An automatic negative pressure suction device, system, and control method

Abstract

The application relates to the technical field of medical devices, in particular to an automatic negative pressure suction device, a system and a control method, the automatic negative pressure suction device comprising a bottle body and a device cabin, wherein a negative pressure pump, a pressure sensor, an electric conductivity sensor, an electric control air release valve and a main control board are arranged in the device cabin; a microcontroller is arranged on the main control board, the microcontroller is electrically connected with the negative pressure pump, the pressure sensor, the electric conductivity sensor and the electric control air release valve, the microcontroller pre-stores a mapping table of electric conductivity and a preset negative pressure threshold range, and the microcontroller is configured to: according to a comparison result of a negative pressure value detected by the pressure sensor and the preset negative pressure threshold range, control start and stop of the negative pressure pump, so as to maintain the negative pressure in the bottle body in the preset negative pressure threshold range. The application monitors the infection state of postoperative wound drainage fluid, realizes automatic identification of the property of the drainage fluid and negative pressure adaptation.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to an automatic negative pressure suction device, system, and control method. Background Technology

[0002] Negative pressure wound therapy (NPWT) is now widely used in the treatment of various acute and chronic wounds in departments such as trauma surgery, orthopedics, general surgery, and burn surgery. By applying a occlusive dressing and negative pressure to the wound, it can effectively remove exudate and necrotic tissue, reduce tissue edema, and promote granulation tissue growth, thereby accelerating wound healing. While suction devices with closed-loop negative pressure control have been developed, many practical problems still need to be solved. First, in clinical practice, the nature of drainage fluid (e.g., purulent and bloody) is an important indicator for judging the infection status and healing process of wounds. Traditional methods require removing the closure dressing to take samples for testing, which is cumbersome and increases the risk of infection.

[0003] Second, the ideal negative pressure value required also differs when the nature of the drainage fluid changes—purulent drainage fluid requires lower negative pressure to avoid damaging the inflammatory wound, while clear drainage fluid can use higher negative pressure to improve drainage efficiency.

[0004] Third, existing technologies only change the negative pressure by adjusting the opening of the vent valve, relying on the continuous operation of the negative pressure source, and cannot actively and timely adjust the negative pressure. Summary of the Invention

[0005] The present invention aims to provide an automatic negative pressure suction device, system and control method to solve at least one practical technical problem in the existing negative pressure drainage technology mentioned above.

[0006] To achieve the above objectives, according to one aspect of the present invention, a negative pressure suction device is provided, comprising: a bottle for storing negative pressure and collecting drainage fluid; a drainage pipe connected to the bottle; and an equipment compartment located above the bottle, wherein a negative pressure pump, a pressure sensor, a conductivity sensor, an electrically controlled vent valve, and a main control board are disposed within the equipment compartment; wherein the suction port of the negative pressure pump is connected to the interior of the bottle for extracting gas from the bottle to form a negative pressure; the pressure sensor is used to detect the negative pressure value within the bottle and transmit the detection signal to the main control board; the conductivity sensor is used to detect the conductivity of the drainage fluid and transmit the detection signal to the main control board; the electrically controlled vent valve is connected to the interior of the bottle for introducing external air to reduce the absolute value of the negative pressure; a microcontroller is disposed on the main control board, the microcontroller is electrically connected to the negative pressure pump, the pressure sensor, the conductivity sensor, and the electrically controlled vent valve, the microcontroller pre-stores a mapping table of conductivity and a preset negative pressure threshold range, and the microcontroller is configured to: Based on the comparison between the negative pressure value detected by the pressure sensor and the preset negative pressure threshold range, the start and stop of the negative pressure pump are controlled to maintain the negative pressure in the bottle within the preset negative pressure threshold range. Based on the conductivity of the drainage fluid detected by the conductivity sensor, the corresponding new preset negative pressure threshold range is determined by querying the mapping table, and the current preset negative pressure threshold range is updated to the new preset negative pressure threshold range. After updating the preset negative pressure threshold range, the current negative pressure value in the bottle is compared with the updated preset negative pressure threshold range. If the current negative pressure value is lower than the lower limit of the updated preset negative pressure threshold range, the negative pressure pump is stopped and the electronically controlled vent valve is opened to release pressure until the negative pressure value enters the updated preset negative pressure threshold range. If the current negative pressure value is higher than the upper limit of the updated preset negative pressure threshold range, the negative pressure pump is started to pump air until the negative pressure value enters the updated preset negative pressure threshold range.

[0007] Preferably, the microcontroller is further configured to: determine the nature of the drainage fluid using a hysteresis comparison mechanism, the hysteresis comparison mechanism including: setting a first drainage fluid conductivity threshold and a second drainage fluid conductivity threshold, wherein the first drainage fluid conductivity threshold is greater than the second drainage fluid conductivity threshold; when the current drainage fluid state recorded by the microcontroller is normal and the detected conductivity is greater than or equal to the first drainage fluid conductivity threshold, the current drainage fluid state is determined to be purulent; when the current drainage fluid state recorded by the microcontroller is purulent and the detected conductivity is less than or equal to the second drainage fluid conductivity threshold, the current drainage fluid state is determined to be normal; when the conductivity is between the second drainage fluid conductivity threshold and the first drainage fluid conductivity threshold, the current drainage fluid state is determined to remain unchanged.

[0008] Preferably, the microcontroller is further configured to: after updating the preset negative pressure threshold range, enter a lock time window, not respond to new changes in the conductivity of the drainage fluid within the lock time window, and exit the lock time window and re-evaluate after the negative pressure value enters the updated preset negative pressure threshold range and the sampled values ​​are within the range for a preset number of consecutive times.

[0009] Preferably, the microcontroller is further configured to: determine the sealing status of the bottle and the drainage pipeline based on at least two parameters among the negative pressure change rate detected by the pressure sensor, the operating power of the negative pressure pump, and the start frequency of the negative pressure pump, wherein the sealing status includes normal sealing status, slight leakage status, moderate leakage status, and severe leakage status; and the microcontroller performs graded alarms and corresponding negative pressure compensation actions according to different sealing statuses.

[0010] Preferably, the device further includes a drainage volume monitoring module for real-time monitoring of the drainage volume per unit time; the microcontroller is also configured to issue a prompt signal when the drainage volume is lower than a preset flow threshold within a continuous predetermined time.

[0011] Preferably, the negative pressure suction device further includes a communication module, which is electrically connected to the main control board and is used to upload the data detected by the pressure sensor and the conductivity sensor, as well as the control data of the microcontroller, to the host computer system.

[0012] According to another aspect of this application, an automatic negative pressure suction system is provided, comprising: at least one automatic negative pressure suction device as described above, and a host computer system communicatively connected to the automatic negative pressure suction device. The host computer system includes: a data receiving module for receiving and storing drainage data uploaded by the automatic negative pressure suction device and clinical operation records input by medical personnel through a human-machine interface; a storage module for storing historical drainage data and clinical operation records; and an analysis module for constructing a drainage treatment data model based on the stored historical drainage data and clinical operation records, and analyzing the current drainage process based on the drainage treatment data model to generate treatment suggestions or early warning information.

[0013] According to another aspect of this application, a control method for an automatic negative pressure suction device is also provided, applied to the automatic negative pressure suction device as described above, comprising: The negative pressure value inside the bottle is detected by the pressure sensor. When the detected negative pressure value is lower than the lower limit of the preset negative pressure threshold range, the microcontroller starts the negative pressure pump to pump air until the negative pressure value is restored to the preset negative pressure threshold range. The conductivity of the drainage fluid is detected by the conductivity sensor. The microcontroller determines the corresponding new preset negative pressure threshold range by querying the mapping table based on the conductivity of the drainage fluid, and updates the current preset negative pressure threshold range to the new preset negative pressure threshold range; The microcontroller compares the current negative pressure value inside the bottle with the updated preset negative pressure threshold range. If the current negative pressure value is lower than the lower limit of the updated preset negative pressure threshold range, the negative pressure pump is stopped and the electronically controlled vent valve is opened to release pressure until the negative pressure value enters the updated preset negative pressure threshold range. If the current negative pressure value is higher than the upper limit of the updated preset negative pressure threshold range, the negative pressure pump is started to pump air until the negative pressure value enters the updated preset negative pressure threshold range.

[0014] Preferably, the control method further includes: the microcontroller acquiring and determining the sealing status of the bottle and the drainage pipeline based on at least two parameters among the negative pressure change rate detected by the pressure sensor, the operating power of the negative pressure pump, and the start frequency of the negative pressure pump; and the microcontroller executing graded alarms and corresponding negative pressure compensation actions based on the determination result of the sealing status.

[0015] Compared with the prior art, the automatic negative pressure suction device, system and control method provided in this application have at least the following beneficial effects: (1) The automatic negative pressure suction device of this application does not require disassembling the sealing dressing for sampling and testing. It monitors the infection status of the postoperative wound drainage fluid, realizes automatic identification of the drainage fluid properties and negative pressure adaptation, and uses matching negative pressure for different drainage fluid properties to effectively solve the contradiction between drainage efficiency and wound protection.

[0016] (2) In view of the fact that existing drainage lines are prone to air leakage but the degree of leakage cannot be distinguished and appropriate negative pressure compensation measures cannot be taken, the automatic negative pressure suction device of this application can take appropriate negative pressure compensation measures in a timely manner based on the negative pressure value in the bottle and the judgment of the nature of the patient's drainage fluid, start the negative pressure pump to draw air or open the electric control vent valve to release pressure, and judge and control the pressure value in the bottle in a timely manner.

[0017] (3) The automatic negative pressure suction device of this application solves the problem of action conflict that may occur when the change of the properties of the drainage fluid triggers the switching of the negative pressure level by introducing an electronically controlled vent valve and a hysteresis comparison mechanism, thus realizing a smooth connection between the change of the negative pressure threshold and the adjustment of the negative pressure.

[0018] (4) The automatic negative pressure suction system of this application mainly relies on manual recording of clinical drainage fluid properties of patients receiving negative pressure suction treatment on a regular or irregular basis. It cannot form a systematic data record, which is not conducive to the analysis and decision support of subsequent treatment for such patients. The system realizes the digital and intelligent management of drainage treatment through the host computer system, and provides data support for clinical decision-making.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A simplified external view of an automatic negative pressure suction device according to an embodiment of this application is shown; Figure 2A schematic diagram of the main functional modules of the equipment compartment of an automatic negative pressure suction device according to an embodiment of this application is shown; Figure 3 A block diagram of an automatic negative pressure suction system according to an embodiment of this application is shown; Figure 4 A flowchart illustrating a control method for an automatic negative pressure suction device according to an embodiment of this application is shown; Figure 5 A flowchart illustrating the steps that can be implemented in another embodiment of the automatic negative pressure suction device of this application; The same or similar reference numerals in the accompanying drawings represent the same or similar structures.

[0021] Reference numerals: 1-Bottle body; 2-Equipment compartment; 3-Button panel; 4-Hook; 5-Rotary joint; 6-Robert clamp; 7-Connector; 8-Luer connector; 9-Conduit; 21-Negative pressure pump; 22-Pressure sensor; 23-Conductivity sensor; 24-Electrically controlled vent valve; 25-Main control board; 26-Microcontroller; 31-Data receiving module; 32-Storage module; 33-Analysis module. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0024] For the purpose of facilitating an understanding of the principles of this application, reference will now be made to the embodiments shown in the accompanying drawings, and they will be described using specific language. However, it should be understood that this is not intended to limit the scope of this application. Any changes and further modifications to the described apparatus, as well as any further applications of the principles of this application, are fully contemplated and included within this application, as would normally occur to those skilled in the art to which this application pertains.

[0025] According to one aspect of this application, an automatic negative pressure suction device is provided, the appearance of which can be referred to... Figure 1 As shown, Figure 1 A simplified external view of an automatic negative pressure suction device provided in one embodiment of this application is shown.

[0026] according to Figure 1 The automatic negative pressure suction device of this application includes a bottle 1 for storing negative pressure and collecting drainage fluid, an equipment compartment 2 located above the bottle 1, a button panel 3 located on the equipment compartment 2, a hook for easy access, a rotary joint 5 for connecting the equipment compartment 2 and the catheter 9, a Robert clamp 6 for controlling the opening and closing of the catheter 9, a connector 7 for connecting the catheter 9 to a drainage tube used for clinical drainage, and a Luer connector 8 for controlling the connection and closure of the connector 7 and the catheter 9.

[0027] Specifically, the bottle body 1 can be made of transparent medical plastic and is used to store negative pressure and collect drainage fluid. The capacity of the bottle body 1 can be set to 500ml, 1000ml or 1500ml according to clinical needs. The outer wall of the bottle body 1 can be set with capacity scale lines to facilitate medical staff to visually observe the amount of drainage fluid.

[0028] The equipment compartment 2 can be sealed and connected to the top of the bottle body 1. The main functional modules inside the equipment compartment 2 will be described in detail below. The button panel 3 can be equipped with multiple buttons and a display screen to receive operations from the operator on the automatic negative pressure suction device, such as manually adjusting the negative pressure, and to display information such as negative pressure value and drainage status.

[0029] Hook 4 can be attached to the side of equipment compartment 2 by adhesive or hinge, for suspending the negative pressure suction device from bed railings or other locations, or as a handle for carrying. Rotary joint 5 can be located on top of equipment compartment 2, with one end connected to the drainage port inside the compartment 2 and the other end connected to catheter 9, allowing for 360-degree rotation of the catheter to accommodate different tubing routes. Robert clip 6 is attached to catheter 9 to control its opening and closing. Connector 7 connects catheter 9 to clinically used drainage tubes. Luer connector 8 is attached to catheter 9 and has a normally closed valve body, allowing connection of a syringe for aspirating drainage fluid samples or injecting medication.

[0030] It should be noted that, except as otherwise described in detail and specifically mentioned herein, the above-mentioned components of the automatic negative pressure suction device can all be implemented using existing technologies that are applicable to this application.

[0031] For the main functional modules of equipment compartment 2, please refer to Figure 2 , Figure 2 A schematic diagram of the main functional modules of the equipment compartment 2 of an automatic negative pressure suction device according to an embodiment of this application is shown.

[0032] according to Figure 2The automatic negative pressure suction device of this application has a negative pressure pump 21, a pressure sensor 22, a conductivity sensor 23, an electrically controlled vent valve 24, and a main control board 25 installed in its equipment compartment 2. The suction port of the negative pressure pump 21 is connected to the interior of the bottle 1 to extract gas from the bottle 1 to create a negative pressure. The pressure sensor 22 detects the negative pressure value inside the bottle 1 and transmits the detection signal to the main control board 25. The conductivity sensor 23 detects the conductivity of the drainage fluid and transmits the detection signal to the main control board 25. The electrically controlled vent valve 24 is connected to the interior of the bottle 1 to introduce outside air to reduce the absolute value of the negative pressure. A microcontroller 26 is installed on the main control board 25. The microcontroller 26 is electrically connected to the negative pressure pump 21, the pressure sensor 22, the conductivity sensor 23, and the electrically controlled vent valve 24. The microcontroller 26 has a pre-stored mapping table of conductivity and preset negative pressure threshold ranges. The microcontroller 26 is configured as follows: —Based on the comparison result between the negative pressure value detected by the pressure sensor 22 and the preset negative pressure threshold range, the start and stop of the negative pressure pump 21 are controlled to maintain the negative pressure in the bottle 1 within the preset negative pressure threshold range; —Based on the conductivity of the drainage fluid detected by the conductivity sensor 23, the corresponding new preset negative pressure threshold range is determined by querying the mapping table, and the current preset negative pressure threshold range is updated to the new preset negative pressure threshold range; —After updating the preset negative pressure threshold range, compare the current negative pressure value inside the bottle 1 with the updated preset negative pressure threshold range. If the current negative pressure value is lower than the lower limit of the updated preset negative pressure threshold range, stop the negative pressure pump 21 and open the electronically controlled vent valve 24 to release pressure until the negative pressure value enters the updated preset negative pressure threshold range. If the current negative pressure value is higher than the upper limit of the updated preset negative pressure threshold range, start the negative pressure pump 21 to pump air until the negative pressure value enters the updated preset negative pressure threshold range.

[0033] Specifically, the negative pressure pump 21 can be implemented using existing negative pressure suction pumps commonly used in the medical device field, and is not limited here. The suction port of the negative pressure pump 21 can be connected to the inside of the bottle 1 through existing structures such as a one-way valve to ensure that gas can only flow from the bottle 1 to the negative pressure pump 21, preventing outside air from flowing back into the bottle 1 and causing a drop in negative pressure when the negative pressure pump 21 stops working. The exhaust port of the negative pressure pump 21 is connected to the atmosphere. When the negative pressure pump 21 is working, it draws gas from the bottle 1, thereby creating a negative pressure inside the bottle 1. The negative pressure pump 21 is preferably an oil-free, silent diaphragm pump, with a maximum negative pressure of -80 kPa.

[0034] The pressure sensor 22 can be integrated onto the main control board 25, and its sensing end can be connected to the inside of the bottle 1 using existing structures such as a gas guide tube. The pressure sensor 22 can be an existing silicon piezoresistive pressure sensor, with a measurement range covering -100kPa to 0kPa, and a response time meeting real-time control requirements. Preferably, the pressure sensor 22 can be configured as a differential pressure sensor, that is, simultaneously setting one sensor to detect the pressure inside the bottle 1 and another sensor to detect atmospheric pressure. The main control board 25 determines the actual negative pressure value by reading the difference between the two sensors, thereby improving measurement accuracy. The pressure sensor 22 can detect the negative pressure value inside the bottle 1 in real time and transmit the detection signal to the main control board 25.

[0035] The conductivity sensor 23 can be installed along the path of the drainage fluid, such as in a drainage tube, to detect the conductivity of the drainage fluid in real time. The drainage tube can refer to a tubing including the aforementioned catheter 9, used to guide exudate from the patient's wound into the bottle 1. The conductivity of the drainage fluid is closely related to its composition: the conductivity of routine serum-like drainage fluid is usually in a low range, while purulent drainage fluid, due to its high content of electrolytes and inflammatory mediators, has a significantly higher conductivity; the conductivity of bloody drainage fluid falls between the two and exhibits specific frequency response characteristics. The conductivity sensor 23 can employ existing electrode or inductive structures, capable of detecting the conductivity value of the drainage fluid in real time and transmitting the detection signal to the main control board 25. The main control board 25 can be preset with corresponding conductivity reference threshold ranges for routine drainage fluid, purulent drainage fluid, and bloody drainage fluid. For example, the conductivity of routine drainage fluid is <10 mS / cm, and the conductivity of purulent drainage fluid is >15 mS / cm (millisiemens per centimeter). These values ​​are just examples and can be adjusted according to clinical calibration.

[0036] The electrically controlled vent valve 24 can be a normally closed solenoid valve, with its inlet connected to the atmosphere and its outlet connected to the inside of the bottle 1. Its opening and closing are controlled by the microcontroller 26 on the main control board 25.

[0037] The microcontroller 26 can be an existing embedded microcontroller used to perform logical functions such as negative pressure closed-loop control, drainage fluid property judgment and threshold update, conflict resolution, and graded leakage detection.

[0038] Further preferably, the microcontroller 26 is also configured to: determine the nature of the drainage fluid using a hysteresis comparison mechanism, the hysteresis comparison mechanism including: setting a first drainage fluid conductivity threshold and a second drainage fluid conductivity threshold, wherein the first drainage fluid conductivity threshold is greater than the second drainage fluid conductivity threshold; when the current drainage fluid state recorded by the microcontroller is normal and the detected drainage fluid conductivity is greater than or equal to the first drainage fluid conductivity threshold, the current drainage fluid state is determined to be purulent; when the current drainage fluid state recorded by the microcontroller is purulent and the detected drainage fluid conductivity is less than or equal to the second drainage fluid conductivity threshold, the current drainage fluid state is determined to be normal; when the drainage fluid conductivity is between the second drainage fluid conductivity threshold and the first drainage fluid conductivity threshold, the current drainage fluid state is determined to remain unchanged.

[0039] Specifically, during drainage treatment, the conductivity of the drainage fluid may fluctuate near the threshold boundary due to changes in patient position, dilution or concentration of wound exudate, or sensor noise.

[0040] It is important to emphasize that without a hysteresis comparison mechanism, when the conductivity fluctuates repeatedly around the purulent threshold (e.g., 15 mS / cm), the microcontroller 26 will frequently switch negative pressure levels, causing the negative pressure pump 21 to start and stop frequently and the electrically controlled vent valve 24 to operate repeatedly. This not only affects the lifespan of the equipment but may also cause patient discomfort. To effectively solve this problem, this embodiment employs a hysteresis comparison mechanism in the microcontroller 26. By setting two different conductivity threshold values ​​(including a first drainage fluid conductivity threshold and a second drainage fluid conductivity threshold), these are used to determine the transition of drainage fluid from normal to purulent and from purulent to normal, respectively. This creates a hysteresis range around the threshold, avoiding boundary oscillations. The microcontroller 26 reads the current conductivity value output by the conductivity sensor 23 at a preset sampling frequency (e.g., once every 10 seconds) and determines and records the current drainage fluid state (normal or purulent). Taking a first drainage fluid conductivity threshold of 15 mS / cm and a second drainage fluid conductivity threshold of 12 mS / cm as an example: Scenario 1 (Transition from Normal to Purulent): The current state of the drainage fluid is recorded as normal. The conductivity of the drainage fluid gradually increases from 10 mS / cm. When the conductivity of the drainage fluid continues to rise and reaches or exceeds the first conductivity threshold of 15 mS / cm, the current state of the drainage fluid is determined to be purulent.

[0041] Scenario 2 (Transition from Purulent to Regular): The current state of the drainage fluid is recorded as purulent. The conductivity of the drainage fluid gradually decreases from 18 mS / cm. When the conductivity of the drainage fluid continues to decrease to the second drainage fluid conductivity threshold of 12 mS / cm or below, it is determined that the current state of the drainage fluid is switched back to regular.

[0042] Scenario 3 (Fluctuation within the hysteresis interval): The current state of the drainage fluid is recorded as normal, with the conductivity fluctuating between 13 and 14 mS / cm. Because it never reaches the first drainage fluid conductivity threshold of 15 mS / cm, the current state of the drainage fluid will not be mistakenly identified as purulent. If the current state of the drainage fluid is determined to be purulent, the conductivity will fluctuate between 13 and 14 mS / cm. Because it does not drop below the second drainage fluid conductivity threshold of 12 mS / cm, the current state of the drainage fluid will not be mistakenly identified as switching back to normal. Therefore, the hysteresis interval effectively absorbs fluctuations near the boundary, preventing frequent switching.

[0043] More preferably, the microcontroller 26 is further configured to: after updating the preset negative pressure threshold range, enter a lock time window, not respond to new changes in the conductivity of the drainage fluid within the lock time window, and exit the lock time window and re-judge after the negative pressure value enters the updated threshold range and the sampled values ​​for a preset number of consecutive times are all within the range.

[0044] Specifically, after determining the new preset negative pressure threshold range based on the conductivity lookup mapping table and updating the preset negative pressure threshold range, the microcontroller 26 immediately enters a locking time window. The length of the locking time window is pre-stored in the microcontroller 26, and in this embodiment, it is exemplarily set to 30 seconds. The length of this locking time window can be adjusted according to the pumping rate of the negative pressure pump 21, the depressurization rate of the electrically controlled vent valve 24, etc., to ensure that most adjustment actions can be completed within the window.

[0045] Within the locked time window, the microcontroller 26 may perform at least one of the following operations: —The conductivity value of the drainage fluid is collected by the conductivity sensor 23, but no threshold query is performed and the preset negative pressure threshold range is updated. That is, the microcontroller 26 ignores any newly collected drainage fluid conductivity data within the window period until the window ends.

[0046] —Continuously acquire the current negative pressure value and perform the following operations: If the current negative pressure value is lower than the new threshold lower limit, open the electronically controlled vent valve 24 to release pressure; if the current negative pressure value is higher than the new threshold upper limit, start the negative pressure pump 21 to pump air.

[0047] The microcontroller 26 exits the lock time window when any of the following conditions are met: —The lockout time window (e.g., 30 seconds) has expired, and the negative pressure has met the requirement that the sampled values ​​for the preset number of consecutive times are all within the updated threshold range. At this point, the microcontroller 26 exits the window and performs operations such as restarting the reading of conductivity, querying the mapping table, and determining whether the threshold needs to be updated again.

[0048] —The lockout time window (e.g., 30 seconds) has expired, but the negative pressure has not yet met the requirements (e.g., due to air leakage or pump malfunction, the negative pressure cannot reach the threshold range). In this case, the microcontroller 26 still forcibly exits the window and re-evaluates the conductivity of the drainage fluid. At the same time, the microcontroller 26 can control the corresponding existing alarm device to issue an alarm prompt to inform medical staff of the abnormal negative pressure regulation.

[0049] More preferably, the microcontroller 26 is further configured to: determine the sealing status of the bottle 1 and the drainage pipeline based on at least two parameters among the negative pressure change rate detected by the pressure sensor 22, the operating power of the negative pressure pump 21, and the start frequency of the negative pressure pump 21. The sealing status includes normal sealing, slight leakage, moderate leakage, and severe leakage. The microcontroller 26 executes graded alarms and corresponding negative pressure compensation actions according to different sealing statuses. The above operation process of the microcontroller 26 can be referred to the specific description of the corresponding control method below, and will not be repeated here.

[0050] More preferably, the automatic negative pressure suction device may further include a drainage flow monitoring module for real-time monitoring of the drainage flow rate per unit time; the microcontroller 26 is also configured to issue a prompt signal when the drainage flow rate is lower than a preset flow rate threshold within a continuous predetermined time.

[0051] Specifically, the drainage volume monitoring module is used to monitor the drainage volume of the drainage fluid per unit time in real time. The drainage volume monitoring can be achieved in a variety of existing ways. For example, the drainage volume monitoring module includes an existing flow sensor. The flow sensor is installed on the drainage pipeline to directly measure the instantaneous flow rate of the drainage fluid and integrate it to obtain the cumulative drainage volume.

[0052] Furthermore, the microcontroller 26 can read data from the drainage monitoring module at fixed time intervals (e.g., every minute) and dynamically accumulate the cumulative drainage volume over different time periods (e.g., 1 hour, 8 hours, and 24 hours). Simultaneously, the microcontroller 26 compares the cumulative drainage volume over the most recent preset time period (e.g., consecutive 24 hours) with a preset flow threshold. When the microcontroller 26 determines that the cumulative drainage volume over the most recent preset time period is lower than the preset flow threshold, it emits a prompt sound through a speaker and displays a text prompt on the screen, such as: "Drainage volume less than 20 ml for 24 consecutive hours; evaluation of extubation indications is recommended." This prompt signal can assist medical personnel in determining whether the time for extubation has been reached, reducing subjective judgment errors. If the subsequent drainage volume returns to normal (exceeding the threshold), the prompt signal stops outputting.

[0053] More preferably, the automatic negative pressure suction device further includes a communication module, which is electrically connected to the main control board and is used to upload the data detected by the pressure sensor and the conductivity sensor, as well as the control data of the microcontroller, to the host computer system.

[0054] Specifically, the communication module can adopt existing structures and communication methods, such as wireless communication. The microcontroller packages the data detected by the pressure sensor and the conductivity sensor, as well as the control data of the microcontroller, and sends them to the host computer system through the communication module according to a preset time interval (e.g., once every 5 minutes) or an event-triggered method (e.g., when an alarm occurs). The host computer system can be a general-purpose computer system suitable for the medical device field in the existing technology.

[0055] According to another aspect of this application, an automatic negative pressure suction system is also provided, please refer to... Figure 3 , Figure 3 A block diagram of an automatic negative pressure suction system according to one embodiment of this application is shown. Figure 3 The automatic negative pressure suction system mainly includes: at least one automatic negative pressure suction device as described above, and a host computer system communicatively connected to the automatic negative pressure suction device. The host computer system may include: Data receiving module 31 is used to receive and store drainage data uploaded by the automatic negative pressure suction device and clinical operation records input by medical staff through the human-machine interface; Storage module 32 is used to store historical drainage data and clinical operation records; The analysis module 33 is used to construct a drainage treatment data model based on stored historical drainage data and clinical operation records, and to analyze the current drainage process based on the drainage treatment data model to generate treatment suggestions or early warning information.

[0056] Specifically, the host computer system can be a server deployed locally in the hospital or a cloud server. The communication network can be one or more of the following: the hospital's internal LAN, Wi-Fi, 4G / 5G mobile communication network, or Ethernet.

[0057] The data receiving module 31 runs on the processor of the host computer system and is responsible for receiving, verifying, parsing, and storing data. Furthermore, the data receiving module 31 includes a web-based human-computer interaction interface. After logging in, medical staff can enter clinical operation records for a specific patient or device. The entry interface can display fields such as patient identification, operation time, and operation type (negative pressure adjustment, sampling and testing, dressing change, tube removal, etc.). After completing the form, the medical staff clicks the submit button, and the front end sends the data to the data receiving module 31, which then verifies and parses the operation record.

[0058] The storage module 32 is the part of the host computer system used for persistent data storage, and can be implemented using a relational database or a time-series database. The analysis module 33 can build a drainage treatment data model based on the historical data in the storage module 32, analyze the real-time drainage process, and generate treatment suggestions or early warning information.

[0059] The aforementioned functional modules of the host computer system can be implemented using known machine learning algorithms or other algorithms suitable for this application.

[0060] According to another aspect of this application, a control method for an automatic negative pressure suction device is also provided, applied to the aforementioned automatic negative pressure suction device. Please refer to [reference needed]. Figure 4 , Figure 4 A flowchart illustrating a control method for an automatic negative pressure suction device according to an embodiment of this application is shown. Figures 1 to 4 The control method of this application includes: Step S101: The negative pressure value inside the bottle is detected in real time by a pressure sensor.

[0061] Specifically, the microcontroller 26 controls the pressure sensor 22 to continuously collect the negative pressure value inside the bottle 1 at a preset sampling frequency (e.g., 1Hz to 10Hz, set to 5Hz in this embodiment). The pressure sensor 22 transmits the detected analog voltage signal to the microcontroller 26 in digital form after analog-to-digital conversion.

[0062] Step S102: When the detected negative pressure value is lower than the lower limit of the preset negative pressure threshold range, the microcontroller starts the negative pressure pump to pump air until the negative pressure value is restored to the preset negative pressure threshold range.

[0063] Specifically, the microcontroller 26 compares the acquired negative pressure value with a pre-stored preset negative pressure threshold range. This negative pressure threshold range includes, for example, a lower limit (the critical value for insufficient negative pressure, e.g., -50 kPa) and an upper limit (the critical value for excessive negative pressure, e.g., -30 kPa). It should be noted that the negative pressure threshold is a negative number. If the current negative pressure threshold is greater than the upper limit, it indicates that the current negative pressure is insufficient, and the absolute value of the negative pressure needs to be increased. At this time, the microcontroller 26 sends a high-level start signal to the drive circuit of the negative pressure pump 21, and the negative pressure pump 21 starts working, drawing gas from the bottle 1.

[0064] During the evacuation process, the microcontroller 26 continuously monitors the current negative pressure value. If the current negative pressure value drops to less than or equal to the upper limit of the preset negative pressure threshold, the microcontroller 26 sends a stop signal to the negative pressure pump 21, and the negative pressure pump 21 stops operating. If the current negative pressure value is already within the negative pressure threshold range, the microcontroller 26 does not perform any operation, and the negative pressure pump 21 remains stationary. If the current negative pressure value is less than the lower limit of the preset negative pressure threshold, it indicates that the absolute value of the negative pressure is too large, but this step does not handle this situation. This step only replenishes the negative pressure and does not actively release the pressure.

[0065] Through the above closed-loop control, the negative pressure inside bottle 1 is maintained within the preset negative pressure threshold range for a long time, ensuring the stability of the drainage suction.

[0066] Step S103: The conductivity of the drainage fluid is detected by a conductivity sensor installed on the path through which the drainage fluid flows.

[0067] Specifically, the microcontroller 26 collects the conductivity value of the drainage fluid through the conductivity sensor 23 at a low sampling frequency (e.g., 0.1Hz to 1Hz, set to once every 10 seconds in this embodiment). The conductivity sensor 23 adopts an electrode structure, and its output signal is linearly related to the ion concentration in the drainage fluid. The microcontroller 26 converts the collected analog signal into a digital signal for storage.

[0068] To avoid misreading due to bubbles or transient interference, the microcontroller 26 can take the median or average of multiple consecutive (e.g., 3) sample values ​​before using them for subsequent judgment.

[0069] In step S104, the microcontroller queries the mapping table based on the conductivity of the drainage fluid to determine the corresponding new preset negative pressure threshold range, and updates the current preset negative pressure threshold range to the new preset negative pressure threshold range.

[0070] Specifically, the microcontroller 26 pre-stores a conductivity-to-negative-voltage threshold mapping table, which defines the direct correspondence between different conductivity ranges and negative-voltage threshold ranges. An example mapping table is recorded as follows: Case 1: The conductivity of the current drainage fluid is less than the first preset conductivity of the drainage fluid. The current drainage fluid is recorded as a normal drainage fluid. The preset negative pressure threshold range is -30kPa to -50kPa. Case 2: The current conductivity of the drainage fluid is between the first preset conductivity and the second preset conductivity. The current properties of the drainage fluid are recorded as diluted or in a transitional state. The preset negative pressure threshold range is -10kPa to -30kPa. Case 3: The conductivity of the current drainage fluid is greater than the second preset conductivity of the drainage fluid. The current drainage fluid is recorded as purulent drainage fluid. The preset negative pressure threshold range is -6kPa to -10kPa.

[0071] The microcontroller 26 queries the mapping table based on the conductivity of the drainage fluid to determine the corresponding new preset negative pressure threshold range, and updates the current preset negative pressure threshold range to the new preset negative pressure threshold range.

[0072] In step S105, the microcontroller compares the current negative pressure value inside the bottle with the updated preset negative pressure threshold range. If the current negative pressure value is lower than the lower limit of the updated preset negative pressure threshold range, the negative pressure pump is stopped and the electronically controlled vent valve is opened to release pressure until the negative pressure value enters the updated preset negative pressure threshold range. If the current negative pressure value is higher than the upper limit of the updated preset negative pressure threshold range, the negative pressure pump is started to pump air until the negative pressure value enters the updated preset negative pressure threshold range.

[0073] Specifically, for example, if the current negative pressure value is lower than the lower limit of the updated preset negative pressure threshold range, the microcontroller 26 first sends a stop signal to the drive circuit of the negative pressure pump 21 (if the negative pressure pump 21 is running), and sends an open signal to the drive circuit of the electrically controlled vent valve 24. The electrically controlled vent valve 24 is a normally closed solenoid valve. After opening, its inlet is connected to the atmosphere, and its outlet is connected to the inside of the bottle. Outside air enters the bottle 1, and the absolute value of the negative pressure inside the bottle 1 gradually decreases. Furthermore, during this period, the microcontroller 26 continuously monitors the current negative pressure value at a high frequency (e.g., 10Hz). When the current negative pressure value enters the updated preset negative pressure threshold range, the microcontroller 26 immediately sends a close signal to the electrically controlled vent valve 24.

[0074] If the current negative pressure value is higher than the updated preset negative pressure threshold, the negative pressure pump is started to pump air until the negative pressure value falls within the updated preset negative pressure threshold range. The microcontroller 26 sends a start signal to the negative pressure pump 21 (if the negative pressure pump 21 has stopped), and the negative pressure pump 21 begins pumping air. The microcontroller 26 continuously monitors the current negative pressure value, and when the current negative pressure value falls within the updated preset negative pressure threshold range, the microcontroller 26 sends a stop signal to the negative pressure pump 21.

[0075] After the above adjustments are completed, in order to ensure the stability of the negative pressure and avoid repeated adjustments due to instantaneous fluctuations in conductivity, the microcontroller 26 executes an anti-oscillation mechanism: the microcontroller 26 starts a locking time window (e.g., 30 seconds). During this time window, the microcontroller 26 ignores the newly acquired drainage fluid conductivity value by the conductivity sensor 23, that is, it does not trigger a new threshold update.

[0076] Meanwhile, the microcontroller 26 continues to monitor the negative pressure value and verify whether it is stable within the new threshold range. The verification method is as follows: the negative pressure value is sampled three times at 1-second intervals. If all three sampled values ​​are within the preset negative pressure threshold range, the negative pressure is determined to be stable; if any sampled value exceeds the range, the negative pressure adjustment operation is repeated.

[0077] After the time window ends, the microcontroller 26 returns to step S103 and restarts the drainage fluid conductivity detection and threshold judgment process.

[0078] Furthermore, according to a preferred embodiment of this application, please refer to... Figure 5 , Figure 5 A flowchart illustrating the steps of another embodiment of the automatic negative pressure suction device control method of this application can also be implemented, according to... Figure 5 The control method may also include: In step S201, the microcontroller acquires and determines the sealing status of the bottle and the drainage pipeline based on at least two parameters among the negative pressure change rate detected by the pressure sensor, the operating power of the negative pressure pump, and the start frequency of the negative pressure pump.

[0079] Specifically, according to Figures 1 to 5 The microcontroller 26 continuously acquires the negative pressure value output by the pressure sensor 22 at a preset sampling frequency (e.g., 10Hz) and stores the pressure value sequence of the most recent 5 seconds. The microcontroller 26 can calculate the pressure change rate using linear regression or differential methods.

[0080] Specifically, regarding the acquisition of the negative pressure change rate, the microcontroller 26 records the negative pressure value at the current moment and the negative pressure value at a predetermined time, and calculates the instantaneous negative pressure change rate using existing calculation methods. To reduce noise interference, the microcontroller 26 can take the average of multiple consecutive instantaneous change rates as the negative pressure change rate used in the current cycle. This parameter reflects the rate at which negative pressure decays due to leakage; the larger the absolute value of the change rate, the more severe the leakage.

[0081] To obtain the operating power of the negative pressure pump 21, the microcontroller 26 can calculate the real-time operating power of the negative pressure pump 21 by monitoring the current and voltage values ​​of the drive circuit of the negative pressure pump 21 and using existing calculation methods. The microcontroller 26 compares the current power with a preset normal power reference value. If the current power is significantly higher than the normal reference value, it indicates that the negative pressure pump 21 needs to compensate for air leakage.

[0082] Specifically, for acquiring the start frequency of the negative pressure pump 21, the microcontroller 26 can internally set a timer and a counter to count the number of times the negative pressure pump 21 starts within a preset time. Each time the microcontroller 26 sends a start command to the negative pressure pump 21 drive circuit, the counter automatically increments by 1. The timer has a 1-hour cycle. At the end of the cycle, the microcontroller 26 stores the count value as the start frequency, then clears the counter and restarts the counting.

[0083] Furthermore, the microcontroller 26 matches the three parameter values ​​(negative pressure change rate, operating power, and start-up frequency) obtained above with a diagnostic rule table pre-stored in the memory. The diagnostic rule table is calibrated by simulating experiments with different levels of leakage (e.g., using leakage valves with different orifice diameters; 0.5mm corresponds to slight leakage, 1mm to moderate leakage, and 2mm to severe leakage). An example rule table record is shown below: Case 1: If the negative pressure change rate is ≤0.2kPa / s, the power of the negative pressure pump is >150% of the reference value, and the starting frequency of the negative pressure pump 21 is ≤5 times / hour, then the diagnosis is: there is a blockage in the automatic negative pressure suction device. Case 2: If the negative pressure change rate is 0.2~0.5kPa / s, the power of the negative pressure pump is ≤110% of the reference value, and the starting frequency of the negative pressure pump 21 is >10 times / hour, then the diagnosis is: there is a slight air leak in the automatic negative pressure suction device. Case 3: If the negative pressure change rate is 0.5~1.0kPa / s, the power of the negative pressure pump is within the range of 111%~150% of the reference value, and the starting frequency of the negative pressure pump 21 is >15 times / hour, then the diagnosis is: there is a moderate air leak in the automatic negative pressure suction device. Case 4: If the negative pressure change rate is >1.0 kPa / s, the power of the negative pressure pump is >150% of the reference value, and the starting frequency of the negative pressure pump 21 is >20 times / hour, then the diagnosis is: there is a serious air leak in the automatic negative pressure suction device.

[0084] Therefore, the microcontroller 26 can execute the following decision logic: —When the negative pressure change rate is ≤0.2 kPa / s and the power is >150% of the baseline value, and the start-up frequency is ≤5 times / hour, the automatic negative pressure suction device is diagnosed as blocked. —When the negative pressure change rate is within the range of 0.2~0.5kPa / s and the start-up frequency is >10 times / hour, even if the power is normal, it is diagnosed as a slight air leak; —When the negative pressure change rate is within the range of 0.5~1.0kPa / s, the power increases to 111%~150% of the reference value, and the start-up frequency is >15 times / hour, it is diagnosed as a moderate leak; —When the negative pressure change rate is >1.0 kPa / s, the power is >150% of the baseline value, the start frequency is >20 times / hour, and the number of times the negative pressure pump 21 is started accounts for more than 80% of the time period in the last 30 minutes, it is diagnosed as a serious air leak.

[0085] Furthermore, if the three parameters simultaneously meet the triggering conditions of multiple rules, the microcontroller 26 selects the diagnostic conclusion according to the priority of severe air leakage > moderate air leakage > slight air leakage > blockage of the automatic negative pressure suction device.

[0086] In step S202, the microcontroller executes a graded alarm and corresponding negative pressure compensation action based on the judgment result of the sealing state.

[0087] Specifically, according to Figures 1 to 5 When a minor air leak is diagnosed, the microcontroller 26 performs the following operations: The microcontroller 26 emits a low-frequency alert sound, such as a buzzer, every 5 seconds, while simultaneously driving an LED indicator to flash at the same frequency and displaying the text message: "Minor air leak detected. Please check the piping connections." Furthermore, the microcontroller 26 changes the operating mode of the negative pressure pump 21 from continuous operation until a threshold limit is reached to intermittent operation.

[0088] When a moderate air leak is diagnosed, the microcontroller 26 performs the following operations: it drives the buzzer to emit a high-frequency warning sound, simultaneously drives the LED indicator to flash rapidly, and drives the display screen to show the text message: "Moderate air leak detected. Please check the leak point as soon as possible." Furthermore, the microcontroller 26 also controls the negative pressure pump 21 to increase its drive power to 120% of its normal power.

[0089] When a serious air leak is diagnosed, the microcontroller 26 performs the following operations: it drives the display screen to show the text message: "Serious air leak, please check the negative pressure system immediately," and drives the buzzer to emit a continuous high-frequency beeping sound. Furthermore, the microcontroller 26 also controls the negative pressure pump 21 to increase its drive power to the maximum power, ensuring its continuous and uninterrupted operation.

[0090] The automatic negative pressure suction device, system, and control method provided by this invention can be widely applied to postoperative wound negative pressure drainage treatment in clinical departments such as trauma surgery, orthopedics, general surgery, and burn surgery. The device is compact, easy to operate, and fully functional, possessing several innovative features including automatic maintenance of negative pressure, adaptive adjustment of negative pressure levels, graded leak detection and alarm, drainage volume monitoring and alerts, non-destructive sampling, and remote data transmission and analysis. It has significant industrial practical value and promising market prospects.

[0091] It should be noted that the above description is only of the preferred embodiments of the present invention. All equivalent alternatives or obvious modifications of the embodiments given in the specification that can be reasonably predicted by those skilled in the art to achieve the purpose of the present invention are also included within the protection scope of the present invention.

[0092] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention.

[0093] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An automatic negative pressure suction device, characterized in that, include: A bottle for storing negative pressure and collecting drainage fluid, a drainage pipe connected to the bottle, and an equipment compartment located above the bottle, the equipment compartment housing a negative pressure pump, a pressure sensor, a conductivity sensor, an electrically controlled vent valve, and a main control board; wherein, the suction port of the negative pressure pump is connected to the inside of the bottle to extract gas from the bottle to create negative pressure; the pressure sensor is used to detect the negative pressure value inside the bottle and transmit the detection signal to the main control board; the conductivity sensor is used to detect the conductivity of the drainage fluid and transmit the detection signal to the main control board; the electrically controlled vent valve is connected to the inside of the bottle to introduce outside air to reduce the absolute value of the negative pressure; a microcontroller is installed on the main control board, the microcontroller is electrically connected to the negative pressure pump, the pressure sensor, the conductivity sensor, and the electrically controlled vent valve, the microcontroller has a pre-stored mapping table of conductivity and preset negative pressure threshold range, and the microcontroller is configured as follows: Based on the comparison result between the negative pressure value detected by the pressure sensor and the preset negative pressure threshold range, the start and stop of the negative pressure pump are controlled to maintain the negative pressure in the bottle within the preset negative pressure threshold range. Based on the conductivity of the drainage fluid detected by the conductivity sensor, the corresponding new preset negative pressure threshold range is determined by querying the mapping table, and the current preset negative pressure threshold range is updated to the new preset negative pressure threshold range; After updating the preset negative pressure threshold range, the current negative pressure value inside the bottle is compared with the updated preset negative pressure threshold range. If the current negative pressure value is lower than the lower limit of the updated preset negative pressure threshold range, the negative pressure pump is stopped and the electronically controlled vent valve is opened to release pressure until the negative pressure value enters the updated preset negative pressure threshold range. If the current negative pressure value is higher than the upper limit of the updated preset negative pressure threshold range, the negative pressure pump is started to pump air until the negative pressure value enters the updated preset negative pressure threshold range.

2. The negative pressure suction device according to claim 1, characterized in that, The microcontroller is further configured to: determine the nature of the drainage fluid using a hysteresis comparison mechanism, the hysteresis comparison mechanism including: setting a first drainage fluid conductivity threshold and a second drainage fluid conductivity threshold, wherein the first drainage fluid conductivity threshold is greater than the second drainage fluid conductivity threshold; when the current drainage fluid state recorded by the microcontroller is normal and the detected drainage fluid conductivity is greater than or equal to the first drainage fluid conductivity threshold, the current drainage fluid state is determined to be purulent; when the current drainage fluid state recorded by the microcontroller is purulent and the detected drainage fluid conductivity is less than or equal to the second drainage fluid conductivity threshold, the current drainage fluid state is determined to be normal; when the drainage fluid conductivity is between the second drainage fluid conductivity threshold and the first drainage fluid conductivity threshold, the current drainage fluid state is determined to remain unchanged.

3. The negative pressure suction device according to claim 1, characterized in that, The microcontroller is further configured to: after updating the preset negative pressure threshold range, enter a lock time window, not respond to new changes in the conductivity of the drainage fluid within the lock time window, and exit the lock time window and re-evaluate after the negative pressure value enters the updated preset negative pressure threshold range and the sampled values ​​are within the threshold range for a preset number of consecutive times.

4. The negative pressure suction device according to claim 1, characterized in that, The microcontroller is also configured to: determine the sealing status of the bottle and the drainage pipeline based on at least two parameters among the negative pressure change rate detected by the pressure sensor, the operating power of the negative pressure pump, and the start frequency of the negative pressure pump. The sealing status includes normal sealing status, slight leakage status, moderate leakage status, and severe leakage status. The microcontroller executes graded alarms and corresponding negative pressure compensation actions according to different sealing statuses.

5. The negative pressure suction device according to claim 1, characterized in that, The device also includes a drainage volume monitoring module for real-time monitoring of the drainage volume of the drainage fluid per unit time; the microcontroller is further configured to issue a prompt signal when the drainage volume is lower than a preset flow threshold within a continuous predetermined time.

6. The negative pressure suction device according to claim 1, characterized in that, The negative pressure suction device also includes a communication module, which is electrically connected to the main control board and is used to upload the data detected by the pressure sensor and the conductivity sensor, as well as the control data of the microcontroller, to the host computer system.

7. An automatic negative pressure suction system, characterized in that, include: At least one automatic negative pressure suction device as described in any one of claims 1-6, and a host computer system communicatively connected to the automatic negative pressure suction device, the host computer system comprising: The data receiving module is used to receive and store the drainage data uploaded by the automatic negative pressure suction device and the clinical operation records entered by medical staff through the human-machine interface. The storage module is used to store historical drainage data and clinical operation records; The analysis module is used to construct a drainage treatment data model based on the stored historical drainage data and the clinical operation records, and to analyze the current drainage process based on the drainage treatment data model to generate treatment suggestions or early warning information.

8. A control method for an automatic negative pressure suction device, applied to the automatic negative pressure suction device according to any one of claims 1-6, characterized in that, include: The negative pressure value inside the bottle is detected by the pressure sensor; When the detected negative pressure value is lower than the lower limit of the preset negative pressure threshold range, the microcontroller starts the negative pressure pump to pump air until the negative pressure value is restored to the preset negative pressure threshold range. The conductivity of the drainage fluid is detected by the conductivity sensor. The microcontroller determines the corresponding new preset negative pressure threshold range by querying the mapping table based on the conductivity of the drainage fluid, and updates the current preset negative pressure threshold range to the new preset negative pressure threshold range; The microcontroller compares the current negative pressure value inside the bottle with the updated preset negative pressure threshold range. If the current negative pressure value is lower than the lower limit of the updated preset negative pressure threshold range, the negative pressure pump is stopped and the electronically controlled vent valve is opened to release pressure until the negative pressure value enters the updated preset negative pressure threshold range. If the current negative pressure value is higher than the upper limit of the updated preset negative pressure threshold range, the negative pressure pump is started to pump air until the negative pressure value enters the updated preset negative pressure threshold range.

9. The control method according to claim 8, characterized in that, Also includes: The microcontroller acquires and determines the sealing status of the bottle and the drainage pipeline based on at least two parameters among the negative pressure change rate detected by the pressure sensor, the operating power of the negative pressure pump, and the start frequency of the negative pressure pump. Based on the judgment result of the sealing status, the microcontroller executes graded alarms and corresponding negative pressure compensation actions.

Images