Intelligent dynamic pressure sore prevention nursing bed

Abstract

The invention relates to an intelligent dynamic pressure sore prevention nursing bed which comprises a bed frame, a lifting seat, a supporting column array and a control system. The lifting seat is arranged at the top of the bedstead, and an electric lifting mechanism is arranged at the bottom and comprises at least four main electric push rods arranged at four corners of the bedstead. The supporting column array is composed of a plurality of cylindrical supporting columns, and a supporting electric push rod is arranged at the bottom of each supporting column. The control system comprises a main control circuit board, a pressure sensor installed at the top end of the supporting column and action sensors installed on the periphery of the bed frame. A control box is arranged at the side end of the bed frame, detachable vital sign monitoring belts are arranged on the two sides of the bed frame, optical sensors and temperature sensors are integrated in the monitoring belts, and the monitoring belts communicate with a control system through wireless transmission modules. The supporting structure can be dynamically adjusted according to pressure and action information, fitting supporting and vital sign collection are achieved, the intelligent nursing level is improved, and the problems that a traditional pressure sore prevention bed is slow in response and inaccurate in adjustment and depends on wearable equipment are solved.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, and particularly relates to an intelligent dynamic pressure ulcer prevention nursing bed. Background Art

[0002] Patients who are bedridden for a long time are prone to pressure ulcers due to long-term local pressure on the body. To reduce the incidence of pressure ulcers, various pressure ulcer prevention mattresses or nursing bed structures have been proposed in the prior art. One common method is to use an inflatable air cushion, which alternately inflates and deflates at regular intervals to disperse the body pressure. However, since most of these mattresses adjust the air pressure in the overall area, it is impossible to achieve local adjustment of specific pressure concentration sites, and it is difficult to truly achieve "precision decompression". Some air cushion beds also have problems such as uneven inflation, loud noise, and loss of function after air leakage, seriously affecting the comfort and safety of patients.

[0003] Another type of product uses a mechanical structure to lift the local area of the bed surface to change the shape of the support surface and achieve a certain body position adaptation function. However, due to the lack of fineness in the adjustment structure and the slow response time, it is difficult to adapt to the changes in the patient's turning over, moving, etc. in real time. In addition, although some existing nursing beds integrate a sensor system to obtain the patient's position information, the sensor layout is relatively sparse, the data collection is not comprehensive enough, and the control logic is single, making it difficult to achieve dynamic linkage adjustment of the bed surface structure.

[0004] At the same time, there are few solutions in the current nursing beds that effectively integrate the vital sign monitoring function with the bed body structure. Most rely on independent wearable devices, which are difficult to ensure the stability and accuracy of continuous wearing in the elderly or critically ill patients. Therefore, how to improve the response accuracy of the support structure, the data acquisition density, and the nursing intelligence level while ensuring comfortable support is still an urgent problem to be solved in the prior art. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides an intelligent dynamic pressure ulcer prevention nursing bed, which effectively solves the problems of inaccurate pressure adjustment, slow response speed, inability to adapt to the patient's body position changes in real time, and dependence on external wearable devices for vital sign monitoring in existing pressure ulcer prevention devices.

[0006] The technical solutions adopted by the present invention to solve the above problems are as follows: An intelligent dynamic pressure ulcer prevention nursing bed, comprising a bed frame, a lifting seat, an array of support columns, and a control system, The lifting seat is arranged on the top of the bed frame, and an electric lifting mechanism is provided at the bottom of the lifting seat. The electric lifting mechanism includes at least four main electric push rods, and the main electric push rods are respectively arranged at the four corners of the bed frame; The array of support columns is composed of several support columns. The support columns are cylindrical structures, and a support electric push rod is provided at the bottom of each support column; The control system includes a main control circuit board, a pressure sensor, and a motion sensor. A control box is installed at the side end of the bed frame, and the main control circuit board is installed inside the control box. The pressure sensor is fixed at the top of the support column, and the motion sensor is installed around the bed frame. Detachable vital sign monitoring bands are provided on both sides of the bed frame. An optical sensor and a temperature sensor are integrated inside the vital sign monitoring bands and communicate with the control system through a wireless transmission module.

[0007] Preferably, the main body of the main electric push rod is fixedly connected to the bed frame, and the end of the main electric push rod is fixedly connected to the lifting seat.

[0008] Preferably, a mounting seat is fixedly connected to the bottom of the lifting seat. The bottom end of the support electric push rod is fixedly connected to the mounting seat, and the top end of the support electric push rod is fixedly connected to the corresponding support column.

[0009] Preferably, the support columns are arranged in a rectangular array, and the center distance between adjacent support columns is 2 - 3 cm.

[0010] Preferably, the top of the support column is covered with a medical silicone layer. The thickness of the medical silicone layer is 2 - 5 mm, and evenly distributed air-permeable micropores are provided on the surface. The aperture of the air-permeable micropores is 0.5 - 1 mm, and the pore spacing is 2 - 3 mm.

[0011] Preferably, a main control circuit board, a power management module, and a signal conditioning circuit are provided inside the control box. An STM32F407 microcontroller chip is soldered on the main control circuit board. The GPIO pins of the chip are connected to the motor drivers of each support electric push rod through an FPC cable. The signal conditioning circuit includes an AD620 instrumentation amplifier. Its input end is connected to the pressure sensor at the top of the support column through a shielded twisted pair wire, and the output end is connected to the ADC pin of the microcontroller chip. The vital sign monitoring module is connected to the microcontroller chip through an I2C bus. The power management module includes an XL6009 DC-DC converter. Its input end is connected to an external 24V power supply interface, and the output end provides 5V and 3.3V voltages respectively. An LED status indicator and an emergency stop button are provided on the front side of the control box, and an RS485 communication interface and a power supply interface are provided on the rear side.

[0012] Preferably, the pressure sensor is a thin-film pressure sensor, model FlexiForce A201, with a measuring range of 0 - 100N and an accuracy of ±2.5% FS; the motion sensor is a three-axis acceleration sensor, model ADXL345, with an installation spacing of 50 - 80 cm; the optical sensor is a reflective photoelectric sensor, model MAX30102, including dual light sources of red light (660 nm) and infrared light (880 nm); the temperature sensor is a medical-grade patch temperature sensor, model TMP117, with a measurement range of 25°C - 50°C and an accuracy of ±0.1°C; the wireless transmission module is a Bluetooth 5.0 low-power module, model DA14580, with a transmission distance of 10 meters.

[0013] The structure of the present invention is novel, ingeniously conceived, and simple and convenient to operate. Compared with the prior art, it has the following advantages: 1. By setting a lifting seat at the top of the bed frame and configuring main electric push rods at the four corners of the bed frame, the entire bed surface can achieve stable and synchronous overall lifting adjustment, facilitating the operation of medical staff and the patient getting on and off the bed, and improving the nursing efficiency and safety.

[0014] 2. The present device adopts a structure of multiple support columns arranged in a rectangular array, and an independent support electric push rod is set at the bottom of each support column to achieve high-density distribution and independent drive control of the bed surface support unit. Cooperating with the pressure sensor installed at the top of the support column and the motion sensor around the bed frame, the pressure distribution and motion state of the patient's body can be accurately obtained, thereby realizing local dynamic adjustment of the support surface and improving the decompression accuracy.

[0015] 3. The present device is provided with detachable vital sign monitoring bands on both sides of the bed frame. The monitoring bands integrate an optical sensor and a temperature sensor inside, and communicate with the control system through a wireless module. Without affecting the patient's activities and comfort, the vital sign monitoring function integrated with the bed body is realized structurally, avoiding the problems of inconvenient wearing or unstable data of traditional wearable devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the first axonometric view of an intelligent dynamic pressure ulcer prevention nursing bed of the present invention.

[0017] Figure 2 is the second axonometric view of an intelligent dynamic pressure ulcer prevention nursing bed of the present invention.

[0018] Figure 3 is the axonometric view of the support electric push rod and its connecting components of an intelligent dynamic pressure ulcer prevention nursing bed of the present invention.

[0019] In the drawings: 1 - bed frame, 2 - lifting seat, 3 - control box, 4 - main electric push rod, 5 - support column, 6 - mounting seat, 7 - support electric push rod. Detailed implementation manners

[0020] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0021] As Figures 1 to 3 shown, an intelligent dynamic pressure ulcer prevention nursing bed provided by the present invention includes a bed frame 1, a lifting seat 2, a support column array, and a control system. The bed frame 1 is a rectangular frame structure, made of aluminum alloy profiles or steel structures, and is provided with rollers and brake devices at the bottom to facilitate the movement and positioning of the bed body. The lifting seat 2 is horizontally arranged on the top of the bed frame 1 and is used to support the support column array and the mounting seat 6. Four corners of the lifting seat 2 are fixedly connected with main electric push rods 4. The lower ends of the main electric push rods 4 are fixedly connected to the bed frame 1 through bolts, and the upper ends are connected to the lifting seat 2, which is used to drive the overall lifting of the lifting seat, adjust the height of the bed surface, and facilitate medical care operations or patients getting on and off the bed.

[0022] A mounting seat 6 is fixed below the lifting seat 2, and a number of support electric push rods 7 are evenly installed on the mounting seat 6. The support electric push rods 7 are small linear electric push rods, the lower ends of which are fixed on the mounting seat 6, and the upper ends are connected to cylindrical support columns 5. A plurality of support columns 5 form a dense array, arranged in a regular rectangle, and the center distance between adjacent support columns is 2-3 cm to ensure high-density support and fine adjustment ability. The tops of the support columns 5 are covered with a flexible medical silicone layer, the thickness of the silicone layer is 2-5 mm, and the surface is provided with breathable micropores with a pore diameter of 0.5-1 mm and a spacing of 2-3 mm, which can improve breathability and use comfort.

[0023] A thin-film pressure sensor, model FlexiForce A201, is fixedly installed at the top end of each support column 5 for collecting the force magnitude at the corresponding point. Multiple groups of motion sensors are symmetrically installed around the bed frame 1. Preferably, ADXL345 three-axis acceleration sensors are used, and the installation spacing is 50-80 cm, which is used to monitor the patient's body position or movement changes. A control box 3 is arranged on one side of the bed frame 1. The control box 3 internally is provided with a main control circuit board, a power management module, and a signal conditioning circuit. An STM32F407 microcontroller chip is soldered on the main control circuit board, and its GPIO pins are connected to the motor drivers of all support electric push rods 7 through FPC cables, which can accurately control the lifting actions of each support column.

[0024] The control box 3 is also integrated with an AD620 instrumentation amplifier for processing sensor signals. Its input terminal is connected to the pressure sensors at the top of each support column through shielded twisted-pair wires, and the output terminal is connected to the ADC pin of the microcontroller. The motion sensors communicate with the main control circuit board through the I2C or SPI interface. Removable vital sign monitoring bands are provided on both sides of the bed frame 1, which are embedded with MAX30102 reflective optical sensors and TMP117 temperature sensors, and wirelessly communicate with the control system through the DA14580 Bluetooth module to achieve non-wearable heart rate, blood oxygen and body temperature data collection.

[0025] To further improve the usability and system interaction ability, an embedded touch display screen is added to the control box or the bed body in the present invention. The touch screen communicates with the main control chip through the SPI or UART bus to achieve the following functions: First, it can display the working status and pressure distribution of the support columns on the entire bed surface in real time with a graphical interface. Users can select different areas (such as the head, back, legs, etc.) through touch operations to adjust the height of the corresponding support columns individually or in batches for area control; Second, it can display the heart rate, blood oxygen and body temperature data collected by the vital sign monitoring band in real time, and the data refresh frequency and display mode can be set; Third, it has an alarm function. When the pressure sensor continuously detects abnormal pressure in a certain area (such as continuous high pressure), or the vital sign indicators exceed the warning threshold (such as abnormal heart rate, too high body temperature), the system will automatically give an audible and visual alarm to remind the medical staff to handle it in time and improve the nursing safety. The display control system has a simple structure and intuitive operation, and can be managed locally or integrated with the hospital information system, with good practicability and scalability.

[0026] When the patient lies on the nursing bed, the pressure sensors at the top of the support columns collect the force information of each contact point in real time, and send the data to the main control circuit board through the conditioning circuit. The main control system analyzes the pressure distribution of each point through an algorithm, and sends control commands to the corresponding support electric push rods 7 to dynamically adjust the height of the support columns, so that the bed surface forms a support structure that fits the patient's body curve, realizing pressure equalization and decompression. If the patient makes movements such as turning over or side shifting, the motion sensors around the bed frame can capture the posture change signal in the first time. The system judges the body position change area accordingly and controls the relevant support columns to make a quick response adjustment, so that the support surface always maintains dynamic matching with the patient's body position, effectively reducing the risk of pressure sores and improving the comfort level.

[0027] Furthermore, the main body of the main electric push rod 4 is fixedly installed on the four corner support parts of the bed frame 1 by bolts or welding, and the push rod end of the main electric push rod 4 is fixedly connected to the four corners of the lifting seat 2 through the connecting flange, and the direction of the push rod action axis is consistent with the vertical direction of the bed frame 1. When powered on, the main electric push rod 4 can be synchronously extended and retracted to drive the lifting seat 2 to move up and down as a whole, so as to adjust the height of the nursing bed surface within a certain range. The adjustment stroke is usually 30 to 70 cm, which can adapt to patients of different body shapes and nursing operation requirements. The lifting process is smooth and does not require manual intervention, which improves nursing efficiency and safety.

[0028] The bottom surface of the lifting seat 2 is fixed with a metal frame or a rigid mounting plate as a mounting seat 6, which is used to carry and fix a plurality of supporting electric push rods 7. The bottom end of the supporting electric push rod 7 is fixedly connected to the mounting seat 6 by a bolt structure or a latch structure, and the push rod end is connected to the bottom of the corresponding supporting column 5. The connection part can be reinforced with a slot-type positioning structure and screws to ensure that the supporting column is stable and reliable during the lifting process without shaking.

[0029] The support columns 5 are all made of high-strength medical plastic or aluminum alloy, with a cylindrical structure, arranged in a regular rectangular array, and the array layout is evenly distributed on the upper surface of the lifting seat 2. The center spacing between adjacent support columns 5 is controlled between 2 and 3 cm to ensure that high-density independent support units are formed at different contact points on the patient's body. Through the reasonable design of the support column spacing, the bed surface can be accurately fitted to the human body curve without sacrificing air permeability and softness. The support column array constitutes a dynamic support surface composed of multiple vertical drive units under overall control, which can be adjusted independently or in conjunction with the instructions output by the control system, so that the bed surface can adapt to different patient positions and achieve effective anti-pressure sore support function.

[0030] Furthermore, the top of the support column 5 is covered with a layer of flexible medical silicone layer, the thickness of which is 2 to 5 mm, to improve the softness and comfort of the patient when in contact, and to avoid secondary pressure injuries caused by the support column surface being too hard. The silicone layer is fixed to the top of the support column by hot pressing or bonding, and is not easy to fall off. In order to ensure the air permeability and humidity regulation function of the bed surface, the surface of the silicone layer is evenly provided with breathable micropores, the micropore diameter is 0.5 to 1 mm, and the hole spacing is 2 to 3 mm, which can effectively improve the air circulation on the surface of the bed, reduce the accumulation of sweat and moisture, and thus reduce the incidence of pressure sores. It is suitable for patients who are bedridden for a long time.

[0031] The control system is centrally integrated into the control box 3 on one side of the bed frame. The control box 3 is made of metal or ABS engineering plastic shell, with a compact structure, which is convenient for installation and maintenance. Inside the control box 3, there are a main control circuit board, a power management module and a signal conditioning circuit. On the main control circuit board, an STM32F407 microcontroller chip is installed. This chip has a high-performance ARM Cortex-M4 core, which can process multi-channel sensor data and perform real-time logical judgment and PWM signal output. The GPIO pins of the chip are connected to the motor drivers of each support electric push rod 7 through FPC cables to achieve independent control of each support column. The signal conditioning circuit part selects an AD620 instrumentation amplifier to amplify the weak electrical signals from the pressure sensors and improve the acquisition accuracy; its input end is connected to the pressure sensors at the top of each support column 5 by shielded twisted pair wires, and the output end is connected to the ADC pin of the microcontroller.

[0032] In addition, the vital sign monitoring module is connected to the main control chip through the I2C bus and can stably transmit data such as heart rate, blood oxygen and body temperature. The power management module has a set of XL6009 DC-DC buck converters built in. Its input end is connected to the external 24V power supply interface, and the output end provides two voltages of 5V and 3.3V, which are used for sensors, control circuits and wireless modules respectively. On the front side of the control box 3, there are LED status indicators and emergency stop buttons, which are convenient for operators to monitor the operation status in real time and perform emergency operations; on the back side of the control box, there are RS485 communication interfaces and power supply interfaces, which support remote communication and multi-device linkage control, and are suitable for integrated applications in intelligent wards or centralized monitoring systems.

[0033] Furthermore, in order to realize the dynamic monitoring and support adjustment control of the patient's body position and vital signs, this device adopts a collaborative layout of multiple types of sensors. The pressure sensor selects a FlexiForce A201 thin-film pressure sensor, which has the characteristics of thin thickness, fast response, simple installation, etc. It is installed at the top of the support column 5 and is fixed under the silicone layer by bonding or snap-in pressing, corresponding to the area in direct contact with the patient's body. The range of this sensor is 0~100N, and the accuracy is ±2.5%FS. It can collect the force change of each support point of the patient's body in real time. The output of the sensor is an analog voltage signal, which is amplified by the AD620 instrumentation amplifier in the signal conditioning circuit and then input to the ADC channel in the main control circuit board for subsequent calculation and judgment of the support adjustment strategy.

[0034] The motion sensor is a three-axis acceleration sensor of the ADXL345 model, which is packaged in a patch type and is arranged on the four peripheral edges of the bed frame 1. The installation spacing is 50-80 cm, and the quantity can be adjusted according to the bed size. Each motion sensor can sense the acceleration changes in the X, Y, and Z directions, so as to judge the motion behaviors of the patient, such as turning over, lateral turning, raising the hand, etc. The system quickly identifies the body position change area by comparing the acceleration data changes at different time points, and combines with the pressure distribution change trend to accurately locate the support adjustment target area.

[0035] The vital sign monitoring part includes detachable monitoring bands installed on both sides of the bed frame, which are embedded with a MAX30102 reflective optoelectronic sensor and a TMP117 temperature sensor. The MAX30102 has dual-wavelength light sources of 660 nm red light and 880 nm infrared light, and uses the PPG photoplethysmography method to collect heart rate and blood oxygen saturation, and can be monitored by fitting to the skin. The TMP117 is a medical-grade patch type digital temperature sensor, with a measurement range of 25°C to 50°C and an accuracy of ±0.1°C, which is used to monitor the patient's body surface temperature. The data collected by the above vital sign sensors are sent to the main control system through a Bluetooth 5.0 low-power wireless communication module (model DA14580). The transmission distance of the Bluetooth module is 10 meters, which can stably cover the communication range of the hospital bed control system to ensure real-time data transmission without interfering with other devices.

[0036] Furthermore, in order to realize the continuous monitoring of the vital signs of elderly patients without wearing wearable devices, an integrated vital sign acquisition unit is set in the support columns 5 in the head, hand, and foot areas of the device. The acquisition unit selects a reflective optical sensor and a patch type temperature sensor with a compact structure and sensitive response, and is fixed and integrated by embedding the top structure of the support column. The support column 5 in the head area is embedded with a MAX30102 optoelectronic sensor and a TMP117 temperature sensor, which are used to collect heart rate, blood oxygen, and body temperature data in the natural contact state of the patient's head; the MAX30102 uses dual-wavelength light sources (660 nm red light and 880 nm infrared light), and detects the blood flow rhythm through the transmissive optical signal to generate a pulse wave signal to calculate the heart rate and SpO2.

[0037] The support columns in the hand and foot areas are also provided with induction windows in contact with the skin. The window material is medical-grade flexible silica gel, and an optical window structure is arranged below it to ensure the stability of the reflection optical path and the quality of the measurement signal. The top of each induction column is connected to the sensor module at the bottom through a flexible circuit board. The module is internally provided with a micro signal conditioning chip and is aggregated to the main control circuit board through the I2C bus or the SPI bus. To avoid data interference, each group of acquisition units is configured with an independent time slice polling mechanism to upload data at different time points in turn.

[0038] For the convenience of data transmission and system compatibility, the above-mentioned collected data is sent to the main control system via the Bluetooth 5.0 low-power wireless module DA14580, and can also be connected to the hospital monitoring system through the RS485 interface to achieve visual remote viewing of the data. Since the sensor is integrated into the fixed structure, the patient can complete the vital sign measurement in the natural lying state without additional wearable devices, which is especially suitable for the elderly, postoperative patients or those with unclear consciousness, improving the nursing quality and efficiency, and at the same time reducing the risk of measurement failure caused by loosening, loss or improper wearing of traditional wearable devices. The structure is designed compactly, the installation method is clear, it is easy to manufacture and maintain, and has good promotion and application value.

[0039] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An intelligent dynamic anti-pressure sore nursing bed, comprising a bed frame (1), a lifting seat (2), a support column array and a control system, characterized in that: The lifting seat (2) is arranged on the top of the bed frame (1), and an electric lifting mechanism is provided at the bottom of the lifting seat (2), wherein the electric lifting mechanism comprises at least four main electric push rods (4), and the main electric push rods (4) are respectively arranged at the four corners of the bed frame (1); The support column array is composed of a plurality of support columns (5), each support column (5) is a cylindrical structure, and a supporting electric push rod (7) is arranged at the bottom of each support column (5); The control system comprises a main control circuit board, a pressure sensor and a motion sensor; a control box (3) is installed at the side end of the bed frame (1); the main control circuit board is installed in the control box (3); the pressure sensor is fixed to the top of the support column (5); and the motion sensor is installed around the bed frame (1); Both sides of the bed frame (1) are provided with detachable vital sign monitoring belts, wherein the vital sign monitoring belts are integrated with optical sensors and temperature sensors, and communicate with the control system via a wireless transmission module.

2. The intelligent dynamic anti-pressure sore nursing bed according to claim 1, characterized in that: The main body of the main electric push rod (4) is fixedly connected to the bed frame (1), and the end of the main electric push rod (4) is fixedly connected to the lifting seat (2).

3. The intelligent dynamic anti-pressure sore nursing bed according to claim 1, characterized in that: The bottom of the lifting seat (2) is fixedly connected to a mounting seat (6), the bottom end of the supporting electric push rod (7) is fixedly connected to the mounting seat (6), and the top end of the supporting electric push rod (7) is fixedly connected to the corresponding supporting column (5).

4. The intelligent dynamic anti-pressure sore nursing bed according to claim 1, characterized in that: The support columns (5) are arranged in a rectangular array, and the center spacing between adjacent support columns (5) is 2-3 centimeters.

5. The intelligent dynamic anti-pressure sore nursing bed according to claim 1, characterized in that: The top of the support column (5) is covered with a medical silicone layer, the thickness of the medical silicone layer is 2-5 mm, and the surface is provided with evenly distributed air-permeable micropores, the pore diameter of the air-permeable micropores is 0.5-1 mm, and the pore spacing is 2-3 mm.

6. The intelligent dynamic anti-pressure sore nursing bed according to claim 1, characterized in that: The control box (3) is provided with a main control circuit board, a power management module and a signal conditioning circuit; an STM32F407 microcontroller chip is welded on the main control circuit board, and the GPIO pins of the chip are connected to the motor drivers of each supporting electric push rod (7) through an FPC cable; the signal conditioning circuit comprises an AD620 instrument amplifier, the input end of which is connected to the pressure sensor at the top of the support column (5) through a shielded twisted pair cable, and the output end is connected to the ADC pin of the microcontroller chip; the vital sign monitoring module is connected to the microcontroller chip through an I2C bus; the power management module comprises an XL6009 DC-DC converter, the input end of which is connected to an external 24V power supply interface, and the output end provides 5V and 3.3V voltages respectively; the control box (3) is provided with an LED status indicator and an emergency stop button on the front side, and an RS485 communication interface and a power supply interface on the rear side.

7. The intelligent dynamic anti-pressure sore nursing bed according to claim 1, characterized in that: The pressure sensor is a thin film pressure sensor, model FlexiForce A201, with a range of 0-100N and an accuracy of ±2.5%FS; the motion sensor is a three-axis acceleration sensor, model ADXL345, with an installation spacing of 50-80cm; the optical sensor is a reflective photoelectric sensor, model MAX30102, which includes dual light sources of red light (660nm) and infrared light (880nm); the temperature sensor is a medical-grade patch temperature sensor, model TMP117, with a measurement range of 25℃-50℃ and an accuracy of ±0.1℃; the wireless transmission module is a Bluetooth 5.0 low-power module, model DA14580, with a transmission distance of 10 meters.

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