Tension reducing device

Abstract

The utility model provides a tension reducing device, and relates to the technical field of medical equipment. The tension reducing device is used for being arranged on skin with a wound and comprises a sticking layer and a fixing layer, the sticking layer is provided with a sticking face, the sticking face is used for being stuck to the skin, the fixing layer is arranged on the surface, away from the sticking face, of the sticking layer, and the fixing layer can be converted into a second state from a first state under preset conditions; wherein the hardness value of the fixing layer in the first state is smaller than that of the fixing layer in the second state, and the hardness value of the fixing layer in the second state is larger than the elastic modulus value of the skin. When the tension reducing device is arranged at the wound position on the skin, in the transformation process of the fixing layer, the hardness of the fixing layer is gradually increased and is finally larger than the elastic modulus value of the skin, so that the skin surface at the wound position can be subjected to stress shielding to a large extent, the skin surface tension at the wound position is reduced, and the skin tension is reduced. The wound healing and the scar removing effect are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment technology, and in particular to a tension-reducing device. Background Technology

[0002] When the skin is injured and a wound forms, a scar forms during the healing process. The tension of the skin at the wound site pulls and stretches the wound edges, interfering with normal healing and leading to scar hyperplasia, thickening, and contraction, ultimately affecting the scar's appearance and function. A common solution is to apply scar patches to the wound. Their mechanism of action is to reduce skin tension at the wound site, specifically through adhesion, helping the skin to resist stress from the surrounding area to some extent. However, most scar patches on the market are currently made of silicone hydrogel, which itself has a certain degree of tension and pressure, thus limiting their stress-resistance effect. Utility Model Content

[0003] The technical problem to be solved by this invention is to overcome the shortcomings of the existing technology in reducing the skin tension at the wound site by providing a tension-reducing device.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A tension-reducing device for application to skin with a wound, characterized in that the tension-reducing device comprises:

[0006] An adhesive layer having an adhesive surface for adhesion to the skin;

[0007] A fixing layer is disposed on the surface of the adhesive layer opposite to the adhesive surface, and the fixing layer can change from a first state to a second state under preset conditions;

[0008] Wherein, the hardness value of the fixing layer in the first state is less than the hardness value of the fixing layer in the second state, and the hardness value of the fixing layer in the second state is greater than the elastic modulus value of the skin.

[0009] In this solution, the tension-reducing device adopts a structure consisting of an adhesive layer and a fixing layer. When the tension-reducing device is placed on the wound site on the skin, the adhesive layer adheres directly to the skin using its adhesive surface, while the fixing layer is placed on the surface of the adhesive layer facing away from the adhesive surface. By setting preset conditions, the fixing layer changes from a first state to a second state. During this change, its own hardness gradually increases, and the plasticity of the fixing layer decreases after hardening. Furthermore, the hardness value of the fixing layer in the second state is greater than the elastic modulus value of the skin, so that the skin surface at the wound site can obtain a greater degree of stress shielding, reducing the skin surface tension at the wound site, thereby reducing the traction force on the wound, which is more conducive to wound healing and achieves the effect of scar removal.

[0010] In this solution, by further increasing the hardness value of the fixation layer in the second state relative to the elastic modulus value of the skin, the fixation layer in the second state can better provide stress shielding for the skin surface at the wound site, thereby reducing the skin surface tension at the wound site.

[0011] Furthermore, the hardness value of the fixing layer in the first state is less than the elastic modulus value of the skin.

[0012] In this solution, this setting allows the fixing layer to better adhere to the skin surface with wounds in the first state, and then the fixing layer can be changed from the first state to the second state by setting preset conditions, thus ensuring the reliability of the entire tension reduction device.

[0013] In this solution, by further reducing the hardness value of the fixation layer in the first state relative to the elastic modulus value of the skin, the fixation layer can be effectively attached to the surface of the skin along with the adhesive layer, thus reducing the difficulty of attachment in the case of large-area attachment.

[0014] Furthermore, the fixing layer completely covers the adhesive layer.

[0015] In this solution, since the fixation layer is fixed to the skin through the adhesive layer, compared to the staggered arrangement between the fixation layer and the adhesive layer, this setting allows the fixation layer to be set completely in correspondence with the adhesive layer. As the fixation layer hardens, it can completely reduce the surface tension of the skin through the adhesive layer in contact with the skin, thereby further reducing the traction force on the wound.

[0016] Furthermore, the fixing layer and the adhesive layer are either fixedly arranged or integrally formed.

[0017] In this solution, by fixing the fixation layer and the adhesive layer relatively to each other, the two will not detach during the use of the tension-reducing device, ensuring the reliability of the device. At the same time, as the fixation layer hardens, it can more effectively act on the adhesive layer, thereby more effectively reducing the surface tension of the skin. In addition, the fixation layer and the adhesive layer can be integrally molded, that is, the integrally molded tension-reducing device can be adhered to the skin and its own hardness can be increased under preset conditions, so as to maximize the reliability of the tension-reducing device and reduce the surface tension of the skin.

[0018] Furthermore, the tension-reducing device is disposed at the wound location on the skin, and the tension-reducing device has a hollow portion, with the wound correspondingly disposed within the hollow portion.

[0019] In this solution, with this configuration, when the tension-reducing device is placed at the wound location on the skin, the wound is positioned within the perforated portion of the tension-reducing device. This creates stress shielding on a specific skin surface of the wound, effectively defining the working range of the stress shielding. This allows for a more effective reduction of the surface tension of the skin around the wound while avoiding the wound itself. Furthermore, by placing the wound within the perforated portion, the applicability of the tension-reducing device is further expanded. For example, it can be used when there is significant exudate from the wound, when the wound needs ventilation, or when medication needs to be applied or the wound needs to be observed. These conditions can all be addressed using the perforated portion, thus promoting wound healing and scar reduction from a medical treatment perspective.

[0020] Furthermore, the extension direction of the hollow portion on the surface of the tension-reducing device is consistent with the extension direction of the wound;

[0021] And / or, the edge shape of the cutout is a similar shape that is proportionally enlarged relative to the edge shape of the wound;

[0022] And / or, the distance between the edge of the hollowed-out portion and the edge of the corresponding position of the wound is greater than or equal to 1 mm.

[0023] In this solution, by aligning the extension direction of the perforated portion on the surface of the tension-reducing device with the extension direction of the wound, the perforated portion can adapt to the wound's extension path. When the wound is located within the perforated portion, its area can be minimized, allowing the tension-reducing device to provide stress shielding for the skin around the wound's edges. Furthermore, by setting the shape of the perforated portion to be a proportionally enlarged similar shape to the edge of the wound, the wound can be more easily positioned within the perforated portion, and the tension-reducing device can more evenly shield the skin around the wound's edges, ensuring more uniform wound healing. Alternatively, the distance between the edge of the perforated portion and the corresponding edge of the wound can be greater than or equal to 1 mm to optimally achieve stress shielding for the skin around the wound's edges. Simultaneously, this avoids obstruction and facilitates wound observation.

[0024] Furthermore, the minimum dimension between the edge of the hollow portion and the outer edge of the corresponding position of the tension-reducing device is A, and the thickness dimension of the tension-reducing device is B; wherein, A is at least twice B.

[0025] In this solution, the portion between the edge of the hollow part and the outer edge of the tension-reducing device is the part of the tension-reducing device that is attached to the skin surface. By setting the minimum size of this portion to at least twice the thickness of the tension-reducing device, the tension-reducing device is made to have a flat shape, which allows it to be better attached to the skin. At the same time, as the hardness increases, it can act better on the skin, thereby better achieving stress shielding of the skin at the wound site and reducing the surface tension of the skin at the wound site.

[0026] Alternatively, the width of the outer edge of the tension-reducing device is more than twice the width of the wound.

[0027] Furthermore, the tension-reducing device also includes an insulating layer that covers the surface of the fixing layer away from the adhesive layer. The connection relationship between the insulating layer and the fixing layer is configured such that the insulating layer can detach from the fixing layer under the action of an external force.

[0028] In this solution, an isolation layer is covered on the surface of the fixing layer away from the adhesive layer to isolate the fixing layer. When needed, the isolation layer is detached from the fixing layer by external force to avoid the fixing layer reacting with external substances and affecting the performance of the fixing layer.

[0029] Furthermore, the tension-reducing device also includes a partition layer that covers the adhesive surface. The connection relationship between the partition layer and the adhesive surface is configured such that the partition layer can detach from the adhesive surface under the action of an external force.

[0030] In this solution, a barrier layer is set on the adhesive surface to isolate the adhesive surface of the adhesive layer, preventing the adhesive surface of the adhesive layer from sticking to other objects when the tension-reducing device is not in use, thus affecting the use of the tension-reducing device and further improving the user experience.

[0031] Furthermore, the hardness value of the fixing layer in the first state is set such that the fixing layer can deform along with the adhesive layer;

[0032] And / or, the hardness value of the fixing layer in the second state is set such that the fixing layer can cause the adhesive layer to not deform.

[0033] In this solution, the fixing layer can be attached to the skin along with the adhesive layer in the first state, ensuring that the tension-reducing device can be effectively fixed to the skin; at the same time, in the second state, the fixing layer can prevent the adhesive layer from deforming, ensuring that the tension-reducing device can better exert its effect of reducing skin tension on the skin.

[0034] Furthermore, the preset condition is one of the following:

[0035] The surface of the fixing layer is in contact with water;

[0036] The surface of the fixing layer is in contact with oxygen;

[0037] The surface temperature of the fixing layer is changed;

[0038] The surface of the fixing layer is irradiated with ultraviolet light;

[0039] The surface of the fixing layer is sprayed with a reaction reagent;

[0040] The liquid phase component of the fixed layer is evaporated;

[0041] The liquid phase components of the fixed layer are volatilized.

[0042] In this solution, by setting the preset conditions to one of the above-mentioned conditions, the fixing layer can change from the first state to the second state under the preset conditions, thereby more conveniently achieving the purpose of hardness change, and thus achieving the effect of reducing the skin surface tension at the wound site.

[0043] The positive and progressive effects of this utility model are as follows:

[0044] The tension-reducing device employs a structure combining an adhesive layer and a fixing layer. When the device is placed on a wound site on the skin, the adhesive layer adheres directly to the skin using its adhesive surface, while the fixing layer is positioned on the surface of the adhesive layer facing away from the adhesive surface. By setting preset conditions, the fixing layer transitions from a first state to a second state. During this transition, its hardness gradually increases, while its plasticity decreases after hardening. Furthermore, the final hardness value of the fixing layer in the second state exceeds the elastic modulus value of the skin. This achieves a greater degree of stress shielding on the skin surface at the wound site, reducing the surface tension of the skin at the wound site, thereby reducing the traction force on the wound and promoting wound healing and scar reduction. Attached Figure Description

[0045] Figure 1 This is a frontal schematic diagram of a tension-reducing device installed on the skin in one embodiment of the present invention.

[0046] Figure 2 This is a side view of the tension-reducing device in one embodiment of the present invention.

[0047] Figure 3 This is a frontal schematic diagram (a) of another embodiment of the present invention, showing the tension-reducing device disposed on the skin.

[0048] Figure 4 This is a frontal schematic diagram (II) of another embodiment of the present invention, showing the tension-reducing device disposed on the skin.

[0049] Figure 5 This is a schematic diagram of the experimental platform for quantifying the skin tension reduction effect of this utility model.

[0050] Figure 6 This is a schematic diagram of the quantitative experimental state of this utility model (I).

[0051] Figure 7 This is a schematic diagram (II) of the quantitative experimental state of this utility model.

[0052] Explanation of reference numerals in the attached figures:

[0053] Skin 10

[0054] Wound 110

[0055] Tension reducing device 20

[0056] Fixed layer 210

[0057] Adhesive layer 220

[0058] Insulation layer 230

[0059] 240 barrier layers

[0060] 250 hollowed-out section

[0061] Silicone plate 50

[0062] 60 cuts

[0063] Stress detection module 70 Detailed Implementation

[0064] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0065] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0067] Example

[0068] This embodiment provides a tension-reducing device 20, such as Figure 1 and Figure 2As shown, the tension-reducing device 20 can be disposed on the skin 10 with the wound 110, specifically at the location of the wound 110. The tension-reducing device 20 mainly comprises four layers, the two most important being the adhesive layer 220 and the fixing layer 210. Both the adhesive layer 220 and the fixing layer 210 are thin sheet structures, and their outer edges are quadrilateral. One side of the adhesive layer 220 is the adhesive surface, and the other side of the adhesive layer 220 is connected to the fixing layer 210. When the tension-reducing device 20 covers the wound 110, it adheres to the surface of the skin 10 near the wound 110 using the adhesive surface of the adhesive layer 220. Furthermore, the fixing layer 210 of the tension-reducing device 20 has certain characteristics: it can change from a first state to a second state under preset conditions. Its hardness value in the first state is less than its hardness value in the second state, and the hardness value of the fixing layer 210 in the second state is greater than the elastic modulus value of the skin 10.

[0069] By configuring the tension-reducing device 20 into a structure combining an adhesive layer 220 and a fixing layer 210, when the tension-reducing device 20 is positioned at the wound 110 on the skin 10, the adhesive layer 220 adheres directly to the surface of the skin 10 near the wound 110 using its adhesive surface, and the fixing layer 210 is positioned on the surface of the adhesive layer 220 away from the adhesive surface. Then, by setting preset conditions, the fixing layer 210 is transformed from a first state to a second state. During this transformation process, its own hardness gradually increases, and the plasticity of the fixing layer 210 decreases after hardening. Furthermore, the hardness value of the fixing layer 210 in the second state is greater than the elastic modulus value of the skin 10, so that the surface of the skin 10 at the wound 110 can be greatly shielded, reducing the surface tension of the skin 10 at the wound 110, thereby reducing the traction force on the wound 110, which is more conducive to the healing of the wound 110 and achieves the effect of scar removal.

[0070] Specifically, the hardness value of the fixation layer 210 in the second state should be at least greater than the elastic modulus value of the skin 10. A higher hardness value of the fixation layer results in better stress shielding of the skin 10 surface at the wound 110 location, i.e., a better tension reduction effect. This configuration ensures that the hardness value of the fixation layer 210 in the second state is increased relative to the elastic modulus value of the skin 10, thereby enabling the fixation layer 210 to provide greater stress shielding of the skin 10 surface at the wound 110 location in the second state, thus reducing the surface tension of the skin 10 at the wound 110 location.

[0071] It is understood that the elastic modulus of skin 10 refers to the ability of skin 10 to resist elastic deformation when an external force is applied. Different parts of the human body have different elastic modulus values ​​for the corresponding skin 10. Therefore, the elastic modulus value of skin 10 mentioned in this embodiment should be understood as the normal elastic modulus value at a specific location of skin 10.

[0072] Furthermore, the hardness value of the fixing layer 210 of the tension-reducing device 20 in the first state is less than or equal to the elastic modulus value of the corresponding skin 10, so that the fixing layer 210 can better follow the adhesive layer 220 to adhere to the surface of the skin 10 with the wound 110 in the first state. Then, by setting preset conditions, the fixing layer 210 is changed from the first state to the second state, ensuring the reliability of the entire tension-reducing device 20.

[0073] Specifically, the hardness value of the fixing layer 210 in the first state should be less than the elastic modulus value of the skin 10. The lower the hardness value of the fixing layer, the easier it is to adhere to the surface of the skin 10, which is beneficial for relatively large-area adhesion. Through this setting, the hardness value of the fixing layer 210 in the first state is reduced to a certain extent relative to the elastic modulus value of the skin 10, thereby ensuring that the fixing layer 210 can effectively adhere to the surface of the skin along with the adhesive layer 220.

[0074] Combination Figure 2 As shown, the outer edges of the fixing layer 210 and the adhesive layer 220 of the tension-reducing device 20 are correspondingly arranged, meaning that the outer edges of the fixing layer 210 and the adhesive layer 220 can overlap accordingly, so that the fixing layer 210 can completely cover the adhesive layer 220. The reason for this arrangement is that the fixing layer 210 is specifically fixed to the skin 10 through the adhesive layer 220. The mechanical effect of the fixing layer 210 on the skin 10 is achieved by reducing surface tension through the adhesive layer 220 in contact with the skin 10. Therefore, compared to a staggered arrangement between the fixing layer 210 and the adhesive layer 220, this arrangement allows the fixing layer 210 to completely reduce the surface tension of the skin 10 through the adhesive layer 220 in contact with the skin 10 during the hardening process, thereby further reducing the traction force on the wound 110. However, in other embodiments, the fixing layer 210 and the adhesive layer 220 can be arranged in a staggered manner, or the outer edge of the adhesive layer 220 can be smaller than the fixing layer 210, or the outer edge of the fixing layer 210 can be smaller than the adhesive layer 220, as long as the tension-reducing device 20 can be attached to the skin 10 by using the adhesive layer 220, and the hardening of the fixing layer 210 can reduce the surface tension of the corresponding skin 10.

[0075] Furthermore, the fixing layer 210 and the adhesive layer 220 of the tension-reducing device 20 are fixedly arranged to each other, so that they will not detach or undergo relative displacement during the use of the tension-reducing device 20, ensuring the reliability of the use of the tension-reducing device 20. At the same time, as the fixing layer 210 hardens, it can more effectively and stably act on the adhesive layer 220, and more effectively reduce the surface tension of the skin 10 through the adhesive layer 220. Specifically, the fixing layer 210 and the adhesive layer 220 can be fixed by any fixing method existing in the prior art, such as using pre-made adhesive, etc. In a preferred embodiment, the fixing layer 210 and the adhesive layer 220 of the tension-reducing device 20 are integrally molded, that is, the tension-reducing device 20 has both a certain adhesive function and certain characteristics that allow it to change from a first state to a second state under preset conditions, so as to maximize the reliability of the use of the tension-reducing device 20 and reduce the surface tension of the skin 10.

[0076] Furthermore, such as Figure 1 As shown, the tension-reducing device 20 also has a hollowed-out portion 250 in the middle. The hollowed-out portion 250 is actually a through hole opened in the tension-reducing device 20 along its thickness direction. When the tension-reducing device 20 is correspondingly set at the wound 110 position of the skin 10, the wound 110 is correspondingly set in the area formed by the edge of the hollowed-out portion 250. This design creates a stress shield on the surface of the skin 10 at the wound site 110, effectively defining the working range of the stress shield. This allows for a more effective reduction of the surface tension of the skin 10 surrounding the wound 110 while avoiding the wound 110. Furthermore, by placing the wound 110 within the area enclosed by the edge of the perforated portion 250, the applicability of the tension-reducing device 20 can be further expanded. For example, it can be used when there is a large amount of exudate from the wound 110, when the wound 110 needs ventilation, or when medication needs to be applied to the wound 110 or observation is required. This medical treatment is more conducive to the healing of the wound 110 and achieves the effect of scar removal. Similarly, in other embodiments, the tension-reducing device 20 may not have a perforated portion 250, and the tension-reducing device 20 may be directly covered on the wound 110. However, such a setting may reduce safety. It can be used in the early stage of the wound 110 or on a specific wound 110, but it can still reduce the surface tension of the skin 10 at the location of the wound 110, which helps the wound 110 to heal and achieve the effect of scar removal.

[0077] Specifically, the extension direction of the perforated portion 250 on the surface of the tension-reducing device 20 is consistent with the extension direction of the corresponding wound 110. That is, if the wound 110 is elongated, the perforated portion 250 is also set to be elongated, and the extension directions of the two are consistent. With this arrangement, the perforated portion 250 can adapt to the extension direction of the wound 110. When the wound 110 is located within the perforated portion 250, the area of ​​the perforated portion 250 can be minimized, thereby allowing the tension-reducing device 20 to provide stress shielding for the skin 10 around the wound 110.

[0078] like Figure 1 As shown, the edge shape of the hollow portion 250 of the tension-reducing device 20 is also similar to a quadrilateral shape, which is similar to the edge shape of the wound 110 on the skin 10. In order to make the wound 110 able to be placed in the area enclosed by the edge of the hollow portion 250, the edge shape of the hollow portion 250 is set to a similar shape that is proportionally enlarged relative to the edge shape of the wound 110. This makes it easier for the wound 110 to be placed in the hollow portion 250, and at the same time, it also allows the tension-reducing device 20 to more evenly shield the skin 10 around the wound 110, ensuring that the wound 110 heals more evenly. In a preferred embodiment, the distance between the edge of the hollow portion 250 and the edge of the corresponding position of the wound 110 should be greater than or equal to 1 mm, and more preferably greater than or equal to 2 mm, so as to better achieve stress shielding of the skin 10 around the wound 110 by the tension-reducing device 20. At the same time, when the hollow portion 250 surrounds the wound 110, it ensures that there is at least a 5 mm observation window at the wound. Of course, the above-mentioned size setting scheme is only one of the relatively better implementation schemes. The actual 250-degree cutout size setting scheme should also take into account the needs from a medical perspective, so as to determine the size of the cutout area according to the wound condition.

[0079] However, it should be noted that the edge shape of the hollow part 250 and the edge shape of the wound 110 do not have to be similar, as long as the wound 110 is contained within the area enclosed by the hollow part 250.

[0080] Furthermore, the minimum dimension between the edge of the hollow portion 250 and the corresponding outer edge of the tension-reducing device 20 is A, and the thickness of the entire tension-reducing device 20 is B, wherein A is at least twice B. Furthermore, to achieve efficient tension reduction, the preferred range for A should be 4-5 times B. The portion between the edge of the hollow portion 250 and the outer edge of the tension-reducing device 20 is the portion of the tension-reducing device 20 that adheres to the surface of the skin 10, making the tension-reducing device 20 flat. This allows it to adhere better to the skin 10, and as its hardness increases, it can better act on the skin 10, thereby better achieving stress shielding of the skin 10 at the wound 110 location and reducing the surface tension of the skin 10 at the wound 110 location.

[0081] At the same time, such as Figure 1 As shown, the outer edge shape of the tension-reducing device 20 is still quadrilateral, but the distances between the four edges of the quadrilateral and the edges corresponding to the wound 110 may be different. However, it can still perform its function of stress shielding for the skin 10 around the wound 110. However, in other embodiments, such as Figure 3 As shown, the outer edge shape of the tension-reducing device 20 can also be set to resemble the edge shape of the wound 110, that is, the distance between the outer edge of the tension-reducing device 20 and the corresponding edge of the wound 110 is the same. This ensures that the tension-reducing device 20 can provide stress shielding at specific distances from the edge of the wound 110, guaranteeing more uniform healing of the wound 110, while also reducing the number of tension-reducing devices used and saving costs. Furthermore, in a preferred embodiment, there is a preferred option for the distance between the outer edge of the tension-reducing device 20 and the corresponding edge of the wound 110. Specifically, the width of the outer edge of the tension-reducing device 20 should be more than twice the width of the wound to better achieve stress shielding of the skin 10 around the wound 110.

[0082] It should be noted that the shape of the wound 110 on the skin 10 varies greatly, and the corresponding edge shape also varies greatly. For example, as... Figure 4 As shown, the edge shape of the wound 110 is circular. Therefore, corresponding to this circular wound 110, the edge shape of the hollow portion 250 in the tension-reducing device 20 and the outer edge shape of the tension-reducing device 20 can both be set as proportionally enlarged circular shapes. Alternatively, the wound 110 may be just a suture on the skin 10, with a corresponding edge shape resembling a racetrack. In this case, the edge shape of the hollow portion 250 in the tension-reducing device 20 and the outer edge shape of the tension-reducing device 20 can both be set as proportionally enlarged racetrack shapes. The same principle applies to other embodiments, which will not be elaborated further here.

[0083] In actual use, the tension-reducing device 20 can also be pre-set to a larger size. When the tension-reducing device 20 is needed to treat the wound 110 on the surface of the skin 10, the tension-reducing device 20 can be cut according to the size or location of the area where the wound 110 is located, so that the tension-reducing device 20 has a more suitable outer edge shape and size, and the interior of the tension-reducing device 20 has a hollow part 250 with a suitable edge shape and size.

[0084] As described above, the tension-reducing device 20 includes a four-layer structure, which includes a fixing layer 210, an adhesive layer 220, an insulating layer 230, and a barrier layer 240.

[0085] like Figure 1 and Figure 2 As shown, the outer edge of the insulating layer 230 corresponds to the outer edge of the fixing layer 210, so that the insulating layer 230 covers the surface of the fixing layer 210 away from the adhesive layer 220. That is, the adhesive layer 220 and the insulating layer 230 are respectively provided on both sides of the fixing layer 210. The connection relationship between the insulating layer 230 and the fixing layer 210 is set such that the insulating layer 230 can be detached from the fixing layer 210 under the action of external force. The reason for setting the insulating layer 230 on the surface of the fixing layer 210 is that the fixing layer 210 has the characteristic of gradually hardening under preset conditions. If the preset condition is that the surface of the fixing layer 210 is in contact with water or oxygen, the tension-reducing device 20 may harden before it is used. Therefore, by setting the insulating layer 230 on the fixing layer 210 for isolation, the insulating layer 230 can be detached from the fixing layer 210 by external force when it is needed, so as to avoid the fixing layer 210 reacting with external substances and affecting the performance of the fixing layer 210.

[0086] like Figure 1 and Figure 2 As shown, the outer edge of the partition layer 240 corresponds to the outer edge of the adhesive layer 220, so that the partition layer 240 covers the adhesive surface of the adhesive layer 220. That is, a fixing layer 210 and a partition layer 240 are respectively provided on both sides of the adhesive layer 220. The connection relationship between the partition layer 240 and the adhesive surface is configured such that the partition layer 240 can detach from the adhesive surface under external force. By providing the partition layer 240 on the adhesive surface, the adhesive surface of the adhesive layer 220 is isolated, preventing the adhesive surface of the adhesive layer 220 from sticking to other objects when the tension-reducing device 20 is not in use, thus affecting its operation and further improving the user experience.

[0087] The following is a further explanation of the gradual hardening of the fixed layer 210 under preset conditions:

[0088] The fixing layer 210 can change from a first state to a second state under preset conditions, and its hardness value in the first state is less than its hardness value in the second state. Theoretically, when the tension-reducing device 20 is attached to the skin 10, as long as the fixing layer 210 hardens, the surface tension of the skin 10 at the wound 110 location can be reduced. However, in order to better utilize the effect of the tension-reducing device 20, the hardness value of the fixing layer 210 in the first state is set such that the fixing layer 210 can deform along with the adhesive layer 220, so that the fixing layer 210 can adhere to the surface of the skin 10 along with the adhesive layer 220 in the first state, ensuring that the tension-reducing device 20 can be effectively fixed to the skin 10. At the same time, the hardness value of the fixing layer 210 in the second state is set such that the fixing layer 210 can prevent the adhesive layer 220 from deforming, so as to ensure that the tension-reducing device 20 can better exert its effect of reducing the tension of the skin 10.

[0089] By quantifying the hardness values ​​of the fixing layer 210 in the first and second states, the fixing layer 210 can be made to deform in accordance with the adhesive layer 220, and the fixing layer 210 can be made to prevent the adhesive layer 220 from deforming.

[0090] Furthermore, the fixation layer 210 can change from a first state to a second state under preset conditions. These preset conditions can be one of the following: the surface of the fixation layer 210 is in contact with water; the surface of the fixation layer 210 is in contact with an external gas (e.g., oxygen); the temperature of the fixation layer 210 (specifically, the surface temperature) is changed; the surface of the fixation layer 210 is irradiated with ultraviolet light; a reaction reagent is sprayed onto the surface of the fixation layer 210; the liquid phase component of the fixation layer 210 is evaporated; or the liquid phase component of the fixation layer 210 is volatilized. By setting the preset conditions to one of the above, the fixation layer 210 can change from the first state to the second state under these preset conditions, thereby more conveniently achieving the purpose of hardness change, and thus reducing the surface tension of the skin 10 at the wound 110 location.

[0091] The above-mentioned preset conditions are explained in detail below. For specific details, please refer to the relevant existing technical content.

[0092] First, when the surface of the fixed layer 210 comes into contact with water, it can react and transform from a first state to a second state. For example, in the first state, the fixed layer 210 includes polymer chain monomers dispersed in an aqueous medium, specifically including natural polymers and synthetic polymers. Natural polymers include: seaweed-derived polysaccharides, animal-derived proteins, gelatin, silk fibroin, hyaluronic acid, elastin, collagen, chitosan, amino acids, and natural nucleic acids (DNA / RNA chains), etc.; synthetic polymers include: polyacrylic acid (PAA), poly(N-isopropylacrylamide) (PNIPAAM), poly(L-lysine) (PLL), polyacrylamide (PAAm), N-isopropylacrylamide (NIPAAM), sodium acrylate (AAcNa), polyvinyl alcohol (PVA), polyethylene glycol (PEG), and synthetic nucleic acids (DNA / RNA chains), etc. Its hardening principle is non-covalent molecular self-assembly, which is attributed to the reaction occurring in water, rather than the reaction with water molecules themselves. The reaction types are weak non-covalent bonds, such as hydrogen bonds, van der Waals forces, and hydrophobic interactions.

[0093] Secondly, when the surface of the fixed layer 210 comes into contact with oxygen, it can react and change from the first state to the second state. This mainly involves chemical cross-linking achieved through oxidation reactions. Chemical cross-linking is the formation of covalent bonds by the chemically active parts on the main chain or side chain of a macromolecule under appropriate conditions, including condensation reactions, free radical polymerization, high-energy irradiation, and enzymes. Specifically, the principle can be that the aldehyde group of oxidized polysaccharide (oPS) and the amino group of carboxymethyl chitosan (CMC) form an imine bond to generate an oxidized alginate (oALG) and oxidized hyaluronic acid (oHA) hydrogel system that can be used for in-situ cross-linking hydrogels; or it can be a novel hydrogel dressing composed of hydrophobically modified chitosan (hmCS) and oxidized dextran (OD), in which the hydrophobically modified chitosan (hmCS) undergoes chemical cross-linking through a reaction with the aldehyde group of oxidized dextran (OD) to obtain a cured hydrogel.

[0094] Third, when the surface temperature of the fixed layer 210 is changed, a reaction can occur, transforming it from the first state to the second state. This mainly involves the thermally induced entanglement of polymer chains. The principle is that polymers form gels when heated above their phase transition temperatures (e.g., elastin and collagen), while other polymers form gels upon cooling (e.g., gelatin and agarose). Polymers that form gels upon cooling have a higher critical solution temperature (UCST), above which water and the polymer are miscible. By lowering the temperature below the critical solution temperature (UCST), the polymer becomes more hydrophobic and insoluble, forming a gel. Polymers that form gels upon heating have a lower critical solution temperature (LCST), below which they are miscible with water.

[0095] Fourth, when the surface of the fixed layer 210 is irradiated with ultraviolet light, it can react and change from the first state to the second state. This mainly involves photoinduced crosslinking. The principle is that functional groups are introduced into the polymer, making it photocrosslinkable through chemical modification. These functional groups are usually acrylates. When irradiated with ultraviolet light, the photoinitiator forms free radicals, which react with the functional groups of the polymer backbone to form intermolecular bonds, thus playing a crosslinking role.

[0096] Fifth, when the surface of the fixed layer 210 is sprayed with a reactive reagent, it transforms from the first state to the second state through a chemical reaction. This mainly involves ion-induced crosslinking. The principle is that when polyvalent cations (such as Ca2+) are added to an aqueous alginate solution, the polyvalent cations combine with adjacent alginate chains to form inter-chain bridges. Alternatively, carrageenan can be divided into three families based on the position and number of sulfate groups: κ-(kappa), ι-(iota), and λ-(lambda) carrageenan, carrying 1, 2, and 3 sulfate groups respectively. Aqueous solutions of κ- and ι-carrageenan can reversibly form hydrogels in the presence of cations, while λ-carrageenan does not undergo a sol-gel transition. Positive cations in the solution neutralize the charge of the sulfate groups, causing the helices to aggregate more tightly. Divalent cations can effectively promote the formation of strong hydrogels from κ- and ι-carrageenan, while monovalent ions are particularly effective for κ-carrageenan.

[0097] Sixth, when the liquid phase component of the fixed layer 210 is evaporated or volatilized, it changes from the first state to the second state. This situation mainly involves the drying and hardening hydrogel layer. The drying and hardening hydrogel mainly refers to the influence of the concentration of the prepolymer monomer on the hydrogel state. When the type and concentration of the crosslinking agent and the molecular weight of the prepolymer monomer are certain, the local concentration increases as the solvent evaporates or volatilizes, resulting in more crosslinking sites, thereby accelerating the gelation rate. For example, controlling the molecular weight of hyaluronic acid and the concentration of the crosslinking agent dithiothreitol, changing the concentration of hyaluronic acid can achieve the regulation of gelation time and gel hardness.

[0098] In addition to the six methods mentioned above, other conditions existing in the prior art can also be used as preset conditions, as long as the fixation layer 210 is fixed on the skin 10 and can gradually harden. For example, an enzyme cross-linking method can be used, the principle of which can be: transglutaminase catalyzes the formation of a covalent bond between the free amine group of lysine bound to a protein or peptide and the γ-formamide group of glutamine bound to a protein or peptide; or tyrosinase is a copper-containing enzyme that, in the presence of oxygen, catalyzes the oxidation of phenols (such as tyrosine residues and phenols in dopamine) into activated quinones, and the activated quinones mainly react with hydroxyl or amino groups through Michael addition reactions; or the general mechanism of phosphate base transferase catalyzing the formation of synthetic hydrogels is that the phosphate ester base precursor group of the PEG polymer is transferred to the serine residue of the engineered carrier protein through coenzyme A functionalization.

[0099] Based on the above description of the tension-reducing device 20, it can be seen that the tension-reducing device 20 can play a superior role in certain specific situations. For example, the tension-reducing device 20 is suitable for wounds 110 around various joints. Wounds 110 near joints are prone to dehiscence during the healing process due to the traction of joint movement, delaying the healing of wounds 110. By using the tension-reducing device 20 to provide appropriate stress shielding, the wounds 110 located in the hollowed-out portion 250 of the tension-reducing device 20 are less likely to be subjected to mechanical stimulation caused by the traction of the skin 10 during joint movement, and the healing speed is faster. As another example, the tension-reducing device 20 can also be used for tension reduction treatment of wounds 110 after various surgical procedures to replace traditional sutures. After surgery, if the wound 110 is well closed by intradermal sutures, suture-free suturing can be performed using intradermal suturing techniques, so that the wounds 110 within the hollowed-out portion 250 of the tension-reducing device 20 are less likely to be subjected to mechanical stimulation caused by the traction of the skin 10, and the same therapeutic effect can be achieved. For example, the tension-reducing device 20 can also be used to reduce scar hyperplasia after trauma. By using the skin 10 to shield against stress, it significantly reduces tension in the wound area 110, thereby effectively reducing scar hyperplasia caused by mechanical stimulation. At that time, the tension-reducing device 20 could not only be applied in the above-mentioned scenarios, but could also be used in similar situations to exert its function, which will not be elaborated upon here.

[0100] Experimental Example

[0101] By constructing a quantitative experimental platform for skin tension reduction, comparative experiments were conducted to demonstrate that the tension-reducing device 20 provided in the above embodiments has a good effect on skin tension reduction. The specific construction scheme of the experimental platform and the experimental results are as follows:

[0102] To verify the effect of the aforementioned tension-reducing device 20 on skin surface under wound stress, a silicone plate with a hardness of 10 was used to simulate skin tissue. Figure 5As shown, firstly, strong adhesive is used to bond the silicone sheet 50 into a roller shape, and then a uniform outward force is applied inside the roller-shaped silicone sheet 50 (see...). Figure 5 (In the direction indicated by the middle arrow) to stretch the silicone plate 50, keeping its surface moderately taut to simulate the condition of normal skin.

[0103] There are various ways to apply a uniform outward force to the inside of the roller-shaped silicone plate 50. For example, in the current solution, a stack of rolled-up paper is placed inside the roller, and the force of the paper tending to unfold and recover is used as the force to open the silicone plate 50.

[0104] like Figure 6 As shown, a cut 60 is made on the outer surface of the silicone plate 50 with a knife to simulate a wound 110 on the skin 10. Before making the cut 60, a stress detection module 70 (resistance strain gauge, model: BF350-3AA-50CM) is fixed on both sides of the planned cut 60 with 5400 glue and connected to the detection software to obtain the strain at that location for comparative analysis.

[0105] After actually making the incision 60, the strain reading at the current state is used as the baseline (system zeroed) to observe subsequent changes. At this time, the strain values ​​(baseline values) of the four stress detection modules 70 are approximately in the range of 20-30 με.

[0106] After the incision 60 was sutured, the area where the four stress detection modules 70 were located was subjected to significant traction, and the obtained strain value was approximately 2000 με or higher.

[0107] like Figure 7 As shown, after the tension-reducing device 20 was attached to the cut 60, due to the rigidity of the tension-reducing device 20, the strain values ​​of the four stress detection modules 70 decreased accordingly, thus achieving a tension-reducing effect. Furthermore, the tension-reducing effect increased with the increase of the attachment area. The specific data obtained are listed below:

[0108] Large-area tension reduction device Medium area tension reduction device Small area tension reduction device Dependent variable (με) 200-300 600-700 1300-1600

[0109] As can be seen from the table above, by attaching the tension-reducing device 20 at the cut 60, the tension near the cut 60 can be significantly reduced, and the tension-reducing effect increases accordingly with the increase of the pasted area. The terms "large area," "medium area," and "small area" are relative sizes in a lateral comparison, used to reflect the relationship between the tension-reducing effect and the size of the pasted area.

[0110] In addition, materials of the same area but different hardness were applied at the cut 60. The influence of material hardness on the tension reduction effect was reflected by comparing the strain values ​​of the four stress detection modules 70. Specifically, under the same area, (1) ordinary gauze and tape, (2) tension reduction device 20 with a hardness greater than 10, and (3) double-layer tension reduction device 20 (equivalent to a hardness greater than 20) were applied respectively. The specific data obtained are listed below:

[0111]

[0112] As can be seen from the table above, the hardness of the material applied to the incision at 60° significantly affects the tension reduction effect. Although the current solutions for applying ordinary gauze and tape to wounds are convenient to apply, they basically do not have the ability to reduce tension.

[0113] Therefore, the tension-reducing device 20 provided in this solution allows the fixing layer 210 to change from a first state to a second state under preset conditions after being applied to the skin surface. This reduces the difficulty of large-area application by using the softer characteristics of the first state, while achieving the tension-reducing effect by using the harder characteristics of the second state. This solves the contradiction between the tension-reducing effect and the application difficulty in the current technology, making it possible to apply a harder material over a large area near the wound.

[0114] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A tension-reducing device for placement on skin with a wound, characterized in that, The tension-reducing device includes: An adhesive layer having an adhesive surface for adhesion to the skin; A fixing layer is disposed on the surface of the adhesive layer opposite to the adhesive surface, and the fixing layer can change from a first state to a second state under preset conditions; Wherein, the hardness value of the fixing layer in the first state is less than the hardness value of the fixing layer in the second state, and the hardness value of the fixing layer in the second state is greater than the elastic modulus value of the skin.

2. The tension-reducing device as described in claim 1, characterized in that, The hardness value of the fixation layer in the first state is less than the elastic modulus value of the skin.

3. The tension-reducing device as described in claim 1, characterized in that, The fixing layer completely covers the adhesive layer.

4. The tension-reducing device as described in claim 1, characterized in that, The fixing layer and the adhesive layer are either fixedly arranged or integrally formed.

5. The tension-reducing device as described in claim 1, characterized in that, The tension-reducing device is disposed at the wound location on the skin, and the tension-reducing device has a hollowed-out portion, with the wound correspondingly disposed within the hollowed-out portion.

6. The tension-reducing device as described in claim 5, characterized in that, The direction in which the hollowed-out portion extends on the surface of the tension-reducing device is consistent with the direction in which the wound extends. And / or, the edge shape of the cutout is a similar shape that is proportionally enlarged relative to the edge shape of the wound; And / or, the distance between the edge of the hollowed-out portion and the edge of the corresponding position of the wound is greater than or equal to 1 mm.

7. The tension-reducing device as described in claim 6, characterized in that, The minimum dimension between the edge of the hollowed-out portion and the outer edge of the corresponding position of the tension-reducing device is A, and the thickness dimension of the tension-reducing device is B; wherein, A is at least twice B.

8. The tension-reducing device as described in claim 1, characterized in that, The width of the outer edge of the tension-reducing device is more than twice the width of the wound.

9. The tension-reducing device as described in claim 1, characterized in that, The tension-reducing device further includes an insulating layer that covers the surface of the fixing layer away from the adhesive layer. The connection relationship between the insulating layer and the fixing layer is configured such that the insulating layer can detach from the fixing layer under the action of an external force.

10. The tension-reducing device as claimed in claim 1, characterized in that, The tension-reducing device further includes a partition layer that covers the adhesive surface. The connection relationship between the partition layer and the adhesive surface is configured such that the partition layer can detach from the adhesive surface under external force.

11. The tension-reducing device according to any one of claims 1-10, characterized in that, The hardness value of the fixing layer in the first state is set such that the fixing layer can deform along with the adhesive layer; And / or, the hardness value of the fixing layer in the second state is set such that the fixing layer can cause the adhesive layer to not deform.

12. The tension-reducing device as described in claim 11, characterized in that, The preset condition is one of the following: The surface of the fixing layer is in contact with water; The surface of the fixing layer is in contact with oxygen; The surface temperature of the fixing layer is changed; The surface of the fixing layer is irradiated with ultraviolet light; The surface of the fixing layer is sprayed with a reaction reagent; The liquid phase component of the fixed layer is evaporated; The liquid phase components of the fixed layer are volatilized.

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