Constant-temperature heating method for airway management equipment and airway management equipment

Abstract

The invention discloses a constant-temperature heating method for airway management equipment. The constant-temperature heating method comprises the following steps that the initial temperature, the target temperature, the flow speed and the pipeline cross section area of saline water are obtained; constructing a thermodynamic model, and calculating a heating current based on the thermodynamic model to obtain a relationship between the heating current and the saline water temperature rise degree; introducing a heat loss factor, correcting the thermodynamic model, and controlling the brine temperature to be stabilized in a target range according to a calculation result. The invention further discloses airway management equipment. According to the invention, the technical problems of inaccurate saline water temperature control and poor user comfort in airway management equipment are solved.

Description

Technical Field

[0001] This invention relates to the field of airway management equipment technology, and in particular to a constant temperature heating method for airway management equipment and an airway management equipment. Background Technology

[0002] Airway management devices are widely used in clinical medicine for procedures such as airway irrigation and sputum clearance. Currently, conventional airway management devices primarily clean the patient's airway through saline irrigation. However, existing technology has a significant drawback: a lack of precise control over the temperature of the irrigation saline solution. Before entering the patient's body, the saline solution is typically at the same temperature as the ambient temperature (approximately 20-25°C), while the internal temperature of the human body is approximately 37°C. When low-temperature saline solution comes into contact with the respiratory mucosa, it can trigger local vasoconstriction, leading to discomfort such as coughing and expectoration, which may, in severe cases, affect the treatment outcome.

[0003] In existing technologies, some medical devices attempt to heat liquids using simple heating devices, but none are optimized for the specific needs of airway management scenarios. Patent application CN202510914147.X discloses an infusion heating device, which heats slow-flowing intravenous infusions, and its control strategy adjusts the heating power solely based on the difference between the target temperature and the initial temperature, without considering dynamic factors such as liquid flow rate and heat loss. However, saline flushing in airway management is characterized by large flow rate fluctuations (controlled by a peristaltic pump) and significant heat loss from the tubing. Directly applying existing heating methods would lead to temperature control lag or overshoot, making it impossible to stably maintain the saline temperature within a comfortable range (35-37℃). Therefore, there is an urgent need to propose a constant-temperature heating method and airway management device to solve the technical problems of inaccurate saline temperature control and poor user comfort in airway management devices. Summary of the Invention

[0004] The main objective of this invention is to propose a constant temperature heating method and airway management device, aiming to solve the technical problems of inaccurate saline temperature control and poor user comfort in airway management devices.

[0005] To achieve the above objectives, the present invention provides a constant-temperature heating method for an airway management device, wherein the constant-temperature heating method for the airway management device includes the following steps:

[0006] S1. Obtain the initial temperature, target temperature, flow rate, and cross-sectional area of ​​the brine;

[0007] S2. Construct a thermodynamic model and calculate the heating current based on the thermodynamic model to obtain the relationship between the heating current and the temperature rise of the brine.

[0008] S3. Introduce a heat loss factor to modify the thermodynamic model, and control the brine temperature to remain stable within the target range based on the calculation results.

[0009] In one preferred embodiment, the mass of the brine is:

[0010]

[0011] in, For the quality of salt water, The flow rate of the salt water. This is the cross-sectional area of ​​the brine pipeline. The density of the salt water, For time.

[0012] One preferred embodiment is that the thermodynamic model is constructed in step S2, specifically as follows:

[0013]

[0014] in, For heating current, The resistance of the heating element. For time, The flow rate of the salt water. This is the cross-sectional area of ​​the brine pipeline. The density of the salt water, The specific heat capacity of the salt water is... For the target temperature, This is the current temperature of the brine.

[0015] In one preferred embodiment, the relationship between the heating current and the temperature rise of the brine is as follows:

[0016]

[0017] in, The number of temperature rises.

[0018] In one preferred embodiment, the heat loss factor is obtained through experimental calibration, specifically by measuring the ratio of actual heating power to theoretical heating power at different flow rates.

[0019] In one preferred embodiment, the heat loss factor is:

[0020]

[0021] in, It is the heat loss factor. Theoretical heating power, This represents the actual heating power.

[0022] An airway management device including the aforementioned constant temperature heating method, comprising:

[0023] The host end and the patient end tubing are connected; the host end is connected to the patient end tubing.

[0024] The host unit includes an MCU, a drive module, a power supply, and a peristaltic pump; the MCU is connected to the drive module, the power supply, and the peristaltic pump respectively; the drive module is connected to a heating component, the MCU is connected to a first sensor and a second sensor, and the peristaltic pump is connected to a saline tubing; the patient tubing includes a saline tubing and a heating component, a first sensor, and a second sensor installed on the saline tubing, the first sensor being used to detect the saline temperature before heating, and the second sensor being used to detect the saline temperature after heating.

[0025] In one preferred embodiment, the heating element is a heating wire.

[0026] In one preferred embodiment, the first temperature sensor and the second temperature sensor are respectively disposed at the front and rear ends of the area heated by the heating element.

[0027] In the above-described technical solution of the present invention, the constant-temperature heating method for the airway management device includes the following steps: obtaining the initial temperature, target temperature, flow rate, and cross-sectional area of ​​the brine; constructing a thermodynamic model and calculating the heating current based on the thermodynamic model to obtain the relationship between the heating current and the brine temperature rise rate; introducing a heat loss factor to correct the thermodynamic model, and controlling the brine temperature to remain stable within the target range based on the calculation results. The present invention solves the technical problems of inaccurate brine temperature control and poor user comfort in airway management devices. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a constant temperature heating method for an airway management device according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of an airway management device according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the brine pipeline according to an embodiment of the present invention.

[0032] The realization of the objective, functional characteristics and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0035] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0036] See Figure 1 According to one aspect of the present invention, a method for constant temperature heating of an airway management device is provided, wherein the method includes the following steps:

[0037] S1. Obtain the initial temperature, target temperature, flow rate, and cross-sectional area of ​​the brine;

[0038] S2. Construct a thermodynamic model and calculate the heating current based on the thermodynamic model to obtain the relationship between the heating current and the temperature rise of the brine.

[0039] S3. Introduce a heat loss factor to modify the thermodynamic model, and control the brine temperature to remain stable within the target range based on the calculation results.

[0040] Specifically, in this embodiment, intelligent temperature control is achieved by heating the brine, taking into account the flow characteristics of the brine, the power control of the heating wire, and related heating losses. Relevant data of the brine are acquired, including its specific heat capacity, initial temperature, target temperature, density, flow rate, and pipe cross-sectional area. The specific heat capacity of the brine is a fixed value. The initial temperature of the brine is measured by the first sensor and is T1. The target heating temperature of the brine is set to T0, and the actual temperature after heating is measured by the second sensor and is set to T2. The density of the brine can be obtained from a table or through experimental measurement. The flow rate of the brine can be controlled by adjusting the speed of the peristaltic pump. The volume of brine flowing per unit time is equal to the cross-sectional area multiplied by the flow rate, and the mass is equal to the volume of brine multiplied by the density of brine. The mass of the brine is:

[0041]

[0042] in, For the quality of salt water, The flow rate of the salt water. This is the cross-sectional area of ​​the brine pipeline. The density of the salt water, For time;

[0043] Calculate the heat generated by the heating element per unit time:

[0044]

[0045] in, The heat generated by the heating element;

[0046] From the specific heat capacity formula, we can obtain:

[0047]

[0048] The construction of the thermodynamic model in step S2 is specifically as follows:

[0049]

[0050] in, For heating current, The resistance of the heating element. For time, The flow rate of the salt water. This is the cross-sectional area of ​​the brine pipeline. The density of the salt water, The specific heat capacity of the salt water is... For the target temperature, This is the current temperature of the brine.

[0051] Specifically, in this embodiment, the relationship between the heating current and the temperature rise of the brine is as follows:

[0052]

[0053] in, The number of temperature rises.

[0054] Specifically, in this embodiment, the heat loss factor is obtained through experimental calibration, specifically by measuring the ratio of actual heating power to theoretical heating power at different flow rates. Since heat loss due to heat exchange and thermal radiation can be compensated for by experimental measurements, a heat loss factor is introduced. In this invention, the heat loss factor is less than 1 and is used to correct the heating power. The optimal value can be obtained by correcting the heat loss factor based on actual engineering measurements. The heat loss factor is:

[0055]

[0056] in, It is the heat loss factor. Theoretical heating power, This represents the actual heating power.

[0057] Specifically, in this embodiment, once the target brine temperature required by the user is known, the power of the heating component can be controlled based on the acquired temperature and flow rate information; the target temperature input by the user is acquired, the temperatures T1 and T2 of the first and second sensors are collected, and the brine flow rate is calculated according to the rinsing mode; when T1=T2, the current power is maintained, when T1<T2, the power of the heating component is increased, and vice versa, the power of the heating component is decreased.

[0058] See Figures 2-3 According to another aspect of the present invention, an airway management device is provided, comprising: a main unit and a patient-side tubing; the main unit is connected to the patient-side tubing.

[0059] The host unit includes an MCU, a drive module, a power supply, and a peristaltic pump; the MCU is connected to the drive module, the power supply, and the peristaltic pump respectively; the drive module is connected to the heating element, the MCU is connected to the first sensor and the second sensor, and the peristaltic pump is connected to the saline tubing; the patient tubing includes a saline tubing and a heating element, a first sensor, and a second sensor installed on the saline tubing. The first sensor is used to detect the saline temperature before heating, and the second sensor is used to detect the saline temperature after heating; wherein, the first sensor is NTC1, and the second sensor is NTC2.

[0060] Specifically, in this embodiment, the heating element is a heating wire.

[0061] Specifically, in this embodiment, the first temperature sensor and the second temperature sensor are respectively disposed at the front and rear ends of the area heated by the heating component.

[0062] Specifically, in this embodiment, the above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for constant temperature heating of an airway management device, characterized in that, Includes the following steps: S1. Obtain the initial temperature, target temperature, flow rate, and cross-sectional area of ​​the brine; S2. Construct a thermodynamic model and calculate the heating current based on the thermodynamic model to obtain the relationship between the heating current and the temperature rise of the brine. S3. Introduce a heat loss factor to modify the thermodynamic model, and control the brine temperature to remain stable within the target range based on the calculation results.

2. The constant temperature heating method for an airway management device according to claim 1, characterized in that, The mass of the salt water is: ； in, For the quality of salt water, The flow rate of the salt water. This is the cross-sectional area of ​​the brine pipeline. The density of the salt water, For time.

3. A constant-temperature heating method for an airway management device according to any one of claims 1-2, characterized in that, The construction of the thermodynamic model in step S2 is specifically as follows: ； in, For heating current, The resistance of the heating element. For time, The flow rate of the salt water. This is the cross-sectional area of ​​the brine pipeline. The density of the salt water, The specific heat capacity of salt water. For the target temperature, This is the current temperature of the brine.

4. The constant temperature heating method for an airway management device according to claim 3, characterized in that, The relationship between the heating current and the temperature rise rate of the brine is as follows: ； in, The number of temperature rises.

5. A constant-temperature heating method for an airway management device according to any one of claims 1-2, characterized in that, The heat loss factor was obtained through experimental calibration, specifically by measuring the ratio of actual heating power to theoretical heating power at different flow rates.

6. The constant temperature heating method for an airway management device according to claim 5, characterized in that, The heat loss factor is: ； in, It is the heat loss factor. Theoretical heating power This represents the actual heating power.

7. An airway management device comprising the constant-temperature heating method for an airway management device according to any one of claims 1-6, characterized in that, include: The host end and the patient end tubing are connected; the host end is connected to the patient end tubing. The host unit includes an MCU, a drive module, a power supply, and a peristaltic pump; the MCU is connected to the drive module, the power supply, and the peristaltic pump respectively; the drive module is connected to a heating component, the MCU is connected to a first sensor and a second sensor, and the peristaltic pump is connected to a saline tubing; the patient tubing includes a saline tubing and a heating component, a first sensor, and a second sensor installed on the saline tubing, the first sensor being used to detect the saline temperature before heating, and the second sensor being used to detect the saline temperature after heating.

8. An airway management device comprising the constant temperature heating method for an airway management device as described in claim 7, characterized in that, The heating element is a heating wire.

9. An airway management device comprising the constant temperature heating method for an airway management device as described in claim 7, characterized in that, The first temperature sensor and the second temperature sensor are respectively located at the front and rear ends of the area heated by the heating element.

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