A gas circuit design method, gas circuit structure and device for emergency transport ventilator

Abstract

The present invention relates to the technical field of emergency ventilators, and discloses an air circuit design method, air circuit structure and device of an emergency transport ventilator, including: an oxygen circuit, including a first one-way valve, a first filter and an oxygen control and flow monitoring module arranged in sequence; an air circuit, including an air filtration and safe inhalation module; a mixed gas circuit, connected to the end of the oxygen circuit and the end of the air circuit, and the mixed gas circuit includes a turbine, an oxygen concentration sensor and a mixed gas flow detection module arranged in sequence. By modularizing the air circuit structure, the manufacturability of the air circuit structure is improved, the manufacturing cost is reduced, and the versatility of different types of equipment can be improved, the complexity of pipeline connection is reduced, and air tightness is ensured; in addition, the present invention can support a mode of ventilating patients with a mixture of air and oxygen, and can also support providing air to the patient at the patient's inhalation pressure when the ventilator is accidentally powered off, to prevent the patient from holding his breath.

Description

Technical Field

[0001] The present invention relates to the technical field of emergency ventilators, and more specifically, to an air circuit design method, an air circuit structure and a device of an emergency transport ventilator. Background Art

[0002] Most of the current emergency ventilators use electromagnetic valve group control or proportional valve control to mix air and oxygen, and then output the air and oxygen to the patient after mixing them in a certain proportion. When using ventilators in clinical treatment of patients with acute and chronic respiratory failure and ARDS (acute respiratory distress syndrome), the setting standard for the inhaled tidal volume is 8ml~12ml per kilogram of body weight, and 10ml per kilogram of body weight is usually selected. The error requirement is -15%~-5%, and positive error is not required to avoid overventilation; for the setting of the inhaled tidal volume oxygen concentration, the ventilation time of the gas with high oxygen concentration (above 80%) is generally within 2h, otherwise it is easy to cause oxygen poisoning; for the oxygen concentration of 40%~50%, the error of the oxygen concentration can be -10%~-5% for long-term ventilation, and positive error is not required to avoid oxygen poisoning. Therefore, in clinical practice, the accuracy requirements for tidal volume and oxygen concentration are not very high, that is, very small errors are not required.

[0003] In the structural design of the internal gas circuit module of the emergency ventilator, an integrated valve plate is mostly used to manufacture the gas circuit module or the gas circuit module is connected by an air pipe. Among them, the integrated valve plate has high manufacturing cost, great processing difficulty, and heavy weight, and different models are poorly replaceable. The gas circuit module composed of the air pipe connection has complex pipe connections, many joints, and it is difficult to ensure air tightness.

[0004] Therefore, it is necessary to propose an air circuit design method, air circuit structure and device for an emergency transport ventilator to at least partially solve the problems existing in the prior art. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above problems, the present invention provides an air circuit structure of an emergency transport ventilator, comprising:

[0007] An oxygen gas circuit, comprising a first one-way valve, a first filter and an oxygen control and flow monitoring module arranged in sequence;

[0008] Air circuit, including air filtration and safety air inhalation module;

[0009] The mixed gas path is connected to the end of the oxygen gas path and the end of the air gas path. The mixed gas path includes a turbine, an oxygen concentration sensor and a mixed gas flow detection module which are arranged in sequence.

[0010] Preferably, the oxygen control and flow monitoring module comprises:

[0011] An oxygen control unit, comprising a first pressure detector, a pressure reducing valve, a second pressure detector, a switch valve for controlling the opening and closing of the oxygen gas path, and a proportional valve for adjusting the oxygen ratio, which are sequentially arranged after the first filter;

[0012] The oxygen flow monitoring unit comprises a third pressure detector and a first flow detector which are sequentially arranged after the proportional valve.

[0013] Preferably, the first pressure detector, the pressure reducing valve, the second pressure detector, the switch valve and the proportional valve are all arranged on the oxygen control valve seat, and the third pressure detector and the first flow detector are both arranged on the oxygen detection valve seat; the front end cover of the oxygen detection valve seat is connected to the oxygen control valve seat through a connecting piece, and the rear end cover of the oxygen detection valve seat is connected to the mixed gas path through an oxygen output connector; a pressure differential flow channel is provided inside the oxygen detection valve seat, and rectifiers are symmetrically provided on the air inlet side and the air outlet side of the pressure differential flow channel.

[0014] Preferably, the rectifier comprises: a honeycomb baffle, a first mesh plate and a second mesh plate arranged in sequence, the honeycomb baffle and the first mesh plate are connected by a first shaft ring, and the first mesh plate and the second mesh plate are connected by a second shaft ring;

[0015] The honeycomb baffle located at the air inlet side of the pressure differential flow channel is arranged close to the front end cover, and the honeycomb baffle located at the air outlet side of the pressure differential flow channel is arranged close to the rear end cover.

[0016] Preferably, the air filtration and safety air inhalation module comprises: a second filter and a second one-way valve for filtering the air introduced into the air path;

[0017] When the ventilator has an abnormal power failure and the inhalation pressure is less than or equal to the set pressure, the air filtration and safety inhalation module can provide air greater than or equal to the set flow rate.

[0018] Among them, the set pressure is 6cmH2O and the set flow rate is 30L / min.

[0019] Preferably, the second filter is arranged in the mounting cylinder, and an air inlet hole is provided on the end face of the air inlet side of the mounting cylinder, and a clamping part is provided on the outer side thereof; the air outlet side of the mounting cylinder is an open end, and a fixing part is connected to the open end, and a plurality of through holes are provided on the fixing part, and the second one-way valve is connected to the air outlet side of the fixing part; the air outlet side of the fixing part is connected to a limit part for limiting the opening of the second one-way valve, and the limit part is provided with a plurality of partitions arranged at intervals along the circumferential direction.

[0020] Preferably, the mixed gas flow detection module comprises: a fourth pressure detector and a second flow detector which are sequentially arranged after the oxygen concentration sensor.

[0021] The mixed gas path further comprises: a mixing chamber for connecting with the oxygen gas path and the air gas path, and the turbine is arranged at the gas outlet side of the mixing chamber.

[0022] A method for designing an air circuit of an emergency transport ventilator, applied to the air circuit structure of the emergency transport ventilator of the present invention, comprises:

[0023] S1. Establish an initial three-dimensional model of the gas path structure, parameterize the initial three-dimensional model of the gas path structure, and select parameters related to the optimization target as design parameters;

[0024] S2. Generate a design parameter combination according to the setting range of each design parameter;

[0025] S3. Modify the initial three-dimensional model of the gas path structure according to the design parameter combination to obtain an updated three-dimensional model of the gas path structure;

[0026] S4, performing airflow simulation on the updated three-dimensional model of the air path structure and obtaining simulation results;

[0027] S5, judging whether the simulation result corresponding to the design parameter combination meets the optimization target, if so, selecting the current design parameter combination as the target design parameter combination, if not, optimizing the design parameter combination to obtain the optimized design parameter combination, and repeating step S3;

[0028] The airflow simulation is as follows: the gas is sucked out from the end of the mixed gas path at a constant suction pressure, and the pressure and flow at the end of the mixed gas path are obtained in real time, and the airflow stability value of the gas path structure is obtained according to the pressure at the end of the mixed gas path; the suction pressure is less than the set pressure;

[0029] The optimization goal is: the air flow stability value of the air path structure is less than the set stability value, and the flow rate at the end of the mixed air path is greater than the set flow rate.

[0030] Preferably, obtaining the air flow stability value of the air path structure according to the pressure at the end of the mixed air path includes:

[0031] According to the pressure at the end of the mixed gas path, a curve of the relationship between pressure and time is obtained;

[0032] According to the relationship curve between pressure and time at the end of the mixed gas path, the pressure and time corresponding to all the maximum points and the pressure and time corresponding to all the minimum points on the mixed gas path are obtained;

[0033] The airflow stability value of the air path structure is obtained based on the pressure and time corresponding to all the maximum points on the pressure-time relationship curve, and the pressure and time corresponding to all the minimum points.

[0034] An emergency transport ventilator device comprises the air path structure of the emergency transport ventilator described in the present invention.

[0035] Compared with the prior art, the present invention has at least the following beneficial effects:

[0036] The air circuit design method, air circuit structure and device of the emergency transport ventilator described in the present invention modularize the air circuit structure, and set up an oxygen control and flow monitoring module, an air filtration and safe inhalation module and a mixed gas flow detection module, thereby improving the manufacturability of the air circuit structure, reducing manufacturing costs, and being able to improve the versatility of equipment of different models, reducing the complexity of pipeline connections, and ensuring air tightness; in addition, the present invention can support a mode of ventilating patients with a mixture of air and oxygen, and can also support providing air to the patient at the patient's inhalation pressure when the ventilator is accidentally powered off, to prevent the patient from holding his breath.

[0037] The air circuit design method, air circuit structure and device of the emergency transport ventilator described in the present invention, and other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will also be understood by technicians in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0039] Figure 1 A connection block diagram of the gas circuit structure of the emergency transport ventilator of the present invention;

[0040] Figure 2 It is a structural schematic diagram of a ventilator side shell in the air path structure of the emergency transport ventilator of the present invention;

[0041] Figure 3 It is a structural schematic diagram of the oxygen control and flow monitoring module in the gas path structure of the emergency transport ventilator described in the present invention;

[0042] Figure 4It is a structural schematic diagram of the air filtration and safety inhalation module in the air path structure of the emergency transport ventilator described in the present invention;

[0043] Figure 5 It is a structural schematic diagram of a mixed gas circuit in the gas circuit structure of the emergency transport ventilator of the present invention;

[0044] Figure 6 The present invention is a flow chart of the gas circuit design method of the emergency transport ventilator. DETAILED DESCRIPTION

[0045] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0046] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0047] like Figure 1 As shown, the present invention provides an air circuit structure of an emergency transport ventilator, comprising:

[0048] The oxygen gas circuit includes a first one-way valve 3, a first filter 4 and an oxygen control and flow monitoring module 8 which are arranged in sequence;

[0049] Air circuit, which includes an air filtration and safety air inhalation module 5;

[0050] The mixed gas path is connected to the end of the oxygen gas path and the end of the air gas path, and the mixed gas path includes a turbine 18, an oxygen concentration sensor 19 and a mixed gas flow detection module 20 which are arranged in sequence.

[0051] The present invention divides the breathing gas circuit into an oxygen gas circuit, an air gas circuit and a mixed gas circuit according to the use of the ventilator;

[0052] The oxygen gas circuit is used to introduce high-pressure oxygen 2, and the high-pressure oxygen 2 is connected to the oxygen control and flow monitoring module 8 through the oxygen gas pipe. The oxygen gas pipe is provided with a first one-way valve 3 and a first filter 4 in sequence. The high-pressure oxygen enters the oxygen control and flow monitoring module 8 through the first one-way valve 3 and the first filter 4. The oxygen control and flow monitoring module 8 is used to control and monitor the introduced high-pressure oxygen 2;

[0053] The air path is used to introduce air 1. When the patient inhales, air can enter from the air filtration and safety inhalation module 5. The air filtration and safety inhalation module 5 can be set to be detachably connected to the main unit of the ventilator, which is convenient for replacement; in the event of an accidental power failure of the ventilator, the air filtration and safety inhalation module 5 can allow air to enter under the patient's inhalation pressure, provide air for the patient, and prevent the patient from holding his breath;

[0054] The mixed gas path is used to connect with the end of the oxygen gas path (the end of the oxygen control and flow monitoring module 8) and the end of the air gas path (the end of the air filtration and safety inhalation module 5). The oxygen and air are mixed and blown out by the turbine 18 to provide tidal power. The oxygen concentration sensor 19 detects the oxygen concentration after mixing, and the mixed gas flow detection module 20 detects the flow rate of oxygen and air after mixing.

[0055] The present invention modularizes the gas circuit structure and provides an oxygen control and flow monitoring module 8, an air filtration and safe inhalation module 5, and a mixed gas flow detection module 20, thereby improving the manufacturability of the gas circuit structure, reducing the manufacturing cost, and being able to improve the versatility of equipment of different models, reducing the complexity of pipeline connection, and ensuring air tightness; in addition, the present invention can support a mode of ventilating the patient with a mixture of air and oxygen, and can also support providing air to the patient at the patient's inhalation pressure when the ventilator is accidentally powered off, to prevent the patient from holding his breath.

[0056] like Figure 1 and Figure 2 As shown, further, it also includes: an external gas circuit 30, which includes a breathing tube 26 arranged at the end of the mixed gas circuit, and the breathing tube 26 is sequentially provided with a third filter 23, a proximal flow detector 24, an end-tidal carbon dioxide detector 28 and a breathing mask 29, a proximal pressure detector 27 is provided between the end-tidal carbon dioxide detector 28 and the breathing mask 29, and a bronchial circuit connected to the air is also provided on the breathing tube 26 between the third filter 23 and the proximal flow detector 24, and a breathing valve 25 is provided on the bronchial circuit; as shown Figure 5 As shown, an output interface 34 connected to the external gas circuit 30 is provided at the end of the mixed gas circuit.

[0057] like Figure 1 As shown, in one embodiment, the oxygen control and flow monitoring module 8 includes:

[0058] An oxygen control unit 9, which includes a first pressure detector 11, a pressure reducing valve 12, a second pressure detector 13, a switch valve 14 for controlling the opening and closing of the oxygen gas path, and a proportional valve 15 for adjusting the oxygen ratio, which are sequentially arranged after the first filter 4;

[0059] In the oxygen control unit 9, the first pressure detector 11 detects the gas source pressure of the high-pressure oxygen 2, and then the pressure is reduced by the pressure reducing valve 12, and the second pressure detector 13 detects the pressure after the pressure reduction, and the opening and closing of the oxygen gas path are controlled by the switch valve 14, and the proportion of oxygen introduction is adjusted by the proportional valve 15;

[0060] The oxygen flow monitoring unit 10 includes a third pressure detector 17 and a first flow detector 16 which are sequentially arranged after the proportional valve 15;

[0061] In the oxygen flow monitoring unit 10, the third pressure detector 17 is used to detect the pressure in the airway. By detecting the pressure in the airway, the oxygen flow detection is compensated, and then the oxygen flow is detected by the first flow detector 16, thereby improving the stability of the oxygen flow detection.

[0062] like Figure 3 As shown, in one embodiment, the first pressure detector 11, the pressure reducing valve 12, the second pressure detector 13, the switch valve 14 and the proportional valve 15 are all arranged on the oxygen control valve seat 36, and the third pressure detector 17 and the first flow detector 16 are all arranged on the oxygen detection valve seat 39; the front end cover 38 of the oxygen detection valve seat 39 is connected to the oxygen control valve seat 36 through a connecting piece 37 (joint nut), and the rear end cover 40 of the oxygen detection valve seat 39 is connected to the mixed gas path through an oxygen output connector 41 (quick connector); a pressure differential flow channel 65 is provided inside the oxygen detection valve seat 39, and rectifiers are symmetrically provided on the air inlet side and the air outlet side of the pressure differential flow channel 65.

[0063] The oxygen control valve seat 36 is connected to the oxygen gas pipe through the oxygen input connector 35, and the oxygen gas pipe is connected to the high-pressure oxygen 2. The oxygen input connector 35 and the oxygen output connector 41 are both quick-connect connectors; the connector 37 is sealed with the oxygen control valve seat 36 and the front end cover 38, and the front end cover 38 and the rear end cover 40 are both sealed with the oxygen detection valve seat 39, and the rear end cover 40 is sealed with the oxygen output connector 41. The oxygen control and flow monitoring module 8 is not connected with a gas pipe as a whole, but forms a gas path through the oxygen control valve seat 36 and the oxygen detection valve seat 39;

[0064] The high-pressure oxygen 2 enters the oxygen control valve seat 36 through the oxygen input connector 35, the pressure of the oxygen introduced is detected by the first pressure detector 11, and then the pressure is reduced to a set value by the pressure reducing valve 12, and the pressure after the pressure reduction is detected by the second pressure detector 13. The switch valve 14 controls the opening and closing of the oxygen gas path, the proportional valve 15 controls the oxygen flow rate, and the connecting piece 37 connects the oxygen control valve seat 36 and the oxygen detection valve seat 39. The oxygen enters the front end cover 38, and the bell mouth set in the front end cover 38 performs primary diffusion of the high-speed oxygen, and then performs secondary diffusion and rectification through the rectifier, and then generates a pressure difference through the pressure differential flow channel 65, and performs pressure detection through the third pressure detector 17 and compensates the detected flow by pressure, and performs flow detection through the first flow detector 16, and then rectifies again through the rectifier, and outputs the oxygen from the oxygen output connector 41 after the flow is concentrated from the rear end cover 40.

[0065] Through the above design, the high-speed jet formed by the incoming high-pressure oxygen can be rectified, and the flow detection can be compensated by detecting the pressure in the airway, thereby improving the flow detection accuracy.

[0066] Further, the rectifier includes: a honeycomb baffle 60, a first mesh plate 62 and a second mesh plate 64 arranged in sequence, the honeycomb baffle 60 and the first mesh plate 62 are connected by a first shaft ring 61, and the first mesh plate 62 and the second mesh plate 64 are connected by a second shaft ring 63;

[0067] The honeycomb baffle 60 located at the air inlet side of the pressure difference channel 65 is arranged close to the front end cover 38 , and the honeycomb baffle 60 located at the air outlet side of the pressure difference channel 65 is arranged close to the rear end cover 40 .

[0068] The first mesh plate 62 and the second mesh plate 64 are both made of steel mesh. The honeycomb baffle 60 of the rectifier located on the air inlet side can perform secondary diffusion on the high-speed oxygen passing through the bell mouth, and then rectify it through two layers of steel mesh, wherein the first shaft ring 61 and the second shaft ring 63 are used to fix the honeycomb baffle 60, the first mesh plate 62 and the second mesh plate 64; the two layers of steel mesh of the rectifier located on the air outlet side rectify the detected oxygen, and then the oxygen is concentrated through the honeycomb baffle 60 and the rear end cover 40, and then the oxygen is output through the oxygen output connector 41.

[0069] The honeycomb baffle 60 plays a role in preventing jets, and the high-speed jets can be rectified by the first mesh plate 62 and the second mesh plate 64 to improve the detection accuracy of the oxygen flow.

[0070] like Figure 1 As shown, in one embodiment, the air filtering and safety inhalation module 5 comprises: a second filter 6 and a second one-way valve 7 for filtering the air introduced into the air path;

[0071] When the ventilator is abnormally powered off and the inhalation pressure is less than or equal to the set pressure, the air filtration and safety inhalation module 5 can provide air with a flow rate greater than or equal to the set flow rate.

[0072] Among them, the set pressure is 6cmH2O and the set flow rate is 30L / min.

[0073] When an abnormal power outage occurs, the air circuit and the mixed air circuit are always connected. Therefore, when the patient breathes spontaneously, the second one-way valve 7 can be opened, and air can enter from the air filtration and safety inhalation module 5 under the inhalation pressure, thereby providing air for the patient and preventing the patient from holding his breath. In addition, the setting of the entire air circuit structure can provide air greater than or equal to the set flow rate when the inhalation pressure is less than or equal to the set pressure.

[0074] Furthermore, if Figure 2 , Figure 4 , Figure 5 As shown, the second filter 6 is arranged in the mounting cylinder 51, and an air inlet hole is provided on the end face of the air inlet side of the mounting cylinder 51, and a clamping part 52 is provided on the outer side thereof; the air outlet side of the mounting cylinder 51 is an open end, and a fixing part 53 is connected to the open end, and a plurality of through holes are provided on the fixing part 53, and the second one-way valve 7 is connected to the air outlet side of the fixing part 53; the air outlet side of the fixing part 53 is connected to a limit part 54 for limiting the opening of the second one-way valve 7, and a plurality of partitions arranged at intervals along the circumferential direction are provided on the limit part 54.

[0075] The mounting tube 51 is connected to the fixing member 53 by threads, the fixing member 53 is connected to the limiting member 54 by threads, the second filter 6 is limited between the mounting tube 51 and the fixing member 53, and the second one-way valve 7 is connected to the fixing member 53; the above connection method can facilitate the replacement of the second filter 6 and the second one-way valve 7; the second one-way valve 7 adopts an umbrella valve, and the opening angle of the umbrella valve is limited by the limiting member 54, so as to reduce the opening angle of the umbrella valve, prevent the umbrella valve from being over-opened to cause aging or damage, increase the service life of the umbrella valve, and reduce the replacement frequency;

[0076] like Figure 2 and Figure 4 As shown, the clip 52 provided on the mounting tube 51 can be snapped into the side shell of the ventilator. By pinching the two clips 52 on the mounting tube 51, the overall installation and disassembly of the air filtration and safety inhalation module 5 can be achieved. After installation in place, after loosening the two clips 52, the clip 52 can be snapped into the slot of the side shell of the ventilator, which facilitates the replacement of the air filtration and safety inhalation module 5.

[0077] like Figure 1 As shown, in one embodiment, the mixed gas flow detection module 20 includes: a fourth pressure detector 21 and a second flow detector 22 which are sequentially arranged after the oxygen concentration sensor 19;

[0078] The fourth pressure detector 21 is used to detect the pressure in the airway so as to compensate the flow of the mixed gas entering the mixed gas path;

[0079] like Figure 5 As shown, the mixed gas path further includes: a mixing chamber 33 for connecting with the oxygen gas path and the air gas path, and the turbine 18 is arranged on the gas outlet side of the mixing chamber 33 .

[0080] The mixing chamber 33 is connected to the air path and the oxygen path respectively. Figure 5 The O2 shown in the figure is the oxygen interface connecting the mixing chamber 33 and the oxygen output connector 41 in the oxygen gas circuit. Figure 5 The "Air" shown in the figure is the location where the air is introduced. Figure 5 It is shown that the air filtration and safety air inhalation module 5 is arranged on one side of the mixing chamber 33;

[0081] Air enters through the air inlet on the mounting tube 51, is filtered by the second filter 6, and then enters the mixing chamber 33 through the second one-way valve 7. The mixing chamber 33 may be T-shaped. Oxygen enters the mixing chamber 33 through the oxygen control and flow monitoring module 8 to achieve mixing of oxygen and air. After mixing, it is blown out by the turbine 18, and the concentration of oxygen is detected by the oxygen concentration sensor 19. After detection by the fourth pressure detector 21 and the second flow detector 22, it is output from the output interface 34 at the end of the mixed gas path to the external gas path 30 to provide mixed gas for the patient.

[0082] like Figure 6 As shown, a method for designing an air circuit of an emergency transport ventilator is applied to the air circuit structure of the emergency transport ventilator described in the present invention, comprising:

[0083] S1. Establish an initial three-dimensional model of the gas path structure, parameterize the initial three-dimensional model of the gas path structure, and select parameters related to the optimization target as design parameters;

[0084] Since the gas in the gas path structure will encounter resistance when it flows, the resistance generally occurs at the turning point of the gas path and the second one-way valve 7 in the air filtration and safety inhalation module 5. When the patient inhales, it is necessary to overcome the movement resistance of the second one-way valve 7, and the resulting airflow will cause pressure loss at the turning point of the gas path. Therefore, the parameters related to the turning point of the gas path and the air filtration and safety inhalation module 5 are selected as design parameters to optimize the design of the gas path structure.

[0085] S2. Generate a design parameter combination according to the setting range of each design parameter;

[0086] When designing the gas path structure, each design parameter has its corresponding setting range. When each design parameter selects a value within its setting range, multiple design parameters form a design parameter combination.

[0087] S3. Modify the initial three-dimensional model of the gas path structure according to the design parameter combination to obtain an updated three-dimensional model of the gas path structure;

[0088] In this step, the design parameter combination includes the design parameter combination generated in step S2 and the design parameter combination optimized in step S5, and the initial three-dimensional model of the gas path structure is modified by the design parameter combination;

[0089] S4, performing airflow simulation on the updated three-dimensional model of the air path structure and obtaining simulation results;

[0090] The airflow simulation is as follows: the gas is sucked out from the end of the mixed gas path at a constant suction pressure, and the pressure and flow at the end of the mixed gas path are obtained in real time, and the airflow stability value of the gas path structure is obtained according to the pressure at the end of the mixed gas path; the suction pressure is less than the set pressure;

[0091] When performing airflow simulation, only the airflow of the air path and the mixed air path is simulated, mainly to optimize the design parameters of the air filtration and safety inhalation module 5, so as to ensure that air can be supplied through the patient's spontaneous breathing when power is unexpectedly cut off, and to ensure the stability of the supply;

[0092] S5, judging whether the simulation result corresponding to the design parameter combination meets the optimization target, if so, selecting the current design parameter combination as the target design parameter combination, if not, optimizing the design parameter combination to obtain the optimized design parameter combination, and repeating step S3;

[0093] The optimization goal is: the air flow stability value of the air path structure is less than the set stability value, and the flow rate at the end of the mixed air path is greater than the set flow rate;

[0094] In this step, the simulation results need to be judged to determine whether they meet the optimization target. If not, step S3 is repeated until the optimization target is met. If so, the optimization is stopped.

[0095] Among them, the optimization of the design parameter combination includes: based on the simulation results of the current design parameter combination, the correlation and sensitivity of each design parameter to the optimization target can be obtained, and multiple design parameters with relatively high sensitivity to the optimization target are selected from all the design parameters as the design parameters to be optimized, and then the correlation between the design parameters to be optimized and the optimization target is used to determine the optimization direction of each design parameter to be optimized, and according to the optimization direction of each design parameter to be optimized and the relationship between the simulation results corresponding to the current design parameter combination and the optimization target, a new design parameter combination, that is, the optimized design parameter combination, is regenerated.

[0096] Furthermore, the air flow stability value of the air path structure is obtained according to the pressure at the end of the mixed air path, including:

[0097] According to the pressure at the end of the mixed gas path, a curve of the relationship between pressure and time is obtained;

[0098] According to the relationship curve between pressure and time at the end of the mixed gas path, the pressure and time corresponding to all the maximum points and the pressure and time corresponding to all the minimum points on the mixed gas path are obtained;

[0099] The airflow stability value of the air path structure is obtained based on the pressure and time corresponding to all the maximum points on the pressure-time relationship curve, and the pressure and time corresponding to all the minimum points.

[0100] The formula for the airflow stability value is as follows:

[0101]

[0102] Where W is the air flow stability value, F 2i and T 2i is the pressure and time corresponding to the 2ith maximum point on the pressure-time curve, F 2i-1 and T 2i-1 is the pressure and time corresponding to the 2i-1th minimum point on the pressure-time curve, F 2i+1 and T 2i+1 is the pressure and time corresponding to the 2i+1th minimum point on the pressure-time curve, and n is the number of minimum or maximum points on the pressure-time curve.

[0103] The air flow stability value can reflect the flow stability of air entering the air path under the inhalation pressure, so as to ensure that in the event of an unexpected power outage, the patient's spontaneous breathing can provide a relatively stable air flow through the air filtration and safety inhalation module 5, and prevent the air filtration and safety inhalation module 5 from being unable to allow air to enter when the inhalation pressure is less than or equal to the set pressure, or the air flow entering is unstable, causing the patient to hold his breath;

[0104] When the gas is sucked out from the end of the mixed gas path, under the action of the suction pressure, the second one-way valve 7 in the air filtration and safety suction module 5 will open to allow air to enter and form an airflow. However, the airflow will vibrate after passing through the bend of the gas path, and the pressure formed by the airflow will fluctuate. The fluctuation of the airflow will affect the opening angle of the second one-way valve 7, resulting in poor stability of the airflow or causing the second one-way valve 7 to close when fluctuations occur. Since the pressure of the airflow at the bend of the gas path is in a fluctuating state, the airflow is positively correlated with the peak value of the fluctuation when it hits the bend, and negatively correlated with the period of the fluctuation. Therefore, the above formula is used to calculate the airflow stability value using the peak change of the pressure fluctuation and the period of the fluctuation, which can accurately indicate the degree of influence of the airflow on the airflow pressure when it passes through the bend of the gas path. The larger the airflow stability value calculated by the formula is, the greater the pressure fluctuation is, the greater the influence of the bend in the air path on the flow of the airflow is, the lower the stability of the airflow flow is, the higher the risk of the second one-way valve 7 being closed is, and the use stability of the air filtration and safety air intake module 5 is lower; conversely, the smaller the airflow stability value calculated by the formula is, the smaller the pressure fluctuation is, the smaller the influence of the bend in the air path on the flow of the airflow is, the higher the stability of the airflow flow is, the lower the risk of the second one-way valve 7 being closed is, and the use stability of the air filtration and safety air intake module 5 is higher; therefore, one of the optimization goals is that the airflow stability value of the air path structure is less than the set stability value, thereby ensuring the use stability of the air filtration and safety air intake module 5 and minimizing the influence of the bend in the air path on the flow of the airflow.

[0105] An emergency transport ventilator device comprises the air path structure of the emergency transport ventilator described in the present invention.

[0106] The emergency transport ventilator device using the air circuit structure described in the present invention can reduce manufacturing costs, the modular air circuit structure is more conducive to disassembly and maintenance, and the modular air circuit structure can be applicable to a variety of different models of emergency transport ventilator devices.

[0107] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0108] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0109] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An air circuit structure of an emergency transport ventilator, characterized in that: include: An oxygen gas circuit, comprising a first one-way valve (3), a first filter (4) and an oxygen control and flow monitoring module (8) which are arranged in sequence; An air circuit, comprising an air filtration and safety inhalation module (5); A mixed gas path connected to the end of the oxygen gas path and the end of the air gas path, the mixed gas path comprising a turbine (18), an oxygen concentration sensor (19) and a mixed gas flow detection module (20) which are arranged in sequence; The air filtering and safe air inhalation module (5) comprises: a second filter (6) and a second one-way valve (7) for filtering air introduced into the air path; When the ventilator experiences an abnormal power outage and the inhalation pressure is less than or equal to the set pressure, the air filtration and safety inhalation module (5) is capable of providing air at a flow rate greater than or equal to the set flow rate; The design method of the gas path structure includes: S1. Establish an initial three-dimensional model of the gas path structure, parameterize the initial three-dimensional model of the gas path structure, and select parameters related to the optimization target as design parameters; S2. Generate a design parameter combination according to the setting range of each design parameter; S3. Modify the initial three-dimensional model of the gas path structure according to the design parameter combination to obtain an updated three-dimensional model of the gas path structure; S4, performing airflow simulation on the updated three-dimensional model of the air path structure and obtaining simulation results; S5, judging whether the simulation result corresponding to the design parameter combination meets the optimization target, if so, selecting the current design parameter combination as the target design parameter combination, if not, optimizing the design parameter combination to obtain the optimized design parameter combination, and repeating step S3; The airflow simulation is as follows: the gas is sucked out from the end of the mixed gas path at a constant suction pressure, and the pressure and flow at the end of the mixed gas path are obtained in real time, and the airflow stability value of the gas path structure is obtained according to the pressure at the end of the mixed gas path; the suction pressure is less than the set pressure; When performing airflow simulation, only the airflow in the air path and the mixed air path is simulated; The optimization goal is: the air flow stability value of the air path structure is less than the set stability value, and the flow rate at the end of the mixed air path is greater than the set flow rate; The air flow stability value of the air path structure is obtained according to the pressure at the end of the mixed air path, including: According to the pressure at the end of the mixed gas path, a curve of the relationship between pressure and time is obtained; According to the relationship curve between pressure and time at the end of the mixed gas path, the pressure and time corresponding to all the maximum points and the pressure and time corresponding to all the minimum points on the mixed gas path are obtained; The airflow stability value of the air path structure is obtained based on the pressure and time corresponding to all the maximum points on the pressure-time relationship curve, and the pressure and time corresponding to all the minimum points.

2. The air circuit structure of the emergency transport ventilator according to claim 1 is characterized in that: The oxygen control and flow monitoring module (8) comprises: An oxygen control unit (9), comprising a first pressure detector (11), a pressure reducing valve (12), a second pressure detector (13), a switch valve (14) for controlling the opening and closing of an oxygen gas path, and a proportional valve (15) for adjusting the oxygen ratio, which are sequentially arranged after the first filter (4); An oxygen flow monitoring unit (10) comprises a third pressure detector (17) and a first flow detector (16) which are sequentially arranged after a proportional valve (15).

3. The air circuit structure of the emergency transport ventilator according to claim 2 is characterized in that: The first pressure detector (11), the pressure reducing valve (12), the second pressure detector (13), the switch valve (14) and the proportional valve (15) are all arranged on the oxygen control valve seat (36), and the third pressure detector (17) and the first flow detector (16) are all arranged on the oxygen detection valve seat (39); the front end cover (38) of the oxygen detection valve seat (39) is connected to the oxygen control valve seat (36) via a connecting piece (37), and the rear end cover (40) of the oxygen detection valve seat (39) is connected to the mixed gas path via an oxygen output connector (41); a pressure differential flow channel (65) is provided inside the oxygen detection valve seat (39), and rectifiers are symmetrically provided on the air inlet side and the air outlet side of the pressure differential flow channel (65).

4. The air circuit structure of the emergency transport ventilator according to claim 3 is characterized in that: The rectifier comprises: a honeycomb baffle (60), a first mesh plate (62) and a second mesh plate (64) arranged in sequence, the honeycomb baffle (60) and the first mesh plate (62) being connected via a first shaft ring (61), and the first mesh plate (62) and the second mesh plate (64) being connected via a second shaft ring (63); The honeycomb baffle (60) located on the air inlet side of the pressure differential flow channel (65) is arranged close to the front end cover (38), and the honeycomb baffle (60) located on the air outlet side of the pressure differential flow channel (65) is arranged close to the rear end cover (40).

5. The air circuit structure of the emergency transport ventilator according to claim 1, characterized in that: The second filter (6) is arranged in the mounting cylinder (51); an air inlet hole is provided on the end face of the air inlet side of the mounting cylinder (51), and a clamping member (52) is provided on the outer side of the air inlet side of the mounting cylinder (51); the air outlet side of the mounting cylinder (51) is an open end, a fixing member (53) is connected to the open end, a plurality of through holes are provided on the fixing member (53), and the second one-way valve (7) is connected to the air outlet side of the fixing member (53); a limiting member (54) for limiting the opening of the second one-way valve (7) is connected to the air outlet side of the fixing member (53), and a plurality of partitions arranged at intervals along the circumferential direction are provided on the limiting member (54).

6. The air circuit structure of the emergency transport ventilator according to claim 1, characterized in that: The mixed gas flow detection module (20) comprises: a fourth pressure detector (21) and a second flow detector (22) which are arranged sequentially after the oxygen concentration sensor (19).

7. An emergency transport ventilator device, characterized in that: The invention comprises the air path structure of the emergency transport ventilator as described in any one of claims 1 to 6.

Images