Flexible wearable instant detection device

Abstract

The invention provides a flexible wearable instant detection device. The flexible wearable instant detection equipment comprises a flexible circuit structure and an anti-interference antenna assembly, the flexible circuit structure comprises a flexible circuit layer and a thin film electrode type sensor, and the sensor is printed on the flexible circuit layer; the anti-interference antenna assembly comprises a multi-band conformal antenna and a frequency selection surface layer, the multi-band conformal antenna is embedded in the equipment middle frame, and the frequency selection surface layer is arranged on the equipment back shell. According to the device, high-comfort wearing is achieved through the flexible printed circuit and the conformal antenna technology, the multi-band anti-interference design and the self-checking circuit module are combined, and the signal stability and the device reliability are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of biomedical sensing technology / wearable health monitoring technology, and specifically relates to a flexible wearable instant detection device. BACKGROUND

[0002] With the progress of medical technology and the increasing demand for health management, flexible wearable POCT (point-of-care testing) devices have developed rapidly in recent years. Such devices can detect physiological indicators such as blood glucose, blood pressure, and heart rate in real time and conveniently, and have important application value in daily health monitoring, disease prevention, and on-site medical diagnosis. However, this field faces many technical challenges in circuit and antenna design, limiting the further improvement of device performance.

[0003] 1. Increasing demand for flexible wearable devices: People's demand for convenience and comfort of wearable devices is increasing, and flexibility has become a key factor. Flexible materials can better fit the complex surface of the human body, reduce the foreign body sensation when worn, and improve the willingness of users to wear for a long time. However, this poses new challenges to the design of circuits and antennas, and traditional rigid circuits and antennas cannot meet the requirements of flexibility and wearability. Some wearable devices attempt to use flexible printed circuit boards (FPC) to achieve the flexibility of circuits. For example, FPC is used as a circuit substrate, and simple sensors and processors are integrated on it. However, this design only replaces rigid circuits with flexible materials, and does not fully consider the signal stability of flexible circuits in complex environments and the cooperative work with antennas. The circuit layout and line design are not optimized for flexibility and wearability, and the lines are prone to breakage during long-term bending, affecting the reliability of the device.

[0004] 2. The Needs of Communication Technology Development: Modern wearable devices need to interact with various devices, such as smartphones and tablets, to achieve data sharing and remote medical functions. This requires devices to have multi-band communication capabilities, especially with the popularization of 5G technology, the need for wearable devices to access high-speed networks is becoming increasingly urgent. At the same time, the electromagnetic environment in which wearable devices operate is becoming increasingly complex, with numerous sources of electromagnetic interference, such as Wi-Fi signals and mobile phone signals, placing higher demands on the antenna's anti-interference capabilities. In terms of antenna design, some wearable devices use miniaturized antennas to meet the device's size requirements. For example, some smart bracelets use built-in Bluetooth antennas. However, most of these antennas only support single-band communication, such as only supporting the Bluetooth band (2.4GHz-2.485GHz), which cannot meet the multi-band communication requirements of 5G and other technologies. Moreover, their protection against electromagnetic interference is insufficient; in complex electromagnetic environments, signals are easily interfered with, leading to communication interruptions or data transmission errors. The antenna design is relatively independent of other parts of the device, failing to fully consider the synergistic effect with the mid-frame, back shell, and other structures, and thus failing to effectively utilize these structures to improve antenna performance and anti-interference capabilities. Summary of the Invention

[0005] The technical problem addressed by this application is: how to provide a flexible wearable real-time detection device that is highly comfortable, highly reliable, and has strong communication performance.

[0006] This application provides a flexible wearable real-time detection device, the flexible wearable real-time detection device comprising:

[0007] A flexible circuit structure, comprising a flexible circuit layer and a thin-film electrode type sensor, wherein the sensor is printed on the flexible circuit layer;

[0008] An anti-interference antenna assembly, comprising a multi-band conformal antenna and a frequency selective surface layer, wherein the multi-band conformal antenna is embedded in the device frame and the frequency selective surface layer is disposed on the device back cover.

[0009] Optionally, the flexible circuit layer includes a flexible substrate and serpentine copper traces formed on the flexible substrate.

[0010] Optionally, the flexible substrate is a polyimide substrate, the thickness of the flexible substrate is less than or equal to 0.2 mm, and the bending radius of the flexible substrate is less than or equal to 5 mm.

[0011] Optionally, the multi-band conformal antenna is a dual-band dipole antenna, and the frequency bands of the multi-band conformal antenna cover the 5G frequency band and the Bluetooth frequency band.

[0012] Optionally, the anti-interference antenna assembly further includes a dynamic frequency band switching circuit, which is used to switch the frequency band of the multi-band conformal antenna.

[0013] Optionally, the reflection coefficient of the frequency-selective surface layer is less than or equal to -20dB.

[0014] Optionally, the flexible wearable instant detection device further includes a self-test circuit and an automatic calibration circuit. The self-test circuit is used to detect the impedance of the sensor, and the automatic calibration circuit is used to adjust the signal amplification factor of the signal processing chip according to the detected impedance.

[0015] Optionally, the sensor includes a blood glucose sensor and a blood oxygen sensor.

[0016] The flexible wearable real-time detection device provided in this application has the following technical effects:

[0017] The device achieves high wearability through flexible printed circuits and conformal antenna technology, and improves signal stability and device reliability by combining multi-band anti-interference design and self-test circuit module. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a flexible wearable real-time detection device according to one or more embodiments.

[0019] Figure 2 This is a schematic diagram of the self-test and automatic calibration process of a flexible wearable real-time testing device according to one or more embodiments. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] Before describing the various embodiments of this application in detail, the technical concept of this application is first briefly described: Current flexible wearable real-time detection devices suffer from problems such as low comfort, low reliability, and poor communication performance. Therefore, this application provides a flexible wearable real-time detection device. The key improvements lie in employing a flexible circuit structure and conformal antenna design to achieve a close fit between the device and the curved surface of the human body, using a multi-band antenna and adding a frequency-selective surface layer to expand the antenna coverage band and improve signal anti-interference capabilities, thereby improving the device's communication performance. The specific principles of the flexible wearable real-time detection device of this application will be described below with reference to more embodiments.

[0022] Specifically, such as Figure 1As shown, the flexible wearable instant detection device in this embodiment includes a flexible circuit structure and an anti-interference antenna assembly. The flexible circuit structure includes a flexible circuit layer and a thin-film electrode type sensor, with the sensor printed on the flexible circuit layer. The anti-interference antenna assembly includes a multi-band conformal antenna and a frequency-selective surface layer. The multi-band conformal antenna is embedded in the device's frame, and the frequency-selective surface layer is disposed on the device's back cover. The sensor uses a thin-film electrode, directly printed on the FPC surface to reduce contact impedance. The sensor includes a blood glucose sensor and a blood oxygen sensor.

[0023] In one or more embodiments, the flexible circuit layer includes a flexible substrate and serpentine copper traces formed on the flexible substrate, with the serpentine trace design enhancing ductility. Exemplarily, the flexible substrate is a polyimide substrate with a thickness less than or equal to 0.2 mm and a bending radius less than or equal to 5 mm. The serpentine traces have a width of 50 micrometers and a spacing of 100 micrometers.

[0024] The flexible circuit structure also includes a signal processing chip, which processes the detection signals from each sensor.

[0025] In one or more embodiments, the multi-band conformal antenna is a dual-band dipole antenna, and the frequency bands of the multi-band conformal antenna cover the 5G band and the Bluetooth band. The anti-interference antenna assembly also includes a dynamic band switching circuit, which is used to switch the frequency bands of the multi-band conformal antenna to avoid co-channel interference.

[0026] The dynamic frequency band switching circuit employs a dynamic anti-interference algorithm, which automatically selects the optimal communication frequency band based on environmental spectrum scanning and uses adaptive filtering to eliminate in-band noise.

[0027] For example, the reflection coefficient of the frequency-selective surface layer is less than or equal to -20dB, and the frequency-selective surface layer can suppress out-of-band interference.

[0028] Currently, most wearable POCT devices have shortcomings in sensor monitoring and calibration. They typically lack integrated real-time monitoring of sensor impedance changes and cannot perform automatic calibration. During use, if sensor performance drifts, users can only resolve the issue through manual calibration or device replacement, which is cumbersome and cannot guarantee real-time accuracy. For example, a common home wearable blood glucose monitoring device requires users to perform manual calibration periodically using calibration solution. If calibration is not performed promptly, the test results will show significant deviations, affecting the user's assessment of their health.

[0029] Therefore, the flexible wearable real-time detection device of this embodiment also includes a self-test circuit and an automatic calibration circuit. The self-test circuit is used to detect the impedance of the sensor, and the automatic calibration circuit is used to adjust the signal amplification factor of the signal processing chip according to the detected impedance. Specifically, as... Figure 2 As shown, the self-test circuit detects the impedance of the sensor in real time and compares the impedance with a preset threshold. When the deviation exceeds 5%, the calibration mechanism is triggered, that is, the automatic calibration circuit adjusts the signal amplification factor of the signal processing chip to compensate for the impedance change.

[0030] The flexible wearable real-time detection device provided in this embodiment has undergone various experimental tests:

[0031] (1) Mechanical performance test: The impedance change of the flexible circuit is less than 2% after 100,000 bending cycles.

[0032] (2) Communication performance test: In a complex electromagnetic environment, the signal transmission stability reaches 99.5%.

[0033] (3) Clinical validation: 50 volunteers wore the device continuously for 72 hours, and the detection error was ≤±3%, and the incidence of skin indentation was reduced by 80%.

[0034] Therefore, the flexible wearable real-time detection device provided in this embodiment has the following technical advantages:

[0035] (1) Improved comfort: The bending radius of the flexible circuit is less than or equal to 5mm, and the fit is improved by 60%.

[0036] (2) Enhanced anti-interference capability: The multi-band design increases the signal-to-noise ratio to 30dB and reduces the bit error rate to 0.1%.

[0037] (3) Increased automation: The self-test function reduces the frequency of manual calibration by 90%.

[0038] The specific embodiments of this application have been described in detail above. Although some embodiments have been shown and described, those skilled in the art should understand that modifications and improvements can be made to these embodiments without departing from the principles and spirit of this application as defined by the claims and their equivalents, and such modifications and improvements should also be within the protection scope of this application.

Claims

1. A flexible wearable real-time detection device, characterized in that, The flexible wearable real-time detection device includes: A flexible circuit structure, comprising a flexible circuit layer and a thin-film electrode type sensor, wherein the sensor is printed on the flexible circuit layer; An anti-interference antenna assembly, comprising a multi-band conformal antenna and a frequency selective surface layer, wherein the multi-band conformal antenna is embedded in the device frame and the frequency selective surface layer is disposed on the device back cover.

2. The flexible wearable real-time detection device according to claim 1, characterized in that, The flexible circuit layer includes a flexible substrate and serpentine copper traces formed on the flexible substrate.

3. The flexible wearable real-time detection device according to claim 2, characterized in that, The flexible substrate is a polyimide substrate, the thickness of the flexible substrate is less than or equal to 0.2 mm, and the bending radius of the flexible substrate is less than or equal to 5 mm.

4. The flexible wearable real-time detection device according to claim 1, characterized in that, The multi-band conformal antenna is a dual-band dipole antenna, and its frequency bands cover the 5G band and the Bluetooth band.

5. The flexible wearable real-time detection device according to claim 4, characterized in that, The anti-interference antenna assembly also includes a dynamic frequency band switching circuit, which is used to switch the frequency band of the multi-band conformal antenna.

6. The flexible wearable real-time detection device according to claim 1, characterized in that, The reflection coefficient of the frequency-selective surface layer is less than or equal to -20dB.

7. The flexible wearable real-time detection device according to claim 1, characterized in that, The flexible wearable real-time detection device also includes a self-test circuit and an automatic calibration circuit. The self-test circuit is used to detect the impedance of the sensor, and the automatic calibration circuit is used to adjust the signal amplification factor of the signal processing chip according to the detected impedance.

8. The flexible wearable real-time detection device according to claim 1, characterized in that, The sensors include a blood glucose sensor and a blood oxygen sensor.

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