A ventilator phase switching method and device based on respiratory effort recognition, a ventilation device and a storage medium

Abstract

The present application belongs to the technical field of medical general equipment, and relates to a ventilator phase switching method and device based on respiratory effort recognition, a ventilation equipment and a storage medium. The method comprises the following steps: monitoring a patient's proximal ventilation flow and airway pressure; according to a set logical enabling condition, avoiding an undesirable recognition period; the undesirable recognition period is an initial unstable stage after the ventilator inflation or breathing starts; outside the undesirable recognition period, based on the waveform trajectory change characteristics of the ventilation flow and the airway pressure, the time when the patient's inspiratory effort ends, the expiratory effort starts or the inspiratory effort starts is recognized; and according to the recognition result, the ventilator is controlled to switch between the inflation phase and the exhalation phase. The present application can improve the sensitivity and accuracy of respiratory effort recognition, improve the time synchronization of ventilation triggering and switching, reduce the phenomenon of man-machine asynchronization, and improve the comfort and effectiveness of mechanical ventilation support.

Description

Technical Field

[0001] This invention belongs to the field of general medical equipment technology, and particularly relates to a ventilator phase switching method, device, ventilation equipment and storage medium based on respiratory effort recognition. Background Technology

[0002] Mechanical ventilation is a crucial means of maintaining respiratory function in critical care medicine and anesthesiology. Its core objective is to ensure oxygenation and ventilation through mechanical ventilation, while simultaneously reducing the patient's respiratory burden. During mechanical ventilation, the coordination between the patient's spontaneous breathing effort and the ventilator's delivery directly affects the treatment outcome. Ideally, the ventilator's delivery and the patient's breathing effort are highly matched in the onset, maintenance, and termination phases, with appropriate intensity; this state is called patient-ventilator synchronization. The timing consistency between ventilator delivery and the patient's chest and lung expansion is called timing synchronization, a key indicator for measuring patient-ventilator synchronization.

[0003] However, in clinical practice, due to differences in patient respiratory mechanics and the inherent response characteristics of ventilators, patient-ventilator asynchrony is quite common. Based on its mechanism, typical forms include: 1. Ineffective Effort: The patient's spontaneous inspiration did not trigger mechanical ventilation; 2. Auto-triggering: The ventilator accidentally delivers gas without the patient's voluntary effort. 3. Double Triggering: A patient's inspiratory effort triggers two consecutive ventilations from the ventilator; 4. Premature Cycling or Delayed Cycling: The timing of the expiratory cyclling deviates from the patient's actual breathing.

[0004] These asynchrony phenomena can lead to ventilation discomfort, increased breathing work, increased risk of lung injury, and even reduce the overall effectiveness of mechanical ventilation.

[0005] Currently, commonly used inspiratory triggering methods for ventilators include flow triggering and pressure triggering. Expiratory switching is typically based on automatically switching to the expiratory phase when the inspiratory flow rate drops to a certain percentage (e.g., 25%) of the peak flow rate. However, existing technologies still have significant limitations in clinical application: 1. Trigger delay and invalid trigger: When the patient's spontaneous inspiratory ability is weak, the respiratory effort is insufficient, or there is intrinsic positive end-expiratory pressure (PEEP, PEEPi), the ventilator has difficulty in timely sensing the patient's inspiratory signal, resulting in trigger delay or invalid trigger.

[0006] 2. Misalignment in switching timing: Different patients have different respiratory mechanics (such as lung compliance and airway resistance), resulting in different inspiratory flow rate characteristics. Existing flow- or pressure-triggered switching algorithms are fixed and rely on flow or pressure thresholds, making it difficult to adapt to individual differences. This may lead to premature or delayed switching, reducing synchronicity.

[0007] 3. Difficulty in adapting to dynamic changes in patient breathing patterns: Clinically, patients' breathing patterns may change with their condition or treatment interventions, such as fluctuations in muscle strength, changes in respiratory rate, or the use of analgesics and sedatives. Existing triggering and switching strategies are mostly based on fixed thresholds, lacking real-time adaptive capabilities and making it difficult to maintain a high level of synchronization over a long period.

[0008] Therefore, although existing ventilator technology can meet basic ventilation needs in routine applications, it still has significant shortcomings in improving patient-ventilator synchrony, optimizing patient comfort, and reducing respiratory burden. This provides a technological foundation and an urgent need for the development of novel triggering and switching algorithms. Summary of the Invention

[0009] The purpose of this invention is to overcome the defects of the prior art and to propose a ventilator phase switching method, device, ventilation equipment and storage medium based on respiratory effort recognition.

[0010] In view of this, the present invention proposes a ventilator phase switching method based on respiratory effort recognition, comprising: Monitor the patient's proximal ventilation flow and airway pressure; Based on the set logical activation conditions, unwanted identification periods are avoided; the unwanted identification period is the initial unstable phase after ventilator inflation or breathing begins. Outside of the desired identification period, based on the waveform trajectory change characteristics of proximal ventilation flow and airway pressure, the moment when the patient's inspiratory effort ends, expiratory effort begins, or inspiratory effort begins can be identified. Based on the identification results, the ventilator is controlled to switch between the inflation and expiration phases.

[0011] As an improvement to the above method, the logical enabling conditions include: During the inflation phase, if the duration of the inflation phase exceeds the pressure rise time setting value of the corresponding mode, and the duration of continuous decrease in inspiratory flow exceeds the first threshold, then the recognition of the patient's end of inspiratory effort and the start of expiratory effort is enabled; the pressure rise time setting value is set according to the delivery characteristics of the ventilator and ranges from tens of milliseconds to hundreds of milliseconds. During the expiratory phase, if the absolute value of the expiratory flow rate continues to decrease for a period of time exceeding a second threshold, the recognition of the patient's inspiratory effort initiation is activated.

[0012] As an improvement to the above method, the unwanted recognition periods include the beginning of the inflation phase and the beginning of the expiration phase, and the recognition function is disabled by default.

[0013] As an improvement to the above method, based on the waveform trajectory changes of ventilation flow and airway pressure, the system identifies the end of the patient's inspiratory effort and the beginning of expiratory effort, specifically including: During the inflation phase, when the absolute value of the proximal ventilation flow rate changes from an accelerating to a decelerating state, and the acceleration of the change meets a first acceleration threshold condition, the inspiratory effort is considered to have ended. The first acceleration threshold condition is: the acceleration of the current flow rate change is greater than or equal to... The unit is ,in, For real-time proximal ventilation flow, This represents the closest extreme value of the inhalation velocity. k For the generalization factor; and When airway pressure accelerates and the rate of increase continues to exceed the first speed threshold for a preset duration, expiratory effort is determined to have begun.

[0014] As an improvement to the above method, the onset of a patient's inspiratory effort is identified based on the waveform trajectory changes of ventilation flow and airway pressure, specifically including: During the expiratory phase, when the absolute value of the tidal flow rate changes from a decelerating decrease to an accelerating decrease, and the acceleration of this change satisfies a second acceleration threshold condition, the second acceleration threshold condition being: the acceleration of the change in the absolute value of the current tidal flow rate exceeds... ;or The airway pressure continued to decrease at an accelerating rate, exceeding 1 cmH2O / s, while the acceleration was less than - If the inhalation effort continues for more than the preset duration, it is determined that the inhalation effort has begun.

[0015] In a second aspect, the present invention provides a ventilator phase switching control device based on respiratory effort recognition, comprising: Flow measurement equipment is used to monitor the proximal ventilation flow rate of patients; Pressure measurement equipment used to monitor airway pressure in patients; Processor, configured to execute the ventilator phase switching method based on respiratory effort recognition as described in any one of claims 2-5; and Memory, connected to the processor, is used to store program instructions and data.

[0016] Thirdly, the present invention provides a medical ventilation device, comprising: Gas source, used to provide gas under the control of the processor; Breathing tubing, connected to the air source; The ventilation phase switching control device includes a flow measurement device and a pressure measurement device connected to the breathing tubing. The processor controls the working state of the gas source based on the identification results, switching between the inflation phase and the expiration phase.

[0017] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the above-described ventilator phase switching method based on respiratory effort recognition is implemented.

[0018] Compared with the prior art, the advantages of the present invention are: it solves the problem of human-ventilator asynchrony during the triggering and switching process of existing ventilators, and improves the synchronicity, comfort and effectiveness of mechanical ventilation; 1. Improve the sensitivity and accuracy of respiratory effort recognition; 2. Reduce invalid triggers and premature switching; 3. Adapt to the dynamic changes in the patient's breathing pattern to improve the comfort and effectiveness of mechanical ventilation support. Attached Figure Description

[0019] Figure 1 This is a typical characteristic of asynchronous human-machine interaction in the traffic waveform (green indicates delayed triggering, and red indicates delayed switching). Figure 2 This is a typical characteristic of human-machine asynchronous operation in a pressure waveform (green indicates delayed triggering, and red indicates delayed switching). Figure 3 This is a flowchart of the ventilator phase switching method based on respiratory effort recognition according to the present invention; Figure 4 This is a comparison of the triggering delay of the present invention with that of existing technologies. R rs =5cmH2O / (L / s), C rs =20mL / cmH2O); Figure 5 This is a comparison of the triggering delay of the present invention with that of existing technologies. R rs =5cmH2O / (L / s), C rs=50mL / cmH2O); Figure 6 This is a comparison of the triggering delay of the present invention with that of existing technologies. R rs =10 cmH2O / (L / s), C rs =30mL / cmH2O); Figure 7 This is a comparison of the triggering delay of the present invention with that of existing technologies. R rs =50cmH2O / (L / s), C rs =20mL / cmH2O); Figure 8 This is a comparison of the switching delay between the present invention and existing technologies. R rs =50cmH2O / (L / s), C rs =20mL / cmH2O). Detailed Implementation

[0020] The method of this invention identifies the actual moments of the end of inspiratory effort, the beginning of expiratory effort, and the start of inspiratory effort by monitoring the patient's proximal ventilation flow and airway pressure, based on the trajectory changes of their waveforms. A logic activation condition is set before identification to avoid unstable and undesirable identification periods such as the initial stages of inflation and expiration. The judgment strategy is only activated after the flow or pressure shows a sustained stable trend. During the inflation phase, the end of inspiratory effort or the beginning of voluntary expiration is identified by the characteristic of the inspiratory flow rate changing from an accelerated decrease to a decelerated decrease, and the characteristic of the airway pressure rising rapidly. During the expiratory phase, the beginning of inspiratory effort is identified by a sudden increase in the rate at which the absolute value of the expiratory flow rate returns to zero, or by the rapid decrease in airway pressure.

[0021] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0022] Example 1 like Figure 3 As shown, this embodiment of the invention provides a ventilator phase switching method based on respiratory effort recognition, applied to medical ventilation equipment. The method includes: Step 1: Monitor the patient's proximal ventilation flow and airway pressure using flow and pressure measurement equipment; Step 2: When the patient is in the inflation phase, determine whether the patient has ended their inspiratory effort or started an expiratory effort based on the trajectory change characteristics of the inspiratory flow waveform and the airway pressure waveform. The steps include: when the trajectory change characteristics of the inspiratory flow waveform during the inflation phase are identified, it is determined that the patient's inspiratory effort has ended; when the trajectory change characteristics of the airway pressure waveform during the inflation phase are identified, it is determined that the patient has started an expiratory effort.

[0023] Step 3: When the patient is in the expiratory phase, determine whether the patient has started an inspiratory effort based on the trajectory change characteristics of the expiratory flow waveform or the airway pressure waveform; including: when the trajectory change characteristics of the expiratory flow waveform or the airway pressure waveform in the expiratory phase are identified, determine that the patient has generated an inspiratory effort.

[0024] In the above method, before identifying the patient's respiratory effort based on the changes in the flow waveform and airway pressure waveform trajectory, the method further includes: Avoid unwanted identification periods and activate the corresponding judgment when the logic activation preset conditions are met during the inflation or expiration phase; the logic activation preset conditions include: (1) Disabled by default at the start of the inflation and expiration phases; (2) During the inflation phase, if the duration of the inflation phase exceeds the pressure rise time setting value of the corresponding mode and the continuous decrease time of the inspiratory flow exceeds a certain threshold, the judgment strategy of the patient's respiratory effort ending and active exhalation beginning is activated; the pressure rise time setting value of the corresponding mode is a time threshold used to ensure that the inflation airflow enters a stable state. It is a setting parameter in pressure control mode or pressure support mode, and is usually set according to the desired gas delivery characteristics of the ventilator, ranging from tens of milliseconds to hundreds of milliseconds.

[0025] (3) During the expiratory phase, if the absolute value of the expiratory flow rate continues to decrease for a period of time exceeding a certain threshold, the patient's respiratory effort initiation judgment strategy shall be activated. For step 2, the inflation stage: The trajectory change characteristics of the inspiratory flow rate waveform are as follows: the velocity at which the inspiratory flow rate reaches zero suddenly decreases, that is, the inspiratory flow rate changes from an accelerating decreasing state to a decelerating decreasing state, and the acceleration meets the threshold condition; (e.g.) Figure 1 (The red segment at the beginning of the flow waveform). In a specific embodiment, the acceleration threshold is selected as... ,in For real-time near-end traffic, The most recent extreme value of the intake airflow rate is given by , and k is the generalization factor, which depends on the signal quality and is used to balance recognition stability and sensitivity.

[0026] The trajectory of the airway pressure waveform is characterized by a continuous increase in airway pressure; (e.g.) Figure 2 (The red segment at the beginning of the pressure waveform). In a specific embodiment, a sustained increase in airway pressure means that the pressure rise rate exceeds a certain threshold for a continuous 6ms. This threshold can be selected based on the current ventilation pressure setting and the dynamic performance of the expiratory valve.

[0027] For step 3, the expiratory phase: The trajectory change characteristics of the expiratory flow waveform are as follows: the rate at which the absolute value of the expiratory flow returns to zero suddenly increases, that is, the absolute value of the expiratory flow changes from a decelerating state to an accelerating state, and the acceleration meets the threshold condition; (e.g.) Figure 1 (The green segment at the beginning of the flow waveform), in a specific embodiment, the flow acceleration threshold is... An acceleration of the absolute value of expiratory flow exceeding this value is considered a sudden increase in the absolute value of expiratory flow.

[0028] The trajectory change characteristics of the airway pressure waveform during the expiratory phase are: an accelerated decrease in airway pressure over a certain time threshold, i.e., a continuous decrease in pressure, and the acceleration meets the threshold condition; (e.g.) Figure 2 (The green segment at the beginning of the pressure waveform). In a specific embodiment, the criterion for accelerated descent is that the rate of decrease in expiratory pressure exceeds 1 cmH2O / s and the pressure acceleration is less than - Furthermore, the above conditions must be maintained for more than 6ms. This pressure-velocity and acceleration threshold can be selected based on the current positive end-expiratory pressure (PEEP) setting and the performance of the PEEP control algorithm for the applicable device model.

[0029] Example 2 This invention provides a ventilator phase switching control device based on respiratory effort recognition, applied to medical ventilation equipment. The device includes: A flow measurement device for monitoring the patient's proximal ventilation flow; connected to the processor; A pressure measurement device for monitoring patient airway pressure; connected to the processor; Memory, connected to the processor, is used to store program instructions and data; A processor is configured to execute a control program stored in the memory to perform the following steps: 1. Monitor proximal ventilation flow and airway pressure in patients using flow and pressure measurement devices; 2. When the patient is in the inflation phase, determine whether the patient has ended the inspiratory effort or started the expiratory effort based on the trajectory change characteristics of the inspiratory flow waveform and airway pressure waveform. 3. When the patient is in the expiratory phase, determine whether the patient has begun to make an inspiratory effort based on the trajectory change characteristics of the expiratory flow waveform and airway pressure waveform; control the medical ventilation device to switch the ventilation phase according to the identified respiratory state.

[0030] In the above-described device, before the processor performs patient respiratory effort identification based on the flow waveform and airway pressure waveform trajectory change characteristics, it further includes: Avoid unwanted recognition periods and activate the corresponding judgment when the logic activation preset conditions are met during the inflation or exhalation phase; In the above-mentioned device, the logic activation preset conditions include: 1. Disabled by default at the start of the inflation or expiration phase; 2. During the inflation phase, if the inflation phase lasts longer than the set Tslope and the inspiratory flow rate continues to decrease for a period of time, the judgment strategy for the patient's end of respiratory effort and the start of voluntary exhalation shall be activated. 3. During the expiratory phase, if the absolute value of the expiratory flow rate continues to decrease for a period of time, the patient's respiratory effort initiation judgment strategy shall be activated. In the above device, the trajectory change characteristics of the inhalation flow waveform based on the processor are as follows: the zeroing speed of the inhalation flow suddenly decreases, that is, the inhalation flow changes from an accelerating downward state to a decelerating downward state, and the acceleration meets the threshold condition. In the above device, during the inflation phase, the trajectory change characteristics of the airway pressure waveform based on the processor are: the airway pressure continuously increases; In the above device, the trajectory change characteristics of the expiratory flow waveform based on the processor during the inflation phase are as follows: the zeroing speed of the absolute value of expiratory flow suddenly increases, that is, the absolute value of expiratory flow changes from a decelerating downward state to an accelerating downward state, and the acceleration meets the threshold condition. In the above device, the trajectory change characteristics of the airway pressure waveform based on the processor during the expiratory phase are: the airway pressure continuously decreases at a certain time threshold, that is, the pressure continues to decrease and the acceleration meets the threshold condition. In the aforementioned device, the step of the processor determining whether a patient has ended their inspiratory effort or begun an expiratory effort based on the trajectory change characteristics of the inspiratory flow waveform and airway pressure waveform during the expiratory phase includes: 1. When the trajectory change characteristics of the inspiratory flow waveform during the inflation phase are detected, it is determined that the patient's inspiratory effort has ended; 2. When the trajectory change characteristics of the airway pressure waveform during the inflation phase are identified, it is determined that the patient is making an expiratory effort.

[0031] In the above-described device, the step of the processor determining whether the patient is making an inspiratory effort based on the trajectory change characteristics of the expiratory flow waveform and the airway pressure waveform includes: 1. When the trajectory change characteristics of the expiratory flow waveform or the airway pressure waveform during the expiratory phase are identified, it is determined that the patient is making an inspiratory effort.

[0032] In the above-mentioned device, controlling the medical ventilation equipment to switch ventilation phases based on the identified respiratory effort state includes: 1. If the processor detects that the respiratory effort state is the end of inspiratory effort or the beginning of expiratory effort, it triggers the medical ventilation device to enter the expiratory phase; 2. If the processor recognizes that the breathing effort state is the start of inspiratory effort, it triggers the medical ventilation device to enter the inflation phase.

[0033] Example 3 This invention provides a medical ventilation device that includes the ventilation phase switching control device described above. The medical ventilation device includes the ventilator phase switching control device based on respiratory effort recognition of Embodiment 2, and also includes a gas source and a breathing tubing. The ventilation phase switching control device includes a flow measurement device, a pressure measurement device, a processor, and a memory, wherein the processor, the flow measurement device, the pressure measurement device, and the memory are connected. The gas source is connected to the processor and provides ventilation support to the patient under the control of the processor; The breathing tubing is connected to the air source and provides a breathing path during ventilation; The flow measurement device is connected to the breathing tubing to monitor the patient's ventilation flow during ventilation. The pressure measuring device is connected to the breathing tubing to monitor the patient's airway pressure during ventilation.

[0034] Example 4 This invention provides a computer-readable storage medium storing a breathing effort identification program and a ventilation phase switching control program. The breathing effort identification program and the ventilation phase switching control program can be executed by a processor to implement the above-described ventilation phase switching control method.

[0035] Experimental data: The prior art described below mainly refers to the ventilator phase control method based on respiratory effort recognition, which is used in mainstream ventilators.

[0036] like Figure 4 As shown, for R rs =5cmH2O, C rs In a respiratory mechanics model with a concentration of 20 mL / cmH2O, both existing technologies and the trigger enhancement function of this invention can recognize spontaneous breathing efforts and initiate ventilator inflation in all use cases. The average trigger delay of this invention is 112.3 ms, which is less than the average trigger delay of 218.4 ms in the prior art.

[0037] like Figure 5 As shown, for R rs =5cmH2O, C rsIn a respiratory mechanics model with a concentration of 50 mL / cmH2O, both existing technologies and the trigger enhancement function of this invention can recognize spontaneous breathing efforts and initiate ventilator inflation in all use cases. The average trigger delay of this invention is 108.9 ms, which is less than the average trigger delay of 187.9 ms in the prior art.

[0038] like Figure 6 As shown, for R rs =10cmH2O, C rs In a respiratory mechanics model with a concentration of 30 mL / cmH2O, both existing technologies and the trigger enhancement function of this invention can recognize spontaneous breathing efforts and initiate ventilator inflation in all use cases. The average trigger delay of this invention is 123.6 ms, which is less than the average trigger delay of 221.6 ms in the prior art.

[0039] like Figure 7 As shown, for R rs =50cmH2O, C rs A respiratory mechanics model with a concentration of 20 mL / cmH2O, except for BR = 6 bpm, P mus In use cases other than 5 cmH2O, both existing technologies and the trigger enhancement function of this invention can recognize spontaneous breathing efforts and initiate ventilator inflation. The average trigger delay of this invention is 125.6 ms, which is less than the average trigger delay of 362.3 ms in existing technologies.

[0040] like Figure 8 As shown, for R rs =50cmH2O, C rs In the respiratory mechanics model with a BR of 20 mL / cmH2O, the prior art exhibited severe premature switching in the test case of BR = 6 bpm (test cases 1 and 2 in the figure), while the present invention performed better. In the test cases of BR = 15 bpm and 30 bpm (test cases 3 to 8 in the figure), the switching of the prior art and the present invention was more synchronized.

[0041] In terms of specific triggering performance indicators, in most tests except for a few special cases, the triggering delay of the device of the present invention is shorter than that of the prior art, showing a faster response capability.

[0042] Regarding the ability to switch between respiratory phases, both devices exhibited varying degrees of premature switching in samples under low air resistance conditions. However, it is noteworthy that in typical clinical use cases where inspiratory effort duration is long, the existing technology exhibits a significant premature switching problem, resulting in insufficient inspiratory support time and incomplete fulfillment of the patient's inspiratory intent. In contrast, the device of this invention did not show significant premature switching in such situations, indicating that its identification of the end point of the inflation phase is more accurate.

[0043] In summary, the synchronization enhancement method presented here outperforms existing technologies in terms of handling weak effort, reducing trigger delay, and preventing premature switching due to non-physiological reasons, compared to their homogeneous functionality.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A ventilator phase switching method based on respiratory effort recognition, comprising: Monitor the patient's proximal ventilation flow and airway pressure; Based on the set logical activation conditions, avoid unwanted identification periods; The unwanted identification period is the initial unstable phase after the ventilator is inflated or breathing begins; Outside of the desired identification period, based on the waveform trajectory change characteristics of proximal ventilation flow and airway pressure, the moment when the patient's inspiratory effort ends, expiratory effort begins, or inspiratory effort begins can be identified. Based on the identification results, the ventilator is controlled to switch between the inflation and expiration phases.

2. The ventilator phase switching method based on respiratory effort recognition according to claim 1, characterized in that, The logic activation conditions include: During the inflation phase, if the duration of the inflation phase exceeds the pressure rise time setting value for the corresponding mode, and the duration of continuous decrease in inspiratory flow exceeds the first threshold, then the recognition of the patient's inspiratory effort ending and expiratory effort beginning is enabled; the pressure rise time setting value is set according to the desired ventilator delivery characteristics, and ranges from tens of milliseconds to hundreds of milliseconds. During the expiratory phase, if the absolute value of the expiratory flow rate continues to decrease for a period of time exceeding a second threshold, the recognition of the patient's inspiratory effort initiation is activated.

3. The ventilator phase switching method based on respiratory effort recognition according to claim 2, characterized in that, The undesirable recognition periods include the beginning of the inflation phase and the beginning of the expiration phase; the recognition function is disabled by default.

4. The ventilator phase switching method based on respiratory effort recognition according to claim 2, characterized in that, Based on the waveform trajectory changes of proximal ventilation flow and airway pressure, the system identifies the end of inspiratory effort and the beginning of expiratory effort, specifically including: During the inflation phase, when the absolute value of the proximal ventilation flow rate changes from an accelerating to a decelerating state, and the acceleration of the change meets a first acceleration threshold condition, the inspiratory effort is considered to have ended. The first acceleration threshold condition is: the acceleration of the current flow rate change is greater than or equal to... The unit is ,in, For real-time proximal ventilation flow, This represents the closest extreme value of the inhalation velocity. k For the generalization factor; and When airway pressure accelerates and the rate of increase continues to exceed the first speed threshold for a preset duration, expiratory effort is determined to have begun.

5. The ventilator phase switching method based on respiratory effort recognition according to claim 2, characterized in that, Based on the waveform trajectory changes of proximal ventilation flow and airway pressure, the onset of inspiratory effort in patients is identified, specifically including: During the expiratory phase, when the absolute value of proximal ventilation changes from a decelerating decrease to an accelerating decrease, and the acceleration of this change satisfies a second acceleration threshold condition, the second acceleration threshold condition being: the acceleration of the change in the absolute value of the current ventilation exceeds... ;or The airway pressure continued to decrease at an accelerating rate, exceeding 1 cmH2O / s, while the acceleration was less than - If the inhalation effort continues for more than the preset duration, it is determined that the inhalation effort has begun.

6. A ventilator phase switching control device based on respiratory effort recognition, characterized in that, include: Flow measurement equipment is used to monitor the proximal ventilation flow rate of patients; Pressure measurement equipment used to monitor airway pressure in patients; Processor, configured to execute the ventilator phase switching method based on respiratory effort recognition as described in any one of claims 2-5; and Memory, connected to the processor, is used to store program instructions and data.

7. A medical ventilation device, characterized in that, include: Gas source, used to provide gas under the control of the processor; Breathing tubing, connected to the air source; The ventilation phase switching control device as described in claim 6, wherein the flow measurement device and the pressure measurement device are connected to the breathing tubing, and the processor controls the working state of the gas source according to the identification result, switching between the inflation phase and the exhalation phase.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the ventilator phase switching method based on respiratory effort recognition as described in any one of claims 2 to 5.

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