A cardiopulmonary resuscitation airway flow automatic feedback ventilation method and ventilator

Abstract

The present invention relates to the technical field of ventilators, and specifically discloses a cardiopulmonary resuscitation airway flow automatic feedback ventilation method and a ventilator, including: a ventilation pipeline connected to a ventilator body; a flow sensor arranged on the ventilation pipeline, which is in communication connection with the ventilator body; when performing cardiopulmonary resuscitation, the ventilator body performs ventilation operation according to the airway flow signal fed back by the flow sensor and the set compression and ventilation coordination mode. When a cardiopulmonary resuscitation machine is used in conjunction with a ventilator, cardiopulmonary resuscitation information can be obtained by detecting the airway flow during the cardiopulmonary resuscitation process. The ventilator is not restricted by the communication protocol, and can effectively and quickly ventilate all the compressions of the cardiopulmonary resuscitation machine as required, thereby improving the quality and treatment rate of cardiopulmonary resuscitation first aid; when manual compression cardiopulmonary resuscitation is used, the compression information can be accurately obtained through feedback analysis of the airway flow, and ventilation can be automatically performed in conjunction with manual compression, thereby improving the accuracy and efficiency of ventilator ventilation.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilators, and more specifically, to a cardiopulmonary resuscitation airway flow automatic feedback ventilation method and a ventilator. Background Art

[0002] Cardiopulmonary resuscitation (CPR) is the most basic and important medical method to save the life of patients with cardiac arrest. Chest compression combined with forced ventilation is usually the rescue method that such patients need to obtain as soon as possible to maintain basic blood circulation, heartbeat and breathing recovery;

[0003] Existing cardiopulmonary resuscitation usually includes two important components: heart compression and ventilation (breathing);

[0004] Cardiac compression usually has two forms: manual compression and mechanical (equipment) compression. Manual compression is used when conditions are unavailable; mechanical (equipment) compression is used when conditions are available in the hospital. The clinical requirements for compression usually follow: the frequency of effective chest compression is 100 to 120 times / minute, and the depth is 5 to 6 cm;

[0005] Ventilation (breathing) is usually performed during cardiopulmonary resuscitation: artificial breathing, balloon ventilation and ventilator ventilation; ventilation requirements are based on clinical requirements, with 2 ventilations between 30 compressions, 2 ventilations after 15 compressions and continuous uninterrupted ventilation once every 10 compressions.

[0006] In the prior art, chest compressions are combined with positive pressure ventilation, with a compression frequency of 100 to 120 times per minute, a depth of 5 to 6 cm, and 2 ventilations between 30 compressions (the parameters here refer to adult patients of average size); the coordination of CPR compressions and ventilations is usually coordinated by medical staff, or the CPR compression equipment and the ventilator are coordinated through a communication protocol, and cannot be coordinated automatically;

[0007] In addition, the coordination of CPR compression and ventilation is difficult to be accurately and stably controlled for a long time by manual coordination methods; and the coordination method between CPR compression equipment and ventilator is limited by whether the equipment has coordination function and the stability of signal connection between the equipment;

[0008] Furthermore, current ventilators do not have automatic ventilation recognition functions and are unable to initiate ventilation coordination actions based on airway flow signals;

[0009] The above problems limit the ventilation function of the ventilator when treating patients.

[0010] Therefore, it is necessary to propose a cardiopulmonary resuscitation airway flow automatic feedback ventilation method and a ventilator to at least partially solve the problems existing in the prior art. Summary of the invention

[0011] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0012] In order to at least partially solve the above-mentioned problems, the present invention provides a ventilator with automatic feedback ventilation of airway flow during cardiopulmonary resuscitation, comprising: a ventilation circuit connected to the ventilator body; a flow sensor arranged on the ventilation circuit, which is communicatively connected to the ventilator body; when performing cardiopulmonary resuscitation, the ventilator body performs ventilation operations based on the airway flow signal fed back by the flow sensor and the set collaborative mode of compression and ventilation.

[0013] Preferably, it further comprises: an acquisition module, a preprocessing module, an analysis module and a ventilation control module arranged in the main body of the ventilator;

[0014] An acquisition module, used for acquiring an airway flow signal fed back by a flow sensor;

[0015] A preprocessing module, used for processing the acquired airway flow signal to obtain a processed airway flow signal;

[0016] An analysis module is used to analyze the processed airway flow signal to obtain compression information of cardiopulmonary resuscitation, and obtain a ventilation time window based on the compression information and a set compression and ventilation coordination mode;

[0017] The ventilation control module is used to perform ventilation operations according to the obtained ventilation time window.

[0018] Preferably, the preprocessing module processes the airway flow signal using bandpass filtering, including:

[0019] A preset unit, for presetting the center frequency of the bandpass filter according to the set compression frequency of cardiopulmonary resuscitation;

[0020] The processing unit is used to process the airway flow signal according to a preset bandpass filter to obtain a processed airway flow signal.

[0021] Preferably, the analysis module comprises:

[0022] An identification and judgment unit identifies and judges the processed airway flow signal to obtain compression information of cardiopulmonary resuscitation; wherein the compression information includes: the number of presses and releases;

[0023] The coordinated ventilation judgment unit obtains the ventilation time window according to the compression information and the set compression and ventilation coordination mode.

[0024] Preferably, the identification and judgment unit includes:

[0025] A threshold setting subunit, used to set a flow threshold;

[0026] The judgment subunit is used to judge the processed airway flow signal according to the flow threshold. If the airway flow is less than the negative flow threshold, the current state is the press state. If the airway flow is greater than the positive flow threshold, the current state is the release state. The press and release are counted to obtain the compression information of cardiopulmonary resuscitation.

[0027] Preferably, the flow threshold includes: an initial threshold and a set threshold; at the beginning of cardiopulmonary resuscitation, the initial threshold is used to judge the processed airway flow signal; after the beginning of cardiopulmonary resuscitation, the set threshold is used to judge the processed airway flow signal;

[0028] The setting of the initial threshold includes: setting according to the user's gender, height and weight;

[0029] The setting of the set threshold includes: obtaining airway flow data within a first set time before the current moment, and weighting the airway flow data, selecting the maximum airway flow from the weighted airway flow data, and using the set percentage of the maximum airway flow as the set threshold.

[0030] Preferably, the coordinated ventilation determination unit comprises:

[0031] The first judgment rule is that after the number of cardiopulmonary resuscitation presses reaches the set number of presses, the ventilation time window is determined;

[0032] The second judgment rule is that after the number of cardiopulmonary resuscitation releases obtained reaches the set number of releases, it is judged as the ventilation time window;

[0033] A third judgment rule, if no pressing is detected within a third set time, it is judged as a ventilation time window;

[0034] The calculation formula for the third setting time is:

[0035]

[0036] Wherein, T is the third set time, f and N0 are respectively the set compression frequency and the set number of presses in the set compression and ventilation coordination mode, and N1 is the number of presses obtained for cardiopulmonary resuscitation;

[0037] Among them, the number of compressions and releases of cardiopulmonary resuscitation is obtained based on the compression information, and the set number of compressions, the set number of releases, the set ratio of compressions and ventilations, the set number of ventilations and the set compression frequency are obtained based on the set compression and ventilation coordination mode.

[0038] Preferably, the coordinated ventilation determination unit further includes:

[0039] The fourth judgment rule is that when ventilation is performed, the counting of pressing and releasing is stopped; and after ventilation, the number of pressing and releasing is reset to zero, and the number of pressing and releasing is counted again;

[0040] The fifth judgment rule is to obtain the minute ventilation volume of multiple ventilations, and when the minute ventilation volume of multiple ventilations reaches the set minute ventilation volume, the ventilation operation is not triggered.

[0041] Preferably, it also includes: a guiding compression module for setting the compression mode and compression frequency corresponding to cardiopulmonary resuscitation, and for displaying the current number of cardiopulmonary resuscitation presses, and issuing a prompt when the number of cardiopulmonary resuscitation presses is close to the set number of presses.

[0042] When the compression mode of cardiopulmonary resuscitation is manual compression, it is used to guide the operator to perform compressions according to the set compression frequency.

[0043] A cardiopulmonary resuscitation airway flow automatic feedback ventilation method, applied to the cardiopulmonary resuscitation airway flow automatic feedback ventilation ventilator of the present invention, comprising:

[0044] Obtain the airway flow signal during the user's cardiopulmonary resuscitation;

[0045] The airway flow signal is processed by using a preset bandpass filter to obtain a processed airway flow signal;

[0046] The processed airway flow signal is judged according to the flow threshold. If the airway flow is less than the negative flow threshold, the current state is a press state. If the airway flow is greater than the positive flow threshold, the current state is a release state. The press and release are counted to obtain the number of presses and releases.

[0047] The flow threshold includes: an initial threshold and a set threshold; at the beginning of cardiopulmonary resuscitation, the initial threshold is used to judge the processed airway flow signal; after the beginning of cardiopulmonary resuscitation, the set threshold is used to judge the processed airway flow signal;

[0048] The ventilation operation is performed according to the number of presses and releases, as well as the set compression and ventilation coordination mode.

[0049] Compared with the prior art, the present invention has at least the following beneficial effects:

[0050] The cardiopulmonary resuscitation airway flow automatic feedback ventilation method and ventilator described in the present invention, when a cardiopulmonary resuscitation machine is used to work in conjunction with the ventilator of the present invention, the ventilator does not need to communicate with the cardiopulmonary resuscitation machine. Cardiopulmonary resuscitation information can be obtained by detecting the airway flow during cardiopulmonary resuscitation, so that the ventilator is not restricted by the communication protocol, and can effectively and quickly ventilate all compressions of the cardiopulmonary resuscitation machine as required, greatly improving the quality of cardiopulmonary resuscitation and first aid and the rescue rate; when manual compression is used for cardiopulmonary resuscitation, the information of manual compression can be accurately obtained through feedback analysis of the airway flow, and ventilation can be automatically coordinated with manual compression, thereby improving the accuracy and efficiency of ventilator ventilation; therefore, the present invention can enable the efficient application of ventilators.

[0051] The cardiopulmonary resuscitation airway flow automatic feedback ventilation method and ventilator described in the present invention, and other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will also be understood by technicians in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0053] Figure 1 It is a schematic diagram of the ventilator with automatic airway flow feedback ventilation for cardiopulmonary resuscitation according to the present invention working in coordination with cardiopulmonary resuscitation;

[0054] Figure 2 A block diagram of modules in a ventilator body of a ventilator for automatic airway flow feedback ventilation for cardiopulmonary resuscitation according to the present invention;

[0055] Figure 3 A schematic diagram of an unprocessed airway flow signal in a ventilator for airway flow automatic feedback ventilation for cardiopulmonary resuscitation according to the present invention;

[0056] Figure 4 A schematic diagram of an unprocessed airway flow signal and a processed airway flow signal in a ventilator for airway flow automatic feedback ventilation for cardiopulmonary resuscitation according to the present invention;

[0057] Figure 5 The present invention is a flow chart of the method for automatic airway flow feedback ventilation for cardiopulmonary resuscitation. DETAILED DESCRIPTION

[0058] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0059] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0060] like Figure 1 As shown, the present invention provides a ventilator with automatic feedback ventilation of airway flow during cardiopulmonary resuscitation, comprising: a ventilation circuit 2, connected to a ventilator body 1; a flow sensor 3 arranged on the ventilation circuit 2, communicatively connected to the ventilator body 1; when performing cardiopulmonary resuscitation, the ventilator body 1 performs ventilation operations according to the airway flow signal fed back by the flow sensor 3 and the set collaborative mode of compression and ventilation.

[0061] The ventilation pipeline 2 is also provided with a filter 5 and a breathing valve 6, and a pressure sensor 4 is also provided on the side of the flow sensor 3 close to the user. The flow sensor 3 and the pressure sensor 4 are both arranged at the end of the ventilation pipeline 2 close to the user; a mask 7 is provided at the end of the ventilation pipeline 2 away from the ventilator body 1.

[0062] Cardiopulmonary resuscitation can be performed by using a cardiopulmonary resuscitation machine or by manual compression. The ventilation parameters of the ventilator body 1 are set according to the set compression and ventilation coordination mode, wherein the ventilation parameters are the set compression frequency, the set number of presses and the set number of releases of cardiopulmonary resuscitation, and the set ratio of compression and ventilation (for example, 30:2); the mask 7 is used to cover the user's mouth and nose, and the mask 7 and the ventilator body 1 are connected through the ventilation pipeline 2, and then the ventilator body 1 can be started;

[0063] During cardiopulmonary resuscitation, the airway flow is detected by the flow sensor 3. During the compression process, the user's chest cavity changes, and the user is forced to exhale and inhale gas, thereby generating a certain change in airway flow. The resulting airflow inhalation and exhalation can be detected. When the chest cavity is pressed, the airway flow detected by the flow sensor 3 is negative. When the chest cavity is released, the airway flow detected by the flow sensor 3 is positive, so that the airway flow signal can be fed back to the ventilator body 1, that is, Figure 3 The flow curve during cardiopulmonary resuscitation is shown in Figure 1, where Figure 3 The lpm (liter per minute) in the chart stands for liters per minute and is a unit of flow rate.

[0064] After analyzing the airway flow signal, the ventilator body 1 can obtain cardiopulmonary resuscitation information, thereby performing ventilation operations on the user according to the set compression and ventilation coordination mode.

[0065] Through the above design, when a cardiopulmonary resuscitation machine is used to work in conjunction with the ventilator of the present invention, the ventilator does not need to communicate with the cardiopulmonary resuscitation machine. The cardiopulmonary resuscitation information can be obtained by detecting the airway flow during the cardiopulmonary resuscitation process, so that the ventilator is not restricted by the communication protocol, and can effectively and quickly ventilate all compressions of the cardiopulmonary resuscitation machine as required, greatly improving the quality of cardiopulmonary resuscitation and first aid and the rescue rate; when manual compression is used for cardiopulmonary resuscitation, the information of manual compression can be accurately obtained through feedback analysis of the airway flow, and ventilation can be automatically coordinated with manual compression, thereby improving the accuracy and efficiency of ventilator ventilation; therefore, the present invention can make the ventilator used efficiently.

[0066] like Figure 2 As shown, in one embodiment, it also includes: an acquisition module, a preprocessing module, an analysis module and a ventilation control module arranged in the ventilator body 1;

[0067] An acquisition module, used to acquire the airway flow signal fed back by the flow sensor 3;

[0068] A preprocessing module, used for processing the acquired airway flow signal to obtain a processed airway flow signal;

[0069] An analysis module is used to analyze the processed airway flow signal to obtain compression information of cardiopulmonary resuscitation, and obtain a ventilation time window based on the compression information and a set compression and ventilation coordination mode;

[0070] The ventilation control module is used to perform ventilation operations according to the obtained ventilation time window.

[0071] The acquisition module acquires the airway flow detected by the flow sensor 3 and forms Figure 3 The airway flow signal shown in the figure will contain too much ripple and zero value offset due to vibration or interference during compression and the damping effect of lung structure parameters. Therefore, the airway flow signal needs to be processed and then analyzed by the analysis module to obtain more accurate cardiopulmonary resuscitation compression information (number of presses and releases). Then, based on the compression information and the set compression and ventilation coordination mode, the ventilation time window can be obtained. The ventilation time window is the moment when ventilation can be performed. At this time, the ventilation control module can be used to perform ventilation operations on the user within the ventilation time window.

[0072] like Figure 4 As shown, further, the preprocessing module uses bandpass filtering to process the airway flow signal, including:

[0073] A preset unit, for presetting the center frequency of the bandpass filter according to the set compression frequency of cardiopulmonary resuscitation;

[0074] The processing unit is used to process the airway flow signal according to a preset bandpass filter to obtain a processed airway flow signal.

[0075] For example, if the compression frequency of cardiopulmonary resuscitation is set to 120 times / minute (i.e., 2 Hz), the center frequency of the bandpass filter is set to 2 Hz, and then the airway flow signal is filtered using the bandpass filter with the set center frequency to obtain Figure 4 The filtered signal shown in .

[0076] The previous one is processed by bandpass filtering. Figure 4 The airway flow curve corresponding to the medium flow (lpm) is Figure 3 The curve in is similar to that in the figure, with ripples and zero offset, but after bandpass filtering it is Figure 4 The airway flow curve corresponding to the filtered signal (ie, the processed airway flow signal) eliminates ripples and zero value offsets; then, the compression information obtained by analyzing the processed airway flow signal is more accurate.

[0077] Furthermore, the analysis module includes:

[0078] An identification and judgment unit identifies and judges the processed airway flow signal to obtain compression information of cardiopulmonary resuscitation; wherein the compression information includes: the number of presses and releases;

[0079] The coordinated ventilation judgment unit obtains the ventilation time window according to the compression information and the set compression and ventilation coordination mode.

[0080] Through the filtered signal, its crossover relationship with the zero-value baseline can be obtained, the compression frequency and phase of the cardiopulmonary resuscitation process can be identified, and then according to the set ratio of cardiopulmonary resuscitation compression and ventilation (for example, 30:2), the collaborative mode of ventilator and cardiopulmonary resuscitation can be realized.

[0081] Furthermore, the identification and judgment unit includes:

[0082] A threshold setting subunit, used to set a flow threshold;

[0083] The judgment subunit is used to judge the processed airway flow signal according to the flow threshold. If the airway flow is less than the negative flow threshold, the current state is the press state. If the airway flow is greater than the positive flow threshold, the current state is the release state. The press and release are counted to obtain the compression information of cardiopulmonary resuscitation.

[0084] exist Figure 3 and Figure 4The t shown in is the flow threshold. The identification and judgment unit judges the pressing and releasing according to the flow threshold. Since the airway flow detected by the flow sensor 3 is negative when the chest is pressed, when the airway flow is less than -t, it is judged that the current state is the pressing state. When the chest is released, the airway flow detected by the flow sensor 2 is positive. Therefore, when the airway flow is greater than t, it is judged that the current state is the releasing state. Then, the pressing and releasing are counted respectively to obtain the pressing times and releasing times of cardiopulmonary resuscitation, so as to obtain the pressing information of cardiopulmonary resuscitation according to the analysis of the airway flow signal.

[0085] Furthermore, the flow threshold includes: an initial threshold and a set threshold; at the beginning of cardiopulmonary resuscitation, the initial threshold is used to judge the processed airway flow signal; after the beginning of cardiopulmonary resuscitation, the set threshold is used to judge the processed airway flow signal;

[0086] The setting of the initial threshold includes: setting according to the user's gender, height and weight;

[0087] The setting of the set threshold includes: obtaining airway flow data within a first set time before the current moment, and weighting the airway flow data, selecting the maximum airway flow from the weighted airway flow data, and setting a set percentage of the maximum airway flow (for example: 50%) as the set threshold.

[0088] The airway flow data within the first set time before the current moment is the airway flow data within the last 5 to 10 seconds; the airway flow data may be weighted according to a time decay function, for example, as time goes by, the weight gradually decreases;

[0089] The flow threshold is preset with a corresponding set minimum value (e.g., 7 lpm). If the set threshold is less than the set minimum value, the set threshold is used as the set minimum value of the flow threshold.

[0090] Within a second set time (eg, 3 seconds) after the ventilation operation, no dynamic adjustment or update of the set threshold is performed.

[0091] By setting the flow threshold, a more accurate judgment can be made on the processed airway flow signal, thereby obtaining a more precise number of presses and releases, thereby improving the accuracy of ventilator ventilation.

[0092] In one embodiment, the coordinated ventilation determination unit includes:

[0093] The first judgment rule is that after the number of cardiopulmonary resuscitation presses reaches the set number of presses, the ventilation time window is determined;

[0094] The second judgment rule is that after the number of cardiopulmonary resuscitation releases obtained reaches the set number of releases, it is judged as the ventilation time window;

[0095] A third judgment rule, if no pressing is detected within a third set time, it is judged as a ventilation time window;

[0096] The calculation formula for the third setting time is:

[0097]

[0098] Wherein, T is the third set time, f and N0 are respectively the set compression frequency and the set number of presses in the set compression and ventilation coordination mode, and N1 is the number of presses obtained for cardiopulmonary resuscitation;

[0099] Among them, the number of compressions and releases of cardiopulmonary resuscitation is obtained based on the compression information, and the set number of compressions, the set number of releases, the set ratio of compressions and ventilations, the set number of ventilations and the set compression frequency are obtained based on the set compression and ventilation coordination mode.

[0100] For example, the compression and ventilation coordination mode set by the ventilator body 1 is that the compression and ventilation ratio is set to 15:2, the compression frequency is set to 100 times / minute, and the judgment rule of the ventilation time window (i.e., ventilation timing) is:

[0101] The first judgment rule is to ventilate after the next release when the number of presses reaches 15;

[0102] The second judgment rule is to ventilate after the release times reach 15 times;

[0103] The third judgment rule is that if no press is detected within the third set time, ventilation is performed; the third set time is calculated by the above formula; this rule is to enable the user to be ventilated in time when an abnormal situation occurs. The abnormal situation may be that the cardiopulmonary resuscitation machine has completed the number of presses, but the ventilator body 1 has errors in obtaining the number of presses and releases.

[0104] Furthermore, the coordinated ventilation determination unit further includes:

[0105] The fourth judgment rule is that when ventilation is performed, the counting of pressing and releasing is stopped; and after ventilation, the number of pressing and releasing is reset to zero, and the number of pressing and releasing is counted again;

[0106] The fifth judgment rule is to obtain the minute ventilation volume of multiple ventilations, and when the minute ventilation volume of multiple ventilations reaches the set minute ventilation volume, the ventilation operation is not triggered.

[0107] The fourth judgment rule can ensure the accuracy of counting each press and release; the minute ventilation in the fifth judgment rule refers to the total amount of gas entering or leaving the lungs per minute. During cardiopulmonary resuscitation, compression and ventilation need to be coordinated. The minute ventilation of multiple ventilations is guaranteed not to exceed the set minute ventilation. If the set minute ventilation is reached, the ventilation operation will not be triggered, and the operator will be prompted through the sound and interface of the ventilator body 1.

[0108] In one embodiment, it also includes: a guiding compression module, which is used to set the compression mode and compression frequency corresponding to cardiopulmonary resuscitation, and is also used to display the current number of cardiopulmonary resuscitation presses, and issue a prompt when the number of cardiopulmonary resuscitation presses is close to the set number of presses.

[0109] When the compression mode of cardiopulmonary resuscitation is manual compression, it is used to guide the operator to perform compressions according to the set compression frequency.

[0110] The ventilator also has a guided manual compression mode, which can pre-set ventilation parameters such as the set compression frequency, the set ratio of compression and ventilation, the set number of presses and the set number of releases of the ventilator body 1; during cardiopulmonary resuscitation, the ventilator body 1 can guide manual compression through sound and light according to the above settings, such as a prompt tone or screen flashing consistent with the set compression frequency, and the operator can perform cardiopulmonary resuscitation according to the frequency of the prompt tone and screen flashing; and during the compression process, the screen of the ventilator body 1 can simultaneously display the current number of presses to provide a reference for manual cardiopulmonary resuscitation; when the number of presses for cardiopulmonary resuscitation (for example, 10 times) is close to the set number of presses (for example, 15 times), for example, when the difference between the set number of presses and the current number of presses is 5 times, it is judged to be close, then the sound of the last 5 prompt tones gradually increases, or the color of the last 5 screen flashes changes, etc., to prompt the operator; after the current compression and ventilation are completed, the above steps are repeated to guide manual compression.

[0111] Through the above design, the ventilator body 1 can cooperate with the manual compression mode for ventilation, and can guide the manual compression operation, ensure the compression frequency and ventilation accuracy, so that the ventilator and manual compression can work better together.

[0112] like Figure 5 As shown, the present invention also provides a cardiopulmonary resuscitation airway flow automatic feedback ventilation method, which is applied to the cardiopulmonary resuscitation airway flow automatic feedback ventilation ventilator of the present invention, comprising:

[0113] S1. Obtaining the airway flow signal during cardiopulmonary resuscitation of the user;

[0114] S2, processing the airway flow signal using a preset bandpass filter to obtain a processed airway flow signal;

[0115] S3, judging the processed airway flow signal according to the flow threshold, if the airway flow is less than the negative flow threshold, the current state is the pressing state, if the airway flow is greater than the positive flow threshold, the current state is the releasing state, counting the pressing and releasing, and obtaining the pressing times and releasing times;

[0116] The flow threshold includes: an initial threshold and a set threshold; at the beginning of cardiopulmonary resuscitation, the initial threshold is used to judge the processed airway flow signal; after the beginning of cardiopulmonary resuscitation, the set threshold is used to judge the processed airway flow signal;

[0117] S4. Perform ventilation operations according to the number of presses and releases, as well as the set compression and ventilation coordination mode.

[0118] During cardiopulmonary resuscitation, the user's chest changes during compression, and the user is forced to exhale and inhale gas, resulting in certain airway flow changes. The airflow inhalation and exhalation caused can be detected. When the chest is pressed, the airway flow is negative, and when the chest is released, the airway flow is positive, so that the airway flow signal can be obtained; due to vibration or interference during compression and the damping effect of lung structure parameters, the airway flow signal will contain too much ripple and zero value offset, so the airway flow signal needs to be filtered to form the following: Figure 4 The filtered signal shown (i.e., the processed airway flow signal) is then judged using the flow threshold to obtain the number of compressions and releases for cardiopulmonary resuscitation, and then ventilation operations can be performed according to the set compression and ventilation coordination mode (including the information of: set number of compressions, set number of releases, set ratio of compressions and ventilations, set number of ventilations, and set compression frequency).

[0119] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0120] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0121] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the present invention, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A ventilator with automatic airway flow feedback ventilation for cardiopulmonary resuscitation, characterized in that: include: A ventilation pipeline (2) is connected to a ventilator body (1); a flow sensor (3) arranged on the ventilation pipeline (2) is connected to the ventilator body (1) for communication; when performing cardiopulmonary resuscitation, the ventilator body (1) performs ventilation operations according to the airway flow signal fed back by the flow sensor (3) and the set compression and ventilation coordination mode; It also includes: an acquisition module, a preprocessing module, an analysis module and a ventilation control module arranged in the ventilator body (1); An acquisition module, used for acquiring an airway flow signal fed back by a flow sensor (3); A preprocessing module, used for processing the acquired airway flow signal to obtain a processed airway flow signal; An analysis module is used to analyze the processed airway flow signal to obtain compression information of cardiopulmonary resuscitation, and obtain a ventilation time window based on the compression information and a set compression and ventilation coordination mode; A ventilation control module, used for performing ventilation operation according to the obtained ventilation time window; The analysis module comprises: An identification and judgment unit identifies and judges the processed airway flow signal to obtain compression information of cardiopulmonary resuscitation; wherein the compression information includes: the number of presses and releases; The coordinated ventilation judgment unit obtains the ventilation time window according to the compression information and the set coordinated mode of compression and ventilation; The identification and judgment unit comprises: A threshold setting subunit, used to set a flow threshold; A judgment subunit is used to judge the processed airway flow signal according to the flow threshold. If the airway flow is less than the negative flow threshold, the current state is a press state. If the airway flow is greater than the positive flow threshold, the current state is a release state. The press and release are counted to obtain the compression information of cardiopulmonary resuscitation. The flow threshold includes: an initial threshold and a set threshold; at the beginning of cardiopulmonary resuscitation, the initial threshold is used to judge the processed airway flow signal; after the beginning of cardiopulmonary resuscitation, the set threshold is used to judge the processed airway flow signal; The setting of the initial threshold includes: setting according to the user's gender, height and weight; The setting of the set threshold includes: obtaining airway flow data within a first set time before the current moment, and weighting the airway flow data, selecting the maximum airway flow from the weighted airway flow data, and using the set percentage of the maximum airway flow as the set threshold.

2. The ventilator with automatic airway flow feedback ventilation for cardiopulmonary resuscitation according to claim 1, characterized in that: The preprocessing module processes the airway flow signal using bandpass filtering, including: A preset unit, for presetting the center frequency of the bandpass filter according to the set compression frequency of cardiopulmonary resuscitation; The processing unit is used to process the airway flow signal according to a preset bandpass filter to obtain a processed airway flow signal.

3. The ventilator with automatic airway flow feedback ventilation for cardiopulmonary resuscitation according to claim 1, characterized in that: The coordinated ventilation determination unit comprises: The first judgment rule is that after the number of cardiopulmonary resuscitation presses reaches the set number of presses, the ventilation time window is determined; The second judgment rule is that after the number of cardiopulmonary resuscitation releases obtained reaches the set number of releases, it is judged as the ventilation time window; The third judgment rule is that if no press is detected within the third set time, it is judged as the ventilation time window.

4. The ventilator with automatic airway flow feedback ventilation for cardiopulmonary resuscitation according to claim 3, characterized in that: The coordinated ventilation determination unit further includes: The fourth judgment rule is that when ventilation is performed, the counting of pressing and releasing is stopped; and after ventilation, the number of pressing and releasing is reset to zero, and the number of pressing and releasing is counted again; The fifth judgment rule is to obtain the minute ventilation volume of multiple ventilations, and when the minute ventilation volume of multiple ventilations reaches the set minute ventilation volume, the ventilation operation is not triggered.

5. The ventilator with automatic airway flow feedback ventilation for cardiopulmonary resuscitation according to claim 1, characterized in that: Also includes: The guided compression module is used to set the compression mode and compression frequency corresponding to cardiopulmonary resuscitation, and is also used to display the current number of cardiopulmonary resuscitation presses, and to issue a prompt when the number of cardiopulmonary resuscitation presses is close to the set number of presses.

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