Double-horizontal-mode pipeline ponding detection method for respiratory support equipment

Abstract

The invention discloses a double-horizontal-mode pipeline ponding detection method for respiratory support equipment. The method comprises the following steps that CNT1 and CNT2 counts are set; judging whether the patient enters an inspiration state; turning points of the flow are obtained in real time, whether the pipeline ponding oscillation frequency coincides with the breathing signal frequency or not is judged according to the flow of the adjacent turning points, and 1 is added to the CNT1 count; setting a CNT1 counting threshold value, setting Flagflow to 1 if the oscillation frequency in the unit suction period is greater than the CNT1 counting threshold value, and otherwise, setting Flagflow to 0; turning points of pressure are obtained in real time, whether the pipeline accumulated water oscillation frequency coincides with the breathing signal frequency or not is judged according to the pressure of the adjacent turning points, and 1 is added to the CNT2 count; a CNT2 counting threshold value is set, if the oscillation frequency in the unit suction period is larger than the CNT2 counting threshold value, Flagpress is set to be 1, and otherwise, Flagpress is set to be 0; if the Flagflow and the Flagpress are both set to be 0, it is judged that the pipeline of the respiratory support equipment is in the ponding event. According to the invention, the technical problem of how to accurately and quickly judge the pipeline water accumulation condition of the respiratory support equipment in the dual modes is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of respiratory support equipment, and in particular to a method for detecting water accumulation in dual-level mode pipelines of respiratory support equipment. Background Art

[0002] In modern clinical medicine, respiratory support equipment, as an effective means of artificially replacing the autonomous ventilation function, is widely used in respiratory failure caused by various reasons, anesthesia respiratory management during major surgery, respiratory support feeding and emergency resuscitation, and occupies a very important position in the field of modern medicine. Respiratory support equipment is a vital medical device that can prevent and treat respiratory failure, reduce complications, and save and prolong the life of patients. Respiratory support equipment is divided into two categories: invasive respiratory support equipment and respiratory support equipment. Invasive respiratory support equipment requires the establishment of artificial airways such as oral or nasal endotracheal intubation and tracheotomy tubes to ventilate patients through artificial airways; while respiratory support equipment usually uses a mask to complete the function of mechanical ventilation. With the continuous development of medical device technology, users have higher and higher requirements for the intelligence of medical devices. The management of water accumulation in respiratory support equipment brings certain hidden dangers to the mechanical ventilation of the viewer. When the water accumulation is serious, it will cause false triggering and even lung infection. The patent document with application number CN202110287474.9 discloses a ventilator pipeline water accumulation alarm, comprising a ventilation tube, a joint, a monitoring device and a central processing unit; both ends of the ventilation tube are provided with joints for corresponding communication with the ventilator pipeline, a monitoring device for monitoring the airflow in the ventilation tube is provided in the middle of the ventilation tube body, and a monitoring device for processing the monitoring device is provided on the side of the ventilation tube body corresponding to the monitoring device The central processor of the device monitors the signal, and a buzzer alarm device is provided at the position corresponding to the central processor; the monitoring device includes a rocker, a choke ring and a thin film pressure sensor, and the ventilation tube body is provided with a chamber I on one side corresponding to the position of the monitoring device, and a chamber II on the other side. The monitoring device monitors in real time whether there is water accumulation in the ventilator pipeline. When the central processor detects water accumulation in the ventilator pipeline, it can immediately trigger the buzzer alarm device to send out an alarm message to remind medical staff to deal with it in time. This scheme does not distinguish other situations of unstable flow rate, which also include sudden changes in air leakage, patient coughing, etc., and the pressure of the patient changes in real time when the patient is in the dual-level ventilation mode. Therefore, it is urgent to propose a method for detecting water accumulation in the dual-level mode pipeline of a respiratory support device to solve the technical problem of how to accurately and quickly judge the water accumulation in the dual-mode pipeline of a respiratory support device. Summary of the invention

[0003] The main purpose of the present invention is to propose a method for detecting water accumulation in dual-level mode pipelines of a respiratory support device, aiming to solve the technical problem of how to accurately and quickly judge the water accumulation in the pipelines of a respiratory support device in dual mode.

[0004] To achieve the above object, the present invention provides a method for detecting water accumulation in a dual-level mode pipeline of a respiratory support device, wherein the method for detecting water accumulation in a dual-level mode pipeline of a respiratory support device comprises the following steps:

[0005] S1, set CNT1 and CNT2 counts and initialize;

[0006] S2, determining whether the patient has entered the inhalation state, if so, executing step S3;

[0007] S3. Obtain the turning point of the flow in real time, and determine whether the oscillation frequency of the pipeline water accumulation coincides with the respiratory signal frequency based on the flow of the adjacent turning points, and add 1 to the CNT1 count; set the CNT1 count threshold, if the oscillation frequency in the unit inhalation cycle is greater than the CNT1 count threshold, set Flagflow to 1, otherwise, set Flagflow to 0;

[0008] S4. Obtain the turning point of pressure in real time, and determine whether the oscillation frequency of water accumulation in the pipeline coincides with the frequency of the respiratory signal according to the pressure of the adjacent turning point, and add 1 to the CNT2 count; set the CNT2 count threshold, if the oscillation frequency in the unit inhalation cycle is greater than the CNT2 count threshold, set Flagpress to 1, otherwise, set Flagpress to 0;

[0009] S5. If Flagflow and Flagpress are both set to 0, it is determined that the respiratory support equipment pipeline is in a water accumulation event.

[0010] One of the preferred solutions is that the turning point of the flow is obtained in real time in step S3, specifically:

[0011] Get the flow values ​​f0, f1, f2 corresponding to three consecutive time nodes t0, t1, t2;

[0012] If (f0-f1)*(f1-f2)<0, the flow value f1 corresponding to the time node t1 is taken as the turning point of the flow.

[0013] One of the preferred solutions is that in step S3, judging whether the pipeline water accumulation oscillation frequency coincides with the respiratory signal frequency according to the flow rate of adjacent turning points is specifically as follows:

[0014] Set the flow threshold F and time threshold T;

[0015] The flow rates at adjacent turning points are recorded as F0 and F1, and the corresponding timestamps are T0 and T1;

[0016] If F0-F1>F, and T1-T0<T, it is determined that the pipeline water oscillation frequency does not coincide with the breathing signal frequency, and CNT1 counts up by 1; otherwise, it returns to step S2.

[0017] In one of the preferred solutions, the flow threshold F is 5 L / min.

[0018] In one of the preferred solutions, the time threshold T is 0.1 s.

[0019] One of the preferred solutions is that the step S3 sets the CNT1 counting threshold. If the oscillation frequency in a unit inhalation cycle is greater than the CNT1 counting threshold, Flagflow is set to 1, otherwise, Flagflow is set to 0. Specifically:

[0020] Set a CNT1 count threshold, the CNT1 count threshold is 5;

[0021] Determine whether the oscillation frequency in the unit inhalation cycle is greater than the CNT1 counting threshold; if so, set Flagflow to 1, that is, it is determined that the oscillation caused by water accumulation in the pipeline appears in the flow signal; otherwise, set Flagflow to 0 and return to step S2.

[0022] One of the preferred solutions, in step S4, the turning point of the pressure is obtained in real time, specifically:

[0023] Get the pressure values ​​p0, p1, p2 corresponding to three consecutive time nodes t0, t1, t2;

[0024] If (p0-p1)*(p1-p2)<0, the pressure value p1 corresponding to the time node t1 is taken as the turning point of the pressure.

[0025] In one of the preferred solutions, the step S4 determines whether the pipeline water accumulation oscillation frequency coincides with the respiratory signal frequency according to the pressure of the adjacent turning points, specifically:

[0026] Set the pressure threshold P and time threshold T;

[0027] The pressures at adjacent turning points are recorded as P0 and P1, and the corresponding timestamps are T0 and T1;

[0028] If P0-P1>P, and T1-T0<T, it is determined that the pipeline water oscillation frequency does not coincide with the breathing signal frequency, and CNT2 counts up by 1; otherwise, it returns to step S2.

[0029] In one of the preferred embodiments, the pressure threshold P is 1 cmH2O.

[0030] One of the preferred solutions is that the step S4 sets the CNT2 counting threshold. If the oscillation frequency in the unit inhalation cycle is greater than the CNT2 counting threshold, Flagpress is set to 1, otherwise, Flagpress is set to 0, specifically:

[0031] Set a CNT2 counting threshold, the CNT2 counting threshold is 5;

[0032] Determine whether the oscillation frequency within a unit inhalation cycle is greater than the CNT2 counting threshold; if so, set Flagpress to 1, i.e., determine that oscillation caused by water accumulation in the pipeline appears in the pressure signal; otherwise, set Flagpress to 0 and return to step S2.

[0033] In the above technical solution of the present invention, the dual-level mode pipeline water accumulation detection method of the respiratory support equipment includes the following steps: setting CNT1 and CNT2 counts and initializing them; judging whether the patient enters the inhalation state; obtaining the turning point of the flow in real time, and judging whether the pipeline water accumulation oscillation frequency coincides with the respiratory signal frequency according to the flow of the adjacent turning point, and the CNT1 count is increased by 1; setting the CNT1 counting threshold, if the oscillation frequency in the unit inhalation cycle is greater than the CNT1 counting threshold, Flagflow is set to 1, otherwise, Flagflow is set to 0; obtaining the turning point of the pressure in real time, and judging whether the pipeline water accumulation oscillation frequency coincides with the respiratory signal frequency according to the pressure of the adjacent turning point, and the CNT2 count is increased by 1; setting the CNT2 counting threshold, if the oscillation frequency in the unit inhalation cycle is greater than the CNT2 counting threshold, Flagpress is set to 1, otherwise, Flagpress is set to 0; if Flagflow and Flagpress are both set to 0, it is determined that the pipeline of the respiratory support equipment is in a water accumulation event. In the dual-level mode of the respiratory support equipment, the present invention determines whether there is water accumulation in the pipeline by analyzing the waveform characteristics of different water accumulation amounts in the pipeline in different placement states, combined with the oscillation of the flow waveform and the pressure waveform, thereby solving the technical problem of how to accurately and quickly determine the water accumulation situation in the pipeline of the respiratory support equipment in the dual-level mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0035] Figure 1 A schematic diagram of a method for detecting water accumulation in a dual-level mode pipeline of a respiratory support device according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of flow waveform determination according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of pressure waveform determination according to an embodiment of the present invention;

[0038] Figure 4This is a schematic diagram of flow oscillation according to an embodiment of the present invention;

[0039] Figure 5 Schematic diagram of pressure oscillation according to an embodiment of the present invention.

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0043] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] See also Figure 1-Figure 5 According to one aspect of the present invention, the present invention provides a method for detecting water accumulation in a dual-level mode pipeline of a respiratory support device, wherein the method for detecting water accumulation in a dual-level mode pipeline of a respiratory support device comprises the following steps:

[0045] S1, set CNT1 and CNT2 counts and initialize;

[0046] S2, determining whether the patient has entered the inhalation state, if so, executing step S3;

[0047] S3. Obtain the turning point of the flow in real time, and determine whether the oscillation frequency of the pipeline water accumulation coincides with the respiratory signal frequency based on the flow of the adjacent turning points, and add 1 to the CNT1 count; set the CNT1 count threshold, if the oscillation frequency in the unit inhalation cycle is greater than the CNT1 count threshold, set Flagflow to 1, otherwise, set Flagflow to 0;

[0048] S4. Obtain the turning point of pressure in real time, and determine whether the oscillation frequency of water accumulation in the pipeline coincides with the frequency of the respiratory signal according to the pressure of the adjacent turning point, and add 1 to the CNT2 count; set the CNT2 count threshold, if the oscillation frequency in the unit inhalation cycle is greater than the CNT2 count threshold, set Flagpress to 1, otherwise, set Flagpress to 0;

[0049] S5. If Flagflow and Flagpress are both set to 0, it is determined that the respiratory support equipment pipeline is in a water accumulation event.

[0050] Specifically, in the present embodiment, when a certain amount of water accumulates in the pipeline of the respiratory support device, high-frequency and large-amplitude oscillations will occur near the peak values ​​of the flow waveform and the pressure waveform of the respiratory support device in the dual-level mode. The oscillations are directly related to the amount of water accumulation and the placement angle of the pipeline. If the placement angle of the pipeline is qualitatively divided into three types, such as flat, the first bending angle and the second bending angle, the length of the pipeline of the respiratory support device can reach 1.8m. In actual use, it is generally in the second bending angle state, that is, in a relatively curved state. Through analysis, it can be seen that in a pipeline in a flat state, it is even difficult to produce obvious characteristic fluctuations with a water volume greater than 20mL. In a pipeline in the first bending angle state, 15mL of water is required to produce recognizable oscillations. In a pipeline in the second bending angle state, 5mL or even less water accumulation can produce oscillations of the flow meter pressure waveform, wherein the second bending angle is greater than the first bending angle. Therefore, the present invention determines the event of water accumulation in the pipeline of the respiratory support device based on the second bending angle state.

[0051] Specifically, in this embodiment, see Figure 4-Figure 5 The horizontal axis is time (s), and the vertical axis is flow and pressure. When the respiratory support equipment determines that the patient has entered the inhalation state, the pressure changes from expiratory pressure to inspiratory pressure. When in IPAP, the increase in pressure will cause the accumulated water to be blown into "turbulence", thus forming oscillation.

[0052] Specifically, in this embodiment, the turning point of the flow is obtained in real time in step S3, specifically:

[0053] Get the flow values ​​f0, f1, f2 corresponding to three consecutive time nodes t0, t1, t2;

[0054] If (f0-f1)*(f1-f2)<0, the flow value f1 corresponding to the time node t1 is taken as the turning point of the flow.

[0055] Specifically, in this embodiment, in step S3, judging whether the pipeline water accumulation oscillation frequency coincides with the respiratory signal frequency according to the flow rate of adjacent turning points is as follows:

[0056] Set the flow threshold F and time threshold T;

[0057] The flow rates at adjacent turning points are recorded as F0 and F1, and the corresponding timestamps are T0 and T1;

[0058] If F0-F1>F, and T1-T0<T, it is determined that the pipeline water oscillation frequency does not coincide with the breathing signal frequency, and CNT1 counts up by 1; otherwise, it returns to step S2.

[0059] Specifically, in this embodiment, the flow threshold F is 5 L / min, which is not specifically limited in the present invention and can be proportionally adjusted according to the current flow.

[0060] Specifically, in this embodiment, the time threshold T is 0.1s, which is not specifically limited in the present invention and can be set as needed.

[0061] Specifically, in this embodiment, the step S3 sets the CNT1 counting threshold. If the oscillation frequency in a unit inhalation cycle is greater than the CNT1 counting threshold, Flagflow is set to 1, otherwise, Flagflow is set to 0. Specifically:

[0062] Set a CNT1 count threshold, the CNT1 count threshold is 5;

[0063] Determine whether the oscillation frequency in the unit inhalation cycle is greater than the CNT1 counting threshold; if so, set Flagflow to 1, that is, it is determined that the oscillation caused by water accumulation in the pipeline appears in the flow signal; otherwise, set Flagflow to 0 and return to step S2.

[0064] Specifically, in this embodiment, the turning point of the pressure is obtained in real time in step S4, specifically:

[0065] Get the pressure values ​​p0, p1, p2 corresponding to three consecutive time nodes t0, t1, t2;

[0066] If (p0-p1)*(p1-p2)<0, the pressure value p1 corresponding to the time node t1 is taken as the turning point of the pressure.

[0067] Specifically, in this embodiment, the step S4 determines whether the pipeline water accumulation oscillation frequency coincides with the breathing signal frequency according to the pressure of the adjacent turning points, specifically:

[0068] Set the pressure threshold P and time threshold T;

[0069] The pressures at adjacent turning points are recorded as P0 and P1, and the corresponding timestamps are T0 and T1;

[0070] If P0-P1>P, and T1-T0<T, it is determined that the pipeline water oscillation frequency does not coincide with the breathing signal frequency, and CNT2 counts up by 1; otherwise, it returns to step S2.

[0071] Specifically, in this embodiment, the pressure threshold P is 1 cmH2O, which is not specifically limited in the present invention and can be set according to needs.

[0072] Specifically, in this embodiment, the step S4 sets the CNT2 counting threshold. If the oscillation frequency in the unit inhalation cycle is greater than the CNT2 counting threshold, Flagpress is set to 1, otherwise, Flagpress is set to 0, specifically:

[0073] Set a CNT2 counting threshold, the CNT2 counting threshold is 5;

[0074] Determine whether the oscillation frequency within a unit inhalation cycle is greater than the CNT2 counting threshold; if so, set Flagpress to 1, i.e., determine that oscillation caused by water accumulation in the pipeline appears in the pressure signal; otherwise, set Flagpress to 0 and return to step S2.

[0075] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A method for detecting water accumulation in dual-level mode pipelines of a respiratory support device, characterized in that: The following steps are involved: S1, set CNT1 and CNT2 counts and initialize; S2, determining whether the patient has entered the inhalation state, if so, executing step S3; S3. Obtain the turning point of the flow in real time, and determine whether the oscillation frequency of the pipeline water accumulation coincides with the respiratory signal frequency based on the flow of the adjacent turning points, and add 1 to the CNT1 count; set the CNT1 count threshold, if the oscillation frequency in the unit inhalation cycle is greater than the CNT1 count threshold, set Flagflow to 1, otherwise, set Flagflow to 0; S4. Obtain the turning point of pressure in real time, and determine whether the oscillation frequency of water accumulation in the pipeline coincides with the frequency of the respiratory signal according to the pressure of the adjacent turning point, and add 1 to the CNT2 count; set the CNT2 count threshold, if the oscillation frequency in the unit inhalation cycle is greater than the CNT2 count threshold, set Flagpress to 1, otherwise, set Flagpress to 0; S5. If Flagflow and Flagpress are both set to 0, it is determined that the respiratory support equipment pipeline is in a water accumulation event.

2. A method for detecting water accumulation in a dual-level mode pipeline of a respiratory support device according to claim 1, characterized in that: The turning point of the flow rate is obtained in real time in step S3, specifically: Get the flow values ​​f0, f1, f2 corresponding to three consecutive time nodes t0, t1, t2; If (f0-f1)*(f1-f2)<0, the flow value f1 corresponding to the time node t1 is taken as the turning point of the flow.

3. A method for detecting water accumulation in a dual-level mode pipeline of a respiratory support device according to any one of claims 1 to 2, characterized in that: In step S3, it is determined whether the pipeline water accumulation oscillation frequency coincides with the breathing signal frequency according to the flow rate of adjacent turning points, specifically: Set the flow threshold F and time threshold T; The flow rates at adjacent turning points are recorded as F0 and F1, and the corresponding timestamps are T0 and T1; If F0-F1>F, and T1-T0<T, it is determined that the pipeline water oscillation frequency does not coincide with the breathing signal frequency, and CNT1 counts up by 1; otherwise, it returns to step S2.

4. A method for detecting water accumulation in a dual-level mode pipeline of a respiratory support device according to claim 3, characterized in that: The flow rate threshold F is 5 L / min.

5. A method for detecting water accumulation in dual-level mode pipelines of a respiratory support device according to claim 3, characterized in that: The time threshold T is 0.1s.

6. A method for detecting water accumulation in a dual-level mode pipeline of a respiratory support device according to any one of claims 1 to 2, characterized in that: The step S3 sets the CNT1 counting threshold. If the oscillation frequency in a unit inhalation cycle is greater than the CNT1 counting threshold, Flagflow is set to 1. Otherwise, Flagflow is set to 0. Specifically: Set a CNT1 counting threshold, the CNT1 counting threshold is 5; Determine whether the oscillation frequency in the unit inhalation cycle is greater than the CNT1 counting threshold; if so, set Flagflow to 1, that is, it is determined that the oscillation caused by water accumulation in the pipeline appears in the flow signal; otherwise, set Flagflow to 0 and return to step S2.

7. A method for detecting water accumulation in a dual-level mode pipeline of a respiratory support device according to any one of claims 1 to 2, characterized in that: The turning point of the pressure is obtained in real time in step S4, specifically: Get the pressure values ​​p0, p1, p2 corresponding to three consecutive time nodes t0, t1, t2; If (p0-p1)*(p1-p2)<0, the pressure value p1 corresponding to the time node t1 is taken as the turning point of the pressure.

8. A method for detecting water accumulation in a dual-level mode pipeline of a respiratory support device according to any one of claims 1 to 2, characterized in that: The step S4 determines whether the pipeline water accumulation oscillation frequency coincides with the breathing signal frequency according to the pressure of the adjacent turning points, specifically: Set the pressure threshold P and time threshold T; The pressures at adjacent turning points are recorded as P0 and P1, and the corresponding timestamps are T0 and T1; If P0-P1>P, and T1-T0<T, it is determined that the pipeline water oscillation frequency does not coincide with the breathing signal frequency, and CNT2 counts up by 1; otherwise, it returns to step S2.

9. A method for detecting water accumulation in the dual-level mode pipeline of a respiratory support device according to claim 8, characterized in that: The pressure threshold P is 1 cmH2O.

10. A method for detecting water accumulation in a dual-level mode pipeline of a respiratory support device according to any one of claims 1 to 2, characterized in that: The step S4 sets the CNT2 counting threshold. If the oscillation frequency in a unit inhalation cycle is greater than the CNT2 counting threshold, Flagpress is set to 1. Otherwise, Flagpress is set to 0. Specifically: Set a CNT2 counting threshold, the CNT2 counting threshold is 5; Determine whether the oscillation frequency within a unit inhalation cycle is greater than the CNT2 counting threshold; if so, set Flagpress to 1, i.e., determine that oscillation caused by water accumulation in the pipeline appears in the pressure signal; otherwise, set Flagpress to 0 and return to step S2.

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