Miniature negative pressure wound treatment system and negative pressure treatment method

Abstract

The invention relates to the technical field of negative pressure wound therapy, and provides a miniature negative pressure wound therapy system and a negative pressure therapy method.The miniature negative pressure wound therapy system is characterized in that a negative pressure monitoring circuit and a negative pressure pump control and feedback circuit are connected with dressing through pipelines, and a power supply circuit comprises a power supply and a Buck-Boost circuit; the negative pressure monitoring circuit comprises a gas pressure sensor U4 and a signal processing circuit, the negative pressure pump control and feedback circuit comprises a negative pressure pump P6 and a driving circuit, the driving circuit is connected with the signal processing circuit through a sampling circuit, and the LED and buzzer prompting circuit adopts a scanning driving circuit; the dressing state and the working state of the negative pressure pump are fed back to the MCU control circuit through the negative pressure monitoring circuit and the negative pressure pump feedback circuit, so that the MCU control circuit dynamically adjusts the negative pressure pump, keeps the negative pressure state in a dressing cavity, enables waste liquid of human tissue to continuously permeate into the dressing and achieves waste liquid collection, the control circuit and the control process are simple, the overall structure is small, and cost is low. Carrying is convenient, and cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of negative pressure wound therapy, in particular to a micro negative pressure wound therapy system and a negative pressure therapy method. BACKGROUND

[0002] In the negative pressure wound therapy (NPWT) system, the negative pressure value at the wound site is reflected by monitoring the negative pressure value in the pipeline. Applying a certain amount of negative pressure value to the wound surface can accelerate the wound healing of the patient. Real-time adjustment of the applied negative pressure value according to the wound healing state can greatly improve the healing speed and comfort of the patient's wound during the healing process.

[0003] The existing negative pressure wound therapy system mainly detects the negative pressure value in the pipeline through a negative pressure sensor. However, the pressure value cannot be adjusted, and the system can only work at one pressure value. The monitoring is not accurate enough, the error range is large, and the negative pressure value cannot be adjusted according to the patient's own condition. During the patient's rehabilitation process, the negative pressure value that is most suitable for the patient's wound healing cannot be adjusted. Although there are adjustable negative pressure wound therapy systems in the prior art, a drainage dressing is required for waste liquid drainage, and the waste liquid is collected into the corresponding waste liquid recovery container through the waste liquid recovery pipeline. The corresponding pipeline and circuit structure of the negative pressure wound therapy system are complex, the overall structure is large, it is not suitable for carrying around, and the price is expensive, which cannot meet all the requirements of clinical use. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a micro negative pressure wound therapy system and a negative pressure therapy method to overcome the shortcomings of the prior art.

[0005] To achieve the above-mentioned purpose, the following technical solutions are adopted: A micro negative pressure wound therapy system, characterized in that it comprises a power supply circuit and an MCU control circuit, the power supply circuit and the MCU control circuit are connected with a negative pressure monitoring circuit, a negative pressure pump control and feedback circuit, a Flash storage circuit, an LED and buzzer prompting circuit, and a key triggering circuit respectively, and the negative pressure monitoring circuit and the negative pressure pump control and feedback circuit are connected with a dressing through a pipeline. The power supply circuit comprises a power supply and a Buck-Boost circuit, the negative pressure monitoring circuit comprises a gas pressure sensor U4 and a signal processing circuit, the negative pressure pump control and feedback circuit comprises a negative pressure pump P6 and a driving circuit, the driving circuit is connected with a sampling circuit, the sampling circuit is connected with the signal processing circuit, and the LED and buzzer prompting circuit adopts a scanning driving circuit.

[0006] As a further improvement of the application, the power supply circuit comprises a power input positive pole P2 and a negative pole P3, a power voltage feedback circuit R3, R4 and an anti-reverse connection protection circuit Q3, R26 are arranged between the positive pole P2 and the negative pole P3, the power voltage feedback circuit R3, R4 outputs through a feedback output terminal PA3, the output terminal of the Q3 is connected with a fuse F1, the output terminal of the fuse F1 is connected with a power control and feedback circuit Q2, Q4, R20, R21, R22, R23, R24, D2, PWR_EN in the power control and feedback circuit is a program control power output terminal, KEY_1, PB15 in the power control and feedback circuit is a key start feedback circuit, an input stage filter circuit C20, C21 and a Buck-Boost circuit are arranged between the Q4 and the negative pole P3, the Buck-Boost circuit comprises U3, R25, R27, R28, R29, R30, the Buck-Boost circuit system power output terminal is VCC, an output stage filter circuit C22, C23 is arranged between the VCC and the negative pole P3.

[0007] As a further improvement of the application, the signal processing circuit comprises a signal amplification and baseline adjustment circuit R31, R32, R34, R35, U7.1 connected with the gas pressure sensor U4, the output terminal of the U7.1 is connected with a first-order passive low-pass filter R33, C28, and the output terminal of the first-order passive low-pass filter outputs a signal through PA5.

[0008] As a further improvement of the application, the driving circuit comprises U2 and a negative pressure pump control input terminal PA10, the sampling circuit comprises R13, the signal processing circuit comprises a first-order active low-pass filter circuit R11, R14, C16, the output terminal of the first-order active low-pass filter circuit is connected with the same phase input terminal of a signal amplification circuit U7.2, R15, R16, the output terminal of the signal amplification circuit outputs a signal through PA6.

[0009] As a further improvement of the application, the LED and buzzer prompting circuit comprises an indicator lamp circuit and a buzzer circuit, the buzzer circuit comprises a buzzer BUZZER1, the BUZZER1 is connected with a buzzer control circuit R39, R40, Q5, the BUZZER1 is connected with a protection circuit D6 in parallel, the R40 is connected with a buzzer control input terminal PB6; the indicator lamp circuit selects one or more of an independent driving circuit and a scanning driving circuit; The independent driving circuit comprises a plurality of indicator lamp circuit input terminals, each indicator lamp circuit input terminal is connected with a corresponding LED indicator and a current limiting resistor; The scanning drive circuit comprises a plurality of indicator lamp circuit input ends, each of which is connected with a corresponding current limiting resistor, and each two of the indicator lamp circuit input ends are connected with an LED indicator lamp group, which selects one of a single LED indicator lamp and two LED indicator lamps in opposite directions.

[0010] As a further improvement of the application, the key trigger circuit comprises key trigger devices K1, K2, K3 and K4, which are respectively connected with pull-up resistors R53, R52, R51 and R50, and are respectively connected in parallel with anti-interference capacitors C32, C33, C34 and C35, and are respectively provided with key trigger output ends KEY_1, PA12, PA11 and PA8 between the key trigger devices and the corresponding pull-up resistors, and the key trigger output end KEY_1 is connected with the power supply circuit.

[0011] As a further improvement of the application, the MCU control circuit comprises a single-chip microcomputer U1, a reset circuit, a clock source, a power supply filter circuit and a start-up guide circuit, the reset circuit comprises R1 and C6, the clock source comprises X2, C9 and C10, the power supply filter circuit comprises L1, C8 and C4, and the start-up guide circuit comprises R2.

[0012] As a further improvement of the application, the Flash storage circuit comprises a Flash storage chip U6, and the U6 is provided with data communication interaction interfaces PA15, PB3, PB4 and PB5.

[0013] As a further improvement of the application, the negative pressure pump P6 is connected with a negative pressure pump gas pipeline, the negative pressure pump gas pipeline comprises an elbow joint connected with the negative pressure pump P6, the elbow joint is connected with a luer joint through a three-way joint, the three-way joint is connected with a gas pressure sensor U4, and the luer joint is directly connected with the dressing through a connecting pipeline.

[0014] A negative pressure wound treatment method, characterized by comprising the following steps: Step 1: power on the device, turn on the power supply circuit, and initialize the system; Step 2: the MCU control circuit collects power supply information of the power supply to ensure that the power supply is normal; Step 3: the MCU control circuit drives the Flash storage circuit to read flash information and configure running parameters; Step 4: the MCU control circuit drives the key trigger circuit to detect key triggering, and the MCU control circuit controls the LED and the buzzer according to the triggering state fed back by the key trigger circuit; Step 5: The MCU control circuit drives the negative pressure monitoring circuit to collect and feed back the negative pressure signal, and the negative pressure pump control and feedback circuit feeds back and transmits the working state parameters of the negative pressure pump, and the MCU control circuit judges the state of the negative pressure wound treatment system according to the feedback negative pressure signal and the working state parameters of the negative pressure pump; Step 6: According to the state judgment result of the negative pressure wound treatment system in step 5, the MCU control circuit drives the negative pressure pump control and feedback circuit, when the dressing is under pressure, the negative pressure pump P6 starts to increase the negative pressure, when the dressing is over pressure, the negative pressure pump P6 stops, and the system automatically bleeds, thereby dynamically adjusting the negative pressure value; Step 7: After the treatment is completed, the MCU control circuit controls the power supply circuit to disconnect the power supply, and the system is shut down.

[0015] The beneficial effects of the present application are: 1. The present application provides a wound treatment system with adjustable negative pressure source pressure, which comprises a negative pressure monitoring circuit, a negative pressure pump control and feedback circuit, a Flash storage circuit, an LED and a buzzer prompt circuit, and a key trigger circuit connected with the MCU control circuit. The negative pressure monitoring circuit monitors the dressing state and feeds back to the MCU control circuit, and the negative pressure pump feedback circuit feeds back the working state of the negative pressure pump to the MCU control circuit, so that the MCU control circuit dynamically adjusts the negative pressure pump control according to the feedback signal and user configuration, maintains the negative pressure state of the dressing inner cavity, and makes the human tissue waste liquid continuously infiltrate into the dressing, realizes waste liquid collection, does not need to set up waste liquid recovery pipeline and recovery container, the control circuit and control process are simple, the overall structure is small, convenient to carry, and the cost is low.

[0016] 2. The Buck-Boost circuit is used in the power supply circuit of the present application, which makes the input gradual change power supply voltage stable output system voltage, and the input stage filter circuit and the output stage filter circuit matched with the Buck-Boost circuit are arranged, so that the power supply system is stable, thereby ensuring that the voltage signals collected by the negative pressure sensor circuit and the negative pressure pump circuit are more accurate, and through the cooperation of the voltage collection circuit and the main control MCU circuit, the battery capacity collection is carried out to judge the remaining battery capacity, so as to avoid the power failure phenomenon in the use process.

[0017] 3. The indicator light circuit in the present application can select a scanning drive circuit, which utilizes the characteristics of unidirectional conduction of diode and high impedance input of single-chip microcomputer, designs a scanning drive circuit, controls multiple LED lights with a small amount of control lines, saves hardware control resources, and reduces hardware control cost.

[0018] 4. The key start feedback circuit KEY_1 and PB15 are used in the power supply circuit of the present application, wherein KEY_1 is the key trigger output end in the key trigger circuit, and the two together realize the functions of power key start trigger and logic function trigger feedback, thereby improving the control flexibility.

[0019] 5. In the negative pressure pump control and feedback circuit of this invention, the negative pressure pump is an air pump with negative pressure maintenance, which ensures that the negative pressure does not leak when the air pump stops working. There is no need to install a one-way valve in the gas pipeline of the negative pressure pump, which simplifies the gas pipeline components in the system and saves structural space.

[0020] 6. This invention provides a negative pressure wound therapy method. It collects power supply information through a power circuit to ensure normal power supply, configures operating parameters through a Flash storage circuit, and provides dressing output parameter feedback through a negative pressure monitoring circuit, a negative pressure pump control and feedback circuit, thereby driving the negative pressure pump to operate and ensuring normal negative pressure in the dressing cavity. The control process is simple, the operation method is convenient, and it is easier for medical staff to operate and use. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Appendix Figure 1 This is a block diagram of the circuit system of the present invention.

[0023] Appendix Figure 2 This is a system flowchart of the present invention.

[0024] Appendix Figure 3 This is a schematic diagram of the power supply circuit structure.

[0025] Appendix Figure 4 This is a schematic diagram of a negative pressure monitoring circuit.

[0026] Appendix Figure 5 This is a schematic diagram of the MCU control circuit structure.

[0027] Appendix Figure 6 This is a schematic diagram of the control and feedback circuit structure of a negative pressure pump.

[0028] Appendix Figure 7 This is a schematic diagram of the Flash memory circuit structure.

[0029] Appendix Figure 8 This is a schematic diagram of the LED and buzzer prompt circuit structure.

[0030] Appendix Figure 9 This is a schematic diagram of the button trigger circuit.

[0031] Appendix Figure 10 This is a schematic diagram of the connection structure between the negative pressure pump and the dressing.

[0032] Figure 8 is a schematic diagram of the monitoring results of the negative pressure value in the cavity of the dressing when the negative pressure value is set to 40 mmHg. Figure 11 Figure 9 is a schematic diagram of the monitoring results of the negative pressure value in the cavity of the dressing when the negative pressure value is set to 80 mmHg.

[0033] Figure 10 is a schematic diagram of the monitoring results of the negative pressure value in the cavity of the dressing when the negative pressure value is set to 120 mmHg. Figure 12 Figure 11 is a schematic diagram of the monitoring results of the negative pressure value in the cavity of the dressing when the negative pressure value is set to 220 mmHg.

[0034] Figure 13 Figure 12 is a schematic diagram of the monitoring results of the negative pressure value in the cavity of the dressing when the negative pressure value is set to 220 mmHg.

[0035] Figure 13 is a schematic diagram of the monitoring results of the negative pressure value in the cavity of the dressing when the negative pressure value is set to 220 mmHg. Figure 14 Figure 14 is a schematic diagram of the monitoring results of the negative pressure value in the cavity of the dressing when the negative pressure value is set to 220 mmHg.

[0036] In the figure, 1 is a negative pressure pump gas pipeline, 101 is a elbow joint, 102 is a tee joint, 103 is a luer joint, 2 is a connecting pipeline, and 3 is a dressing. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0038] As shown in Figure 1, a miniature negative pressure wound treatment system is characterized by comprising a power supply circuit and an MCU control circuit, the power supply circuit and the MCU control circuit are connected with a negative pressure monitoring circuit, a negative pressure pump control and feedback circuit, a Flash storage circuit, an LED and buzzer prompting circuit, and a key triggering circuit respectively, and the negative pressure monitoring circuit and the negative pressure pump control and feedback circuit are connected with a dressing 3 through a pipeline. Figure 1 The power supply circuit comprises a power supply and a Buck-Boost circuit, the negative pressure monitoring circuit comprises a gas pressure sensor U4 and a signal processing circuit, the negative pressure pump control and feedback circuit comprises a negative pressure pump P6 and a driving circuit, the driving circuit is connected with a sampling circuit, the sampling circuit is connected with the signal processing circuit, and the LED and buzzer prompting circuit adopts a scanning driving circuit. Preferably, the gas pressure sensor U4 is a differential / bridge output sensor, which is used to convert a gas pressure signal into an electric signal.

[0039]

[0040] ​​In a specific embodiment, further, the power supply circuit includes a power input positive pole P2 and a negative pole P3, a power voltage feedback circuit R3, R4 and an anti-reverse connection protection circuit Q3, R26 are arranged between the positive pole P2 and the negative pole P3, the power voltage feedback circuit R3, R4 outputs through a feedback output terminal PA3, the output terminal of the Q3 is connected with a fuse F1, the output terminal of the fuse F1 is connected with a power control and feedback circuit Q2, Q4, R20, R21, R22, R23, R24, D2, PWR_EN in the power control and feedback circuit is a program control power output terminal, KEY_1, PB15 in the power control and feedback circuit is a key start feedback circuit, KEY_1 is used in combination with a key trigger circuit element K1, C32, R53, responsible for power key start trigger and logic function trigger feedback dual function, the Q4 and the negative pole P3 are provided with an input stage filter circuit C20, C21 and a Buck-Boost circuit, the Buck-Boost circuit includes U3, R25, R27, R28, R29, R30, for making input gradual change power voltage stable output system voltage, the Buck-Boost circuit system power output terminal is VCC, the VCC and the negative pole P3 are provided with an output stage filter circuit C22, C23.

[0041] In a specific embodiment, further, the signal processing circuit includes a signal amplification and baseline adjustment circuit R31, R32, R34, R35, U7.1 connected with a gas pressure sensor U4, the output terminal of the U7.1 is connected with a first-order passive low-pass filter R33, C28, and the output terminal of the first-order passive low-pass filter outputs a signal through PA5.

[0042] In a specific embodiment, further, the driving circuit includes U2 and a negative pressure pump control input terminal PA10, the sampling circuit includes R13, the signal processing circuit includes a first-order active low-pass filter circuit R11, R14, C16, the output terminal of the first-order active low-pass filter circuit is connected with a signal amplification circuit U7.2, R15, R16, for filtering out interference signals caused by the operation of the negative pressure pump, and R13 is responsible for the detection of online, offline, damage and other states of the negative pressure pump, and the in-phase input terminal is connected, and the output terminal of the signal amplification circuit outputs a signal through PA6.

[0043] In a specific embodiment, further, the LED and buzzer prompting circuit comprises an indicator lamp circuit and a buzzer circuit, the buzzer circuit comprises a buzzer BUZZER1, the BUZZER1 is connected with a buzzer control circuit R39, R40, Q5, the BUZZER1 is connected with a protection circuit D6 in parallel, the R40 is connected with a buzzer control input end PB6; the indicator lamp circuit selects one or more of an independent driving circuit and a scanning driving circuit; The independent driving circuit comprises a plurality of indicator lamp circuit input ends, each indicator lamp circuit input end is connected with a corresponding LED indicator lamp and a current limiting resistor; The scanning driving circuit comprises a plurality of indicator lamp circuit input ends, each indicator lamp circuit input end is connected with a corresponding current limiting resistor, each two indicator lamp circuit input ends are connected with an LED indicator lamp group, the LED indicator lamp group selects one of a single LED indicator lamp and two LED indicator lamps in opposite directions, and the maximum number a of the LED indicator lamps that can be used and the number (b) of the circuit input ends are related as a=2 .

[0044] Preferably, the indicator lamp circuit selects a combined circuit of the independent driving circuit and the scanning driving circuit, the LED indicator lamp selects LED1-LED14, the current limiting resistor selects R42-R49, the indicator lamp circuit input end is PB0, PB1, PB2, PB7, PB8, PB9, PA0, PA7, the scanning driving circuit is designed by using the characteristics of unidirectional conduction of diodes and high impedance input of single-chip microcomputers, 10 LED lamps are controlled by using 4 control lines, 6 control lines are saved compared with the conventional 10 control lines for controlling 10 LED, and the output scanning driving function is realized by using the characteristics of components and logic control codes.

[0045] In a specific embodiment, further, the key triggering circuit comprises key triggering devices K1, K2, K3, K4, the key triggering devices K1, K2, K3, K4 are respectively connected with pull-up resistors R53, R52, R51, R50, the key triggering devices K1, K2, K3, K4 are respectively connected with anti-interference capacitors C32, C33, C34, C35 in parallel, the key triggering devices K1, K2, K3, K4 are respectively provided with key triggering output ends KEY_1, PA12, PA11, PA8 between the corresponding pull-up resistors, the key triggering output end KEY_1 is connected with a power supply circuit, and the key triggering output end KEY_1 is combined to realize power key starting triggering and logic function triggering feedback dual functions.

[0046] In a specific embodiment, further, the MCU control circuit comprises a single-chip microcomputer U1, a reset circuit, a clock source, a power supply filtering circuit, a start-up booting circuit, the single-chip microcomputer U1 is a system core controller, responsible for signal acquisition, data conversion, data storage, information interaction, peripheral driving, logic control and other functions of the system, the reset circuit comprises R1 and C6, responsible for power-on reset, the clock source comprises X2, C9 and C10, responsible for system working clock, the power supply filtering circuit comprises L1, C8 and C4, ensuring stable power supply of the system, and the start-up booting circuit comprises R2, responsible for selecting a program start address during system power-on.

[0047] In a specific embodiment, further, the Flash storage circuit comprises a Flash storage chip U6, used for storing system information, and the U6 is provided with data communication interaction interfaces PA15, PB3, PB4 and PB5.

[0048] In a specific embodiment, further, the negative pressure pump P6 is connected with a negative pressure pump gas pipeline 1, the negative pressure pump gas pipeline 1 comprises an elbow joint 101 connected with the negative pressure pump P6, the elbow joint 101 is connected with a luer joint 103 through a three-way joint 102, the three-way joint 102 is connected with a body pressure sensor U4, and the luer joint 103 is directly connected with a dressing 3 through a connecting pipeline 2, so as to directly control the negative pressure value in the dressing 3 through the negative pressure pump P6.

[0049] Preferably, the negative pressure pump P6 is a gas pump with negative pressure retention, ensuring that the negative pressure is not leaked when the gas pump stops working, and compared with a gas pump without negative pressure retention, the gas pump of this specification can save a gas check valve in the gas pipeline in the system, save the number of system materials, and has higher integration.

[0050] A negative pressure wound treatment method, characterized in that it comprises the following steps: Step 1: power on the equipment, turn on the power supply circuit, and initialize the system; Step 2: the MCU control circuit collects power supply information of the power supply, to ensure that the power supply is normal; Step 3: the MCU control circuit drives the Flash storage circuit, reads flash information, and configures running parameters; Step 4: the MCU control circuit drives the key trigger circuit, detects key triggering, and the MCU control circuit controls the LED and the buzzer according to the triggering state fed back by the key trigger circuit; Step 5: the MCU control circuit drives the negative pressure monitoring circuit, collects and feeds back negative pressure signals, simultaneously, the negative pressure pump control and feedback circuit feeds back and transmits negative pressure pump working state parameters, and the MCU control circuit judges the state of the negative pressure wound treatment system according to the feedback negative pressure signals and the negative pressure pump working state parameters. Step 6: According to the negative pressure wound treatment system state judgment result in step 5, the MCU control circuit drives the negative pressure pump control and feedback circuit, when the dressing 3 is in the negative pressure value under pressure, the negative pressure pump P6 starts to increase the negative pressure, when the dressing 3 is in the negative pressure value overpressure, the negative pressure pump P6 stops, the system automatically depressurizes, thereby dynamically adjusting the negative pressure value; Step 7: After the treatment is completed, the MCU control circuit controls the power supply circuit to disconnect the power supply, and the system is shut down. Embodiment

[0051] The micro negative pressure wound treatment system is connected with the dressing, and the negative pressure values are respectively set to 40mmHg, 80mmHg, 120mmHg and 220mmHg. The negative pressure values in the dressing cavity are sampled and detected, and the sampling and detection results are shown in Table 1. Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 According to the sampling and detection results, it can be known that the micro negative pressure wound treatment system can operate under different set negative pressure value conditions. Medical staff can set different negative pressure value gears according to the wound conditions. Under the dynamic adjustment of the micro negative pressure wound treatment system, the negative pressure values in the dressing cavity are stably in the range of the set negative pressure value ±10mmHg, which ensures the healing speed of the patient's wound and the comfort degree in the healing process, and meets the clinical use requirements.

[0052] It can be understood that the above specific description of the present application is only used to illustrate the present application and is not limited to the technical solutions described in the embodiments of the present application. Those skilled in the art should understand that the present application can still be modified or replaced equivalently to achieve the same technical effect. As long as it meets the use requirements, it is within the protection scope of the present application.

[0053] It should be further noted that in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitation, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.​

Claims

1. A miniature negative pressure wound therapy system, characterized in that, It includes a power supply circuit and an MCU control circuit. The power supply circuit and the MCU control circuit are respectively connected to the negative pressure monitoring circuit, the negative pressure pump control and feedback circuit, the Flash storage circuit, the LED and buzzer prompt circuit, and the key trigger circuit. The negative pressure monitoring circuit and the negative pressure pump control and feedback circuit are connected to the dressing (3) through pipelines. The power supply circuit includes a power supply and a Buck-Boost circuit; the negative pressure monitoring circuit includes a gas pressure sensor U4 and a signal processing circuit; the negative pressure pump control and feedback circuit includes a negative pressure pump P6 and a drive circuit; the drive circuit is connected to the sampling circuit; the sampling circuit is connected to the signal processing circuit; and the LED and buzzer indication circuit uses a scanning drive circuit.

2. The miniature negative pressure wound therapy system according to claim 1, characterized in that, The power supply circuit includes a positive input terminal P2 and a negative input terminal P3. A power voltage feedback circuit R3 and R4, and a reverse connection protection circuit Q3 and R26 are arranged between the positive and negative input terminals P2 and P3. The power voltage feedback circuit R3 and R4 output through a feedback output terminal PA3. The output terminal of Q3 is connected to a fuse F1. The output terminal of fuse F1 is connected to a power control and feedback circuit Q2, Q4, R20, R21, R22, R23, R24, and D2. In the power control and feedback circuit, PWR_ EN is the programmable power output terminal. In the power control and feedback circuit, KEY_1 and PB15 are key-activated feedback circuits. An input stage filter circuit C20 and C21 and a Buck-Boost circuit are provided between Q4 and the negative terminal P3. The Buck-Boost circuit includes U3, R25, R27, R28, R29, and R30. The power supply output terminal of the Buck-Boost circuit system is VCC. An output stage filter circuit C22 and C23 are provided between VCC and the negative terminal P3.

3. The miniature negative pressure wound therapy system according to claim 1, characterized in that, The signal processing circuit includes signal amplification and baseline adjustment circuits R31, R32, R34, R35, and U7.1 connected to the gas pressure sensor U4. The output terminal of U7.1 is connected to a first-order passive low-pass filter R33 and C28. The output terminal of the first-order passive low-pass filter outputs a signal through PA5.

4. The miniature negative pressure wound therapy system according to claim 1, characterized in that, The driving circuit includes U2 and the negative pressure pump control input terminal PA10. The sampling circuit includes R13. The signal processing circuit includes a first-order active low-pass filter circuit R11, R14, and C16. The output terminal of the first-order active low-pass filter circuit is connected to the non-inverting input terminals of the signal amplification circuit U7.2, R15, and R16. The output terminal of the signal amplification circuit outputs a signal through PA6.

5. The miniature negative pressure wound therapy system according to claim 1, characterized in that, The LED and buzzer indication circuit includes an indicator light circuit and a buzzer circuit. The buzzer circuit includes a buzzer BUZZER1, which is connected to the buzzer control circuit R39, R40, and Q5. BUZZER1 is connected in parallel with the protection circuit D6, and R40 is connected to the buzzer control input terminal PB6. The indicator light circuit uses one or more of an independent drive circuit and a scanning drive circuit. The independent driving circuit includes multiple indicator light circuit input terminals, and each indicator light circuit input terminal is connected to a corresponding LED indicator and a current limiting resistor. The scanning drive circuit includes multiple indicator light circuit input terminals. Each indicator light circuit input terminal is connected to a corresponding current-limiting resistor. An LED indicator group is connected between every two indicator light circuit input terminals. The LED indicator group is selected from either a single LED indicator or two LED indicators with opposite directions.

6. The miniature negative pressure wound therapy system according to claim 1, characterized in that, The button triggering circuit includes button triggering devices K1, K2, K3, and K4. Each button triggering device K1, K2, K3, and K4 is connected to pull-up resistors R53, R52, R51, and R50, respectively. Each button triggering device K1, K2, K3, and K4 is connected in parallel with anti-interference capacitors C32, C33, C34, and C35, respectively. Each button triggering device K1, K2, K3, and K4 is connected to a corresponding pull-up resistor and has a button triggering output terminal KEY_1, PA12, PA11, and PA8, respectively. The button triggering output terminal KEY_1 is connected to the power supply circuit.

7. The miniature negative pressure wound therapy system according to claim 1, characterized in that, The MCU control circuit includes a microcontroller U1, a reset circuit, a clock source, a power supply filter circuit, and a startup circuit. The reset circuit includes R1 and C6, the clock source includes X2, C9, and C10, the power supply filter circuit includes L1, C8, and C4, and the startup circuit includes R2.

8. The miniature negative pressure wound therapy system according to claim 1, characterized in that, The Flash storage circuit includes a Flash storage chip U6, and the U6 is provided with data communication interaction interfaces PA15, PB3, PB4, and PB5.

9. The miniature negative pressure wound therapy system according to claim 1, characterized in that, The negative pressure pump P6 is connected to the negative pressure pump gas pipeline (1). The negative pressure pump gas pipeline (1) includes a bend connector (101) connected to the negative pressure pump P6. The bend connector (101) is connected to the Luer connector (103) through a tee connector (102). The tee connector (102) is connected to the gas pressure sensor U4. The Luer connector (103) is directly connected to the dressing (3) through the connecting pipeline (2).

10. A negative pressure wound therapy method using a miniature negative pressure wound therapy system according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Power on the device, connect the power circuit, and initialize the system; Step 2: The MCU control circuit collects power supply information to ensure normal power supply. Step 3: The MCU control circuit drives the Flash storage circuit to read flash information and configure operating parameters; Step 4: The MCU control circuit drives the button trigger circuit to detect button triggering. The MCU control circuit controls the LED and buzzer response according to the triggering status fed back by the button trigger circuit. Step 5: The MCU control circuit drives the negative pressure monitoring circuit to collect and feedback negative pressure signals. At the same time, the negative pressure pump control and feedback circuit transmits the negative pressure pump operating status parameters. The MCU control circuit judges the status of the negative pressure wound treatment system based on the feedback negative pressure signal and the negative pressure pump operating status parameters. Step 6: Based on the status judgment result of the negative pressure wound treatment system in Step 5, the MCU control circuit drives the negative pressure pump control and feedback circuit. When the dressing (3) is under-pressured, the negative pressure pump P6 starts to increase the negative pressure. When the dressing (3) is over-pressured, the negative pressure pump P6 stops and the system automatically depressurizes, thereby dynamically adjusting the negative pressure value. Step 7: After the treatment is completed, the MCU control circuit controls the power supply circuit to disconnect the power supply, and the system shuts down.

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