External application patch and use method thereof

Abstract

The invention provides an external application patch and a using method thereof, and relates to the technical field of medical consumables, the patch comprises a patch body which is pasted on the skin, the patch body comprises a waterproof pasting film and a medicine release layer fixed in the middle of the inner side of the waterproof pasting film, and the medicine release layer is made of medical absorbent cotton; the central gradient cotton piece is fixed in the middle of the inner side of the medicine release layer, and the density of the central gradient cotton piece is gradually reduced from the center to the outside; the infusion channel penetrates through the middle of the medicine release layer, and the outlet end of the infusion channel is aligned to the middle of the central gradient cotton piece. According to the application, the effect of disinfecting or applying medicine to the wound of the patient is also improved while the manpower is saved.

Description

Technical Field

[0001] The present application relates to the technical field of medical consumables, and in particular to an external application patch and a method of using the same. Background Art

[0002] In medical care, many patients need to be treated with topical medications, but traditional methods often have problems such as uneven drug release, difficulty in controlling release time, poor efficacy due to drug volatility, and lack of effective reminder mechanisms. In addition, fixing the topical gauze often requires additional steps and tools, which affects nursing efficiency and patient experience. Summary of the invention

[0003] In order to improve the problem of uneven drug release during external application, which affects nursing efficiency, the present application provides an external application patch and a method of using the same.

[0004] In the first aspect, the present application provides an external application patch, which adopts the following technical solution: An external application patch comprising The patch body is adhered to the skin, and the patch body includes a waterproof film and a drug release layer fixed to the middle of the inner side of the waterproof film, and the drug release layer is made of medical absorbent cotton; The central gradient cotton sheet is fixed in the middle of the inner side of the drug release layer, and the density of the central gradient cotton sheet gradually decreases from the center to the outside; The infusion channel is arranged through the middle of the drug release layer, and the outlet end of the infusion channel is aligned with the middle of the central gradient cotton sheet.

[0005] Furthermore, a slot plate is fixed in the middle of the inner side of the waterproof film, the drug release layer is embedded and installed on the side of the slot plate away from the waterproof film, and the infusion channel is sequentially opened in the middle of the slot plate and the drug release layer.

[0006] Furthermore, an electronic timer is detachably mounted on the outer side of the waterproof film.

[0007] Furthermore, a non-woven fabric layer is arranged on the inner side of the waterproof film around the card slot plate.

[0008] Furthermore, strong adhesive patches are arranged around the waterproof film.

[0009] Furthermore, pressure belts are arranged around the waterproof film, and the strong application is located on the pressure belts.

[0010] Furthermore, a tube fixing clamp is arranged inside the waterproof film, one end of the tube fixing bracket points to the card slot plate and is connected with the card slot plate, and the other end extends to the edge of the waterproof film.

[0011] Furthermore, a liquid storage bag is arranged between the card slot plate and the waterproof film, and the liquid outlet of the liquid storage bag is arranged to be aligned with the infusion channel. By squeezing the liquid storage bag, the liquid outlet of the liquid storage bag is squeezed open, and the liquid stored in the liquid storage bag can be squeezed into the infusion channel.

[0012] In a second aspect, the present application provides a method for using an external application patch, based on the above-mentioned external application patch, comprising the following steps: S1, fix the dressing body, and use a waterproof film to seal the drug release layer and the central gradient cotton sheet on the patient's wound; S2, injecting liquid medicine, piercing the waterproof film with a syringe containing liquid medicine and aligning and inserting it into the infusion channel, and then squeezing the liquid medicine in the syringe into the middle of the drug release layer through the infusion channel. The liquid medicine in the middle of the drug release layer not only gradually penetrates the central gradient cotton sheet along the thickness direction of the central gradient cotton sheet, but also gradually penetrates from the center of the central gradient cotton sheet to the surrounding areas. Since the density of the central gradient cotton sheet gradually decreases from the center to the outside, the humidity of each part of the central gradient cotton sheet close to the patient's wound is similar, so that the central gradient cotton sheet can evenly release the liquid medicine to the patient's wound; S3, timing monitoring, when the liquid drug injection is completed, start the electronic timer for timing monitoring. When the preset time is reached, the electronic timer starts the alarm to remind the patient or medical staff to change or handle the dressing.

[0013] In a third aspect, the present application also provides a method for using an external application, based on the above-mentioned external application, comprising the following steps: S1, fix the dressing body, use a waterproof film to seal the drug release layer and the central gradient cotton sheet on the patient's wound, and at this time, the liquid storage capsule storing the liquid drug is also fixed intact on the patient's wound; S2, injecting liquid medicine, squeezing the liquid storage capsule, so that the liquid outlet of the liquid storage capsule is squeezed open, and the liquid medicine stored in the liquid storage capsule can be squeezed into the infusion channel, and then the liquid medicine reaches the middle of the drug release layer. The liquid medicine in the middle of the drug release layer not only gradually penetrates the central gradient cotton sheet along the thickness direction of the central gradient cotton sheet, but also gradually penetrates from the center of the central gradient cotton sheet to the surrounding areas. Since the density of the central gradient cotton sheet gradually decreases from the center to the outside, the humidity of each part of the central gradient cotton sheet close to the patient's wound is similar, so that the central gradient cotton sheet can evenly release the liquid medicine to the patient's wound; S3, timing monitoring, when the liquid drug injection is completed, start the electronic timer for timing monitoring. When the preset time is reached, the electronic timer starts the alarm to remind the patient or medical staff to change or handle the dressing.

[0014] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present invention integrates multiple functions such as disinfectant or liquid drug release, gradient disinfection or dressing, wound protection and pipeline fixation, which greatly simplifies the nursing process of patients with tubes, reduces the manpower output in the nursing process, and improves the nursing efficiency; 2. The design of the central gradient cotton sheet ensures precise control of the disinfection or dressing range and uniform release, which improves the effect of disinfection or dressing. At the same time, the design of the card slot plate ensures the airtightness of the disinfectant or liquid medicine, avoids the volatilization of the disinfectant or liquid medicine, and further consolidates the effect of disinfection or dressing; 3. By setting an electronic timer, excessive drug release or failure to replace the dressing in time can be avoided, thus improving the scientificity and safety of the treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall front view structure in the embodiment of the present application.

[0017] Figure 2 It is a schematic diagram of the overall rear view structure in the embodiment of the present application.

[0018] Figure 3 It is a schematic diagram of the overall explosion structure in the embodiment of the present application.

[0019] Figure numerals: 1. waterproof film; 2. non-woven fabric layer; 3. pressure belt; 4. strong patch; 5. card slot plate; 6. infusion channel; 7. drainage tube; 8. drug release layer; 9. central gradient cotton sheet; 10. tube fixing clamp; 11. liquid storage bag; 12. electronic timer. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The application embodiment discloses an external application patch and a method of using the same. Figure 1 , Figure 2 and Figure 3An external application patch includes a patch body and a central gradient cotton sheet 9. The patch body includes a waterproof film 1 and a drug release layer 8. The waterproof film 1 is made of transparent medical-grade polyurethane or polyvinyl chloride material, has good air permeability and skin compatibility, and also has good adhesion and waterproof properties. The size of the waterproof film 1 is 15cm x 15cm. The drug release layer 8 is fixed in the middle of the inner side of the waterproof film 1, and the drug release layer 8 is made of highly absorbent and hypoallergenic medical absorbent cotton. Its size is 10cm x 10cm, and the center of the drug release layer 8 coincides with the center of the waterproof film 1. The central gradient cotton sheet 9 is pressed and fixed in the middle of the inner side of the drug release layer 8. Its size is 8cm x 8cm, and the center of the central gradient cotton sheet 9 coincides with the center of the drug release layer 8. The central gradient cotton sheet 9 is composed of multiple layers of cotton sheets of different sizes stacked and pressed together, so that the thickness of the central gradient cotton sheet 9 gradually decreases from the center to the surroundings, so the density of the central gradient cotton sheet 9 gradually decreases from the center to the outside.

[0022] In order to stably fix the drug release layer 8 with the central gradient cotton sheet 9 on the inner side of the waterproof film 1, refer to Figure 1 , Figure 2 and Figure 3 A slot plate 5 is provided between the waterproof film 1 and the drug release layer 8. The outer side of the slot plate 5 is flat and stably bonded to the waterproof film 1, and the inner side is provided with a groove for embedding and installing the drug release layer 8. In order to improve the comfort of wearing the patch, the slot plate 5 is made of medical-grade PVC material with high transparency and high flexibility. The slot plate 5 and the drug release layer 8 are both provided with an infusion channel 6 at the center. The slot plate 5 is provided with a drainage tube 7 in the infusion channel 6. The drainage tube 7 is provided in a funnel shape at one end close to the waterproof film 1, and the other end points to and abuts against the center of the central gradient cotton sheet 9.

[0023] In a feasible embodiment, when a patch is needed to disinfect or apply medicine to the patient's wound, the drainage tube 7 can be quickly found through the transparent waterproof film 1, the syringe can be pierced through the waterproof film 1 and inserted into the drainage tube 7, and then the disinfectant or liquid medicine in the syringe can be squeezed out, so that the solution quickly reaches the middle of the drug release layer 8 under the drainage effect of the drainage tube 7. The liquid medicine in the middle of the drug release layer 8 not only gradually penetrates the central gradient cotton sheet 9 along the thickness direction of the central gradient cotton sheet 9, but also gradually penetrates from the center of the central gradient cotton sheet 9 to the surroundings. Although the liquid medicine content at the center of the central gradient cotton sheet 9 is high and the liquid medicine content around it is low, because the density of the central gradient cotton sheet 9 gradually decreases from its center to the outside, after a certain period of time, the humidity of each part of the central gradient cotton sheet 9 close to the patient's wound is similar, ensuring that the central gradient cotton sheet 9 can evenly release the liquid medicine to the patient's wound. Through the transparent waterproof film 1 and the transparent card slot plate 5, the infiltration of the liquid drug on the drug release layer 8 can be quickly checked. When the drug release layer 8 is completely infiltrated, it can be indicated that the current central gradient cotton sheet 9 has been completely infiltrated, and the liquid drug has been released to the patient's wound more evenly. In addition, the card slot plate 5 can also prevent the liquid drug from overflowing to the outside of the card slot plate 5, ensuring that the waterproof film 1 can be stably attached to the patient's skin.

[0024] In another possible embodiment, referring to Figure 1 , Figure 2 and Figure 3A liquid storage capsule 11 is stably placed between the waterproof film 1 and the card slot plate 5. The liquid storage capsule 11 is made of medical silicone or polyurethane material. Liquid medicine for disinfection or dressing is stored in the liquid storage capsule 11. One end of the liquid storage capsule 11 is set as a liquid outlet, and the rest of the parts are integrally formed. The liquid storage capsule 11 is located on one side of the drainage tube 7, and the liquid outlet of the liquid storage capsule 11 is aligned with the drainage tube 7. The liquid outlet of the liquid storage capsule 11 is hot-melt pressed, and the liquid outlet can only be squeezed open when squeezed. When the content of disinfectant or liquid medicine required by the patient is small, the disinfectant or liquid medicine can be injected into the liquid storage capsule 11 in advance, and the liquid storage capsule 11 is fixed to the outside of the card slot plate 5 through the waterproof film 1. When it is necessary to disinfect or apply medicine to the patient's wound, since the waterproof film 1 has a certain degree of ductility, the liquid storage capsule 11 can be squeezed on the outside of the waterproof film 1 to increase the internal pressure of the liquid storage capsule 11, so that the liquid outlet of the liquid storage capsule 11 is opened, and the liquid medicine stored in the liquid storage capsule 11 can be squeezed into the drainage tube 7, and then the liquid medicine reaches the middle of the drug release layer 8. The liquid medicine in the middle of the drug release layer 8 not only gradually penetrates the central gradient cotton sheet 9 along the thickness direction of the central gradient cotton sheet 9, but also gradually penetrates from the center of the central gradient cotton sheet 9 to the surroundings. Although the liquid medicine content at the center of the central gradient cotton sheet 9 is high and the liquid medicine content around it is low, the density of the central gradient cotton sheet 9 gradually decreases from its center to the outside, so that after a certain period of time, the humidity of each part of the central gradient cotton sheet 9 close to the patient's wound is similar, ensuring that the central gradient cotton sheet 9 can evenly release the liquid medicine to the patient's wound. Through the transparent waterproof film 1 and the transparent card slot plate 5, the infiltration of the liquid drug on the drug release layer 8 can be quickly checked. When the drug release layer 8 is completely infiltrated, it can be indicated that the current central gradient cotton sheet 9 has been completely infiltrated, and the liquid drug has been released to the patient's wound more evenly. In addition, the card slot plate 5 can also prevent the liquid drug from overflowing to the outside of the card slot plate 5, ensuring that the waterproof film 1 can be stably attached to the patient's skin.

[0025] In another embodiment, the above two embodiments can be combined, that is, when the liquid medicine in the liquid storage capsule 11 is used up, if it is still necessary to continue to replenish the medicine for the patient's wound, a syringe can be used to pierce the waterproof film 1, and the liquid medicine can be continued to be injected into the drug release layer 8 and the central gradient cotton sheet 9 through the drainage tube 7, so that the patient's wound can be evenly disinfected or medicated.

[0026] Although the transparent waterproof film 1 and the transparent card slot plate 5 can quickly check the patient's wound disinfection or dressing, in order to further ensure that the patient's wound can be treated in time, refer to Figure 1An electronic timer 12 is detachably mounted on the outside of the waterproof film 1. The electronic timer 12 is temporarily fixed to the outside of the waterproof film 1 by medical tape. After the liquid drug is injected, the electronic timer 12 is started for timing monitoring. When the preset time is reached, the electronic timer 12 activates an alarm to remind the patient or medical staff to replace or handle the dressing.

[0027] Considering that the waterproof film 1 needs to be stably attached to the patient's skin to ensure effective treatment of the patient's wound, Figure 1 , Figure 2 and Figure 3 A non-woven fabric layer 2 is bonded to the inner wall of the waterproof film 1, and the non-woven fabric layer 2 is arranged in a Chinese-shaped shape. The card slot plate 5 is embedded in the Chinese-shaped non-woven fabric layer 2 and stably connected to the non-woven fabric layer 2, so as to further improve the stability of the card slot plate 5 installed on the waterproof film 1. A pressure belt 3 is extended from all sides of the non-woven fabric layer 2, one end of the pressure belt 3 is fixedly connected to the side wall of the card slot plate 5, and the other end extends to the outside of the waterproof film 1, and the pressure belt 3 is stably bonded to the non-woven fabric layer 2. The pressure belt 3 is made of elastic bandage material and has a certain ductility. A strong patch 4 is bonded to the inner wall of the end of the pressure belt 3 away from the card slot plate 5. When the pressure belt 3 is tightened and fixedly bonded to the patient's skin through the strong patch 4, it can provide sufficient pressure to make the patch fit more closely to the patient's skin to prevent the solution from leaking out and air from entering.

[0028] In medical care, some patients have drainage tubes or other tubes inserted into their wounds. When applying external dressings to disinfect or treat wounds with tubes, in order to avoid the presence of the tubes affecting the stability and sealing of the dressing and the patient's skin, please refer to Figure 1 , Figure 2 and Figure 3 A tube fixing clamp 10 is arranged inside the waterproof film 1. The tube fixing clamp 10 is made of a soft and elastic medical grade silicone or polyurethane material. The card slot plate 5 is provided with an embedding groove for accommodating and fixing the tube fixing clamp 10. The side of the tube fixing clamp 10 away from the waterproof film 1 is provided with a receiving groove for accommodating a pipe. The receiving groove on the tube fixing clamp 10 is connected with the groove inside the card slot plate 5, so that when the dressing is attached to the patient's skin, the pipe at the patient's wound can be properly fixed in the receiving groove of the tube fixing clamp 10, avoiding the random swing of the pipe affecting the fitting effect of the dressing and the patient's skin.

[0029] The present application provides a method for using an external application patch, which adopts the following technical solution: S1, fix the dressing body, use the waterproof film 1, the pressure belt 3 and the strong dressing 4 to seal the drug release layer 8 and the central gradient cotton sheet 9 on the patient's wound, and make the pipeline properly placed in the receiving groove of the tube fixing clamp 10; S2, injecting liquid medicine, piercing the waterproof film 1 with a syringe containing liquid medicine and inserting it into the drainage tube 7, and then squeezing the liquid medicine in the syringe into the middle of the drug release layer 8 through the infusion channel 6, the liquid medicine in the middle of the drug release layer 8 not only gradually penetrates the central gradient cotton sheet 9 along the thickness direction of the central gradient cotton sheet 9, but also gradually penetrates from the center of the central gradient cotton sheet 9 to the surroundings; although the liquid medicine content at the center of the central gradient cotton sheet 9 is high and the liquid medicine content around it is low, the density of the central gradient cotton sheet 9 gradually decreases from the center to the outside, so that after a certain period of time, the humidity of various places on the side of the central gradient cotton sheet 9 close to the patient's wound is similar, ensuring that the central gradient cotton sheet 9 can evenly release the liquid medicine to the patient's wound; S3, real-time observation of drug penetration. Through the transparent waterproof film 1 and the transparent card slot plate 5, the infiltration of the liquid drug on the drug release layer 8 can be quickly checked. When the drug release layer 8 is completely infiltrated, it means that the current central gradient cotton sheet 9 has been completely infiltrated, and the liquid drug has been released to the patient's wound more evenly. In addition, the card slot plate 5 can also prevent the liquid drug from overflowing to the outside of the card slot plate 5, ensuring that the waterproof film 1 can be stably attached to the patient's skin; S4, timing monitoring, when the liquid medicine injection is completed, the electronic timer 12 is started for timing monitoring. When the preset time is reached, the electronic timer 12 activates the alarm to remind the patient or medical staff to replace or handle the dressing.

[0030] Another method for using an external application patch provided by the present application adopts the following technical solution: S1, fix the dressing body, use the waterproof film 1, the pressure belt 3 and the strong dressing 4 to seal the drug release layer 8 and the central gradient cotton sheet 9 on the patient's wound, and make the pipeline properly placed in the receiving groove of the tube fixing clamp 10; S2, injecting liquid medicine, squeezing the liquid storage capsule 11, so that the liquid outlet of the liquid storage capsule 11 is squeezed open, and the liquid medicine stored in the liquid storage capsule 11 can be squeezed into the drainage tube 7, and then the liquid medicine reaches the middle of the drug release layer 8. The liquid medicine in the middle of the drug release layer 8 not only gradually penetrates the central gradient cotton sheet 9 along the thickness direction of the central gradient cotton sheet 9, but also gradually penetrates from the center of the central gradient cotton sheet 9 to the surroundings; although the liquid medicine content at the center of the central gradient cotton sheet 9 is high and the liquid medicine content around it is low, the density of the central gradient cotton sheet 9 gradually decreases from its center to the outside, so after a certain period of time, the humidity of each part of the central gradient cotton sheet 9 close to the patient's wound is similar, ensuring that the central gradient cotton sheet 9 can evenly release the liquid medicine to the patient's wound; S3, real-time observation of drug penetration. Through the transparent waterproof film 1 and the transparent card slot plate 5, the infiltration of the liquid drug on the drug release layer 8 can be quickly checked. When the drug release layer 8 is completely infiltrated, it means that the current central gradient cotton sheet 9 has been completely infiltrated, and the liquid drug has been released to the patient's wound more evenly. In addition, the card slot plate 5 can also prevent the liquid drug from overflowing to the outside of the card slot plate 5, ensuring that the waterproof film 1 can be stably attached to the patient's skin; S4, timing monitoring, when the liquid medicine injection is completed, the electronic timer 12 is started for timing monitoring. When the preset time is reached, the electronic timer 12 activates the alarm to remind the patient or medical staff to replace or handle the dressing.

[0031] The present application also provides a method for using an external application patch, which adopts the following technical solution: S1, fix the dressing body, use the waterproof film 1, the pressure belt 3 and the strong dressing 4 to seal the drug release layer 8 and the central gradient cotton sheet 9 on the patient's wound, and make the pipeline properly placed in the receiving groove of the tube fixing clamp 10; S2, injecting liquid medicine, squeezing the liquid storage capsule 11, so that the liquid outlet of the liquid storage capsule 11 is squeezed open, and the liquid medicine stored in the liquid storage capsule 11 can be squeezed into the drainage tube 7, and then the liquid medicine reaches the middle of the drug release layer 8. The liquid medicine in the middle of the drug release layer 8 not only gradually penetrates the central gradient cotton sheet 9 along the thickness direction of the central gradient cotton sheet 9, but also gradually penetrates from the center of the central gradient cotton sheet 9 to the surroundings; although the liquid medicine content at the center of the central gradient cotton sheet 9 is high and the liquid medicine content around it is low, the density of the central gradient cotton sheet 9 gradually decreases from its center to the outside, so after a certain period of time, the humidity of each part of the central gradient cotton sheet 9 close to the patient's wound is similar, ensuring that the central gradient cotton sheet 9 can evenly release the liquid medicine to the patient's wound; S3, drug replenishment, when the liquid drug in the liquid storage capsule 11 is used up, if it is still necessary to continue to replenish the drug to the patient's wound, the waterproof film 1 can be pierced with a syringe, and the liquid drug can be continuously injected into the drug release layer 8 and the central gradient cotton sheet 9 through the drainage tube 7, so that the patient's wound can be evenly disinfected or medicated; S4, real-time observation of drug penetration. Through the transparent waterproof film 1 and the transparent card slot plate 5, the infiltration of the liquid drug on the drug release layer 8 can be quickly checked. When the drug release layer 8 is completely infiltrated, it means that the current central gradient cotton sheet 9 has been completely infiltrated, and the liquid drug has been released to the patient's wound more evenly. In addition, the card slot plate 5 can also prevent the liquid drug from overflowing to the outside of the card slot plate 5, ensuring that the waterproof film 1 can be stably attached to the patient's skin; S5, timing monitoring, when the liquid medicine injection is completed, the electronic timer 12 is started for timing monitoring. When the preset time is reached, the electronic timer 12 activates the alarm to remind the patient or medical staff to replace or handle the dressing.

[0032] The implementation principle of an external application patch and its use method in the embodiment of the present application is as follows: first, a waterproof film 1, a pressure belt 3 and a strong patch 4 are used to seal and cover the drug release layer 8 and the central gradient cotton sheet 9 on the patient's wound, and the pipeline is properly placed in the receiving groove of the tube fixing clamp 10; then, the liquid drug is injected by squeezing the liquid storage capsule 11 and / or the syringe, so that the liquid drug reaches the middle of the drug release layer 8 under the drainage effect of the drainage tube 7; the liquid drug in the middle of the drug release layer 8 not only gradually penetrates the central gradient cotton sheet 9 along the thickness direction of the central gradient cotton sheet 9, but also gradually penetrates from the center of the central gradient cotton sheet 9 to the surrounding areas; although the liquid drug content at the center of the central gradient cotton sheet 9 is high and the liquid drug content at the surrounding areas is low, because the density of the central gradient cotton sheet 9 gradually decreases from its center to the outside, after a certain period of time, the humidity of each part of the central gradient cotton sheet 9 close to the patient's wound is similar, ensuring that the central gradient cotton sheet 9 can evenly release the liquid drug to the patient's wound. Finally, the infiltration of the liquid drug on the drug release layer 8 is observed through the transparent waterproof film 1 and the transparent card slot plate 5, and the timing monitoring of the electronic timer 12 is used to remind the patient or medical staff to replace or handle the dressing in time.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An external application patch, characterized in that: include The patch body is adhered to the skin, and the patch body includes a waterproof film and a drug release layer fixed to the middle of the inner side of the waterproof film, and the drug release layer is made of medical absorbent cotton; The central gradient cotton sheet is fixed in the middle of the inner side of the drug release layer, and the density of the central gradient cotton sheet gradually decreases from the center to the outside; The infusion channel is arranged through the middle of the drug release layer, and the outlet end of the infusion channel is aligned with the middle of the central gradient cotton sheet.

2. The external application patch according to claim 1, characterized in that: A card slot plate is fixed in the middle of the inner side of the waterproof film, a drug release layer is embedded and installed on the side of the card slot plate away from the waterproof film, and an infusion channel is sequentially opened in the middle of the card slot plate and the drug release layer.

3. The external application patch according to claim 2, characterized in that: An electronic timer is detachably mounted on the outer side of the waterproof film.

4. The external application patch according to claim 3, characterized in that: A non-woven fabric layer is arranged on the inner side of the waterproof film around the card slot plate.

5. The external application patch according to claim 3, characterized in that: Strong patches are arranged around the waterproof film.

6. The external application patch according to claim 5, characterized in that: The waterproof film is surrounded by pressure belts, and the strong application is located on the pressure belts.

7. The external application patch according to claim 3, characterized in that: A tube fixing clamp is arranged inside the waterproof film, one end of the tube fixing bracket points to the card slot plate and is connected with the card slot plate, and the other end extends to the edge of the waterproof film.

8. The external application patch according to claim 3, characterized in that: A liquid storage bag is arranged between the card slot plate and the waterproof film, and the liquid outlet of the liquid storage bag is arranged to be aligned with the infusion channel. By squeezing the liquid storage bag, the liquid outlet of the liquid storage bag is squeezed open, and the liquid stored in the liquid storage bag can be squeezed into the infusion channel.

9. A method for using an external application patch, based on an external application patch according to any one of claims 3 to 7, characterized in that: The following steps are included: S1, fix the dressing body, and use a waterproof film to seal the drug release layer and the central gradient cotton sheet on the patient's wound; S2, injecting liquid medicine, piercing the waterproof film with a syringe containing liquid medicine and aligning and inserting it into the infusion channel, and then squeezing the liquid medicine in the syringe into the middle of the drug release layer through the infusion channel. The liquid medicine in the middle of the drug release layer not only gradually penetrates the central gradient cotton sheet along the thickness direction of the central gradient cotton sheet, but also gradually penetrates from the center of the central gradient cotton sheet to the surrounding areas. Since the density of the central gradient cotton sheet gradually decreases from the center to the outside, the humidity of each part of the central gradient cotton sheet close to the patient's wound is similar, so that the central gradient cotton sheet can evenly release the liquid medicine to the patient's wound; S3, timing monitoring, when the liquid drug injection is completed, start the electronic timer for timing monitoring. When the preset time is reached, the electronic timer starts the alarm to remind the patient or medical staff to change or handle the dressing.

10. A method for using an external application patch, based on the external application patch according to claim 8, characterized in that: The following steps are included: S1, fix the dressing body, use a waterproof film to seal the drug release layer and the central gradient cotton sheet on the patient's wound, and at this time, the liquid storage capsule storing the liquid drug is also fixed intact on the patient's wound; S2, injecting liquid medicine, squeezing the liquid storage capsule, so that the liquid outlet of the liquid storage capsule is squeezed open, and the liquid medicine stored in the liquid storage capsule can be squeezed into the infusion channel, and then the liquid medicine reaches the middle of the drug release layer. The liquid medicine in the middle of the drug release layer not only gradually penetrates the central gradient cotton sheet along the thickness direction of the central gradient cotton sheet, but also gradually penetrates from the center of the central gradient cotton sheet to the surrounding areas. Since the density of the central gradient cotton sheet gradually decreases from the center to the outside, the humidity of each part of the central gradient cotton sheet close to the patient's wound is similar, so that the central gradient cotton sheet can evenly release the liquid medicine to the patient's wound; S3, timing monitoring, when the liquid drug injection is completed, start the electronic timer for timing monitoring. When the preset time is reached, the electronic timer starts the alarm to remind the patient or medical staff to change or handle the dressing.

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