Medical humidifier and method for early warning of over-temperature gas

Abstract

The application provides a medical humidifier and a method for early warning of over-temperature gas. In the medical humidifier, an air inlet is used for receiving gas delivered by a gas supply pipeline of an external breathing machine and transmitting the gas to a humidification tank; the humidification tank is used for heating and humidifying the inflowing gas according to predetermined temperature and humidity requirements, and the heated and humidified gas flows out through an air outlet; the air outlet is used for delivering the heated and humidified gas to an air suction pipeline of the external breathing machine, so that the heated and humidified gas is delivered to a user interface through the air suction pipeline; a gas flow direction detection module is in communication with the air outlet and is used for detecting the flow direction of the gas at the air outlet, if the flow direction is from the air suction pipeline of the breathing machine to the air outlet, the humidification tank is triggered to stop heating; an over-temperature early warning module is used for obtaining the temperature of the gas delivered to the user interface, if the temperature of the gas meets the pre-set over-temperature early warning condition, the humidification tank is triggered to stop heating. The application can more effectively perform high-temperature early warning protection.

Description

TECHNICAL FIELD

[0001] One or more embodiments of the present application relate to the technical field of medical devices, and in particular to a medical humidifier and a method for early warning of over-temperature gas. BACKGROUND

[0002] Normally, the upper respiratory tract of a human body has a function of warming and humidifying inhaled gas to maintain normal physiological functions and defense functions of the mucous membrane and cilia system of the airway. However, due to the establishment of an artificial airway, the upper respiratory tract of a mechanically ventilated patient loses the functions of warming, humidifying and filtering bacteria. If the artificial airway is not humidified enough, the cilia function of the trachea and bronchus will be impaired, which can easily cause airway dehydration, form sputum crust and cause airway obstruction; at the same time, the pulmonary surfactant can be damaged, which can lead to a decrease in lung compliance and cause or aggravate complications such as pulmonary infection.

[0003] In order to solve the above problems, a medical humidifier is usually used at present. Referring to Figure 1 , the medical humidifier warms and humidifies dry medical gas to a state close to the human body based on physical heating and control of the contact area of the gas and water. The medical humidifier is used in cooperation with a breathing machine of a mechanically ventilated patient to ensure the safety of the mechanically ventilated patient.

[0004] In the process of heating the gas, if the temperature of the gas exceeds a safe range, the equipment can be damaged or the user can be in danger. In order to prevent this situation, early warning of over-temperature gas is needed. However, at present, there is no effective method for early warning of over-temperature gas applied to the medical humidifier. SUMMARY

[0005] One or more embodiments of the present application describe a medical humidifier and a method for early warning of over-temperature gas, which can more effectively perform early warning of over-temperature gas.

[0006] According to a first aspect, a medical humidifier is provided, which comprises: a gas inlet, a humidification tank, a gas outlet, an over-temperature early warning module and a gas flow direction detection module; wherein,

[0007] The gas inlet is configured to receive gas delivered by a gas supply pipeline of an external breathing machine and transmit the gas to the humidification tank;

[0008] The humidification tank is configured to heat and humidify the inflowing gas according to predetermined temperature and humidity requirements, and the heated and humidified gas flows out through the gas outlet;

[0009] The gas outlet is configured to deliver the heated and humidified gas to an inhalation pipeline of the external breathing machine, so as to deliver the heated and humidified gas to a user interface through the inhalation pipeline;

[0010] The airflow direction detection module is in communication with the air outlet and is configured to detect the flow direction of the gas at the air outlet, and if the flow direction of the gas is from the inspiratory pipeline of the breathing machine to the air outlet, the humidification tank is triggered to stop heating and automatic power-off protection is performed.

[0011] The over-temperature early warning module is configured to determine whether the preset over-temperature early warning condition is met at present, and if so, the humidification tank is triggered to stop heating and automatic power-off protection is performed.

[0012] The airflow direction detection module comprises a first heating element and a second heating element symmetrically arranged at both ends of the air outlet, temperature sensors connected to the two heating elements respectively, and a comparison submodule.

[0013] The first heating element is located on a first port of the air outlet, which is a port of the air outlet close to the humidification tank.

[0014] The second heating element is located on a second port of the air outlet, which is a port of the air outlet close to the inspiratory pipeline of the breathing machine.

[0015] The comparison submodule is configured to obtain the temperatures of the first heating element and the second heating element through the first temperature sensor, and if the temperature of the first heating element is higher than the temperature of the second heating element, it is determined that the flow direction of the gas is from the inspiratory pipeline of the breathing machine to the air outlet, and the humidification tank is triggered to stop heating and automatic power-off protection is performed.

[0016] The over-temperature early warning module comprises a power-off triggering module and a calculation module.

[0017] The calculation module is configured to determine whether the preset over-temperature early warning condition is met at present in real time.

[0018] The power-off triggering module is configured to trigger the humidification tank to stop heating and perform automatic power-off protection when the calculation module determines that the preset over-temperature early warning condition is met at present.

[0019] The over-temperature early warning module further comprises a second temperature sensor configured to measure the ambient temperature in real time.

[0020] The calculation module is configured to calculate T(t) according to the following first calculation formula:

[0021]

[0022] wherein T(t) is the temperature of the gas delivered to the user interface at the current time t; T env is the ambient temperature at the current time t; P heatk is the heating power output of the humidification tank at the current time t. loss C is the heat loss coefficient; total The total heat capacity of the system, including the heat capacity of the water and the container; T initial The initial temperature of the water in the humidification tank;

[0023] If the calculated T(t) > T safe If so, then the pre-set over-temperature warning conditions are met; where T safe A pre-set user safety temperature threshold.

[0024] The over-temperature warning module further includes: a third temperature sensor for real-time measurement of ambient temperature;

[0025] The calculation module is used to determine in real time whether the following inequality is true:

[0026]

[0027] If the inequality holds, then the pre-set over-temperature warning conditions are met.

[0028] Among them, P heat T is the heating power output of the humidification tank at the current time t; env The ambient temperature at the current time t; k loss T is the heat loss coefficient; safe For the preset user safety temperature threshold; C total The total heat capacity of the system, including the heat capacity of the water and the container; T initial The initial temperature of the water in the humidification tank; t max This refers to the maximum allowable operating time of the medical humidifier during a single power-on cycle.

[0029] Further includes: a first humidity adjustment module and a float valve;

[0030] The first humidity adjustment module is used to detect the humidity of the gas delivered to the user interface. If the detected humidity value is greater than the preset user safe humidity threshold, the water level of the humidifying water in the container is lowered through the float valve; if the detected humidity value is less than the preset user safe humidity threshold, the water level of the humidifying water in the container is raised through the float valve.

[0031] Further includes: a second humidity adjustment module;

[0032] The second humidity adjustment module is configured to detect the humidity of the gas delivered to the user interface, and if the detected humidity value is greater than a pre-set user safety humidity threshold, reduce the heating power of the humidification tank for heating the gas; if the detected humidity value is less than the pre-set user safety humidity threshold, increase the heating power of the humidification tank for heating the gas.

[0033] The medical humidifier further comprises a metal heat-conducting disc or a heat sink, which is arranged in the humidification tank to accelerate heat transfer in the humidification tank and prevent overheating in local areas of the humidification tank.

[0034] And / or,

[0035] The over-temperature early warning module comprises a temperature fuse connected in series in the heating element circuit of the humidification tank, which is fused when the over-temperature early warning module determines that the pre-set over-temperature early warning condition is met, so as to stop the humidification tank from heating and perform automatic power-off protection.

[0036] The method for early warning of over-temperature gas of a medical humidifier, which comprises:

[0037] Receiving the gas delivered by the gas supply pipeline of the external breathing machine and transmitting the gas to the humidification tank;

[0038] The humidification tank heats and humidifies the inflowing gas according to the pre-set temperature and humidity requirements, and the heated and humidified gas flows out through the gas outlet;

[0039] The gas outlet delivers the heated and humidified gas to the inhalation pipeline of the external breathing machine, so as to deliver the heated and humidified gas to the user interface through the inhalation pipeline;

[0040] The airflow direction detection module detects the flow direction of the gas at the gas outlet, and if the flow direction of the gas is from the inhalation pipeline of the breathing machine to the gas outlet, triggers the humidification tank to stop heating and perform automatic power-off protection;

[0041] The over-temperature early warning module determines whether the pre-set over-temperature early warning condition is met, and if so, triggers the humidification tank to stop heating and perform automatic power-off protection.

[0042] The determination of whether the pre-set over-temperature early warning condition is met comprises:

[0043] Real-time detection of the ambient temperature T env : calculation of T(t), if the calculated T(t) > T safe , it is determined that the pre-set over-temperature early warning condition is met; wherein T safe is a pre-set user safety temperature threshold;

[0044]

[0045] wherein, T(t) is the temperature of the gas at the user interface detected by the first temperature sensor at the current time t; T env is the ambient temperature at the current time t; P heat is the heating power of the humidification tank to the gas at the current time t; k loss is the heat loss coefficient; C total is the total heat capacity of the system, including the heat capacity of water and the container; T initial is the initial temperature of the water in the humidification tank; t

[0046] and / or,

[0047] measuring the ambient temperature in real time; judging whether the following inequality is true or not:

[0048]

[0049] if the inequality is true, it is determined that the pre-set over-temperature warning condition is met at present;

[0050] wherein, P heat is the heating power output by the humidification tank at the current time t; T env is the ambient temperature at the current time t; k loss is the heat loss coefficient; T safe is the pre-set user safety temperature threshold; C total is the total heat capacity of the system, including the heat capacity of water and the container; T initial is the initial temperature of the water in the humidification tank; t max is the maximum working time allowed by the medical humidifier in one power-on.

[0051] It can be seen that, in the embodiments of the present application, if it is judged that the pre-set over-temperature warning condition is met at present during the process of heating and humidifying the gas by the medical humidifier, the humidification tank is triggered to stop heating, and automatic power-off protection is performed, so as to prevent the medical humidifier from being damaged, and prevent the user from being injured by high temperature, thereby greatly improving the safety of the medical humidifier. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0053] Figure 1is a schematic diagram of an application scenario of a medical humidifier.

[0054] Figure 2 is a structural schematic diagram of a medical humidifier in an embodiment of the present application.

[0055] Figure 3 is a schematic diagram of performing airflow direction detection in a medical humidifier in an embodiment of the present application.

[0056] Figure 4 is a structural schematic diagram of an airflow direction detection module in an embodiment of the present application.

[0057] Figure 5 is a structural schematic diagram of an over-temperature early warning module in an embodiment of the present application.

[0058] Figure 6 is a flowchart of an over-temperature gas early warning method of a medical humidifier in an embodiment of the present application. DETAILED DESCRIPTION

[0059] The scheme provided by the present application is described below with reference to the drawings.

[0060] First of all, it should be noted that the terms used in the embodiments of the present application are merely for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0061] It should be understood that the term "and / or" used herein is merely to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0062] Figure 2 is a structural schematic diagram of a medical humidifier in an embodiment of the present application. Referring to Figure 2 In an embodiment of the present application, the medical humidifier comprises: an air inlet 101, a humidification tank 102, an air outlet 103, an over-temperature early warning module 105, and an airflow direction detection module 104; wherein,

[0063] The air inlet 101 is used to receive the gas delivered by the gas supply pipeline of the external breathing machine and transmit the gas to the humidification tank 102;

[0064] The humidification tank 102 is used to heat and humidify the inflowing gas according to the predetermined temperature and humidity requirements, and the heated and humidified gas flows out through the air outlet 103;

[0065] The gas outlet 103 is used to deliver the heated and humidified gas to the inspiratory pipeline of the external breathing machine, so as to deliver the heated and humidified gas to the user interface through the inspiratory pipeline;

[0066] The airflow direction detection module 104 is in communication with the gas outlet 103, and is used to detect the flow direction of the gas at the gas outlet 103, if the flow direction of the gas is from the inspiratory pipeline of the breathing machine to the gas outlet 103, the humidification tank 102 is triggered to stop heating, and automatic power-off protection is performed;

[0067] The over-temperature early warning module 105 is used to determine whether the pre-set over-temperature early warning condition is met at present, if yes, the humidification tank 102 is triggered to stop heating, and automatic power-off protection is performed.

[0068] It can be seen that in the embodiment of the present application, if it is determined that the pre-set over-temperature early warning condition is met in the process of heating and humidifying the gas by the medical humidifier, the humidification tank 102 is triggered to stop heating, and automatic power-off protection is performed, so as to prevent the medical humidifier from being damaged, and prevent the user from being injured by high temperature, thereby greatly improving the safety of the medical humidifier.

[0069] In actual application scenarios, due to the failure of the medical humidifier (such as the damage of the pipeline of the medical humidifier) or the abnormality of the external environment (such as the failure of the breathing machine or the occurrence of the user's large mouth breathing, etc.), the phenomenon of gas backflow may occur, if the gas backflow occurs, that is, the flow direction of the gas is from the inspiratory pipeline of the breathing machine to the gas outlet of the medical humidifier, the medical humidifier may be damaged, resulting in the failure of the medical humidifier, or the user may be in an abnormal situation at present, which needs to be handled. Therefore, in the embodiment of the present application, the medical humidifier further comprises an airflow direction detection module 104, through which the direction of the gas flow can be detected, if the flow direction of the gas is from the inspiratory pipeline of the breathing machine to the gas outlet 103, the humidification tank 102 is triggered to stop heating, and automatic power-off protection is performed, so as to prevent the medical humidifier from being damaged, and prevent the user from being injured when the airflow direction is abnormal, thereby greatly improving the safety of the medical humidifier. Further, when the airflow direction is abnormal, the management personnel can be reminded to handle through voice alarm.

[0070] In one embodiment of the present application, referring to Figure 3 and Figure 4 , one scheme for realizing airflow direction detection is as follows:

[0071] The airflow direction detection module 104 comprises: a first heating element and a second heating element symmetrically arranged at both ends of the air outlet 103 (for example, at the same height at both ends of the air outlet 103); a first temperature sensor connected to the two heating elements respectively; and a comparison submodule;

[0072] The first heating element is located at a first port of the air outlet, which is a port of the air outlet close to the humidification tank;

[0073] The second heating element is located at a second port of the air outlet, which is a port of the air outlet close to the inspiratory pipeline of the breathing machine;

[0074] The comparison submodule is configured to obtain the temperatures of the first heating element and the second heating element through the first temperature sensor, and if the temperature of the first heating element is higher than the temperature of the second heating element, it is determined that the flow direction of the gas is from the inspiratory pipeline of the breathing machine to the air outlet, and the humidification tank 102 is triggered to stop heating and perform automatic power-off protection.

[0075] For example, referring to Figure 3 , the first heating element is located at a position shown by point H1 on the air outlet 103, and the second heating element is located at a position shown by point H2 on the air outlet 103. If the flow direction of the gas is from right to left in the figure, that is, from the inspiratory pipeline of the breathing machine to the air outlet 103, since the flow direction of the gas is first through the second heating element at point H2 and then through the first heating element at point H1, the cooling of the second heating element at point H2 is more obvious, and the temperature of the first heating element is higher than that of the second heating element, so the humidification tank 102 is triggered to stop heating and perform automatic power-off protection. If the flow direction of the gas is from left to right in the figure, that is, from the air outlet 103 to the inspiratory pipeline of the breathing machine, that is, the flow of the gas under the normal working model of the medical humidifier, the cooling of the first heating element at point H1 is more obvious, and the temperature of the first heating element is lower than that of the second heating element, so the humidification tank 102 is not triggered to stop heating, and automatic power-off protection is not needed.

[0076] In an embodiment of the present application, the heating element can be a platinum resistance or a thin-film heating resistance.

[0077] In the process of heating the gas, if the temperature of the gas exceeds a safe range, the equipment can be damaged or the user can be in danger. In order to prevent this situation, a pre-warning of the over-temperature gas is needed. In an embodiment of the present application, in order to detect and pre-warn the over-temperature gas, referring to Figure 5 , the over-temperature pre-warning module 105 comprises: a power-off triggering module and a calculation module;

[0078] The computing module is configured to determine in real time whether the preset over-temperature early warning condition is met currently.

[0079] The power-off triggering module is configured to trigger the humidification tank to stop heating and perform automatic power-off protection when the computing module determines that the preset over-temperature early warning condition is met currently.

[0080] In an embodiment of the present application, for over-temperature protection of the medical humidifier, not only the temperature of the gas delivered to the user interface is considered. If the over-temperature early warning condition only considers the temperature of the gas, when the temperature of the gas at the user interface is greater than the preset user safety temperature threshold, such as 40℃, it is considered that the over-temperature early warning condition is met, which is not accurate enough. For example, when the temperature sensor for measuring the temperature of the gas at the user interface is damaged or the measurement accuracy of the temperature sensor is greatly reduced due to environmental factors (such as the medical humidifier being in an extremely cold or humid environment), it is not possible to more accurately determine whether the over-temperature early warning condition is met currently only according to the temperature. Since the medical humidifier has very high safety requirements, the over-temperature early warning cannot be performed only according to the temperature of the gas at the user interface measured by the temperature sensor. For another example, when the humidity of the surrounding environment is high, even if the temperature of the gas at the user interface is greater than the preset user safety temperature threshold, the user will not be harmed, just as when a person is in a sauna room with very high humidity, the human body will not feel uncomfortable even if the temperature exceeds 43℃.

[0081] In fact, the factors affecting the temperature of the gas inhaled by the user into the body are various, including not only the temperature of the heated gas, but also the ambient temperature, the volume of the water for humidification and the initial temperature of the water, the heat loss coefficient, etc. Therefore, in an embodiment of the present application, the over-temperature early warning condition is set from a multi-dimensional perspective and in combination with various factors, so that the over-temperature early warning condition can more accurately reflect the actual working state of the medical humidifier and ensure that the temperature of the gas inhaled by the user into the body is more in line with the physiological needs of the user.

[0082] In the embodiment of the present application, at least the following two ways can be used to determine whether the over-temperature early warning condition is met:

[0083] Method one, comparison of temperatures.

[0084] In this method one, referring to Figure 5 The second temperature sensor is further included in the over-temperature early warning module 105 and is configured to detect the ambient temperature in real time.

[0085] The computing module is configured to calculate T(t) according to the following calculation formula 1:

[0086]

[0087] T (t) = T (t-1) + (P (t) - P (t-1) ) * k * C * (T (t) - T (t-1) ) / (T (t) + T (t-1) ) / 2 env T (t) = T (t-1) + (P (t) - P (t-1) ) * k * C * (T (t) - T (t-1) ) / (T (t) + T (t-1) ) / 2 heat P (t) is the heating power output by the humidification tank at the current time t; k loss k is a heat loss coefficient; C total C is the total heat capacity of the system, including the heat capacity of water and the container; T initial T (t-1) is the initial temperature of the water in the humidification tank;

[0088] If the calculated T (t) > T safe , it is determined that the pre-set over-temperature warning condition is currently met; wherein T safe is the pre-set user safety temperature threshold.

[0089] As can be seen, in the embodiments of the present application, when the temperature of the gas delivered to the user interface rises too quickly over time, an early warning is given that the user safety temperature threshold has been exceeded. In the embodiments of the present application, when setting the over-temperature warning condition, the ambient temperature T env is taken into account, because if the ambient temperature differs too much from the pre-set user safety temperature threshold (such as in extremely cold or extremely hot conditions), it often leads to a sharp drop or rise in the temperature of the heated and humidified gas during transmission in the pipeline, and the gas after the sharp drop or rise in temperature is inhaled by the user, therefore, in the embodiments of the present application, the ambient temperature T env is taken into account when setting the over-temperature warning condition; and the ambient temperature affects the heat dissipation capacity of the medical humidifier, thereby affecting the temperature of the output gas. In the embodiments of the present application, the heating power P heat output by the humidification tank at the current time t is taken into account when setting the over-temperature warning condition, because the greater the heating power, the faster the temperature rises. In the embodiments of the present application, the heat loss coefficient k loss is taken into account when setting the over-temperature warning condition, because in the use of the medical humidifier, the heat insulation performance of the container needs to be considered, and the change in ambient temperature affects the heat dissipation efficiency. In the embodiments of the present application, the heat capacity of water c_water = m * p, wherein m is the mass of the water used to heat the gas, and p is the specific heat capacity of water, which can be 4.2 * 10 3 J / (kg·℃), the heat capacity of the container c_container is calculated according to the material of the humidification tank of the medical humidifier, and the total heat capacity C total of the system = c_water + c_container.

[0090] In the embodiment of the present application, referring to the calculation formula 1, when the ambient temperature rises, the critical heating power decreases, and it is easier to trigger the over-temperature early warning; the volume of the water used for heating in the humidifier is large, the heat capacity is large, the temperature rises slowly, and it needs a longer time or a higher heating power to trigger the over-temperature early warning.

[0091] The second method is to compare the powers.

[0092] In the second method, in an embodiment of the present application, the over-temperature early warning module further comprises a third temperature sensor for measuring the ambient temperature in real time.

[0093] The calculation module is configured to determine whether the following inequality is established in real time:

[0094]

[0095] If the inequality is established, it is determined that the pre-set over-temperature early warning condition is met at present.

[0096] P heat is the heating power output by the humidification tank at the current time t; T env is the ambient temperature at the current time t; k loss is the heat loss coefficient; T safe is the pre-set user safety temperature threshold; C total is the total heat capacity of the system, including the heat capacity of the water and the container; T initial is the initial temperature of the water in the humidification tank; t max is the maximum working time allowed by the medical humidifier in one power-on.

[0097] In the second method, if the current heating power P heat exceeds the sum of the heat dissipation capacity (the first term) and the power corresponding to the allowed temperature rise rate (the second term), it is determined that the pre-set over-temperature early warning condition is met at present.

[0098] In an embodiment of the present application, the power-off triggering module comprises a temperature fuse connected in series in the heating element circuit of the humidification tank 102. After the calculation module determines that the over-temperature occurs at present, the temperature fuse is fused, so that the humidification tank 102 stops heating and performs automatic power-off protection.

[0099] In an embodiment of the present application, the medical humidifier can adjust the humidity of the gas output to the user interface by adjusting the water level of the water used for humidification. At this time, the medical humidifier can further comprise a first humidity adjustment module and a float valve.

[0100] The first humidity adjustment module is configured to detect the humidity of the gas delivered to the user interface, and if the detected humidity value is greater than a pre-set user safety humidity threshold, lower the water level of the water for humidification in the container through the float valve; and if the detected humidity value is less than the pre-set user safety humidity threshold, raise the water level of the water for humidification in the container through the float valve.

[0101] In an embodiment of the present application, the medical humidifier can further comprise a second humidity adjustment module.

[0102] The second humidity adjustment module is configured to detect the humidity of the gas delivered to the user interface, and if the detected humidity value is greater than a pre-set user safety humidity threshold, reduce the heating power of the humidification tank for heating the gas; and if the detected humidity value is less than the pre-set user safety humidity threshold, increase the heating power of the humidification tank for heating the gas.

[0103] In an embodiment of the present application, the medical humidifier further comprises a metal heat-conducting disc or a heat sink.

[0104] The metal heat-conducting disc or the heat sink is arranged in the humidification tank, and is configured to accelerate the heat transfer in the humidification tank and prevent overheating of a local area in the humidification tank.

[0105] In an embodiment of the present application, a method for pre-warning of over-temperature gas of a medical humidifier is also provided, as shown in Figure 2 and Figure 6 The method comprises the following steps.

[0106] Step 601: receiving the gas delivered by the gas supply pipeline of an external breathing machine, and transmitting the gas to the humidification tank.

[0107] Step 603: the humidification tank heats and humidifies the inflowing gas according to a predetermined temperature and humidity requirement, and the heated and humidified gas flows out through the gas outlet.

[0108] Step 605: the gas outlet delivers the heated and humidified gas to the inhalation pipeline of the external breathing machine, so as to deliver the heated and humidified gas to the user interface through the inhalation pipeline.

[0109] Step 607: the airflow direction detection module detects the flow direction of the gas at the gas outlet, and if the flow direction of the gas is from the inhalation pipeline of the breathing machine to the gas outlet, triggers the humidification tank to stop heating and perform automatic power-off protection.

[0110] Step 609: the over-temperature pre-warning module determines whether a pre-set over-temperature pre-warning condition is met, and if yes, triggers the humidification tank to stop heating and perform automatic power-off protection.

[0111] In one embodiment of the present application, the step 609 of determining whether the preset over-temperature warning condition is met according to the temperature of the gas includes:

[0112] Real-time detection of the ambient temperature:

[0113] Calculation of T(t):

[0114]

[0115] wherein T(t) is the temperature of the gas delivered to the user interface at the current time t; T env is the ambient temperature at the current time t; P heat is the heating power output by the humidification tank at the current time t; k loss is the heat loss coefficient; C total is the total heat capacity of the system, including the heat capacity of the water and the container; T initial is the initial temperature of the water in the humidification tank; and t max is the maximum working time allowed for the medical humidifier in one power-on.

[0116] If the calculated T(t) > T safe , it is determined that the preset over-temperature warning condition is met at present; wherein T safe is the preset user safety temperature threshold.

[0117] In another embodiment of the present application, the step 609 of determining whether the preset over-temperature warning condition is met according to the temperature of the gas includes:

[0118] Real-time measurement of the ambient temperature; and determination of whether the following inequality is true:

[0119]

[0120] If the inequality is true, it is determined that the preset over-temperature warning condition is met at present;

[0121] wherein P heat is the heating power output by the humidification tank at the current time t; T env is the ambient temperature at the current time t; k loss is the heat loss coefficient; T safe is the preset user safety temperature threshold; C total is the total heat capacity of the system, including the heat capacity of the water and the container; T initial is the initial temperature of the water in the humidification tank; and t max is the maximum working time allowed for the medical humidifier in one power-on.

[0122] One embodiment of the present application provides a computer readable storage medium having a computer program stored thereon, which, when executed in a computer, causes the computer to perform the method in any one of the embodiments of the specification.

[0123] One embodiment of the present application provides a computing device comprising a memory and a processor, the memory having stored therein executable code which, when executed by the processor, implements a method according to any one of the embodiments described in the specification.

[0124] It can be understood that the structures shown in the embodiments of the present application do not constitute a specific limitation on the devices of the embodiments of the present application. In other embodiments of the specification, the above devices can include more or fewer components than shown, or combine certain components, or split certain components, or different component arrangements. The components shown can be implemented in hardware, software, or a combination of software and hardware.

[0125] Each of the embodiments of the present application is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the method embodiments, since they are basically similar to the device embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the device embodiments.

[0126] Those skilled in the art should be aware that functions described in the above one or more examples can be implemented in hardware, software, a plug-in, or any combination thereof. When implemented in software, the functions can be stored in a computer readable medium or transmitted as one or more instructions or codes on a computer readable medium.

[0127] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made on the basis of the technical solutions of the present application shall be included in the protection scope of the present application.

Claims

1. A medical humidifier, characterized in that, The medical humidifier comprises: an air inlet, a humidification tank, an air outlet, an over-temperature early warning module and an airflow direction detection module, wherein, The air inlet is configured to receive gas delivered by a gas supply pipeline of an external breathing machine and transmit the gas to the humidification tank; The humidification tank is configured to heat and humidify the inflowing gas according to predetermined temperature and humidity requirements, and the heated and humidified gas flows out through the air outlet; The air outlet is configured to deliver the heated and humidified gas to an inhalation pipeline of the external breathing machine, so as to deliver the heated and humidified gas to a user interface through the inhalation pipeline; The airflow direction detection module is in communication with the air outlet and is configured to detect the flow direction of the gas at the air outlet, and if the flow direction of the gas is from the inhalation pipeline of the breathing machine to the air outlet, the humidification tank is triggered to stop heating and perform automatic power-off protection; The over-temperature early warning module is configured to determine whether the preset over-temperature early warning condition is met at present, and if so, the humidification tank is triggered to stop heating and perform automatic power-off protection; The over-temperature early warning module comprises a power-off triggering module and a calculation module; The calculation module is configured to determine whether the preset over-temperature early warning condition is met at present in real time; The power-off triggering module is configured to trigger the humidification tank to stop heating and perform automatic power-off protection when the calculation module determines that the preset over-temperature early warning condition is met at present; The over-temperature early warning module further comprises a second temperature sensor configured to measure the ambient temperature in real time; The calculation module is configured to calculate T(t) according to the following first calculation formula: wherein T(t) is the temperature of the gas delivered to the user interface at the current time t; T env is the ambient temperature at the current time t; P heat is the heating power output by the humidification tank at the current time t; k loss is the thermal loss coefficient; C total is the total heat capacity of the system, including the heat capacity of the water and the container; T initial is the initial temperature of the water in the humidification tank; If the calculated T(t) > T safe , it is determined that the pre-set over-temperature warning condition is currently met; wherein T safe is a pre-set user safety temperature threshold.

2. A medical humidifier as claimed in claim 1, characterized in that The airflow direction detection module comprises first and second heating elements symmetrically arranged at both ends of the air outlet, a first temperature sensor connected to the two heating elements respectively, and a comparison submodule; The first heating element is located on a first port of the air outlet, which is a port of the air outlet close to the humidification tank; The second heating element is located on a second port of the air outlet, which is a port of the air outlet close to the inhalation pipeline of the breathing machine; The comparison submodule is configured to obtain the temperatures of the first and second heating elements through the first temperature sensor, and if the temperature of the first heating element is higher than that of the second heating element, it is determined that the flow direction of the gas is from the inhalation pipeline of the breathing machine to the air outlet, and the humidification tank is triggered to stop heating and perform automatic power-off protection.

3. The medical humidifier of claim 1, wherein The over-temperature early warning module further comprises a third temperature sensor configured to measure the ambient temperature in real time; The calculation module is configured to determine whether the following inequality is established in real time: If the inequality is established, it is determined that the preset over-temperature early warning condition is met at present; P = P0+ k (T - T0) + C (T - T0) + (T - T0) (1) heat P = P0+ k (T - T0) + C (T - T0) + (T - T0) (1) env T0= T0+ k (T - T0) + C (T - T0) + (T - T0) (2) loss k = k + k (T - T0) + C (T - T0) + (T - T0) (3) safe C = C + k (T - T0) + C (T - T0) + (T - T0) (4) total C = C + k (T - T0) + C (T - T0) + (T - T0) (4) initial T0= T0+ k (T - T0) + C (T - T0) + (T - T0) (2) max T0= T0+ k (T - T0) + C (T - T0) + (T - T0) (2) 4. The medical humidifier of claim 1, wherein Further comprising: A first humidity adjustment module and a float valve; The first humidity adjustment module is configured to detect the humidity of the gas delivered to the user interface, and if the detected humidity value is greater than a pre-set user safety humidity threshold, to lower the water level of the water for humidification in the container through the float valve; and if the detected humidity value is less than the pre-set user safety humidity threshold, to raise the water level of the water for humidification in the container through the float valve.

5. The medical humidifier of claim 1, wherein Further comprising: a second humidity adjustment module; The second humidity adjustment module is configured to detect the humidity of the gas delivered to the user interface, and if the detected humidity value is greater than a pre-set user safety humidity threshold, to reduce the heating power of the humidification tank for heating the gas; and if the detected humidity value is less than the pre-set user safety humidity threshold, to increase the heating power of the humidification tank for heating the gas.

6. The medical humidifier of claim 1, wherein The medical humidifier further comprises a metal heat-conducting disc or a heat sink, which is arranged in the humidification tank to accelerate heat transfer in the humidification tank and prevent overheating in local areas in the humidification tank. And / or, The over-temperature early warning module comprises a temperature fuse connected in series in the heating element circuit of the humidification tank, which is fused when the over-temperature early warning module determines that the pre-set over-temperature early warning condition is met, so as to stop the humidification tank from heating and perform automatic power-off protection.

7. A method of warning of superheated gas applied to the medical humidifier according to any one of claims 1 to 6, characterized in that, The method comprises: receiving the gas delivered by the gas supply pipeline of the external breathing machine and transmitting the gas to the humidification tank; the humidification tank heating and humidifying the inflowing gas according to the pre-set temperature and humidity requirements, and the heated and humidified gas flowing out through the gas outlet; the gas outlet delivering the heated and humidified gas to the inhalation pipeline of the external breathing machine to deliver the heated and humidified gas to the user interface through the inhalation pipeline; a gas flow direction detection module detecting the flow direction of the gas at the gas outlet, and if the flow direction of the gas is from the inhalation pipeline of the breathing machine to the gas outlet, triggering the humidification tank to stop heating and perform automatic power-off protection; an over-temperature early warning module determining whether the pre-set over-temperature early warning condition is met, and if so, triggering the humidification tank to stop heating and perform automatic power-off protection; The over-temperature early warning module comprises a power-off triggering module and a calculation module. The calculation module is configured to determine in real time whether the pre-set over-temperature early warning condition is met. The power-off triggering module is configured to trigger the humidification tank to stop heating and perform automatic power-off protection when the calculation module determines that the pre-set over-temperature early warning condition is met. The over-temperature early warning module further comprises a second temperature sensor configured to measure the ambient temperature in real time. The determination of whether the pre-set over-temperature early warning condition is met comprises: calculating T(t), if the calculated T(t) > T safe , it is determined that the preset over-temperature warning condition is met at present; wherein, T safe is a preset user safety temperature threshold value; wherein T(t) is the temperature of the gas at the user interface detected at the current time t; T env is the ambient temperature at the current time t; P heat is the heating power of the humidification tank to the gas at the current time t; k loss is the heat loss coefficient; C total is the total heat capacity of the system, including the water and the heat capacity of the container; T initial is the initial temperature of the water in the humidification tank.

8. The method of claim 7, wherein the ambient temperature is measured in real time; The determination of whether the pre-set over-temperature early warning condition is met comprises: determining whether the following inequality is true: If the inequality is true, it is determined that the pre-set over-temperature early warning condition is met. P = P0+ k (T - T0) + C (T - T0) + (T - T0) (1) heat P = P0+ k (T - T0) + C (T - T0) + (T - T0) (1) env P = P0+ k (T - T0) + C (T - T0) + (T - T0) (1) loss P = P0+ k (T - T0) + C (T - T0) + (T - T0) (1) safe P = P0+ k (T - T0) + C (T - T0) + (T - T0) (1) total P = P0+ k (T - T0) + C (T - T0) + (T - T0) (1) initial P = P0+ k (T - T0) + C (T - T0) + (T - T0) (1) max P = P0+ k (T - T0) + C (T - T0) + (T - T0) (1)

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