Coupling agent self-supplementing method and device and wearable ultrasonic patch
By employing a coupling agent replenishment method based on sensor signal perception and closed-loop control, the problem of coupling agent drying in wearable ultrasonic patches has been solved, enabling long-term unattended continuous monitoring and ensuring the continuity and reliability of monitoring.
Patent Information
- Application Number
- CN202511646728.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-11
- Publication Date
- 2026-03-03
AI Technical Summary
Existing wearable ultrasound patches suffer from acoustic impedance mismatch due to moisture evaporation or loss of the coupling agent during prolonged wear, leading to ultrasound signal attenuation and affecting monitoring performance. Current solutions cannot achieve continuous and effective coupling agent replenishment.
The coupling state is sensed by sensor signals, the coupling quality index is calculated and trigger commands are generated, and actuators such as piezoelectric film micropumps are used to achieve precise replenishment of the coupling agent, forming a closed-loop control system to ensure the continuous effectiveness of the acoustic interface.
It enables continuous monitoring without human intervention for extended periods, reducing the burden on medical staff, ensuring the continuity and reliability of monitoring data, and avoiding resource waste and skin problems.
Smart Images
Figure CN121587764A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical sensing technology, specifically to a method, device, and wearable ultrasound patch for self-replenishing of coupling agent. Background Technology
[0002] Wearable ultrasound patches offer a revolutionary means for long-term continuous monitoring of diseases such as those affecting the lungs and cardiovascular system. However, a long-standing technical bottleneck lies in the fact that an ultrasound coupling agent must be filled between the patch and the skin to ensure effective ultrasound transmission. During continuous wear for hours or even days, the moisture in the coupling agent gradually evaporates, is absorbed by the skin, or is squeezed out, leading to the coupling agent drying out, acoustic impedance mismatch, severe attenuation of the ultrasound signal, a sharp decline in image quality, and ultimately, monitoring interruption or data failure.
[0003] To address the aforementioned problems, existing technologies primarily employ passive moisturizing and artificial intervention. While these methods can achieve some effect, they still have significant shortcomings: (a) Passive moisturizing: Using thick hydrogels or better sealing materials can only delay but not prevent the eventual loss of moisture, and will affect the skin's breathability, increasing discomfort and the risk of dermatitis.
[0004] (ii) Manual intervention: Medical staff need to periodically remove the patch and reapply the coupling agent, which seriously disrupts the continuity of monitoring, increases the workload and infection risk, and makes true "unattended" long-term monitoring impossible.
[0005] (iii) Static design: Existing technology treats coupling agent as a static consumable for single use, without considering the possibility of dynamic replenishment during its consumption. Summary of the Invention
[0006] This application provides a method, device, and wearable ultrasonic patch for self-replenishing of coupling agent, which can sense the coupling status in real time and actively and accurately replenish the coupling medium.
[0007] In a first aspect, embodiments of this application provide a coupling agent self-replenishment method, the coupling agent self-replenishment method comprising: Acquire sensing signals characterizing the acoustic coupling quality between the wearable ultrasonic patch and the skin; Based on the sensing signal, calculate the current coupling quality index and compare the current coupling quality index with a preset action threshold; When the current coupling quality index is lower than the action threshold, a trigger command is generated and output. In response to the trigger command, a coupling agent is delivered to the acoustic interface between the wearable ultrasound patch and the skin.
[0008] In conjunction with the first aspect, in one embodiment, acquiring the sensing signal characterizing the acoustic coupling quality between the wearable ultrasonic patch and the skin includes: Based on the bioimpedance monitoring unit, the contact impedance between the wearable ultrasonic patch and the skin is obtained.
[0009] In conjunction with the first aspect, in one embodiment, acquiring the sensing signal characterizing the acoustic coupling quality between the wearable ultrasonic patch and the skin includes: The waveform curve of the received echo signal is obtained based on the ultrasonic echo monitoring unit.
[0010] In conjunction with the first aspect, in one implementation, calculating the current coupling quality index based on the sensing signal includes: The root mean square value of the echo signal within a set time window is used as the baseline intensity Ib; The current coupling quality index CQ is calculated using the formula: CQ = Ib / Ib0, where Ib0 is the baseline strength reference value measured at the initial stage of attachment.
[0011] In conjunction with the first aspect, in one implementation, it further includes: After delivering the coupling agent, the current coupling quality index is measured again; If the current coupling quality index has not recovered to the set threshold, the coupling agent will be delivered again after a set interval until the set threshold is reached or the number of replenishments is increased.
[0012] In conjunction with the first aspect, in one implementation, it further includes: The current coupling quality index is compared with a preset warning threshold; If the current coupling quality index is lower than the warning threshold but higher than the action threshold, then enter the preparation state or reduce the replenishment frequency.
[0013] Secondly, embodiments of this application provide a coupling agent self-replenishing device, the coupling agent self-replenishing device comprising: The sensing module is used to acquire sensing signals that characterize the acoustic coupling quality between the wearable ultrasonic patch and the skin. The decision module calculates the current coupling quality index based on the sensor signal, compares the current coupling quality index with a preset action threshold, and generates and outputs a trigger command when the current coupling quality index is lower than the action threshold. An execution module, which, in response to the trigger command, delivers coupling agent to the acoustic interface between the wearable ultrasound patch and the skin.
[0014] Thirdly, embodiments of this application provide a wearable ultrasonic patch, the wearable ultrasonic patch comprising: Patch body; A liquid reservoir is disposed within the patch body, and the liquid reservoir stores coupling agent; An actuator, disposed on the patch body, is used to deliver coupling agent within the reservoir cavity; A flow channel is provided on the patch body and communicates with the liquid storage chamber; The sensing module is used to acquire sensing signals; A controller includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following operations when the computer program is executed by the processor: The sensing module acquires sensing signals characterizing the acoustic coupling quality. The current coupling quality index is calculated based on the sensor signal, and a trigger command is generated when it is lower than a preset action threshold. The actuator is controlled to respond to the trigger command and deliver the coupling agent in the reservoir to the acoustic interface through the flow channel.
[0015] In conjunction with the third aspect, in one embodiment, the sensing module is an RMS detection circuit used to calculate the baseline strength of the echo signal.
[0016] In conjunction with the third aspect, in one embodiment, the actuator is a piezoelectric thin-film micropump.
[0017] The beneficial effects of the technical solutions provided in this application include: The coupling agent self-replenishment method in this application acquires a sensing signal characterizing the acoustic coupling quality between the wearable ultrasound patch and the skin; calculates the current coupling quality index based on the sensing signal and compares the current coupling quality index with a preset action threshold; when the current coupling quality index is lower than the action threshold, generates and outputs a trigger command; in response to the trigger command, delivers coupling agent to the acoustic interface between the wearable ultrasound patch and the skin.
[0018] This application effectively solves the signal attenuation problem caused by the drying of coupling agent in wearable ultrasound patches through closed-loop control, enabling long-term unattended continuous monitoring; its intelligent closed-loop control (integrating perception-decision-execution-feedback) enables on-demand and precise coupling agent replenishment, avoiding resource waste and skin problems caused by excessive moisture; it significantly reduces the burden on medical staff and ensures the continuity and clinical reliability of monitoring data. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a flowchart of an embodiment of the coupling agent self-replenishment method of this application; Figure 2 This is a detailed flowchart of step S2 in this application; Figure 3 This is the closed-loop control schematic diagram of this application; Figure 4 This is a structural block diagram of an embodiment of the coupling agent self-replenishing device of this application; Figure 5 This is a structural block diagram of the wearable ultrasound patch of this application. Detailed Implementation
[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.
[0022] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.
[0023] In a first aspect, embodiments of this application provide a method for self-replenishing coupling agent.
[0024] In one embodiment, reference is made to Figure 1 , Figure 1 This is a flowchart of an embodiment of the coupling agent self-replenishment method of this application. Figure 1 As shown, the coupling agent self-replenishment method includes: S1. Acquire sensor signals that characterize the acoustic coupling quality between the wearable ultrasonic patch and the skin; In this embodiment, an ultrasonic echo monitoring unit can be used to acquire the waveform curve of the received echo signal, mainly for obtaining the baseline intensity or signal-to-noise ratio of the echo signal. When coupling deteriorates, the effective acoustic energy penetrating the skin decreases, resulting in an overall decrease in the baseline intensity of the echo signal at all depths. This can be used to judge the acoustic coupling quality. In specific implementation, an existing ultrasonic front-end chip can be used, with a low-power RMS detection circuit added to its receiving channel for real-time calculation of the echo signal baseline intensity.
[0025] In addition, a bioimpedance monitoring unit can be used to measure the contact impedance between the patch and the skin. The contact impedance increases significantly as the coupling agent dries, thus the acoustic coupling quality can also be characterized by the contact impedance.
[0026] S2. Based on the sensing signal, calculate the current coupling quality index and compare the current coupling quality index with a preset action threshold; Taking the aforementioned ultrasonic echo monitoring unit as an example, see... Figure 2 As shown, step S2 specifically includes: S21. The root mean square value of the echo signal within a set time window is used as the baseline intensity Ib. Specifically, the root mean square value of the echo signal within a specific time window (corresponding to a depth of 1-3 mm below the skin surface) can be calculated as the baseline intensity.
[0027] S22. Calculate the current coupling quality index CQ according to the formula: CQ = Ib / Ib0, where Ib0 is the baseline strength reference value measured at the initial stage of attachment.
[0028] S3. When the current coupling quality index is lower than the action threshold, generate and output a trigger command; S4. In response to the trigger command, a coupling agent is delivered to the acoustic interface between the wearable ultrasound patch and the skin.
[0029] Preferably, after delivering the coupling agent, the current coupling quality index is measured again; if the current coupling quality index still has not recovered to the set threshold, the coupling agent is delivered again after a set interval, until the set threshold is reached or the number of replenishments is increased.
[0030] Furthermore, the current coupling quality index can be compared with a preset warning threshold; if the current coupling quality index is lower than the warning threshold but higher than the action threshold, then the system enters a preparation state or reduces the replenishment frequency.
[0031] In this embodiment, a threshold comparator can be used to compare the coupling quality index with a preset first threshold (early warning threshold) and a second threshold (action threshold). When the index is below the action threshold, the microcontroller generates a trigger command; when the index is below the early warning threshold but above the action threshold, it can enter a preparation state or reduce the replenishment frequency. Specifically, the following control logic can be used: (1) Warning threshold CQ_warn = 0.7: The system records the event but does not take any action.
[0032] (2) Action threshold CQ_act = 0.5: Immediately trigger supplementary procedures.
[0033] (3) Supplementation procedure: Each time it is triggered, drive the piezoelectric pump to work for 3 pulses (releasing about 1μL of liquid), then wait 20 seconds to allow the liquid to diffuse, and measure CQ again. If CQ still does not recover to above 0.8, perform the next supplementation after 1 minute. The maximum number of consecutive attempts is 3.
[0034] To achieve the above process, in this embodiment, the liquid storage chamber used for supply is a flexible, compressible, sealed cavity pre-filled with a long-lasting moisturizing hydrogel or liquid coupling agent. The cavity wall can be made of a biomimetic porous material (such as a porous polymer film) to allow for trace amounts of seepage, achieving basic moisturization.
[0035] Then, the actuator receives the trigger command from the microcontroller and generates one or more actions to deliver the coupling agent in the reservoir towards the skin interface. Specifically, a micro pump or electroosmotic pump can be used to achieve this.
[0036] Among these, micropumps, such as piezoelectric thin-film micropumps, thermal bubble micropumps, or shape memory alloy-driven micropumps, provide pulsed liquid flow. Piezoelectric thin-film micropumps are preferred, as a single pulse can output a droplet of approximately 0.1-0.5 μL, offering advantages such as low power consumption, fast response, and small size. Electroosmotic pumps utilize an electric field to drive a charged coupling agent through microchannels, achieving precise delivery without moving parts.
[0037] This embodiment also incorporates a microchannel network to connect the reservoir, micro-actuators, and outlets distributed around the ultrasonic transducer array, ensuring uniform diffusion of the coupling agent throughout the acoustic interface. In this embodiment, laser engraving technology is used to fabricate micron-level channels on the flexible substrate of the patch, with the outlets arranged in a ring around the ultrasonic transducer array to ensure uniform wetting.
[0038] In addition, an energy module is included to power the entire active moisturizing system. Specifically, this embodiment employs an ultra-low-power microcontroller that remains in sleep mode 99% of the time, only waking periodically for measurements. It is powered by a rechargeable miniature lithium polymer battery.
[0039] In this embodiment, coupling quality is checked every 5 minutes, with each check and calculation consuming approximately 0.1 mJ. A complete supplementary procedure (including 3 pump actions and measurements) consumes approximately 2 mJ. In typical scenarios, the additional power consumption generated by the moisturizing function per day is less than 50 mJ, which has a negligible impact on overall battery life.
[0040] In a phantom experiment with 48 hours of continuous monitoring, the system of this invention was compared with a conventional thick-layer hydrogel patch. After 12 hours, the echo signal of the conventional patch attenuated by more than 60%, rendering the image unrecognizable. However, using the patch of this application, the echo signal intensity remained above 85% of its initial value throughout the entire 48 hours. During this period, the system automatically triggered a total of 8 replenishments, with a total coupling agent consumption of approximately 8 μL, accounting for only 0.8% of the total reservoir volume. This demonstrates the high efficiency and effectiveness of this application in maintaining long-term stable coupling.
[0041] See Figure 3 As shown, the closed-loop control principle of this application will be further explained: (a) System initialization: setting the basic threshold for coupling quality.
[0042] (ii) During the interval or low power mode of ultrasonic monitoring, the coupling status sensing module is periodically activated to measure the current echo baseline intensity or contact impedance.
[0043] (iii) Calculate the current coupling quality index and compare it with the threshold.
[0044] (iv) If the indicator is lower than the action threshold, the microcontroller sends a pulse trigger signal to the micro actuator.
[0045] (v) The micro-actuator operates to pump nanoliter or microliter level coupling agent from the reservoir and deliver it to the skin interface through the microchannel.
[0046] (vi) After the system waits for a short diffusion equilibrium time (e.g., 10-30 seconds), the coupling quality index is measured again to evaluate the supplementation effect.
[0047] (vii) If the indicator recovers to above the safety threshold, the replenishment is complete; if it does not recover, the next replenishment can be triggered after a delay until it is successful or the maximum number of attempts is reached (to prevent infinite attempts in abnormal situations such as patch detachment).
[0048] (viii) The system records supplementary events and resource consumption, and returns the monitoring status.
[0049] Based on the above steps, it can be understood that the intelligent closed-loop control of this application integrates "perception-decision-execution-feedback," achieving on-demand and precise replenishment, avoiding resource waste and skin problems caused by excessive moisture, and demonstrating a high degree of intelligence. By actively maintaining the optimal acoustic interface, it solves the core bottleneck restricting the development of wearable ultrasound—coupled agent drying—making unattended monitoring for more than 24 / 7 possible. This eliminates the need for frequent intervention by medical personnel, reduces their workload, ensures the continuity and reliability of monitoring data, and provides stable technical support for precision medicine. Furthermore, mimicking the secretion mechanism of skin glands, it employs microfluidic technology and biomimetic porous materials, resulting in a compact system structure and reliable operation, making it highly suitable for integration into the limited space of flexible patches.
[0050] In summary, the coupling agent self-replenishment method in this application acquires a sensing signal characterizing the acoustic coupling quality between the wearable ultrasound patch and the skin; calculates the current coupling quality index based on the sensing signal and compares the current coupling quality index with a preset action threshold; when the current coupling quality index is lower than the action threshold, a trigger command is generated and output; in response to the trigger command, coupling agent is delivered to the acoustic interface between the wearable ultrasound patch and the skin.
[0051] This application effectively solves the signal attenuation problem caused by the drying of coupling agent in wearable ultrasound patches through closed-loop control, enabling long-term unattended continuous monitoring; its intelligent closed-loop control (integrating perception-decision-execution-feedback) enables on-demand and precise coupling agent replenishment, avoiding resource waste and skin problems caused by excessive moisture; it significantly reduces the burden on medical staff and ensures the continuity and clinical reliability of monitoring data.
[0052] Secondly, embodiments of this application provide a coupling agent self-replenishment device.
[0053] In one embodiment, reference is made to Figure 4 , Figure 4 This is a flowchart of an embodiment of the coupling agent self-replenishing device of this application. Figure 4 As shown, the coupling agent self-replenishment device includes: a sensing module, a decision-making module, and an execution module.
[0054] The sensing module is used to acquire sensing signals that characterize the acoustic coupling quality between the wearable ultrasonic patch and the skin. The decision module calculates the current coupling quality index based on the sensor signal, compares the current coupling quality index with a preset action threshold, and generates and outputs a trigger command when the current coupling quality index is lower than the action threshold. An execution module, which, in response to the trigger command, delivers coupling agent to the acoustic interface between the wearable ultrasound patch and the skin.
[0055] Further, in one embodiment, the sensing module acquires sensing signals characterizing the acoustic coupling quality between the wearable ultrasonic patch and the skin, including: Based on the bioimpedance monitoring unit, the contact impedance between the wearable ultrasonic patch and the skin is obtained.
[0056] Furthermore, in one embodiment, the sensing module acquires sensing signals characterizing the acoustic coupling quality between the wearable ultrasonic patch and the skin, including: The waveform curve of the received echo signal is obtained based on the ultrasonic echo monitoring unit.
[0057] Furthermore, in one embodiment, the decision module calculates the current coupling quality index based on the sensing signal, including: The root mean square value of the echo signal within a set time window is used as the baseline intensity Ib; The current coupling quality index CQ is calculated using the formula: CQ = Ib / Ib0, where Ib0 is the baseline strength reference value measured at the initial stage of attachment.
[0058] Furthermore, in one embodiment, the decision module is also used to: measure the current coupling quality index again after delivering the coupling agent; The execution module is also used to: if the current coupling quality index has not recovered to the set threshold, deliver the coupling agent again after a set time interval until the set threshold is reached or the number of replenishments is increased.
[0059] Furthermore, in one embodiment, the decision module is also used for: The current coupling quality index is compared with a preset warning threshold; If the current coupling quality index is lower than the warning threshold but higher than the action threshold, then enter the preparation state or reduce the replenishment frequency.
[0060] The functions of each module in the above-mentioned self-replenishing coupling agent device correspond to the steps in the above-mentioned self-replenishing coupling agent method embodiment, and their functions and implementation processes will not be described in detail here.
[0061] Thirdly, embodiments of this application provide a wearable ultrasonic patch.
[0062] In one embodiment, the wearable ultrasound patch includes: Patch body; A liquid reservoir is disposed within the patch body, and the liquid reservoir stores coupling agent; An actuator, disposed on the patch body, is used to deliver coupling agent within the reservoir cavity; A flow channel is provided on the patch body and communicates with the liquid storage chamber; The sensing module is used to acquire sensing signals; A controller includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following operations when the computer program is executed by the processor: The sensing module acquires sensing signals characterizing the acoustic coupling quality. The current coupling quality index is calculated based on the sensor signal, and a trigger command is generated when it is lower than a preset action threshold. The actuator is controlled to respond to the trigger command and deliver the coupling agent in the reservoir to the acoustic interface through the flow channel.
[0063] See Figure 5 The diagram shows the layered structure of a wearable ultrasonic patch, which mainly includes an upper encapsulation layer, a functional device layer, a microfluidic channel layer, and a lower encapsulation / interface layer. The functional device layer includes an ultrasonic transducer array, flexible circuitry and a microcontroller unit (MCU), a flexible liquid reservoir, and an actuator; the microfluidic channel layer includes microchannels and a liquid outlet.
[0064] Furthermore, in one embodiment, the sensing module is an RMS detection circuit used to calculate the baseline strength of the echo signal.
[0065] Furthermore, in one embodiment, the actuator is a piezoelectric thin-film micropump.
[0066] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0067] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0068] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A method for self-replenishing coupling agent, characterized in that, The coupling agent self-replenishment method includes: Acquire sensing signals characterizing the acoustic coupling quality between the wearable ultrasonic patch and the skin; Based on the sensing signal, calculate the current coupling quality index and compare the current coupling quality index with a preset action threshold; When the current coupling quality index is lower than the action threshold, a trigger command is generated and output. In response to the trigger command, a coupling agent is delivered to the acoustic interface between the wearable ultrasound patch and the skin.
2. The coupling agent self-replenishment method as described in claim 1, characterized in that, The acquisition of sensing signals characterizing the acoustic coupling quality between the wearable ultrasonic patch and the skin includes: Based on the bioimpedance monitoring unit, the contact impedance between the wearable ultrasonic patch and the skin is obtained.
3. The coupling agent self-replenishment method as described in claim 1, characterized in that, The acquisition of sensing signals characterizing the acoustic coupling quality between the wearable ultrasonic patch and the skin includes: The waveform curve of the received echo signal is obtained based on the ultrasonic echo monitoring unit.
4. The coupling agent self-replenishment method as described in claim 2, characterized in that, The calculation of the current coupling quality index based on the sensing signal includes: The root mean square value of the echo signal within a set time window is used as the baseline intensity Ib; The current coupling quality index CQ is calculated using the formula: CQ = Ib / Ib0, where Ib0 is the baseline strength reference value measured at the initial stage of attachment.
5. The coupling agent self-replenishment method as described in claim 1, characterized in that, Also includes: After delivering the coupling agent, the current coupling quality index is measured again; If the current coupling quality index has not recovered to the set threshold, the coupling agent will be delivered again after a set interval until the set threshold is reached or the number of replenishments is increased.
6. The coupling agent self-replenishment method as described in claim 1 or 5, characterized in that, Also includes: The current coupling quality index is compared with a preset warning threshold; If the current coupling quality index is lower than the warning threshold but higher than the action threshold, then enter the preparation state or reduce the replenishment frequency.
7. A self-replenishing coupling agent device, characterized in that, The coupling agent self-replenishment device includes: The sensing module is used to acquire sensing signals that characterize the acoustic coupling quality between the wearable ultrasonic patch and the skin. The decision module calculates the current coupling quality index based on the sensor signal, compares the current coupling quality index with a preset action threshold, and generates and outputs a trigger command when the current coupling quality index is lower than the action threshold. An execution module, which, in response to the trigger command, delivers coupling agent to the acoustic interface between the wearable ultrasound patch and the skin.
8. A wearable ultrasonic patch, characterized in that, The wearable ultrasound patch includes: Patch body; A liquid reservoir is disposed within the patch body, and the liquid reservoir stores coupling agent; An actuator, disposed on the patch body, is used to deliver coupling agent within the reservoir cavity; A flow channel is provided on the patch body and communicates with the liquid storage chamber; The sensing module is used to acquire sensing signals; A controller includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following operations when the computer program is executed by the processor: The sensing module acquires sensing signals characterizing the acoustic coupling quality. The current coupling quality index is calculated based on the sensor signal, and a trigger command is generated when it is lower than a preset action threshold. The actuator is controlled to respond to the trigger command and deliver the coupling agent in the reservoir to the acoustic interface through the flow channel.
9. The wearable ultrasonic patch as described in claim 8, characterized in that: The sensing module is an RMS detection circuit used to calculate the baseline strength of the echo signal.
10. The wearable ultrasonic patch as described in claim 8, characterized in that: The actuator is a piezoelectric thin-film micropump.