Accurate adjustment method and system for negative pressure of chronic wound surface

Abstract

The invention relates to a chronic wound surface negative pressure precise adjusting method and system. The method comprises the steps that S1, a system target negative pressure value and treatment time are set; s2, whether an intermittent mode is set or not is selected; s3, if yes, setting an intermittent negative pressure value and intermittent time; s4, the main control unit carries out algorithm operation according to data detected by the second pressure sensor and controls the negative pressure pump to work, so that the system reaches the target negative pressure value; s5, after the treatment time is up, the main control unit carries out algorithm operation to control an electronic air escape valve to release pressure, so that the system reaches a set intermittent negative pressure value; s6, after the set intermittent time is reached, the main control unit controls the electronic air escape valve to be closed; s7, repeating the steps S4-S6; and S8, if not, the system operates at the set target negative pressure value. Compared with intermittent negative pressure in the prior art, the problem that natural leakage has uncertainty is solved, the electronic air escape valve is adopted for rapid pressure relief to replace natural leakage, and the intermittent treatment effect is improved.

Description

Technical Field

[0001] The present application relates to the field of medical device technology, and specifically to a method and system for accurately regulating negative pressure on chronic wounds. Background Art

[0002] Negative pressure wound treatment equipment mainly uses negative pressure as a suction source to continuously or intermittently absorb the fluid around the wound and store the fluid (exudate) in a storage tank, which can effectively increase the blood flow of the wound and help reduce tissue edema and promote wound healing. It has a good effect in treating soft tissue contusions and lacerations of the limbs, diabetic foot and carbuncle, deep pressure sores, skin grafting and plastic surgery.

[0003] Currently, negative pressure-assisted wound healing treatment is generally divided into two modes: one is continuous negative pressure treatment and the other is intermittent negative pressure treatment. The so-called continuous negative pressure treatment is 24-hour uninterrupted negative pressure suction treatment. Continuous negative pressure treatment will cause continuous negative pressure on the wound, which will damage the tissues around the wound and cause obvious pain to the patient.

[0004] The intermittent mode is achieved by setting fixed negative pressure suction time and intermittent time. When the liquid leaks naturally during the fixed negative pressure suction time, natural leakage is uncertain. When the leakage speed is too slow, the intermittent time is reached before the liquid has completely leaked out, and the effect of intermittent treatment cannot be achieved. Summary of the invention

[0005] The purpose of the present invention is to provide a method and system for accurately adjusting negative pressure on chronic wounds to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, on the one hand, the present invention provides the following technical solutions:

[0007] A method for accurately adjusting negative pressure on a chronic wound surface comprises the following steps:

[0008] S1: Set the system target negative pressure value and treatment time;

[0009] S2: Choose whether to set the intermittent mode;

[0010] S3: Select Yes and set the intermittent negative pressure value and intermittent time;

[0011] S4: The main control unit performs an algorithm operation according to the data detected by the second pressure sensor to control the negative pressure pump to work so that the system reaches the target negative pressure value;

[0012] S5: When the treatment time is reached, the main control unit performs an algorithm to control the electronic air release valve to release pressure, so that the system reaches the set intermittent negative pressure value;

[0013] S6: When the set intermittent time is reached, the main control unit controls the electronic air release valve to close;

[0014] S7: Repeat the above steps S4-S6;

[0015] S8: Select No, the system will operate at the set target negative pressure value.

[0016] In one embodiment, the first pressure sensor reads the pressure value at the wound surface of the human body and transmits it to the main control unit.

[0017] In one embodiment, when the pressure value of the first pressure sensor and the pressure value of the second pressure sensor received by the main control unit are both less than the target negative pressure value of the system, it is determined that the system is in a leakage state;

[0018] When the pressure value of the first pressure sensor received by the main control unit is less than the system target negative pressure value and the pressure value of the second pressure sensor is greater than the system target negative pressure value, it is determined that the system is in a blocked state.

[0019] On the other hand, the present invention also provides a system for accurately regulating negative pressure on a chronic wound, which is used to implement a method for accurately regulating negative pressure on a chronic wound, and includes a main control unit, a power control unit, a first pressure sensor, a second pressure sensor, a negative pressure pump, an electronic air release valve, and a liquid storage tank;

[0020] The main control unit is connected to the power control unit;

[0021] The first pressure sensor, the second pressure sensor, the negative pressure pump and the electronic air release valve are electrically connected to the main control unit;

[0022] The liquid storage tank is provided with a first port and a second port, the first pressure sensor is connected to the first port of the liquid storage tank through pipeline 1, and the second pressure sensor, the negative pressure pump and the electronic air release valve are connected to the second port of the liquid storage tank through a four-way pipe fitting respectively.

[0023] In one embodiment, a gyroscope is further included, and the gyroscope is electrically connected to the main control unit.

[0024] In one embodiment, the main control unit is provided with an alarm unit and a display unit.

[0025] In one embodiment, a rechargeable battery connected to the power control unit is also included.

[0026] In this system, there are two modes: intermittent negative pressure therapy and fixed negative pressure therapy. This method mainly describes the operation steps S1-S7 in the intermittent negative pressure therapy mode, and step S8 is not repeated.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] Compared with the intermittent negative pressure in the prior art, the problem of uncertainty in natural leakage is solved. If the natural leakage speed is too slow, the intermittent working time will be up and the system will not drop to the vicinity of the intermittent negative pressure value, and the effect of intermittent treatment cannot be achieved. The method uses an electronic relief valve for rapid pressure relief to replace natural leakage. The operation of the electronic relief valve can make the system target negative pressure value quickly approach the intermittent negative pressure value, thereby improving the effect of intermittent treatment.

[0029] Compared with continuous fixed pressure, this method and system for accurately regulating negative pressure on chronic wounds can stimulate wound tissue more gently and promote cell proliferation and differentiation by simulating natural physiological pressure changes. This dynamic stimulation helps to accelerate the formation of granulation tissue and enhance the repair and regeneration ability of tissues. Especially when treating deep wounds or chronic wounds, the intermittent mode can show more significant therapeutic effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is the workflow diagram of this application;

[0031] Figure 2 This is the block diagram of the PID control algorithm for this application;

[0032] Figure 3 This is a schematic diagram of the structure of the chronic wound negative pressure precise regulation system of this application.

[0033] Reference numerals:

[0034] 1. Main control unit; 2. Power control unit; 3. First pressure sensor; 4. Second pressure sensor; 5. Negative pressure pump; 6. Electronic air release valve; 7. Liquid storage tank; 8. Alarm unit; 9. Display unit; 10. Gyroscope; 21. Rechargeable battery; 31. Pipeline 1; 32. Four-way pipe fitting; 71. First port; 72. Second port. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0036] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate quantity restrictions, but indicate the existence of at least one. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly.

[0037] The following is combined with Figure 1 -Attached Figure 3 The embodiments of the present application are described in detail.

[0038] like Figure 1 As shown, in an embodiment of the present invention, a method for accurately adjusting negative pressure on a chronic wound is provided, comprising the following steps:

[0039] S1: Set the system target negative pressure value and treatment time;

[0040] S2: Choose whether to set the intermittent mode;

[0041] S3: Select Yes and set the intermittent negative pressure value and intermittent time;

[0042] S4: The main control unit performs an algorithm operation according to the data detected by the second pressure sensor to control the negative pressure pump to work so that the system reaches the target negative pressure value;

[0043] S5: When the treatment time is reached, the main control unit performs an algorithm to control the electronic air release valve to release pressure, so that the system reaches the set intermittent negative pressure value;

[0044] S6: When the set intermittent time is reached, the main control unit controls the electronic air release valve to close;

[0045] S7: Repeat the above steps S4-S6;

[0046] S8: Select No, the system will operate at the set target negative pressure value.

[0047] In this system, there are two modes: intermittent negative pressure therapy and fixed negative pressure therapy. This method mainly describes the operation steps S1-S7 in the intermittent negative pressure therapy mode, and step S8 is not repeated.

[0048] Compared with the intermittent negative pressure in the prior art, the uncertainty problem of natural leakage is solved. If the natural leakage speed is too slow, the intermittent working time will be up and the system will not drop to the vicinity of the intermittent negative pressure value, and the effect of intermittent treatment cannot be achieved. This method uses an electronic air relief valve to quickly release pressure instead of natural leakage, thereby improving the effect of intermittent treatment.

[0049] Compared with continuous fixed pressure, this method and system for accurately regulating negative pressure on chronic wounds can stimulate wound tissue more gently and promote cell proliferation and differentiation by simulating natural physiological pressure changes. This dynamic stimulation helps to accelerate the formation of granulation tissue and enhance the repair and regeneration ability of tissues. Especially when treating deep wounds or chronic wounds, the intermittent mode can show more significant therapeutic effects.

[0050] In this system, there are two modes: intermittent negative pressure therapy and fixed negative pressure therapy. This method mainly describes the operating steps in the intermittent negative pressure therapy mode.

[0051] In this method, the main control unit uses PID algorithm to calculate, and adjusts the motor in the negative pressure pump through pulse width modulation PWM to control the power output of the negative pressure pump. The PID control output is calculated, and the output is determined according to the judgment. The PWM output is determined according to the PID control output. The block diagram is as follows Figure 2 shown.

[0052] The specific algorithm is as follows:

[0053] PID algorithm: PWM=Kp*e(k)+Ki*∑e(k)+Kd*[e(k)-e(k-1)]

[0054] PWM – Duty cycle of the pump.

[0055] ∑e(k)——the cumulative sum of e(k) and previous deviations; where k is 1, 2, …k;

[0056] e(k) is the error between the controller input and the set value.

[0057] e(k-1)——The error between the last controller input and the set value.

[0058] Kp——proportional coefficient.

[0059] Ki——integral time constant.

[0060] Kd——differential time constant.

[0061] P——Proportional control.

[0062] I——Integral control.

[0063] D——Differential control.

[0064] C_P——The sensor feedbacks the current pressure.

[0065] P_SET——Set pressure.

[0066] This design adopts closed-loop control and performs correction control based on the output data feedback of the second pressure sensor. When the actual negative pressure value measured deviates from the set negative pressure value, the speed deviation of the negative pressure pump is effectively corrected through the combination of three control algorithms: proportion, integration, and differential coefficient, so that the pressure reaches a stable value.

[0067] Furthermore, in the above solution, the first pressure sensor reads the pressure value at the wound surface of the human body and transmits it to the main control unit.

[0068] Further, when the pressure value of the first pressure sensor and the pressure value of the second pressure sensor received by the main control unit are both less than the target negative pressure value of the system, it is determined that the system is in a leakage state;

[0069] When the pressure value of the first pressure sensor received by the main control unit is less than the system target negative pressure value and the pressure value of the second pressure sensor is greater than the system target negative pressure value, it is determined that the system is in a blocked state.

[0070] The following is a system embodiment of the present invention, which can be used to execute a method embodiment of the present invention.

[0071] like Figure 3 As shown, it shows a chronic wound negative pressure precise regulation system provided by an exemplary embodiment of the present invention, including a main control unit 1, a power control unit 2, a first pressure sensor 3, a second pressure sensor 4, a negative pressure pump 5, an electronic air release valve 6 and a liquid storage tank 7;

[0072] The main control unit 1 is connected to the power control unit 2;

[0073] The first pressure sensor 3, the second pressure sensor 4, the negative pressure pump 5 and the electronic air release valve 6 are electrically connected to the main control unit 1;

[0074] The liquid storage tank 7 is provided with a first port 71 and a second port 72. The first pressure sensor 3 is connected to the first port 71 of the liquid storage tank 7 through a pipeline 31. The second pressure sensor 4, the negative pressure pump 5 and the electronic air release valve 6 are connected to the second port 72 of the liquid storage tank 7 through a four-way pipe fitting 32 respectively.

[0075] The intrinsic wound surface negative pressure precise regulation system accelerates the system from the target negative pressure value to the intermittent negative pressure value by setting the electronic air release valve 6, solves the instability problem of natural pressure release in the current intermittent mode, and improves the effect of intermittent treatment.

[0076] Furthermore, if Figure 3 As shown, it also includes a gyroscope 10, which is electrically connected to the main control unit 1. By setting the gyroscope 10, it can be detected whether the liquid storage tank 7 is tipped over, and the tipping information can be transmitted to the main control unit.

[0077] Furthermore, if Figure 3 As shown, the main control unit 1 is provided with an alarm unit 8 and a display unit 9. The main control unit 1 controls the alarm unit 8 and the display module 9 to generate blockage, leakage and dumping alarm information according to the data of the first pressure sensor, the second pressure sensor 4 and the gyroscope 10, and displays the system operation information, so as to facilitate the staff to find and solve the problems in time.

[0078] Furthermore, if Figure 3 As shown, a rechargeable battery 21 connected to the power control unit 2 is also included. When the power of the rechargeable battery 21 is insufficient, the power control unit 2 charges the rechargeable battery 21 through an external power adapter.

[0079] The above embodiments are used to further illustrate the present application, but the present application is not limited to these specific implementations. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be understood to be within the scope of protection of the present application.

Claims

1. A method for accurately adjusting negative pressure on chronic wounds, characterized in that: The following steps are involved: S1: Set the system target negative pressure value and treatment time; S2: Choose whether to set the intermittent mode; S3: Select Yes and set the intermittent negative pressure value and intermittent time; S4: The main control unit performs an algorithm operation according to the data detected by the second pressure sensor to control the negative pressure pump to work so that the system reaches the target negative pressure value; S5: When the treatment time is reached, the main control unit performs an algorithm to control the electronic air release valve to release pressure, so that the system reaches the set intermittent negative pressure value; S6: After the intermittent negative pressure value is used to run for the set intermittent time, the main control unit controls the electronic air release valve to close; S7: Repeat the above steps S4-S6; S8: Select No, the system will operate at the set target negative pressure value.

2. The method for accurately adjusting negative pressure on chronic wounds according to claim 1, characterized in that: The first pressure sensor reads the pressure value at the wound surface of the human body and transmits it to the main control unit.

3. The method for accurately adjusting negative pressure on chronic wounds according to claim 2, characterized in that: When the pressure value of the first pressure sensor and the pressure value of the second pressure sensor received by the main control unit are both less than the target negative pressure value of the system, a judgment is made that the system is in a leakage state; When the pressure value of the first pressure sensor received by the main control unit is less than the system target negative pressure value and the pressure value of the second pressure sensor is greater than the system target negative pressure value, it is determined that the system is in a blocked state.

4. A system for accurately regulating negative pressure on chronic wounds, used to implement the method for accurately regulating negative pressure on chronic wounds according to claims 1-3, characterized in that: It comprises a main control unit (1), a power control unit (2), a first pressure sensor (3), a second pressure sensor (4), a negative pressure pump (5), an electronic air release valve (6) and a liquid storage tank (7); The main control unit (1) is connected to the power control unit (2); The first pressure sensor (3), the second pressure sensor (4), the negative pressure pump (5) and the electronic air release valve (6) are electrically connected to the main control unit (1); The liquid storage tank (7) is provided with a first port (71) and a second port (72); the first pressure sensor (3) is connected to the first port (71) of the liquid storage tank (7) through a pipeline (31); the second pressure sensor (4), the negative pressure pump (5) and the electronic air release valve (6) are respectively connected to the second port (72) of the liquid storage tank (7) through a four-way pipe fitting (32).

5. The chronic wound surface negative pressure precise adjustment system according to claim 4, characterized in that: It also includes a gyroscope (10), wherein the gyroscope (10) is electrically connected to the main control unit (1).

6. The chronic wound surface negative pressure precise adjustment system according to claim 4, characterized in that: The main control unit (1) is provided with an alarm unit (8) and a display unit (9).

7. The chronic wound surface negative pressure precise adjustment system according to claim 4, characterized in that: It also includes a rechargeable battery (21) connected to the power control unit (2).

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