A method for stabilizing pressure and flow rate control of a pneumoperitoneum machine without a flow meter

Abstract

The present invention discloses a method for stabilizing pressure and flow rate control of a pneumoperitoneum machine without a flow meter, including: obtaining a first current pressure and calculating a first difference between the first current pressure and a set pressure; if the first current pressure is less than the set pressure, selecting a preset first flow algorithm to control the inflation valve according to the first difference, and re-judging the difference after the preset first flow algorithm is executed, and repeating pressurization until the set pressure is reached; if the first current pressure is greater than the set pressure, selecting a preset second flow algorithm to control the deflation valve according to the first difference, and re-judging the difference after the preset second flow algorithm is executed, and repeating pressure relief until the set pressure is reached; wherein, the preset first flow algorithm and the preset second flow algorithm are preset and dynamically adjusted according to the parameters of the inflation valve and the deflation valve. The present invention no longer uses a flow proportional valve or a flow meter to control the flow rate, and utilizes the response speed of the algorithm to improve the air pressure adjustment efficiency and reduce air pressure fluctuations.

Description

Technical Field

[0001] The present invention relates to the field of pneumoperitoneum machine control, and particularly to a method for controlling the stable pressure and stable flow of a pneumoperitoneum machine without a flowmeter. Background Art

[0002] Existing pneumoperitoneum machines use flow proportional valves to control the flow rate and pressure. During the operation of the pneumoperitoneum machine, a pressure value and a flow rate value are set, and then, according to the difference between the actual pressure and the set maximum pressure, the proportional valve of the pneumoperitoneum machine is controlled in real time until the measured pressure reaches the desired pressure.

[0003] However, there will be a delay in the data transmission of the flow proportional valve. It takes 90 s for the displacement from the minimum orifice to the maximum orifice of the proportional valve, and the general speed is 0.2 mm / s, so the real-time performance cannot be guaranteed, which may lead to overshoot or over-discharge of gas.

[0004] Therefore, the prior art relies on the flow proportional valve for control, resulting in a slow response speed, unable to adjust the valve flow rate in time, and causing large fluctuations in air pressure. Summary of the Invention

[0005] Aiming at the problem that the prior art relies on the flow proportional valve for control, resulting in a slow response speed, the present invention provides a method for controlling the stable pressure and stable flow of a pneumoperitoneum machine without a flowmeter. By presetting a first flow algorithm and a second flow algorithm, the inflation valve or deflation valve is controlled according to the currently obtained current pressure in real time. There is no need for a flow proportional valve or a flowmeter, the response speed is greatly improved, the air pressure can be quickly adjusted, and the air pressure fluctuation can be reduced.

[0006] The following is the technical solution of the present invention.

[0007] A method for controlling the stable pressure and stable flow of a pneumoperitoneum machine without a flowmeter includes the following steps:

[0008] Obtain the first current pressure, and calculate the first difference between the first current pressure and the set pressure;

[0009] If the first current pressure is less than the set pressure, select the preset first flow algorithm according to the first difference to control the inflation valve, and re-judge the difference after the preset first flow algorithm is executed, and repeat the pressurization until the set pressure is reached;

[0010] If the first current pressure is greater than the set pressure, select the preset second flow algorithm according to the first difference to control the deflation valve, and re-judge the difference after the preset second flow algorithm is executed, and repeat the pressure relief until the set pressure is reached;

[0011] Wherein, the preset first flow algorithm and the preset second flow algorithm are preset and dynamically adjusted according to the parameters of the inflation valve and the deflation valve.

[0012] The present invention calculates a first difference based on a first current pressure and a set pressure, selects to execute a preset first flow algorithm or a preset second flow algorithm according to the first difference, and makes dynamic adjustments in a timely manner. It no longer uses a flow ratio valve or a flowmeter, and improves the air pressure adjustment efficiency by using the response speed of the program, reducing air pressure fluctuations.

[0013] Preferably, after the execution of the preset first flow algorithm, it further includes: obtaining a second current pressure, calculating a leakage coefficient according to a second difference between the second current pressure and the set pressure; selecting the preset first flow algorithm according to the second difference and making adjustments according to the leakage coefficient, and controlling the inflation valve by using the adjusted preset first flow algorithm.

[0014] The present invention adjusts the preset first flow algorithm through the leakage coefficient, can dynamically adjust the control mode during the working process, and accurately control the air pressure.

[0015] Preferably, calculating the leakage coefficient according to the second difference between the second current pressure and the set pressure, selecting the preset second flow algorithm according to the second difference and making adjustments according to the leakage coefficient includes: calculating the ratio of the second difference to the previous valve opening duration to obtain the leakage coefficient, using the leakage coefficient to adjust the preset first flow algorithm, calculating a comprehensive difference from the second difference and the leakage coefficient, and inputting the comprehensive difference into the adjusted preset first flow algorithm to control the inflation valve.

[0016] Preferably, using the leakage coefficient to adjust the preset first flow algorithm and calculating a comprehensive difference from the second difference and the leakage coefficient includes:

[0017] Multiplying the leakage coefficient by the set pressure increasing time limit to obtain a leakage compensation value, and adding the leakage compensation value to the second difference to obtain the comprehensive difference.

[0018] The comprehensive difference of the present invention compensates for the air pressure change caused by leakage to a certain extent, and can more accurately select a suitable pressure increasing scheme in the preset first flow algorithm.

[0019] Preferably, the setting process of the preset first flow algorithm includes:

[0020] Performing pressure increasing scheme setting before the pneumoperitoneum machine officially works: obtaining the change relationship function or chart between the valve opening duration and the air pressure of each inflation valve according to the air pressure change generated by each inflation valve during the valve opening period, and the change relationship function or chart between the valve opening duration and the air pressure of each combination of inflation valves;

[0021] During the official working process of the pneumoperitoneum machine, when the air pressure difference is obtained, substituting the difference into the change relationship function or chart to obtain the theoretical valve opening duration of each combination of inflation valves or the theoretical valve opening duration of each inflation valve;

[0022] According to the set pressurization time limit, select a pressurization scheme with an opening valve duration less than and closest to the pressurization time limit to control the inflation valve.

[0023] Since there is usually more than one inflation valve, there are multiple combinations of inflation valves. Calculate in advance the relationship function or chart between the opening valve duration of all combinations of inflation valves and individual inflation valves and the change in air pressure. After obtaining the actual difference, directly substitute it to obtain the opening valve duration of different schemes; selecting a pressurization scheme with an opening valve duration less than and closest to the pressurization time limit to control the inflation valve can ensure the planning of air pressure regulation to the greatest extent, and there will be no situation where the air pressure changes too fast or too slow.

[0024] Preferably, the setting process of the preset second flow algorithm includes:

[0025] Before the pneumoperitoneum machine officially works, set the pressure relief scheme: According to the air pressure change generated by each deflation valve during the opening valve period, obtain the relationship function or chart between the opening valve duration of each deflation valve and the air pressure change, and the relationship function or chart between the opening valve duration of each combination of deflation valves and the air pressure change;

[0026] During the official operation of the pneumoperitoneum machine, when the difference in air pressure is obtained, substitute the difference into the relationship function or chart to obtain the theoretical opening valve duration of each combination of deflation valves or the theoretical opening valve duration of each deflation valve;

[0027] According to the set pressure relief time limit, select a pressure relief scheme with an opening valve duration less than and closest to the pressure relief time limit to control the deflation valve.

[0028] Preferably, the step of selecting a pressurization scheme with an opening valve duration less than and closest to the pressurization time limit to control the inflation valve according to the set pressurization time limit includes:

[0029] If the selected pressurization scheme is executed by a combination of inflation valves, calculate the time difference between the opening valve duration and the pressurization time limit. This time difference is used as the closing valve duration. The opening valve duration and closing valve duration of each inflation valve in the inflation valve combination remain unchanged, and the opening and closing moments of each inflation valve are staggered within the pressurization time limit.

[0030] When the present invention uses a combination of inflation valves to execute the pressurization scheme, since the opening valve duration is generally less than the pressurization time limit, there is a time difference. By staggering the opening and closing moments of each inflation valve with this time difference, the degree of air pressure mutation can be reduced, which is beneficial to stabilizing the air pressure.

[0031] Preferably, the step of selecting a pressure relief scheme with an opening valve duration less than and closest to the pressure relief time limit to control the deflation valve according to the set pressure relief time limit includes:

[0032] If the selected pressure relief solution is implemented by a combination of bleed valves, calculate the time difference between the valve opening duration and the pressure relief time limit. This time difference is used as the valve closing duration. The valve opening duration and valve closing duration of each bleed valve in the bleed valve combination remain unchanged, and the opening and closing times of each bleed valve are staggered within the pressure relief time limit.

[0033] The substantial effects of the present invention include:

[0034] The present invention calculates the first difference based on the first current pressure and the set pressure, selects to execute the preset first flow algorithm or the preset second flow algorithm according to the first difference, and makes dynamic adjustments in a timely manner. It no longer uses a flow ratio valve or a flow meter, and improves the air pressure adjustment efficiency by using the response speed of the program and reduces the air pressure fluctuation.

[0035] The present invention adjusts the preset first flow algorithm through the air leakage coefficient, can dynamically adjust the control method during the working process, and accurately controls the air pressure. The comprehensive difference of the present invention compensates for the air pressure change caused by air leakage to a certain extent, and can more accurately select a suitable pressurization solution in the preset first flow algorithm.

[0036] The present invention pre-calculates the relationship function or chart between the opening duration of all inflation valve combinations and individual inflation valves and the change of air pressure. After obtaining the actual difference, the opening duration of different solutions can be directly obtained by substituting it. Selecting a pressurization solution with an opening duration less than and closest to the pressurization time limit to control the inflation valve can ensure the planning of air pressure adjustment to the greatest extent, and there will be no situation where the air pressure changes too fast or too slow.

[0037] When the present invention uses an inflation valve combination to execute the pressurization solution, since the valve opening duration is generally less than the pressurization time limit, there is a time difference. By staggering the opening and closing times of each inflation valve with this time difference, the degree of air pressure mutation can be reduced, which is beneficial to stabilizing the air pressure. Description of the Drawings

[0038] Figure 1 is a flowchart of an embodiment of the present invention. Detailed Embodiments

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will describe the technical solutions clearly and completely in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] It should be understood that in various embodiments of the present invention, the magnitudes of the serial numbers of the various processes do not mean the order of execution is prior or subsequent. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0041] It should be understood that in the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0042] It should be understood that in the present invention, "a plurality of" means two or more. "And / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "Including A, B and C", "including A, B, C" means that all of A, B, and C are included, "including A, B or C" means including any one of A, B, and C, and "including A, B and / or C" means including any one or any two or all three of A, B, and C.

[0043] The technical solution of the present invention will be described in detail below with specific embodiments. The embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0044] Embodiment:

[0045] A method for stabilizing pressure and flow rate control of a pneumoperitoneum machine without a flow meter, including the following steps as Figure 1 shown:

[0046] Obtain the first current pressure and calculate the first difference between the first current pressure and the set pressure.

[0047] If the first current pressure is less than the set pressure, select a preset first flow algorithm to control the inflation valve according to the first difference, and re-judge the difference after the preset first flow algorithm is executed, and repeat the pressurization until the set pressure is reached.

[0048] If the first current pressure is greater than the set pressure, select a preset second flow algorithm to control the deflation valve according to the first difference, and re-judge the difference after the preset second flow algorithm is executed, and repeat the pressure relief until the set pressure is reached.

[0049] Wherein, the preset first flow algorithm and the preset second flow algorithm are pre-set and dynamically adjusted according to the parameters of the inflation valve and the deflation valve.

[0050] In this embodiment, the setting process of the preset first flow algorithm includes:

[0051] Set the pressurization scheme before the pneumoperitoneum machine works officially: According to the air pressure changes generated by each inflation valve during the valve opening period, obtain the function or graph of the relationship between the valve opening duration and air pressure of each inflation valve, as well as the function or graph of the relationship between the valve opening duration and air pressure of each combination of inflation valves;

[0052] During the official operation of the pneumoperitoneum machine, when the difference in air pressure is obtained, substitute the difference into the above-mentioned function or graph of the relationship to obtain the theoretical valve opening duration of each combination of inflation valves or the theoretical valve opening duration of each inflation valve;

[0053] According to the set pressurization time limit, select the pressurization scheme with a valve opening duration less than and closest to the pressurization time limit to control the inflation valve. If the selected pressurization scheme is executed by a combination of inflation valves, calculate the time difference between the valve opening duration and the pressurization time limit, and this time difference is used as the valve closing duration. The valve opening duration and valve closing duration of each inflation valve in the combination of inflation valves remain unchanged, and the opening and closing moments of each inflation valve are staggered within the pressurization time limit.

[0054] Since there is usually more than one inflation valve, there are multiple combinations of inflation valves. Calculate the function or graph of the relationship between the valve opening duration and air pressure of all combinations of inflation valves and individual inflation valves in advance, and directly substitute the actual difference to obtain the valve opening duration of different schemes; and selecting the pressurization scheme with a valve opening duration less than and closest to the pressurization time limit to control the inflation valve can ensure the planning of air pressure adjustment to the greatest extent, and there will be no situation where the air pressure changes too fast or too slow.

[0055] The function or graph of the relationship between the valve opening duration and air pressure in this embodiment is measured based on pre-experimental tests. Taking the most basic combination of inflation valves as an example, if intake valve 1 and intake valve 2 are used, the flow rate of intake valve 1 is F1 L / min, the valve opening time is M1 ms, the valve closing time is N1 ms, the flow rate of intake valve 2 is F2 L / min, the valve closing time is N2 ms, and then the valve opening time is M2 ms, where M2>M1, N2<N1, M1+N1 = M2+N2, then within the time of M2, the actual flow rate is (F1*(M1 / 1000 / 60)+F2*(M2 / 1000 / 60)) / M2.

[0056] In this embodiment, when using a combination of inflation valves to execute the pressurization scheme, since the valve opening duration is generally less than the pressurization time limit, there is a time difference, and by staggering the opening and closing moments of each inflation valve with this time difference, the degree of air pressure mutation can be reduced, which is beneficial to stabilizing the air pressure.

[0057] Meanwhile, in this embodiment, the setting process of the preset second flow algorithm includes:

[0058] Before the pneumoperitoneum machine works officially, set the pressure relief plan: according to the air pressure changes generated by each air release valve during the valve opening period, obtain the function or chart of the relationship between the valve opening duration and air pressure change of each air release valve, and the function or chart of the relationship between the valve opening duration and air pressure change of each combination of air release valves;

[0059] During the official operation of the pneumoperitoneum machine, when the pressure difference is obtained, substitute the difference into the said function or chart of the change relationship to obtain the theoretical valve opening duration of each combination of air release valves or the theoretical valve opening duration of each air release valve;

[0060] According to the set pressure relief time limit, select the pressure relief plan with a valve opening duration less than and closest to the pressure relief time limit to control the air release valve. If the selected pressure relief plan is executed by a combination of air release valves, calculate the time difference between the valve opening duration and the pressure relief time limit, and use this time difference as the valve closing duration. The valve opening duration and valve closing duration of each air release valve in the combination of air release valves remain unchanged, and the opening and closing times of each air release valve are staggered within the pressure relief time limit.

[0061] In addition, after the preset first flow algorithm is executed in this embodiment, it further includes: obtaining the second current pressure, calculating the air leakage coefficient according to the second difference between the second current pressure and the set pressure; selecting the preset first flow algorithm according to the second difference and adjusting it according to the air leakage coefficient, and using the adjusted preset first flow algorithm to control the inflation valve.

[0062] Specifically: calculate the ratio of the second difference to the previous valve opening duration to obtain the air leakage coefficient, use the air leakage coefficient to adjust the preset first flow algorithm, multiply the air leakage coefficient by the set pressure increase time limit to obtain the air leakage compensation value, add the air leakage compensation value to the second difference to obtain the comprehensive difference, and input the comprehensive difference into the adjusted preset first flow algorithm to control the inflation valve.

[0063] In this embodiment, the preset first flow algorithm is adjusted by the air leakage coefficient, which can dynamically adjust the control method during the operation process and accurately control the air pressure. To a certain extent, the comprehensive difference compensates for the air pressure change caused by air leakage, and can more accurately select the appropriate pressure increase plan in the preset first flow algorithm.

[0064] Through the description of the above embodiments, those skilled in the art can understand that for the convenience and simplicity of description, only the above-mentioned division of each functional module is used as an example. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the specific device is divided into different functional modules to complete all or part of the functions described above.

[0065] In the embodiments provided in this application, it should be understood that the disclosed structures and methods can be implemented in other ways. For example, the embodiments of the structures described above are merely illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another structure, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections between each other can be through some interfaces, and the indirect couplings or communication connections of structures or units can be in electrical, mechanical or other forms.

[0066] The units described as separate components may or may not be physically separated. The components displayed as units may be one physical unit or multiple physical units, that is, they can be located in one place, or they can be distributed to multiple different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0067] In addition, each functional unit in the embodiments of this application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0068] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to enable a device (which can be a single-chip microcomputer, a chip, etc.) or a processor to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read only memory (ROM), random access memory (RAM), magnetic disks or optical discs and other various media that can store program codes.

[0069] The above content is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all of them should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A method for controlling the stable pressure and stable flow of a pneumoperitoneum machine without a flow meter, characterized in that, It includes the following steps: Obtain the first current pressure and calculate the first difference between the first current pressure and the set pressure; If the first current pressure is less than the set pressure, select a preset first flow algorithm according to the first difference to control the inflation valve, and re-judge the difference after the preset first flow algorithm is executed, and repeat the pressurization until the set pressure is reached; If the first current pressure is greater than the set pressure, select a preset second flow algorithm according to the first difference to control the deflation valve, and re-judge the difference after the preset second flow algorithm is executed, and repeat the pressure relief until the set pressure is reached; Among them, the preset first flow algorithm and the preset second flow algorithm are pre-set and dynamically adjusted according to the parameters of the inflation valve and the deflation valve; After the preset first flow algorithm is executed, it further includes: obtaining the second current pressure, calculating the air leakage coefficient according to the second difference between the second current pressure and the set pressure; selecting the preset first flow algorithm according to the second difference and adjusting it according to the air leakage coefficient, and using the adjusted preset first flow algorithm to control the inflation valve.

2. A method for controlling the stable pressure and stable flow of a pneumoperitoneum machine without a flow meter according to claim 1, characterized in that The calculating the air leakage coefficient according to the second difference between the second current pressure and the set pressure, selecting the preset second flow algorithm according to the second difference and adjusting it according to the air leakage coefficient includes: calculating the ratio of the second difference to the previous valve opening duration to obtain the air leakage coefficient, using the air leakage coefficient to adjust the preset first flow algorithm, calculating the comprehensive difference from the second difference and the air leakage coefficient, and inputting the comprehensive difference into the adjusted preset first flow algorithm to control the inflation valve.

3. A method for controlling the pressure and flow rate stability of a pneumoperitoneum machine without a flow meter according to claim 2, characterized in that, The using the air leakage coefficient to adjust the preset first flow algorithm and calculating the comprehensive difference from the second difference and the air leakage coefficient includes: Multiplying the air leakage coefficient by the set pressurization time limit to obtain an air leakage compensation value, and adding the air leakage compensation value to the second difference to obtain the comprehensive difference.

4. A method for controlling the pressure and flow rate stability of a pneumoperitoneum machine without a flow meter according to claim 1 or 2, characterized in that, The setting process of the preset first flow algorithm includes: Before the pneumoperitoneum machine officially works, perform a pressurization scheme setting: according to the air pressure change generated by each inflation valve during the valve opening period, obtain the function or chart of the valve opening duration and air pressure change relationship of each inflation valve, and the function or chart of the valve opening duration and air pressure change relationship of each combination of inflation valves; During the formal operation of the pneumoperitoneum machine, when the air pressure difference is obtained, substitute the difference into the function or chart of the change relationship to obtain the theoretical valve opening duration of each combination of inflation valves or the theoretical valve opening duration of each inflation valve; According to the set pressurization time limit, select a pressurization scheme with a valve opening duration less than and closest to the pressurization time limit to control the inflation valve.

5. A method for controlling the pressure and flow rate stability of a pneumoperitoneum machine without a flow meter according to claim 1 or 2, characterized in that, The setting process of the preset second flow algorithm includes: Before the pneumoperitoneum machine officially works, perform a pressure relief scheme setting: according to the air pressure change generated by each deflation valve during the valve opening period, obtain the function or chart of the valve opening duration and air pressure change relationship of each deflation valve, and the function or chart of the valve opening duration and air pressure change relationship of each combination of deflation valves; During the formal operation of the pneumoperitoneum machine, when the air pressure difference is obtained, substitute the difference into the function or chart of the change relationship to obtain the theoretical valve opening duration of each combination of deflation valves or the theoretical valve opening duration of each deflation valve; According to the set pressure relief time limit, select a pressure relief scheme with a valve opening duration less than and closest to the pressure relief time limit to control the deflation valve.

6. A method for controlling the stable pressure and stable flow of a pneumoperitoneum machine without a flow meter according to claim 4, characterized in that, According to the set supercharging time limit, select a supercharging scheme with an opening valve duration less than and closest to the supercharging time limit to control the charging valve, including: If the selected supercharging scheme is executed by a charging valve combination, calculate the time difference between the opening valve duration and the supercharging time limit, and use this time difference as the closing valve duration. The opening valve duration and closing valve duration of each charging valve in the charging valve combination remain unchanged, and the opening and closing moments of each charging valve are staggered within the supercharging time limit.

7. A method for controlling the stable pressure and stable flow of a pneumoperitoneum machine without a flowmeter according to claim 5, characterized in that, According to the set pressure relief time limit, select a pressure relief scheme with an opening valve duration less than and closest to the pressure relief time limit to control the air release valve, including: If the selected pressure relief scheme is executed by an air release valve combination, calculate the time difference between the opening valve duration and the pressure relief time limit, and use this time difference as the closing valve duration. The opening valve duration and closing valve duration of each air release valve in the air release valve combination remain unchanged, and the opening and closing moments of each air release valve are staggered within the pressure relief time limit.

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