A bluetooth wireless body temperature measuring device

Abstract

The utility model discloses a kind of bluetooth wireless body temperature measuring devices, belong to medical monitoring equipment field, to solve the problem of traditional device low efficiency, wiring is complicated, data lag and no remote monitoring. Device contains wireless body temperature sensor and relay box, by bluetooth realizes "front end acquisition-middle end forwarding-back end application" monitoring link. Sensor is built-in first bluetooth master control MCU, thermosensitive resistance and sampling power supply control module, 3.7V rechargeable lithium battery power supply, small and wearable, real-time sampling data. Relay box is with second bluetooth master control MCU, etc., connect 8-16 sensors, communication distance is 10-30 meters, Type-C charging, can convert data into standard signal to host computer, and there is indicator light state. Device improves monitoring flexibility and precision, low power consumption, easy to expand, applicable to multiple medical related scene.

Description

Technical Field

[0001] This utility model belongs to the field of medical monitoring equipment, and in particular relates to a Bluetooth wireless body temperature measurement device. Background Technology

[0002] In current medical settings, temperature measurement devices are mainly divided into two categories: contact-type (such as mercury thermometers and electronic thermometers) and wired temperature monitoring devices. Both types of products have significant pain points in their use: Contact-based measurements are inefficient and data is delayed: mercury thermometers require manual operation and waiting for measurement results, and the data must be recorded manually, which is prone to human error; although electronic thermometers shorten the measurement time, they still require contact with each patient, which is inefficient in multi-person monitoring scenarios (such as ward rounds) and cannot meet the needs of real-time dynamic monitoring.

[0003] Wired monitoring equipment is cumbersome and lacks flexibility: Traditional wired body temperature monitoring systems rely on data cables to connect sensors and the host, which is complicated and easily affected by environmental interference. Patients' range of movement is restricted, and wear and aging of the cables can easily lead to data transmission interruptions, increasing equipment maintenance costs.

[0004] Lack of data integration and remote monitoring: Most existing body temperature measurement devices lack data storage or remote transmission functions. Medical staff need to view the data on-site, making it impossible to obtain real-time trends of body temperature changes in multiple patients and to achieve automatic alarms for abnormal body temperatures, which is not conducive to timely intervention in the condition.

[0005] Therefore, designing a Bluetooth wireless body temperature measurement device that combines wireless transmission, low power consumption, and high stability, and realizing the real-time acquisition, transmission, and integration of body temperature data through a "sensor-relay box" collaborative architecture, has become a key direction for solving the current pain points of medical body temperature monitoring. Utility Model Content

[0006] The purpose of this utility model is to provide a Bluetooth wireless body temperature measurement device, aiming to solve the problems existing in the background art. To achieve this purpose, the technical solution adopted by this utility model is: A Bluetooth wireless body temperature measurement device includes two core modules: a wireless body temperature sensor and a relay box. The two modules interact via Bluetooth wireless communication, forming a complete monitoring link of "front-end data acquisition - mid-end forwarding - back-end application". Wireless body temperature sensor: This sensor collects body temperature data through direct contact with the patient's skin (or close to clothing) and transmits the data to a relay box via Bluetooth. It features miniaturization and low power consumption, allowing for long-term wear or fixed use. Its internal structure includes a first Bluetooth main control MCU, a body temperature Bluetooth antenna, a first download and debugging module, a first Bluetooth indicator module, a sampling power control module, a temperature sampling module, a thermistor, a sensor battery, and a first power switch. The first Bluetooth main control MCU serves as the core control unit, connected to the first download and debugging module (for program burning and troubleshooting), the body temperature Bluetooth antenna (for wireless data transmission), multiple first Bluetooth indicator modules (displaying sensor operating status such as power on, Bluetooth connection, and data transmission), and the sampling power control module (controlling the power supply to the temperature sampling module to reduce power consumption). The temperature sampling module (processes the analog signal collected by the thermistor) and the first power switch (controls the overall power supply of the sensor) are electrically connected. The first power switch is electrically connected to the sensor battery (using a 3.7V rechargeable lithium battery with a capacity of 100-200mAh, supporting continuous operation for more than 72 hours) to provide a stable power supply to the sensor. The temperature sampling module is electrically connected to the thermistor (using an NTC negative temperature coefficient thermistor with a measurement accuracy of ±0.1℃ and a measurement range of 32-42℃, suitable for the human body temperature range) and the sampling power control module to ensure the accuracy of body temperature data acquisition and low power consumption control.

[0007] Repeater Box: As a data relay and protocol conversion unit, it receives body temperature data from multiple wireless temperature sensors and converts the data into standard signals (such as RS485, USB) for transmission to a host computer (such as a computer or medical monitoring platform). It also features local status indication and charging management functions. Its internal structure includes a second Bluetooth master control MCU, a repeater Bluetooth antenna, a Bluetooth pairing module, a second Bluetooth indicator light, a resistance indicator light, a power indicator light, a charging indicator light, a charging module, a charging port, a repeater box battery, a second power switch, a second download and debugging module, and a conversion circuit module. The second Bluetooth master control MCU is the core of the repeater box, connecting to the repeater Bluetooth antenna (receiving sensor data, communication distance 10-30 meters, supporting simultaneous connection of 8-16 sensors), the Bluetooth pairing module (enabling rapid pairing between sensors and the repeater box, automatically saving connection information after successful pairing to avoid repeated operations), the second Bluetooth indicator light (displaying the repeater box's Bluetooth connection status), the resistance indicator light (indicating the resistance setting of the digital potentiometer in the conversion circuit module to ensure signal conversion accuracy), and the power indicator light. The repeater box displays the power supply status, and the repeater box battery (a 3.7V / 1000mAh rechargeable lithium battery, supporting 120 hours of continuous operation or long-term use with an external power supply), the second download and debugging module (used for repeater box program burning and troubleshooting), and the conversion circuit module (converting the digital signal received by Bluetooth into an analog / digital signal recognizable by the host computer) are electrically connected. The repeater box battery is electrically connected to the charging module (with overcharge and over-discharge protection, charging current of 500mA, and a full charge time of approximately 2 hours) and the second power switch (controlling the overall power supply of the repeater box). The charging module is electrically connected to the charging indicator light (a solid red light during charging and a solid green light when fully charged) and the charging port (using a Type-C interface, supporting reversible insertion, and compatible with mainstream charging devices) to improve charging convenience.

[0008] Furthermore, to ensure the accuracy of temperature data conversion, the conversion circuit module includes a first digital potentiometer, a second digital potentiometer, a resistor, and a temperature output module. The second Bluetooth master control MCU is electrically connected to the first and second digital potentiometers respectively, and adjusts the potentiometer resistance values ​​through software control to adapt to the signal input requirements of different host computers. The second digital potentiometer is connected in series with the resistor to form a stable voltage divider circuit to avoid signal fluctuations. The first and second digital potentiometers are electrically connected to the temperature output module to convert the processed temperature signal into a standard voltage / current signal (such as a 0-5V voltage signal and a 4-20mA current signal) to ensure accurate data parsing in the host computer.

[0009] Furthermore, to ensure the power supply stability of each module in the repeater box, the second power switch is also connected to a 3.3V voltage regulator. The voltage regulator adopts a low dropout linear regulator (LDO) with an output voltage accuracy of ±2%. It can stably convert the 3.7V voltage of the repeater box battery to 3.3V to power sensitive electronic components such as the second Bluetooth main control MCU and Bluetooth pairing module, avoiding data transmission errors or module damage caused by voltage fluctuations.

[0010] Furthermore, the charging port is a Type-C charging port, which supports 5V / 1A charging specifications and is compatible with mainstream mobile phone chargers, power banks and other devices on the market. There is no need to equip it with a dedicated charger, which improves the flexibility of the device and is especially suitable for home care or mobile monitoring scenarios.

[0011] The beneficial effects of this utility model are: Wireless transmission enhances monitoring flexibility: Replacing traditional wired connections with Bluetooth wireless communication, the wireless temperature sensor is small in size (can be designed as a patch or wristband), allowing patients to wear it without feeling restricted. The repeater box supports simultaneous connection of multiple sensors and can cover a range of 10-30 meters, making it suitable for simultaneous monitoring of multiple beds in wards, significantly reducing wiring costs and environmental interference.

[0012] Low power consumption design extends usage time: The wireless body temperature sensor uses a "sampling power control module" to provide power on demand. The temperature sampling module is only activated when body temperature is being sampled, and enters sleep mode when idle. It can run on an external power supply for a long time, reducing the maintenance cost of frequent charging.

[0013] Accurate data and visible status: It adopts NTC high-precision thermistors, with a body temperature measurement accuracy of ±0.1℃, which meets the needs of medical-grade monitoring; both the sensor and the relay box are equipped with multiple sets of indicator lights (such as Bluetooth connection light, power light, and charging light) to intuitively judge the working status of the device. At the same time, the conversion circuit module adjusts the signal accuracy through a digital potentiometer to ensure that the data is accurately presented in the host computer.

[0014] Highly compatible and easy to integrate and expand: The repeater box supports Type-C charging and standard signal output (such as RS485, USB), and can be connected to the hospital's existing medical monitoring platform, home computer or mobile device (via Bluetooth adapter) to realize real-time display, storage and abnormal alarm of body temperature data (requires the cooperation of host computer software), which facilitates remote monitoring and disease analysis by medical staff. Attached Figure Description

[0015] Figure 1 A schematic diagram of the principle provided for an embodiment of this utility model; Figure 2 A schematic diagram of the wireless body temperature sensor structure provided in this embodiment of the utility model; Figure 3This is a schematic diagram of the relay box structure provided in an embodiment of the present utility model.

[0016] The following are the labeling elements in the figure: 1. Wireless body temperature sensor; 101. First Bluetooth main control MCU; 102. Body temperature Bluetooth antenna; 103. First download and debugging module; 104. First Bluetooth indicator module; 105. Sampling power control module; 106. Temperature sampling module; 107. Thermistor; 108. Sensor battery; 109. First power switch; 2. Repeater box; 201. Second Bluetooth main control MCU; 202. Repeater Bluetooth antenna; 203. Bluetooth pairing module; 204. Second Bluetooth indicator; 205. Resistance indicator; 206. Power indicator; 207. Charging indicator; 208. Charging module; 209. Charging port; 210. Repeater box battery; 211. Second power switch; 212. Second download and debugging module; 213. Conversion circuit module; 2131. First digital potentiometer; 2132. Second digital potentiometer; 2133. Resistor; 2134. Temperature output module; 3. Voltage regulator. Detailed Implementation

[0017] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0018] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element present. Conversely, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations. The terms "upper end," "lower end," "left side," "right side," "front end," "rear end," and similar expressions used herein refer to the positional relationship with reference to the accompanying drawings.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0021] like Figures 1-3 As shown, this utility model embodiment provides a Bluetooth wireless body temperature measurement device, including a wireless body temperature sensor 1 and a relay box 2; The design of the wireless body temperature sensor 1 focuses on "miniaturization, low power consumption, and high precision": The first Bluetooth master control MCU101 uses the Nordic RF52832 chip, which supports Bluetooth 5.0 protocol, has a receiver sensitivity of -96dBm, a transmission rate of 1Mbps, an idle current of only 0.5μA, and a sleep current of 0.1μA, which can significantly reduce the overall power consumption of the sensor. Its built-in 12-bit ADC module can directly interface with the analog signal of the temperature sampling module 106, reducing the number of external components and keeping the sensor size within 20mm×15mm×3mm. It can be designed as a patch (attached to the patient's forehead or armpit) or integrated into a wristband.

[0022] The body temperature Bluetooth antenna 102 uses a built-in antenna on the PCB, operates at a frequency of 2.4GHz, has a communication distance of 10-15 meters (in an unobstructed environment), supports Bluetooth broadcast mode, and sends body temperature data once every 30 seconds (the sending interval can be configured through the first download and debugging module 103). The current for a single data transmission is about 10mA, and the transmission duration is 10ms, further reducing power consumption.

[0023] The temperature sampling module 106 uses an instrumentation amplifier AD8233 to amplify and filter the resistance change signal of the thermistor 107 (selected as an NTC thermistor MF52-10K, with an accuracy of ±0.1℃ and a resistance of 10KΩ at 37℃). The amplification factor is set to 100 times, which can convert the weak temperature signal into a standard voltage signal of 0-3.3V and transmit it to the ADC interface of the first Bluetooth main control MCU101 to ensure the accuracy of body temperature measurement.

[0024] The sampling power control module 105 uses a MOSFET AO3401, which is controlled by the GPIO pin of the first Bluetooth master control MCU 101 to turn on / off: when sampling is required, the GPIO outputs a high level, the MOSFET is turned on, and power is supplied to the temperature sampling module 106 (current about 50μA); after sampling is completed, the GPIO outputs a low level, the MOSFET is turned off, the power supply to the temperature sampling module 106 is cut off, and only the sleep circuit of the first Bluetooth master control MCU 101 is kept working, so that the average operating current of the sensor is controlled within 10μA. With the 150mAh sensor battery 108 (3.7V lithium polymer battery), it can achieve stable operation for more than 72 hours continuously.

[0025] The first Bluetooth indicator module 104 is equipped with three LEDs: a red light (power indicator, solid light indicates normal power supply), a blue light (Bluetooth connection indicator, flashing indicates no connection, solid light indicates connection to the relay box), and a green light (data transmission indicator, flashing once for each data transmission), which helps medical staff quickly determine the sensor's working status.

[0026] The design of repeater box 2 is based on "multi-device compatibility, high stability, and easy maintenance": The second Bluetooth master control MCU201 uses the STM32L476RG chip, which supports Bluetooth 5.0 dual-mode (BLE + classic Bluetooth) and can connect to 8 wireless body temperature sensors 1 at the same time. It has 64KBSRAM and 1MBFlash built in, and can store more than 1,000 body temperature data (which will not be lost when power is off). It is connected to the conversion circuit module 213 through the UART interface to realize data format conversion.

[0027] The Bluetooth repeater antenna 202 uses an external ceramic antenna with a gain of 2dBi and a communication distance of 20-30 meters (in an unobstructed environment). It has strong anti-interference capabilities and can effectively avoid signal interference from other wireless devices (such as WiFi and walkie-talkies) in the hospital, ensuring a data transmission success rate of ≥99.5%.

[0028] The Bluetooth pairing module 203 adopts a button-triggered design: after pressing the pairing button, the relay box 2 enters the pairing mode (the second Bluetooth indicator light 204 flashes rapidly). If the wireless body temperature sensor 1 is not connected at this time, it will automatically pair with the relay box 2. After successful pairing, the second Bluetooth indicator light 204 turns on and the pairing information is stored in the Flash of the second Bluetooth main control MCU 201. There is no need to re-pair the next time it is powered on, simplifying the operation process.

[0029] In the conversion circuit module 213, the first digital potentiometer 2131 is an MCP4131 (10KΩ, 128 adjustable levels), and the second digital potentiometer 2132 is an MCP4161 (100KΩ, 256 adjustable levels). The resistance values ​​are controlled by the second Bluetooth master control MCU 201 through the SPI interface: when the host computer needs a 0-5V voltage signal, the potentiometer is adjusted to make the temperature output module 2134 output the corresponding voltage (e.g., 2.5V for 37℃, 3V for 38℃); when the host computer needs a 4-20mA current signal, the voltage signal is converted into a current signal through the series resistor 2133 (a 125Ω precision resistor) to meet the interface requirements of different host computers.

[0030] The charging module 208 uses the TP4056 chip, which features constant current charging (500mA), constant voltage charging (4.2V), overcharge protection (4.3V), and over-discharge protection (2.5V). The charging indicator 207 (solid red indicates charging, solid green indicates fully charged) is paired with a Type-C charging port 209, which is compatible with mainstream charging devices. The charging time is approximately 2 hours (the relay box battery 210 is a 3.7V / 1000mAh lithium polymer battery).

[0031] The second power switch 211 connects to a 3.3V voltage regulator 3 (using the LP3985 chip), with an output current of 1A and a voltage accuracy of ±2%. It provides stable power to the second Bluetooth main control MCU 201, Bluetooth pairing module 203, and other modules, avoiding module failures caused by voltage fluctuations (3.3-4.2V) in the repeater box battery 210.

[0032] The above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions also fall within the scope of the present utility model. The patent protection scope of the present utility model should be defined by the claims.

Claims

1. A Bluetooth wireless body temperature measurement device, characterized in that: It includes a wireless body temperature sensor and a relay box, wherein the wireless body temperature sensor is used to measure the patient's body temperature and transmit the measured body temperature to the relay box; The wireless body temperature sensor includes a first Bluetooth main control MCU, a body temperature Bluetooth antenna, a first download and debugging module, a first Bluetooth indicator module, a sampling power control module, a temperature sampling module, a thermistor, a sensor battery, and a first power switch. The first Bluetooth main control MCU is electrically connected to the first download and debugging module, the body temperature Bluetooth antenna, multiple first Bluetooth indicator modules, the sampling power control module, the temperature sampling module, and the first power switch. The first power switch is electrically connected to the sensor battery, and the temperature sampling module is electrically connected to the thermistor and the sampling power control module.

2. The Bluetooth wireless body temperature measuring device according to claim 1, characterized in that: The repeater box includes a second Bluetooth master control MCU, a repeater Bluetooth antenna, a Bluetooth pairing module, a second Bluetooth indicator light, a stop indicator light, a power indicator light, a charging indicator light, a charging module, a charging port, a repeater box battery, a second power switch, a second download and debugging module, and a conversion circuit module. The second Bluetooth master control MCU is electrically connected to the repeater Bluetooth antenna, the Bluetooth pairing module, the second Bluetooth indicator light, the stop indicator light, the power indicator light, the repeater box battery, the second download and debugging module, and the conversion circuit module. The repeater box battery is electrically connected to the charging module and the second power switch. The charging module is electrically connected to the charging indicator light and the charging port.

3. The Bluetooth wireless body temperature measuring device according to claim 2, characterized in that: The conversion circuit module includes a first digital potentiometer, a second digital potentiometer, a resistor, and a temperature output module. The second Bluetooth master control MCU is electrically connected to the first digital potentiometer and the second digital potentiometer. The second digital potentiometer is electrically connected to the resistor. The first digital potentiometer and the second digital potentiometer are electrically connected to the temperature output module.

4. The Bluetooth wireless body temperature measuring device according to claim 3, characterized in that: The second power switch is also connected to a 3.3V voltage regulator.

5. A Bluetooth wireless body temperature measuring device according to claim 4, characterized in that: The charging port is a Type-C charging port.

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