Jiayu intelligent bandage based on microcurrent and electric pulse and its control method

Abstract

The present invention provides a Jiayu smart bandage based on microcurrent and electric pulse and a control method thereof, which relates to the technical field of bandages. The smart bandage includes an external protective structure, an intermediate circuit structure and an internal contact structure. The external protective structure includes a shell, an elastic band and a drug storage structure. The internal contact structure includes a sensor component, a drug delivery component, an electric pulse generator and a microcurrent generator. The intermediate circuit structure is used to: determine wound information according to physiological indicator data; determine drug delivery flow; if the wound is healing, determine the first current amplitude of the microcurrent stimulation signal; if the wound is not infected, determine the second current amplitude and the second current frequency of the pulse stimulation signal. According to the present invention, the recovery status of the wound can be understood in time, without disassembling the bandage to cause secondary damage to the wound, the drug delivery structure can be controlled to deliver precise drug delivery, and the tissue at the wound can be stimulated to enhance cell repair and improve the recovery speed.

Description

Technical Field

[0001] The present invention relates to the technical field of bandages, and in particular to a Jiayu smart bandage based on microcurrent and electric pulse and a control method thereof. Background Art

[0002] In the related art, the main function of the bandage for wound healing is to isolate the wound from the external environment to prevent secondary contamination of the wound by microorganisms in the environment. At the same time, in combination with drugs, the drugs can act on the wound and promote wound healing. However, for wounds with a long recovery period, it is impossible to understand the recovery status of the wound in time, and it is necessary to check the wound and change the dressing many times, so the bandage needs to be disassembled, and frequent disassembly will cause secondary damage to fragile tissues.

[0003] The information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0004] The present invention provides a Jiayu smart bandage based on microcurrent and electric pulse and a control method thereof, which can solve the technical problems that the related technology cannot timely understand the recovery status of the wound, and the frequent disassembly of the bandage causes secondary damage to fragile tissues.

[0005] According to a first aspect of the present invention, there is provided a Jiayu smart bandage based on microcurrent and electric pulse, comprising: an external protective structure, an intermediate circuit structure and an internal contact structure;

[0006] The external protection structure includes a shell, an elastic band and a drug storage structure, wherein the shell is used to protect the intermediate circuit structure and the internal contact structure, the elastic band is used to contact and fix the smart bandage to the wound, and the drug storage structure is used to store drugs;

[0007] The internal contact structure includes a sensor component, a drug delivery component, an electric pulse generator and a micro-current generator, wherein the sensor component is used to detect physiological index data at the wound position, the drug delivery component is used to absorb the drug stored in the drug storage structure and release the drug to the wound, the electric pulse generator is used to generate a pulse stimulation signal, and the micro-current generator is used to generate a micro-current stimulation signal;

[0008] The intermediate circuit structure is used for:

[0009] Receiving physiological indicator data detected by the sensor component;

[0010] Determining wound information according to the physiological indicator data;

[0011] Determining the drug delivery flow rate of the drug delivery component according to the physiological indicator data;

[0012] determining whether the wound is healing according to the wound information;

[0013] If the wound is healing, determining a first current amplitude of the microcurrent stimulation signal according to the physiological indicator data;

[0014] determining whether the wound is infected according to the wound information;

[0015] If the wound is not infected, determining a second current amplitude and a second current frequency of the pulse stimulation signal according to the physiological indicator data;

[0016] The drug administration flow rate is sent to the drug administration component, the first current amplitude is sent to the microcurrent generator, and the second current amplitude and the second current frequency are sent to the electric pulse generator.

[0017] According to a second aspect of the present invention, a control method of a Jiayu smart bandage based on microcurrent and electric pulse is provided, and the method is used for the intermediate circuit structure of the Jiayu smart bandage based on microcurrent and electric pulse, comprising:

[0018] Receiving physiological indicator data detected by the sensor component;

[0019] Determining wound information according to the physiological indicator data;

[0020] Determining the drug delivery flow rate of the drug delivery component according to the physiological indicator data;

[0021] determining whether the wound is healing according to the wound information;

[0022] If the wound is healing, determining a first current amplitude of the microcurrent stimulation signal according to the physiological indicator data;

[0023] determining whether the wound is infected according to the wound information;

[0024] If the wound is not infected, determining a second current amplitude and a second current frequency of the pulse stimulation signal according to the physiological indicator data;

[0025] The drug administration flow rate is sent to the drug administration component, the first current amplitude is sent to the microcurrent generator, and the second current amplitude and the second current frequency are sent to the electric pulse generator.

[0026] Technical effect: According to the present invention, the recovery status of the wound can be timely understood through the sensor component of the internal contact structure, and a drug storage structure is provided in the external protective structure, and the drug can be administered through the drug administration component of the internal contact structure, so there is no need to change the dressing frequently, and there is no need to disassemble the bandage to cause secondary damage to the wound. Furthermore, the intermediate circuit structure can also control the drug administration structure to accurately administer the drug based on the recovery status of the wound detected by the sensor component, so that the dosage meets the wound's demand for the drug, and can perform microcurrent and electric pulse stimulation based on the detected physiological indicator data, thereby stimulating the tissue at the wound, enhancing cell repair, and improving the recovery speed. When judging whether the wound is infected, conditional functions in multiple aspects can be set based on the change rules of conductivity, pH value, blood oxygen content and temperature when the wound is infected, so as to obtain the judgment values ​​of the above multiple aspects, and then the judgment value of wound infection is obtained by combining the judgment values ​​of multiple aspects, thereby improving the accuracy and objectivity of judging wound infection. When judging whether a wound is healing, conditional functions in multiple aspects can be set based on the changing patterns of conductivity, pH value, blood oxygen content, temperature and humidity when the wound is healing, so as to obtain the judgment values ​​in the above multiple aspects, and then obtain the wound healing judgment value by combining the judgment values ​​in multiple aspects, so as to improve the accuracy and objectivity of judging whether the wound is healing. When determining the drug delivery flow rate, the severity of the wound and the degree of demand for drugs can be expressed by the change in the measured conductivity and pH value of the wound relative to the conductivity and pH value of the normal skin surface, and the maximum value of the degree of demand for drugs determined by the conductivity and the degree of demand for drugs determined by the pH value can be used as the actual drug demand, so as to meet the wound's demand for drugs to the greatest extent, and then obtain an accurate drug delivery flow rate, which can achieve precise drug delivery to the wound and help the wound heal. When setting the microcurrent stimulation signal, the severity of the wound and the degree of need for auxiliary recovery of the microcurrent stimulation signal can be indicated by the change in the measured conductivity, pH value and blood oxygen content of the wound relative to the conductivity, pH value and blood oxygen content of the normal skin surface, and the maximum value of the degree of need calculated by three methods is used as the actual degree of need for auxiliary recovery of the microcurrent stimulation signal, so as to meet the needs of the wound for auxiliary recovery to the greatest extent, and then obtain the accurate strength of the microcurrent stimulation signal, which can achieve precise stimulation of the tissue at the wound and help the wound heal. When setting the electric pulse generator, the value range of the second current amplitude and the second current frequency can be set, and it is ensured that the minimum intensity of the pulse stimulation signal can meet the wound's intensity requirement for the pulse stimulation signal, so that the pulse stimulation signal can achieve the effect of helping the wound heal.In addition, the duration of stimulation can be set in the same way as the overall stimulation effect, and the second current amplitude and the second current frequency can be selected within the value range again after the stimulation duration is reached. This can avoid collective adaptability and tolerance, maintain a good stimulation effect, and help wound healing.

[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and do not limit the present invention. Other features and aspects of the present invention will become more apparent from the following detailed description of exemplary embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other embodiments can be obtained according to these drawings without creative work.

[0029] Figure 1 A schematic diagram of a Jiayu smart bandage based on microcurrent and electric pulse according to an embodiment of the present invention is exemplarily shown;

[0030] Figure 2 A flow chart of a control method of the Jiayu smart bandage based on microcurrent and electric pulse according to an embodiment of the present invention is exemplarily shown. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0032] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0033] Figure 1 A schematic diagram of a Jiayu smart bandage based on microcurrent and electric pulse according to an embodiment of the present invention is exemplarily shown, wherein the smart bandage comprises: an external protective structure, an intermediate circuit structure and an internal contact structure;

[0034] The external protection structure includes a shell, an elastic band and a drug storage structure, wherein the shell is used to protect the intermediate circuit structure and the internal contact structure, the elastic band is used to contact and fix the smart bandage to the wound, and the drug storage structure is used to store drugs;

[0035] The internal contact structure includes a sensor component, a drug delivery component, an electric pulse generator and a micro-current generator, wherein the sensor component is used to detect physiological index data at the wound position, the drug delivery component is used to absorb the drug stored in the drug storage structure and release the drug to the wound, the electric pulse generator is used to generate a pulse stimulation signal, and the micro-current generator is used to generate a micro-current stimulation signal;

[0036] The intermediate circuit structure is used for:

[0037] Receiving physiological indicator data detected by the sensor component;

[0038] Determining wound information according to the physiological indicator data;

[0039] Determining the drug delivery flow rate of the drug delivery component according to the physiological indicator data;

[0040] determining whether the wound is healing according to the wound information;

[0041] If the wound is healing, determining a first current amplitude of the microcurrent stimulation signal according to the physiological indicator data;

[0042] determining whether the wound is infected according to the wound information;

[0043] If the wound is not infected, determining a second current amplitude and a second current frequency of the pulse stimulation signal according to the physiological indicator data;

[0044] The drug administration flow rate is sent to the drug administration component, the first current amplitude is sent to the microcurrent generator, and the second current amplitude and the second current frequency are sent to the electric pulse generator.

[0045] According to the Jiayu smart bandage based on microcurrent and electric pulses of the embodiment of the present invention, the recovery status of the wound can be timely understood through the sensor component of the internal contact structure, and a drug storage structure is provided in the external protective structure, and the drug can be administered through the drug administration component of the internal contact structure, so there is no need to change the dressing frequently, and there is no need to disassemble the bandage to cause secondary damage to the wound. Furthermore, the intermediate circuit structure can also control the drug administration structure to accurately administer the drug based on the recovery status of the wound detected by the sensor component, so that the drug administration amount meets the wound's demand for the drug, and can perform microcurrent and electric pulse stimulation based on the detected physiological indicator data, thereby stimulating the tissue at the wound, enhancing the cell repair effect, and improving the recovery speed.

[0046] According to one embodiment of the present invention, the external protective structure may include a shell, an elastic band and a drug storage structure. The shell may be a soft shell that can protect the intermediate circuit structure and the internal contact structure. The elastic band can be used to fix the smart bandage to the wound. For example, if the wound is on the arm, the elastic band can be used to surround and bind the arm so that the internal contact structure contacts the wound and is fixed to the wound. The drug storage structure can store medicines, such as liquid medicines. The drug storage structure can be connected to the drug delivery component of the internal contact structure. The drug delivery component can extract the liquid medicine and release it to the wound. In addition, the drug delivery component can have a mesh atomizer. The liquid medicine will encounter resistance when passing through the mesh structure. The resistance is proportional to the speed of the liquid. When the flow rate of the liquid medicine increases, the resistance will also increase accordingly, thereby avoiding damage to the wound caused by a large flow rate. The liquid medicine can also be released evenly, that is, evenly sprayed on the wound.

[0047] According to one embodiment of the present invention, the internal contact structure includes a sensor component, a drug delivery component, an electric pulse generator and a microcurrent generator. Among them, a variety of sensors can be integrated in the sensor component, which are used to detect the conductivity, pH value, blood oxygen content, temperature, humidity and other data at the wound location. The drug delivery component, the electric pulse generator and the microcurrent generator can all perform corresponding processing under the control of the intermediate circuit structure. For example, the drug delivery component can deliver drugs according to the set drug delivery flow rate under the control of the intermediate circuit structure, the electric pulse generator can generate an electric pulse stimulation signal according to the set current amplitude and current frequency under the control of the intermediate circuit structure, and the microcurrent generator can generate a microcurrent stimulation signal according to the set current amplitude under the control of the intermediate circuit structure.

[0048] According to one embodiment of the present invention, the intermediate circuit structure may include a control chip and a flexible circuit. The control chip is used to generate control instructions for the drug delivery component, the electric pulse generator and the microcurrent generator. The flexible circuit is used to connect the control chip with the drug delivery component, the electric pulse generator and the microcurrent generator, and is used to provide functions such as power and communication. For example, the flexible circuit is connected with a battery and a Bluetooth communication component, which can be used to provide power for the control chip, the drug delivery component, the electric pulse generator and the microcurrent generator, and the control chip can communicate with the background server via the Bluetooth communication component.

[0049] According to one embodiment of the present invention, the intermediate circuit structure can receive a variety of physiological indicator data detected by the sensor component, and use part or all of the physiological indicator data to perform calculations, thereby generating control instructions for the drug delivery component, the microcurrent generator and the electric pulse generator to control the drug delivery flow of the drug delivery component, control the first current amplitude of the microcurrent stimulation signal generated by the microcurrent generator, and control the second current replication and second current frequency of the pulse stimulation signal generated by the electric pulse generator.

[0050] According to one embodiment of the present invention, the intermediate circuit structure can calculate the physiological indicator data to determine the current wound information, such as whether the wound is infected, whether the wound is healing, etc. Determining the wound information according to the physiological indicator data includes: acquiring the physiological indicator data at the start and end of the detection cycle respectively; determining the first conductivity, the first pH value, the first blood oxygen content and the first temperature at the wound location according to the physiological indicator data at the start of the detection cycle, and determining the second conductivity, the second pH value, the second blood oxygen content, the second temperature and the second humidity at the wound location according to the physiological indicator data at the end of the detection cycle; determining whether the wound is infected according to the first conductivity, the first pH value, the first blood oxygen content and the first temperature; determining whether the wound is healing according to the first conductivity, the first pH value, the first blood oxygen content, the first temperature, the second conductivity, the second pH value, the second blood oxygen content, the second temperature and the second humidity; obtaining the wound information according to whether the wound is infected and whether the wound is healing.

[0051] According to one embodiment of the present invention, the duration of the detection cycle can be 30 minutes, 1 hour, etc., and the present invention does not limit the duration of the detection cycle. The detection is performed once every 12 hours or 1 day, and a variety of physiological indicator data are obtained at the beginning and end of the detection cycle. For example, the first conductivity, the first pH value, the first blood oxygen content and the first temperature at the wound position at the beginning of the detection cycle, and the second conductivity, the second pH value, the second blood oxygen content, the second temperature and the second humidity at the end of the detection cycle, and then based on the above physiological indicator data, it is judged whether the wound is infected and whether the wound is healing.

[0052] According to one embodiment of the present invention, determining whether a wound is infected based on a first conductivity, a first pH value, a first blood oxygen content and a first temperature includes: setting an upper limit of the wound pH value, an upper limit of the wound conductivity, a lower limit of the wound blood oxygen content and an upper limit of the wound temperature; determining whether the wound is infected based on the first conductivity, the first pH value, the first blood oxygen content, the first temperature, the upper limit of the wound pH value, the upper limit of the wound conductivity, the lower limit of the wound blood oxygen content and the upper limit of the wound temperature.

[0053] According to one embodiment of the present invention, determining whether a wound is infected according to a first conductivity, a first pH value, a first blood oxygen content, a first temperature, an upper limit of a wound pH value, an upper limit of a wound conductivity, a lower limit of a wound blood oxygen content, and an upper limit of a wound temperature includes: determining a first conductivity judgment value J according to formula (1), formula (2), formula (3), and formula (4): C,1 , the first pH value judgment value J pH,1 , the first blood oxygen content judgment value J O,1 and the first temperature judgment value J T,1 ,

[0054] J C,1 =if(C1≥C th,max ,1,0) (1)

[0055] J pH,1 =if(pH1≥pH th,max ,1,0) (2)

[0056] J O,1 =if(O1≤O th,min ,1,0) (3)

[0057] J T,1 =if(T1≥T th,max ,1,0) (4)

[0058] Wherein, C1 is the first conductivity, pH1 is the first pH value, O1 is the first blood oxygen content, T1 is the first temperature, C th,max is the upper limit of wound conductivity, pH th,max is the upper limit of wound pH, O th,min is the lower limit of wound blood oxygen content, T th,max is the upper limit of wound temperature, if(*) is the conditional function; the wound infection judgment value J is determined according to formula (5) I ,

[0059] J I =α1J C,1 +α2J pH,1 +α3J O,1 +α4J T,1 (5)

[0060] Among them, α1, α2, α3 and α4 are preset weights; if the wound infection judgment value is greater than or equal to the first preset threshold, wound infection is determined.

[0061] According to one embodiment of the present invention, healthy, intact skin has a slight acidity. When the skin is damaged to form a wound, its pH value will change. In the early stage of hemostasis and inflammation of the wound, due to the release of metabolic waste and the activity of immune cells, the pH value still indicates that the wound is weakly acidic. However, when the wound is infected, its pH value tends to increase. For example, in burn patients, local wound infection can cause the pH value of the wound exudate to increase significantly. Therefore, it can be determined whether the wound is infected based on the detection of the pH value at the wound. The conditional function of formula (1) indicates that if the first pH value is higher than or equal to the upper limit of the wound pH value, the conditional function value is 1, otherwise, the conditional function value is 0, that is, if the first pH value is higher than or equal to the upper limit of the wound pH value, the judgment result based on pH (that is, the first pH value judgment value) is 1, indicating that the wound may be infected.

[0062] According to one embodiment of the present invention, when a wound is infected, the local tissue will have an inflammatory reaction, resulting in an increase in exudate, which may contain a large amount of electrolytes, proteins and other biomolecules. Changes in these components may affect the conductivity of the wound. In addition, the activity of microorganisms may also produce some conductive metabolites, which further affect the conductivity. Therefore, when the wound is infected, the conductivity at the wound site will increase, and it can be determined whether the wound is infected based on the detection of the conductivity at the wound. The conditional function of formula (2) indicates that if the first conductivity is higher than or equal to the upper limit of the wound conductivity, the conditional function value is 1, otherwise, the conditional function value is 0, that is, if the first conductivity is higher than or equal to the upper limit of the wound conductivity, the judgment result based on the conductivity (that is, the first conductivity judgment value) is 1, indicating that the wound may be infected.

[0063] According to one embodiment of the present invention, when a wound is infected, an inflammatory reaction will occur in the local tissue, leading to pathological changes such as increased vascular permeability and leakage of plasma fluid into the interstitial space. These changes may affect the blood oxygen supply of the tissues around the wound, resulting in a decrease in blood oxygen content. Therefore, when the wound is infected, the blood oxygen content at the wound location will decrease, and whether the wound is infected can be determined based on the detection of the blood oxygen content at the wound. The conditional function of formula (3) indicates that if the first blood oxygen content is lower than or equal to the lower limit of the wound blood oxygen content, the conditional function value is 1, otherwise, the conditional function value is 0, that is, if the first blood oxygen content is lower than or equal to the lower limit of the wound blood oxygen content, the judgment result based on the blood oxygen content (that is, the first blood oxygen content judgment value) is 1, indicating that the wound may be infected.

[0064] According to one embodiment of the present invention, when a wound is infected, due to the inflammatory reaction and the reproduction of microorganisms, pathological changes such as congestion and edema will occur locally in the wound, resulting in an increase in local temperature. Therefore, when the wound is infected, the temperature at the wound location will increase, and whether the wound is infected can be determined based on the detection of the temperature at the wound. The conditional function of formula (4) indicates that if the first temperature is higher than or equal to the upper limit of the wound temperature, the conditional function value is 1, otherwise, the conditional function value is 0, that is, if the first temperature is higher than or equal to the upper limit of the wound temperature, the judgment result based on the temperature (i.e., the first temperature judgment value) is 1, indicating that the wound may be infected.

[0065] According to an embodiment of the present invention, the above judgment results based on multiple physiological indicators are obtained, and the same or different weights can be assigned to each judgment result, and each judgment result is weighted and summed by formula (5) to obtain a wound infection judgment value. The preset weight can be set by an expert based on experience, and the present invention does not limit the specific value of the preset weight. A first preset threshold value can be set, for example, 0.5 or 0.6. If the wound infection judgment value is greater than or equal to the first preset threshold value, wound infection is determined, that is, based on the four judgment results, it is determined that the probability of wound infection is high, which is higher than or equal to the first preset threshold value, and the wound infection is determined.

[0066] In this way, based on the changing patterns of conductivity, pH value, blood oxygen content and temperature during wound infection, multiple conditional functions can be set to obtain judgment values ​​of the above multiple aspects, and then the judgment value of wound infection can be obtained by combining the judgment values ​​of multiple aspects, thereby improving the accuracy and objectivity of judging wound infection.

[0067] According to one embodiment of the present invention, determining whether a wound is healing according to a first conductivity, a first pH value, a first blood oxygen content, a first temperature, a second conductivity, a second pH value, a second blood oxygen content, a second temperature, and a second humidity includes: determining a second conductivity judgment value J according to formula (6), formula (7), formula (8), formula (9), and formula (10): C,2 , the second pH value judgment value J pH,2 , the second blood oxygen content judgment value J O,2 , the second temperature judgment value J T,2 and the second humidity judgment value J H,2 ,

[0068] J C,2 =if(C1≥C2,1,0) (6)

[0069] J pH,2 =if(pH1≥pH2,1,0) (7)

[0070] J O,2 =if(O1≤O2,1,0) (8)

[0071] J T,2 =if(T1≥T2,1,0) (9)

[0072] J H,2 =if(H min ≤H2≤H max ,1,0) (10)

[0073] Wherein, C2 is the second conductivity, pH2 is the second pH value, O2 is the second blood oxygen content, T2 is the second temperature, H2 is the second humidity, H maxis the maximum humidity, H min is the minimum humidity value; the wound healing judgment value J is determined according to formula (11) CU ,

[0074] J CU =β1J C,2 +β2J pH,2 +β3J O,2 +β4J T,2 +β5J H,2 (11)

[0075] Among them, β1, β2, β3, β4 and β5 are preset weights; if the wound healing judgment value is greater than or equal to the second preset threshold, it is determined that the wound is healing.

[0076] According to one embodiment of the present invention, as the wound heals, the exudate decreases, the microbial activity weakens, and the conductivity may decrease accordingly. Therefore, it is possible to judge whether the wound is healing based on the change in conductivity. The conditional function of formula (6) indicates that if the second conductivity is lower than or equal to the first conductivity, it means that the conductivity at the wound is decreasing and the wound is healing, and the conditional function value is 1, otherwise it is 0. That is, if the second conductivity is lower than or equal to the first conductivity, the judgment result based on the conductivity (i.e., the second conductivity judgment value) is 1, indicating that the wound is healing.

[0077] According to one embodiment of the present invention, a suitable pH value helps to maintain the balance of the wound microenvironment and promote cell regeneration and repair. During the wound healing process, the pH value usually gradually tends to be neutral or slightly acidic. The conditional function of formula (7) indicates that if the second pH value is lower than or equal to the first pH value, it means that the pH value at the wound is decreasing and the wound is healing, then the conditional function value is 1, otherwise it is 0. That is, if the second pH value is lower than or equal to the first pH value, the judgment result based on the pH value (i.e., the second pH value judgment value) is 1, indicating that the wound is healing.

[0078] According to one embodiment of the present invention, the local blood oxygen level of the wound reflects the oxygenation state of the wound tissue. Adequate blood oxygen supply is important for wound healing. Therefore, during the healing process of the wound, the blood oxygen content at the wound will increase. The conditional function of formula (8) indicates that if the second blood oxygen content is higher than or equal to the first blood oxygen content, it means that the blood oxygen content at the wound is increasing and the wound is healing, then the conditional function value is 1, otherwise it is 0. That is, if the second blood oxygen content is higher than or equal to the first blood oxygen content, the judgment result based on the blood oxygen content (i.e., the second blood oxygen content judgment value) is 1, indicating that the wound is healing.

[0079] According to one embodiment of the present invention, the local temperature change of the wound may reflect the inflammatory response and blood circulation status of the wound. During the wound healing process, the temperature at the wound is lower than the temperature at the initial stage of wound formation, and the blood circulation gradually returns to normal. The conditional function of formula (9) indicates that if the second temperature is lower than or equal to the first temperature, it means that the temperature at the wound is decreasing and the wound is healing, and the conditional function value is 1, otherwise it is 0. That is, if the second temperature is lower than or equal to the first temperature, the judgment result based on temperature (i.e., the second temperature judgment value) is 1, indicating that the wound is healing.

[0080] According to one embodiment of the present invention, the humidity of the wound plays an important role in keeping the wound moist and promoting healing. Appropriate humidity helps to maintain the stability of the wound microenvironment and promote cell regeneration and repair. Therefore, during the wound healing process, the tissue near the wound will regulate the blood circulation near the wound so that the humidity at the wound is maintained at an appropriate level. The conditional function of formula (10) indicates that if the second humidity is maintained between the maximum humidity and the minimum humidity, it means that the humidity at the wound is appropriate and conducive to wound healing, then the conditional function value is 1, otherwise it is 0. That is, if the second humidity is maintained between the maximum humidity and the minimum humidity, the judgment result based on humidity (i.e., the second humidity judgment value) is 1, indicating that the wound is healing.

[0081] According to one embodiment of the present invention, the above judgment results based on multiple physiological indicators are obtained, and the same or different weights can be assigned to each judgment result, and each judgment result is weighted and summed by formula (11) to obtain a wound healing judgment value. The preset weight can be set by an expert based on experience, and the present invention does not limit the specific value of the preset weight. A second preset threshold value can be set, for example, 0.5 or 0.6. If the wound healing judgment value is greater than or equal to the second preset threshold value, it is determined that the wound is healing, that is, based on the five judgment results, it is determined that the probability of the wound healing is high, which is higher than or equal to the second preset threshold value, and it is determined that the wound is healing.

[0082] In this way, based on the changing patterns of conductivity, pH value, blood oxygen content, temperature and humidity when the wound is healing, multiple conditional functions can be set to obtain judgment values ​​of the above multiple aspects, and then the wound healing judgment value can be obtained by combining the judgment values ​​of multiple aspects, thereby improving the accuracy and objectivity of judging whether the wound is healing.

[0083] According to one embodiment of the present invention, the drug delivery flow rate of the drug delivery component can be determined based on the physiological indicator data obtained in each detection. For example, the physiological indicator data can be detected once a day by the sensor component, and the recovery status of the wound can be determined based on the physiological indicator data, thereby determining the drug demand and performing precise drug delivery.

[0084] According to one embodiment of the present invention, determining the drug delivery flow rate of the drug delivery component according to the physiological indicator data includes: determining the drug delivery flow rate F of the drug delivery component according to formula (12),

[0085]

[0086] Among them, pH nor is the normal pH value of the skin when it is not injured, C nor is the normal conductivity of the skin when it is not injured, F max is the maximum drug delivery flow rate of the drug delivery component, max(*) is the maximum value function, and is the logical operator of "and".

[0087] According to one embodiment of the present invention, the conditional function of formula (12) indicates that when the condition In the case of Otherwise, F max .in, pH th,max Indicates that the average of the first pH value and the second pH value does not exceed the upper limit of the wound pH value, It indicates that the average of the first conductivity and the second conductivity does not exceed the upper limit of the wound conductivity. Both pH and conductivity may change when a wound occurs on the skin. For example, the conductivity and pH may be affected by the increase in exudate near the wound, and the change in conductivity and pH relative to the conductivity and pH of the normal skin surface may reflect the severity of the wound and the amount of medication required by the wound. If the above conditions are met, it means that the average pH level of the wound has not reached the infection level during the detection period, and the average conductivity level has not reached the infection level. The severity and the amount of medication required may be positively correlated with the change in conductivity and pH relative to the conductivity and pH of the normal skin surface. The ratio of the difference between the average pH value of the wound during the detection period and the normal pH value of the skin to the difference between the upper limit of the pH value of the wound and the normal pH value of the skin can be used to indicate the severity of the wound represented by the pH value of the wound and the degree of need for medication when the pH value has not reached the infection level. The ratio of the difference between the average level of wound conductivity during the detection cycle and the normal conductivity of the skin to the difference between the upper limit of wound conductivity and the normal conductivity of the skin can be used to indicate the severity of the wound indicated by the wound conductivity and the degree of demand for drugs by the wound when the conductivity has not reached the infection level. The maximum value of the drug demand determined by the above two methods can be selected as the actual drug demand of the wound, so as to meet the wound's demand for drugs to the greatest extent, and the actual drug demand is multiplied by the maximum drug delivery flow rate to obtain the actual drug demand flow rate when the wound has not reached the infection level, which is also the drug delivery flow rate of the drug delivery component. If the above conditions are not met, that is, when the wound reaches the infection level, the maximum drug delivery flow rate of the drug delivery component is directly used as the drug delivery flow rate of the drug delivery component.

[0088] In this way, the severity of the wound and the degree of need for medication can be indicated by the change in the measured conductivity and pH value of the wound relative to the conductivity and pH value of the normal skin surface, and the maximum value of the wound's need for medication determined based on conductivity and the wound's need for medication determined based on pH value can be used as the actual drug demand, thereby meeting the wound's need for medication to the greatest extent, and thus obtaining an accurate drug delivery flow rate, achieving precise drug delivery to the wound, and helping the wound to heal.

[0089] According to one embodiment of the present invention, in addition to administering medication to wounds to promote wound healing, a microcurrent generator can also generate mild low-frequency current stimulation, which penetrates the skin tissue in the form of electric waves and directly reaches the dermis, stimulating the electromagnetic field of the human body and promoting the production of ATP (ATP is the abbreviation of adenosine triphosphate, an unstable high-energy compound composed of 1 molecule of adenine, 1 molecule of ribose and 3 molecules of phosphate groups. It releases a large amount of energy when hydrolyzed and is the most direct energy source in the body), thereby promoting collagen production, having a cosmetic effect on skin tissue, and strengthening cell repair. The microcurrent generator can transmit low-frequency current stimulation (i.e., microcurrent stimulation signal) to the skin tissue through electrodes.

[0090] According to one embodiment of the present invention, whether the wound is healing can be determined based on the wound information. If the wound is healing, the wound healing can be promoted through a micro-current stimulation signal to increase the healing speed.

[0091] According to one embodiment of the present invention, the frequency of the microcurrent stimulation signal may be a preset frequency, and the first current amplitude of the microcurrent stimulation signal may be determined based on physiological indicator data. For example, the severity of the wound may be judged based on the physiological indicator data, thereby determining the degree of need for microcurrent stimulation signal-assisted recovery, and then determining the first current amplitude.

[0092] According to one embodiment of the present invention, if the wound is healing, the first current amplitude of the microcurrent stimulation signal is determined according to the physiological indicator data, including: determining the first current amplitude A1 of the microcurrent stimulation signal according to formula (13),

[0093]

[0094] Among them, O nor A is the normal blood oxygen content in an uninjured condition. 1,max is the maximum current amplitude of the microcurrent generator.

[0095] According to one embodiment of the present invention, the conditional function of formula (13) indicates that when the condition In the case of Otherwise and The meaning of is as described above and will not be repeated here. Indicates that the average of the first blood oxygen content and the second blood oxygen content is not lower than the lower limit of the wound blood oxygen content. The pH value, conductivity and blood oxygen content can all change when the wound is healing. For example, because the wound is healing, the exudate near the wound decreases, the conductivity decreases, the pH value decreases, and the blood oxygen content increases. Therefore, the pH value, conductivity and blood oxygen content can reflect the degree of recovery of the wound, and can also reflect the degree of need for the wound to assist in recovery by microcurrent stimulation signals. If the above conditions are met, it means that during the detection period, the average pH value of the wound has not reached the infection level, the average conductivity has not reached the infection level, and the average blood oxygen content has not reached the infection level. The degree of need for the wound to assist in recovery by microcurrent stimulation signals can be expressed by the relative changes in conductivity, pH and blood oxygen content relative to the conductivity, pH and blood oxygen content of the normal skin surface. and The meaning of is as described above and will not be repeated here. It indicates the relative gap between the average level of blood oxygen content at the wound during the detection period and the normal blood oxygen content, which can indicate the severity of the wound and the degree of need for auxiliary recovery of the microcurrent stimulation signal. The maximum value of the degree of need for auxiliary recovery of the microcurrent stimulation signal determined in the three ways can be selected as the actual degree of need for auxiliary recovery of the microcurrent stimulation signal, and then multiplied by the maximum current amplitude of the microcurrent generator as the intensity of the microcurrent stimulation signal that matches the actual degree of need, that is, the first current amplitude, so as to meet the recovery needs of the wound to the greatest extent. If the above conditions are not met, that is, when the wound reaches the level of infection, the maximum current amplitude is directly used as the intensity of the microcurrent stimulation signal to stimulate the tissue around the wound to the greatest extent, thereby helping the wound to heal.

[0096] In this way, the severity of the wound and the need for microcurrent stimulation signals for auxiliary recovery can be expressed by the changes in the wound's actual measured conductivity, pH value and blood oxygen content relative to the conductivity, pH value and blood oxygen content of the normal skin surface. The maximum value of the degree of need calculated by the three methods is used as the actual need for microcurrent stimulation signals for auxiliary recovery, thereby meeting the wound's need for auxiliary recovery to the greatest extent, and then obtaining the accurate intensity of the microcurrent stimulation signal, which can achieve precise stimulation of the wound tissue and help wound healing.

[0097] According to one embodiment of the present invention, whether the wound is infected can be determined based on the wound information. If the wound is not infected, a pulse stimulation signal is used to further stimulate the skin to implement short and strong current stimulation, increase vascular permeability, help blood vessels transport white blood cells and oxygen to the wound, and accelerate wound healing. In addition, a pulse stimulation signal with constantly changing intensity and frequency can be used to stimulate the skin to avoid the body's adaptability and tolerance, thereby improving the stimulation effect. If the wound is infected, the pulse stimulation signal is not used for stimulation to avoid aggravating the patient's pain.

[0098] According to one embodiment of the present invention, if the wound is not infected, the second current amplitude and the second current frequency of the pulse stimulation signal are determined according to the physiological indicator data, including: obtaining the value range of the second current amplitude A2 and the second current frequency f2 according to formulas (14) and (15),

[0099]

[0100]

[0101] Among them, A 2,max is the maximum current amplitude of the electric pulse generator, f 2,max is the maximum frequency of the electric pulse generator; according to formula (16), the replacement time interval Δt2 of the second current amplitude and the second current frequency is determined,

[0102]

[0103] Among them, Δt p The stimulation duration is preset; within the value range of the second current amplitude and the second current frequency, the second current amplitude and the second current frequency are selected, and the replacement time interval is determined according to the selected second current amplitude and the second current frequency; when the duration of the pulse stimulation signal generated by using the selected second current amplitude and the second current frequency reaches the replacement time interval, the second current amplitude and the second current frequency are selected again within the value range of the second current amplitude and the second current frequency, and the replacement time interval is recalculated.

[0104] According to one embodiment of the present invention, the pulse stimulation signal can stimulate the skin, increase blood vessel permeability, help blood vessels transport white blood cells and oxygen to the wound, and increase the blood oxygen content near the wound. Therefore, the blood oxygen content can be used to describe the intensity requirement of the wound for the pulse stimulation signal. In addition, in order to meet the intensity requirement of the wound for the pulse stimulation signal, As a minimum ratio, that is, As the lower limit of the second current amplitude, As the lower limit of the second current frequency, the second current amplitude can be arbitrarily selected within the value range set by formula (14), and the second current frequency can be arbitrarily selected within the value range set by formula (15), so as to ensure that the minimum intensity of the pulse stimulation signal can meet the intensity requirement of the pulse stimulation signal of the wound. In addition, the method of selecting the second current amplitude and the second current frequency within the value range can also continuously change the stimulation intensity of the pulse stimulation signal, avoid the body's adaptability and tolerance, and maintain a good stimulation effect.

[0105] According to an embodiment of the present invention, the duration of each stimulation by a pulse stimulation signal can be set by formula (16), that is, each time the stimulation duration is reached, the second current amplitude and the second current frequency can be reselected within the above value range to avoid the body's adaptability and tolerance. Therefore, the duration of each stimulation by a pulse stimulation signal is the replacement time interval of the second current amplitude and the second current frequency. Wherein, f 2,max Δt p It can represent the number of stimulations performed at the maximum frequency within the preset stimulation duration. Therefore, A 2,max f 2,max Δt p is the total stimulation effect of using the maximum frequency and the maximum current amplitude for stimulation within the preset stimulation duration, so that the total stimulation effect of each stimulation can be the same, that is, each time the second current amplitude and the second current frequency are changed, the same total stimulation effect can be achieved, so A2f2Δt2=A 2,max f 2,max Δt p Therefore, after selecting the second current amplitude and the second current frequency, the duration of stimulation is as shown in formula (16). After reaching the stimulation duration, the second current replication and the second current frequency can be reselected to avoid collective adaptation and tolerance and maintain a good stimulation effect.

[0106] In this way, the value range of the second current amplitude and the second current frequency can be set, and the minimum intensity of the pulse stimulation signal can meet the intensity requirement of the wound for the pulse stimulation signal, so that the pulse stimulation signal can achieve the effect of helping the wound heal. In addition, the duration of the stimulation can be set in the same way as the total stimulation effect, and the second current amplitude and the second current frequency can be selected again within the value range after the duration of the stimulation is reached, which can avoid collective adaptability and tolerance, maintain a good stimulation effect, and help wound healing.

[0107] According to one embodiment of the present invention, the intermediate circuit structure can send the drug administration flow rate to the drug administration component, send the first current amplitude to the microcurrent generator, and send the second current amplitude, the second current frequency and the replacement time interval to the electric pulse generator. For example, control instructions are generated according to the drug administration flow rate, the first current amplitude, the second current amplitude, the second current frequency and the replacement time interval, and sent to the drug administration component, the microcurrent generator and the electric pulse generator respectively, so as to control the drug administration component, the microcurrent generator and the electric pulse generator to work, so as to help wound healing and improve the recovery effect.

[0108] According to the Jiayu smart bandage based on microcurrent and electric pulses of the embodiment of the present invention, the recovery status of the wound can be timely understood through the sensor component of the internal contact structure, and a drug storage structure is provided in the external protective structure, and the drug can be administered through the drug administration component of the internal contact structure, so there is no need to change the dressing frequently, and there is no need to disassemble the bandage to cause secondary damage to the wound. Furthermore, the intermediate circuit structure can also control the drug administration structure to accurately administer the drug based on the recovery status of the wound detected by the sensor component, so that the dosage meets the demand of the wound for the drug, and can stimulate the tissue at the wound with microcurrent and electric pulses based on the detected physiological index data, thereby stimulating the tissue at the wound, enhancing the cell repair effect, and improving the recovery speed. When judging whether the wound is infected, multiple conditional functions can be set based on the change rules of conductivity, pH value, blood oxygen content and temperature when the wound is infected, so as to obtain the judgment values ​​of the above multiple aspects, and then the judgment value of wound infection is obtained by combining the judgment values ​​of multiple aspects, thereby improving the accuracy and objectivity of judging wound infection. When judging whether a wound is healing, conditional functions in multiple aspects can be set based on the changing patterns of conductivity, pH value, blood oxygen content, temperature and humidity when the wound is healing, so as to obtain the judgment values ​​in the above multiple aspects, and then obtain the wound healing judgment value by combining the judgment values ​​in multiple aspects, so as to improve the accuracy and objectivity of judging whether the wound is healing. When determining the drug delivery flow rate, the severity of the wound and the degree of demand for drugs can be expressed by the change in the measured conductivity and pH value of the wound relative to the conductivity and pH value of the normal skin surface, and the maximum value of the degree of demand for drugs determined by the conductivity and the degree of demand for drugs determined by the pH value can be used as the actual drug demand, so as to meet the wound's demand for drugs to the greatest extent, and then obtain an accurate drug delivery flow rate, which can achieve precise drug delivery to the wound and help the wound heal. When setting the microcurrent stimulation signal, the severity of the wound and the degree of need for auxiliary recovery of the microcurrent stimulation signal can be indicated by the change in the measured conductivity, pH value and blood oxygen content of the wound relative to the conductivity, pH value and blood oxygen content of the normal skin surface, and the maximum value of the degree of need calculated by three methods is used as the actual degree of need for auxiliary recovery of the microcurrent stimulation signal, so as to meet the needs of the wound for auxiliary recovery to the greatest extent, and then obtain the accurate strength of the microcurrent stimulation signal, which can achieve precise stimulation of the tissue at the wound and help the wound heal. When setting the electric pulse generator, the value range of the second current amplitude and the second current frequency can be set, and it is ensured that the minimum intensity of the pulse stimulation signal can meet the wound's intensity requirement for the pulse stimulation signal, so that the pulse stimulation signal can achieve the effect of helping the wound heal.In addition, the duration of stimulation can be set in the same way as the overall stimulation effect, and the second current amplitude and the second current frequency can be selected within the value range again after the stimulation duration is reached. This can avoid collective adaptability and tolerance, maintain a good stimulation effect, and help wound healing.

[0109] Figure 2 A flow chart of a control method of the Jiayu smart bandage based on microcurrent and electric pulse according to an embodiment of the present invention is exemplarily shown, wherein the method is used for the intermediate circuit structure of the Jiayu smart bandage based on microcurrent and electric pulse, and comprises:

[0110] Receiving physiological indicator data detected by the sensor component;

[0111] Determining wound information according to the physiological indicator data;

[0112] Determining the drug delivery flow rate of the drug delivery component according to the physiological indicator data;

[0113] determining whether the wound is healing according to the wound information;

[0114] If the wound is healing, determining a first current amplitude of the microcurrent stimulation signal according to the physiological indicator data;

[0115] determining whether the wound is infected according to the wound information;

[0116] If the wound is not infected, determining a second current amplitude and a second current frequency of the pulse stimulation signal according to the physiological indicator data;

[0117] The drug administration flow rate is sent to the drug administration component, the first current amplitude is sent to the microcurrent generator, and the second current amplitude and the second current frequency are sent to the electric pulse generator.

[0118] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

[0119] 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A Jiayu smart bandage based on microcurrent and electric pulse, characterized in that: include: External protection structure, intermediate circuit structure and internal contact structure; The external protection structure includes a shell, an elastic band and a drug storage structure, wherein the shell is used to protect the intermediate circuit structure and the internal contact structure, the elastic band is used to contact and fix the smart bandage to the wound, and the drug storage structure is used to store drugs; The internal contact structure includes a sensor component, a drug delivery component, an electric pulse generator and a micro-current generator, wherein the sensor component is used to detect physiological index data at the wound position, the drug delivery component is used to absorb the drug stored in the drug storage structure and release the drug to the wound, the electric pulse generator is used to generate a pulse stimulation signal, and the micro-current generator is used to generate a micro-current stimulation signal; The intermediate circuit structure is used for: Receiving physiological indicator data detected by the sensor component; Determining wound information according to the physiological indicator data; Determining the drug delivery flow rate of the drug delivery component according to the physiological indicator data; determining whether the wound is healing according to the wound information; If the wound is healing, determining a first current amplitude of the microcurrent stimulation signal according to the physiological indicator data; determining whether the wound is infected according to the wound information; If the wound is not infected, determining a second current amplitude and a second current frequency of the pulse stimulation signal according to the physiological indicator data; Sending the drug administration flow rate to the drug administration component, sending the first current amplitude to the microcurrent generator, and sending the second current amplitude and the second current frequency to the electric pulse generator; Determining wound information according to the physiological indicator data includes: At the beginning and end of the detection cycle, physiological index data are obtained respectively; Determine a first conductivity, a first pH value, a first blood oxygen content, and a first temperature at the wound location according to the physiological indicator data at the start of the detection cycle, and determine a second conductivity, a second pH value, a second blood oxygen content, a second temperature, and a second humidity at the wound location according to the physiological indicator data at the end of the detection cycle; determining whether the wound is infected according to the first conductivity, the first pH value, the first blood oxygen content, and the first temperature; determining whether the wound is healing according to the first conductivity, the first pH value, the first blood oxygen content, the first temperature, the second conductivity, the second pH value, the second blood oxygen content, the second temperature and the second humidity; Obtain information about the wound based on whether it is infected and whether the wound is healing; Determining whether the wound is infected according to the first conductivity, the first pH value, the first blood oxygen content, and the first temperature includes: Set the upper limit of wound pH value, wound conductivity, wound blood oxygen content and wound temperature; determining whether the wound is infected according to the first conductivity, the first pH value, the first blood oxygen content, the first temperature, the upper limit of the wound pH value, the upper limit of the wound conductivity, the lower limit of the wound blood oxygen content, and the upper limit of the wound temperature; Determining whether the wound is infected according to the first conductivity, the first pH value, the first blood oxygen content, the first temperature, the upper limit of the wound pH value, the upper limit of the wound conductivity, the lower limit of the wound blood oxygen content, and the upper limit of the wound temperature includes: According to the formula ， ， ， ， Determine the first conductivity judgment value , the first pH value judgment value , the first blood oxygen content judgment value and the first temperature judgment value ,in, is the first conductivity, is the first pH value, is the first blood oxygen content, is the first temperature, is the upper limit of wound conductivity, The upper limit of wound pH. The lower limit of blood oxygen content in the wound. is the upper limit of wound temperature, is the conditional function; According to the formula ， Determine wound infection assessment value ,in, , , and is the preset weight; If the wound infection judgment value is greater than or equal to the first preset threshold, determining that the wound is infected; Determining whether the wound is healing according to the first conductivity, the first pH value, the first blood oxygen content, the first temperature, the second conductivity, the second pH value, the second blood oxygen content, the second temperature and the second humidity, including: According to the formula ， ， ， ， ， Determine the second conductivity judgment value , the second pH value judgment value , the second blood oxygen content judgment value , the second temperature judgment value and the second humidity judgment value ,in, is the second conductivity, is the second pH value, is the second blood oxygen content, is the second temperature, is the second humidity, is the maximum humidity, is the minimum humidity; According to the formula ， Determine wound healing judgment value ,in, , , , and is the preset weight; If the wound healing judgment value is greater than or equal to the second preset threshold, it is determined that the wound is healing; Determining the drug delivery flow rate of the drug delivery component according to the physiological indicator data includes: According to the formula ， Determine the drug delivery flow rate F of the drug delivery assembly, where: is the normal pH value of the skin when it is not injured. is the normal conductivity of the skin when it is not injured, is the maximum drug delivery flow rate of the drug delivery component, is the maximum value function, and is the logical operator of "and".

2. The Jiayu smart bandage based on microcurrent and electric pulse according to claim 1 is characterized in that: If the wound is healing, determining a first current amplitude of the microcurrent stimulation signal according to the physiological indicator data includes: According to the formula ， Determine the first current amplitude of the microcurrent stimulation signal ,in, is the normal blood oxygen content in an uninjured condition. is the maximum current amplitude of the microcurrent generator.

3. The Jiayu smart bandage based on microcurrent and electric pulse according to claim 2 is characterized in that: If the wound is not infected, determining a second current amplitude and a second current frequency of the pulse stimulation signal according to the physiological indicator data, including: According to the formula ， ， Get the second current amplitude and the second current frequency The value range of is, is the maximum current amplitude of the electric pulse generator, is the maximum frequency of the electric pulse generator; According to the formula ， Determine the replacement time interval of the second current amplitude and the second current frequency ,in, To preset the stimulation duration; Selecting the second current amplitude and the second current frequency within the value range of the second current amplitude and the second current frequency, and determining the replacement time interval according to the selected second current amplitude and the second current frequency; When the duration of the pulse stimulation signal generated by using the selected second current amplitude and second current frequency reaches the replacement time interval, the second current amplitude and second current frequency are reselected within the value range of the second current amplitude and the second current frequency, and the replacement time interval is recalculated.

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