Cardiopulmonary resuscitation airway flow automatic feedback ventilation method and ventilator

Abstract

The present invention relates to the technical field of ventilators. Particularly disclosed are a cardiopulmonary resuscitation airway flow automatic feedback ventilation method and a ventilator. The ventilator comprises: a ventilation tube, connected to a ventilator main body; and a flow sensor arranged on the ventilation tube, in communication connection with the ventilator main body. During cardiopulmonary resuscitation, the ventilator main body performs a ventilation operation according to an airway flow signal fed back by the flow sensor and a set collaborative mode of compression and ventilation. When a cardiopulmonary resuscitation machine is used in cooperation with the ventilator, cardiopulmonary resuscitation information can be obtained by detecting the airway flow during cardiopulmonary resuscitation, and the ventilator is not limited by a communication protocol; for compression performed by any cardiopulmonary resuscitation machine, the ventilator can perform effective and rapid ventilation according to requirements, thereby improving the quality and survival rate of cardiopulmonary resuscitation first aid. When manual compression is used for cardiopulmonary resuscitation, compression information can be accurately obtained by means of feedback analysis of the airway flow, and the ventilator can automatically cooperate with manual compression and perform ventilation, thereby improving the ventilation accuracy and efficiency of the ventilator.

Description

An automatic feedback ventilation method and ventilator for cardiopulmonary resuscitation Technical Field

[0001] This invention relates to the field of ventilator technology, and more specifically, to a method for automatic feedback ventilation of airway flow during cardiopulmonary resuscitation and a ventilator. Background Technology

[0002] Cardiopulmonary resuscitation (CPR) is the most basic and important medical method to save the lives of patients with cardiac arrest. Chest compressions combined with forced ventilation are usually the rescue methods that these patients need to obtain as soon as possible to maintain basic blood circulation, heartbeat and respiratory recovery.

[0003] Existing cardiopulmonary resuscitation typically includes two important components: chest compressions and ventilation (breathing);

[0004] Chest compressions typically take two forms: manual compressions and mechanical (equipment) compressions. Manual compressions are used when manual compressions are not available; mechanical (equipment) compressions are used when available in a hospital setting. Clinical requirements for compressions generally follow these guidelines: an effective chest compression rate of 100-120 compressions per minute and a depth of 5-6 centimeters.

[0005] Ventilation (breathing) in cardiopulmonary resuscitation usually involves: artificial respiration, bag ventilation, and mechanical ventilation. The ventilation requirements are based on clinical needs and can be coordinated with 2 ventilations in the middle of 30 compressions, 2 ventilations in 15 compressions, or 1 ventilation in every 10 compressions without interruption.

[0006] In existing technologies, chest compressions combined with positive pressure ventilation are performed at a compression rate of 100-120 times per minute and a depth of 5-6 centimeters, with 2 breaths in the middle of 30 compressions (these parameters refer to adult patients of average size). The coordination of compressions and ventilation in cardiopulmonary resuscitation is usually coordinated by medical staff, or the cardiopulmonary resuscitation compression equipment and ventilator work together through a communication protocol, and cannot be automatically coordinated.

[0007] In addition, the coordination of CPR compressions and ventilation is difficult to control precisely and stably for a long time using manual coordination methods; while the method of coordinating CPR compression equipment with a ventilator is limited by whether the equipment has a coordination function and by the stability of the signal connection between the equipment.

[0008] Furthermore, current ventilators do not have an automatic ventilation recognition function and cannot initiate ventilation coordination actions based on airway flow signals;

[0009] These problems limit the effectiveness of ventilators in treating patients.

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

[0011] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0012] To at least partially solve the above problems, the present invention provides a ventilator with automatic airway flow feedback ventilation for cardiopulmonary resuscitation, comprising: a ventilation tubing connected to the ventilator body; a flow sensor disposed on the ventilation tubing and communicatively connected to the ventilator body; during cardiopulmonary resuscitation, the ventilator body performs ventilation operations based on the airway flow signal fed back by the flow sensor and a set coordinated compression and ventilation mode.

[0013] Preferably, it also includes: an acquisition module, a preprocessing module, an analysis module, and a ventilation control module disposed within the main body of the ventilator;

[0014] The acquisition module is used to acquire the airway flow signal fed back by the flow sensor;

[0015] The preprocessing module is used to process the acquired airway flow signal to obtain the processed airway flow signal;

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

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

[0018] Preferably, the preprocessing module uses bandpass filtering to process the airway flow signal, including:

[0019] The preset unit presets the center frequency of the bandpass filter based on 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 the processed airway flow signal.

[0021] Preferably, the analysis module includes:

[0022] The identification and judgment unit identifies and judges the processed airway flow signal to obtain the compression information for cardiopulmonary resuscitation; wherein, the compression information includes: the number of times the pressure is pressed down and released;

[0023] The coordinated ventilation judgment unit determines the ventilation time window based on the compression information and the set coordinated compression and ventilation mode.

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

[0025] The threshold setting subunit is used to set the flow threshold;

[0026] The judgment subunit is used to judge the processed airway flow signal based on the flow threshold. If the airway flow is less than the negative flow threshold, the current state is pressing down; if the airway flow is greater than the positive flow threshold, the current state is releasing. The pressing down and releasing 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 initial threshold setting includes: setting it based on the user's gender, height, and weight;

[0029] The setting of the threshold includes: acquiring airway flow data within a first set time period before the current time, 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 includes:

[0031] The first judgment rule is that, after the number of CPR compressions is reached, the next release after the set number of compressions is considered the time window for ventilation.

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

[0033] The third judgment rule is that if no downward press is detected within the third set time period, it is judged as the time window for ventilation.

[0034] The formula for calculating the third set time is as follows:

[0035]

[0036] in, Set a time for the third. and These are the set compression frequency and set number of presses in the combined compression and ventilation mode. The number of chest compressions performed during cardiopulmonary resuscitation;

[0037] Specifically, based on the compression information, the number of compressions and releases for cardiopulmonary resuscitation are obtained; based on the set compression and ventilation coordination mode, 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.

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

[0039] The fourth judgment rule is to stop counting down and release during ventilation; and after ventilation, reset the number of down and release counts to zero and start counting down and release again.

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

[0041] Preferably, it also includes: a guided compression module, used to set the compression mode and compression frequency corresponding to cardiopulmonary resuscitation, and also used to display the current number of compressions for cardiopulmonary resuscitation, and to issue a prompt when the number of compressions for cardiopulmonary resuscitation approaches the set number of compressions.

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

[0043] An automatic airway flow feedback ventilation method for cardiopulmonary resuscitation, applied to the ventilator for automatic airway flow feedback ventilation in cardiopulmonary resuscitation as described in this invention, comprising:

[0044] Acquire airway flow signals during cardiopulmonary resuscitation;

[0045] The airway flow signal is processed using a pre-set bandpass filter to obtain the processed airway flow signal;

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

[0047] The flow threshold includes an initial threshold and a set threshold. At the beginning of cardiopulmonary resuscitation (CPR), the initial threshold is used to judge the processed airway flow signal. After the beginning of CPR, the set threshold is used to judge the processed airway flow signal.

[0048] Ventilation is performed based on the number of presses and releases, as well as the set coordination mode for presses and ventilation.

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

[0050] The automatic airway flow feedback ventilation method and ventilator for cardiopulmonary resuscitation (CPR) described in this invention, when used in conjunction with the CPR machine, eliminate the need for communication between the ventilator and the CPR machine. CPR information is obtained by detecting airway flow during CPR, thus freeing the ventilator from communication protocol limitations and enabling effective and rapid ventilation according to all CPR compressions, significantly improving the quality and survival rate of CPR. When performing manual CPR, the feedback analysis of airway flow accurately reveals the information from manual compressions, allowing for automatic ventilation in coordination with manual compressions, thereby enhancing the accuracy and efficiency of ventilator ventilation. Therefore, this invention enables the efficient application of ventilators.

[0051] The automatic airway flow feedback ventilation method and ventilator for cardiopulmonary resuscitation described in this invention, along with other advantages, objectives, and features of this invention, will be partly apparent from the following description and partly understood by those skilled in the art through study and practice of the invention. Attached Figure Description

[0052] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0053] Figure 1 is a schematic diagram of the ventilator with automatic airway flow feedback ventilation for cardiopulmonary resuscitation described in this invention working in conjunction with cardiopulmonary resuscitation.

[0054] Figure 2 is a block diagram of the modules inside the main body of the ventilator in the cardiopulmonary resuscitation airway flow automatic feedback ventilation ventilator of the present invention.

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

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

[0057] Figure 5 is a flowchart of the automatic feedback ventilation method for cardiopulmonary resuscitation airway flow according to the present invention. Detailed Implementation

[0058] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

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

[0060] As shown in Figure 1, the present invention provides a ventilator with automatic airway flow feedback ventilation for cardiopulmonary resuscitation, comprising: a ventilation tubing 2 connected to the ventilator body 1; a flow sensor 3 disposed on the ventilation tubing 2 and communicatively connected to the ventilator body 1; during cardiopulmonary resuscitation, the ventilator body 1 performs ventilation operation based on the airway flow signal fed back by the flow sensor 3 and the set coordinated compression and ventilation mode.

[0061] The ventilation line 2 is also equipped with a filter 5 and a breathing valve 6. A pressure sensor 4 is also provided on the side of the flow sensor 3 closer to the user. Both the flow sensor 3 and the pressure sensor 4 are located at the end of the ventilation line 2 closer to the user. A mask 7 is provided at the end of the ventilation line 2 away from the ventilator body 1.

[0062] Cardiopulmonary resuscitation (CPR) can be performed using a CPR machine or by manual chest compressions. The ventilation parameters of the ventilator body 1 are set according to the preset compression and ventilation coordination mode. The ventilation parameters include the set compression rate, set number of compressions and releases, and set compression-to-ventilation ratio (e.g., 30:2). The mask 7 is used to cover the user's mouth and nose. The mask 7 and the ventilator body 1 are connected through the ventilation tubing 2. Then the ventilator body 1 can be started.

[0063] During cardiopulmonary resuscitation (CPR), airway flow is detected by flow sensor 3. During chest compressions, changes occur in the user's chest cavity, forcing the user to exhale and inhale air, resulting in changes in airway flow. Both inhalation and exhalation can be detected. When the chest cavity is compressed, the airway flow detected by flow sensor 3 is negative, and when the chest cavity is released, the airway flow detected by flow sensor 3 is positive. This allows the airway flow signal to be fed back to the ventilator body 1, as shown in the flow curve during CPR in Figure 3. In Figure 3, lpm (liters per minute) represents liters per minute, which is a unit of flow rate.

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

[0065] Through the above design, when the cardiopulmonary resuscitation (CPR) machine is used in conjunction with the ventilator of this invention, the ventilator does not need to communicate with the CPR machine. CPR information can be obtained by detecting airway flow during CPR, thus freeing the ventilator from communication protocol limitations. It can effectively and rapidly ventilate according to the requirements of all CPR compressions, greatly improving the quality and survival rate of CPR. When performing manual CPR, feedback analysis of airway flow accurately obtains information about manual compressions, enabling automatic coordination with manual compressions for ventilation, thereby improving the accuracy and efficiency of ventilator ventilation. Therefore, this invention enables the efficient application of ventilators.

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

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

[0068] The preprocessing module is used to process the acquired airway flow signal to obtain the processed airway flow signal;

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

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

[0071] The acquisition module acquires the airway flow detected by the flow sensor 3, forming an airway flow signal as shown in Figure 3. Vibration or interference during compression and the damping effect of lung structural parameters can cause the airway flow signal to contain excessive ripple and zero-value shift. Therefore, the airway flow signal needs to be processed. Then, the analysis module analyzes the processed airway flow signal to obtain more accurate compression information for cardiopulmonary resuscitation (number of compressions and releases). 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 time when ventilation can be performed. At this time, the ventilation control module can perform ventilation operations on the user within the ventilation time window.

[0072] As shown in Figure 4, the preprocessing module further processes the airway flow signal using bandpass filtering, including:

[0073] The preset unit presets the center frequency of the bandpass filter based on 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 the processed airway flow signal.

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

[0076] Before bandpass filtering, the airway flow curve corresponding to the flow rate (lpm) in Figure 4 is similar to the curve in Figure 3, exhibiting ripple and zero-value offset. After bandpass filtering, the airway flow curve corresponding to the filtered signal in Figure 4 (i.e., the processed airway flow signal) is obtained, eliminating ripple and zero-value offset. Then, the compression information obtained by analyzing the processed airway flow signal is more accurate.

[0077] Furthermore, the analysis module includes:

[0078] The identification and judgment unit identifies and judges the processed airway flow signal to obtain the compression information for cardiopulmonary resuscitation; wherein, the compression information includes: the number of times the pressure is pressed down and released;

[0079] The coordinated ventilation judgment unit determines the ventilation time window based on the compression information and the set coordinated compression and ventilation mode.

[0080] By using the filtered signal, we can obtain its intersection with the zero baseline, identify the compression frequency and phase during cardiopulmonary resuscitation (CPR), and then, based on the set ratio of compressions to ventilations during CPR (e.g., 30:2), we can achieve a coordinated mode of ventilator and CPR.

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

[0082] The threshold setting subunit is used to set the flow threshold;

[0083] The judgment subunit is used to judge the processed airway flow signal based on the flow threshold. If the airway flow is less than the negative flow threshold, the current state is pressing down; if the airway flow is greater than the positive flow threshold, the current state is releasing. The pressing down and releasing are counted to obtain the compression information of cardiopulmonary resuscitation.

[0084] In Figures 3 and 4, t represents the flow threshold. The identification and judgment unit uses the flow threshold to determine the compression and release states. Since the airway flow detected by flow sensor 3 is negative when compressing the chest cavity, the current state is determined to be compression when the airway flow is less than -t. Conversely, the airway flow detected by flow sensor 2 is positive when releasing the chest cavity, so the current state is determined to be release when the airway flow is greater than t. The compression and release states are then counted separately to obtain the number of compressions and releases during cardiopulmonary resuscitation, thereby enabling the acquisition of cardiopulmonary resuscitation compression information based on airway flow signal analysis.

[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 initial threshold setting includes: setting it based on the user's gender, height, and weight;

[0087] The setting of the threshold includes: acquiring airway flow data within a first set time period before the current time, weighting the airway flow data, selecting the maximum airway flow from the weighted airway flow data, and using a set percentage (e.g., 50%) of the maximum airway flow as the threshold.

[0088] Among them, the airway flow data within the first set time period before the current moment is the airway flow data within the most recent 5 to 10 seconds; the weighting method for the airway flow data can be based on a time decay function, for example, the weight gradually decreases as time goes forward;

[0089] The traffic threshold has a preset minimum value (e.g., 7 lpm). If the preset threshold is less than the minimum value, the preset threshold will be used as the minimum value of the traffic threshold.

[0090] No dynamic adjustment or update of the set threshold is performed within a second set time period (e.g., within 3 seconds) after the ventilation operation.

[0091] By setting a 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, and 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 CPR compressions is reached, the next release after the set number of compressions is considered the time window for ventilation.

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

[0095] The third judgment rule is that if no downward press is detected within the third set time period, it is judged as the time window for ventilation.

[0096] The formula for calculating the third set time is as follows:

[0097]

[0098] in, Set a time for the third. and These are the set compression frequency and set number of presses in the combined compression and ventilation mode. The number of chest compressions performed during cardiopulmonary resuscitation;

[0099] Specifically, based on the compression information, the number of compressions and releases for cardiopulmonary resuscitation are obtained; based on the set compression and ventilation coordination mode, 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.

[0100] For example, the ventilator body 1 is set to a coordinated compression and ventilation mode with a compression-to-ventilation ratio of 15:2, a compression rate of 100 compressions / minute, and a ventilation time window (i.e., ventilation timing) determined by the following rules:

[0101] The first judgment rule is to allow airflow after the next release when the number of presses reaches 15.

[0102] The second judgment rule is to allow ventilation after 15 releases.

[0103] The third judgment rule is to perform ventilation if no press is detected within the third set time. The third set time is calculated using the formula mentioned above. This rule is to ensure timely ventilation for the user in case of abnormal situations. Abnormal situations may occur when the cardiopulmonary resuscitation machine has completed the number of compressions, but the ventilator body 1 has errors in obtaining the number of presses and releases.

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

[0105] The fourth judgment rule is to stop counting down and release during ventilation; and after ventilation, reset the number of down and release counts to zero and start counting down and release again.

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

[0107] The fourth judgment rule ensures the accuracy of the count for 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 must not 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 by the sound and interface of the ventilator body 1.

[0108] In one embodiment, the system further includes a guided compression module, which is used to set the compression mode and compression frequency corresponding to cardiopulmonary resuscitation (CPR), and to display the current number of compressions for CPR, and to issue a prompt when the number of compressions for CPR approaches the set number of compressions.

[0109] When the compression mode in 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 features a guided chest compression mode, which allows for pre-setting of ventilation parameters such as the set compression frequency, compression-to-ventilation ratio, set number of compressions, and set number of releases on the ventilator body 1. During cardiopulmonary resuscitation (CPR), the ventilator body 1 can guide chest compressions through sound and light based on the aforementioned settings. For example, a prompt sound or screen flashing consistent with the set compression frequency will guide the operator to perform CPR based on the frequency of the prompt sound and screen flashing. Furthermore, during compressions, the screen of the ventilator body 1 can simultaneously display the current number of compressions, providing a reference for CPR. When the number of compressions (e.g., 10) approaches the set number of compressions (e.g., 15), for example, if the difference between the set number of compressions and the current number of compressions is 5, it is considered close. In this case, the sound of the last 5 compressions will gradually increase, or the color of the screen flashing will change during the last 5 compressions, to alert the operator. After this compression and ventilation cycle is completed, the aforementioned guided chest compressions can be repeated.

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

[0112] As shown in Figure 5, the present invention also provides an automatic airway flow feedback ventilation method for cardiopulmonary resuscitation, applied to the ventilator for automatic airway flow feedback ventilation in cardiopulmonary resuscitation described in the present invention, comprising:

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

[0114] S2. The airway flow signal is processed by a pre-set bandpass filter to obtain the processed airway flow signal.

[0115] S3. Based on the flow threshold, the processed airway flow signal is judged. If the airway flow is less than the negative flow threshold, the current state is the press-down state. If the airway flow is greater than the positive flow threshold, the current state is the release state. The press-down and release are counted to obtain the number of press-downs and releases.

[0116] The flow threshold includes an initial threshold and a set threshold. At the beginning of cardiopulmonary resuscitation (CPR), the initial threshold is used to judge the processed airway flow signal. After the beginning of CPR, the set threshold is used to judge the processed airway flow signal.

[0117] S4. Perform ventilation operation based on the number of presses and releases, as well as the set coordination mode of presses and ventilation.

[0118] During cardiopulmonary resuscitation (CPR), changes occur in the user's chest cavity during chest compressions, forcing the user to exhale and inhale air, resulting in changes in airway flow. Both inhalation and exhalation can be detected. When the chest cavity is compressed, the airway flow is negative; when the chest cavity is released, the airway flow is positive, thus allowing the acquisition of the airway flow signal. Due to vibrations or interference during compressions and the damping effect of lung structural parameters, the airway flow signal may contain excessive ripple and zero-value shifts. Therefore, the airway flow signal needs to be filtered to form a filtered signal as shown in Figure 4 (i.e., the processed airway flow signal). Then, the filtered signal is judged using a flow threshold to obtain the number of compressions and releases during CPR. Based on the set compression and ventilation coordination mode (including information such as: set number of compressions, set number of releases, set compression and ventilation ratio, set number of ventilations, and set compression frequency), ventilation operations can be performed.

[0119] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0120] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

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

Claims

1. A ventilator with automatic airway flow feedback ventilation for cardiopulmonary resuscitation, characterized in that, include: Ventilation tubing (2) is connected to the ventilator body (1); flow sensor (3) installed on ventilation tubing (2) is connected to the ventilator body (1) in communication; during cardiopulmonary resuscitation, the ventilator body (1) performs ventilation operation based on the airway flow signal fed back by 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 installed in the main body of the ventilator (1); The acquisition module is used to acquire the airway flow signal fed back by the flow sensor (3); The preprocessing module is used to process the acquired airway flow signal to obtain the processed airway flow signal; The analysis module is used to analyze the processed airway flow signal, obtain the compression information of cardiopulmonary resuscitation, and obtain the ventilation time window based on the compression information and the set compression and ventilation coordination mode. The ventilation control module is used to perform ventilation operations based on the obtained ventilation time window. The analysis module includes: The identification and judgment unit identifies and judges the processed airway flow signal to obtain the compression information for cardiopulmonary resuscitation; wherein, the compression information includes: the number of times the pressure is pressed down and released; The coordinated ventilation judgment unit obtains the ventilation time window based on the compression information and the set coordinated compression and ventilation mode; The identification and judgment unit includes: The threshold setting subunit is used to set the flow threshold; The judgment subunit is used to judge the processed airway flow signal based on the flow threshold. If the airway flow is less than the negative flow threshold, the current state is pressing down; if the airway flow is greater than the positive flow threshold, the current state is releasing. The pressing down and releasing 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 initial threshold setting includes: setting it based on the user's gender, height, and weight; The setting of the threshold includes: acquiring airway flow data within a first set time period before the current time, 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 for automatic airway flow feedback ventilation in cardiopulmonary resuscitation according to claim 1, characterized in that, The preprocessing module uses bandpass filtering to process the airway flow signal, including: The preset unit presets the center frequency of the bandpass filter based on 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 the processed airway flow signal.

3. The ventilator for automatic airway flow feedback ventilation in cardiopulmonary resuscitation according to claim 1, characterized in that, The coordinated ventilation determination unit includes: The first judgment rule is that, after the number of CPR compressions is reached, the next release after the set number of compressions is considered the time window for ventilation. The second judgment rule is that once the number of cardiopulmonary resuscitation releases reaches the set number, it is judged as the ventilation time window; The third judgment rule is that if no downward press is detected within the third set time period, it is judged as the time window for ventilation.

4. The ventilator for automatic airway flow feedback ventilation in cardiopulmonary resuscitation according to claim 3, characterized in that, The coordinated ventilation determination unit also includes: The fourth judgment rule is to stop counting down and release during ventilation; and after ventilation, reset the number of down and release counts to zero and start counting down and release again. The fifth judgment rule is to obtain the minute ventilation volume of multiple ventilations, and not to trigger the ventilation operation when the minute ventilation volume of multiple ventilations reaches the set minute ventilation volume.

5. The ventilator for automatic airway flow feedback ventilation in 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 CPR, and also to display the current number of CPR compressions, and to issue a prompt when the number of CPR compressions approaches the set number of compressions.

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