box 12 can be an integrated device. The noise reduction box 12 is used to reduce the noise generated by the turbine fan 13 when extracting air.

[0041] In this embodiment, a pipeline is used to connect the mixing chamber 14 and the patient end, and a temperature sensor 15, a mixed flow sensor 169, a free breathing valve 17, an oxygen concentration sensor 18, a safety valve 19 and a check valve 21 are sequentially arranged along the air inlet direction of the section of the pipeline. The temperature sensor 15 is used to monitor the gas temperature at the air outlet end of the mixing chamber 14; the oxygen concentration sensor 18 is used to monitor the oxygen concentration at the air outlet end of the mixing chamber 14. The air outlet end of the free breathing valve 17 is connected to the outside world, and the air inlet end of the free breathing valve 17 is connected to the pipeline between the mixing chamber 14 and the patient end; the air inlet end of the safety valve 19 is connected to the pipeline between the mixing chamber 14 and the patient end, and the air outlet end of the safety valve 19 is connected to the outside world.

[0042] Before the mixed air and oxygen (hereinafter referred to as mixed gas) enter the patient end from the mixing chamber 14, the temperature of the mixed gas is first monitored to prevent burning the patient's respiratory tract, and then the flow rate of the mixed gas is monitored by the mixed flow sensor 169. The free breathing valve 17 is used as a backup gas source. When the air branch or the oxygen branch fails, the backup gas source is opened to input gas to the patient end to deal with emergencies. The safety valve 19 discharges the over-pressure mixed gas to the outside to maintain the normal pressure of the mixed gas.

[0043] In this embodiment, the intake pipeline also includes an intake air resistor 23, which is connected in parallel to the first one-way valve 20. The intake air resistor 23 is used to balance the front and rear pressures of the first one-way valve 20. The intake air resistor 23 in this embodiment is a pipe whose cross-section first decreases from a normal size and then returns to a normal size.

[0044] In this embodiment, the air intake line further includes an inhalation pressure sensor 22. Specifically, the check valve 21 is a three-way valve, one interface of the check valve is connected to the breathing interface, one interface of the check valve is connected to the atmosphere, and one interface of the check valve is connected to the inhalation pressure sensor.

[0045] In this embodiment, the air outlet pipeline includes an expiratory air resistor 24, a pressure difference sensor 25, an expiratory pressure sensor 29 and a zeroing valve 26. The air inlet end of the expiratory air resistor 24 is connected to the patient end, and the air outlet end of the expiratory air resistor 24 is connected to the breathing valve 27. The pressure difference sensor 25 is connected in parallel with the expiratory air resistor 24, two zeroing valves 26 are provided, and the two zeroing valves 26 are respectively provided at the air inlet end and the air outlet end of the pressure difference sensor 25, and the expiratory pressure sensor 29 is provided between the pressure difference sensor 25 and the breathing valve 27. The principle of the expiratory air resistor 24 in this embodiment is the same as that of the air inlet air resistor 23.

[0046] The exhaust gas path is to let the exhaust gas pass through the exhalation air resistance 24 and then enter the breathing valve 27, and then go to the atmosphere from the breathing valve 27. When entering the exhalation air resistance 24, the differential pressure sensor 25 monitors the flow of the exhaust gas, and the two zeroing valves 26 are used to check the accuracy of the differential pressure sensor 25, and the exhalation pressure sensor 29 is used to monitor the exhalation pressure.

[0047] Second embodiment

[0048] Reference Figure 2 A respirator according to a second embodiment of the present invention comprises the gas circuit of the first embodiment; the gas circuit is arranged in the respirator body, and the respiration valve 27 is fixed on the shell of the respirator body 4.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas circuit, characterized in that: It includes a breathing valve, a first one-way valve, a control valve, an air inlet pipeline and an air outlet pipeline; The air inlet pipeline and the air outlet pipeline are independent of each other; The air inlet end of the air inlet pipeline is used to connect to the air source, the air outlet end of the air outlet pipeline is used to connect to the atmosphere, the air outlet end of the air inlet pipeline and the air inlet end of the air outlet pipeline meet at a breathing interface, and the breathing interface is used to connect to the patient end; The first one-way valve is arranged on the air inlet line, and the flow direction of the first one-way valve is from the air inlet end of the air inlet line to the air outlet end of the air inlet line; The breathing valve is arranged on the air outlet pipeline, and the control valve is connected to the breathing valve to control the opening and closing of the breathing valve.

2. The gas circuit according to claim 1, characterized in that: The control valve is an electric valve.

3. The gas circuit according to claim 1, characterized in that: The air intake pipeline includes a mixing chamber, an oxygen branch and an air branch; The gas source includes an oxygen source and an air source. The air inlet end of the oxygen branch is connected to the oxygen source, the air inlet end of the air branch is used to connect to the air source, the air outlet end of the oxygen branch and the air outlet end of the air branch meet in the mixing chamber, and the mixing chamber is connected to the breathing interface.

4. The gas circuit according to claim 2, characterized in that: The oxygen branch includes an oxygen filter, an oxygen pressure sensor, a pressure relief valve, an intake check valve, a pressure reducing valve, a proportional valve, a filter, a flow sensor and a second check valve which are sequentially connected along the intake direction; the flow direction of the second check valve is from the intake end of the oxygen branch to the mixing chamber; The oxygen filter is connected to an oxygen source, and the second one-way valve is connected to the mixing chamber.

5. The gas circuit according to claim 2, characterized in that: The air branch includes a filter element, a flow meter, a noise reduction box and a turbine fan which are sequentially connected along the air intake direction; The air inlet end of the flow meter is connected to an air source, and the air outlet end of the turbine fan is connected to the mixing chamber.

6. The gas circuit according to claim 2, characterized in that: The air intake pipeline also includes a temperature sensor, a mixed flow sensor, a free breathing valve, an oxygen concentration sensor, a safety valve and a check valve which are arranged in sequence along the air intake direction between the mixing chamber and the breathing interface; The temperature sensor is used to monitor the gas temperature at the gas outlet end of the mixing chamber; The oxygen concentration sensor is used to monitor the oxygen concentration at the air outlet of the mixing chamber; The air outlet end of the free breathing valve is connected to the mixing chamber, the air outlet end of the free breathing valve is connected to the atmosphere, the air outlet end of the safety valve is connected to the mixing chamber, and the air inlet end of the safety valve is connected to the mixing chamber; The check valve is a three-way valve, one interface of the check valve is connected to the breathing interface, one interface of the check valve is connected to the atmosphere, and one interface of the check valve is connected to an external monitoring device.

7. The gas circuit according to claim 5, characterized in that: The air intake pipeline further includes an air intake resistance, and the air intake resistance is connected in parallel to the first one-way valve.

8. The gas circuit according to claim 5, characterized in that: The air intake pipeline further comprises an air intake pressure sensor, and the air intake pressure sensor is connected to an interface of the calibration valve for connecting to an external monitoring device.

9. The gas circuit according to claim 1, characterized in that: The air outlet pipeline includes an exhalation air resistance, a pressure difference sensor, an exhalation pressure sensor and a zeroing valve; The air inlet end of the exhalation air resistance is connected to the breathing interface, and the air outlet end of the exhalation air resistance is connected to the breathing valve; The exhalation pressure sensor is connected in parallel to the exhalation air resistance, and two zeroing valves are provided, and the two zeroing valves are respectively provided at the air inlet end and the air outlet end of the exhalation pressure sensor.

10. A ventilator, characterized in that: It comprises a ventilator body and the air circuit as described in any one of claims 1 to 9, wherein the air circuit is arranged in the ventilator body, and the breathing valve is fixed on the shell of the ventilator body.

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