Medical vacuum negative pressure machine

Abstract

This utility model discloses a medical vacuum negative pressure machine, including a negative pressure generating component, a controller, a pressure detection circuit, and a blockage backflushing device. The negative pressure generating component includes an operating air port, a negative pressure pump, a positive pressure pipeline, a negative pressure pipeline, an inlet pipeline, and an exhaust pipeline. The negative pressure pump has a negative pressure end and a positive pressure end. A negative pressure pipeline connects the negative pressure end and the operating air port, and a positive pressure pipeline connects the positive pressure end and the operating air port. A branch point is provided in the middle of the positive pressure pipeline. One end of the exhaust pipeline is connected to the branch point, and the other end of the exhaust pipeline has an exhaust port. A confluence point is provided in the middle of the negative pressure pipeline, and one end of the inlet pipeline is connected to the confluence point. The other end of the inlet pipeline has an inlet port. The pressure detection circuit is connected to the controller and includes a pressure sensor. It can effectively solve the problem of blockage in the negative pressure pipeline, enabling it to achieve the required negative pressure.

Description

Technical Field

[0001] This utility model relates to a medical vacuum negative pressure machine, belonging to the field of medical device technology. Background Technology

[0002] Currently, medical vacuum negative pressure machines are the core equipment of negative pressure wound therapy. After closing an open wound, a special negative pressure machine generates a certain negative pressure, which is then applied to the cleaned wound through drainage tubes and dressings. Patent CN221770991U discloses a medical vacuum negative pressure machine that generates negative pressure through a suction device. Under this negative pressure, a drainage device aspirates tissue fluid and pus from the skin wound and stores it in a drainage cavity. However, this type of medical vacuum negative pressure machine can only generate negative pressure; when encountering blockages in the tubing, it cannot effectively clear the blockage and fails to achieve the required negative pressure. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a medical vacuum negative pressure machine that can effectively solve the problem of blockage in the negative pressure pipeline and enable it to meet the negative pressure requirements.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a medical vacuum negative pressure machine, comprising a negative pressure generating component, a controller, a pressure detection circuit, and a backflow blocking device; wherein,

[0005] The negative pressure generating component includes an operating air port, a negative pressure pump, a positive pressure pipeline, a negative pressure pipeline, an air inlet pipeline, and an exhaust pipeline. The negative pressure pump has a negative pressure end and a positive pressure end. A negative pressure pipeline connects the negative pressure end and the operating air port. A positive pressure pipeline connects the positive pressure end and the operating air port. A branch point is provided in the middle of the positive pressure pipeline. One end of the exhaust pipeline is connected to the branch point, and the other end of the exhaust pipeline has an exhaust port. A confluence point is provided in the middle of the negative pressure pipeline. One end of the air inlet pipeline is connected to the confluence point, and the other end of the air inlet pipeline has an air inlet.

[0006] The air pressure detection circuit is connected to the controller. The air pressure detection circuit includes an air pressure sensor and is adapted to collect the negative pressure value generated by the negative pressure pump and feed it back to the controller.

[0007] The blockage backflushing device includes an intake solenoid valve, a blowing solenoid valve, an inlet solenoid valve, and an exhaust solenoid valve. The intake solenoid valve is connected between the junction point of the negative pressure pipeline and the working air port. The blowing solenoid valve is connected between the branch point of the positive pressure pipeline and the working air port. The exhaust solenoid valve is connected in the exhaust pipeline. The inlet solenoid valve is connected in the inlet pipeline.

[0008] The controller is used to control the operation of the intake solenoid valve, the blowing solenoid valve, the inlet solenoid valve, and the exhaust solenoid valve based on the negative pressure value collected within a set time by the air pressure detection circuit.

[0009] Furthermore, the medical vacuum negative pressure machine also includes a negative pressure pump drive circuit connected to the negative pressure pump control to control the operation of the negative pressure pump. The controller is connected to the negative pressure pump drive circuit to control the operation of the negative pressure pump drive circuit according to the negative pressure value collected by the air pressure detection circuit.

[0010] Furthermore, the medical vacuum negative pressure machine also includes an LED status indicator circuit, and the controller is connected to the LED status indicator circuit to control the operation of the LED status indicator circuit according to the negative pressure value collected by the air pressure detection circuit.

[0011] Furthermore, the medical vacuum negative pressure machine also includes a button operation circuit, which is connected to the controller to transmit button operation signals to the controller.

[0012] Furthermore, the medical vacuum negative pressure machine also includes a power management circuit, which is connected to the controller for power supply.

[0013] Furthermore, the medical vacuum negative pressure machine also includes a charging circuit, which is connected to the power management circuit.

[0014] Furthermore, the controller is an MCU controller.

[0015] Furthermore, the medical vacuum negative pressure machine also includes a negative pressure buffer bottle connected to an external interface. The working air port is connected to the negative pressure buffer bottle, and the air pressure detection circuit is connected to the negative pressure buffer bottle to collect the negative pressure value in the negative pressure buffer bottle, thereby obtaining the negative pressure value generated by the negative pressure pump.

[0016] After adopting the above technical solution, if the air pressure detection circuit fails to detect a negative pressure value of 40 mmHg within a set time due to pipeline blockage, the controller will drive the blockage backflushing device. The blockage backflushing device will control the closing of the intake solenoid valve, opening of the inlet solenoid valve, opening of the blowing solenoid valve, and closing of the exhaust solenoid valve to complete the function of switching from negative pressure to positive pressure. By repeatedly switching between positive and negative pressure over a preset time, the blockage in the pipeline can be cleared. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the principle of the medical vacuum negative pressure machine of this utility model;

[0018] Figure 2 This is a circuit diagram of the LED status indicator circuit of this utility model;

[0019] Figure 3 This is a circuit diagram of the button operation circuit of this utility model;

[0020] Figure 4 This is a circuit diagram of the air pressure detection circuit of this utility model;

[0021] Figure 5 This is a circuit diagram of the power supply circuit of this utility model;

[0022] Figure 6 This is a connection diagram of the negative pressure pump of this utility model; wherein,

[0023] 1. Controller;

[0024] 2. Air pressure detection circuit;

[0025] 3. Blocking backflushing device; 31. Intake solenoid valve; 32. Blowing solenoid valve; 33. Intake solenoid valve; 34. Exhaust solenoid valve;

[0026] 41. Functional air inlet; 42. Negative pressure pump; 42a. Negative pressure end; 42b. Positive pressure end; 43. Positive pressure pipeline; 44. Negative pressure pipeline; 45. Inlet pipeline; 45a. Inlet; 46. Exhaust pipeline; 46a. Exhaust port; 47. External interface;

[0027] 5. Negative pressure pump drive circuit;

[0028] 6. LED status indicator circuit;

[0029] 7. Button operation circuit;

[0030] 8. Power management circuit;

[0031] 9. Charging circuit. Detailed Implementation

[0032] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0033] like Figures 1-6 As shown, a medical vacuum negative pressure machine includes a negative pressure generating component, a controller 1, a pressure detection circuit 2, and a backflushing device 3; wherein,

[0034] The negative pressure generating component includes an operating air port 41, a negative pressure pump 42, a positive pressure pipeline 43, a negative pressure pipeline 44, an air intake pipeline 45, and an exhaust pipeline 46. The negative pressure pump has a negative pressure end 42a and a positive pressure end 42b. The negative pressure end 42a and the operating air port 41 are connected by the negative pressure pipeline 44, and the positive pressure end 42b and the operating air port 41 are connected by the positive pressure pipeline 43. A branch point is provided in the middle of the positive pressure pipeline 43. One end of the exhaust pipeline 46 is connected to the branch point, and the other end of the exhaust pipeline 46 is provided with an exhaust port 46a. A confluence point is provided in the middle of the negative pressure pipeline 44. One end of the air intake pipeline 45 is connected to the confluence point, and the other end of the air intake pipeline 45 is provided with an air intake port 45a.

[0035] The air pressure detection circuit 2 is connected to the controller 1. The air pressure detection circuit 2 includes an air pressure sensor. The air pressure detection circuit 2 is adapted to collect the negative pressure value generated by the negative pressure pump and feed it back to the controller 1.

[0036] The backflushing device 3 includes an intake solenoid valve 31, a blowing solenoid valve 32, an intake solenoid valve 33, and an exhaust solenoid valve 34. The intake solenoid valve 31 is connected between the junction point of the negative pressure pipeline 44 and the working port 41. The blowing solenoid valve 32 is connected between the branch point of the positive pressure pipeline 43 and the working port 41. The exhaust solenoid valve 34 is connected in the exhaust pipeline 46. The intake solenoid valve 33 is connected in the intake pipeline 45.

[0037] The controller 1 is used to control the operation of the intake solenoid valve 31, the blowing solenoid valve 32, the intake solenoid valve 33 and the exhaust solenoid valve 34 according to the negative pressure value collected within a set time by the air pressure detection circuit 2.

[0038] In this embodiment, if the air pressure detection circuit 2 fails to detect a negative pressure value of 40 mmHg within a set time due to pipeline blockage, the controller 1 controls the drive of the blockage backflushing device 3. The blockage backflushing device 3 controls the closing of the intake solenoid valve 31, the opening of the intake solenoid valve 33, the opening of the blowing solenoid valve 32, and the closing of the exhaust solenoid valve 34, thereby completing the function of switching from negative pressure to positive pressure. The positive and negative pressure are repeatedly switched over a preset time to clear the blockage in the pipeline.

[0039] Specifically, such as Figure 1 As shown, the medical vacuum negative pressure machine also includes a negative pressure pump drive circuit 5 connected to the negative pressure pump control to control the operation of the negative pressure pump. The controller 1 is connected to the negative pressure pump drive circuit 5 to control the operation of the negative pressure pump drive circuit 5 according to the negative pressure value collected by the air pressure detection circuit 2.

[0040] Specifically, such as Figure 1 As shown, the medical vacuum negative pressure machine also includes an LED status indicator circuit 6. The controller 1 is connected to the LED status indicator circuit 6 to control the operation of the LED status indicator circuit 6 according to the negative pressure value collected by the air pressure detection circuit 2.

[0041] In this embodiment, the LED status indicator circuit 6 control circuit is as follows: Figure 2 As shown, the LED status indicator circuit 6 consists of multiple LEDs (LED1-LED9), current-limiting resistors (resistors R1, R46-R53), and a transistor U17. The controller 1 controls the on / off state of the LEDs by controlling the conduction of the transistor, thus realizing the status indicator function.

[0042] Specifically, the air pressure detection circuit 2, such as Figure 4 As shown, the air pressure detection circuit 2 senses changes in external air pressure through the air pressure sensor U15. The air pressure sensor U15 converts the collected air pressure signal into a weak voltage signal. After the weak signal is initially amplified by the circuit composed of components U11.4, U11.3, R31 (10kΩ), R32 (10kΩ), and R33 (15kΩ), the signal is further amplified by the circuit composed of components U11.1, R36 (20kΩ), R37 (20kΩ), R40 (1.5kΩ), and R41 (1.5kΩ) to further adjust the signal gain. After the air pressure signal is amplified to a voltage range suitable for analog-to-digital conversion, it is filtered by the filter circuit composed of components R38 (3.3kΩ), R64 (3.3kΩ), and C23 (100nF capacitor) before finally being output to FUYA_ADC.

[0043] The air pressure detection circuit 2 converts the expected negative pressure value change into a corresponding voltage change, and after processing such as proportional amplification and signal matching, it is sent to the controller 1. The controller 1 compares the voltage change collected with the expected voltage change to determine whether the current negative pressure value is within the expected range. If it is, the controller 1 outputs a control signal to the LED status indicator circuit 6, and the LED status indicator circuit 6 lights up the corresponding LED after receiving the signal. If not, the controller 1 outputs a control signal to keep the negative pressure pump drive circuit 5 in operation and outputs a control signal to make the LED status indicator circuit 6 light up the corresponding LED.

[0044] Specifically, such as Figure 1 As shown, the medical vacuum negative pressure machine also includes a button operation circuit 7, which is connected to the controller 1 to transmit button operation signals to the controller 1. The controller 1 executes the negative pressure task to drive the start and stop of the negative pressure pump according to the control signals sent by the button operation circuit 7.

[0045] In this embodiment, the button operation circuit 7 is as follows: Figure 3As shown, the button operation circuit 7 includes a button POW KEY, capacitor C1, resistors R39, R18, and R60, and transistors Q1 and Q2. When the button is not pressed, the circuit is in its initial state. The base of transistor Q1 is connected to VCC_BAT through resistor R18, and is in a high-level state, so transistor Q1 is off. The base of transistor Q2 is connected to the collector of transistor Q1 through resistor R60. Since transistor Q1 is off, the base of transistor Q2 is in a low-level state, so transistor Q2 is also off. At this time, no operation signal is transmitted to controller 1. When the user presses the button POW KEY, the electrical state of the circuit changes. The button connects capacitor C1 and resistors R39 and R18, forming a charging and discharging circuit. At the instant the button is pressed, capacitor C1 begins to discharge through resistor R39, causing the base voltage of transistor Q1 to drop rapidly. When the base voltage of transistor Q1 drops to a certain level, transistor Q1 turns on. When transistor Q1 turns on, its collector voltage drops, causing the base voltage of transistor Q2 to also drop, and transistor Q2 then turns on. Due to the debouncing effect of the RC circuit (capacitor C1 and resistors R39 and R18), the voltage of capacitor C1 does not change rapidly during button bounce, ensuring that transistors Q1 and Q2 only turn on stably after the button is firmly pressed. This amplifies the signal generated by the button operation and transmits it to controller 1. When the button is released, VCC_BAT begins charging fuse C1 through resistor R18, the base voltage of transistor Q1 gradually rises, and transistors Q1 and Q2 gradually turn off, returning to their initial state, awaiting the next button operation. The button operation circuit 7 generates a signal through button operation, and after debouncing and amplification, transmits the stable operation signal to controller 1 to realize the user's control function.

[0046] Specifically, such as Figure 1 As shown, the medical vacuum negative pressure machine also includes a power management circuit 8, which is connected to the controller 1 for power supply.

[0047] Specifically, such as Figure 1 As shown, the medical vacuum negative pressure machine also includes a charging circuit 9, which is connected to the power management circuit 8.

[0048] In this embodiment, the power management circuit 8 is as follows: Figure 5 As shown, the charging circuit 93 receives the external input power supply VCCIN through interface CN2, providing initial power input to the circuit. A filter circuit is formed using capacitors (such as C16, C17, C18, and C19) to filter out high-frequency noise and low-frequency ripple in the input power supply, ensuring its stability. The input voltage is then converted into a stable voltage required by each module of the system (providing a stable VCC_BAT or +5V, etc., for subsequent circuits). Figure 5In the process, components such as chip U14 constitute the core of charging management. Chip U14 monitors the battery status through pin CHRG and pin PROG. When the battery power is low, it charges the battery with a constant current to quickly increase the power. When the battery voltage is close to full charge, it switches to constant voltage mode to prevent overcharging and extend battery life.

[0049] Specifically, such as Figure 1 As shown, controller 1 is MCU controller 1.

[0050] Specifically, such as Figure 6 As shown, the medical vacuum negative pressure machine also includes a negative pressure buffer bottle connected to the external interface 47, an active air port 41 connected to the negative pressure buffer bottle, and a pressure detection circuit 2 connected to the negative pressure buffer bottle to collect the negative pressure value of the negative pressure in the negative pressure buffer bottle, thereby obtaining the negative pressure value of the negative pressure generated by the negative pressure pump.

[0051] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A medical vacuum negative pressure machine, characterized in that, It includes a negative pressure generating component, a controller, a pressure detection circuit, and a backflow prevention device; among which, The negative pressure generating component includes an operating air port, a negative pressure pump, a positive pressure pipeline, a negative pressure pipeline, an air inlet pipeline, and an exhaust pipeline. The negative pressure pump has a negative pressure end and a positive pressure end. A negative pressure pipeline connects the negative pressure end and the operating air port. A positive pressure pipeline connects the positive pressure end and the operating air port. A branch point is provided in the middle of the positive pressure pipeline. One end of the exhaust pipeline is connected to the branch point, and the other end of the exhaust pipeline has an exhaust port. A confluence point is provided in the middle of the negative pressure pipeline. One end of the air inlet pipeline is connected to the confluence point, and the other end of the air inlet pipeline has an air inlet. The air pressure detection circuit is connected to the controller. The air pressure detection circuit includes an air pressure sensor and is adapted to collect the negative pressure value generated by the negative pressure pump and feed it back to the controller. The blockage backflushing device includes an intake solenoid valve, a blowing solenoid valve, an inlet solenoid valve, and an exhaust solenoid valve. The intake solenoid valve is connected between the junction point of the negative pressure pipeline and the working air port. The blowing solenoid valve is connected between the branch point of the positive pressure pipeline and the working air port. The exhaust solenoid valve is connected in the exhaust pipeline. The inlet solenoid valve is connected in the inlet pipeline. The controller is used to control the operation of the intake solenoid valve, the blowing solenoid valve, the inlet solenoid valve, and the exhaust solenoid valve based on the negative pressure value collected within a set time by the air pressure detection circuit.

2. The medical vacuum negative pressure machine according to claim 1, characterized in that, It also includes a negative pressure pump drive circuit connected to the negative pressure pump control to control the operation of the negative pressure pump, and the controller is connected to the negative pressure pump drive circuit to control the operation of the negative pressure pump drive circuit according to the negative pressure value collected by the air pressure detection circuit.

3. The medical vacuum negative pressure machine according to claim 1, characterized in that, It also includes an LED status indicator circuit, and the controller is connected to the LED status indicator circuit to control the operation of the LED status indicator circuit according to the negative pressure value collected by the air pressure detection circuit.

4. The medical vacuum negative pressure machine according to claim 1, characterized in that, It also includes a button operation circuit, which is connected to the controller to transmit button operation signals to the controller.

5. The medical vacuum negative pressure machine according to claim 1, characterized in that, It also includes a power management circuit, which is connected to the controller for power supply.

6. The medical vacuum negative pressure machine according to claim 5, characterized in that, It also includes a charging circuit, which is connected to the power management circuit.

7. The medical vacuum negative pressure machine according to claim 1, characterized in that, The controller is an MCU controller.

8. The medical vacuum negative pressure machine according to claim 1, characterized in that, It also includes a negative pressure buffer bottle connected to an external interface, the working air port is connected to the negative pressure buffer bottle, and the air pressure detection circuit is connected to the negative pressure buffer bottle to collect the negative pressure value in the negative pressure buffer bottle so as to obtain the negative pressure value generated by the negative pressure pump.

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