Cardiopulmonary resuscitation device and method

Abstract

A cardiopulmonary resuscitation device comprises a compression module for compressing the chest of a patient, configured to perform compression actions according to control signals from a calculation module; a chest height sensing module configured to monitor and transmit a patient chest height signal; a pulse sensing module configured to monitor and transmit a patient raw pulse signal; an oxygen saturation sensing module configured to monitor and transmit a patient oxygen saturation signal; a ventilation module configured to deliver breathing gas to the airway of the patient; the calculation module receives the patient chest height signal, the raw pulse signal and the oxygen saturation signal, wherein when the patient is placed under the compression module to receive cardiopulmonary resuscitation, the calculation module adjusts at least one working parameter of the compression module and / or the ventilation module in a manner associated with the patient chest height signal, the raw pulse signal and the oxygen saturation signal, the device provides the patient with variable parameter compression and ventilation by mechanical automation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cardiopulmonary resuscitation, and in particular to a cardiopulmonary resuscitation device and method. BACKGROUND

[0002] Cardiopulmonary resuscitation (CPR) is an emergency measure used to treat patients who have suffered from cardiac arrest. This method maintains the brain function of the patient by simulating the function of the heart and respiratory organs until the patient naturally resumes breathing and blood circulation. If a cardiac arrest patient is not given CPR in time, the tissues and organs will suffer irreversible damage after 4 to 6 minutes. Therefore, when a cardiac arrest occurs, CPR must be performed immediately to gain time for further rescue of the patient.

[0003] The principle of cardiopulmonary resuscitation is to make the heart produce airflow through external force, so as to maintain the normal operation of the body's basic circulatory system. When performing cardiopulmonary resuscitation, the rescuer will perform chest compression to allow the patient's heart to be subjected to sufficient pressure, so that the blood in the heart is forced to flow out. When the chest compression is released, the patient will inhale fresh oxygen, and at the same time the lungs will also expand with the airflow, promoting oxygen inhalation. Chest compression is an operation method of compressing the chest and heart to squeeze the heart to produce airflow.

[0004] However, even for professionals, the frequency and depth of chest compression are difficult to achieve the ideal compression standard of consistency and efficiency. This is because chest compression requires a certain skill, and the body structure and state of each person are different, so it is difficult to operate accurately. If the compression degree is too shallow, the effective compression effect cannot be achieved, and if the compression degree is too deep, it may cause excessive collapse of the patient's chest, even cause the patient's sternum to be fractured, thereby causing secondary injury to the patient.

[0005] In addition, how to timely determine whether the patient has restored spontaneous circulation (ROSC), and stop chest compression after the patient has restored spontaneous circulation is also one of the problems to be solved. If the patient has restored spontaneous circulation, chest compression is still performed, which will cause excessive compression of the patient's heart, reduce coronary blood flow, cause myocardial ischemia and even necrosis, or affect the normal heart rhythm, and even cause cardiac arrest.

[0006] In addition, on the one hand, due to the difference in understanding of those skilled in the art; on the other hand, due to the fact that the applicant has studied a large number of literatures and patents when making the present application, but due to the limitation of space, all the details and contents are not listed in detail, but this does not mean that the present application does not have these prior art characteristics. On the contrary, the present application has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art in the background art. SUMMARY

[0007] In view of the shortcomings of the prior art, the present application provides a cardiopulmonary resuscitation device, comprising,

[0008] The compression module is configured to compress the chest of the patient according to the control signal from the calculation module.

[0009] The chest height sensing module is configured to monitor and transmit the chest height signal of the patient.

[0010] The pulse sensing module is configured to monitor and transmit the original pulse signal of the patient.

[0011] The blood oxygen sensing module is configured to monitor and transmit the blood oxygen saturation signal of the patient.

[0012] The ventilation module is configured to deliver breathing gas to the airway of the patient.

[0013] Further comprising a calculation module, which receives the chest height signal, the original pulse signal and the blood oxygen saturation signal of the patient, wherein when the patient is placed under the compression module to receive cardiopulmonary resuscitation, the calculation module adjusts at least one working parameter of the compression module and / or the ventilation module in a manner associated with the chest height signal, the original pulse signal and the blood oxygen saturation signal of the patient.

[0014] Preferably, in the case that the chest height sensing module detects two chest heights of the patient when the compression module is pressed and lifted and transmits them to the calculation module, the calculation module can determine the chest collapse height of the patient based on the difference between the two chest heights, and then when the chest collapse height is in a first range, the calculation module controls the ventilation module to deliver oxygen to the patient at a first gas delivery amount.

[0015] Preferably, when the chest collapse height is in a second range, the calculation module controls the ventilation module to deliver oxygen to the patient at a second gas delivery amount, wherein the first range has a larger value than the second range, and the second gas delivery amount has a smaller value than the first gas delivery amount.

[0016] Preferably, the computing module is capable of adjusting the value of the first gas delivery amount given by the ventilation module in the case that the blood oxygen saturation signal of the patient is determined to be at a position in its corresponding blood oxygen saturation interval, wherein the first gas delivery amount is configured to be a first level gas delivery amount when the blood oxygen saturation signal is below the lower limit of the blood oxygen saturation interval, and the first gas delivery amount is configured to be a second level gas delivery amount when the blood oxygen saturation signal is above the lower limit of the blood oxygen saturation interval, the first level gas delivery amount being greater than the second level gas delivery amount.

[0017] Preferably, the computing module determines the manner of adjustment of the first gas delivery amount in the second level gas delivery amount based on a prediction of the trend of the blood oxygen saturation when the blood oxygen saturation signal is above the lower limit of the corresponding blood oxygen saturation interval.

[0018] Preferably, the first gas delivery amount is varied in a manner that the ventilation amount is gradually decreased with the number of compressions within the second level gas delivery amount in the case that the current blood oxygen saturation signal is in a trend of increasing.

[0019] Preferably, the first gas delivery amount is varied in a manner that the ventilation amount is gradually increased with the number of compressions within the second level gas delivery amount in the case that the current blood oxygen saturation signal is in a trend of decreasing, and the first gas delivery amount is switched to the first level gas delivery amount when the blood oxygen saturation signal is below the lower limit of the blood oxygen saturation interval.

[0020] Preferably, the computing module compares the patient chest height signal with a preset "chest collapse degree - compression number" relationship curve, and outputs a compression depth control signal, the compression module determines the compression depth according to the compression depth control signal and performs the corresponding compression action.

[0021] Preferably, the computing module outputs the compression depth control signal to control the compression module to reduce the compression depth in the case that the chest collapse height is greater than the expected chest collapse degree based on the relationship curve.

[0022] Preferably, the blood oxygen saturation interval varies based on different patient classifications.

[0023] A cardiopulmonary resuscitation method, configured with a compression module capable of performing automatic compression action on a patient, the compression action being capable of being controlled and adjusted, a ventilation module capable of ventilating the patient, the ventilation being capable of being controlled and adjusted, the method comprising the following contents: monitoring the patient chest height signal; monitoring the patient's original pulse signal; monitoring the patient's blood oxygen saturation signal; when the patient is placed under the compression module to receive cardiopulmonary resuscitation, adjusting at least one working parameter of the compression module and / or the ventilation module in a manner associated with the patient's chest height signal, the original pulse signal and the blood oxygen saturation signal.

[0024] The scheme has the advantages that:

[0025] 1. By monitoring the changes of the patient's chest height signal and blood oxygen concentration signal, the ventilation volume is controlled in real time to avoid over-ventilation; and according to the different degrees of patient's chest collapse, the patient is ventilated with different ventilation volumes to better simulate the human exhalation and inhalation process, and ensure the effect of cardiopulmonary resuscitation ventilation.

[0026] 2. According to the real-time chest height of the patient, the compression depth is adaptively adjusted to achieve better external chest compression effect and avoid bone fracture of the patient's sternum caused by excessive compression depth.

[0027] 3. By real-time monitoring and analysis of the patient's pulse and blood oxygen signals, it is judged whether the patient has recovered spontaneous circulation (ROSC), and the compression depth or cardiopulmonary resuscitation is stopped according to the pulse and blood oxygen value. Avoid continuing to perform cardiopulmonary resuscitation on the patient after the patient has recovered spontaneous circulation, thereby causing excessive compression of the patient's heart, reducing coronary blood flow, leading to myocardial ischemia and even necrosis, or affecting the normal heart rhythm, even leading to cardiac arrest, and causing cardiopulmonary resuscitation failure.

[0028] 4. Mechanical instead of manual compression can ensure the accuracy of compression depth, force and frequency, and improve resuscitation efficiency.

[0029] 5. Mechanical instead of manual compression can reduce the fatigue of the compression personnel, avoid the compression personnel from being unable to achieve the compression effect due to fatigue, or frequently exchange the compression and ventilation personnel during the resuscitation process, and reduce the rescue burden of the rescue personnel. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is the device control logic diagram provided by the application.

[0031] Reference signs:

[0032] 100: compression module; 101: pushing unit; 200: chest height sensing module;

[0033] 300: pulse sensing module; 400: blood oxygen sensing module; 500: calculation module;

[0034] 600: ventilation module; 700: indication module. DETAILED DESCRIPTION

[0035] The following will be described in detail in conjunction with the drawings.

[0036] Cardiopulmonary resuscitation (CPR) is an emergency measure for treating patients with cardiac arrest. This method simulates the functions of the heart and respiratory organs to maintain the brain function of the patient until the patient naturally resumes breathing and blood circulation. If the patient with cardiac arrest fails to receive CPR in time, the tissues and organs will suffer irreversible damage after 4 to 6 minutes. Therefore, when cardiac arrest occurs, CPR must be performed immediately to gain time for further rescue of the patient.

[0037] The principle of CPR is to make the heart produce airflow through external force to maintain the normal operation of the body's basic circulatory system. When performing CPR, the rescuer performs chest compression to allow the patient's heart to be subjected to sufficient pressure so that the blood in the heart is forced out. When the chest compression is released, the patient inhales fresh oxygen, and the lungs also expand with the airflow to promote oxygen inhalation. Chest compression is an operation method of compressing the heart to produce airflow by pressing the chest and heart.

[0038] However, even for professionals, the frequency and depth of chest compression are difficult to achieve the ideal compression standard of consistency and efficiency. This is because chest compression requires certain skills, and the body structure and state of each person are different, so it is difficult to operate accurately. If the compression degree is too shallow, the effective compression effect cannot be achieved, and if the compression degree is too deep, it may cause excessive collapse of the patient's chest and even cause the patient's sternum to be fractured, thereby causing secondary injury to the patient. Therefore, there is a proposal to use a mechanical assistance method to replace manual CPR, that is, to use an automatic compression device to provide relatively fixed pressure and frequency compression to the patient. Mechanical actuation is different from manual compression, which is not limited by physical strength and can provide relatively stable compression force for a long time. However, mechanical compression still has some problems, that is, the compression parameters cannot be adjusted relatively flexibly. Since the process of CPR is also not constant, there may be a situation of adjusting the compression parameters based on the different conditions (determined by physiological parameters) of the patient during the execution of CPR. How to relatively accurately adjust the mechanical compression parameters is also a problem to be solved.

[0039] In addition, how to timely determine whether the patient has restored spontaneous circulation (ROSC) and stop chest compression after the patient has restored spontaneous circulation is also one of the problems to be solved. If the patient has restored spontaneous circulation and chest compression is still performed, it will cause excessive compression of the patient's heart, reduce coronary blood flow, and cause myocardial ischemia and even necrosis; or affect the normal heart rhythm, and even cause cardiac arrest.

[0040] Based on the above, the present scheme proposes a cardiopulmonary resuscitation device, which comprises a pressing module 100 for applying actuation of prescribed working parameters to a patient to realize a life support process based on external supply, assisting the patient to recover stable function of cardiopulmonary autonomic. The pressing module 100 can be controlled by the computing module 500 to change at least one working parameter thereof. The device further comprises a chest height sensing module 200 for detecting a height signal of the patient's chest. A pulse sensing module 300 capable of detecting and transmitting the patient's pulse signal. A blood oxygen sensing module 400 capable of detecting and transmitting the patient's blood oxygen saturation signal. The computing module 500 is in communication connection with the chest height sensing module 200, the pulse sensing module 300, the blood oxygen sensing module 400 and the pressing module 100 to obtain the chest height, pulse signal and blood oxygen saturation signal, and to regulate at least one working parameter of the pressing module 100 based on computing processing.

[0041] The pressing module 100 comprises at least one pushing unit 101 capable of generating pressure actuation to the patient. Basically, the pushing unit 101 can be realized by a telescopic structure, for example, a telescopic rod, a hydraulic rod or the like structure. Preferably, the pushing unit 101 can be controllably driven to generate pressure actuation to the patient, for example, a telescopic rod that can be driven, a telescopic structure driven by a motor, etc. The pressing module 100 can further comprise a support unit for wrapping around the patient's limbs to limit the patient's body, and the support unit can also determine the position of the pushing unit 101 by limiting the patient's body. Basically, the support unit needs to meet the requirement of stable external actuation of the pushing unit 101. On the other hand, the support unit can clamp the lying patient in the support unit in a two-sided wrapping manner. And based on the standard process and specification of cardiopulmonary resuscitation, the pushing unit 101 is configured at the center part of the support unit away from the ground, so that its position can correspond to the position of the patient's chest. In the case of using the device to press the patient, the support unit is placed on both sides of the lying patient, and the support unit is operated to contact and clamp on both sides of the patient, at this time the pushing unit 101 located at the center part of the support unit away from the ground is approximately at the position corresponding to the patient's chest. By the fine adjustment structure arranged at the connection between the pushing unit 101 and the support unit, the pushing unit 101 can be accurately adjusted to the position corresponding to the patient's chest. Then, the pushing unit 101 is controlled to generate actuation action to the patient's chest, and the patient's chest continues to be driven by the pushing unit 101 to deform in the direction of concave after contacting the pushing unit 101. When the pushing unit 101 is pressed downward to the preset depth, a pressing process is completed. Then the pushing unit 101 moves upward in the opposite direction, the chest expands and recovers, and when the pushing unit 101 is at the critical position of contacting the patient's chest or leaving the chest, a relaxation process is completed.

[0042] Preferably, the pushing unit 101 is detachably arranged on the supporting unit, so that it can be detached and replaced. In some embodiments, it can be replaced by a hand-shaped element made of a skin-friendly material, so that the patient feels more comfortable and reduces the patient's fear. This solution is particularly suitable for neonatal cardiopulmonary resuscitation, which can simulate personnel pressing and reduce the fear of the device by the newborn. Preferably, the part of the pushing unit 101 that contacts the patient's body surface is provided with a heating component, so that the contact part can be heated to a temperature range suitable for the human body, so that the patient feels more comfortable.

[0043] The chest height sensing module 200 is configured to collect the height change data of the patient's chest under the actuation of the pushing unit 101. In this solution, the height of the patient's chest generally refers to the height of the position where the patient's chest contacts the pushing unit 101, and the change of the height can reflect the degree of compression of the patient's chest. According to the cardiopulmonary resuscitation guidelines, for example, the adult compression depth generally needs to be 5-6 cm, and the compression depth needs to be strictly controlled. Too shallow or too deep can cause negative effects, so the collection of chest height is necessary. In this solution, the chest height sensing module 200 can use infrared ranging, image recognition, patch sensing, etc. to collect the change information of the chest height. Another feasible way is to indirectly determine the chest height information by detecting the displacement of the pushing unit 101. For example, the initial position of the pushing unit 101 is at the critical position of contacting the patient, and then only the displacement of the pushing unit 101 needs to be measured, and then the change amount of the chest height can be known, that is, the chest collapse height can be known.

[0044] The pulse sensing module 300 is configured to collect the pulse signal of the patient. The pulse signal is a pulse signal that can be collected by the pulse sensing module 300. The pulse sensing module 300 collects the pulse signal related to the pulse and processes it into pulse data. The collected signal is output in a way related to signal frequency and time, and according to the source of the pulse signal, it can be processed into multiple signals. When external compression is applied, a first pulse signal is generated, which is formed by mechanical compression; the patient will produce weak pulse in the stage of recovering weak heartbeat, and such pulse signal is usually chaotic, with irregular frequency and non-uniform amplitude, which can be judged as the second pulse signal of arrhythmia; the third pulse signal will also appear when the patient has established basic autonomous pulse in the later stage of cardiopulmonary resuscitation, which is the regular pulse signal of the patient's autonomous pulse.

[0045] The blood oxygen sensing module 400 is configured to collect the blood oxygen information of the patient. In this solution, an existing blood oxygen sensor can be selected as the blood oxygen sensing module 400 of this solution. When using the device, the blood oxygen sensing module 400 can be worn on the patient's body, and further can be clamped on the patient's finger.

[0046] Preferably, in the use of the device, the patient is placed in the compression module 100, and the compression push rod is aligned with the chest of the patient, and the compression module 100 is configured to perform compression actions according to the control signals from the calculation module 500.

[0047] Preferably, when the compression module performs compression actions, the chest height sensing module 200 monitors the initial chest height (first chest height) of the patient before compression, and the calculation module 500 records the first chest height; after each compression action is performed, the chest height sensing module 200 transmits the real-time chest height (second chest height) of the patient to the calculation module 500; the calculation module 500 calculates the chest collapse height according to the difference between each second chest height and the first chest height. When the chest collapse height is in the first range, for example, it can be greater than 5 cm, the calculation module 500 controls the ventilation module 600 to deliver a first gas delivery amount with a larger ventilation amount to adapt to the inspiratory state of the person; when the chest collapse height is in the second range, for example, it can be around 0, the calculation module 500 controls the ventilation module 600 to deliver a second gas delivery amount with a smaller ventilation amount to adapt to the expiratory state of the person.

[0048] Preferably, the first gas delivery amount has a further setting. That is, according to different patient types, the first gas delivery amount is adjusted based on different patient blood oxygen saturation intervals. Further, a plurality of blood oxygen saturation intervals can be pre-set in the calculation module 500, or a plurality of blood oxygen saturation intervals can be set in the database. The plurality of blood oxygen saturation intervals are different according to the difference in patient type. In detail, the normal blood oxygen saturation range of adults is above 95%; the normal blood oxygen saturation range of the elderly may be slightly lower than that of adults, about 92%-95%; the normal blood oxygen saturation range of teenagers and children is similar to that of adults, also above 95%; the normal blood oxygen saturation range of newborns is usually between 93%-100%, but on the first day after birth, the normal blood oxygen saturation may be slightly lower than this range; the normal blood oxygen saturation range of infants is usually similar to that of newborns, about 95%-100%. Therefore, the calculation module 500 can determine the corresponding blood oxygen saturation interval based on the above pre-set data according to the determined different patient types currently in need of cardiopulmonary resuscitation. The calculation module 500 can obtain the patient type by inputting the identification code of the current patient in need of cardiopulmonary resuscitation by the operator. Preferably, in the emergency of cardiopulmonary resuscitation, the use of code scanning, face recognition and other ways of reducing manual operation and faster recognition speed can save rescue time and personnel effort.

[0049] Further, after determining the corresponding blood oxygen saturation interval based on the current patient type, the computing module 500 can dynamically determine the specific value of the first gas delivery amount based on the patient blood oxygen saturation signal transmitted by the blood oxygen detection module worn on the patient, under the condition of judging the relative relationship between the blood oxygen saturation signal and the corresponding blood oxygen saturation interval. Preferably, when the blood oxygen saturation signal is less than the lower limit of the corresponding blood oxygen saturation interval, the first gas delivery amount is adjusted to the first level gas delivery amount; when the blood oxygen saturation signal is higher than the lower limit of the corresponding blood oxygen saturation interval, the adjustment mode of the first gas delivery amount within the second level gas delivery amount is determined based on the prediction of the change trend of the blood oxygen saturation signal, wherein the first level gas delivery amount is greater than the second level gas delivery amount. Preferably, the first level gas delivery amount is a relatively high gas delivery amount corresponding to the case that the patient's blood oxygen saturation signal is low, at which time a higher oxygen delivery is needed to meet the patient's oxygen demand, for example, it can be 60 ml each time. The range of the second level gas delivery amount compared to the first level gas delivery amount can be larger, because in this embodiment, the second level gas delivery amount can be adjusted to a specific value within its range. For example, the second level gas delivery amount is configured to a range of 30-50 ml each time, and when the corresponding gas delivery amount is given, it can be selected within the above range. Preferably, the above selection is achieved based on the prediction of the change trend of the blood oxygen saturation signal, based on the analysis of the change trend of the blood oxygen saturation signal at the current time point or within a predetermined period of time containing the current time point, it can be known that the current blood oxygen saturation signal is in the increasing or decreasing trend. The analysis method can be to process the data into a curve, then obtain the derivative in a derivative manner, and judge the increase or decrease based on the derivative value. Further, when the current blood oxygen saturation signal is in the increasing trend, the second level gas delivery amount changes in the manner of gradually decreasing the ventilation amount within its range with the number of presses. For example, select a range of 40-30 ml each time, gradually decrease with each press, so as to decrease to 30 ml each time or a similar value; similarly, when the current blood oxygen saturation signal is in the decreasing trend, the second level gas delivery amount changes in the manner of gradually increasing the ventilation amount within its range with the number of presses. For example, select a range of 40-50 ml each time, gradually increase with each press, so as to increase to 50 ml, and when the blood oxygen saturation signal is lower than the lower limit of the above blood oxygen saturation interval, switch to the first level gas delivery amount. The above scheme realizes the dynamic adjustment of the gas amount or oxygen amount based on the blood oxygen condition of the patient with the number of presses during the cardiopulmonary resuscitation process. The present scheme notes that for patients who have fallen into cardiac or respiratory arrest, when oxygen is supplied to them, since there is a recovery process of the patient's body function in the cardiopulmonary resuscitation stage, during the recovery process, the patient can partially recover the function of inhaling oxygen autonomously.The prior art does not consider the self-recovery of the patient's partial function, and the oxygen is given to the patient in a fixed manner or the random artificial breathing oxygen amount is given when the cardiopulmonary resuscitation is performed artificially, which can cause the problems of insufficient oxygen amount provided to the patient in the early stage of cardiopulmonary resuscitation, inability to provide a continuous and relatively stable oxygen amount supply to the patient in the middle stage of cardiopulmonary resuscitation, and inability to dynamically reduce the partial additional oxygen supply based on the functional recovery of the patient in the late stage of cardiopulmonary resuscitation. The present scheme can further subdivide the cardiopulmonary resuscitation process based on the physical function recovery of the patient and automatically adjust the oxygen amount provided to the patient under the condition of saving artificial attention, so as to ensure that the patient receives the most suitable oxygen flux in the process of cardiopulmonary resuscitation.

[0050] Preferably, the chest height sensing module 200 monitors the chest height of the patient and transmits a chest height signal of the patient to the calculation module 500. The calculation module 500 compares the chest height signal of the patient with the pre-built "chest collapse degree-pressing times" relationship curve and outputs a corresponding pressing depth control signal. The pressing module 100 determines the pressing depth according to the pressing depth control signal and performs corresponding pressing action.

[0051] In the process of chest compression, the chest of the patient will gradually collapse with the increase of the pressing times. Under a certain pressing times, a certain degree of collapse is acceptable, and therefore, a plurality of "chest collapse height-pressing times" function relationship curves for different types of patients (adults, women, the elderly, children, newborns, etc.) can be made to control the chest collapse degree of the patient in the actual pressing process.

[0052] The calculated chest collapse height is compared with the preset "chest collapse height-pressing times" function relationship curve, and a corresponding pressing depth control signal is output according to the comparison result.

[0053] If the chest collapse height is greater than the expected chest collapse degree, the pressing depth of the next time is controlled to be reduced. For example, the degree of reduction of the pressing depth can be controlled according to the degree that the chest collapse height is greater than the expected chest collapse height: if the chest collapse height is 1.1 times of the expected chest collapse height, the pressing depth value controlled by the pressing depth control signal of the next time is 0.9 times of the last time.

[0054] If the chest collapse height exceeds the chest collapse warning value, it indicates that the patient's sternum is about to be fractured, which is to be avoided during chest compression, the calculation module 500 controls the compression depth value represented by the next compression depth control signal to decrease at a greater rate. If the chest collapse height is less than or equal to the expected chest collapse degree, the compression depth is not controlled, i.e. the compression depth value represented by the next compression depth control signal is equal to the last one.

[0055] According to different patient types, different compression depths and compression depth reduction degrees are set. For example, the tolerance of the elderly and women to chest compression is different.

[0056] Further, the cardiopulmonary resuscitation device further comprises an indication module 700 for visually displaying the chest height signals and the like of the patient.

[0057] The indication module 700 is also configured to receive instructions from the calculation module 500 to issue voice to the rescuer.

[0058] If the chest collapse height exceeds the chest collapse warning value, it indicates that the patient's sternum is about to be fractured, the calculation module 500 issues instructions to the indication module 700, and the indication module 700 issues an alarming voice to the rescuer, such as "Please note that the patient's chest height collapse is close to the warning value", reminding the rescuer to pay attention to the patient's condition and avoid secondary injury such as sternum fracture.

[0059] Preferably, the pulse sensing module 300 monitors the patient's pulse signal in real time and transmits the original pulse signal to the calculation module 500, and the calculation module 500 analyzes the original pulse signal and decomposes the original pulse signal into three kinds of pulse signals: the first pulse signal representing the compression of the device, the second pulse signal representing the patient's self-generated arrhythmic pulse, and the third pulse signal representing the patient's self-generated stable pulse.

[0060] The calculation module 500 compares the first, second and third pulse signals with preset pulse characteristic functions, and determines the pulse state of the patient according to the comparison result. For example, only the first pulse signal represents that the received pulse signal is completely generated by the device compression, and the patient does not have self-generated pulse; if there are both the first and second pulse signals, it indicates that the patient has generated a certain self-generated pulse, but the pulse is still irregular; if there are both the first and third pulse signals, it indicates that the patient has generated a self-generated and stable pulse.

[0061] When the time at which the third pulse signal is generated reaches the preset autonomous pulse duration, the calculation module 500 determines whether the patient has recovered autonomous circulation according to the blood oxygen saturation of the patient, and stops the chest compression when the patient has recovered autonomous circulation.

[0062] If the blood oxygen saturation of the patient falls into the preset blood oxygen saturation interval, it indicates that the patient not only generates an autonomous and stable pulse, but also that the pulse restores the blood oxygen saturation to normal, and is regarded as the patient having recovered autonomous circulation (ROSC), and the calculation unit issues a stop instruction to the compression element.

[0063] It is worth noting that while the computing element determines whether the patient's blood oxygen saturation falls into the preset blood oxygen saturation interval, the third pulse signal must also be in a stable generation phase, otherwise it cannot be explained that the patient's blood oxygen saturation recovery is caused by the patient's autonomous stable pulse, but it is also possible to be caused by the pulse generated by the device compression. It is not accurate to consider that the patient has recovered autonomous circulation only by the blood oxygen saturation falling into the preset blood oxygen saturation interval, which may cause misjudgment, so that chest compression is stopped when the patient has not yet recovered autonomous circulation, which does not achieve the effect of cardiopulmonary resuscitation, and even causes rescue failure. Preferably, an optimal implementation is also proposed, in which the compression module 100 is configured to perform the compression down and lift actions at a first frequency during the automatic cardiopulmonary resuscitation of the patient, and the ventilation module 600 is configured to provide oxygen with alternating concentration parameters to the patient at a second frequency, wherein the first frequency and the second frequency have a time difference at the respective execution nodes, and the time difference is adjusted based on at least one detected physiological parameter of the patient. Preferably, the physiological parameter is selected as the pulse signal of the patient. The execution node refers to the time point at which the compression module 100 or the ventilation module 600 respectively performs an action at its own set frequency, for example, for the compression module 100, it refers to the time point at which the down action or the lift action is performed; for the ventilation module 600, it refers to the time point at which one concentration parameter is delivered. The alternating concentration parameter refers to the ventilation module 600 being able to deliver oxygen with switched concentration to the patient. The essence of cardiopulmonary resuscitation is to artificially apply external force to simulate the pumping function of the human heart and lungs, so that artificial circulation is realized in the patient's body for a period of time, basic blood supply to important organs such as heart and brain is met, and the patient recovers autonomic circulation. However, the process also needs to simulate the human respiratory process, which is divided into two stages, inhalation and exhalation, and the chest shape is different in different stages, and the external compression stage is also different. Based on simulating human respiration, the two stages have different recommended oxygen concentrations. Generally speaking, the oxygen concentration during the simulated inhalation process is higher. Therefore, in this embodiment, a ventilation module 600 with at least two switchable concentrations is selected to provide different concentrations of oxygen to the patient at a second frequency to adapt to the two stages of the patient's breathing, so that the patient can recover autonomic circulation as soon as possible in a better environment. However, the scheme finds that there is a certain time difference between the deformation process of external compression to simulate the deformation of the chest and the actual breathing cycle of the human body, which is mainly due to the high-level absorption stage of the oxygenation process affected by the transformation mechanism of the heart and lung function. There is a lag, and the difference is related to the degree of autonomic recovery of the patient during cardiopulmonary resuscitation. Under the condition that the patient gradually recovers the heart and lung function and gradually establishes autonomic circulation, the heart and lung can participate more quickly in the oxygen conversion process, so that the time difference is appropriately shortened to meet the patient's rapid and sufficient oxygen demand.Conversely, when the patient's heart and lung function is developing towards a state of arrest, it is also necessary to appropriately extend the time difference to ensure that the lungs in the corresponding state can absorb sufficient oxygen under the condition of external auxiliary simulation breathing. In the present embodiment, the patient's pulse parameter is selected as the reference parameter for determining the time difference. One possible way is to establish the relationship between the patient's pulse and the time difference in advance, which can be a table. More preferably, different relationships can be determined for different types of patients. The pulse parameter of the patient is selected because the pulse can reflect the degree of the patient's own participation in the respiratory process. The patient's heart and lung participate in the respiratory process, which produces certain physiological feedback on the pulse. By detecting the pulse frequency, the patient's own heart and lung function recovery can be known, so that the setting value of the time difference can be adjusted in time. On the other hand, the pulse parameter can exclude the similar heart beat parameters caused by external compression, so as to ensure that the processing data is not disturbed, and the time difference can be accurately adjusted. Based on the above, the pulse detection can detect multiple wave data at the same time, one of which is the pulse wave caused by external compression, and one of which is the pulse wave generated by the patient's own recovery of autonomous circulation. The pulse wave caused by external compression can be quickly excluded by the calculation module 500 by comparing with the first frequency set by the compression module 100 (because the pulse wave data generated by the compression module 100 set by the first frequency has a strong correlation with the first frequency, so it can be quickly distinguished from the waveform), and the remaining pulse wave data can be more quickly integrated and analyzed to form data that can accurately reflect the patient's autonomous circulation. The present scheme can quickly exclude irrelevant pulse wave data, and can quickly distinguish the pulse wave signal of the patient's autonomous circulation, so as to further accurately determine the setting value of the time difference according to the pulse wave signal of the patient's autonomous circulation.

[0064] Preferably, a cardiopulmonary resuscitation method is also provided, which is configured with a compression module 100 capable of performing automatic compression action on the patient, and the compression action can be controlled and adjusted. It is also configured with a ventilation module 600 capable of ventilating the patient, and the ventilation can be controlled and adjusted. The method comprises the following contents: monitoring the patient's chest height signal; monitoring the patient's original pulse signal; monitoring the patient's blood oxygen saturation signal; when the patient is placed under the compression module 100 to receive cardiopulmonary resuscitation, adjusting at least one working parameter of the compression module 100 and / or the ventilation module 600 in a manner associated with the patient's chest height signal, original pulse signal and blood oxygen saturation signal. The method is mostly the same as the above-mentioned device, additionally, the subject performing the related functions in the method can be various types of equipment or personnel, which is not limited in the present embodiment.

[0065] It should be noted that the above-mentioned embodiments are only examples, and those skilled in the art can think of various solutions under the inspiration of the disclosure of the present application, and these solutions also belong to the disclosed range of the present application and fall within the protection scope of the present application. Those skilled in the art should understand that the specification and drawings of the present application are illustrative and not limiting to the claims. The protection scope of the present application is defined by the claims and their equivalents. The specification of the present application contains multiple inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", which all indicate that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application according to each inventive concept. Throughout the text, the features introduced by "preferably" are only optional ways, and should not be understood as necessarily provided, therefore the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A cardiopulmonary resuscitation device, The system comprises, a compression module (100) configured to compress the chest of a patient, and arranged to perform compression actions according to control signals from a calculation module (500); a chest height sensing module (200) configured to monitor and transmit a chest height signal of the patient; a pulse sensing module (300) configured to monitor and transmit a raw pulse signal of the patient; an oxygen saturation sensing module (400) configured to monitor and transmit an oxygen saturation signal of the patient; a ventilation module (600) configured to deliver breathing gas to the airway of the patient; characterized in that the calculation module (500) receives the chest height signal, the raw pulse signal and the oxygen saturation signal, and adjusts at least one working parameter of the compression module (100) and / or the ventilation module (600) in a manner associated with the chest height signal, the raw pulse signal and the oxygen saturation signal when the patient is placed under the compression module (100) to receive cardiopulmonary resuscitation; in the case that the chest height sensing module (200) detects two chest heights of the patient when the compression module (100) is pressed down and lifted up, and transmits to the calculation module (500), the calculation module (500) can determine a chest collapse height based on the difference between the two chest heights, and then, when the chest collapse height is in a first range, the calculation module (500) controls the ventilation module (600) to deliver oxygen to the patient at a first gas delivery amount; when the chest collapse height is in a second range, the calculation module (500) controls the ventilation module (600) to deliver oxygen to the patient at a second gas delivery amount, wherein the first range has a larger value than the second range, and the second gas delivery amount has a smaller value than the first gas delivery amount.

2. The apparatus of claim 1, wherein, The calculation module (500) can adjust the value of the first gas delivery amount given by the ventilation module (600) when it determines the position of the oxygen saturation signal of the patient in its corresponding oxygen saturation interval, wherein when the oxygen saturation signal is lower than the lower limit of the oxygen saturation interval, the first gas delivery amount is configured as a first level gas delivery amount, and when the oxygen saturation signal is higher than the lower limit of the oxygen saturation interval, the first gas delivery amount is configured as a second level gas delivery amount, the first level gas delivery amount being greater than the second level gas delivery amount.

3. The apparatus of claim 2, wherein, When the oxygen saturation signal is higher than the lower limit of the corresponding oxygen saturation interval, the calculation module (500) determines the adjustment manner of the first gas delivery amount within the second level gas delivery amount based on the prediction of the trend of the change of the oxygen saturation.

4. The apparatus of claim 3, wherein, In the case that the current oxygen saturation signal changes in the direction of increasing, the first gas delivery amount changes in the manner of gradually decreasing the ventilation amount within the second level gas delivery amount with the number of compressions.

5. The apparatus of claim 4, wherein, In the current blood oxygen saturation signal changes in the direction of reducing the trend, the first gas delivery amount in the second level gas delivery amount in the manner of increasing ventilation with the number of compression, and in the blood oxygen saturation signal is lower than the lower limit of the above blood oxygen saturation interval, the first gas delivery amount is switched to the first level gas delivery amount.

6. The apparatus of claim 5, wherein, The calculation module (500) compares the patient chest height signal with a preset "chest collapse degree-compression number" relationship curve, and outputs a compression depth control signal. The compression module (100) determines the compression depth according to the compression depth control signal and performs corresponding compression action.

7. The apparatus of claim 6, wherein, In the case where the chest collapse height is greater than the expected chest collapse degree obtained based on the relationship curve, the calculation module (500) outputs a compression depth control signal to control the compression module (100) to reduce the compression depth.

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