A multi-layer flexible pulse sensor

Abstract

This invention discloses a multi-layer flexible pulse sensor, comprising, from bottom to top, an X-axis foil strain gauge, a Y-axis foil strain gauge, a Z-axis flexible amplification mechanism, an airbag assembly, and a pressure sensor disposed at the contact surface between the Z-axis flexible amplification mechanism and the airbag assembly. The X-axis foil strain gauge, Y-axis foil strain gauge, and pressure sensor are all connected to a central driving chip via external circuitry. The central driving chip processes the signals, converts them into digital signals, and then sends them to an external terminal device. This invention acquires pulse signals from the radial artery at the wrist by combining multiple layers, improves the detection sensitivity of the Z-axis signal through the flexible amplification mechanism, and enables the acquisition of signals from multiple directions at the detection point. Furthermore, the sensor has a simple structure, is not easily detached, and provides stable and reliable detection results.

Description

Technical Field

[0001] This invention relates to the field of biosensing technology, specifically to a multilayer flexible pulse sensor. Background Technology

[0002] In the field of traditional Chinese medicine (TCM) pulse diagnosis, the accurate identification of pulse information has always been a key research focus. Traditional TCM pulse diagnosis relies on the doctor's fingers pressing on three areas of the patient's arm—cun, guan, and chi—to diagnose the condition by feeling the pulse fluctuations. However, this method suffers from strong subjectivity and difficulty in standardization and quantification. With the rapid development of biomedical detection technology, research on pulse sensors has gradually gained attention, aiming to objectify and quantify the TCM pulse diagnosis process, thereby automating and accelerating diagnosis.

[0003] Traditional pulse sensors mostly acquire signals at a single point, making it difficult to comprehensively reflect the complex changes in the "three parts and nine pulse positions" of the pulse. The pulse is actually a pulsation radiating outwards from the radial artery, triggering various pulsations. Pulse detection is a comprehensive differentiation and classification of pulse signals. Therefore, acquiring various signals at the cun, guan, and chi detection points is crucial for comprehensive pulse diagnosis. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a multilayer flexible pulse sensor.

[0005] Technical solution: The multilayer flexible pulse sensor provided by the present invention includes an X-axis metal foil strain gauge, a Y-axis metal foil strain gauge, a Z-axis flexible amplification mechanism, an airbag assembly, and a pressure sensor disposed on the contact surface between the Z-axis flexible amplification mechanism and the airbag assembly, arranged layer by layer from bottom to top. The X-axis foil strain gauge, Y-axis foil strain gauge, and pressure sensor are all connected to the central drive chip via external circuitry. The central drive chip processes the signals, converts them into digital signals, and then sends them to external terminal devices.

[0006] Furthermore, an insulating substrate is provided at the bottom of the X-axis foil strain gauge, between the X-axis foil strain gauge and the Y-axis foil strain gauge, and at the top of the Y-axis foil strain gauge.

[0007] Furthermore, the X-axis metal foil strain gauge, Y-axis metal foil strain gauge, Z-axis flexible amplification mechanism, and insulating substrate are all integrated into a single structure using hydrogel.

[0008] Furthermore, the X-axis foil strain gauge and the Y-axis foil strain gauge are orthogonally arranged in space to detect the stress in the X-axis and Y-axis directions, respectively.

[0009] Furthermore, both the X-axis foil strain gauge and the Y-axis foil strain gauge are composed of two interconnected fan-shaped strain gauges.

[0010] Furthermore, four Z-axis flexible amplification mechanisms are arranged on the same layer and orthogonally distributed. Each Z-axis flexible amplification mechanism is equipped with a pressure sensor and is connected to the central drive chip.

[0011] Furthermore, the Z-axis flexible amplification mechanism includes a bottom support plate and a top support plate. Lateral transmission linkage mechanisms are provided on both sides between the bottom support plate and the top support plate. The lateral transmission linkage mechanisms include fixing keys fixed to the bottom support plate and the top support plate. Each fixing key is connected to the side sliding keys on both sides through two connecting rods. The two side sliding keys located on the inner side are connected to the Z-axis sliding keys at the upper and lower ends through two connecting rods. A pressure sensor is provided between the upper Z-axis sliding key and the top support plate.

[0012] Furthermore, the pressure sensor is a capacitive integrated miniature pressure sensor, composed of an array of capacitive sensitive elements.

[0013] Beneficial effects: Compared with the prior art, the significant advantages of this invention are: by detecting pulse by detecting forces in multiple directions, the detection results are more accurate; multiple orthogonally distributed flexible amplification mechanisms can amplify the stress in the Z-axis direction of the detection point, and at the same time, the detection data can be compared to enhance the accuracy of the measurement; in addition, the overall device achieves an integrated structure through hydrogel bonding, which has excellent tensile properties and compressive toughness, and exhibits a sensitive response to external strain. It can monitor changes in human movement in real time and accurately through the output of electrical signals. Attached Figure Description

[0014] Figure 1 This is an overall side view of the invention; Figure 2 This is a schematic diagram of the X-axis metal foil strain gauge, the Y-axis metal foil strain gauge, and the Z-axis flexible amplification mechanism of the present invention. Figure 3 This is a schematic diagram of the planar structure of the X-axis metal foil strain gauge of the present invention; Figure 4 This is a schematic diagram of the Z-axis flexible amplification mechanism of the present invention. Detailed Implementation

[0015] The following detailed explanation, with reference to specific examples and accompanying diagrams, is provided in conjunction with the manual.

[0016] like Figure 1-4The multilayer flexible pulse sensor shown includes an X-axis metal foil strain gauge 1, a Y-axis metal foil strain gauge 2, a Z-axis flexible amplification mechanism 3, an airbag assembly 4, and a pressure sensor 5 located at the contact surface between the Z-axis flexible amplification mechanism 3 and the airbag assembly 4, arranged layer by layer from bottom to top.

[0017] An insulating substrate 6 is provided at the bottom of the X-axis foil strain gauge 1, between the X-axis foil strain gauge 1 and the Y-axis foil strain gauge 2, and at the top of the Y-axis foil strain gauge 2, thus forming a three-layer detection structure. The X-axis foil strain gauge 1, the Y-axis foil strain gauge 2, the Z-axis flexible amplification mechanism 3, and the insulating substrate 6 are all integrated into a single structure using hydrogel. This insulating substrate structure not only provides reliable mechanical support for each functional layer, but also serves as a medium for strain transmission, efficiently and losslessly transferring the mechanical strain of the skin surface to the upper functional layers. Furthermore, its flexibility and extensibility ensure that the sensor can closely conform to the curve of the human wrist, adapting to surface deformation during dynamic measurement.

[0018] X-axis foil strain gauge 1 and Y-axis foil strain gauge 2 are orthogonally arranged in space to detect the stress in the X-axis and Y-axis directions, respectively.

[0019] like Figure 4 As shown, both the X-axis foil strain gauge 1 and the Y-axis foil strain gauge 2 are composed of two interconnected fan-shaped strain gauges. This symmetrical fan-shaped structure increases the contact area with the measured object, improves heat dissipation, effectively suppresses the influence of lateral effects, and achieves lateral force comparison through the symmetrical distribution of the double fan-shaped structure, thereby synergistically improving the measurement accuracy in both directions.

[0020] Four Z-axis flexible amplification mechanisms 3 are arranged on the same layer and orthogonally distributed. Each Z-axis flexible amplification mechanism 3 is equipped with a pressure sensor 5. The pressure sensor 5 is a capacitive integrated micro pressure sensor, which is composed of an array of capacitive sensitive elements and mainly measures the force in the Z-axis direction.

[0021] like Figure 3As shown, the Z-axis flexible amplification mechanism 3 includes a bottom support plate 301 and a top support plate 302. Lateral transmission linkage mechanisms are provided on both sides between the bottom support plate 301 and the top support plate 302. Each lateral transmission linkage mechanism includes a fixing key 303 fixed to the bottom support plate 301 and the top support plate 302. Each fixing key 303 is connected to two side sliding keys 304 on both sides via two connecting rods. The two inner side sliding keys 304 are connected to the upper and lower Z-axis sliding keys 305 via two connecting rods. A pressure sensor 5 is provided between the upper Z-axis sliding key 305 and the top support plate 302. During operation, the bottom support plate 301 is pressed upwards, causing the side sliding keys 304 to move horizontally. The horizontal movement of the side sliding keys 304 causes the Z-axis sliding keys 305 to move up and down. This, through the flexible amplification mechanism 3, counteracts the forces on the lower X and Y axes and amplifies the force on the Z-axis. The pressure sensor 5 detects the force.

[0022] The X-axis foil strain gauge 1, the Y-axis foil strain gauge 2, and the pressure sensor 5 are all connected to the central drive chip via external circuitry. The central drive chip processes the signals, converts them into digital signals, and then sends them to the external terminal device. The central drive chip compares and verifies the detection data of the four orthogonal pressure sensors 5, which can enhance the accuracy of the measurement.

Claims

1. A multilayer flexible pulse sensor, characterized in that: It includes an X-axis metal foil strain gauge (1), a Y-axis metal foil strain gauge (2), a Z-axis flexible amplification mechanism (3), an airbag assembly (4), and a pressure sensor (5) located at the contact surface between the Z-axis flexible amplification mechanism (3) and the airbag assembly (4), arranged layer by layer from bottom to top. The X-axis foil strain gauge (1), Y-axis foil strain gauge (2) and pressure sensor (5) are all connected to the central drive chip through an external circuit. The central drive chip processes the signal, converts it into a digital signal, and then sends it to the external terminal device.

2. The multilayer flexible pulse sensor according to claim 1, characterized in that: An insulating substrate (6) is provided at the bottom of the X-axis metal foil strain gauge (1), between the X-axis metal foil strain gauge (1) and the Y-axis metal foil strain gauge (2), and at the top of the Y-axis metal foil strain gauge (2).

3. The multilayer flexible pulse sensor according to claim 1, characterized in that: The X-axis metal foil strain gauge (1), Y-axis metal foil strain gauge (2), Z-axis flexible amplification mechanism (3), and insulating substrate (6) are all integrated into a single structure using hydrogel.

4. The multilayer flexible pulse sensor according to claim 1, characterized in that: The X-axis foil strain gauge (1) and the Y-axis foil strain gauge (2) are orthogonally arranged in space to detect the stress in the X-axis and Y-axis directions, respectively.

5. The multilayer flexible pulse sensor according to claim 1, characterized in that: The X-axis foil strain gauge (1) and the Y-axis foil strain gauge (2) are both composed of two interconnected fan-shaped strain gauges.

6. The multilayer flexible pulse sensor according to claim 1, characterized in that: The Z-axis flexible amplification mechanism (3) has four units arranged on the same layer and is orthogonally distributed. Each Z-axis flexible amplification mechanism (3) is equipped with a pressure sensor (5) and is connected to the central drive chip.

7. The multilayer flexible pulse sensor according to claim 1, characterized in that: The Z-axis flexible amplification mechanism (3) includes a bottom support plate (301) and a top support plate (302). Lateral transmission linkage mechanisms are provided on both sides between the bottom support plate (301) and the top support plate (302). The lateral transmission linkage mechanism includes a fixing key (303) fixed to the bottom support plate (301) and the top support plate (302). Each fixing key (303) is connected to the side sliding keys (304) on both sides through two connecting rods. The two side sliding keys (304) located on the inner side are connected to the Z-axis sliding keys (305) at the upper and lower ends through two connecting rods. A pressure sensor (5) is provided between the Z-axis sliding key (305) at the upper end and the top support plate (302).

8. The multilayer flexible pulse sensor according to claim 1, characterized in that: The pressure sensor (5) is a capacitive integrated micro pressure sensor, which is composed of an array of capacitive sensitive elements.

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