Isothermal Zone Control Method for Multi-Ring Grid Heaters Based on Radial Thermal Compensation
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-08
- Publication Date
- 2026-08-14
AI Technical Summary
[0008]本发明的目的是提供基于径向热补偿的多环网格加热器的等温区控制方法，以解决现有单一加热轨迹线技术中径向热损失导致等温区建立缓慢、温度梯度大的问题
[0055]（1）通过将加热器划分为中心加热区与外围多环分区加热区，并采用正交网格基准阵列与同心环状基准区空间交叠投影的设计，构建了深度的空间解耦加热网络。外围多环区在径向由内向外呈现热损失梯度补偿结构（内密外疏），能够精准抵消中心区域向外围皮肤及外界环境的径向热扩散，从根本上消除了横向热传导对核心温度测量的干扰，在中心区正下方快速且稳定地构建出高纯度的核心等温核，实现对深体核温度的非侵入式、高精度、高稳定性测量。通过快速建立阶段与维持优化阶段的分步实施，完美解决加热速度与温度平稳度之间的矛盾：
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Figure CN122556925A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical body temperature monitoring and control technology, specifically to an isothermal zone control method for a multi-ring grid heater based on radial thermal compensation. Background Technology
[0002] Existing zero-heat-flux core temperature monitoring technology involves placing a sensor on the surface of the forehead skin and using a resistive heating circuit inside the sensor to slowly heat the skin, creating an isothermal zone below the sensor. This blocks heat loss from the skin to the external environment, allowing the skin surface temperature to gradually approach the core temperature of the deep tissues, thus achieving non-invasive core temperature measurement.
[0003] Taking the 3M-370 temperature monitoring and control device as an example, it includes a temperature sensor, sensor cable, control device and power supply. The temperature sensor adopts double-layer medical-grade foam and flexible circuit, including a resistance heating circuit, two calibrated thermistors and non-volatile memory. The control device achieves heating balance through the zero heat flux principle, usually reaching a stable reading within about five minutes, and displays the current core temperature and the temperature trend graph of the past two hours.
[0004] However, existing technologies primarily employ a single heating trajectory line or a single heating element superimposed on a temperature sensor, maintaining a zero heat flux state through single power servo control. While structurally simple, this approach suffers from significant radial heat loss: heat in the central region easily diffuses to the periphery, resulting in a slow establishment of the isothermal zone and a large temperature gradient at the edges. In situations with low ambient temperatures, low initial patient skin temperature, or when long-term monitoring is required, axial and radial temperature gradients are difficult to control effectively, affecting measurement accuracy and response speed.
[0005] In the existing technology, some technologies involving multi-zone heaters are mainly used in large-area uniform heating plates in fields such as semiconductor processing. They are not optimized for small skin-attached medical sensors, nor are they combined with the zero heat flux principle, skin heat diffusion characteristics, and real-time radial compensation control logic.
[0006] Therefore, existing technologies still have shortcomings in terms of isothermal uniformity, establishment speed, and ability to adapt to complex clinical environments.
[0007] The information disclosed in the background section is only intended to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention
[0008] The purpose of this invention is to provide an isothermal zone control method for a multi-ring grid heater based on radial thermal compensation, so as to solve the problem that radial heat loss in the existing single heating trajectory line technology leads to slow establishment of the isothermal zone and large temperature gradient.
[0009] To achieve the above objectives, the present invention provides the following technical solution: an isothermal zone control method for a multi-ring grid heater based on radial thermal compensation, specifically comprising:
[0010] The heater is divided into a central heating zone and a peripheral multi-ring heating zone, and is attached to the patient's forehead above the brow bone for collection preparation.
[0011] The control unit collects temperature data in real time and determines whether the heater is in a usable state.
[0012] The control unit executes a phased and zoned power control strategy to optimize the rapid establishment and maintenance of the isothermal zone.
[0013] The current core temperature is displayed digitally on the control unit's screen, and a temperature trend graph of the past two hours is displayed below the screen.
[0014] Preferably, as a preferred embodiment of the isothermal zone control method for a multi-ring grid heater based on radial thermal compensation described in this invention, wherein:
[0015] The heater is divided into a central heating zone and an outer multi-ring zone heating zone, specifically including:
[0016] The central heating zone is located at the geometric center of the heater and corresponds to the skin temperature thermistor through a dense heating grid. The central heating zone performs the main heating task and quickly builds a core isothermal core directly below the heater.
[0017] Based on the periphery of the central heating zone, four concentric ring-shaped reference zones are arranged radially from the inside to the outside. Mutually perpendicular horizontal rectangular coordinate lines and vertical rectangular coordinate lines are constructed along the circumference to establish an orthogonal grid reference array.
[0018] Based on the spatial overlapping projection of the concentric annular reference area and the orthogonal grid reference array, the outer multi-ring partitioned heating area is constructed.
[0019] The periphery of the central heating area is divided into multiple independent grid heating units that are discretely distributed from the inside out and along the circumference through the outer multi-ring partitioned heating area.
[0020] The heater is attached to the patient's forehead above the brow bone for sample preparation, which specifically includes:
[0021] Clean and disinfect the intended application area on the patient's forehead brow bone with alcohol wipes, and wait for the skin to dry completely;
[0022] Connect the heater to the control unit via the sensor cable, ensuring that the sensor tab is fully inserted into the sensor cable connector.
[0023] Peel off the protective layer on the back of the heater to expose the medical adhesive;
[0024] Align the central heating area with the intended application site, gently press the edge of the heater to firmly adhere it to the skin surface, and secure the sensor cable away from the patient's face using a cable clamp.
[0025] Preferably, as a preferred embodiment of the isothermal zone control method for a multi-ring grid heater based on radial thermal compensation described in this invention, wherein:
[0026] After the control unit is powered on, it performs a self-test and enters a ready state. Temperature data is collected in real time through the control unit, specifically including:
[0027] The skin temperature of the central heating zone is collected by a thermistor located in the central heating zone.
[0028] The skin temperature of the heating zone in the multi-ring perimeter is collected by the temperature thermistors corresponding to the heaters of each outer ring.
[0029] Collect the patient's initial skin temperature immediately after the heater is applied;
[0030] The ambient temperature of the operating room and ward is collected by an external ambient temperature sensor connected to the control unit.
[0031] The control unit reads the serial number, usage count, and remaining usage time from the heater's built-in non-volatile memory and determines whether the heater is in a usable state, specifically including:
[0032] The serial number is matched with the internal blacklist and whitelist. If the serial number belongs to the blacklist or does not match the current heater model, the heater is determined to be unusable.
[0033] The number of uses is compared with the maximum allowed number of uses preset by the heater. If it is not less than the maximum allowed number of uses preset by the heater, the heater is determined to be in an unusable state.
[0034] Based on the total usage time of the heater, assess whether the remaining usage time of the heater is sufficient for the next complete treatment session. If the remaining usage time is less than the time required for a single complete treatment session, the heater is deemed unusable.
[0035] Preferably, as a preferred embodiment of the isothermal zone control method for a multi-ring grid heater based on radial thermal compensation described in this invention, wherein:
[0036] The control unit executes a phased and zoned power control strategy, including a rapid setup phase and a maintenance and optimization phase.
[0037] The rapid setup phase specifically includes:
[0038] The control unit calculates the target heating power based on the patient's initial skin temperature and ambient temperature, and quickly establishes a core isothermal zone, specifically including:
[0039] Applying high power to the central heating zone rapidly raises the temperature of the central region, thus constructing a core isothermal core;
[0040] Medium power is simultaneously applied to the first and second rings of the outer multi-ring zoned heating area to actively compensate for radial heat loss in the central heating area.
[0041] The control unit calculates the skin temperature difference between the central heating zone and the peripheral multi-ring zone heating zone in real time, and predicts the radial expansion rate of the isothermal zone using a preset heat diffusion model.
[0042] When the skin temperature in the central heating zone approaches the expected core temperature range and the skin temperature difference is reduced to within 0.5℃, the maintenance optimization phase begins.
[0043] The maintenance and optimization phase specifically includes:
[0044] The system monitors in real time whether the central heating zone has reached thermal equilibrium. If it has, the control unit is switched to a low-power maintenance mode, specifically including:
[0045] Based on the skin temperature of the central heating zone, the skin temperature difference, and the calculation results of the preset heat diffusion model, the heating power of the outer multi-ring zone heating zone is dynamically reduced, and precise compensation is only made for the detected radial heat loss.
[0046] Based on the calculation results of the preset heat diffusion model using the proportional-integral-derivative control algorithm, the heating power of each peripheral multi-ring heating zone is updated every 5 seconds to minimize the temperature gradient between the central heating zone and the peripheral multi-ring heating zones.
[0047] The current core body temperature is recorded every 5 minutes, a temperature trend graph of the past two hours is generated, and the stable core body temperature is output to the external patient vital signs monitor through the monitor port.
[0048] If an abnormally large increase in the skin temperature difference between the central heating zone and the outer multi-ring zone heating zone is detected, or if the heater is loose, the rapid setup phase will be re-executed.
[0049] Preferably, as a preferred embodiment of the isothermal zone control method for a multi-ring grid heater based on radial thermal compensation described in this invention, wherein:
[0050] The current core temperature is displayed digitally on the control unit's screen, and a temperature trend graph of the past two hours is displayed below the screen.
[0051] Once equilibrium is reached, the current core body temperature is transmitted to the patient's vital signs monitor via a monitor cable.
[0052] On the other hand, the present invention provides a computer device including a memory and a processor, wherein the memory stores a computer program, wherein when the computer program is executed by the processor, it implements the steps of the isothermal zone control method for a multi-ring grid heater based on radial thermal compensation as described above.
[0053] On the other hand, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, it implements the steps of the isothermal zone control method for a multi-ring grid heater based on radial thermal compensation as described above in the present invention.
[0054] The technical effects and advantages provided by the present invention in the above technical solution are as follows:
[0055] (1) By dividing the heater into a central heating zone and an outer multi-ring partitioned heating zone, and using the design of spatial overlapping projection of an orthogonal grid reference array and a concentric ring reference zone, a deep spatially decoupled heating network was constructed. The outer multi-ring zone exhibits a heat loss gradient compensation structure (dense inside and sparse outside) from the inside to the outside in the radial direction, which can accurately counteract the radial heat diffusion from the central region to the outer skin and the external environment, fundamentally eliminating the interference of lateral heat conduction on the core temperature measurement. A high-purity core isothermal core is quickly and stably constructed directly below the central region, realizing non-invasive, high-precision, and high-stability measurement of the deep core temperature. Through the step-by-step implementation of the rapid establishment stage and the maintenance optimization stage, the contradiction between heating speed and temperature stability is perfectly resolved:
[0056] (2) During the rapid establishment phase, the central region is driven by a large duty cycle pulse width modulation signal, and the outer first and second rings are driven by medium power synchronously to form an active radial thermal barrier, which greatly shortens the establishment time of the isothermal zone.
[0057] (3) During the maintenance optimization stage, a preset heat diffusion model combined with the Fourier heat conduction equation is introduced for feedforward prediction. The power is dynamically updated every 5 seconds in conjunction with the PID control algorithm to achieve precise degradation or shutdown of the outer loop power. This not only significantly reduces the system power consumption, but also compresses the temperature difference to within 0.5℃, effectively eliminating the risk of burns caused by excessive temperature rise on the skin surface.
[0058] (4) By powering on and performing a self-test on the control unit, and deeply reading the serial number, number of uses and remaining time in the non-volatile memory, triple protection against tampering, secondary abuse and treatment matching is achieved, avoiding data interruption caused by the depletion of equipment during surgery or monitoring. Attached Figure Description
[0059] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.
[0060] Figure 1 This is a flowchart of the isothermal zone control method for a multi-ring grid heater based on radial thermal compensation according to the present invention. Detailed Implementation
[0062] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this disclosure will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art.
[0063] Example 1, referring to Figure 1 This is the first embodiment of the present invention, which provides an isothermal zone control method for a multi-ring grid heater based on radial thermal compensation, specifically including:
[0064] The heater is divided into a central heating zone and a peripheral multi-ring heating zone, and is attached to the patient's forehead above the brow bone for collection preparation.
[0065] The heater is divided into a central heating zone and an outer multi-ring zone heating zone, specifically including:
[0066] The central heating zone is located at the geometric center of the heater and corresponds to the skin temperature thermistor through a dense heating grid. The central heating zone performs the main heating task and quickly builds a core isothermal core directly below the heater.
[0067] Based on the periphery of the central heating zone, four concentric ring-shaped reference zones are arranged radially from the inside to the outside. Mutually perpendicular horizontal rectangular coordinate lines and vertical rectangular coordinate lines are constructed along the circumference to establish an orthogonal grid reference array.
[0068] Based on the spatial overlapping projection of the concentric annular reference area and the orthogonal grid reference array, the outer multi-ring partitioned heating area is constructed.
[0069] The periphery of the central heating area is divided into multiple independent grid heating units that are discretely distributed from the inside out and along the circumference through the outer multi-ring partitioned heating area.
[0070] It should also be noted that the outer multi-ring partitioned heating zone presents a heat loss gradient compensation structure from the inside to the outside in the radial direction. The first ring is close to the central heating zone, and its internal independent grid heating unit has a high heating line density, which performs active compensation for short-distance radial heat diffusion. The heating line density of the second ring and the outermost grid heating units decreases step by step from the inside to the outside, which is used to compensate for radial heat loss at distant edges.
[0071] The heater is attached to the patient's forehead above the brow bone for sample preparation, which specifically includes:
[0072] Clean and disinfect the intended application area on the patient's forehead brow bone with alcohol wipes, and wait for the skin to dry completely;
[0073] Connect the heater to the control unit via the sensor cable, ensuring that the sensor tab is fully inserted into the sensor cable connector.
[0074] Peel off the protective layer on the back of the heater to expose the medical adhesive;
[0075] Align the central heating area with the intended application site, gently press the edge of the heater to firmly adhere it to the skin surface, and secure the sensor cable away from the patient's face using a cable clamp.
[0076] The control unit collects temperature data in real time and determines whether the heater is in a usable state.
[0077] After the control unit is powered on, it performs a self-test and enters a ready state. Temperature data is collected in real time through the control unit, specifically including:
[0078] The skin temperature of the central heating zone is collected by a thermistor located in the central heating zone.
[0079] The skin temperature of the heating zone in the multi-ring perimeter is collected by the temperature thermistors corresponding to the heaters of each outer ring.
[0080] Collect the patient's initial skin temperature immediately after the heater is applied;
[0081] The ambient temperature of the operating room and ward is collected by an external ambient temperature sensor connected to the control unit.
[0082] The control unit reads the serial number, usage count, and remaining usage time from the heater's built-in non-volatile memory and determines whether the heater is in a usable state, specifically including:
[0083] The serial number is matched with the internal blacklist and whitelist. If the serial number belongs to the blacklist (i.e., the heater has been marked as scrapped) or does not match the current heater model, the heater is determined to be unusable.
[0084] The number of uses is compared with the maximum allowed number of uses preset by the heater. If it is not less than the maximum allowed number of uses preset by the heater, the heater is determined to be in an unusable state.
[0085] Based on the total usage time of the heater, assess whether the remaining usage time of the heater is sufficient for the next complete treatment session. If the remaining usage time is less than the time required for a single complete treatment session, the heater is deemed unusable.
[0086] The control unit executes a phased and zoned power control strategy to optimize the rapid establishment and maintenance of the isothermal zone.
[0087] The control unit executes a phased and zoned power control strategy, including a rapid setup phase and a maintenance and optimization phase.
[0088] The rapid setup phase specifically includes:
[0089] The control unit calculates the target heating power based on the patient's initial skin temperature and ambient temperature, and quickly establishes a core isothermal zone, specifically including:
[0090] Applying high power to the central heating zone rapidly raises the temperature of the central region, thus constructing a core isothermal core;
[0091] Medium power is simultaneously applied to the first and second rings of the outer multi-ring zoned heating area to actively compensate for radial heat loss in the central heating area.
[0092] It should also be noted that the higher power refers to a pulse width modulation drive signal with a power duty cycle of 70%-100%, corresponding to an actual heating power of 1.4 watts-2.0 watts, not exceeding the maximum heating power of 2 watts, used to rapidly and powerfully heat the central heating area, so that the temperature of the central area rises rapidly;
[0093] It should also be noted that the medium power refers to a pulse width modulation drive signal with a power duty cycle of 50%-70%, corresponding to an actual heating power of 1.0 watt to 1.4 watts. The first and second rings of the peripheral multi-ring partitioned heating zone work synchronously with this medium power to actively provide radial thermal compensation to the central heating zone, effectively offsetting the radial diffusion loss of heat from the central area to the surrounding skin and external environment, accelerating the uniform expansion of the isothermal zone to the periphery, and preventing the central area temperature from overshooting or the edge temperature gradient from being too large.
[0094] The control unit calculates the skin temperature difference between the central heating zone and the peripheral multi-ring zone heating zone in real time, and predicts the radial expansion rate of the isothermal zone using a preset heat diffusion model.
[0095] It should also be noted that the preset heat diffusion model is based on the simplified Fourier heat conduction equation, that is, the rate of change of temperature with time is equal to the thermal diffusivity multiplied by the Laplace operator of temperature, plus the result of dividing the zone heating power density by the product of material density and specific heat capacity. The control unit predicts the temperature distribution of the isothermal zone in the next 30 to 60 seconds based on real-time parameters such as sensor thickness, skin tissue thermal characteristic parameters, and current ambient temperature. This prediction is used to adjust the heating power of each zone in the feedforward mode to reduce temperature fluctuations and overshoot.
[0096] When the skin temperature in the central heating zone approaches the expected core temperature range (25℃~43℃) and the skin temperature difference is reduced to within 0.5℃, the maintenance optimization phase begins.
[0097] The maintenance and optimization phase specifically includes:
[0098] The system monitors in real time whether the central heating zone has reached thermal equilibrium. If it has, the control unit is switched to a low-power maintenance mode, specifically including:
[0099] Based on the skin temperature of the central heating zone, the skin temperature difference, and the calculation results of the preset heat diffusion model, the heating power of the outer multi-ring zone heating zone is dynamically reduced (the outer ring power is preferentially reduced to below 30% or even turned off), and precise compensation is only made for the detected radial heat loss.
[0100] Based on the calculation results of the preset heat diffusion model using the proportional-integral-derivative control algorithm, the heating power of each peripheral multi-ring heating zone is updated every 5 seconds to minimize the temperature gradient between the central heating zone and the peripheral multi-ring heating zones.
[0101] The current core body temperature is recorded every 5 minutes, a temperature trend graph of the past two hours is generated, and the stable core body temperature is output to the external patient vital signs monitor through the monitor port.
[0102] If an abnormally large increase in the skin temperature difference between the central heating zone and the outer multi-ring zone heating zone is detected, or if the heater is loose, the rapid setup phase will be re-executed.
[0103] It should also be noted that when the reading of the skin temperature thermistor exceeds 43°C or the reading of the heater temperature thermistor exceeds 44.5°C, the heating circuit will be immediately cut off and an alarm will be issued.
[0104] It should also be noted that when the heater has been used for 24 hours or the remaining number of uses is zero, the control unit will display the corresponding error code and stop heating.
[0105] It should also be noted that when a patient is transferred, the sensor cable is disconnected, but the sensor remains on the patient; after reconnection, the control unit can automatically read and continue transmitting the temperature trend graph, quickly completing the rebalancing.
[0106] The current core temperature is displayed digitally on the control unit's screen, and a temperature trend graph of the past two hours is displayed below the screen.
[0107] The current core temperature is displayed digitally on the control unit's screen, and a temperature trend graph of the past two hours is displayed below the screen.
[0108] It should also be noted that, based on the zero heat flow principle, when the central heating zone and the peripheral multi-ring zone heating zone reach thermal equilibrium and the lateral heat conduction is zero, the skin temperature collected by the central heating zone is equivalent to the patient's core body temperature.
[0109] Once equilibrium is reached, the current core body temperature is transmitted to the patient's vital signs monitor via a monitor cable.
[0110] The computer device can be a terminal, comprising a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.
[0111] This embodiment also provides a storage medium storing a computer program that, when executed by a processor, implements the steps of the isothermal zone control method for a multi-ring grid heater based on radial thermal compensation as proposed in the above embodiments. The storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.
[0112] Example 2
[0113] The following is another embodiment of the present invention, which provides an isothermal zone control method for a multi-ring grid heater based on radial thermal compensation. In order to verify the beneficial effects of the present invention, a simulation experiment is conducted for scientific demonstration.
[0114] Using the COMSOL Multiphysics multiphysics coupling simulation platform, a three-dimensional human forehead skin-fat-muscle multilayer tissue model was established. The skin layer thickness was set to 2 mm, the fat layer thickness was set to 5 mm, and the ambient temperature was set to 18℃ (low temperature environment) and 23℃ (conventional operating room and ward environment). The patient's initial skin temperature was set to 32℃ (hypothermic patients) and 35℃ (normal body temperature patients).
[0115] The specific parameters of the heater model in the experimental example are: diameter 41 mm, central heating zone diameter 18 mm, four layers of concentric rings and orthogonal grid composite partitioned heating structure on the periphery, and maximum total heating power 2 watts;
[0116] The comparison example is a traditional single heating trajectory structure, with the total heating power also limited to 2 watts.
[0117] Regarding the control strategy, the experimental example uses the phased and zoned power control strategy, while the control example uses the traditional single PID constant power control strategy. The simulation time step is set to 1 second, and the simulation runs continuously for 30 minutes.
[0118] Simulation results and comparative analysis, specifically including:
[0119] Under conditions of a low temperature of 18°C and an initial skin temperature of 32°C:
[0120] Experimental example: The time required for the central area to reach thermal equilibrium is 2.8 minutes;
[0121] For comparison, the time required to reach the same equilibrium state is 6.4 minutes.
[0122] The isothermal zone establishment time of this invention is reduced by approximately 56%.
[0123] Under normal environmental conditions of 23°C and an initial skin temperature of 35°C:
[0124] The experimental setup time was 2.1 minutes, while the control set time was 5.1 minutes, a reduction of approximately 59%.
[0125] After reaching a steady state, measure the radial temperature difference between the heater edge (at a radius of 20 mm) and the center point:
[0126] Experimental example: The maximum radial temperature gradient is 0.18℃;
[0127] Comparative example: The maximum radial temperature gradient is 0.67℃.
[0128] The present invention improves radial temperature uniformity by about 73% and effectively suppresses radial heat loss.
[0129] Using a deep tissue temperature of 37.0℃ as the true reference:
[0130] The final stable measurement error of the core temperature in the experimental example was ±0.12℃;
[0131] The error in the final stable measurement of the nucleus temperature in the control example was ±0.31℃.
[0132] During the maintenance and optimization phase, the experimental example dynamically reduced the power of the outer ring, resulting in a total energy consumption reduction of approximately 28% compared to the control example within 30 minutes, while also avoiding temperature overshoot in the central region.
[0133] The simulation results and comparative analysis above show that the isothermal zone control method of the multi-ring grid heater based on radial thermal compensation, through the synergistic effect of the central heating zone and the peripheral multi-ring partitioned heating zone, and the staged partitioned intelligent control strategy based on the thermal diffusion model, significantly shortens the isothermal zone establishment time, reduces the radial temperature gradient, improves the accuracy of core temperature measurement, and reduces energy consumption.
[0134] Compared with existing zero-heat-flux technologies that use a single heating trajectory, this invention exhibits superior stability and adaptability in low-temperature environments, hypothermic patients, and long-term monitoring scenarios. It has significant creative and practical value, providing a more reliable technical solution for clinical non-invasive body temperature monitoring.
[0135] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.
Claims
1. A method for isothermal zone control of a multi-ring grid heater based on radial thermal compensation, characterized in that, Specifically, it includes: The heater is divided into a central heating zone and a peripheral multi-ring heating zone, and is attached to the patient's forehead above the brow bone for collection preparation. The control unit collects temperature data in real time and determines whether the heater is in a usable state. The control unit executes a phased and zoned power control strategy to optimize the rapid establishment and maintenance of the isothermal zone. The current core temperature is displayed digitally on the control unit's screen, and a temperature trend graph of the past two hours is displayed below the screen.
2. The isothermal zone control method for a multi-ring grid heater based on radial thermal compensation according to claim 1, characterized in that: The division of the heater into a central heating zone and peripheral multi-ring zone heating zones specifically includes: The central heating zone is located at the geometric center of the heater and corresponds to the skin temperature thermistor through a dense heating grid. The central heating zone performs the main heating task and quickly builds a core isothermal core directly below the heater. Based on the periphery of the central heating zone, four concentric ring-shaped reference zones are arranged radially from the inside to the outside. Mutually perpendicular horizontal rectangular coordinate lines and vertical rectangular coordinate lines are constructed along the circumference to establish an orthogonal grid reference array. Based on the spatial overlapping projection of the concentric annular reference area and the orthogonal grid reference array, the outer multi-ring partitioned heating area is constructed. The periphery of the central heating zone is divided into multiple independent grid heating units that are discretely distributed from the inside out and along the circumference by the outer multi-ring partitioned heating zone.
3. The isothermal zone control method for a multi-ring grid heater based on radial thermal compensation according to claim 1, characterized in that: The real-time acquisition of temperature data through the control unit specifically includes: The skin temperature of the central heating zone is collected by a thermistor located in the central heating zone. The skin temperature of the heating zone in the multi-ring perimeter is collected by the temperature thermistors corresponding to the heaters of each outer ring. Collect the patient's initial skin temperature immediately after the heater is applied; The ambient temperature of the operating room and ward is collected by an external ambient temperature sensor connected to the control unit. The control unit reads the serial number, usage count, and remaining usage time from the heater's built-in non-volatile memory and determines whether the heater is in a usable state, specifically including: The serial number is matched with the internal blacklist and whitelist. If the serial number belongs to the blacklist or does not match the current heater model, the heater is determined to be unusable. The number of uses is compared with the maximum allowed number of uses preset by the heater. If it is not less than the maximum allowed number of uses preset by the heater, the heater is determined to be in an unusable state. Based on the total usage time of the heater, assess whether the remaining usage time of the heater is sufficient for the next complete treatment session. If the remaining usage time is less than the time required for a single complete treatment session, the heater is deemed unusable.
4. The isothermal zone control method for a multi-ring grid heater based on radial thermal compensation according to claim 1, characterized in that: The control unit executes a phased and zoned power control strategy, including a rapid setup phase and a maintenance and optimization phase. The rapid setup phase specifically includes: The control unit calculates the target heating power based on the patient's initial skin temperature and ambient temperature, and quickly establishes a core isothermal zone, specifically including: Applying high power to the central heating zone rapidly raises the temperature of the central region, thus constructing a core isothermal core; Medium power is simultaneously applied to the first and second rings of the outer multi-ring zoned heating area to actively compensate for radial heat loss in the central heating area. The control unit calculates the skin temperature difference between the central heating zone and the peripheral multi-ring zone heating zone in real time, and predicts the radial expansion rate of the isothermal zone using a preset heat diffusion model. When the skin temperature in the central heating zone approaches the expected core temperature range and the skin temperature difference is reduced to within 0.5℃, the maintenance optimization phase begins. The maintenance and optimization phase specifically includes: The system monitors in real time whether the central heating zone has reached thermal equilibrium. If it has, the control unit is switched to a low-power maintenance mode, specifically including: Based on the skin temperature of the central heating zone, the skin temperature difference, and the calculation results of the preset heat diffusion model, the heating power of the outer multi-ring zone heating zone is dynamically reduced, and precise compensation is only made for the detected radial heat loss. Based on the calculation results of the preset heat diffusion model using the proportional-integral-derivative control algorithm, the heating power of each peripheral multi-ring heating zone is updated every 5 seconds to minimize the temperature gradient between the central heating zone and the peripheral multi-ring heating zones. The current core body temperature is recorded every 5 minutes, a temperature trend graph of the past two hours is generated, and the stable core body temperature is output to the external patient vital signs monitor through the monitor port. If an abnormally large increase in the skin temperature difference between the central heating zone and the outer multi-ring zone heating zone is detected, or if the heater is loose, the rapid setup phase will be re-executed.
5. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, it implements the steps of the isothermal zone control method for a multi-ring grid heater based on radial thermal compensation as described in any one of claims 1 to 4.
6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the steps of the isothermal zone control method for a multi-ring grid heater based on radial thermal compensation as described in any one of claims 1 to 4.