Respiratory phase determination method and device

Abstract

The embodiments of the present application provide a method and device for determining a respiratory phase, which relates to the technical field of medical devices, and aims to solve the technical problem that the determination of the respiratory phase requires the addition of additional devices and has a complex structure. The method comprises: obtaining the gas flow value in the respiratory circuit, and obtaining the pressure value of the pressure sensor; the pressure sensor is used to collect the pressure in the respiratory circuit; converting the gas flow value and the pressure value into a first value and a second value under the same reference; and determining the patient's current respiratory phase according to the difference between the first value and the second value. In this way, the patient's respiratory phase can be determined by the gas flow value and the pressure value of the respiratory circuit.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of medical device technology, and in particular to a respiratory phase determination method, a respiratory phase determination device, an electronic device, and a readable storage medium. Background Art

[0002] Ventilation therapy equipment continuously supplies oxygen through a nasal oxygen cannula inserted into the patient's nasal cavity. The patient's breathing process is divided into two processes: inhalation and exhalation. During the inhalation process, the patient needs to inhale a large amount of oxygen, while during the exhalation process, no oxygen is needed. Therefore, it is necessary to identify the patient's breathing phase (inhalation or exhalation) in real time to adjust the oxygen supply according to the breathing phase.

[0003] Since the nasal oxygen cannula is an open airway, the gas flow and pressure values ​​collected by the equipment in the nasal oxygen cannula are difficult to directly reflect the patient's own breathing conditions. Therefore, an additional measurement method is usually added for the identification of the respiratory phase. A common method is to lead a pressure measurement line from the nasal oxygen cannula to directly measure the changes in the internal pressure of the nasal oxygen cannula to determine the respiratory phase; or to measure the patient's breathing conditions through thermal sensors, chest and abdominal belts, etc. to determine the respiratory phase. However, both methods require the addition of additional devices and have complex structures. Summary of the invention

[0004] The embodiments of the present application provide a method, device, electronic device and readable storage medium for determining a respiratory phase, so as to solve the technical problem that the determination of the respiratory phase requires the addition of additional devices and has a complex structure.

[0005] On the one hand, an embodiment of the present application provides a method for determining a respiratory phase, which is applied to a ventilation therapy device, wherein the ventilation therapy device includes a breathing circuit, and the method includes:

[0006] Obtaining the gas flow value in the breathing circuit and the pressure value of the pressure sensor; the pressure sensor is used to collect the pressure in the breathing circuit;

[0007] Converting the gas flow value and the pressure value into a first value and a second value under the same reference;

[0008] The current breathing phase of the patient is determined based on the difference between the first value and the second value.

[0009] Optionally, converting the gas flow value and the pressure value into a first value and a second value under the same reference includes:

[0010] The gas flow value and the pressure value are converted into a first value and a second value of the same physical quantity.

[0011] Optionally, converting the gas flow value and the pressure value into a first value and a second value of the same physical quantity includes:

[0012] The gas flow value is converted into a first value under the physical quantity of pressure, and the pressure value is used as the second value.

[0013] Optionally, converting the gas flow value into a first value under a pressure physical quantity includes:

[0014] The square of the gas flow value is multiplied by the air resistance coefficient of the ventilation therapy device to obtain the first value under the pressure physical quantity.

[0015] Optionally, converting the gas flow value and the pressure value into a first value and a second value of the same physical quantity includes:

[0016] The pressure value is converted into a second value under the physical quantity of flow rate, and the gas flow rate value is used as the first value.

[0017] Optionally, converting the pressure value into a second value of a flow physical quantity includes:

[0018] Dividing the pressure value by the air resistance coefficient of the ventilation therapy device to obtain an intermediate value;

[0019] The square root of the intermediate value is taken to obtain the second value of the flow physical quantity.

[0020] Optionally, converting the gas flow value and the pressure value into a first value and a second value under the same reference includes:

[0021] Scaling the gas flow value proportionally as the first value, and taking the pressure value as the second value;

[0022] Alternatively, the pressure value is scaled proportionally to be used as the second value, and the gas flow value is used as the first value.

[0023] Optionally, determining the patient's current respiratory phase according to the difference between the first value and the second value includes:

[0024] Subtract the second value from the first value to obtain a first difference;

[0025] The current breathing phase of the patient is determined based on the first difference.

[0026] Optionally, determining the patient's current respiratory phase according to the first difference includes:

[0027] When the first difference is greater than 0, determining that the respiratory phase is the inspiratory phase;

[0028] When the first difference is less than 0, it is determined that the breathing phase is the exhalation phase.

[0029] In a second aspect, an embodiment of the present application provides a respiratory phase determination device, which is applied to a ventilation therapy device, wherein the ventilation therapy device includes a breathing circuit, and the device includes:

[0030] An acquisition module, used to acquire the gas flow value in the breathing circuit and the pressure value of the pressure sensor; the pressure sensor is used to collect the pressure in the breathing circuit;

[0031] A conversion module, used for converting the gas flow value and the pressure value into a first value and a second value under the same reference;

[0032] A determination module is used to determine the patient's current breathing phase according to the difference between the first value and the second value.

[0033] In a third aspect, an embodiment of the present application provides an electronic device, comprising a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction implements the described method when executed by the processor.

[0034] In a fourth aspect, an embodiment of the present application provides a readable storage medium, which stores a program or instruction, and the program or instruction implements the described method when executed by a processor.

[0035] In the embodiment of the present application, the pressure value and the gas flow value of the breathing circuit are obtained, and the pressure value and the gas flow value are converted into a first value and a second value under the same reference, and the current breathing phase of the patient is determined according to the difference between the first value and the second value. The first value and the second value are values ​​obtained after conversion, and are values ​​under the same reference. Therefore, the first value and the second value can be subtracted to obtain a difference related to the patient's breathing factors, so that the current breathing phase of the patient can be determined according to the difference. In other words, the patient's breathing phase can be determined by using only the pressure value and the gas flow value of the breathing circuit, without the need to add additional auxiliary judgment equipment, thereby simplifying the structure of the ventilation therapy equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A flowchart of a method for determining a respiratory phase provided in an embodiment of the present application;

[0037] Figure 2 This is a curve diagram of sensor signal changes caused by the patient's breathing in the embodiment of the present application;

[0038] Figure 3 This is a curve diagram of sensor signal changes caused by the adjustment of the ventilation therapy device in the embodiment of the present application;

[0039] Figure 4 In the embodiment of this application Figure 2 The curve graph and Figure 3 The relationship between the curve graph in and the sensor signal graph;

[0040] Figure 5 A curve graph of the first value and the second value and a curve graph of the difference in the embodiment of the present application;

[0041] Figure 6 This is a comparison diagram of the sensor signal diagram before and after filtering in the embodiment of the present application;

[0042] Figure 7 Schematic diagram of an electronic device in an embodiment of the present application Figure 1 ;

[0043] Figure 8 Schematic diagram of an electronic device in an embodiment of the present application Figure 2 . DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] The respiratory phase determination method, device, electronic device and readable storage medium in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0046] On the one hand, the embodiments of the present application provide a method for determining a respiratory phase, which is applied to a ventilation treatment device, such as Figure 1 As shown, the method comprises the following steps:

[0047] Step 101, obtaining the gas flow value in the breathing circuit and the pressure value of the pressure sensor; the pressure sensor is used to collect the pressure in the breathing circuit;

[0048] The ventilation therapy device in the embodiment of the present application may include a device body, a breathing circuit, a patient interface, a flow sensor and a pressure sensor. The device body is used to output gas with a preset pressure and a preset flow, and the device body includes an air outlet. The breathing circuit includes a first end and a second end that are interconnected, the first end of the breathing circuit is connected to the air outlet, and the second end is connected to the patient interface. The patient interface is used to be worn at the patient's nasal cavity, and when the patient interface is worn at the patient's nasal cavity, an air outlet gap is provided between the patient interface and the patient's nasal cavity. The pressure sensor is used to obtain the pressure value in the breathing circuit, and the flow sensor is used to obtain the gas flow value in the breathing circuit.

[0049] In specific applications, a flow sensor can be used to obtain the gas flow value in the breathing circuit, and a pressure sensor can be used to obtain the pressure value in the breathing circuit.

[0050] Step 102, converting the gas flow value and the pressure value into a first value and a second value under the same reference;

[0051] The patient's breathing can cause the pressure value and gas flow value in the breathing circuit to change. Similarly, the output pressure and output flow of the ventilation therapy device will also cause the pressure value and gas flow value in the breathing circuit to change after adjustment. In other words, the obtained pressure value and gas flow value are the result of the combined action of the patient's breathing and the ventilation therapy device.

[0052] like Figure 2 As shown in the figure, when the patient inhales, a large amount of gas is inhaled, which causes the pressure value in the breathing circuit to decrease and the gas flow value to increase; when the patient exhales, the pressure value in the breathing circuit will increase and the gas flow value will decrease. That is, the changes in the pressure value and the gas flow value caused by the patient's breathing are opposite, the pressure value decreases, the gas flow value increases; the pressure increases, and the gas flow value decreases.

[0053] like Figure 3 As shown in the figure, when the output flow of the ventilation therapy device increases, the pressure value in the breathing circuit increases, and the gas flow value increases; when the output flow of the ventilation therapy device decreases, the pressure value in the breathing circuit decreases, and the gas flow value decreases. That is, the changes in the pressure value and the gas flow value caused by the ventilation therapy device are in the same direction, and the gas flow value decreases when the pressure value decreases; and the gas flow value increases when the pressure value increases.

[0054] If the pressure value and gas flow value are expressed by formulas: pressure value = pressure value change caused by patient breathing factors + pressure value change caused by ventilation therapy equipment factors; gas flow value = gas flow value change caused by patient breathing factors + gas flow value change caused by ventilation therapy equipment factors. If an increase in pressure value or gas flow value is defined as positive and a decrease is defined as negative, since the changes in pressure value and gas flow value caused by patient breathing are in opposite directions, the signs of the patient breathing factors in the two formulas are opposite; and the changes in pressure value and gas flow value caused by ventilation therapy equipment are in the same direction, so the signs of the ventilation therapy equipment factors in the two formulas are the same. Therefore, the changes caused by the ventilation therapy equipment factors can be eliminated by subtracting the two formulas.

[0055] Since the pressure value and the gas flow value are physical quantities of different dimensions and their numerical values ​​are also different, the two formulas cannot be directly subtracted and need to be converted. The gas flow value and the pressure value are converted into the first value and the second value under the same reference.

[0056] The same reference may mean that the first value and the second value belong to physical quantities of the same dimension, or may mean that the average of the first value and the second value is within a predetermined range.

[0057] In specific applications, the gas flow value can be converted to a value with the same reference as the pressure value based on the pressure value; the pressure value can also be converted to a value with the same reference as the gas flow value based on the gas flow value; the pressure value and the gas flow value can also be converted to another same reference.

[0058] Step 103, determining the patient's current breathing phase according to the difference between the first value and the second value.

[0059] It can be seen from the above formula that after subtracting the converted first value from the second value, the difference obtained is only related to the change caused by the patient's breathing factors, so the patient's current breathing phase can be determined based on the difference.

[0060] In the embodiment of the present application, the pressure value and the gas flow value of the breathing circuit are obtained, and the pressure value and the gas flow value are converted into a first value and a second value under the same reference, and the current breathing phase of the patient is determined according to the difference between the first value and the second value. The first value and the second value are values ​​obtained after conversion, and are values ​​under the same reference. Therefore, the first value and the second value can be subtracted to obtain a difference related to the patient's breathing factors, so that the current breathing phase of the patient can be determined according to the difference. In other words, the patient's breathing phase can be determined by using only the pressure value and the gas flow value of the breathing circuit, without the need to add additional auxiliary judgment equipment, thereby simplifying the structure of the ventilation therapy equipment.

[0061] Optionally, in one embodiment of the present application, in step 102, converting the gas flow value and the pressure value into a first value and a second value under the same reference includes:

[0062] The gas flow value and the pressure value are converted into a first value and a second value of the same physical quantity.

[0063] Generally speaking, the gas flow and pressure values ​​in the gas path satisfy the following formula:

[0064] P=μ×F^2

[0065] Among them, P is the pressure value, F is the gas flow value, and μ is the air resistance coefficient, which is an inherent parameter of the ventilation therapy equipment. It can be measured in advance through experiments or iteratively calculated during operation.

[0066] Therefore, it can be known that the obtained pressure value and gas flow value can be converted by the above formula to obtain a first value and a second value under the same physical quantity, so as to subtract the first value and the second value to obtain a difference related to the patient's breathing.

[0067] Optionally, in one embodiment of the present application, converting the gas flow value and the pressure value into a first value and a second value of the same physical quantity includes:

[0068] The pressure value is converted into a second value under the flow physical quantity, and the gas flow value is used as the first value.

[0069] The acquired pressure value is converted by the above formula to obtain a second value of the flow physical quantity, so as to subtract the first value from the second value to obtain a difference value related to the patient's breathing.

[0070] Further, the pressure value is converted into a second value of the flow physical quantity, including:

[0071] Divide the pressure value by the air resistance coefficient of the ventilation therapy device to obtain the intermediate value;

[0072] Take the square root of the intermediate value to obtain the second value of the flow physical quantity.

[0073] In specific applications, the pressure value is divided by the air resistance coefficient to obtain an intermediate value, which is the square of the gas flow value. The square root of the intermediate value is then taken to obtain the second value of the flow physical quantity.

[0074] The acquired pressure value is converted by the above formula to obtain a second value of the flow physical quantity, so as to subtract the first value from the second value to obtain a difference value related to the patient's breathing.

[0075] Optionally, in one embodiment of the present application, converting the gas flow value and the pressure value into a first value and a second value of the same physical quantity includes:

[0076] The gas flow value is converted into a first value under the physical quantity of pressure, and the pressure value is used as the second value.

[0077] The obtained gas flow value is converted by the above formula to obtain a first value under the pressure physical quantity, so as to subtract the first value from the second value to obtain a difference related to the patient's breathing.

[0078] Optionally, in one embodiment of the present application, converting the gas flow value into a first value under the physical quantity of pressure includes:

[0079] The square of the pressure value is multiplied by the air resistance coefficient of the ventilation therapy device to obtain a first value of the pressure physical quantity.

[0080] The acquired pressure value is converted by the above formula to obtain a second value of the flow physical quantity, so as to subtract the first value from the second value to obtain a difference value related to the patient's breathing.

[0081] It should be noted that in the above embodiments, when converting the gas flow value into a pressure value and converting the pressure value into a gas flow value, it is not necessary to calculate the precise numerical value, and it is only necessary that the calculated first value and the second value can reflect the approximate change rule of the numerical value. For example, when converting the gas flow value into a pressure value, the pressure value P converted from the gas flow value = the square of the change in the gas flow value caused by the patient's breathing factor + the square of the change in the gas flow value caused by the ventilation therapy device factor ± 2 * the change in the gas flow value caused by the patient's breathing factor * the change in the gas flow value caused by the ventilation therapy device factor, while in the embodiments of the present application, an approximate number is used: the pressure value P converted from the gas flow value = the square of the change in the gas flow value caused by the patient's breathing factor + the square of the change in the gas flow value caused by the ventilation therapy device factor, which can reduce the difficulty of calculation.

[0082] Optionally, in one embodiment of the present application, converting the gas flow value and the pressure value into a first value and a second value under the same reference includes:

[0083] The gas flow value is scaled as the first value, and the pressure value is used as the second value;

[0084] Alternatively, the pressure value is scaled proportionally to be used as the second value, and the gas flow value is used as the first value.

[0085] In specific applications, the magnification ratio and reduction ratio can be flexibly selected according to actual conditions. For example, the gas flow value and pressure value collected from at least one respiratory cycle of the patient are obtained, the gas flow value is averaged to obtain a first mean, and the pressure value is averaged to obtain a second mean. The magnification ratio and reduction ratio can be the ratio of the first mean to the second mean.

[0086] After the gas flow value or the pressure value is scaled proportionally, the gas flow value and the pressure value are on the same basis, so the first value and the second value can be subtracted to obtain a difference related to the patient's breathing, and the patient's breathing phase can be determined based on the difference.

[0087] Optionally, in some embodiments of the present application, determining the patient's current respiratory phase according to the difference between the first value and the second value includes:

[0088] Subtract the second value from the first value to obtain a first difference;

[0089] The patient's current breathing phase is determined based on the first difference.

[0090] Since the changes in pressure value and gas flow value caused by the patient's breathing are in opposite directions, while the changes in pressure value and gas flow value caused by the ventilation therapy equipment are in the same direction, the changes caused by the ventilation therapy equipment factor can be eliminated by subtracting the second value from the first value to obtain a first difference related to the patient's breathing, and the patient's breathing phase can be judged based on the first difference.

[0091] Optionally, in one embodiment of the present application, determining the patient's current respiratory phase according to the first difference includes:

[0092] When the first difference is greater than 0, the respiratory phase is determined to be the inspiratory phase;

[0093] When the first difference is less than 0, the breathing phase is determined to be the exhalation phase.

[0094] It should be noted that, in the process of processing the pressure value and the gas flow value in the above embodiment, the pressure value change curve and the gas flow value change curve can be obtained respectively according to the pressure value and the gas flow value, and converted into a first value change curve and a second value change curve, and a difference change curve can be obtained according to the first value change curve and the second value change curve, and then the patient's breathing phase can be determined according to the difference change curve.

[0095] For ease of understanding, the following description assumes that the ventilation therapy device is in constant flow mode. Figure 4 As shown, Figure 4 The upper left curve is a curve chart showing the changes in pressure and gas flow in the breathing circuit caused by the ventilation therapy device adjusting the output flow and output pressure. Figure 4 The lower left curve is a curve chart showing the changes in pressure and gas flow in the breathing circuit caused by the patient's breathing. Figure 4 The figure on the right is the gas flow value curve and pressure value curve in the breathing circuit obtained by sensors and other devices.

[0096] After converting the gas flow value into pressure value, we can get Figure 5 The curve graph shown on the left shows the first value after conversion, and the curve shows the second value. Figure 5 Subtract the two curves in the left figure, that is, subtract the first value from the second value to get Figure 5 The difference curve on the right. The patient's respiratory phase is determined based on the difference curve.

[0097] The portion of the difference curve located above the horizontal axis is the inspiratory phase, and the portion of the difference curve located below the horizontal axis is the expiratory phase.

[0098] When obtaining gas flow and pressure values, the signal-to-noise ratio of the collected signal is low and often contains high-frequency noise, while the frequency of the respiratory signal we are concerned about is often lower than 1 Hz. Figure 6 As shown, the signal can be filtered first, and a low-pass filter can be used to filter out high-frequency signals to obtain a cleaner signal.

[0099] In a second aspect, an embodiment of the present application provides a respiratory phase determination device, which is applied to a ventilation therapy device, the ventilation therapy device includes a breathing circuit, and the device includes:

[0100] An acquisition module is used to acquire the gas flow value in the breathing circuit and the pressure value of the pressure sensor; the pressure sensor is used to collect the pressure in the breathing circuit;

[0101] A conversion module, used for converting the gas flow value and the pressure value into a first value and a second value under the same reference;

[0102] The determination module is used to determine the patient's current breathing phase according to the difference between the first value and the second value.

[0103] In the embodiment of the present application, the pressure value and the gas flow value of the breathing circuit are obtained, and the pressure value and the gas flow value are converted into a first value and a second value under the same reference, and the current breathing phase of the patient is determined according to the difference between the first value and the second value. The first value and the second value are values ​​obtained after conversion, and are values ​​under the same reference. Therefore, the first value and the second value can be subtracted to obtain a difference related to the patient's breathing factors, so that the current breathing phase of the patient can be determined according to the difference. In other words, the patient's breathing phase can be determined by using only the pressure value and the gas flow value of the breathing circuit, without the need to add additional auxiliary judgment equipment, thereby simplifying the structure of the ventilation therapy equipment.

[0104] The device in the embodiments of the present application may be a device, or a component, integrated circuit, or chip in a terminal. The device may be a mobile electronic device or a non-mobile electronic device. For example, the mobile electronic device may be a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc., and the non-mobile electronic device may be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), a teller machine, or a self-service machine, etc., which is not specifically limited in the embodiments of the present application.

[0105] The device in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system, an iOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0106] The device provided in the embodiment of the present application can implement each process implemented by the method embodiment in the figure. To avoid repetition, it will not be repeated here.

[0107] Figure 7A structural block diagram of an electronic device provided in an embodiment of the present application.

[0108] like Figure 7 As shown, an embodiment of the present application also provides an electronic device M00, including a processor M01, a memory M02, and a program or instruction stored in the memory M02 and executable on the processor M01. When the program or instruction is executed by the processor M01, the various processes of the above-mentioned method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0109] It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above.

[0110] Figure 8 A schematic diagram of the hardware structure of an electronic device to implement an embodiment of the present application.

[0111] The electronic device 1000 includes but is not limited to: a radio frequency unit 1001, a network module 1002, an audio output unit 1003, an input unit 1004, a sensor 1005, a display unit 1006, a user input unit 1007, an interface unit 1008, a memory 1009, and a processor 1010 and other components.

[0112] Those skilled in the art will appreciate that the electronic device 1000 may also include a power source (such as a battery) for supplying power to each component, and the power source may be logically connected to the processor 1010 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Figure 8 The electronic device structure shown in the figure does not constitute a limitation on the electronic device. The electronic device may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0113] It should be understood that in the embodiment of the present application, the input unit 1004 may include a graphics processor (Graphics Processing Unit, GPU) 10041 and a microphone 10042, and the graphics processor 10041 processes the image data of the static picture or video obtained by the image capture device (such as a camera) in the video capture mode or the image capture mode. The display unit 1006 may include a display panel 10061, and the display panel 10061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 1007 includes a touch panel 10071 and other input devices 10072. The touch panel 10071 is also called a touch screen. The touch panel 10071 may include two parts: a touch detection device and a touch controller. Other input devices 10072 may include, but are not limited to, a physical keyboard, a function key (such as a volume control button, a switch button, etc.), a trackball, a mouse, and a joystick, which will not be repeated here. The memory 1009 can be used to store software programs and various data, including but not limited to applications and operating systems. The processor 1010 may integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the modem processor may not be integrated into the processor 1010.

[0114] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0115] The processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0116] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0117] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0118] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0119] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

[0120] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for determining a respiratory phase, characterized in that: Applied to a ventilation therapy device, the ventilation therapy device includes a device body, a breathing circuit, a patient interface, a flow sensor, and a pressure sensor, the method includes: Obtaining the gas flow value in the breathing circuit and the pressure value of the pressure sensor; the pressure sensor is used to collect the pressure in the breathing circuit; the flow sensor is used to obtain the gas flow value in the breathing circuit; Converting the gas flow value and the pressure value into a first value and a second value under the same reference; The patient's current respiratory phase is determined based on the difference between the first value and the second value; when the difference is greater than 0, the respiratory phase is determined to be the inspiratory phase; when the difference is less than 0, the respiratory phase is determined to be the expiratory phase.

2. The method according to claim 1, characterized in that The converting the gas flow value and the pressure value into a first value and a second value under the same reference comprises: The gas flow value and the pressure value are converted into a first value and a second value of the same physical quantity.

3. The method according to claim 2, characterized in that The converting the gas flow value and the pressure value into a first value and a second value of the same physical quantity comprises: The gas flow value is converted into a first value under the physical quantity of pressure, and the pressure value is used as the second value.

4. The method according to claim 3, characterized in that The step of converting the gas flow value into a first value under a pressure physical quantity comprises: The square of the gas flow value is multiplied by the air resistance coefficient of the ventilation therapy device to obtain the first value under the pressure physical quantity.

5. The method according to claim 2, characterized in that: The converting the gas flow value and the pressure value into a first value and a second value of the same physical quantity comprises: The pressure value is converted into a second value under the physical quantity of flow rate, and the gas flow rate value is used as the first value.

6. The method according to claim 5, characterized in that The step of converting the pressure value into a second value under the flow physical quantity comprises: Dividing the pressure value by the air resistance coefficient of the ventilation therapy device to obtain an intermediate value; The square root of the intermediate value is taken to obtain the second value of the flow physical quantity.

7. The method according to claim 1, characterized in that The converting the gas flow value and the pressure value into a first value and a second value under the same reference comprises: Scaling the gas flow value proportionally as the first value, and taking the pressure value as the second value; Alternatively, the pressure value is scaled proportionally to be used as the second value, and the gas flow value is used as the first value.

8. The method according to claim 1, characterized in that Determining the patient's current respiratory phase according to the difference between the first value and the second value includes: Subtract the second value from the first value to obtain a first difference; The current breathing phase of the patient is determined based on the first difference.

9. A breathing phase determination device, characterized in that: Applied to a ventilation therapy device, the ventilation therapy device includes a breathing circuit, and the device includes: An acquisition module, used to acquire the gas flow value in the breathing circuit and the pressure value of the pressure sensor; the pressure sensor is used to collect the pressure in the breathing circuit; A conversion module, used for converting the gas flow value and the pressure value into a first value and a second value under the same reference; a determination module, configured to determine a current respiratory phase of the patient according to a difference between the first value and the second value; When the difference is greater than 0, the respiratory phase is determined to be the inhalation phase; when the difference is less than 0, the respiratory phase is determined to be the exhalation phase.

10. An electronic device, characterized in that: The method comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the method according to any one of claims 1 to 8.

11. A readable storage medium, characterized in that: The readable storage medium stores a program or an instruction, and when the program or the instruction is executed by a processor, the method according to any one of claims 1 to 8 is implemented.

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