Foot protection shoe with replaceable functional module and method of replacing

Abstract

The application discloses a replaceable functional module foot protection shoe and a replacement method thereof, and solves the problem that the same pair of shoes cannot switch the mechanical response of the foot bottom high pressure area as required and lack on-site prompt without relying on the sensory pathway when the foot perception ability decreases. The scheme is that: the insole layer is provided with a containing part and an interface structure, the buffer module, the support module and the friction reduction module have the same outer dimensions and are adapted to the same interface structure, and the buffer module, the support module and the friction reduction module can be selectively loaded into the same containing part; the pressure prompt structure corresponding to the containing part is arranged in the shoe sole, the deformable cavity is compressed to the trigger position, the breakable color developing medium capsule is extruded, the deformation mark is formed at the observation window, and the deformation mark is still fixed and retained after the elastic recovery of the deformable cavity, so as to represent the cumulative over-limit events in a period of time; in the preferred embodiment, the inner surface of the vamp is covered with a whole piece of boneless seam contact layer and a power-independent thermochromic layer (440) is stacked, and the pressure prompt structure and the thermochromic layer (440) jointly constitute double passive prompts.

Description

Technical Field

[0001] This invention relates to the field of footwear technology, specifically to a foot protection shoe with replaceable functional modules, and a method for replacing the functional modules of the foot protection shoe. Background Technology

[0002] Cancer patients may develop peripheral neuropathy during chemotherapy, manifesting as a decreased ability to sense pressure and pain in the soles of the feet. In this state, the high pressure generated locally on the soles of the feet during walking may not be immediately apparent to the user, and if this continues for a prolonged period, it can easily lead to subtle, undetectable damage. Therefore, there is a need for foot protection shoes that can provide a switchable biomechanical response to the soles of the feet and deliver high-pressure conditions in a way that is perceptible to the user.

[0003] The existing protective footwear and insole solutions have the following main problems.

[0004] Firstly, the functional padding and the shoe body are fixedly assembled or integrally molded. In this type of solution, the three types of mechanical responses—cushioning, support, and friction reduction—are achieved by different shoe models or different insoles. When the high-pressure zone on the user's sole changes with usage, only the entire shoe or insole can be replaced. The same pair of shoes cannot cover the functional needs that change multiple times during the life of the shoe. For example, Chinese invention patent application CN122350431A discloses a modular ankle support children's shoe. The modularity here means that the components are assembled according to an assembly relationship. The three types of padding do not constitute a replaceable relationship in the same installation position, so it is still impossible to achieve functional switching in a single pair of shoes.

[0005] Furthermore, regarding the specific fixing method of replaceable insoles, Chinese utility model patent CN216983832U discloses a functional insole with replaceable modules. This insole has grooves on it and uses positioning strips and limiting slots to fix the modules. In this type of solution, modules are specifically designed for different parts, and the shapes and interfaces of modules in different parts are different, not interchangeable. Therefore, it is impossible to replace them within the same housing according to changes in their condition during use. Its modular design aims to adapt to different parts, unlike the concept of this solution which uses a single interface structure to carry three types of interchangeable functional modules.

[0006] For example, US Patent No. 11337489B2 discloses a modular orthotic shoe system in which multiple components can be interchanged. This type of interchangeability occurs between different assembly positions or levels, altering the shoe's support characteristics through the stacking of components in different locations. However, it does not provide any technical guidance on how to selectively replace the three functional modules—cushioning, support, and friction reduction—while sharing the same interface structure and housing.

[0007] Secondly, monitoring plantar pressure relies on active sensing and algorithm evaluation. For example, Chinese invention patent application CN122664665A discloses a method and system for foot risk assessment based on shear force estimation and force-temperature fusion. It collects plantar pressure, temperature, and motion data through a data acquisition unit integrated into a smart insole, uploads the data via a communication module, and provides risk assessment results through a data processing module. This type of solution requires power supply, sensing elements, a communication module, and a backend algorithm, resulting in issues with battery life, waterproofing, and maintenance. Furthermore, its feedback on high pressure is presented in the form of an electronic interface, and it loses its alerting capability if there is a power supply or communication failure. For individuals with reduced sensation, the longer the feedback chain, the more potential points of failure there are. Another example is Chinese invention patent application CN122671068A, which discloses a method and device for decomposing and evaluating an athlete's jumping process. It uses plantar pressure data and the three-dimensional coordinates of key points as input to assess athletic ability, but outputs an evaluation result rather than on-site prompts that can be directly read by the user.

[0008] Thirdly, the seams on the inner surface of the shoe cavity create continuous friction points. The instep and toe areas of conventional shoe uppers are made of multiple pieces sewn together, and these seams form protrusions on the inner surface of the shoe cavity. For users with delicate skin and reduced sensation, the continuous friction caused by these protrusions is not easily noticed, and damage can easily occur by the time it is discovered. It should be noted that replacing stitched linings with seamless linings has already been used in the footwear industry; for example, Chinese utility model patent publication number CN202722682U discloses a seamless lining structure. This method itself is known technology, and this solution does not claim it separately, but only uses it as a preferred embodiment to improve long-term wearing comfort.

[0009] Fourth, foot circumference fluctuates during the use period. Some users experience foot edema a few days after using the medication, which then gradually subsides. The fixed circumference shoe opening either creates local pressure during the edema period or loses its restraint after the swelling subsides. Neither of these situations is conducive to the reasonable distribution of pressure on the sole of the foot.

[0010] In addition, the applicant's prior application (application number 202611115657.1) involves medical modular functional shoes used in operating room scenarios. The scenario it is aimed at is standing work in the operating room. Its module division and switching purpose is also different from this solution, and it does not have a local visible prompt function for pressure exceeding the limit. Summary of the Invention

[0011] The technical problem this invention aims to solve is: how to enable the same pair of shoes to switch the mechanical response of the high-pressure zone on the sole as needed during the product's lifespan, under conditions where the foot's ability to perceive pressure and pain decreases, and how to present the state of sole pressure reaching a preset threshold locally in a way that is independent of the user's sensory pathways, power supply, and sensing elements, and how to ensure that this state can still be read after the pressure is released. Furthermore, this solution also addresses the issues of seam friction on the inner surface of the shoe cavity and fluctuations in foot circumference during the product's lifespan.

[0012] To solve the above-mentioned technical problems, the present invention provides a foot protection shoe with replaceable functional modules, which includes a sole, an insole layer, functional modules, a pressure indicator structure, and an upper.

[0013] The outsole has an outsole surface for contact with the ground, with anti-slip treads distributed on the outsole surface. The anti-slip treads are denser in the heel area to facilitate braking. The outsole provides space for pressure indication structures in its thickness direction.

[0014] The insole layer is laid on top of the sole and comes into direct contact with the foot. The insole layer has a receiving portion at least once in either the forefoot or heel area. This receiving portion is a recessed area on the insole layer, and an interface structure is provided within it. In a preferred embodiment, the receiving portion includes a forefoot receiving portion and a heel receiving portion, and the interface structures within the two receiving portions are identical in specifications.

[0015] The functional modules include at least a cushioning module, a support module, and a friction-reducing module. All functional modules have the same external dimensions and are adapted to the same interface structure, allowing them to be selectively installed into the same receiving portion and locked by the interface structure. The difference between the three lies in their Shore hardness and surface friction characteristics, rather than their shape or interface: the cushioning module absorbs impact and reduces peak plantar pressure with a lower Shore hardness; the support module provides support with a higher Shore hardness, limiting excessive deformation of the plantar surface; and the friction-reducing module reduces tangential friction between the sole and insole with a lower surface friction coefficient, reducing shearing action. Because the interface structures of the two receiving portions are identical, the same functional module can also be interchanged between the forefoot and heel areas, allowing the three mechanical responses to be combined as needed between the two areas.

[0016] The pressure indication structure is located within the sole and corresponds vertically to the area containing the receiving part. It features a deformation cavity that elastically recovers along the sole thickness, a color-developing medium capsule within the deformation cavity, and an observation window aligned with the deformation cavity. When the deformation cavity is compressed to a preset compression amount along the sole thickness under pressure, it is compressed to the trigger position, squeezing the color-developing medium capsule. The capsule releases the color-developing medium, resulting in a visible deformation mark at the observation window. The compression ratio of the deformation cavity is calculated as the ratio of the height difference before and after compression to the initial height. When the compression ratio is not less than the factory-calibrated compression ratio threshold, the deformation cavity is compressed to the trigger position. Since the color-developing medium changes color upon release, an over-limit event occurring at a certain moment is preserved as a cumulative trace over a period of time, which can be read later. The pressure indication structure consists entirely of a closed elastic cavity and a color-developing medium, and does not include power supply, sensing, or communication components.

[0017] In a preferred embodiment, the color-developing medium inside the color-developing medium capsule (520) is an irreversible color-developing substance, and the inner surface of the observation window (530) is provided with a color-developing medium fixing layer. After the color-developing medium capsule (520) ruptures, the color-developing medium comes into contact with the fixing layer and is absorbed and fixed by it, so that the color change does not disappear with the elastic recovery of the deformation cavity (510). Therefore, the deformation mark presented at the observation window (530) records whether the deformation cavity (510) has reached the trigger position in a previous period of time, rather than just recording the instantaneous pressure state at the time of reading.

[0018] A thermochromic layer (440) is also stacked on the inner surface of the shoe upper (400); the thermochromic layer (440) changes color when the temperature of the corresponding area reaches a preset temperature threshold, which is used to indicate local temperature abnormalities in the contact area of ​​the foot. Peripheral neuropathy caused by tumor chemotherapy is often accompanied by decreased temperature sensation, and users have difficulty in noticing local overheating or ischemia of the sole. The thermochromic layer (440) provides a second passive cues in a way that does not rely on power sources and sensing elements, and together with the pressure cues structure (500), it constitutes dual passive sensing.

[0019] The thermochromic layer (440) can be made of thermochromic microcapsule coating or thermochromic liquid crystal material, and its color change temperature can be set by the composition ratio of the material in a conventional manner.

[0020] The upper covers the insole layer. In a preferred embodiment, the inner surface of the upper is also covered with a single piece of seamless contact layer: the seamless contact layer covers the instep and toe areas and has no seams in these two areas to reduce friction between seams and the skin; the seamless contact layer is detachably connected to the upper and can be removed separately for cleaning and replacement.

[0021] This invention also provides a method for replacing functional modules in a foot protection shoe. The method includes: determining a target functional module from a self-cushioning module, a support module, and a friction-reducing module according to the correspondence between foot condition and functional module type; unlocking the installed functional module from its interface structure and removing it from the receiving part; installing the target functional module into the receiving part according to the same interface structure and locking it; transmitting plantar pressure to a pressure indication structure through the target functional module; when the deformation cavity is compressed to the trigger position, the colorimetric medium sac releases the colorimetric medium and forms a deformation mark at the observation window; reading the deformation mark at the observation window to determine the target functional module for the next cycle and returning to the determination step, forming a closed loop between cycles. Beneficial effects

[0022] Compared with the prior art, the present invention has the following beneficial effects.

[0023] First, the same pair of shoes can cover multiple changes in functional needs during their service life. The three functional modules have the same external dimensions and interface specifications, and can be replaced one by one in the same housing. When the high-pressure area on the sole of the foot is moved, only the insole needs to be replaced, without replacing the entire shoe or insole.

[0024] Second, the feedback of excessive pressure does not rely on the user's sensory pathways. The pressure indication structure generates a visible deformation mark when the plantar pressure reaches a preset threshold. Although the user cannot perceive the high pressure, they can see the mark through the observation window, and an accompanying person can also read it on their behalf.

[0025] Third, the prompt structure is passive and contains no electronic components. The prompt is generated by a closed elastic cavity and a color-developing medium, without any power supply, sensing, or communication components. It has no burden of battery life or waterproofing, can be washed with the shoe, and does not change the shoe's normal wearing shape.

[0026] Fourth, the interfaces of the forefoot and heel are standardized, allowing the three mechanical responses of cushioning, support, and friction reduction to be combined as needed between the two areas, rather than being fixed in a single position.

[0027] Fifth, in the preferred embodiment, the seam friction on the inner surface of the shoe cavity is further reduced. The seamless contact layer covers the instep and toe areas with a single piece of fabric. This area contains no seams and can be removed separately for washing, which is beneficial for long-term wear maintenance. This method itself is a known technology, so it is only a preferred embodiment and does not constitute an essential technical feature of this solution.

[0028] Sixth, it adapts to fluctuations in foot circumference. The wide opening, combined with adjustable fasteners, allows the shoe opening circumference to adjust with changes in foot circumference, avoiding localized pressure when the circumference increases and preventing loss of restraint when the circumference decreases.

[0029] Seventh, module replacement is driven by the correspondence between type and mechanical response, rather than by the user's subjective feelings, making the basis for replacement repeatable. Attached Figure Description

[0030] Figure 1 is a schematic diagram of the overall structure of a foot protection shoe with replaceable functional modules according to the present invention; Figure 2 is a partially enlarged schematic diagram of the relationship between the pressure indication structure and the functional modules in Figure 1; Figure 3 is a flowchart illustrating a method for replacing functional modules in a foot protection shoe according to the present invention.

[0031] Figure labeling: 100 Outsole, 110 Outsole and anti-slip tread, 200 Insole layer, 210 Forefoot housing, 220 Heel housing, 230 Interface structure, 240 Ventilation channel, 300 Functional module, 310 Cushioning module, 320 Support module, 330 Friction-reducing module, 400 Upper, 410 Seamless contact layer, 420 Adjustable fastener, 430 Wide opening, 440 Thermochromic layer, 500 Pressure indicator structure, 510 Deformation cavity, 520 Color developing medium capsule, 530 Viewing window. Detailed Implementation

[0032] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The following examples are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. Example 1

[0033] As shown in Figure 1, the foot protection shoe of this embodiment includes a sole 100, an insole layer 200, a functional module 300, an upper 400, and a pressure indication structure 500. The lower surface of the sole 100 is an outsole 110, on which anti-slip patterns are distributed, with the patterns in the heel area being relatively denser. The insole layer 200 is laid on top of the sole 100, with a forefoot receiving portion 210 in the forefoot area and a heel receiving portion 220 in the heel area. Both receiving portions are recessed areas on the insole layer, each containing an interface structure 230 of the same specifications. The insole layer 200 also has ventilation channels 240, which run through the upper and lower sides of the insole layer and connect to the sole 100, with their direction avoiding the two receiving portions.

[0034] Functional module 300 includes a cushioning module 310, a support module 320, and a friction-reducing module 330. All three have a thickness of 6 mm and Shore hardness of 30, 60, and 45 respectively; that is, the Shore hardness of the cushioning module is lower than that of the friction-reducing module, and the Shore hardness of the friction-reducing module is lower than that of the support module. All three have the same external dimensions and are compatible with the interface structure 230, allowing them to be selectively installed in either the heel receiving portion 220 or the forefoot receiving portion 210, and their positions can be interchanged between the two receiving portions. The interface structure 230 employs a snap-fit ​​structure, which has a locked state that locks the functional module within the receiving portion and an unlocked state that allows the functional module to be removed from the receiving portion.

[0035] As shown in Figure 2, a pressure indication structure 500 is disposed within the sole 100 and corresponds vertically to the heel housing 220. It includes a deformation cavity 510, a colorimetric medium bladder 520, and an observation window 530. The deformation cavity 510 is a closed cavity that can elastically recover along the thickness direction of the sole, with an initial height of 5 mm. The colorimetric medium bladder 520 is placed within the deformation cavity 510 and is a ruptureable bladder; its rupture pressure threshold corresponds to the preset compression amount of the deformation cavity. The observation window 530 is located on the outer wall of the sole 100 and aligned with the deformation cavity 510, and is sealed by a transparent material. The compression ratio of the deformation cavity 510 is calculated as the ratio of the height difference before and after compression to its initial height; the factory-calibrated compression ratio threshold is 0.55. When the pressure from the sole is transmitted to the pressure indication structure 500 via the functional module 300 and the receiving part, the deformation cavity 510 is compressed along the thickness direction of the sole. When the compression ratio is not less than 0.55, the deformation cavity 510 is compressed to the trigger position and squeezes the color developing medium bladder 520. The color developing medium bladder 520 ruptures and releases the color developing medium, and a visible deformation mark appears at the observation window 530. After the pressure is unloaded, the deformation cavity 510 elastically recovers, but the color change formed by the released color developing medium is retained.

[0036] The upper 400 covers the insole layer 200, and its inner surface is connected by a single piece of seamless contact layer 410 via hook and loop fasteners. This contact layer covers the instep and toe areas, and there are no seams in these two areas. It can be removed from the upper 400 for washing. The upper 400 has a wide opening 430, which is covered by an adjustable fastener 420. The adjustable fastener 420 has multiple adjustable tightening positions along the opening direction of the wide opening. Example 2

[0037] This embodiment illustrates the execution process of the functional module replacement method, as shown in Figure 3. Step S1: Determine the target functional module for this cycle based on the correspondence between foot condition and functional module type. This correspondence is based on the attenuation rate of peak plantar pressure: assuming the peak plantar pressure without the functional module is a reference value, the percentage decrease in peak pressure after installing the selected functional module is the attenuation rate of that module. Select one of the three functional modules whose attenuation rate is not less than the target attenuation rate. For example, if the high plantar pressure is concentrated in the heel area in this cycle and cushioning is required, then a cushioning module is selected.

[0038] Step S2: Loosen the adjustable fastener 420 and open the wide opening 430, lift the insole layer 200, and unlock and remove the friction-reducing module from the interface structure 230 of the heel receiving part 220.

[0039] Step S3: Push the buffer module into the receiving part 220 according to the same interface structure 230 and lock it to ensure that it does not become loose; since the three modules have the same external dimensions and interface specifications, the loading action is the same for the three modules.

[0040] Step S4: Adjust the adjustable tensioning element 420 to a medium tightness according to the foot circumference of the day; during daily walking, the foot pressure is transmitted to the pressure indication structure 500 through the buffer module, and the deformation cavity 510 is compressed under pressure; when the compression rate reaches or exceeds the threshold, the color developing medium sac 520 releases the color developing medium and forms a deformation mark at the observation window 530.

[0041] Step S5: Read the deformation mark at observation window 530: If no mark appears, maintain the current functional module type; if a mark appears, determine the area where the plantar high pressure is located according to the location of the mark, and determine the type of the target functional module for the next cycle and its accommodating part accordingly, then return to step S1. Example 3

[0042] This embodiment illustrates the process for handling changes in foot circumference. When a user experiences foot edema, the shoe opening, which was originally moderately tight, experiences localized pressure. At this point, the adjustable fastener 420 is loosened and adjusted one notch to increase the shoe opening circumference. Simultaneously, the seamless contact layer 410 is removed from the upper 400, cleaned, dried, and then reinstalled. After several days, when the circumference returns to normal, the adjustable fastener 420 is tightened one notch to restore constraint. Throughout the entire process, the functional module 300 remains unchanged, and the housing and interface structure 230 are unaffected. Example 4

[0043] This embodiment provides a configuration where two receiving sections are combined by region. When the forefoot area primarily focuses on friction reduction and the heel area primarily focuses on cushioning, the friction reduction module is installed in the forefoot receiving section 210 and the cushioning module is installed in the heel receiving section 220. In the next cycle, if the high pressure on the sole of the foot shifts to the forefoot area, the positions of the cushioning module and the friction reduction module are swapped between the two receiving sections without replacing any components. Since the two interface structures 230 are identical, the swapping action can be completed directly. Example 5

[0044] This embodiment illustrates the configuration of passive temperature indication and applicable population. Based on Embodiment 1, a thermochromic layer (440) is superimposed on the side of the sutureless contact layer (410) facing the sole. This thermochromic layer (440) changes from transparent to colored when the temperature in the sole contact area reaches 38 to 42 degrees Celsius, indicating a local temperature abnormality. The thermochromic layer (440) and the pressure indication structure (500) provide passive indications in both temperature and pressure dimensions, respectively, and neither relies on a power source or sensing element. The foot protection shoe is intended for individuals with peripheral neuropathy caused by tumor chemotherapy, diabetic foot, or those undergoing long-term bedridden rehabilitation whose ability to perceive pressure and pain in the sole of their feet is reduced. This allows them to receive indications through the deformation mark at the observation window (530) and the color change of the thermochromic layer (440) even when they are unable to detect high pressure or local temperature abnormalities in the sole of their feet. In the above embodiments, the Shore hardness of the functional modules, the orientation of the ventilation channels (240), and the circumference adaptation of the wide opening (430) and the adjustable fastening element (420) are all consistent with the aforementioned embodiments. The foot protection shoe is a purely mechanical structure without power supply, sensing, and communication components, and its pressure and temperature indicators do not rely on power supply, sensing, and communication components.

[0045] All structural components of this invention can be manufactured using conventional processes in the art: the sole (100), insole layer (200), and functional module (300) can be injection molded or compression molded from elastomers; the deformation cavity (510) can be integrally molded from an elastic material; the observation window (530) can be injection molded from a transparent polymer material and heat-sealed to the side wall of the sole (100); and the thermochromic layer (440) and the seamless contact layer (410) can be cut from fabric or film and then bonded or sewn together. The technical effects of this invention are directly determined by the above structural relationships and can be deduced by those skilled in the art based on the above structural relationships without relying on specific process parameters or specific experimental conditions.

[0046] In the above embodiments, the initial height of the deformation cavity can be 2 mm to 8 mm, the compression ratio threshold can be 0.4 to 0.7, the thickness of the functional module can be 3 mm to 10 mm, the Shore hardness of the buffer module can be 20 to 40, the Shore hardness of the friction-reducing module can be 35 to 55, and the Shore hardness of the support module can be 50 to 70. The above values ​​are only used to illustrate one possible implementation of the present invention and are not intended to limit the scope of protection of the present invention.

[0047] The above-mentioned numerical range can be selected by those skilled in the art in a conventional manner based on the weight distribution of the user group, shoe specifications, and the hardness and compression characteristics of the materials used. The rupture pressure threshold of the colorimetric medium capsule (520) is determined by the capsule's material, wall thickness, and the pressure-bearing area within the deformation cavity (510). The correspondence between the initial height of the deformation cavity (510), the compression ratio threshold, and the rupture pressure threshold can be determined by those skilled in the art based on the compression characteristics of the elastic material used in the deformation cavity (510) and the pressure resistance characteristics of the capsule, without relying on specific experimental conditions. Data compliance and ethical design

[0048] The pressure indication structure of this invention is a purely mechanical structure, containing no data acquisition, storage, uploading, or identity-linking components. It does not generate any electronic data related to a natural person's identity and therefore does not involve personal information processing or data compliance risks. The deformation marks formed at the observation window are merely physical traces, and their reading is performed by the user or their authorized caregiver in the presence of the user, and does not constitute remote monitoring of the user's condition. The use of this invention does not alter existing diagnostic and treatment procedures, nor does it replace on-site judgment by professionals. The trace information output by this invention is only for subsequent manual reading and reference and should not be used as the basis for any conclusive judgment, complying with the relevant provisions of Article 5, Paragraph 1 of the Patent Law regarding public interest and ethics.

Claims

1. A foot protection shoe with replaceable functional modules, characterized in that, The shoe includes a sole (100), an insole layer (200), a functional module (300), a pressure indicator structure (500), and an upper (400). The sole (100) has an outsole surface (110) for contacting the ground, and the outsole surface (110) is provided with anti-slip patterns. The insole layer (200) is laid on top of the sole (100), and the insole layer (200) has a receiving portion (210, 220) at least in one of the forefoot area and the heel area, and the receiving portion (210, 220) is provided with an interface structure (230). The functional module (300) includes at least a cushioning module (310), a support module (320), and a friction-reducing module (330). Each of the functional modules (300) has the same external dimensions and is adapted to the interface structure (230) so that they can be selectively installed into the same receiving portion. The receiving part (210, 220) is locked by the interface structure (230); the pressure indication structure (500) is disposed in the sole (100) and corresponds vertically to the area where the receiving part (210, 220) is located. The pressure indication structure (500) has a deformation cavity (510) that can elastically recover along the thickness direction of the sole (100), a color developing medium sac (520) placed in the deformation cavity (510), and an observation window (530) that is aligned with the deformation cavity (510). When the deformation cavity (510) is compressed to the trigger position and squeezes the color developing medium sac (520) when the pressure it receives causes the compression amount along the thickness direction of the sole (100) to reach a preset compression amount, the deformation cavity (510) is compressed and squeezes the color developing medium sac (520), causing the color developing medium sac (520) to release the color developing medium and present a visible deformation mark at the observation window (530); The color developing medium capsule (520) is a ruptureable capsule. The rupture pressure threshold of the capsule corresponds to the preset compression amount of the deformation cavity (510). After the deformation cavity (510) elastically recovers from the trigger position along the thickness direction of the sole (100), the deformation mark is still fixedly retained at the observation window (530), so that the deformation mark represents the cumulative over-limit event over a period of time. The upper (400) covers the insole layer (200).

2. The foot protection shoe with replaceable functional modules according to claim 1, characterized in that, The upper (400) is provided with a wide opening (430) and an adjustable fastening member (420) covering the wide opening (430). The adjustable fastening member (420) is provided with multiple adjustable tightening positions along the unfolding direction of the wide opening (430), so that the circumference of the shoe opening is adjusted with the change of the circumference of the foot.

3. The foot protection shoe with replaceable functional modules according to claim 1, characterized in that, The accommodating part includes a forefoot accommodating part (210) and a heel accommodating part (220). The interface structure (230) in the forefoot accommodating part (210) and the heel accommodating part (220) has the same specifications, so that each of the functional modules (300) can interchange positions between the forefoot accommodating part (210) and the heel accommodating part (220).

4. The foot protection shoe with replaceable functional modules according to claim 1, characterized in that, The buffer module (310), the friction-reducing module (330), and the support module (320) have the same thickness, and the Shore hardness of the buffer module (310) is less than that of the friction-reducing module (330), the Shore hardness of the friction-reducing module (330) is less than that of the support module (320), and the surface friction coefficient of the friction-reducing module (330) is less than that of the buffer module (310) and the support module (320); the Shore hardness of the buffer module (310) is 20 to 40, the Shore hardness of the friction-reducing module (330) is 35 to 55, and the Shore hardness of the support module (320) is 50 to 70.

5. The foot protection shoe with replaceable functional modules according to claim 1, characterized in that, The interface structure (230) is one of the snap-on structure, the rotary snap structure and the hook-and-loop structure. The interface structure (230) has a locked state that locks the functional module (300) in the receiving part (210, 220) and an unlocked state that allows the functional module (300) to be removed from the receiving part (210, 220).

6. The foot protection shoe with replaceable functional modules according to claim 1, characterized in that, A thermochromic layer (440) is also stacked on the inner surface of the shoe upper (400). The thermochromic layer (440) changes color when the temperature of the corresponding area reaches a preset temperature threshold, which is used to indicate the local temperature abnormality in the foot contact area. The thermochromic layer (440) does not rely on power supply and sensing element, and the thermochromic layer (440) and the pressure indication structure (500) together constitute a dual passive indication that does not rely on the user's sensory pathway.

7. The foot protection shoe with replaceable functional modules according to claim 1, characterized in that, The inner surface of the shoe upper (400) is covered with a whole piece of seamless contact layer (410), which covers the instep area and the toe area and does not contain any seams in the instep area and the toe area. The seamless contact layer (410) is detachably connected to the shoe upper (400), so that the seamless contact layer (410) can be removed from the shoe upper (400) separately.

8. The foot protection shoe with replaceable functional modules according to claim 1, characterized in that, It is intended for individuals with peripheral neuropathy, diabetic foot, or those undergoing long-term bed rest and rehabilitation who are prone to undetected foot injuries due to decreased sensitivity to pressure and pain in the soles of their feet. The peripheral neuropathy includes peripheral neuropathy caused by chemotherapy for tumors, and the foot protection shoe is a purely mechanical structure without power supply, sensing, or communication components.

9. A method for replacing functional modules in a foot protection shoe, characterized in that, The foot protection shoe includes a sole (100), an insole layer (200) laid on top of the sole (100), and an upper (400) covering the insole layer (200). The insole layer (200) is provided with a receiving portion (210, 220), and an interface structure (230) is provided inside the receiving portion (210, 220). The sole (100) is provided with a pressure indication structure (500) corresponding vertically to the area where the receiving portion (210, 220) is located. The pressure indication structure (500) has a deformation cavity (510), a color developing medium capsule (520) placed in the deformation cavity (510), and an observation window (530) aligned with the deformation cavity (510). The method includes the following steps: Step S1, according to the correspondence between foot state and functional module type, The target functional module is determined from the self-buffering module (310), the support module (320), and the friction reduction module (330); Step S2: The functional module is unlocked from the interface structure (230) and taken out from the receiving part (210, 220); Step S3: The target functional module is installed into the receiving part (210, 220) according to the same interface structure (230) and locked; Step S4: The foot pressure is transmitted to the pressure prompting structure (500) through the target functional module. When the deformation cavity (510) is compressed to the trigger position, the color developing medium sac (520) releases the color developing medium and forms a deformation mark at the observation window (530); Step S5: The deformation mark at the observation window (530) is read to determine the target functional module for the next cycle and return to step S1.

10. The method for replacing the functional modules of the foot protection shoe according to claim 9, characterized in that, In step S1, the correspondence is based on the attenuation rate of the peak pressure on the sole of the foot, and one of the buffer module (310), the support module (320) and the friction reduction module (330) is selected as the target functional module so that the attenuation rate is not less than the target attenuation rate.

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