CN-121971056-A - Wearable optional-position arterial pressure wave monitoring patch

CN121971056ACN 121971056 ACN121971056 ACN 121971056ACN-121971056-A

Abstract

The invention provides a wearable random-position arterial pressure wave monitoring patch which comprises a double-layer multi-intersection conductive micro-channel, wherein a soft elastomer wraps an upper layer of conductive liquid and a lower layer of conductive liquid to form a conductive intersection micro-channel structure to form a conductive path. The soft elastomer is deformed under the action of pressure, the cross section of the crossed conductive liquid cavity channel is reduced in double, and the resistance is increased. The hemispherical microprotrusion array is arranged right above each intersection of the microcavity channels, so that the pressure can be concentrated in the intersection area, and the sensitivity of the sensor to the pressure is greatly improved. The pressure applied by the sensor can be obtained by monitoring the resistance change at the two ends of the conductive cavity. The invention realizes the measurement of extremely weak pressure by utilizing the serial structure of multiple cross points, has the advantages of insensitivity to the pressure action position and the like, can realize the continuous monitoring of high-quality arterial pressure waves at any position of wrists and fingers, and has good application prospect in the field of wearable medical health detection.

Inventors

WANG HONGBO
GAO YINGJIE
LI QIAN
CHANG XINXIN
Peng Yulian

Assignees

中国科学技术大学

Dates

Publication Date: 20260505
Application Date: 20260205

Claims (10)

1. A wearable arbitrary position arterial pressure wave monitoring patch, comprising: The soft elastic body is internally provided with double-layer conductive micro-channels, each layer of conductive micro-channel comprises a plurality of branches extending in a reciprocating manner, the branches of the two layers of conductive micro-channels are mutually intersected to form a plurality of intersecting points, and the soft elastic body deforms when being pressed; the conductive liquid is completely filled in the double-layer conductive micro-channel to form a conductive path, and the cross section area of the conductive liquid is reduced along with the deformation of the soft elastomer, so that the resistance of the conductive path is increased; the hemispherical microprotrusion array is connected with the soft elastomer, and each hemispherical microprotrusion is correspondingly arranged right above one intersection point and is used for concentrating pressure in the intersection point area; the two ends of the double-layer conductive micro-channel are provided with electric connection terminals for measuring the resistance change of the conductive path, and the pressure detection is realized through the series resistance change of the multiple cross points, so that the sensor is insensitive to the pressure action position.
2. The wearable arbitrary position arterial pressure wave monitoring patch of claim 1, wherein the conductive liquid is a liquid metal conductor or an ion conductive solution.
3. The wearable arbitrary position arterial pressure wave monitoring patch of claim 2, wherein the liquid metal conductor is gallium indium alloy or gallium indium tin alloy.
4. The wearable arbitrary position arterial pressure wave monitoring patch of claim 1, wherein the double-layer conductive micro-channel has a serpentine structure and the two layers are arranged orthogonally to each other to form a high-density cross-point network.
5. The wearable arbitrary position arterial pressure wave monitoring patch of claim 4, wherein the upper and lower layers of the double-layer serpentine conductive microchannel are connected in series to form a single conductive path.
6. The wearable arbitrary position arterial pressure wave monitoring patch of claim 4, wherein the crossover point network resistance changes into a series configuration, each crossover point resistance change acting independently on the conductive path resistance change.
7. The wearable arbitrary position arterial pressure wave monitoring patch of claim 1, wherein the hemispherical microprotrusion array is cross-linked with the soft elastomer substrate to form an integral structure.
8. The wearable arbitrary position arterial pressure wave monitoring patch of claim 1, wherein the soft elastomer completely seals and encapsulates the conductive fluid, isolating the conductive fluid from the outside.
9. The wearable arbitrary position arterial pressure wave monitoring patch of claim 1, wherein the patch is bendable and stretch deformable.
10. The wearable optional-position arterial pressure wave monitoring patch of claim 1, wherein the patch is attachable to a skin surface of a human wrist, finger or neck for continuous arterial pressure wave monitoring.

Description

Wearable optional-position arterial pressure wave monitoring patch Technical Field The invention relates to the field of resistive pressure sensors, in particular to a wearable arterial pressure wave monitoring patch at any position. Background Along with the rapid development of wearable health monitoring technology, the demand for high-sensitivity and high-flexibility pressure sensors is urgent, especially in the aspect of noninvasively and continuously monitoring weak physiological signals such as arterial pulsation of human body. The existing flexible pressure sensor mostly adopts a solid-state piezoresistive or capacitive structure, for example, conductive particles are doped in an elastic matrix, or pressure is sensed by utilizing the change of contact area of two layers of conductive fabrics under pressure. Although the scheme has certain flexibility, the problems of insufficient sensitivity, response lag, poor mechanical stability and the like generally exist, and high-frequency and micro-amplitude dynamic signals such as pulse waves and the like are difficult to effectively capture. Another type of sensor based on textile structures, such as an array of intersecting conductive yarns, can achieve distributed pressure sensing, but its sensing mechanism relies on local contact resistance changes at discrete intersections, overall compliance is limited by yarn stiffness, and is not sensitive enough to respond to weak, concentrated point pressures (e.g., radial artery pulsations). In addition, such sensors often require complex braiding or embroidery processes, which makes it difficult to ensure consistency in mass production. In recent years, liquid metals have become an emerging material in the flexible electronics field due to their excellent conductivity, flowability and stretchability. However, how to stably encapsulate it in a microstructure and to construct a continuous conductive path highly sensitive to minute pressure disturbances remains a technical difficulty. Particularly in the application scene facing the attachment of human epidermis, the sensor not only needs to have ultrathin, soft and stretchable physical characteristics, but also needs to have robustness on the attachment position deviation so as to ensure that high-quality physiological signals can be stably obtained under the non-ideal wearing condition. Therefore, a novel flexible pressure sensing structure is needed, the limitation of the traditional solid state sensing mechanism can be broken through, and the high-sensitivity and high-fidelity detection of weak pressure is realized through the synergistic effect of the fluid characteristics of the liquid conductor and the microstructure design, and meanwhile, the wearing comfort and the use convenience are both considered. Disclosure of Invention In order to solve the technical problems, the invention provides a wearable arterial pressure wave monitoring patch at any position, which comprises a double-layer multi-cross-point conductive micro-channel, wherein a soft elastomer wraps an upper layer of conductive liquid and a lower layer of conductive liquid to form a conductive cross-point micro-channel structure, so as to form a conductive path. The soft elastomer is deformed under the action of pressure, the cross section of the upper layer and the lower layer of crossed conductive liquid cavity channel is reduced doubly, and the resistance is increased. The hemispherical microprotrusion array is arranged right above each intersection of the microcavity channels, so that the pressure can be concentrated in the intersection area, and the sensitivity of the sensor to the pressure is greatly improved. The pressure applied by the sensor can be obtained by monitoring the resistance change at the two ends of the conductive cavity. The invention realizes the measurement of extremely weak pressure by utilizing the serial structure of multiple cross points, has the advantages of insensitivity to the pressure action position and the like, can realize the continuous monitoring of high-quality arterial pressure waves at any position of wrists and fingers, and has good application prospect in the field of wearable medical health detection. In order to achieve the above purpose, the invention adopts the following technical scheme: A wearable arbitrary position arterial pressure wave monitoring patch, comprising: The soft elastic body is internally provided with double-layer conductive micro-channels, each layer of conductive micro-channel comprises a plurality of branches extending in a reciprocating manner, the branches of the two layers of conductive micro-channels are mutually intersected to form a plurality of intersecting points, and the soft elastic body deforms when being pressed; the conductive liquid is completely filled in the double-layer conductive micro-channel to form a conductive path, and the cross section area of the conductive liquid is reduced along with the deformation of t