A ventilation device for animals and its alarm method

Abstract

The present invention discloses a ventilation device for a target object and an alarm method thereof. The target object includes small animals. The alarm method includes: obtaining at least two types of parameter data that can characterize the occurrence of an alarm event during the ventilation process of the target object. The parameter data is ventilation parameter data or physiological parameter data of the target object, and each type of parameter data is used to identify whether at least one type of alarm event has occurred; according to the recognition results of whether the same type of alarm event has occurred based on at least two types of parameter data, comprehensively judge whether each type of alarm event has occurred, and output corresponding alarm information when an alarm event occurs. Applying this alarm method to the ventilation device can effectively reduce false alarms during the ventilation process of the target object.

Description

Technical Field

[0001] The present invention relates to the field of medical technology, and particularly to a ventilation device and an alarm method for the ventilation device, and more particularly to a ventilation device for animals and an alarm method therefor. Background Art

[0002] When a ventilation device is used to ventilate a patient clinically, if an alarm event occurs (for example, the patient suffocates), the ventilation device will issue a corresponding alarm. Whether the target of ventilation is human or animal, when surgery is required due to illness or other reasons, an external ventilation device needs to be used to undertake ventilation or provide respiratory support. When traditional ventilation devices (such as human anesthesia machines, human ventilators, veterinary anesthesia machines or veterinary ventilators) are used for ventilation, they collect the airway flow rate and pressure signals during the breathing of the target object, and issue an alarm according to whether these two signals are abnormal. For some target objects (such as small animals), due to their small size and relatively weak breathing, it is easy to generate various false alarms only relying on the airway flow rate or airway pressure signal. The generation of false alarms will, on the one hand, increase the psychological pressure of users at work, and on the other hand, for veterinary ventilation devices, some alarms are voice alarms or light alarms, which are likely to make small animals more defensive and less compliant. Summary of the Invention

[0003] According to a first aspect, an embodiment provides a ventilation device, comprising:

[0004] A gas source interface connected to a gas source;

[0005] A breathing circuit that connects the gas source interface and the respiratory system of the target object to deliver the gas provided by the gas source to the target object;

[0006] An anesthetic output device for mixing the stored anesthetic with the input gas and then outputting it into the breathing circuit;

[0007] A breathing assistance device that provides ventilation support to the target object through the breathing circuit, and controls the delivery of the gas provided by the gas source and the gas mixed with the anesthetic output by the anesthetic output device to the target object;

[0008] A processor is configured to obtain at least two types of parameter data that can characterize the occurrence of an alarm event during ventilation of the target object, and identify the occurrence of the alarm event based on the obtained parameter data; wherein, all of the parameter data are ventilation parameter data, or all of the parameter data are physiological parameter data of the target object, or the parameter data include both ventilation parameter data and physiological parameter data of the target object; each type of parameter data is used to identify whether at least one type of alarm event occurs; and based on the identification results of whether the same type of alarm event occurs according to at least two types of parameter data, comprehensively determine whether each type of alarm event occurs, and output corresponding alarm information when an alarm event occurs.

[0009] According to a second aspect, an embodiment provides an alarm method for a ventilation device, including:

[0010] Obtain at least two types of parameter data that can characterize the occurrence of an alarm event during ventilation of the target object, where the parameter data are ventilation parameter data or physiological parameter data of the target object, and each type of parameter data is used to identify whether at least one type of alarm event occurs;

[0011] Based on the identification results of whether the same type of alarm event occurs according to at least two types of parameter data, comprehensively determine whether each type of alarm event occurs, and output corresponding alarm information when an alarm event occurs.

[0012] In the above embodiment, by comprehensively determining the alarm event occurred by the target object according to different parameter data, the judgment accuracy of the alarm event is improved, and the false alarm generated when only using a single parameter for judgment is reduced. Description of the Drawings

[0013] Figure 1 It is a schematic diagram of a ventilation device in an embodiment when the target object is inhaling;

[0014] Figure 2 It is a schematic diagram of a ventilation device in an embodiment when the target object is exhaling;

[0015] Figure 3 It is a waveform diagram of carbon dioxide concentration in an embodiment;

[0016] Figure 4 It is a waveform diagram of airway flow rate in an embodiment;

[0017] Figure 5 It is a flowchart of an alarm method for a ventilation device in an embodiment;

[0018] Figure 6 It is a flowchart of identifying an asphyxia alarm event according to carbon dioxide concentration in an embodiment;

[0019] Figure 7 Flow chart for identifying asphyxia alarm events based on carbon dioxide concentration for another embodiment;

[0020] Figure 8 Flow chart for identifying asphyxia alarm events based on airway flow rate for one embodiment;

[0021] Figure 9 Flow chart for identifying asphyxia alarm events based on airway flow rate for another embodiment;

[0022] 10. Anesthetic output device;

[0023] 20. Gas source interface;

[0024] 30. Respiratory interface;

[0025] 40. Respiratory circuit;

[0026] 41a. Inspiratory passage; 41b. Expiratory passage; 42. Branch;

[0027] 42a. Inspiratory valve; 42b. Expiratory valve; 42c. Respiratory valve;

[0028] 43. CO2 absorber;

[0029] 50. Respiratory assistance device;

[0030] 51a. Machine-controlled ventilation module; 51b. Manual ventilation module; 52. Three-way regulating valve;

[0031] 60. Sensor;

[0032] 70. Memory;

[0033] 80. Processor.

[0034] 100. First baseline;

[0035] 200. Second baseline;

[0036] 300. Third baseline;

[0037] 400. Fourth baseline. Detailed implementation manner

[0038] The present invention will be further described in detail below in conjunction with the specific embodiments and the accompanying drawings. Similar elements in different embodiments are denoted by related similar element numbers. In the following embodiments, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification in order to avoid overwhelming the core part of the present application with excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the descriptions in the specification and the general technical knowledge in the art.

[0039] In addition, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can also be reordered or adjusted in a manner obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for clearly describing a certain embodiment and do not mean a necessary sequence, unless it is stated otherwise that a certain sequence must be followed.

[0040] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The terms "connection" and "coupling" used in the present application, unless otherwise specified, both include direct and indirect connection (coupling).

[0041] The present invention identifies the occurrence of various alarm events through multi-parameter fusion judgment, thereby being able to more accurately identify alarm information. The present invention is particularly applicable to the scenario of ventilating a small-volume ventilation target object, such as the scenario of ventilating small animals, such as cats, dogs, rabbits, mice and other animals.

[0042] Please refer to Figure 1 and Figure 2 the illustrated embodiment. In this embodiment, an anesthesia machine is used as the ventilation device. This type of anesthesia machine includes both anesthesia machines for humans and anesthesia machines for small animals. In the following description, the case where the anesthesia machine is used for ventilating small animals is taken as an example for illustration, but it should be understood that the same ventilation device and its alarm method can also be applicable to ventilating human patients. The anesthesia machine of this embodiment includes a gas source (not shown), an anesthetic output device 10, a gas source interface 20, a breathing interface 30, a breathing circuit 40, a breathing assistance device 50, a sensor 60, a memory 70, and a processor 80.

[0043] The gas source is used to supply gas. The gas can generally be oxygen, nitrous oxide (laughing gas), air, etc. In some embodiments, the gas source is supplied by a compressed gas cylinder (or a central gas supply source), and the supplied gases include oxygen O2, nitrous oxide N2O, air, etc.

[0044] The anesthetic used in the anesthetic machine is usually in liquid form. In this embodiment, the anesthetic vaporizer serves as the anesthetic output device 10, which is used to convert the stored anesthetic into anesthetic vapor and mix it with the gas input from the gas source and then input it into the breathing circuit 40. In some embodiments, it can be combined with a microcomputer and sensors to form an electronically controlled vaporizer, enabling automatic control of the anesthetic concentration, reducing the possibility of human error, and improving the safety of inhaled anesthesia.

[0045] The breathing circuit 40 includes an inhalation passage 41a and an exhalation passage 41b. An air inlet for introducing anesthetic gas is provided on the inhalation passage 41a. The gas source and the anesthetic output device 10 are respectively connected to the air inlet of the inhalation passage 41a. The inhalation passage 41a and the exhalation passage 41b are respectively connected to the respiratory system of a small animal. The inhalation passage 41a is responsible for delivering the anesthetic mixture gas to the small animal, and the exhalation passage 41b is used to recover the gas exhaled by the small animal and discharge the excess anesthetic gas into the residual gas collection system. In this embodiment, the inhalation passage 41a is connected between the breathing interface 30 and the breathing assistance device 50. Depending on the situation, the breathing interface 30 can be a tracheal intubation or a face mask for wearing over the mouth and nose. The exhalation passage 41b is connected to the breathing interface 30 and closed into the inhalation passage 41a, so that the gas exhaled by the small animal can be re-sent into the inhalation passage 41a. A CO2 absorber 43 is also provided on the inhalation passage 41a. The CO2 absorber 43 is located between the breathing assistance device 50 and the inhalation valve 42a, and its function is to filter the CO2 in the gas entering the inhalation passage 41a from the exhalation passage 41b. In some embodiments, the exhalation passage 41b can also be connected between the breathing interface 30 and the breathing assistance device 50.

[0046] A valve for controlling the gas flow direction is provided within the breathing circuit 40. In some embodiments, the valve may include an inhalation valve 42a and an exhalation valve 42b. The inhalation valve 42a is provided on the inhalation passage 41a, and the exhalation valve 42b is provided on the exhalation passage 41b. The inhalation valve 42a and the exhalation valve 42b are respectively one-way valves. The opening direction of the inhalation valve 42a faces the small animal, and the opening direction of the exhalation valve 42b faces away from the small animal. In this way, when the small animal inhales, the inhalation valve 42a opens and the exhalation valve 42b closes; when the small animal exhales, the exhalation valve 42b opens and the inhalation valve 42a closes. In some embodiments, the inhalation valve 42a and the exhalation valve 42b can also be general control valves, and the corresponding control valves are controlled by the processor 80 to open or close. For example, in the inhalation stage, the processor 80 can control the inhalation valve 42a on the inhalation passage 41a to open and close the exhalation valve 42b on the exhalation passage 41b, so that the small animal can inhale gas smoothly; in the exhalation stage, the processor 80 can control the exhalation valve 42b on the exhalation passage 41b to open and close the inhalation valve 42a on the inhalation passage 41a, so that the small animal can exhale gas smoothly.

[0047] The breathing assistance device 50 is used to assist and control the breathing of small animals. It includes a machine-controlled ventilation module 51a and a manual ventilation module 51b. The ventilation mode can be switched through a machine-controlled or manual switch (such as a three-way regulating valve 52), so that the anesthesia machine can provide a machine-controlled ventilation mode and a manual ventilation mode for small animals. In this embodiment, the manual ventilation module 51b includes an airbag. When ventilating in the manual ventilation mode, the breathing circuit 40 is connected to the airbag by switching the three-way regulating valve 52. Medical staff such as anesthesiologists or surgeons control the breathing of small animals by manually pressing the airbag. When ventilating with the machine-controlled ventilation module 51a, the machine-controlled ventilation module 51a is connected to the breathing circuit 40 by switching the three-way regulating valve 52, and machine ventilation is used to replace manually pressing the airbag, so as to provide ventilation support for small animals. A branch 42 is provided on the pipeline where the airbag is connected to the inhalation passage 41a. A breathing valve 42c is provided at the exhaust port at the end of the branch 42, which is used to ensure the pressure stability within the breathing circuit 40 in the manual ventilation mode. In the manual ventilation mode, if the pressure within the breathing circuit 40 is too high, the pressure within the branch 42 will also be too high, then the breathing valve 42c will automatically open, and a part of the gas within the breathing circuit 40 will be discharged through the breathing valve 42c, thereby reducing the pressure within the breathing circuit 40 and avoiding lung damage to small animals caused by excessive pressure within the breathing circuit 40 when manually pressing the airbag.

[0048] When the manual airbag is connected to the breathing circuit 40 by switching the state of the three-way regulating valve 52, when it is necessary to assist the small animal to inhale, such as Figure 1As shown, the airbag can be squeezed by hand or other tools, and the gas in the airbag is squeezed through and enters the breathing circuit 40 through the three-way regulating valve 52. At this time, the inhalation valve 42a is in an open state under the action of the air flow, and the exhalation valve 42b is in a closed state under the action of the air flow. Therefore, the air flow reaches the inhalation valve 42a through the CO2 absorber 43. The carbon dioxide in the air flow is filtered in the CO2 absorber. The gas with filtered CO2 is mixed with the anesthetic mixture gas output by the anesthetic output device 10 and then flows into the inhalation passage 41a through the inhalation valve 42a, and then enters the respiratory system of the small animal through the breathing interface 30. Figure 1 The arrow in [it] indicates the direction of the air flow during the inhalation phase. When it is necessary to assist the small animal to exhale, such as Figure 2 As shown, release the airbag. The airbag returns to its original shape due to elasticity, and the pressure in it decreases. The air flow in the breathing circuit 40 flows back into the airbag. In this case, the inhalation valve 42a is closed and the exhalation valve 42b is opened. The air flow in the respiratory tract of the small animal flows back into the airbag through the exhalation valve 42b. Figure 2 The arrow in [it] indicates the direction of the air flow during the exhalation phase.

[0049] The sensor 60 is used to collect and output at least two parameter data that can characterize the occurrence of an alarm event during the ventilation of the small animal. The above parameter data can be the ventilation parameter data of the anesthesia machine or the physiological parameter data of the small animal. For example, if two parameter data are detected, these two parameter data can both be ventilation parameter data, or both be physiological parameter data, or one be ventilation parameter data and the other be physiological parameter data. Among them, the ventilation parameter data of the anesthesia machine can include but are not limited to airway pressure and airway flow rate, and the physiological parameter data of the small animal can include but are not limited to carbon dioxide concentration and blood oxygen saturation. To collect the parameter data, the sensor 60 can be placed inside or on the surface of the small animal, or can be set in the breathing circuit 40. In other embodiments, the ventilation device can also obtain the parameter data through a third-party device, such as obtaining the required parameter data through a veterinary monitor.

[0050] The memory 70 is used to store data or programs. For example, the memory 70 can store the physiological parameter data of the animal, or the ventilation parameter data during the ventilation of the animal, or the memory 70 can store the graphical user interface, one or more default parameter display settings, and programming instructions for the processor 80. The memory 70 can be a tangible and non-transitory computer-readable medium, such as flash memory, RAM, ROM, EEPROM, etc.

[0051] The processor 80 is used to execute programs and process the data in the memory 70 or the data output by the sensor 60. In this embodiment, after the processor 80 obtains at least two types of parameter data, it identifies the occurrence of an alarm event according to the obtained parameter data. The types of parameter data have been described above and will not be elaborated here. Each type of parameter data is used to identify whether at least one type of alarm event occurs. For example, the processor 80 can determine whether an alarm event such as an asphyxia alarm event occurs according to the carbon dioxide concentration of a small animal, or can also determine whether an alarm event such as an asphyxia alarm event occurs according to the airway flow rate of an anesthesia machine. Then, the processor 80 determines whether the alarm event of this type occurs according to the recognition results of at least two types of parameter data on whether the alarm event of the same type occurs. For whether each type of alarm event occurs, at least two parameters can be used for judgment, and finally it can be determined which types of alarm events occur during the ventilation of small animals.

[0052] By comprehensively identifying the occurrence of an alarm event of a certain type using at least two types of parameter data, the accuracy of identifying alarm events can be improved, and false alarms generated when only using a single parameter for judgment can be reduced.

[0053] In some embodiments, the alarm events of the same type that can be identified by the above at least two types of parameter data include asphyxia alarm events, and the parameter data that can identify asphyxia alarm events includes both ventilation parameter data and physiological parameter data of small animals. That is to say, it is comprehensively judged whether an asphyxia alarm event occurs according to the ventilation parameter data and the physiological parameter data of small animals.

[0054] In some embodiments, the physiological parameter data of small animals that can identify whether an asphyxia alarm event occurs includes carbon dioxide concentration. The methods for identifying whether an asphyxia alarm event occurs according to the carbon dioxide concentration can at least include the following two:

[0055] One method is to first obtain the maximum value and the minimum value of the carbon dioxide concentration within a preset first time threshold. The first time threshold can be a time length obtained based on experience and sufficient to judge whether an asphyxia alarm event occurs. The maximum value and the minimum value of the carbon dioxide concentration within this time length are valid and can be used to identify the asphyxia alarm event. Then calculate the difference between the maximum value and the minimum value of the carbon dioxide concentration within the first time threshold, and then judge whether the difference is greater than the first trigger threshold. If it is greater than the first trigger threshold, the asphyxia alarm event does not occur. If it is not greater than the first trigger threshold, the asphyxia alarm event occurs.

[0056] Another method is to obtain the first duration during which the carbon dioxide concentration exceeds the first reference value and the second duration during which it is lower than the second reference value within a preset second time threshold. The first reference value is greater than the second reference value.Figure 3 Among them, the dotted line corresponding to the first reference value is the first baseline 100, and the dotted line corresponding to the second reference value is the second baseline 200. Among them, the first duration is used to represent the exhalation time of the small animal, and the second duration is used to represent the inhalation time of the small animal. The second time threshold can be a time length obtained based on experience and sufficient to judge whether an asphyxia alarm event occurs. Within this time length, the first duration and the second duration are valid. The purpose of setting the first reference value and the second reference value is to filter out interference. Since the respiration of the small animal is weak, when the carbon dioxide concentration is between the first reference value and the second reference value, in order to reduce false positives, this time period is not regarded as the inhalation time or respiration time of the small animal. Then calculate the sum of the first duration and the second duration, and judge whether the sum of the first duration and the second duration is greater than the first asphyxia time threshold. If it is not greater than the first asphyxia time threshold, the asphyxia alarm event has not occurred. If it is greater than the first asphyxia time threshold, the asphyxia alarm event has occurred.

[0057] In some other embodiments, the ventilation parameter data capable of identifying whether an asphyxia alarm event occurs includes airway flow rate. The methods for identifying whether an asphyxia alarm event occurs based on the airway flow rate can at least include the following two:

[0058] One method is to obtain the maximum value and the minimum value of the airway flow rate within a preset third time threshold. Among them, the third time threshold can be a time length obtained based on experience and sufficient to judge whether an asphyxia alarm event occurs. Within this time length, the maximum value and the minimum value of the airway flow rate are valid and can be used to identify an asphyxia alarm event. Then calculate the difference between the maximum value and the minimum value of the airway flow rate within the third time threshold, and then judge whether the difference is greater than the second trigger threshold. If it is greater than the second trigger threshold, the asphyxia alarm event has not occurred. If it is not greater than the second trigger threshold, the asphyxia alarm event has occurred.

[0059] Another method is to obtain the third duration during which the airway flow rate exceeds the third reference value and the fourth duration during which the airway flow rate is lower than the fourth reference value within a preset fourth time threshold. The third reference value is greater than the fourth reference value. Figure 4Among them, the dotted line corresponding to the third reference value is the third baseline 300, and the dotted line corresponding to the fourth reference value is the fourth baseline 400. Both the third baseline 300 and the fourth baseline 400 are close to the horizontal coordinate axis. Among them, the third duration is used to represent the inhalation time of the small animal, and the fourth duration is used to represent the exhalation time of the small animal. The fourth time threshold can be the time length obtained based on experience and sufficient to judge whether an asphyxia alarm event occurs. Within this time length, the third duration and the fourth duration are valid. The purpose of setting the third reference value and the fourth reference value is to filter out interference. Since the respiration of the small animal is weak, when the airway flow rate is between the third reference value and the fourth reference value, in order to reduce misjudgment, this time period is not regarded as the inhalation time or the respiration time of the small animal. Then, calculate the sum of the third duration and the fourth duration, and then judge whether the sum of the third duration and the fourth duration is greater than the second asphyxia time threshold. If it is not greater than the second asphyxia time threshold, the asphyxia alarm event has not occurred. If it is greater than the second asphyxia time threshold, the asphyxia alarm event has occurred.

[0060] There are many ways to comprehensively identify the occurrence of a certain type of alarm event based on at least two types of parameter data. In some embodiments, for a certain type of alarm event, if the occurrence of this type of alarm event is identified based on at least two types of parameter data, then the small animal has this type of alarm event. For example, for an asphyxia alarm event, if the recognition result based on the carbon dioxide concentration is that the asphyxia alarm event has occurred, and the recognition result based on the airway flow rate is that the asphyxia alarm event has not occurred, then the final judgment result of the processor 80 is that the asphyxia alarm event has not occurred. In other embodiments, it is also possible to comprehensively judge whether a certain type of alarm event occurs according to the quantity or proportion of the parameter data for which the occurrence of a certain type of alarm event is recognized. For example, among the parameter data obtained by the processor 80, if the recognition results corresponding to more than half of the parameter data are that this type of alarm event has occurred, then the final judgment result of the processor 80 is that this type of alarm event has occurred.

[0061] For the occurred alarm event, the processor 80 also outputs corresponding alarm information to remind the user. For example, when an asphyxia alarm event occurs, the processor 80 outputs a text alarm message to be displayed on a display connected to the processor 80, and synchronously outputs abnormal parameter data to prompt the user.

[0062] The present invention also provides an alarm method for a ventilation device for small animals, as Figure 5 shown, including the steps:

[0063] Step 1000: Obtain at least two types of parameter data that can characterize the occurrence of an alarm event during the ventilation of a small animal. Each type of parameter data is used to identify whether at least one type of alarm event has occurred. The parameter data can be the ventilation parameter data of an anesthesia machine or the physiological parameter data of a small animal. For example, two types of parameter data are obtained. These two types of parameter data can both be ventilation parameter data, both be physiological parameter data, or one be ventilation parameter data and the other be physiological parameter data. Among them, the ventilation parameter data of the anesthesia machine can include, but is not limited to, airway pressure and airway flow rate, and the physiological parameter data of a small animal can include, but is not limited to, carbon dioxide concentration and blood oxygen saturation.

[0064] Step 2000: Based on the recognition results of whether the same type of alarm event has occurred according to at least two types of parameter data, comprehensively judge whether each type of alarm event has occurred.

[0065] For whether each type of alarm event has occurred, at least two parameters can be used for judgment. Finally, it can be determined which types of alarm events have occurred during the ventilation of the small animal.

[0066] By comprehensively identifying the occurrence of a certain type of alarm event using at least two types of parameter data, the accuracy of identifying alarm events can be improved, and false alarms generated when using only a single parameter for judgment can be reduced.

[0067] In some embodiments, the same type of alarm event that can be identified by the above at least two types of parameter data includes an asphyxia alarm event, and the parameter data that can identify the asphyxia alarm event includes both ventilation parameter data and the physiological parameter data of a small animal. That is to say, it is comprehensively judged whether the asphyxia alarm event has occurred according to the ventilation parameter data and the physiological parameter data of the small animal.

[0068] In some embodiments, the physiological parameter data of a small animal that can identify whether the asphyxia alarm event has occurred includes carbon dioxide concentration. The methods for identifying whether the asphyxia alarm event has occurred based on the carbon dioxide concentration can at least include the following two:

[0069] As Figure 6 shown, the method for identifying whether the asphyxia alarm event has occurred based on the carbon dioxide concentration includes the steps of:

[0070] Step 2100: Obtain the maximum and minimum values of the carbon dioxide concentration within a preset first time threshold. Among them, the first time threshold can be a time length obtained based on experience and sufficient to judge whether the asphyxia alarm event has occurred. The maximum and minimum values of the carbon dioxide concentration within this time length are valid and can be used to identify the asphyxia alarm event.

[0071] Step 2110, calculate the difference between the maximum value and the minimum value of the carbon dioxide concentration within the first time threshold.

[0072] Step 2120, determine whether the difference is greater than the first trigger threshold. If it is greater than the first trigger threshold, execute Step 2140. If it is not greater than the first trigger threshold, execute Step 2130.

[0073] Step 2130, obtain the recognition result of the occurrence of the asphyxiation alarm event.

[0074] Step 2140, obtain the recognition result of the non-occurrence of the asphyxiation alarm event.

[0075] As Figure 7 shown, identifying whether the asphyxiation alarm event occurs based on the carbon dioxide concentration includes the steps:

[0076] Step 2200, within the preset second time threshold, obtain the first duration during which the carbon dioxide concentration exceeds the first reference value and the second duration during which the carbon dioxide concentration is lower than the second reference value. The first reference value is greater than the second reference value.

[0077] Figure 3 In, the dotted line corresponding to the first reference value is the first baseline 100, and the dotted line corresponding to the second reference value is the second baseline 200. Among them, the first duration is used to represent the exhalation time of small animals, and the second duration is used to represent the inhalation time of small animals. The second time threshold can be a time length obtained based on experience and sufficient to judge whether the asphyxiation alarm event occurs. Within this time length, the first duration and the second duration are valid. The purpose of setting the first reference value and the second reference value is to filter out interference. Since the breathing of small animals is weak, when the carbon dioxide concentration is between the first reference value and the second reference value, in order to reduce misjudgment, this time period is not regarded as the inhalation time or breathing time of small animals.

[0078] Step 2210, calculate the sum of the first duration and the second duration.

[0079] Step 2220, determine whether the sum of the first duration and the second duration is greater than the first asphyxiation time threshold. If it is greater than the first asphyxiation time threshold, execute Step 2230. If it is not greater than the first asphyxiation time threshold, execute Step 2240.

[0080] Step 2230, obtain the recognition result of the occurrence of the asphyxiation alarm event.

[0081] Step 2240, obtain the recognition result of the non-occurrence of the asphyxiation alarm event.

[0082] In some embodiments, the ventilation parameter data capable of identifying whether an asphyxia alarm event occurs includes airway flow rate. The methods for identifying whether an asphyxia alarm event occurs based on the airway flow rate may include at least the following two methods:

[0083] As Figure 8 shown, identifying whether an asphyxia alarm event occurs based on the airway flow rate includes the steps of:

[0084] Step 2300, obtaining the maximum value and the minimum value of the airway flow rate within a preset third time threshold. The third time threshold may be a time length obtained based on experience and sufficient to determine whether an asphyxia alarm event occurs. The maximum value and the minimum value of the airway flow rate within this time length are valid and can be used to identify an asphyxia alarm event.

[0085] Step 2310, calculating the difference between the maximum value and the minimum value of the airway flow rate within the third time threshold.

[0086] Step 2320, determining whether the difference is greater than a second trigger threshold. If it is greater than the second trigger threshold, execute Step 2340. If it is not greater than the second trigger threshold, execute Step 2330.

[0087] Step 2330, obtaining the recognition result that an asphyxia alarm event has occurred.

[0088] Step 2340, obtaining the recognition result that an asphyxia alarm event has not occurred.

[0089] As Figure 9 shown, identifying whether an asphyxia alarm event occurs based on the airway flow rate includes the steps of:

[0090] Step 2400, within a preset fourth time threshold, obtaining the third duration during which the airway flow rate exceeds a third reference value and the fourth duration during which the airway flow rate is lower than a fourth reference value, where the third reference value is greater than the fourth reference value.

[0091] Figure 4 In, the dotted line corresponding to the third reference value is the third baseline 300, and the dotted line corresponding to the fourth reference value is the fourth baseline 400. Both the third baseline 300 and the fourth baseline 400 are close to the horizontal coordinate axis. The third duration is used to represent the inhalation time of a small animal, and the fourth duration is used to represent the exhalation time of a small animal. The fourth time threshold may be a time length obtained based on experience and sufficient to determine whether an asphyxia alarm event occurs. The third duration and the fourth duration are valid within this time length. The purpose of setting the third reference value and the fourth reference value is to filter out interference. Since the breathing of a small animal is weak, when the airway flow rate is between the third reference value and the fourth reference value, in order to reduce misjudgment, this time period is not regarded as the inhalation time or the breathing time of the small animal.

[0092] Step 2410, calculate the sum of the third duration and the fourth duration.

[0093] Step 2420, determine whether the sum of the third duration and the fourth duration is greater than the second asphyxia time threshold. If it is greater than the second asphyxia time threshold, execute Step 2430. If it is not greater than the second asphyxia time threshold, execute Step 2440.

[0094] Step 2430, obtain the recognition result of the occurrence of the asphyxia alarm event.

[0095] Step 2440, obtain the recognition result that the asphyxia alarm event has not occurred.

[0096] In Step 2000, there are many ways to comprehensively recognize the occurrence of a certain type of alarm event based on at least two types of parameter data. For a certain type of alarm event, if the occurrence of this type of alarm event is recognized based on at least two types of parameter data, then the small animal has this type of alarm event. For example, for the asphyxia alarm event, if the recognition result obtained based on the carbon dioxide concentration according to any of the above methods is that the asphyxia alarm event has occurred, and the recognition result obtained based on the airway flow rate according to any of the above methods is that the asphyxia alarm event has not occurred, then it is determined that the asphyxia alarm event has not occurred. In other embodiments, it is also possible to comprehensively determine whether this type of alarm event has occurred according to the quantity or proportion of the parameter data for which the occurrence of a certain type of alarm event is recognized. For example, among the obtained parameter data, if more than half of the parameter data corresponding recognition results are that this type of alarm event has occurred, then it is determined that this type of alarm event has occurred.

[0097] Step 3000, output the corresponding alarm information when the alarm event occurs.

[0098] In the above embodiments, the alarm events occurring in small animals are comprehensively judged according to different parameter data, which improves the judgment accuracy of the alarm events and reduces the false alarms generated when only using a single parameter for judgment. Especially for the asphyxia alarm event, at least two parameter data, namely the carbon dioxide concentration and the airway flow rate, are used for recognition, and there is more than one method for each parameter data to recognize the alarm event, which further improves the accuracy of recognizing the asphyxia alarm event.

[0099] Those skilled in the art can understand that all or part of the functions of the various methods in the above embodiments can be implemented by hardware or by computer programs. When all or part of the functions in the above embodiments are implemented by computer programs, the programs can be stored in a computer-readable storage medium, which can include: read-only memory, random access memory, magnetic disks, optical disks, hard disks, etc. The above functions can be realized by a computer executing these programs. For example, the program is stored in the memory of the device, and when the processor executes the program in the memory, the above-mentioned all or part of the functions can be realized. In addition, when all or part of the functions in the above embodiments are implemented by computer programs, the programs can also be stored in storage media such as servers, other computers, magnetic disks, optical disks, flash drives or external hard drives, and saved to the memory of the local device by downloading or copying, or the system of the local device is updated. When the processor executes the program in the memory, all or part of the functions in the above embodiments can be realized.

[0100] The above uses specific examples to illustrate the present invention, which is only for helping to understand the present invention and is not intended to limit the present invention. For those skilled in the art of the present invention, according to the idea of the present invention, several simple deductions, deformations or substitutions can also be made.

Claims

1. A ventilation device, characterized in that, Comprising: A gas source interface, connecting to a gas source; A breathing circuit, connecting the gas source interface and the respiratory system of the target object to deliver the gas provided by the gas source to the target object; An anesthetic output device, configured to mix the stored anesthetic with the input gas and then output it into the breathing circuit; A breathing assistance device, providing ventilation support to the target object through the breathing circuit, and controlling the delivery of the gas provided by the gas source and the gas mixed with anesthetic output by the anesthetic output device to the target object; A processor, configured to obtain at least two parameter data that can characterize the occurrence of an alarm event during ventilation of the target object, and identify the occurrence of the alarm event based on the obtained parameter data; wherein, the parameter data are all ventilation parameter data, or the parameter data are all physiological parameter data of the target object, or the parameter data include both ventilation parameter data and physiological parameter data of the target object; each parameter data is used to identify whether at least one type of alarm event occurs; and based on the recognition results of whether the same type of alarm event occurs according to at least two parameter data, comprehensively judge whether each type of alarm event occurs, and output corresponding alarm information when an alarm event occurs; The physiological parameter of the target object includes carbon dioxide concentration, and each type of alarm event includes an asphyxia alarm event. Identifying whether the asphyxia alarm event occurs according to the carbon dioxide concentration includes: Obtaining the maximum value and the minimum value of the carbon dioxide concentration within a preset first time threshold; calculating the difference between the maximum value and the minimum value of the carbon dioxide concentration within the first time threshold; judging whether the difference is greater than a first trigger threshold. If it is greater than the first trigger threshold, the asphyxia alarm event does not occur. If it is not greater than the first trigger threshold, the asphyxia alarm event occurs; Or, within a preset second time threshold, obtaining a first duration during which the carbon dioxide concentration exceeds a first reference value and a second duration during which the carbon dioxide concentration is lower than a second reference value, the first reference value being greater than the second reference value, the first duration being used to characterize the exhalation time of the target object, and the second duration being used to characterize the inhalation time of the target object; calculating the sum of the first duration and the second duration; judging whether the sum of the first duration and the second duration is greater than a first asphyxia time threshold. If it is not greater than the first asphyxia time threshold, the asphyxia alarm event does not occur. If it is greater than the first asphyxia time threshold, the asphyxia alarm event occurs; Or, The ventilation parameter data includes airway flow rate, and each type of alarm event includes an asphyxia alarm event. Identifying whether the asphyxia alarm event occurs according to the airway flow rate includes: Obtaining the maximum value and the minimum value of the airway flow rate within a preset third time threshold; calculating the difference between the maximum value and the minimum value of the airway flow rate within the third time threshold; judging whether the difference is greater than a second trigger threshold. If it is greater than the second trigger threshold, the asphyxia alarm event does not occur. If it is not greater than the second trigger threshold, the asphyxia alarm event occurs; Alternatively, within a preset fourth time threshold, obtain a third duration during which the airway flow rate exceeds a third reference value and a fourth duration during which the airway flow rate is lower than a fourth reference value. The third reference value is greater than the fourth reference value. The third duration is used to represent the inhalation time of the target object, and the fourth duration is used to represent the exhalation time of the target object. Calculate the sum of the third duration and the fourth duration. Determine whether the sum of the third duration and the fourth duration is greater than a second asphyxia time threshold. If it is not greater than the second asphyxia time threshold, the asphyxia alarm event has not occurred. If it is greater than the second asphyxia time threshold, the asphyxia alarm event has occurred.

2. The device according to claim 1, characterized in that, The ventilation parameter data includes at least one of airway flow rate and airway pressure, and the physiological parameter of the target object includes at least one of carbon dioxide concentration and blood oxygen saturation.

3. The device according to claim 1, characterized in that, The comprehensive judgment of whether each type of alarm event occurs based on the recognition results of whether the same type of alarm event occurs according to at least two parameter data includes: For a type of alarm event, if the occurrence of the type of alarm event is recognized according to at least two parameter data, the target object has the type of alarm event.

4. An alarm method for a ventilation device, characterized in that, Including: Obtain at least two parameter data that can represent the occurrence of an alarm event during the ventilation process of the target object. The parameter data is ventilation parameter data or the physiological parameter data of the target object. Each parameter data is used to recognize whether at least one type of alarm event occurs. Based on the recognition results of whether the same type of alarm event occurs according to at least two parameter data, comprehensively judge whether each type of alarm event occurs, and output corresponding alarm information when an alarm event occurs. The same type of alarm event includes an asphyxia alarm event. The physiological parameter data of the target object includes carbon dioxide concentration. The recognition of whether the asphyxia alarm event occurs based on the carbon dioxide concentration includes: Obtain the maximum value and the minimum value of the carbon dioxide concentration within a preset first time threshold. Calculate the difference between the maximum value and the minimum value of the carbon dioxide concentration within the first time threshold. Determine whether the difference is greater than a first trigger threshold. If it is greater than the first trigger threshold, the asphyxia alarm event has not occurred. If it is not greater than the first trigger threshold, the asphyxia alarm event has occurred. Alternatively, within a preset second time threshold, obtain a first duration during which the carbon dioxide concentration exceeds a first reference value and a second duration during which the carbon dioxide concentration is lower than a second reference value. The first reference value is greater than the second reference value. The first duration is used to represent the exhalation time of the target object, and the second duration is used to represent the inhalation time of the target object. Calculate the sum of the first duration and the second duration. Determine whether the sum of the first duration and the second duration is greater than a first asphyxia time threshold. If it is not greater than the first asphyxia time threshold, the asphyxia alarm event has not occurred. If it is greater than the first asphyxia time threshold, the asphyxia alarm event has occurred. Or, The ventilation parameter data includes airway flow velocity, and identifying whether the asphyxia alarm event occurs based on the airway flow velocity includes: Obtaining the maximum value and the minimum value of the airway flow velocity within a preset third time threshold; calculating the difference between the maximum value and the minimum value of the airway flow velocity within the third time threshold; determining whether the difference is greater than a second trigger threshold. If it is greater than the second trigger threshold, the asphyxia alarm event does not occur. If it is not greater than the second trigger threshold, the asphyxia alarm event occurs; Alternatively, within a preset fourth time threshold, obtaining a third duration during which the airway flow velocity exceeds a third reference value and a fourth duration during which the airway flow velocity is lower than a fourth reference value. The third reference value is greater than the fourth reference value. The third duration is used to characterize the inhalation time of the target object, and the fourth duration is used to characterize the exhalation time of the target object; calculating the sum of the third duration and the fourth duration; determining whether the sum of the third duration and the fourth duration is greater than a second asphyxia time threshold. If it is not greater than the second asphyxia time threshold, the asphyxia alarm event does not occur. If it is greater than the second asphyxia time threshold, the asphyxia alarm event occurs.

5. The method according to claim 4, characterized in that, The at least two types of parameter data include both the physiological parameter data of the target object and the ventilation parameter data; Comprehensively determining whether an asphyxia alarm event occurs based on the ventilation parameter data and the physiological parameter data of the target object includes: Identifying whether an asphyxia alarm event occurs based on the physiological parameters of the target object; Identifying whether an asphyxia alarm event occurs based on the ventilation parameter data; Based on the recognition results of whether an asphyxia alarm event occurs according to the ventilation parameter data and the physiological parameter data of the target object, comprehensively determining whether an asphyxia alarm event occurs.

6. The method according to claim 4 or 5, characterized in that, The ventilation parameter data includes at least one of airway flow velocity and airway pressure, and the physiological parameters of the target object include at least one of carbon dioxide concentration and blood oxygen saturation.

7. The method according to claim 4, characterized in that,Comprehensively determining whether each type of alarm event occurs based on the recognition results of whether the same type of alarm event occurs according to at least two types of parameter data includes: For a type of alarm event, if the occurrence of the type of alarm event is recognized according to at least two types of parameter data, the target object has the type of alarm event.

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