A wound dressing based on flexible electronics

Abstract

The present application relates to the field of medical wound care, and particularly relates to a wound dressing based on flexible electronic technology, comprising a dressing main body and an adaptive system; the adaptive system comprises: a flexible sensing module for real-time monitoring of multi-dimensional electrical signals at the wound site, and converting the multi-dimensional electrical signals into multi-dimensional digital signals; a feedback adjustment module for generating corresponding tension adjustment instructions based on the multi-dimensional digital signals and a preset tension threshold; a flexible braking module for applying an adaptive pulling force to the skin around the wound, so that the actual tension of the wound is maintained within the preset tension threshold; a communication module for wireless connection with an external terminal; and a power supply module for providing power to each module. The present application can realize real-time sensing and adaptive adjustment of wound tension, effectively buffer the skin stretching and tension impact caused by human activity, reduce the incidence of wound cracking, delayed healing and scar hyperplasia, and at the same time realize multi-parameter monitoring and remote intelligent nursing of the wound.

Description

Technical Field

[0001] This invention relates to the field of medical wound care, and specifically to a wound dressing based on flexible electronic technology. Background Technology

[0002] Traditional wound dressings, represented by conventional adhesive bandages, mainly consist of a backing, an absorbent layer, and an adhesive layer. Their core function is to cover the wound, absorb exudate, and physically isolate it from external bacteria to prevent infection. They are simple in structure, inexpensive, and widely used for temporary care of minor abrasions, cuts, and other superficial wounds. With the deep integration of electronic technology and the medical field, electronic dressings are gradually entering clinical applications, becoming a new direction in wound care. Currently available electronic dressings mainly include temperature-monitoring, humidity-monitoring, and exudate-detecting types. These dressings integrate micro-sensors, signal transmission modules, and other electronic components within the dressing to collect key parameters such as temperature, humidity, and exudate volume in the wound area in real time and transmit the data to terminal devices. This allows medical staff and patients to monitor wound healing in real time and adjust care plans accordingly, demonstrating significant advantages in the care of complex wounds such as chronic wounds and postoperative wounds.

[0003] However, existing electronic dressings still have some shortcomings and are difficult to meet the actual needs of clinical care. As a flexible tissue, human skin is stretched to a certain extent with daily activities (such as limb extension and joint bending). This stretching may directly increase the tension at the wound site, easily leading to wound dehiscence, delayed healing, and even scar hyperplasia. At the same time, the base material of existing electronic dressings has poor tensile properties (such as ordinary polyester film). When the skin is stretched, the dressing is stretched simultaneously, which in turn generates additional mechanical pressure on the wound. It is difficult to effectively buffer the tensile impact of skin stretching, thus making it difficult to maintain the low-tension healing environment required at the wound site and affecting the normal recovery of the wound.

[0004] Therefore, this invention proposes a wound dressing based on flexible electronic technology, which adapts to changes in tension at the wound site when the patient's skin is stretched. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a wound dressing based on flexible electronic technology, which monitors wound status in real time and adaptively adjusts wound tension, buffering skin stretching and tension impact caused by human activity, providing a stable low-tension healing environment for the wound, effectively reducing wound dehiscence, delayed healing, and scar hyperplasia, and achieving intelligent, closed-loop care for postoperative and chronic wounds.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a wound dressing based on flexible electronics technology, comprising a dressing body and an adaptive system, wherein the dressing body and the adaptive system are integrated in one piece using flexible electronics technology; the adaptive system comprises a flexible sensing module, a flexible braking module, a feedback adjustment module, a power supply module and a communication module;

[0007] The flexible sensing module is used to monitor multidimensional electrical signals at the wound site in real time, convert the multidimensional electrical signals into multidimensional digital signals, and output the multidimensional digital signals to the feedback adjustment module;

[0008] The feedback adjustment module is used to generate corresponding tension adjustment commands based on multi-dimensional digital signals and preset tension thresholds, and output the tension adjustment commands to the flexible braking module;

[0009] The flexible braking module is used to apply adaptive traction force to the skin around the wound according to the tension adjustment command, so that the actual tension of the wound is maintained within the preset tension threshold.

[0010] The communication module is used to transmit the operating parameters of the flexible sensing module, feedback adjustment module and flexible braking module to an external terminal in real time using wireless communication technology, so as to realize remote early warning and parameter control.

[0011] The power supply module provides power to the flexible sensing module, feedback regulation module, and communication module.

[0012] Furthermore, the monitoring dimensions of multidimensional electrical signals include wound tension, infection markers, and exudate volume.

[0013] Furthermore, the flexible sensing module includes an electrical unit and a digital unit;

[0014] The electrical unit is used to convert physical quantities such as wound tension, infection markers, and exudate volume into analog electrical signals;

[0015] The digital unit is used to preprocess and convert analog electrical signals into digital signals, forming multidimensional digital signals and outputting them to the feedback regulation module.

[0016] Furthermore, the electrical unit includes a tension-sensitive layer, a pH and lactic acid dual-sensitive conductive network layer, and an exudation-sensing layer, with a hydrophobic adhesive as the substrate.

[0017] Furthermore, the flexible braking module includes several modified elastomers, each with a two-way shape memory alloy spring wound around its surface, and the two-way shape memory alloy springs are pre-set with a stretch amount.

[0018] Furthermore, when the two-way shape memory alloy spring is energized, it undergoes a phase change and contraction under Joule heating, causing the modified elastomer to contract synchronously, thus regulating the tension of the wound. When the two-way shape memory alloy spring is de-energized, its temperature drops, and it recovers to its low-temperature phase state under the action of the two-way memory effect. At the same time, the elastic restoring force stored in the modified elastomer is released. Driven by the elastic restoring force and the two-way shape memory alloy effect, both the modified elastomer and the two-way shape memory alloy spring rebound and elongate along the stretching direction.

[0019] Furthermore, the feedback adjustment module is used to dynamically adjust the tension response threshold and the contraction force gradient of the two-way shape memory alloy spring.

[0020] Furthermore, the feedback adjustment module is also used to dynamically adjust the adaptation mode during the healing phase; the adaptation mode during the healing phase includes the adaptation mode during the inflammation phase, the adaptation mode during the proliferation phase, and the adaptation mode during the remodeling phase.

[0021] Furthermore, the feedback adjustment module includes a flexible micro control unit.

[0022] Furthermore, the power supply module includes flexible photovoltaic thin films and micro lithium batteries.

[0023] The technical principle of the above solution is as follows: This invention combines the dressing body with an adaptive system through flexible electronic integrated technology to achieve multi-parameter monitoring and adaptive tension control of the wound. Specifically, the flexible sensing module uses a hydrophobic adhesive as a base and consists of an electrical unit composed of a stretchable silver paste sensitive layer, a pH and lactic acid dual-sensitive conductive network layer, and an exudate sensing layer. This unit converts wound tension, infection markers, and exudate volume into analog electrical signals, which are then preprocessed by a digital unit and converted from analog to digital to form a multi-dimensional digital signal input feedback adjustment module. The feedback adjustment module has a built-in flexible micro control unit that dynamically outputs tension adjustment commands based on real-time signals and preset thresholds, combined with the three-stage healing mode of inflammation, proliferation, and remodeling. The flexible braking module adopts a composite structure of a two-way shape memory alloy spring and a modified elastomer. When energized, the alloy contracts due to Joule heating, applying traction force to the skin around the wound. After de-energization, the spring adaptively rebounds under the combined action of the two-way shape memory effect and the elastomer's restoring force, maintaining wound tension within a safe range. The power supply module continuously supplies power to the system through flexible photovoltaic thin film and micro lithium battery, while the communication module uploads data to an external terminal via Bluetooth to enable remote early warning and parameter control, ultimately providing a stable, low-tension healing environment for the wound and improving the quality of healing.

[0024] The above approach has the following beneficial effects:

[0025] 1. In this solution, the flexible braking module adopts a composite structure of a two-way shape memory alloy spring and a modified elastomer. By pre-setting the stretching amount, the elastomer is in an energy storage state. When energized, the Joule heating drives the shape memory alloy to undergo phase change contraction, applying a precise and gentle adaptive traction force to the skin around the wound. After de-energization, the two-way memory effect and the elastomer's restoring force work together to achieve adaptive rebound and reset. The traction amplitude can be dynamically adjusted according to the real-time tension of the wound. Tension closed-loop control can be completed without external mechanical structures, thereby effectively buffering the instantaneous tension impact caused by human limb movement and skin stretching. This reduces secondary damage such as cracking and tearing of the wound caused by external traction, continuously providing a stable and suitable low-tension healing environment for the wound, reducing problems such as delayed healing, excessive tissue proliferation, and scar aggravation, and improving the quality and aesthetics of wound healing.

[0026] 2. In this solution, the flexible sensing module can simultaneously monitor wound tension, infection markers, and exudate volume in real time, providing multi-dimensional data support for wound status assessment; the feedback adjustment module relies on the flexible micro control unit to automatically adjust the control strategy according to the healing stage, improving the adaptability throughout the healing cycle; the wireless communication module realizes remote data transmission and early warning, facilitating real-time monitoring and individualized intervention by medical staff.

[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] Figure 1 This is a flowchart illustrating the adaptive system of a wound dressing embodiment based on flexible electronics technology according to the present invention.

[0029] Figure 2 This is a diagram showing the positional relationship between the dressing body and each module in an embodiment of the wound dressing based on flexible electronics technology of the present invention.

[0030] Figure 3 This is an overall isometric view of an embodiment of the wound dressing based on flexible electronics technology of the present invention;

[0031] Figure 4 This is an overall isometric sectional view of an embodiment of the wound dressing based on flexible electronics technology of the present invention;

[0032] Figure 5 for Figure 4 Enlarged view of section A.

[0033] The reference numerals in the accompanying drawings include: 1. Adhesive body; 2. Flexible photovoltaic film; 3. Micro lithium battery; 4. Liquid seepage sensing layer; 5. pH and lactic acid dual-sensitive conductive network layer; 6. Tension-sensitive layer; 7. Flexible braking module; 701. Two-way shape memory alloy spring; 8. Flexible micro control unit; 9. Communication module. Detailed Implementation

[0034] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] The following detailed description illustrates the specific implementation method:

[0038] Example 1:

[0039] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a wound dressing based on flexible electronics technology includes a dressing body 1 and an adaptive system. Specifically, the adaptive system includes a flexible sensing module, a flexible braking module 7, a feedback adjustment module, a power supply module, and a communication module 9, such as... Figure 4 As shown, it is preferable to integrate each module onto the application body 1 using a layered approach.

[0040] The power supply module includes a flexible photovoltaic film 2 (preferred model: Flexible PV-100, thickness ≤0.1mm, stretchability ≥50%) and a micro lithium battery 3 (capacity: 100-200mAh, compact and flexible), providing dual protection with solar-assisted power supply and lithium battery backup power supply. This ensures a stable power supply for the flexible sensing module, feedback regulation module, flexible braking module 7, and communication module 9, meeting the system's long-term continuous operation requirements. The communication module 9 uses wireless Bluetooth technology (preferred BLE 5.0 module, transmission distance ≥10m, power consumption ≤10mA) to transmit monitoring data from the flexible sensing module, control commands from the feedback regulation module, and operating parameters (such as contraction strength and rebound state) from the flexible braking module 7 to external terminals (mobile phones, medical monitoring devices) in real time. This not only enables real-time data display and remote early warning but also allows manual adjustment of preset parameters via the terminal, adapting to the individualized needs of different patients and possessing strong clinical applicability.

[0041] The flexible sensing module includes an electrical unit and a digital unit, as detailed below:

[0042] like Figure 5 As shown, the electrical unit comprises a tension-sensitive layer 6, a pH and lactic acid dual-sensitive conductive network layer 5, and an exudate-sensing layer 4, stacked sequentially on a hydrophobic adhesive (preferred model: HS-01, with moderate viscosity and good biocompatibility, reducing wound irritation) as a base. The thickness of each layer is controlled between 0.05 and 0.1 mm, balancing flexibility and sensing sensitivity, allowing for close adhesion to the wound surface without affecting skin breathability. The tension-sensitive layer 6 is prepared using stretchable silver paste (stretch rate ≥100%, temperature coefficient of resistance ≤0.001 / ℃). When subjected to wound tension, the tension-sensitive layer 6 deforms, causing its resistance value to change accordingly with the degree of stretching (e.g., for every 10% increase in stretching, the resistance value increases by 8%–12%), converting the wound tension signal into a resistance signal.

[0043] The pH and lactate dual-sensitive conductive network layer 5 uses graphene as a conductive substrate and is modified with pH-sensitive groups (carboxyl groups) and lactate-sensitive reagents (lactate dehydrogenase). It specifically responds to the pH (4.0–8.0) and lactate concentration (0.1–5 mmol / L) in wound exudate, detecting infection-related markers through electrochemical impedance (response time ≤5 s) or potential changes. The exudate sensing layer 4 uses a flexible capacitive sensing material that changes its dielectric or conductive properties according to the amount of wound exudate (0.1–5 ml), converting the exudate volume information into corresponding capacitance or impedance signals. In other words, all signals acquired by the electrical unit are electrical signals (converted to current signals), which can be directly connected to the digital unit for processing.

[0044] The digital unit amplifies, filters, and performs analog-to-digital conversion on the electrical signals acquired in real time by the electrical unit, forming corresponding multidimensional digital signals (including wound tension, infection markers, and exudate volume), and outputs them to the feedback regulation module. The digital unit preferably employs a low-power signal conditioning chip (model: AD8232) and an analog-to-digital converter chip (model: ADS1115).

[0045] The special feature of this solution is that the flexible braking module 7 includes several modified elastomers (e.g., silicone-modified polyurethane, with an elongation rate ≥200% and a resilience rate ≥95%). The surfaces of the modified elastomers are all wound with two-way shape memory alloy springs 701 (SMA) to form a corresponding composite structure. The two-way shape memory alloy springs 701 are pre-set with an elongation amount (preferably with an elongation rate of 10% to 12% to ensure the subsequent expansion and contraction of the two-way shape memory alloy springs 701). The modified elastomers are in their initial position (without energy storage). When the two-way shape memory alloy spring 701 is energized (i.e., when the skin stretches, causing the wound tension to increase and exceed the preset tension threshold), the two-way shape memory alloy spring 701 rapidly heats up to the phase transition temperature under Joule heating and contracts, simultaneously driving the modified elastomer to contract in the opposite direction to the skin stretching direction, thus counteracting the stretching force of the skin around the wound and achieving tension regulation of the wound, keeping the wound in a low-tension environment. When the skin at the wound is not stretched and the tension drops to the preset safe range, the two-way shape memory alloy spring 701 is de-energized, and the temperature of the two-way shape memory alloy spring 701 drops. Under the action of the two-way memory effect, it returns to the low-temperature phase state (the action is elongation). At the same time, the elastic restoring force stored in the modified elastomer is released. Driven by the elastic restoring force and the two-way shape memory alloy effect, both the modified elastomer and the two-way shape memory alloy spring 701 rebound and elongate along the stretching direction, restoring the tension at the wound to the initial low-tension environment, thus achieving adaptive adjustment and reset of tension to adapt to tension changes caused by human activity.

[0046] Simultaneously, the feedback adjustment module employs a flexible microcontroller unit (MCU) 8 to set the tension response threshold and contraction force gradient of the dual-path shape memory alloy spring 701. Based on multi-dimensional digital signals (primarily wound tension) and the preset tension threshold, it generates corresponding tension adjustment commands and outputs these commands to the flexible braking module 7. The specific control method for the dual-path shape memory alloy spring 701 involves adjusting the current magnitude (0.1–0.5A) and duty cycle (10%–90%) in the SMA (Strain Motion Assist) to control the temperature of the dual-path shape memory alloy spring 701 based on the current thermal effect. This stabilizes the dual-path shape memory alloy spring 701 at the target contraction amount, achieving continuous and adjustable tension control.

[0047] In addition, the feedback adjustment module is also used to dynamically adjust the adaptation mode of the healing stage; among which, the adaptation mode of the healing stage includes the inflammation stage adaptation mode (corresponding to the early stage of wound healing, when the wound tissue is relatively fragile, prone to bleeding, has poor traction resistance, and has a large amount of exudate), the proliferation stage adaptation mode (corresponding to the stage of rapid growth of granulation tissue, migration of epithelial cells and wound contraction, which is the key period of wound healing) and the remodeling stage adaptation mode (corresponding to the stage of orderly arrangement of collagen fibers, maturation of scar tissue and recovery of skin mechanical properties). The flexible micro-control unit 8 incorporates a healing stage grading algorithm, using wound exudate pH and lactic acid concentration as core indicators, combined with exudate volume and tension data for joint judgment. The specific judgment rules are as follows: when the test results are pH 7.5–8.5, lactic acid concentration >3.5 mmol / L, and exudate volume >2 ml / 24h, it is determined to be in the inflammatory phase; when the test results are pH 6.5–7.5, lactic acid concentration 1.0–3.5 mmol / L, and exudate volume 0.5–2 ml / 24h, it is determined to be in the proliferative phase; when the test results are pH 5.5–6.5, lactic acid concentration <1.0 mmol / L, and exudate volume <0.5 ml / 24h, it is determined to be in the remodeling phase. The flexible micro-control unit 8 determines the healing stage in real time based on the above indicator thresholds, sets a preset baseline value for contraction intensity, and then automatically switches to the corresponding tension adjustment mode to achieve precise adaptation throughout the entire cycle.

[0048] The specific implementation process is as follows: The dressing body 1 is applied to the patient's postoperative or chronic wound site, ensuring close contact with the skin. The power supply module powers the entire adaptive system through the flexible photovoltaic film 2 and the micro lithium battery 3. In the flexible sensing module, the tension-sensitive layer 6, the pH and lactic acid dual-sensitive conductive network layer 5, and the exudate sensing layer 4 simultaneously collect electrical signals of wound tension, pH, lactic acid concentration, and exudate volume. These signals are processed by the digital unit and then uploaded to the flexible micro control unit 8.

[0049] When the patient's limb movement causes skin stretching and wound tension to increase beyond a preset tension threshold, the flexible micro-control unit 8 immediately outputs a control command to adjust the energizing current and duty cycle of the dual-path shape memory alloy spring 701. This causes the dual-path shape memory alloy spring 701 to contract rapidly under Joule heating, thereby causing the dressing body 1 to contract together with the dual-path shape memory alloy spring 701 in the opposite direction to the skin stretching, thus counteracting external tension and pulling the wound tension back to a safe range. When the skin returns to a relaxed state and the wound tension decreases, the flexible micro-control unit 8 de-energizes the dual-path shape memory alloy spring 701. Under the combined action of the modified elastomer's restoring force and the dual-path memory effect, the dressing body 1 adaptively resets.

[0050] Throughout the healing cycle, the flexible micro control unit 8 automatically identifies the healing stages based on sensor data as follows:

[0051] During the inflammatory phase, it works with a high contraction intensity, set at 80% to 100% of the preset baseline value. Through a strong active pull-back action, it quickly counteracts the tension impact caused by skin stretching, strongly maintains a low-tension healing environment at the wound site, and reduces wound dehiscence.

[0052] During the proliferation period, the contraction intensity is appropriately reduced to 50% to 70% of the preset baseline value, so as to provide a mild and stable mechanical environment for granulation tissue growth and epithelialization while ensuring effective wound closure.

[0053] During the remodeling phase, the contraction intensity is further reduced to 20%–40% of the preset baseline value, primarily through maintenance-style, light adjustments to minimize stress stimulation, inhibit excessive collagen accumulation, and achieve smooth scar repair. Simultaneously, the communication module 9 uploads real-time monitoring data, tension adjustment status, and healing stage information to a mobile phone or medical terminal via Bluetooth, enabling remote monitoring, abnormal warnings, and parameter adjustments. This provides the wound with a fully adaptive, intelligent, and individualized closed-loop care system.

[0054] Furthermore, the controllable extension and retraction of the dual-path shape memory alloy spring 701 not only enables adaptive adjustment of wound tension but also achieves a synergistic effect of active drainage of wound exudate and enhanced detection accuracy, especially suitable for the nursing needs of wounds with large amounts of exudate and easy retention during the inflammatory phase. In the inflammatory phase adaptation mode, the flexible micro control unit 8, while performing closed-loop tension adjustment, simultaneously controls the dual-path shape memory alloy spring 701 to perform low-frequency reciprocating extension and retraction at a frequency of 0.5 to 1 time / hour and a contraction amplitude of 3% to 5%. Through the small deformation of the dual-path shape memory alloy spring 701 and the modified elastomer, a gentle periodic squeezing action is generated on the skin around the wound, actively squeezing out the tissue fluid and exudate retained in the wound gap to the interface between the wound and the dressing body 1. The squeezed-out fresh exudate can directly and fully contact the pH and lactic acid dual-sensitive conductive network layer 5 and the exudate sensing layer 4, thereby reducing the detection lag and data deviation caused by exudate retention and stratification, shortening the detection response time of infection markers and exudate volume, and further improving the accuracy of healing stage determination. After the test is completed, the exudate can be quickly absorbed and fixed by the built-in absorbent and liquid-locking layer of the dressing body 1, which prevents the exudate from accumulating on the wound surface for a long time, reduces the risk of bacterial growth and infection, and continuously maintains a dry environment on the wound surface.

[0055] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A wound dressing based on flexible electronics technology, characterized in that, It includes a dressing body (1) and an adaptive system, which are integrated through flexible electronics technology; the adaptive system includes a flexible sensing module, a flexible braking module (7), a feedback adjustment module, a power supply module and a communication module (9). The flexible sensing module is used to monitor multidimensional electrical signals at the wound site in real time, convert the multidimensional electrical signals into multidimensional digital signals, and output the multidimensional digital signals to the feedback adjustment module; The feedback adjustment module is used to generate corresponding tension adjustment commands based on multidimensional digital signals and preset tension thresholds, and output the tension adjustment commands to the flexible braking module (7). The flexible braking module (7) is used to apply an adaptive traction force to the skin around the wound according to the tension adjustment command, so that the actual tension of the wound is maintained within the preset tension threshold. The communication module (9) is used to transmit the operating parameters of the flexible sensing module, the feedback adjustment module and the flexible braking module (7) to an external terminal in real time using wireless communication technology, so as to realize remote early warning and parameter control. The power supply module is used to provide power to the flexible sensing module, the feedback regulation module and the communication module (9).

2. The wound dressing based on flexible electronics technology according to claim 1, characterized in that, The monitoring dimensions of multidimensional electrical signals include wound tension, infection markers, and exudate volume.

3. The wound dressing based on flexible electronics technology according to claim 2, characterized in that, The flexible sensing module includes an electrical unit and a digital unit; The electrical unit is used to convert physical quantities such as wound tension, infection markers, and exudate volume into analog electrical signals; The digital unit is used to preprocess and convert analog electrical signals into digital signals, forming multidimensional digital signals and outputting them to the feedback regulation module.

4. The wound dressing based on flexible electronics technology according to claim 3, characterized in that, The electrical unit includes a tension-sensitive layer (6), a pH and lactic acid dual-sensitive conductive network layer (5), and an exudation-sensing layer (4), with a hydrophobic adhesive as the substrate.

5. The wound dressing based on flexible electronics technology according to claim 4, characterized in that, The flexible braking module (7) includes several modified elastomers, each of which is wrapped with a two-way shape memory alloy spring (701), and the two-way shape memory alloy spring (701) is pre-set with a stretch amount.

6. The wound dressing based on flexible electronics technology according to claim 5, characterized in that, When the two-way shape memory alloy spring (701) is energized, it undergoes a phase change and contraction under Joule heating, which drives the modified elastomer to contract synchronously, thereby adjusting the tension of the wound. When the two-way shape memory alloy spring (701) is de-energized, its temperature drops and it recovers to the low-temperature phase under the action of the two-way memory effect. At the same time, the elastic restoring force stored in the modified elastomer is released. Under the combined drive of the elastic restoring force and the two-way shape memory alloy effect, both the modified elastomer and the two-way shape memory alloy spring (701) rebound and elongate along the stretching direction.

7. The wound dressing based on flexible electronics technology according to claim 6, characterized in that, The feedback adjustment module is used to dynamically adjust the tension response threshold and the contraction force gradient of the two-way shape memory alloy spring (701).

8. The wound dressing based on flexible electronics technology according to claim 7, characterized in that, The feedback adjustment module is also used to dynamically adjust the adaptation mode for the healing phase, which includes the adaptation mode for the inflammatory phase, the adaptation mode for the proliferative phase, and the adaptation mode for the remodeling phase.

9. The wound dressing based on flexible electronics technology according to claim 8, characterized in that, The feedback regulation module includes a flexible micro control unit (8).

10. The wound dressing based on flexible electronics technology according to claim 9, characterized in that, The power supply module includes a flexible photovoltaic thin film (2) and a micro lithium battery (3).

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