Hand-held wound pH meter

Abstract

The application relates to the field of medical devices, and discloses a handheld wound surface pH detector, which comprises a machine body, a probe assembly, a detection circuit and a collection medium. The probe assembly is arranged on the machine body, and comprises a detection end and an electrode arranged on the detection end. The collection medium is a replaceable gel collection medium, which is detachably arranged on the detection end and cooperates with the electrode. The collection medium is used for being attached to a wound tissue surface, so as to cover at least one planar detection area of the wound tissue surface and collect a pH detection signal of the planar detection area. The detection circuit is electrically connected with the electrode, and is used for determining the pH value of the planar detection area according to the detection signal obtained through the collection medium. Through the device, the planar area of the wound tissue surface can be rapidly, accurately and non-invasively detected, and the single-point measurement error and the cross-infection risk are reduced.

Description

Technical Field

[0001] This application relates to the field of medical devices, specifically to a handheld wound pH meter. Background Technology

[0002] The wound healing process is closely related to the pH value of the local microenvironment. Wound pH value can not only reflect the wound healing status, but also be used for infection early warning, treatment effect evaluation and treatment plan adjustment. Therefore, rapid and accurate detection of wound pH value has high clinical application value.

[0003] Most existing pH detection technologies focus on solution samples. Common detection methods include glass electrodes, metal-metal oxide solid electrodes, ion-selective electrodes, fiber optic pH sensors, chemically modified pH sensors, ion-sensitive field-effect transistor pH meters, and pH enzyme sensors. These technologies are generally more suitable for measuring the pH of liquid or effluent samples. Related equipment on the market also primarily focuses on detecting bodily fluid samples such as wound exudate, blood, and urine, or requires the probe to be in full contact with the exudate to complete the detection. Even when existing technologies address wound pH detection, they generally suffer from problems such as inconvenient probe replacement, susceptibility to cross-infection, limited detection area to a single point, and difficulty in performing area-wide detection on the wound tissue surface. Therefore, they often fail to meet the actual clinical needs for detecting pH values ​​on the wound surface. Summary of the Invention

[0004] The purpose of this application is to provide a handheld wound pH meter that can perform rapid, accurate, and non-invasive pH testing on the planar area of ​​wound tissue, and reduce single-point measurement errors and the risk of cross-infection.

[0005] This application discloses a handheld wound pH meter, including a body, a probe assembly, a detection circuit, and a collection medium; The probe assembly is disposed on the body, and the probe assembly includes a detection end and an electrode disposed on the detection end; The collection medium is a replaceable gel-based collection medium, which is detachably disposed on the detection end and cooperates with the electrode. The collection medium is used to adhere to the surface of the wound tissue to cover at least one planar detection area on the surface of the wound tissue and collect the pH detection signal of the planar detection area. The detection circuit is electrically connected to the electrode and is used to determine the pH value of the planar detection area based on the detection signal acquired via the acquisition medium. In a preferred embodiment, the acquisition medium and the detection end are connected by magnetic attraction.

[0006] In a preferred embodiment, the probe assembly includes an electro-signal conversion electrode that acquires the pH detection signal via the acquisition medium that is attached to the surface of the wound tissue.

[0007] In a preferred embodiment, the electrode includes a measuring electrode and a reference electrode for detecting the hydrogen ion activity on the surface of wound tissue.

[0008] In a preferred embodiment, the measuring electrode and the reference electrode acquire potential difference signals via the acquisition medium that is attached to the surface of the wound tissue to characterize the hydrogen ion activity of the planar detection area.

[0009] In a preferred embodiment, the detection circuit includes a signal amplification module for amplifying and converting the potential difference signal acquired by the electrode via the acquisition medium that is attached to the surface of the wound tissue.

[0010] In a preferred embodiment, the detection circuit further includes a temperature compensation module and a calibration module, and is used to determine the pH value of the planar detection area based on the calibrated and temperature-compensated potential signal.

[0011] In a preferred embodiment, the detection circuit is used to determine the pH value of the planar detection area on the surface of the wound tissue based on the correspondence between the calibrated and temperature-compensated potential signal and the hydrogen ion activity.

[0012] In a preferred embodiment, the collection medium is used to flexibly adhere to the surface of the wound tissue to perform non-invasive detection on the planar detection area.

[0013] In a preferred embodiment, the collection medium is a disposable consumable.

[0014] In a preferred embodiment, the acquisition medium forms a detection interface between the wound tissue surface and the electrode, so that the electrode can perform pH detection on the planar detection area of ​​the wound tissue surface through the detection interface.

[0015] In a preferred embodiment, the feature size of the planar detection region is 10 mm to 15 cm.

[0016] In a preferred embodiment, the collection medium is a one-piece molded structure.

[0017] In a preferred embodiment, the body is L-shaped.

[0018] In a preferred embodiment, the body is designed for handheld operation.

[0019] In a preferred embodiment, a display module is also included, which is used to display the pH value of the planar detection area.

[0020] In a preferred embodiment, a temperature detection module is also included for detecting the temperature of the wound.

[0021] In a preferred embodiment, a humidity detection module is also included for detecting the humidity of the wound.

[0022] In this embodiment, an electrode is provided at the detection end of the probe assembly on the body, and a replaceable gel-like collection medium is detachably installed at the detection end. After the collection medium is connected to the detection end by magnetic attraction, it adheres to the surface of the wound tissue and covers at least one planar detection area, so that the electrode can obtain the pH detection signal corresponding to the planar detection area through the collection medium. The detection circuit then determines the pH value of the planar detection area based on the detection signal. Thus, this application does not perform conventional pH measurement on liquid samples or single points, but achieves planar area detection on the surface of wound tissue.

[0023] The specification of this application contains numerous technical features distributed across various technical solutions. Listing all possible combinations of these technical features (i.e., technical solutions) would make the specification excessively lengthy. To avoid this problem, the various technical features disclosed in the above-described invention, the various technical features disclosed in the following embodiments and examples, and the various technical features disclosed in the accompanying drawings can be freely combined to form various new technical solutions (all of which are considered to have been described in this specification), unless such a combination of technical features is technically infeasible. For example, one example discloses feature A+B+C, and another example discloses feature A+B+D+E. Features C and D are equivalent technical means that serve the same function, and technically only one needs to be used; they cannot be used simultaneously. Feature E can technically be combined with feature C. Therefore, the solution A+B+C+D should not be considered as described because it is technically infeasible, while the solution A+B+C+E should be considered as described. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a handheld wound pH meter according to one embodiment of this application; Figure 2 This is a schematic diagram of the handheld wound pH meter after the collection medium has been removed, according to one embodiment of this application. Figure 3 This is a schematic diagram of a handheld wound pH meter according to one embodiment of this application. Detailed Implementation

[0025] In the following description, many technical details are presented to help the reader better understand this application. However, those skilled in the art will understand that the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0026] 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.

[0027] This application relates to a handheld wound pH meter, the structural diagram of which is shown below. Figure 1 As shown, it includes: the body, the probe assembly, the detection circuit, and the acquisition medium.

[0028] The probe assembly is mounted on the machine body and includes a detection end and an electrode mounted on the detection end.

[0029] The collection medium is a replaceable gel-based collection medium that is detachably mounted on the detection end and used in conjunction with the electrode. The collection medium is used to adhere to the surface of the wound tissue to cover at least one planar detection area on the surface of the wound tissue and to collect the pH detection signal of the planar detection area.

[0030] The detection circuit is electrically connected to the electrode and is used to determine the pH value of the area to be detected based on the detection signal acquired through the acquisition medium.

[0031] For ease of understanding, the collection medium in this application can also be understood as a replaceable detection head installed at the front end of the probe assembly. The replaceable detection head is preferably a disposable consumable used to directly contact the wound tissue surface during detection, forming a detection interface between the wound tissue surface and the electrodes inside the probe assembly. Unlike conventional detection methods that directly immerse the electrodes in independent liquid samples, this application obtains the pH detection signal of the corresponding area on the wound surface by having the collection medium adhere to the wound tissue surface, thereby achieving pH value detection of the planar detection area on the wound tissue surface.

[0032] The mechanism of action of this application is briefly explained below: The probe assembly includes a measuring electrode and a reference electrode. The measuring electrode is a pH-sensitive electrode that selectively responds to hydrogen ions, while the reference electrode has a relatively stable potential. During detection, the collection medium is attached to the detection end, allowing the gel-like collection portion of the medium to adhere to the wound tissue surface. Since the wound tissue surface typically contains local exudate, tissue fluid, and moisture, the gel-like collection portion, once attached to the wound surface, forms an ion conduction interface between the wound surface and the measuring and reference electrodes. This allows the measuring and reference electrodes to form a galvanic cell system for detecting the pH value of the wound surface. The measuring electrode selectively responds to the hydrogen ion activity in the wound surface microenvironment, generating a potential difference with the reference electrode. This potential difference corresponds to the pH state of the planar detection area on the wound tissue surface. The detection circuit acquires, amplifies, and converts this potential difference signal, and calculates the pH value of the corresponding area on the wound surface by combining temperature compensation and standard buffer calibration results. Therefore, this application does not involve directly immersing the electrode into an independent liquid sample for detection, but rather establishes a detection interface on the surface of the wound tissue through a collection medium to obtain pH information of the wound surface microenvironment.

[0033] The measuring electrode and reference electrode acquire the potential difference signal of the planar detection area on the surface of the wound tissue via a collection medium. The potential difference and hydrogen ion activity satisfy the Nernst equation. The simplified expression of the Nernst equation at 25℃ can be expressed as: E = E0 + (2.303RT / F) × pH Where E is the electromotive force of the galvanic cell, E0 is the standard electrode potential, R is the gas constant, F is the Faraday constant, and T is the absolute temperature. During detection, the detection circuit first acquires the original potential signal between the measuring electrode and the reference electrode. Then, the signal amplification module amplifies and converts this potential signal. Temperature compensation is then performed based on the temperature detection result. Finally, combined with a calibration curve established beforehand using a standard buffer solution, the potential signal is converted into the corresponding pH value and displayed. The standard buffer solution can be a calibration solution with a known pH value, such as pH 4.00, pH 6.86, and / or pH 9.18 standard buffer solutions, to improve the accuracy and consistency of the detection results.

[0034] In a preferred embodiment of this application, the probe assembly is disposed at the front end of the body and is structurally integrated with the body to facilitate single-handed gripping and operation. The detection end of the probe assembly is located at the end face of the front of the body, and preferably forms a docking end face for aligning with the collection medium. The docking end face is provided with an electrical connection portion and a magnetic connection portion to facilitate positioning and electrical connection between the collection medium and the probe assembly after the collection medium is installed. Furthermore, the outer periphery of the docking end face may form an outer peripheral limiting portion or a supporting edge for limiting, supporting, and guiding the collection medium, thereby improving the stability of the collection medium after installation. In some embodiments, the docking end face may be a substantially flat end face structure; alternatively, the docking end face may also form a partially recessed shallow accommodating area to accommodate part of the electrical connection structure (e.g., electrodes).

[0035] In the illustrated embodiment, the overall outline of the detection end can be oblong, elliptical, or flattened rounded rectangle to adapt to the fitting requirements during wound surface detection. Further, the electrode disposed at the detection end is preferably located in the shallow receiving area. The electrode may include a measuring electrode and a reference electrode for detecting the hydrogen ion activity on the wound tissue surface. Preferably, the electrode can be manifested as at least two spaced-apart electrical signal conversion pins, one end of which is arranged facing the opening side of the shallow receiving area to establish an electrical connection with the collection medium after it is installed, and the other end is electrically connected to the circuitry within the device. The pins can be partially recessed within the shallow receiving area to avoid direct electrode exposure. In other preferred embodiments, the electrode can also be a sheet / block electrode, combined with... Figure 2 As shown, the electrode is embedded or installed in a shallow accommodating area at the front of the detection end. By adopting a sheet-like or block-like structure, the contact area between the electrode and the corresponding connection part of the acquisition medium can be increased to improve the stability of the electrical connection; on the other hand, it also facilitates rapid alignment and reliable bonding during magnetic attraction docking.

[0036] Furthermore, to enable rapid installation and removal between the collection medium and the detection end, the detection end preferably also features a magnetic connection structure. This magnetic connection structure can be positioned in the circumferential or edge areas of the mating surface, for magnetic engagement with the corresponding connection structure on the collection medium. The magnetic connection structure can be implemented using a magnet and a magnetic conductor, or by two mutually attracting magnetic components. In some embodiments, a magnetic positioning structure and a limiting engagement structure can be simultaneously provided to restrict the lateral displacement and rotation of the collection medium relative to the detection end while achieving rapid adsorption. With this configuration, when changing the collection medium, medical personnel only need to bring the collection medium close to the detection end for automatic adsorption and positioning, thereby improving replacement efficiency and reducing operational complexity.

[0037] The collection medium preferably includes a carrier portion and a gel-like collection portion disposed on the carrier portion. The carrier portion is used to connect to the detection end and provide support for the gel-like collection portion; the gel-like collection portion is exposed to the outside for adhering to the wound tissue surface and collecting pH detection signals. Preferably, the carrier portion can be a frame structure with a certain rigidity, that is, the outer periphery of the collection medium can form a connecting frame that matches the contour of the detection end.

[0038] In some other preferred embodiments, a magnetic electrode is provided at the front docking area of ​​the detection end, and a corresponding conductive magnetic electrode is provided on the carrier portion. Thus, when the carrier portion approaches the detection end, it can quickly dock with the detection end under magnetic attraction, and simultaneously establish an electrical connection with the carrier portion through the magnetic electrode, thereby establishing an electrical connection with the gel-like collection portion. During detection, the gel-like collection portion adheres to the surface of the wound tissue to form a detection interface. The magnetic electrode inside the detection end acquires the pH detection signal of the corresponding planar detection area on the surface of the wound tissue via the conductive magnetic electrode of the carrier portion and the gel-like collection portion.

[0039] It should be noted that the electrode in this application is preferably a magnetic electrode, that is, an electrode that combines magnetic connection function and electrical signal detection / conduction function. The magnetic electrode is disposed at the front of the detection end. After the collection medium is installed in place, it achieves rapid docking and positioning with the collection medium through magnetic attraction, and simultaneously establishes an electrical connection with the collection medium to obtain and / or transmit pH detection signals. In a preferred embodiment, the magnetic electrode includes a measuring electrode and a reference electrode. The measuring electrode is used to respond to the hydrogen ion activity on the surface of the wound tissue, and the reference electrode is used to provide a reference signal with a basically stable potential, thereby enabling both to acquire the potential difference signal of the planar detection area on the surface of the wound tissue via the collection medium.

[0040] A gel-based collection section is provided in the middle part of the connecting frame facing the human body. The gel-based collection section can be sheet-like, pad-like, or a tape structure with a certain thickness. The gel-based collection section includes an outer detection surface facing the wound, an inner conductive surface opposite to the outer detection surface, and a gel body connecting the outer detection surface and the inner conductive surface. The outer detection surface is used to directly adhere to the wound tissue surface, and the inner conductive surface is used to make contact with the connecting part on the carrier section or indirectly conduct through the conductive structure in the carrier section, thereby making the gel-based collection section an ion-conducting medium between the wound tissue surface and the detection electrode. Preferably, the gel-based collection section can be formed using medical-grade silicone, medical-grade silicone rubber, or other gel materials with flexibility and ion-conducting adaptability. In some embodiments, the gel-based collection section can be integrally formed with the carrier section; in other embodiments, the gel-based collection section can be embedded, covered, or attached to the carrier section. By adopting the above structure, the gel-based collection part can better conform to the undulations of the wound tissue surface during detection, achieving flexible adhesion, thereby improving local contact and reducing irritation to the wound tissue. Preferably, the gel-based collection part has a certain degree of flexibility and thickness (e.g., 5mm-2cm) so that it conforms to the microscopic undulations of the wound surface when attached to it, allowing the outer detection surface to form sufficient surface contact within the detection area.

[0041] In one specific embodiment, the outer detection surface of the gel-like collection part is preferably a continuous planar detection surface, rather than a needle-like, point-like, or linear contact surface. During detection, the continuous planar detection surface covers at least one planar detection area on the surface of the wound tissue, and comes into contact with the local exudate, tissue fluid, and moisture environment of the wound surface within this planar detection area, thereby forming a continuous ion conduction interface throughout the covered area. Because the gel-like collection part itself has a continuous planar body structure, the hydrogen ion activity information within the covered area can form a corresponding overall response within the gel-like collection part. The detection electrode obtains not a local signal at a single point through the carrier part and the gel-like collection part, but a comprehensive pH detection signal corresponding to the planar detection area. Thus, this application can achieve planar detection of the wound tissue surface area, rather than traditional point-like detection.

[0042] To facilitate disassembly and assembly, some implementations may include protruding tabs on both sides of the collection medium. The operator can remove the collection medium from the detection end by pinching these tabs, or attach a new collection medium to the detection end. This design is particularly suitable for medical procedures, allowing for rapid replacement while wearing gloves and reducing the risk of contamination from direct contact with the detection surface.

[0043] After the collection medium is installed on the detection end, the gel-like collection part constitutes the detection interface between the wound tissue surface and the electrode. Specifically, the outer surface of the gel-like collection part is in contact with the wound tissue surface, while the inner surface is in direct contact with or indirectly conductive with the electrode. When the measuring electrode and the reference electrode acquire detection signals through this detection interface, the detection circuit can determine the pH value of the corresponding area on the wound tissue surface based on the acquired potential-related signal. Therefore, the object detected in this application is not a liquid sample contained in a separate container, but rather the pH state of the corresponding area on the wound tissue surface itself, thus reflecting the local microenvironment of the wound more directly. Furthermore, the detection in this application is not targeted at a single point on the wound surface, but rather at at least one planar detection area; that is, the gel-like collection part covers an area of ​​the wound tissue surface during detection.

[0044] To accommodate wounds of different sizes and shapes, the collection medium and / or probe assembly are preferably configured in multiple different sizes. Specifically, the external dimensions of the collection medium can be selected according to the wound area, with its characteristic dimensions preferably covering a range of 10mm to 15cm; its shape can be designed as oblong, elliptical, circular, strip-shaped, or other irregularly shaped structures suitable for wound adhesion, depending on actual needs. For smaller, more regular-shaped wounds, smaller-sized collection media can be used; for larger, more extended-shaped wounds, larger-sized or strip-shaped collection media can be used.

[0045] In conjunction with the probe assembly, the detection circuit is preferably located inside the device body and electrically connected to the electrodes. The detection circuit may include a signal amplification module for amplifying and converting the detection signal acquired by the electrodes via the acquisition medium; it may also include a temperature compensation module for temperature compensation of the detection signal to improve the accuracy of pH value calculation; furthermore, the detection circuit may include a calibration module for establishing or correcting the correspondence between the detection signal and the pH value based on a standard buffer solution. After the above processing, the detection circuit can output the pH value corresponding to the area of ​​detection and can further send it to the display module for display.

[0046] In addition to pH detection, this application can also be extended to include other wound condition detection functions. For example, in some embodiments, the body or probe assembly may also include a temperature detection module for detecting the temperature of the wound; or a humidity detection module for detecting the humidity of the wound. It can also be further extended to detect wound environmental parameters such as oxygen content. By comprehensively analyzing pH values ​​along with parameters such as temperature and humidity, the wound condition can be assessed more comprehensively. However, it should be noted that the aforementioned temperature detection module, humidity detection module, and other parameter detection modules are all optional and not essential for realizing the core technical solution of this application.

[0047] The device can be designed as a handheld, L-shaped casing, housing the detection circuitry and power module. A display module can be embedded in the upper surface of the handheld portion. The front of the device connects to the probe assembly, while function keys can be located on the rear or side for starting detection, switching modes, performing calibration, or setting parameters. The display module (such as a screen) shows pH value, detection status, adhesion status, and battery level. In some embodiments, status indicator lights and a buzzer can also be included to indicate whether the collection medium is properly installed, effectively adhered to the wound, and whether the current detection is complete. The casing can also be waterproof to meet the practical needs of medical environments.

[0048] Based on the above structure, the usage process of this application can include the following steps: First, select a collection medium of the appropriate specification according to the size, shape, and detection requirements of the wound; then, install the selected collection medium onto the detection end of the probe assembly using a magnetic attachment method, so that it forms a conductive connection with the electrode; next, attach the gel-like collection part to the surface of the wound tissue, so that it covers the area to be detected; then, start the detection, and the detection circuit acquires the detection signal through the electrode and the collection medium, and determines the pH value of the area to be detected; after the detection is completed, the used collection medium can be removed from the detection end and discarded, and a new collection medium can be replaced to perform the next detection. Through the above usage method, the risk of cross-contamination between different wounds can be reduced and the detection efficiency can be improved.

[0049] As can be seen from the above, this application has at least the following beneficial effects: by setting a replaceable gel-type collection medium that cooperates with the electrode at the detection end, and by enabling the collection medium to be quickly installed and removed by magnetic attraction, this application can form a stable planar detection interface on the surface of wound tissue, thereby achieving rapid, accurate and non-invasive detection of the pH value of the wound tissue surface area; at the same time, since the collection medium can be designed as a disposable consumable and different specifications can be replaced according to the size of the wound, this application can also reduce the risk of cross-infection, improve the representativeness of the detection results, and enhance the adaptability of the device to different wound scenarios.

[0050] It should be noted that in this patent application, relational terms such as "first" and "second" are used only 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. In this patent application, if it refers to performing an action according to an element, it means performing the action at least according to that element, including two cases: performing the action only according to that element, and performing the action according to that element and other elements. Expressions such as "multiple," "repeatedly," and "various" include two, two times, two kinds, and more than two, more than two times, and more than two kinds.

[0051] All documents mentioned in this application are considered to be incorporated in their entirety into the disclosure of this application so that they can serve as a basis for modifications if necessary. Furthermore, it should be understood that after reading the foregoing disclosure of this application, those skilled in the art can make various alterations or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. A handheld wound pH meter, characterized in that, This includes the main body, probe assembly, detection circuit, and data acquisition medium; The probe assembly is disposed on the body, and the probe assembly includes a detection end and an electrode disposed on the detection end; The collection medium is a replaceable gel-based collection medium, which is detachably disposed on the detection end and cooperates with the electrode. The collection medium is used to adhere to the surface of the wound tissue to cover at least one planar detection area on the surface of the wound tissue and collect the pH detection signal of the planar detection area. The detection circuit is electrically connected to the electrode and is used to determine the pH value of the planar detection area based on the detection signal acquired via the acquisition medium.

2. The handheld wound pH meter as described in claim 1, characterized in that, The probe assembly includes an electro-signal conversion electrode, which acquires the pH detection signal via the acquisition medium that is attached to the surface of the wound tissue.

3. The handheld wound pH meter as described in claim 2, characterized in that, The electrode includes a measuring electrode and a reference electrode for detecting the hydrogen ion activity on the surface of wound tissue.

4. The handheld wound pH meter as described in claim 3, characterized in that, The measuring electrode and the reference electrode acquire potential difference signals via the acquisition medium that is attached to the surface of the wound tissue to characterize the hydrogen ion activity of the planar detection area.

5. The handheld wound pH meter as described in claim 2, characterized in that, The detection circuit includes a signal amplification module, which is used to amplify and convert the potential difference signal acquired by the electrode via the acquisition medium that is attached to the surface of the wound tissue.

6. The handheld wound pH meter as described in claim 4, characterized in that, The detection circuit also includes a temperature compensation module and a calibration module, and is used to determine the pH value of the planar detection area based on the calibrated and temperature-compensated potential signal.

7. The handheld wound pH meter as described in claim 6, characterized in that, The detection circuit is used to determine the pH value of the planar detection area on the surface of the wound tissue based on the correspondence between the calibrated and temperature-compensated potential signal and the hydrogen ion activity.

8. The handheld wound pH meter as described in claim 1, characterized in that, The collection medium is used to flexibly adhere to the surface of the wound tissue in order to perform non-invasive detection on the planar detection area.

9. The handheld wound pH meter as described in claim 1, characterized in that, The collection medium is a disposable consumable.

10. The handheld wound pH meter as described in any one of claims 1-9, characterized in that, The collection medium forms a detection interface between the wound tissue surface and the electrode, so that the electrode can perform pH detection on the planar detection area of ​​the wound tissue surface through the detection interface.

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