ECG test method and system of intelligent wearable device

Abstract

The invention discloses an ECG test method and system for intelligent wearable equipment, and belongs to the technical field of intelligent wearing. According to the method, independent ECG detection without APP dependence is achieved through hardware closed-loop design, and the method comprises the steps that a test button and a metal shell form a trigger loop, an inner surface electrode and an outer surface electrode are used for forming a differential signal acquisition access, local analysis is completed through a main control chip after processing is conducted through a differential amplification circuit, and the test state is fed back in real time through an LED indicator lamp. The system supports data local storage in a network-free environment and automatic transmission during Bluetooth connection. The innovation points are as follows: 1) one-key triggering is realized through hardware interaction of the button, the metal shell and the electrode; 2) the signal quality is improved by adopting a three-electrode framework; and (3) intelligent judgment logic is built in (an effective signal is generated at an R wave interval of 0.6-1.5 seconds). According to the method, the independence and scene adaptability of ECG testing are remarkably improved, and the method is particularly suitable for outdoor scenes such as sports and first aid.

Description

1. Technical Field

[0001] This invention relates to the technical field of smart wearable devices, and more specifically, to an ECG (electrocardiogram) testing method and system for devices such as smart bracelets, smart watches, and smart rings. By optimizing the connection relationships and interaction logic of smart ring hardware components (such as electrodes, buttons, and main control chips), an "app-independent ECG testing system" is constructed, enabling a convenient and autonomous testing process. 2. Background Technology

[0002] The core requirement for smart wearable devices with ECG functions is "independent and efficient ECG testing", but existing solutions have the following shortcomings: 1. Strong system coupling:

[0003] The ECG test process is deeply bound to the mobile phone APP, and the test must be started and data transmitted through the APP. The device's own hardware logic (such as buttons, electrodes, and main control chip) does not form an independent test closed loop.

[0004] 2. Poor scene adaptability:

[0005] When there is no APP support (such as the phone is not turned on or there is no network outdoors) or the Bluetooth connection is abnormal, the ECG function is completely disabled and cannot meet the needs of scenarios such as sports and first aid.

[0006] 3. The operation process is complicated:

[0007] It is necessary to manually open the app, pair Bluetooth, and trigger the test, which is a complicated process. It is difficult for users to judge the effectiveness of the test through the device's own feedback, and invalid operations are prone to occur. 3. Summary of the Invention

[0008] (1) Purpose of the invention

[0009] Build a "hardware-driven ECG test system" by reconstructing the component connections (buttons, metal housing, electrodes, main control chip, etc.) and interaction logic of smart wearable devices to achieve:

[0010] Independent testing without APP dependency;

[0011] Intuitive status feedback and intelligent data management;

[0012] ECG function adapted to complex scenarios such as sports and outdoor activities.

[0013] (2) Technical solution

[0014] Take smart ring as a typical embodiment, combined with the attached Figure 1-3 , build an ECG test system and explain the test method:

[0015] 1. System architecture and component connections (related figures)

[0016] The ECG test system of the smart ring includes the following core components and their connections (corresponding to the attached figure):

[0017]

[0018] 2. ECG test method (system-driven process)

[0019] (1) “Triggering stage (hardware closed loop)”:

[0020] The user wears the smart ring, and ECG electrode 1 (205) and ECG electrode 2 (206) are in contact with the skin (forming a bioelectric reference terminal); when pressing the test button (302), the hand contacts the button (302) and the metal housing (400) at the same time, triggering the "hardware-driven ECG acquisition process":

[0021] The ECG electrode 3 (301) associated with the metal housing (400) and the ECG electrode 1 (205) / ECG electrode 2 (206) form a closed circuit through the human body;

[0022] The differential amplifier circuit (202) automatically collects bioelectric signals without the need for APP intervention.

[0023] (2) “Processing and feedback stage (local logic)”:

[0024] The main control chip (201) processes the collected signal and drives the LED indicator (303) according to the validity of the signal:

[0025] Valid signal: LED flashes 2 times per second;

[0026] Invalid signal (such as wearing hand pressing, poor contact): LED is off or flashes 0.5 times / second.

[0027] (3) “Data management stage (intelligent collaboration)”

[0028] · Not connected to the APP: ECG data (waveform, characteristic value) is stored in the storage unit (204);

[0029] Connect to APP: The Bluetooth module (203) automatically recognizes the pairing, triggers the storage data to be uploaded to the APP, and then synchronized to the background server.

[0030] (3) Beneficial effects

[0031] 1. System independence: Build a hardware closed loop of "button-metal housing-electrode-main control chip", free from APP and Bluetooth dependence, and realize "device autonomous testing";

[0032] 2. Scenario adaptability: Supports offline scenarios such as sports and outdoor activities, and uses local hardware logic (differential amplifier circuit, main control chip) to complete ECG testing;

[0033] 3. Intuitive feedback: The LED indicator light provides real-time feedback on "valid collection, invalid operation" status through different flashing modes, reducing user learning costs;

[0034] 4. Data integrity: The combination of local storage (storage unit 204) and automatic transmission (Bluetooth module 203) relies on the intelligent control of the main control chip (201) to ensure that ECG data can be traced in all scenarios. IV. Description of the Figures

[0035] (1) List of drawings and descriptions

[0036] 1. Attachment Figure 1 : Schematic diagram of the overall structure of the smart ring

[0037] The "system layout" of the ring body is displayed: ECG electrode 1 (205), ECG electrode 2 (206) (inner surface), ECG electrode 3 (301), test button (302), LED indicator light (303) (outer surface), and the metal shell (400) wraps the main control circuit board, clarifying the physical distribution of the system components.

[0038] 2. Attachment Figure 2 :Button area details

[0039] The “trigger subsystem structure” is presented: the insulation setting of the test button (302) and the metal shell (400), and the conductive trigger area formed by the metal shell surrounding the button, explaining the hardware logic of “pressing to form a loop”.

[0040] 3. Attachment Figure 3 :ECG test system connection diagram

[0041] The diagram shows the "system circuit architecture": the signal connection between the button, metal housing, electrode and differential amplifier circuit (202), the control connection between the main control chip (201) and the LED indicator (303), storage unit (204), Bluetooth module (203), and the interaction path with the mobile phone APP / gateway, which fully presents the system's electrical signal flow. V. Specific Implementation Methods

[0042] Taking the ECG test system of smart ring as an example, combined with the attached Figure 1-3 , explain the "system implementation and testing process":

[0043] 1. System assembly and initialization

[0044] Hardware integration: according to the attached Figure 1The ring is provided with an ECG electrode 1 (205) and an ECG electrode 2 (206) (medical conductive silicone) installed on the inner surface; a test button (302) and an ECG electrode 3 (301) (integrated with a metal shell 400 and made of stainless steel) are installed on the outer surface; and a main control circuit board is integrated with a differential amplifier circuit (202), a main control chip (201), a storage unit (204), a Bluetooth module (203), and an LED indicator light (303).

[0045] Circuit debugging: The metal housing (400) and the ECG electrode 3 (301) are connected to the signal input terminal of the differential amplifier circuit (202); the ECG electrode 1 (205) is connected to the other signal input terminal of the differential amplifier circuit (202); the ECG electrode 2 (206) is connected to the reference terminal of the differential amplifier circuit (202); the main control chip (201) completes the hardware adaptation with each module and configures the signal acquisition and processing parameters.

[0046] 2. ECG test system full process

[0047] (1) “User wearing and triggering preparation”:

[0048] The user wears the ring on the ring finger, and the ECG electrode 1 (205) and the ECG electrode 2 (206) are in stable contact with the skin (forming a bioelectric reference end); the other hand (such as the index finger) is close to the test button (302) area.

[0049] (2) “Hardware-driven test start”:

[0050] Press the test button (302) → the hand touches the button and the metal housing (400) → the ECG electrode 3 (301) and the ECG electrode 1 (205) / ECG electrode 2 (206) form a closed loop through the human body → the differential amplifier circuit (202) automatically collects the bioelectric signal → the main control chip (201) starts the signal processing process.

[0051] (3) “Local logic status feedback”:

[0052] The main control chip (201) extracts the R wave characteristics and determines the signal validity:

[0053] Valid (R wave interval 0.6-1.5 seconds): drive the LED indicator (303) to flash 2 times / second for 3 seconds;

[0054] Invalid (e.g., pressing with the hand wearing the device, but the circuit does not cross the limb): the driving LED indicator (303) turns off, or flashes at 0.5 times / second.

[0055] (4) “Intelligent Data Management”

[0056] When the mobile phone is not connected: ECG data (waveform, heart rate) are stored in the storage unit (204), overwriting the old data (retaining the latest 100 sets);

[0057] Connecting to a mobile phone: the Bluetooth module (203) identifies the APP pairing request → the main control chip (201) triggers the storage unit (204) to upload data → the ECG data is synchronized to the APP, and a test report is generated and uploaded to the server.

Claims

1. An ECG test system for a smart wearable device, characterized in that: include: The main body of the smart wearable device, taking a smart ring as an example, comprises a ring shell (400), wherein an ECG electrode 1 (205) and an ECG electrode 2 (206) are provided on an inner side (401) of the ring shell (400), and an ECG electrode 3 (301), a button (302) and an LED indicator light (303) are provided on an outer side (402); o A main control circuit board (100), comprising an outer side (101) and an inner side (102), wherein the outer side (101) integrates a circuit adapted to the ECG electrode 3 (301), a button (302), and an LED indicator light (303), and the inner side (102) integrates a differential amplifier circuit (202), a main control chip (201), a Bluetooth module (203), and a storage unit (204); o Connection relationship: ECG electrode 1 (205) and ECG electrode 2 (206) are connected to the differential amplifier circuit (202), ECG electrode 3 (301) and ring housing (400) are also connected to the differential amplifier circuit (202), the differential amplifier circuit (202) is connected to the main control chip (201), the main control chip (201) is respectively connected to the LED indicator light (303), the Bluetooth module (203), and the storage unit (204), and the Bluetooth module (203) is used to interact with the mobile phone APP or gateway.

2. The ECG test system for a smart wearable device according to claim 1, characterized in that: The ECG electrode 1 (205) and the ECG electrode 2 (206) are made of medical-grade conductive silicone material. The ECG electrode 3 (301) and the ring shell (400) are integrally formed and made of stainless steel. The ring shell (400) is connected to the input end of the differential amplifier circuit (202) through a flexible circuit board. The ECG electrode 1 (205) is connected to the other input end of the differential amplifier circuit (202), and the ECG electrode 2 (206) is connected to the reference end of the differential amplifier circuit (202).

3. A testing method based on the ECG testing system according to claim 1, characterized in that: The following steps are involved: o Loop triggering: the user wears the smart ring, and makes ECG electrode 1 (205) and ECG electrode 2 (206) contact the skin of the wearing finger. The other hand presses the button (302) and touches the ring shell (400), so that ECG electrode 3 (301), ECG electrode 1 (205) / ECG electrode 2 (206) form a closed single-conductor loop through the human body, triggering ECG signal acquisition; o Signal processing: The differential amplifier circuit (202) collects the bioelectrical signal, amplifies it, filters it, and transmits it to the main control chip (201); o Status feedback: the main control chip (201) determines the validity of the signal. If it is valid, the LED indicator (303) is driven to flash at a frequency of 2 times / second. If it is invalid, the LED indicator (303) is driven to flash at a frequency of 0.5 times / second or is turned off; o Data management: When the APP is not connected, the ECG data is temporarily stored in the storage unit (204); after the APP is connected, the main control chip (201) triggers the data transmission to the APP through the Bluetooth module (203), and then the APP uploads it to the background server.

4. The testing method according to claim 3, wherein: The main control chip (201) determines whether the collected signal is valid by detecting whether the R wave interval is within the range of 0.6-1.5 seconds.

5. The testing method according to claim 3, wherein: The storage unit (204) is a flash memory chip of at least 8MB, supporting the storage of at least 100 sets of ECG test data; the Bluetooth module (203) is a BLE5.0 module, which automatically triggers the storage data transmission and clears the storage unit (204) when detecting the connection of an external device.

6. The testing method according to claim 3, characterized in that: The main control chip (201) performs analog-to-digital conversion on the output signal of the differential amplifier circuit (202) at a sampling rate of 250 Hz, executes a bandpass filtering algorithm to filter interference outside the range of 0.05-100 Hz, extracts characteristic points of R wave, P wave, and T wave, and calculates parameters such as heart rate and RR interval, and stores them in a storage unit (204).

7. The ECG testing system for a smart wearable device according to claim 1, characterized in that: A window is provided on the outer side (402) of the ring housing to expose the button (302) and the LED indicator light (303). The inner side (401) of the ring housing is sealed with transparent glue, and only the inner side (102) of the main control circuit board is exposed. The entire device is sealed with waterproof epoxy resin, and the protection level reaches IP67.

8. The testing method according to claim 3, wherein: The button (302) is made of conductive silicone material and has an anti-slip texture on its surface. The surface of the ring shell (400) is passivated to form an antibacterial and anti-corrosion layer. The closed ECG signal acquisition loop is formed through contact with human skin without the need for an additional conductive medium.

9. The testing method according to claim 3, characterized in that: The invention also includes a calibration step and an abnormality alarm step. When the device is used for the first time or a signal abnormality is detected, the main control chip (201) executes a self-calibration program to adjust the gain parameters of the differential amplifier circuit (202); when the heart rate exceeds a preset threshold (such as 180 beats / minute) or the ECG waveform shows ventricular fibrillation characteristics, the LED indicator light (303) is triggered to flash continuously and vibrate to alarm.

10. The ECG testing system for a smart wearable device according to claim 1, characterized in that: The smart wearable device is a smart ring, and the main control circuit board (100) and the ring shell (400) are both ring-shaped and suitable for wearing on fingers.

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