Human body core temperature monitoring method based on two-channel heat flow principle

Abstract

The invention provides a human body core temperature monitoring method based on a double-channel heat flow principle, which comprises the following steps: acquiring temperature data acquired by an integrated temperature measurement probe which comprises an active heating source and a plurality of temperature sensors, and calculating core temperature through the double-channel heat flow principle; temperature data are processed through a filtering algorithm, probe temperature is adjusted through an active heating source, probe and human body heat balance is accelerated to shorten response time, and core temperature is output through a display module. An integrated probe structure is adopted, heat conduction performance is optimized by doping calcium carbonate, and temperature compensation and data filtering algorithms are combined, so that heat balance time is shortened, precision is improved, miniaturization is achieved, and clinical application of a noninvasive core temperature monitoring technology is promoted.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of information technology, and in particular to a human core temperature monitoring method based on a double-channel heat flow principle. BACKGROUND

[0002] Accurate monitoring of human core temperature is of great significance in clinical diagnosis and daily health management. Traditional invasive temperature measurement methods (such as rectal and esophageal temperature measurement) have high accuracy, but they have the risk of infection, are complex to operate, and have poor patient experience. Non-invasive temperature measurement techniques have gradually become a research hotspot, mainly including special site substitution methods and heat flow principle estimation methods.

[0003] Special site substitution methods (such as cochlear infrared temperature measurement, infrared thermal imaging, and ultrasonic temperature measurement) indirectly measure the core temperature by measuring the body surface temperature, but they are susceptible to environmental interference and have limited accuracy. For example, ear thermometers are affected by the structure of the ear canal, infrared thermal imaging has insufficient resolution, magnetic resonance temperature measurement equipment is expensive, and capsule temperature measurement is costly and cannot be reused.

[0004] Heat flow principle estimation methods have more potential as they derive core temperature through thermodynamic models. Among them:

[0005] 1. Zero heat flow temperature measurement requires long-term insulation, and the device is large in size and high in power consumption;

[0006] 2. Single-channel heat flow principle temperature measurement relies on individual skin thermal resistance parameters, and has poor universality;

[0007] 3. Double-channel heat flow principle temperature measurement avoids skin thermal resistance measurement, but has a long heat balance time (about 23.5 minutes) and is susceptible to environmental temperature;

[0008] 4. Three-channel heat flow principle temperature measurement accelerates response through multiple heat transfer units, but the probe structure is complex and lacks comfort.

[0009] In summary, existing heat flow temperature measurement methods still have problems such as large probe size, slow response speed, and sensitivity to environmental interference. SUMMARY

[0010] The present application aims to solve the problems of large probe size, slow response speed, and sensitivity to environmental interference in existing heat flow temperature measurement methods. A human core temperature monitoring method and system based on a double-channel heat flow principle is proposed, which uses an integrated probe structure, optimizes heat conduction performance by doping calcium carbonate, and combines temperature compensation and data filtering algorithms to shorten the heat balance time, improve accuracy, and achieve miniaturization, thereby promoting the clinical application of non-invasive core temperature monitoring technology.

[0011] The technical solution of the present application is:

[0012] This invention provides a method for monitoring human core temperature based on the dual-channel heat flow principle, comprising the following steps:

[0013] S1. Acquire temperature data collected by the integrated temperature probe, which includes an active heating source and multiple temperature sensors, and calculates the core temperature through the dual-channel heat flow principle.

[0014] S2. Temperature data is processed using a filtering algorithm, and the probe temperature is adjusted by an active heating source to accelerate the thermal balance between the probe and the human body to shorten the response time. The core temperature is output through the display module.

[0015] Furthermore, the integrated temperature probe includes:

[0016] Two cylindrical heat transfer material blocks, consisting of a first cylindrical heat transfer material block and a second cylindrical heat transfer material block, are concentrically arranged to form two heat flow channels for collecting temperature values; the height of the first cylindrical heat transfer material block is greater than the height of the second cylindrical heat transfer material block, forming a convex structure.

[0017] Two sets of temperature sensors are provided, consisting of a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor. The first and second temperature sensors are arranged in pairs and embedded in the bottom and top of the first cylindrical heat transfer material block. The third and fourth temperature sensors are arranged in pairs and embedded in the bottom and top of the second cylindrical heat transfer material block.

[0018] An active heating source, employing a heating element, is embedded in the top of the second cylindrical heat transfer material block and located on the opposite side of the fourth temperature sensor;

[0019] And a heat insulation layer, which is set on the upper surface of the two cylindrical heat transfer material blocks.

[0020] Furthermore, the heat insulation cover uses glass wool material to reduce external heat flow disturbance; the two cylindrical heat transfer material blocks use PDMS material, and the PDMS material is uniformly doped with calcium carbonate powder to improve the thermal conductivity.

[0021] Furthermore, the ratio of the height h1 of the first cylindrical heat transfer material block to the height h2 of the second cylindrical heat transfer material block is 1.5 to 2.5;

[0022] The ratio of the radius r1 of the first cylindrical heat transfer material block to the radius r2 of the second cylindrical heat transfer material block is 0.3 to 0.5.

[0023] Furthermore, the first temperature sensor and the second temperature sensor are located on the perpendicular bisector of the center of the first cylindrical heat transfer material block; the third temperature sensor and the fourth temperature sensor are located on the perpendicular bisector of the center of the second cylindrical heat transfer material block.

[0024] The distance L between the third temperature sensor and the first temperature sensor is (r1+r2) / 2; where r1 and r2 represent the radii of the first cylindrical heat transfer material block and the second cylindrical heat transfer material block, respectively.

[0025] Furthermore, in S1, the calculation of the core temperature using the dual-channel heat flow principle includes:

[0026] Temperature data T1 and T2 are obtained using a first temperature sensor and a second temperature sensor, and are used as the temperature of the first heat flow channel.

[0027] Temperature data T3 and T4 are obtained using a third temperature sensor and a fourth temperature sensor, and are used as the temperature of the second heat flow channel.

[0028] Based on the temperatures and thermal resistance ratios of the first and second heat flow channels, the heat flow equations are combined to eliminate the influence of thermal resistance of skin tissue, and the core temperature Tcore is determined using the following formula.

[0029]

[0030] Furthermore, the temperature data processing using the filtering algorithm described in S2 includes:

[0031] Multiple temperature values ​​collected by the probe are acquired, mean filtering is applied to eliminate noise interference, and the core temperature Tcore is calculated using the dual-channel heat flow principle.

[0032] The core temperature Tcore is corrected in real time using Kalman filtering and minimum gradient environmental adaptive filtering algorithms.

[0033] Furthermore, the application is based on a minimum gradient-based environment adaptive filtering algorithm, including:

[0034] Acquire ambient temperature change data to determine the initial values ​​of the filtering parameters;

[0035] Based on the minimum gradient algorithm, the filtering parameters are dynamically adjusted to adapt to environmental disturbances and generate a smooth temperature curve.

[0036] Furthermore, the adjustment of the probe temperature by an active heating source as described in S2 specifically refers to:

[0037] Acquire the initial temperature data of the integrated temperature probe and determine the heating power of the active heating source to accelerate the thermal equilibrium between the probe and the human body;

[0038] The system monitors the thermal balance and dynamically adjusts the heating power of the active heating source according to temperature changes. When the thermal balance reaches a stable state, heating is stopped to maintain temperature measurement accuracy.

[0039] The beneficial effects of this invention are:

[0040] This invention discloses a portable human core temperature monitoring method based on the dual-channel heat flow principle. It addresses the needs for high precision, rapid response, and environmental adaptability in home health monitoring, sports scenarios, and medical emergency care, and solves the problems of long response time, susceptibility to environmental interference, and insufficient comfort during long-term wear of traditional temperature measurement devices.

[0041] This invention utilizes an integrated temperature probe, combined with an active heating source and four high-precision temperature sensors. It optimizes heat conduction by using PDMS material doped with calcium carbonate powder, and combines it with a glass wool insulation layer to shield against external interference, significantly improving heat transfer efficiency and anti-interference capability.

[0042] In this invention, data processing employs mean filtering, Kalman filtering, and environmental adaptive filtering algorithms to effectively reduce noise and ensure that the core temperature calculation error is controlled within ±0.02 degrees Celsius. The active heating source dynamically adjusts its power, shortening the thermal equilibrium time by approximately 40% and reducing the response time to less than 13 minutes. This achieves high-precision, fast-response, and environmentally adaptable core temperature monitoring, significantly improving portability and user experience, and making it suitable for real-time body temperature monitoring in dynamic environments.

[0043] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0044] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0045] Figure 1 A flowchart of the human core temperature monitoring method based on the dual-channel heat flow principle of the present invention is shown.

[0046] Figure 2 A schematic diagram of an integrated temperature probe according to an embodiment of the present invention is shown.

[0047] In the figure, 1. First cylindrical heat transfer material block; 2. Second cylindrical heat transfer material block; 3. First temperature sensor; 4. Second temperature sensor; 5. Third temperature sensor; 6. Fourth temperature sensor; 7. Heat insulation layer; 8. Heating element. Detailed Implementation

[0048] Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0049] Figure 1 A flowchart of the human core temperature monitoring method based on the dual-channel heat flow principle of the present invention is shown.

[0050] like Figure 1 As shown, this invention provides a method for monitoring the core temperature of the human body based on the principle of dual-channel heat flow, comprising the following steps:

[0051] S1. Acquire temperature data collected by the integrated temperature probe, which includes an active heating source and multiple temperature sensors, and calculates the core temperature through the dual-channel heat flow principle.

[0052] S2. The temperature data is processed using a filtering algorithm, and the probe temperature is adjusted by an active heating source to accelerate the thermal balance between the probe and the human body to shorten the response time. The core temperature is output through the display module.

[0053] Specifically, this includes: S21, acquiring multiple temperature values ​​collected by the probe, applying mean filtering to eliminate noise interference, and calculating the core temperature Tcore using the dual-channel heat flow principle; and using Kalman filtering and minimum gradient environmental adaptive filtering algorithms to correct the core temperature Tcore in real time.

[0054] S22. Acquire the initial temperature data of the integrated temperature probe, determine the heating power of the active heating source to accelerate the thermal equilibrium between the probe and the human body; monitor the thermal equilibrium state, dynamically adjust the heating power of the active heating source according to temperature changes, and stop heating when the thermal equilibrium reaches stability to maintain temperature measurement accuracy.

[0055] In this embodiment, the collected temperature data is first processed by mean filtering, averaging the temperature values ​​from multiple consecutive sampling points to eliminate random noise interference and ensure smooth and reliable data. Subsequently, a Kalman filter algorithm is applied to update and correct the temperature predictions, thereby obtaining a more accurate core temperature estimate. Heating requirements are then determined based on the processed temperature data. For example, the processed temperature data is compared with a preset thermal equilibrium threshold. If the probe temperature is below a certain range of human skin temperature, the heating power requirement is calculated, and the required heat input is obtained by multiplying the temperature difference by the heat capacity coefficient. An active heating source is activated to regulate the temperature, rapidly raising the probe temperature to near human body temperature and accelerating the establishment of thermal equilibrium within the heat flow channel. The temperature sensor readings inside the probe are monitored in real time. Once the temperature gradient stabilizes, the heating power is gradually reduced until the heating source is turned off.

[0056] In one embodiment, for scenarios with low ambient temperatures, active heating reduces the response time to less than 13 minutes. The beneficial effect is that it significantly improves the timeliness of measurement, is suitable for portable monitoring devices, and avoids user discomfort caused by long waiting times.

[0057] In one example, such asFigure 2 The diagram shown is a structural schematic of an integrated temperature probe, including:

[0058] Two cylindrical heat transfer material blocks, consisting of a first cylindrical heat transfer material block 1 and a second cylindrical heat transfer material block 2, are concentrically arranged to form two heat flow channels for collecting temperature values; the height of the first cylindrical heat transfer material block 1 is greater than the height of the second cylindrical heat transfer material block 2, forming a convex structure.

[0059] Two sets of temperature sensors are provided, consisting of a first temperature sensor 3, a second temperature sensor 4, a third temperature sensor 5, and a fourth temperature sensor 6. The first temperature sensor 3 and the second temperature sensor 4 are arranged in pairs and embedded in the bottom and top of the first cylindrical heat transfer material block 1. The third temperature sensor 5 and the fourth temperature sensor 6 are arranged in pairs and embedded in the bottom and top of the second cylindrical heat transfer material block 2.

[0060] An active heating source is provided, which employs a heating element 8, embedded in the top of the second cylindrical heat transfer material block 2, and located on the opposite side of the fourth temperature sensor 6.

[0061] And a heat insulation layer 7, which is disposed on the upper surface of the two cylindrical heat transfer material blocks.

[0062] In this embodiment, the heat insulation cover 7 is made of glass wool to reduce external heat flow disturbance; the two cylindrical heat transfer material blocks are made of PDMS material, and the PDMS material is uniformly doped with calcium carbonate powder to improve the thermal conductivity.

[0063] In this embodiment, this convex-shaped structure achieves an integrated design through concentric arrangement, avoiding the uneven heat flow problem of separate structures and ensuring stable heat transfer from the human body to the sensor. For example, the formation process of the convex-shaped structure includes designing a first cylindrical heat transfer material block as a cylinder with a height of 8mm and a radius of 25mm, and a second cylindrical heat transfer material block as a cylinder with a height of 4mm and a radius of 10mm, placed concentrically, with the first cylinder surrounding the outer wall of the second cylinder to form an overall convex shape. This design helps reduce lateral heat flow interference, improves measurement consistency, shortens response time when measuring at the forehead position, and controls the error within ±0.02 degrees Celsius.

[0064] Furthermore, the ratio of the height h1 of the first cylindrical heat transfer material block to the height h2 of the second cylindrical heat transfer material block is 8:4; the ratio of the radius r1 of the first cylindrical heat transfer material block to the radius r2 of the second cylindrical heat transfer material block is 10:25.

[0065] In this embodiment, the error is relatively minimal when the height ratio is 2:1, and the response is fastest when the height ratio is 6:3, but there is some fluctuation. The larger the size, the slower the response and the more obvious the fluctuation. Therefore, the height ratio of 8:4 is selected, which is beneficial for medical monitoring with high accuracy requirements. As the radius increases, the transient response time does not change significantly, and the steady-state error is minimized at 25:10. The final size is determined as follows: h1:

[0066] h2 = 8:4; r1:r2 = 10:25.

[0067] Furthermore, the first temperature sensor 3 and the second temperature sensor 4 are located on the perpendicular bisector of the center of the first cylindrical heat transfer material block 1; the third temperature sensor 5 and the fourth temperature sensor 6 are located on the perpendicular bisector of the center of the second cylindrical heat transfer material block 2; the distance between the third temperature sensor 5 and the first temperature sensor 3 is L = (r1 + r2) / 2.

[0068] Furthermore, the calculation of core temperature using the dual-channel heat flow principle described in S1 includes:

[0069] Temperature data T1 and T2 are acquired using a first temperature sensor 3 and a second temperature sensor 4, and are used as the temperature of the first heat flow channel.

[0070] Temperature data T3 and T4 are obtained using the third temperature sensor 5 and the fourth temperature sensor 6, and are used as the temperature of the second heat flow channel.

[0071] Based on the temperatures and thermal resistance ratios of the first and second heat flow channels, the heat flow equations are combined to eliminate the influence of thermal resistance of skin tissue, and the core temperature Tcore is determined using the following formula.

[0072]

[0073] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for monitoring the core temperature of the human body based on the principle of dual-channel heat flow, characterized in that... Includes the following steps: S1. Acquire temperature data collected by the integrated temperature probe, which includes an active heating source and multiple temperature sensors, and calculates the core temperature through the dual-channel heat flow principle. S2. Temperature data is processed using a filtering algorithm, and the probe temperature is adjusted by an active heating source to accelerate the thermal balance between the probe and the human body to shorten the response time. The core temperature is output through the display module.

2. The method for monitoring human core temperature based on the dual-channel heat flow principle as described in claim 1, characterized in that... The integrated temperature probe includes: Two cylindrical heat transfer material blocks are formed by a first cylindrical heat transfer material block (1) and a second cylindrical heat transfer material block (2) and are arranged concentrically to form two heat flow channels for collecting temperature values; the height of the first cylindrical heat transfer material block (1) is greater than the height of the second cylindrical heat transfer material block (2), forming a convex structure. Two sets of temperature sensors are composed of a first temperature sensor (3), a second temperature sensor (4), a third temperature sensor (5) and a fourth temperature sensor (6). The first temperature sensor (3) and the second temperature sensor (4) are set in pairs and embedded in the bottom and top of the first cylindrical heat transfer material block (1). The third temperature sensor (5) and the fourth temperature sensor (6) are set in pairs and embedded in the bottom and top of the second cylindrical heat transfer material block (2). An active heating source is provided, which employs a heating element (8) embedded in the top of the second cylindrical heat transfer material block (2) and located on the opposite side of the fourth temperature sensor (6). And a heat insulation layer (7) is provided on the upper surface of the two cylindrical heat transfer material blocks.

3. The method for monitoring human core temperature based on the dual-channel heat flow principle as described in claim 2, characterized in that, The heat insulation cover (7) is made of glass wool to reduce external heat flow disturbance; the two cylindrical heat transfer material blocks are made of PDMS material, and the PDMS material is uniformly doped with calcium carbonate powder to improve the thermal conductivity.

4. The method for monitoring human core temperature based on the dual-channel heat flow principle as described in claim 2, characterized in that, The ratio of the height h1 of the first cylindrical heat transfer material block (1) to the height h2 of the second cylindrical heat transfer material block (2) is 1.5 to 2.

5. The ratio of the radius r1 of the first cylindrical heat transfer material block (1) to the radius r2 of the second cylindrical heat transfer material block (2) is 0.3 to 0.

5.

5. The method for monitoring human core temperature based on the dual-channel heat flow principle as described in claim 2, characterized in that, The first temperature sensor (3) and the second temperature sensor (4) are located on the perpendicular bisector of the center of the first cylindrical heat transfer material block (1); the third temperature sensor (5) and the fourth temperature sensor (6) are located on the perpendicular bisector of the center of the second cylindrical heat transfer material block (2). The distance L between the third temperature sensor (5) and the first temperature sensor (3) is = (r1+r2) / 2; where r1 and r2 represent the radii of the first cylindrical heat transfer material block (1) and the second cylindrical heat transfer material block (2), respectively.

6. The method for monitoring human core temperature based on the dual-channel heat flow principle as described in claim 2, characterized in that... In S1, the calculation of the core temperature using the dual-channel heat flow principle includes: Temperature data T1 and T2 are obtained using a first temperature sensor (3) and a second temperature sensor (4) and used as the temperature of the first heat flow channel; Temperature data T3 and T4 are obtained using a third temperature sensor (5) and a fourth temperature sensor (6) and used as the temperature of the second heat flow channel; Based on the temperatures and thermal resistance ratios of the first and second heat flow channels, the heat flow equations are combined to eliminate the influence of thermal resistance of skin tissue, and the core temperature Tcore is determined using the following formula.

7. The method for monitoring human core temperature based on the dual-channel heat flow principle as described in claim 1, characterized in that... In S2, the temperature data processing using the filtering algorithm includes: Multiple temperature values ​​collected by the probe are acquired, mean filtering is applied to eliminate noise interference, and the core temperature Tcore is calculated using the dual-channel heat flow principle. The core temperature Tcore is corrected in real time using Kalman filtering and minimum gradient environmental adaptive filtering algorithms.

8. The method for monitoring human core temperature based on the dual-channel heat flow principle as described in claim 7, characterized in that, The application is based on a minimum gradient environment adaptive filtering algorithm, including: Acquire ambient temperature change data to determine the initial values ​​of the filtering parameters; Based on the minimum gradient algorithm, the filtering parameters are dynamically adjusted to adapt to environmental disturbances and generate a smooth temperature curve.

9. The method for monitoring human core temperature based on the dual-channel heat flow principle as described in claim 1, characterized in that... In S2, the adjustment of the probe temperature by the active heating source specifically refers to: Acquire the initial temperature data of the integrated temperature probe and determine the heating power of the active heating source to accelerate the thermal equilibrium between the probe and the human body; The system monitors the thermal balance and dynamically adjusts the heating power of the active heating source according to temperature changes. When the thermal balance reaches a stable state, heating is stopped to maintain temperature measurement accuracy.

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