CN111921050A - Method for controlling oxygen delivery - Google Patents
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- CN111921050A CN111921050A CN202010839841.7A CN202010839841A CN111921050A CN 111921050 A CN111921050 A CN 111921050A CN 202010839841 A CN202010839841 A CN 202010839841A CN 111921050 A CN111921050 A CN 111921050A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
- A61M2016/0027—Accessories therefor, e.g. sensors, vibrators, negative pressure pressure meter
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2230/00—Measuring parameters of the user
- A61M2230/20—Blood composition characteristics
- A61M2230/205—Blood composition characteristics partial oxygen pressure (P-O2)
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2230/00—Measuring parameters of the user
- A61M2230/40—Respiratory characteristics
Abstract
The invention discloses a method for controlling oxygen delivery, which comprises the steps of setting a first oxygen supply flow model; detecting the air pressure in the oxygen therapy device; judging whether the user is in an air suction state or not according to the air pressure value and the air pressure change degree in the air delivery device; and under the condition that the user is judged to be in the inspiration state, controlling the oxygen delivery pipeline of the gas delivery device to be opened according to the first oxygen supply flow model so as to enable oxygen to be provided for the user through the gas delivery device, and closing the oxygen delivery pipeline of the gas delivery device when the opening time of the oxygen delivery pipeline of the gas delivery device reaches a set first time, wherein the first time is less than the time when the user is in the inspiration state. The method saves oxygen source, prolongs portable oxygen supply time of users, and improves life quality of users.
Description
Technical Field
The invention relates to the technical field of oxygen saving devices, in particular to a method for controlling oxygen delivery.
Background
Conventional oxygen therapy is a transnasal low flow continuous flow regime, see fig. 9, which, although a relatively simple regime, wastes a significant amount of oxygen in the expiratory phase of the patient. In addition, a large amount of oxygen is wasted during the latter part of the inspiratory phase, since the inhaled oxygen does not reach the pulmonary gas exchange sites during this period. Therefore, a series of oxygen sources, including liquid oxygen, cylinder gas oxygen and battery powered oxygen machines, are combined with various oxygen economizers to achieve an ideal oxygen-saving oxygen therapy regimen. These devices are known as pulsed oxygen systems. Various studies and clinical trials have shown that pulse oxygen delivery devices are very effective in treating a range of respiratory behaviors, such as rest, sleep or exercise.
An oxygen saver is a breathing device that regulates the flow of oxygen from an oxygen tank to a patient. The oxygen saver provides oxygen therapy and supplemental oxygen to the user to improve the user's condition of hypoxemia. Hypoxemia is the result of several chronic respiratory diseases that result in limited or restricted oxygen supply to the body, abnormally low oxygen levels, and the need for supplemental oxygen therapy, and thus, oxygen regulators play an important role in oxygen flow management.
The oxygen economizer optimizes oxygen usage by either pulse or fixed pulse oxygen delivery on demand, all types of oxygen economizers being patient breath-triggered oxygen delivery.
The oxygen saver is divided into a fixed pulse type and an oxygen supply type according to needs. Fixed pulse type economizers provide a fixed volume of oxygen during respiration. The flow of oxygen is limited to a preset volume, and such devices have a high initial flow.
When a patient inhales oxygen, the oxygen saver outputs oxygen, and when the patient exhales, the oxygen saver stops delivering the oxygen, so that a large amount of oxygen is saved, and the oxygen supply duration is longer than that of non-oxygen-saving equipment. There are various types of oxygen saver, pneumatic, electric and disposable. Advances in technology have facilitated the development of portable and lightweight oxygen savers that are available to both children and adult users. In addition to oxygen economizers, there is also a great deal of interest in the oxygen-saving equipment market for portable oxygen concentrators that have optimal functional and physical properties, including weight, size, and can be used on passenger flights. Thus, the oxygen-saving device market is expected to grow steadily during 2019 and 2027 due to the increasing adoption of portable oxygen concentrators and pulsed oxygen delivery system devices.
Despite these advances, a great deal of research is being conducted to improve the clinical effectiveness of pulsed oxygen technology. Initially, the oxygenators were not well recognized and many patients and clinicians had limited success in oxygenator applications. Although this is a problem encountered in the marketing of any new product, it is also related to the performance parameters and therapeutic efficacy of the oxygenator product.
Each manufacturer on the market currently determines by itself the volume of gas provided at each setting and often promotes clinical effectiveness equivalent to continuous flow oxygen therapy. The institutional testing found that one oxygen economizer with a tap setting of 4 provided 66 ml of oxygen per inspiration, while another oxygen economizer with a tap setting of 4 also provided 34 ml of oxygen per inspiration. Such differences in oxygen supply capacity are confusing to users and create a view in users and doctors that the oxygen saver is not working properly.
Some manufacturers have been working to increase the oxygen economy ratio, rather than working to increase patient oxygenation, which presents the problem of making the oxygen economizer unacceptable to the user. There is a teaching from this experience that clinicians need to know the performance of each model of economizer. With the rapid development of the respiratory product industry, the therapeutic performance of different oxygen-saving devices cannot be realized without the guidance of a clinician.
The current oxygen economizer application market has the problems that different oxygen economizers are same in arrangement, different in oxygen supply capacity and different in clinical effectiveness, some manufacturers only pay attention to oxygen saving after neglecting curative effects, medical staff cannot easily accept the oxygen economizer in application due to the problems, users cannot be effectively treated, the wide application of the oxygen economizer is hindered, and precious oxygen resources are wasted.
Disclosure of Invention
The present invention addresses the above problems by providing a method of controlling oxygen delivery.
The technical means adopted by the invention are as follows:
a method of controlling oxygen delivery, comprising the steps of,
setting a first oxygen supply flow model;
detecting the air pressure in the oxygen therapy device;
judging whether the user is in an air suction state or not according to the air pressure value and the air pressure change degree in the air delivery device;
and under the condition that the user is judged to be in the inspiration state, controlling the oxygen delivery pipeline of the gas delivery device to be opened according to the first oxygen supply flow model so as to provide oxygen to the user through the gas delivery device, and closing the oxygen delivery pipeline of the gas delivery device when the opening time of the oxygen delivery pipeline of the gas delivery device reaches a set first time, wherein the first time is less than the time when the user is in the inspiration state.
Furthermore, the oxygen flow rate in the first oxygen flow rate model is set according to the inhalation flow rate curve of the user, and the relationship between the oxygen flow rate in the first oxygen flow rate model and the inhalation curve of the user is as follows:
Fs1＝K*Fp，0.5≤K≤1； (1)
wherein, Fs1 is the oxygen supply flow in the first oxygen supply flow model, Fp is the corresponding inspiration flow in the inspiration flow curve of the user, and K is the oxygen supply coefficient.
Further, the oxygen flow rate in the first oxygen flow rate model is set according to a set oxygen volume, and the relationship between the first oxygen flow rate model and the set oxygen volume is as follows:
Fs2＝Vt/t1； (2)
where Vt is the set oxygen volume, t1 is the first time, and Fs2 is the oxygen flow rate.
Further, the method also comprises the following steps of,
setting a second oxygen supply flow model;
detecting the oxygen flow in the oxygen delivery device;
judging whether the user is in an expiratory state or not according to the oxygen flow value and the oxygen flow change degree in the gas transmission device;
and when the time that the user is in the exhalation state is judged, calculating the time that the user is in the exhalation state, and when the time that the user is in the exhalation state is greater than or equal to a set second time, controlling an oxygen delivery pipeline of the gas delivery device to be opened according to the second oxygen supply flow model.
Further, the method also comprises the following steps of,
setting a target blood oxygen concentration value Ct of a user;
detecting a current blood oxygen concentration value Cs of a user;
comparing the target blood oxygen concentration value Ct of the set user with the current blood oxygen concentration value Cs of the user, judging whether the current blood oxygen concentration value Cs of the user is smaller than the target blood oxygen concentration value Ct of the set user, and if so, adjusting the oxygen supply coefficient;
K′＝(Ct/Cs)*K (3)
wherein K' is the adjusted oxygen supply coefficient.
Further, the method also comprises the following steps of,
setting a target blood oxygen concentration value Ct of a user;
detecting a current blood oxygen concentration value Cs of a user;
comparing the target blood oxygen concentration value Ct of the set user with the current blood oxygen concentration value Cs of the user, judging whether the current blood oxygen concentration value Cs of the user is smaller than the target blood oxygen concentration value Ct of the set user, and if so, adjusting the set oxygen supply volume Vt;
Vt′＝(Ct/Cs)*Vt (4)
where Vt' is the adjusted oxygen supply volume.
Further, the first time is determined by equation (1):
t1＝kT1，k＝0.4～0.6 (5)
where T1 is the first time and T1 is the average time the user was in the inspiratory state for a period of time from some time prior to the current time.
Further, the first time is determined by equation (1):
t1＝kT1，k＝0.2～0.4 (6)
where T1 is the first time and T1 is the average time the user was in the inspiratory state for a period of time from some time prior to the current time.
Further, the second time is determined by equation (2):
t2＝kT2，k＝0.6～0.8 (7)
wherein T2 is a first time and T2 is an average time that the user is in an expiratory state during a period of time from a time prior to the current time.
Compared with the prior art, the method for controlling oxygen delivery has the following advantages that the oxygen supply method aiming at improving the oxygenation of the user and improving the blood oxygen saturation of the user realizes the treatment effect superior to the traditional open-loop low-flow continuous flow oxygen therapy. On the basis of ensuring the clinical effectiveness, the oxygen source is saved, the portable oxygen supply time of the user is prolonged, and the life quality of the user is improved. On the basis of ensuring the clinical effectiveness, the oxygen resource is saved, and the method has good economic benefit.
Drawings
FIG. 1 is a schematic illustration of an apparatus for controlling oxygen delivery as disclosed herein;
FIG. 2 is a flow chart of the inspiratory phase of the method of controlling oxygen delivery in accordance with the present invention;
FIG. 3 is a schematic illustration of an oxygen supply profile in a first embodiment of the method of controlling oxygen delivery as disclosed in the present invention;
FIG. 4 is a flow chart of the expiratory phase of the method of controlling oxygen delivery of the present invention;
FIG. 5 is a schematic diagram of a user's breathing curve and ventilation curve in a second embodiment of the method of controlling oxygen delivery as disclosed in the present invention;
FIG. 6 is a schematic diagram of a user's breathing curve and ventilation curve in a third embodiment of the method of controlling oxygen delivery as disclosed in the present invention;
FIG. 7 is a schematic diagram of a user's breathing curve and ventilation curve in a fourth embodiment of the method of controlling oxygen delivery as disclosed in the present invention;
FIG. 8 is a schematic diagram illustrating the control principle of the apparatus for controlling oxygen delivery according to the present invention;
fig. 9 is a schematic diagram of spontaneous respiration of a human body.
Detailed Description
Fig. 1 is a schematic diagram of the apparatus for controlling oxygen delivery according to the present disclosure, including,
an external oxygen inlet 10, wherein the external oxygen inlet 10 is an input interface for connecting with an external oxygen source, and the external oxygen source may be a steel cylinder, a hospital equipment belt, an oxygen machine, etc.;
an input oxygen source pressure sensor 20 for monitoring the pressure of the input oxygen source; the input oxygen source pressure sensor 20 is installed on a pipeline communicated with the external oxygen inlet 10;
the proportional solenoid valve 30 is used for controlling the oxygen supply flow; the other end of the pipeline communicated with the external oxygen inlet 10 is divided into two oxygen supply channels which are arranged in parallel and are respectively a first oxygen supply channel and a second oxygen supply channel, the first oxygen supply channel is provided with a proportional electromagnetic valve 30 and an oxygen flow sensor 40, the second oxygen supply channel is provided with a manual air supply control valve 60, when the device works normally, the second oxygen supply channel does not work, and the first oxygen supply channel and the second oxygen supply channel are communicated with an oxygen supply outlet 70 through pipelines;
an oxygen flow sensor 40 for monitoring oxygen supply flow information in real time; the oxygen flow sensor 40 is arranged on the first oxygen supply channel and is used for monitoring the oxygen supply flow on the oxygen supply channel in real time;
an oxygen supply outlet pressure sensor 50 for monitoring airway pressure of the user during breathing in real time; the two oxygen supply channels are communicated with an oxygen supply outlet 70 through a pipeline, and the pipeline is provided with an oxygen supply outlet pressure sensor 50 which can monitor the airway pressure of a user during breathing in real time;
an oxygen supply outlet 70 for connection to a user breathing circuit;
a manual oxygen supply control valve 60 for controlling the oxygen supply device 1 to supply continuous flow oxygen supply when the oxygen supply cannot be performed by an electronic oxygen saving method due to power failure or the like;
a blood oxygen concentration information receiving unit 80 for receiving blood oxygen concentration information from the user terminal;
the main control unit 90 is used for monitoring oxygen supply according to a set oxygen supply mode; the main control unit 90 comprises a central control unit 901 and a memory 902, and the main control unit 90 is connected with the input oxygen source pressure sensor 20, the proportional solenoid valve 30, the oxygen flow sensor 40, the oxygen supply outlet pressure sensor 50 and the blood oxygen concentration information receiving unit 80, and is used for receiving various signals acquired by the sensors, processing the signals and controlling corresponding execution components to perform corresponding actions;
a power management unit 100 for selecting a power supply and managing charging and discharging of a battery;
and the human-computer interaction unit 110 is used for setting/displaying information such as oxygen supply modes and parameters by a user.
External oxygen is input from an external oxygen inlet 10 and is divided into two oxygen supply channels. One passage is that oxygen flows through the proportional solenoid valve 30, and the main control unit 90 controls the opening degree of the proportional solenoid valve 30, so that the proportional solenoid valve 30 outputs oxygen gas flows of different flow rates. The oxygen output from the proportional solenoid valve 30 enters the oxygen flow sensor 40, and the oxygen flowing out from the oxygen flow sensor 40 is connected to the oxygen supply outlet 70, which is connected to the respiratory tract of the user and enters the lungs of the user for gas exchange. The other channel is that the oxygen is connected with a manual air supply control valve 60, the oxygen flowing out of the manual air supply control valve 60 is connected with an oxygen supply outlet 70, and the oxygen supply outlet is connected with a breathing pipeline of the user and enters the lung of the user for gas exchange. At the same time, only one of the two oxygen supply channels can be selected for supplying oxygen.
Example 1
As shown in fig. 2, 3 and 4, a first embodiment of the disclosed method of controlling oxygen delivery, including,
setting a first oxygen supply flow model;
detecting the air pressure in the oxygen therapy device;
judging whether the user is in an air suction state or not according to the air pressure value and the air pressure change degree in the air delivery device;
under the condition that the user is judged to be in the inspiration state, controlling the oxygen delivery pipeline of the gas delivery device to be opened according to the first oxygen supply flow model so as to enable oxygen to be provided for the user through the gas delivery device, and closing the oxygen delivery pipeline of the gas delivery device when the opening time of the oxygen delivery pipeline of the gas delivery device reaches a set first time, wherein the first time is less than the time when the user is in the inspiration state;
setting a second oxygen supply flow model;
detecting the oxygen flow in the oxygen delivery device;
judging whether the user is in an expiratory state or not according to the oxygen flow value and the oxygen flow change degree in the gas transmission device;
and when the time that the user is in the exhalation state is judged, calculating the time that the user is in the exhalation state, and when the time that the user is in the exhalation state is greater than or equal to a set second time, controlling an oxygen delivery pipeline of the gas delivery device to be opened according to the second oxygen supply flow model.
Specifically, the oxygen flow rate in the first oxygen flow rate model is set according to an inhalation flow rate curve of the user, and the relationship between the oxygen flow rate in the first oxygen flow rate model and the inhalation flow rate curve of the user is as follows:
Fs1＝K*Fp，0.5≤K≤1； (1)
wherein, Fs1 is the oxygen supply flow in the first oxygen supply flow model, Fp is the corresponding inspiration flow in the inspiration flow curve of the user, and K is the oxygen supply coefficient.
When the oxygen delivery device is used for supplying oxygen to a user, firstly, a breathing curve test needs to be performed on the user, in the process of the breathing curve test of the user, after the main controller 90 detects the breathing action of the user, the proportional valve 30 is completely opened, the oxygen flow sensor 40 collects an oxygen flow signal 41 on a first oxygen supply channel in real time in the whole breathing phase and transmits the oxygen flow signal 41 to the main control unit 90, the main control unit 90 samples the oxygen flow signal 41 at a certain sampling time interval, such as 100 microseconds and stores the sampling time interval into the memory 902, curve fitting is performed on all collection points in the whole breathing phase to serve as user breathing curve data Fp, the breathing curve data is stored into the memory, and the oxygen supply flow in the first oxygen supply flow model is set according to Fp and K; as shown in fig. 8, the oxygen outlet pressure sensor 50 collects the pressure signal 51 on the pipeline connected to the oxygen outlet 70 in real time, and transmits the pressure signal 51 to the main control unit 90, the main control unit 90 samples the pressure signal 51 at a certain sampling time interval, such as 100 microseconds, filters the sampled data, such as a sliding average filtering method, and stores the sampled data into a pressure signal array, such as an array of 20 elements, and the main control unit fits the pressure signal shape in real time, such as fitting a pressure curve y1 ═ b1 × x + b0 by using a least square method, where y1 is the fitted pressure curve, x is the sampling time, b1 is the slope of the fitted pressure curve, b0 is the initial value of the fitted pressure curve, when the slope b1 of the pressure curve is greater than a certain threshold (according to the difference of the sensitivity, thresholds of different levels, such as 0.2,0.3, or 0.4, and when the pressure is greater than a certain preset value, judging that the user has an inspiration action, wherein the user is in an inspiration state at the moment;
in the case that it is determined that the user is in the inspiration state, the control unit 90 controls the proportional solenoid valve 30 to open a certain opening degree, so that the oxygen supply amount passing through the proportional solenoid valve 30 supplies oxygen according to a set first oxygen supply flow model, and closes the oxygen supply pipeline of the gas delivery device when the opening time of the oxygen supply pipeline of the gas delivery device reaches a set first time, the first time is less than the time when the user is in the inspiration state, so that oxygen is supplied to the user through a first oxygen supply channel, the first oxygen supply flow curve is determined according to the inspiratory flow characteristic curve of the human body, the volume of the gas delivered to the respiratory tract of the user is shown in fig. 3 and can be set to different gears, such as a curve 303 shown in fig. 3, a curve 304, a curve 305, a curve 306, and a curve 307, which can respectively represent 5 gears, 4 gears, 3 gears, 2 gears and 1 gears, namely, the oxygen flow is decreased gradually according to the oxygen supply coefficient K values and can be set according to the requirements.
The oxygen flow sensor 40 collects the oxygen flow signal 41 on the first oxygen supply channel in real time, and transmits the oxygen flow signal 41 to the main control unit 90, the main control unit 90 samples the oxygen flow signal 41 at a certain sampling time interval, such as 100 microseconds, filters the sampled data, such as a sliding average filtering method, and stores the sampled data into an array of flow signals, such as an array of 20 elements, the main control unit 90 fits the flow signal shape in real time, such as a least square method is adopted to fit a flow curve y 2-b 3 x + b2, wherein y2 is the fitted flow curve, x is the sampling time, b3 is the slope of the fitted flow curve, b2 is the initial value of the fitted flow curve, when the slope b3 of the flow curve is greater than a certain threshold (according to the difference of sensitivity, thresholds of different levels, such as 0.2,0.3 or 0.4), it is determined that the user has an exhalation action, the user is now in an expiratory state.
When the main control unit judges that the user is in the exhalation state, the time that the user is in the exhalation state is calculated, after the time that the user is in the exhalation state is greater than or equal to a set second time, the second time is less than the total time that the user is in the exhalation state, the main control unit 90 controls the proportional solenoid valve 30 to be opened according to a set opening degree, so that the flow of oxygen reaches a set second oxygen supply flow and is supplied to the user through a first oxygen supply channel, and an oxygen pool is formed at the tail end of the exhalation state of the user, namely, the oxygen pool 302 is formed in the respiratory tract of the user at the end stage of the exhalation state of the user, the oxygen pool is used for flushing the respiratory tract of the user at the end stage of the exhalation of the user, discharging carbon dioxide staying in the respiratory tract of the user at the end stage of the exhalation of the user, and forming a high oxygen pool in the respiratory tract, and, the second oxygen flow model is determined by the minimum flow required by the oxygen pool, and is generally 0.5-1L/Ct, for example, in the embodiment, the second oxygen flow is 1L/Ct.
In this embodiment, be in the state of breathing in and exhale the state and then control proportional solenoid valve's switch through detecting the user to be used for accurate control to through first oxygen suppliment passageway to the time that the user provided oxygen, on the basis of guaranteeing clinical validity, because saved the oxygen gas source, prolonged the portable oxygen suppliment time of user going out, improved user's quality of life, practiced thrift the oxygen resource, have good economic benefits.
Further, the method also comprises the following steps of,
setting a target blood oxygen concentration value Ct of a user;
detecting a current blood oxygen concentration value Cs of a user;
comparing the target blood oxygen concentration value Ct of the set user with the current blood oxygen concentration value Cs of the user, judging whether the current blood oxygen concentration value Cs of the user is smaller than the target blood oxygen concentration value Ct of the set user, and if so, adjusting the oxygen supply coefficient;
K′＝(Ct/Cs)*K (3)
wherein K' is the adjusted oxygen supply coefficient.
Specifically, the main control unit 90 collects the current blood oxygen concentration information 81 received by the blood oxygen concentration information receiving unit 80 in real time, and compares the detected current blood oxygen concentration value Cs of the user with the set target blood oxygen concentration Ct (e.g. 95%) of the user, and when the current blood oxygen concentration value of the user is smaller than the target blood oxygen concentration value Ct of the user, increases the oxygen supply coefficient, thereby increasing the oxygen supply flow rate in the first oxygen supply flow rate model, in this embodiment, the set target blood oxygen concentration Ct of the user is stored in the memory 902, the central control unit 901 calculates the adjusted oxygen supply coefficient K '(K' ≧ 1) according to the formula K '((Ct/Cs) · K), the main control unit 90 collects the actual flow rate signal 41 monitored by the oxygen flow rate sensor 40, calculates the target oxygen supply flow rate N · K' according to the set gear N, such as 4, by adopting a PID control algorithm, the control signal 31 output to the proportional solenoid valve 30 is calculated, and the main control unit 90 controls the opening of the proportional solenoid valve 30, so that the oxygen flow in the inspiratory air passage is equal to N'. multidot.K, the oxygen amount supplied to a user is increased, the oxygenation level of the user is favorably improved, and the oxygen therapy effect is improved.
Further, the method comprises the step of counting the average time of the user in the inspiration state from a certain time before the current time to the current time, wherein the first time is set according to the average time.
The first time is determined by equation (5):
t1＝kT1，k＝0.4-0.6 (5)
where T1 is the first time and T1 is the average time the user was in the inspiratory state for a period of time from some time prior to the current time.
Specifically, the main control unit 90 stores and calculates the average time that the user is in the inspiration state from a certain time before the current time to a time after the current time, for example, the average time of the last five inhalations is saved and calculated, and the first time is set according to the calculated average time, for example to 60% of the average time, i.e. oxygen is supplied to the user via the first oxygen supply channel at a first oxygen supply flow rate during the time when the start of an inspiration to 60% of the average time of the previous five inspirations is detected, at the end of the inspiratory phase, the inhaled gas remains in the airway above the respiratory bronchioles and cannot enter the lungs to exchange with blood gas, but is expelled during expiration, the amount of the gas is called physiological dead space, about 150ml for normal people, and the oxygen supply is stopped at the time point, so that the oxygen is effectively saved and the oxygen therapy effect is ensured.
Further, the method comprises the step of counting the average time of the user in the exhalation state within a period from a certain time before the current time to the current time, wherein the second time is set according to the average time.
The second time is determined by equation (6):
t2＝kT2，k＝0.6-0.8 (7)
wherein T2 is a first time and T2 is an average time that the user is in an expiratory state during a period of time from a time prior to the current time.
Specifically, the main control unit 90 stores and calculates an average time of the user in the exhalation state from a certain time before the current time to the current time, for example, stores and calculates an average time of the last five exhalations, and sets a second time according to the calculated average time, for example, the second time is set to 60% of the average time, that is, oxygen is supplied to the user through the first oxygen supply channel at the second oxygen supply flow rate when the time when inhalation is detected to reach 60% of the average time of the last five exhalations is detected.
The oxygen supply mode that the oxygen saving controller delivers the therapeutic oxygen to the respiratory tract of a user by using a plurality of specific oxygen flow rates-time functions in the specific time periods of the inhalation phase and the exhalation phase, which are provided by the invention, meets the requirement that doctors and patients can intuitively and conveniently select the oxygen supply mode capable of meeting the requirement of curative effect, and solves the problems of different oxygen supply capacities and different clinical effectiveness when different oxygen saving devices in the current oxygen saving device application market are arranged in the same way.
Example 2
FIG. 5 illustrates a second embodiment of the disclosed method for controlling oxygen delivery, including setting a first oxygen flow model;
detecting the air pressure in the oxygen therapy device;
judging whether the user is in an air suction state or not according to the air pressure value and the air pressure change degree in the air delivery device;
and under the condition that the user is judged to be in the inspiration state, controlling the oxygen delivery pipeline of the gas delivery device to be opened according to the first oxygen supply flow model so as to provide oxygen to the user through the gas delivery device, and closing the oxygen delivery pipeline of the gas delivery device when the opening time of the oxygen delivery pipeline of the gas delivery device reaches a set first time, wherein the first time is less than the time when the user is in the inspiration state.
Setting a second oxygen supply flow model;
detecting the oxygen flow in the oxygen delivery device;
judging whether the user is in an expiratory state or not according to the oxygen flow value and the oxygen flow change degree in the gas transmission device;
and when the time that the user is in the exhalation state is judged, calculating the time that the user is in the exhalation state, and when the time that the user is in the exhalation state is greater than or equal to a set second time, controlling an oxygen delivery pipeline of the gas delivery device to be opened according to the second oxygen supply flow model.
Specifically, the oxygen flow rate in the first oxygen flow rate model is set according to a set oxygen volume, and the relationship between the first oxygen flow rate model and the set oxygen volume is as follows:
Fs2＝Vt/t1； (2)
wherein, Vt is the set oxygen supply volume which is determined by the doctor according to the disease condition of the patient, t1 is the first time, and Fs2 is the oxygen supply flow.
The oxygen outlet pressure sensor 50 collects pressure signals on a pipeline communicated with the oxygen outlet 70 in real time, and transmits the pressure signals 51 to the main control unit 90, the main control unit 90 samples the pressure signals 51 at a certain sampling time interval, such as 100 microseconds, filters the sampled data, such as a sliding average filtering method, and stores the data into a pressure signal array, such as an array of 20 elements, the main control unit fits the pressure signal shape in real time, such as a least square method is adopted to fit a pressure curve y1 ═ b1 × + b0, wherein y1 is the fitted pressure curve, x is the sampling time, b1 is the slope of the fitted pressure curve, b0 is the initial value of the fitted pressure curve, when the slope b1 of the pressure curve is greater than a certain threshold (according to the difference of sensitivity, thresholds of different grades, such as 0.2,0.3 or 0.4, can be set), and when the pressure is greater than a certain preset value, judging that the user has an inspiration action, wherein the user is in an inspiration state at the moment;
in the case that it is determined that the user is in the inspiration state, the control unit 90 controls the proportional solenoid valve 30 to open by a certain opening degree, so that the oxygen supply amount passing through the proportional solenoid valve 30 reaches a set first oxygen supply flow rate, so that oxygen is supplied to the user through a first oxygen supply channel, the first oxygen supply flow rate curve is a high-flow narrow pulse, the volume of gas delivered to the respiratory tract of the user is shown in fig. 5, and may be set to different gears, as shown in fig. 4, curves 402, 403, 404, 405, 406 respectively represent 5 gears, 4 gears, 3 gears, 2 gears, and 1 gears, that is, different oxygen supply coefficients K values, and the oxygen supply amount sequentially decreases;
the oxygen flow sensor 40 collects the oxygen flow signal 41 on the first oxygen supply channel in real time, and transmits the oxygen flow signal 41 to the main control unit 90, the main control unit 90 samples the oxygen flow signal 41 at a certain sampling time interval, such as 100 microseconds, filters the sampled data, such as a sliding average filtering method, and stores the sampled data into an array of flow signals, such as an array of 20 elements, the main control unit 90 fits the flow signal shape in real time, such as a least square method is adopted to fit a flow curve y 2-b 3 x + b2, wherein y2 is the fitted flow curve, x is the sampling time, b3 is the slope of the fitted flow curve, b2 is the initial value of the fitted flow curve, when the slope b3 of the flow curve is greater than a certain threshold (according to the difference of sensitivity, thresholds of different levels, such as 0.2,0.3 or 0.4), it is determined that the user has an exhalation action, the user is now in an expiratory state.
When the main control unit judges that the user is in the exhalation state, the time that the user is in the exhalation state is calculated, after the time that the user is in the exhalation state is greater than or equal to a set second time, the second time is less than the total time that the user is in the exhalation state, the main control unit 90 controls the proportional solenoid valve 30 to be opened according to a set opening degree, so that the flow of oxygen reaches a set second oxygen supply flow and is supplied to the user through a first oxygen supply channel, and an oxygen pool is formed at the tail end of the exhalation state of the user, namely, the oxygen pool 410 is formed in the respiratory tract of the user at the end stage of the exhalation state of the user, the oxygen pool is used for flushing the respiratory tract of the user at the end stage of the exhalation of the user, discharging carbon dioxide staying in the respiratory tract of the user at the end stage of the exhalation of the user, and forming a high oxygen pool in the respiratory tract, and, the oxygen therapy effect is improved, preferably, the second oxygen supply flow is smaller than the first oxygen supply flow, so that the oxygen pool can be formed at the end of expiration of the user to improve the oxygen therapy effect, and the oxygen consumption can be reduced, the second oxygen supply flow model is determined by the minimum flow required for forming the oxygen pool, and is generally 0.5-1L/Ct, for example, in the embodiment, the second oxygen supply flow is 1L/Ct.
In this embodiment, be in the state of breathing in and exhale the state and then control proportional solenoid valve's switch through detecting the user to be used for accurate control to through first oxygen suppliment passageway to the time that the user provided oxygen, on the basis of guaranteeing clinical validity, because saved the oxygen gas source, prolonged the portable oxygen suppliment time of user going out, improved user's quality of life, practiced thrift the oxygen resource, have good economic benefits.
Further, the method also comprises the following steps of,
setting a target blood oxygen concentration value Ct of a user;
detecting a current blood oxygen concentration value Cs of a user;
comparing the target blood oxygen concentration value Ct of the set user with the current blood oxygen concentration value Cs of the user, judging whether the current blood oxygen concentration value Cs of the user is smaller than the target blood oxygen concentration value Ct of the set user, and if so, adjusting the set oxygen supply volume Vt;
Vt′＝(Ct/Cs)*Vt (4)
where Vt' is the adjusted oxygen supply volume.
Specifically, the main control unit 90 collects the current blood oxygen concentration information 81 received by the blood oxygen concentration information receiving unit 80 in real time, compares the detected current blood oxygen concentration value Cs of the user with the target blood oxygen concentration Ct (for example, 95%) of the user, and increases the set oxygen supply volume Vt when the current blood oxygen concentration value of the user is smaller than the target blood oxygen concentration value Ct of the user, so as to increase the first oxygen supply flow rate, in this embodiment, the target blood oxygen concentration Ct of the user is stored in the memory 902, the central control unit 901 calculates the adjusted set oxygen supply volume Vt 'according to the formula Vt' ═ Ct/Cs Vt, the main control unit 90 collects the actual flow rate signal 41 monitored by the oxygen flow rate sensor 40, calculates the target oxygen supply volume N K according to the set gear N, for example, 4, and calculates the control signal 31 output to the proportional solenoid valve 30 by using the PID control algorithm, the main control unit 90 controls the opening of the proportional solenoid valve 30, so that the flow of oxygen in the inspiratory air passage is equal to N x K, the amount of oxygen supplied to a user is increased, the oxygenation level of the user is improved, and the oxygen therapy treatment effect is improved.
Further, the method comprises the step of counting the average time of the user in the inspiration state from a certain time before the current time to the current time, wherein the first time is set according to the average time.
The first time is determined by equation (1):
t1＝kT1，k＝0.2-0.4 (6)
where T1 is the first time and T1 is the average time the user was in the inspiratory state for a period of time from some time prior to the current time.
Specifically, the main control unit 90 stores and calculates an average time of the user in the inhalation state from a certain time before the current time to a time after the current time, for example, stores and calculates an average time of the previous five inhalations, and sets a first time according to the calculated average time, for example, the first time is set to 60% of the average time, that is, oxygen is supplied to the user through the first oxygen supply channel at the first oxygen supply flow rate in a time from when the inhalation start is detected to 60% of the average time of the previous five inhalations.
Further, the method comprises the step of counting the average time of the user in the exhalation state within a period from a certain time before the current time to the current time, wherein the second time is set according to the average time.
The second time is determined by equation (2):
t2＝kT2，k＝0.6-0.8 (7)
wherein T2 is a first time and T2 is an average time that the user is in an expiratory state during a period of time from a time prior to the current time.
Specifically, the main control unit 90 stores and calculates an average time of the user in the exhalation state from a certain time before the current time to the current time, for example, stores and calculates an average time of the last five exhalations, and sets a second time according to the calculated average time, for example, the second time is set to 60% of the average time, that is, oxygen is supplied to the user through the first oxygen supply channel at the second oxygen supply flow rate when the time when inhalation is detected to reach 60% of the average time of the last five exhalations is detected.
Example 3
FIG. 6 illustrates a third embodiment of the disclosed method for controlling oxygen delivery, including setting a first oxygen flow model;
detecting the air pressure in the oxygen therapy device;
judging whether the user is in an air suction state or not according to the air pressure value and the air pressure change degree in the air delivery device;
under the condition that the user is judged to be in the inspiration state, controlling the oxygen delivery pipeline of the gas delivery device to be opened according to the first oxygen supply flow model so as to enable oxygen to be provided for the user through the gas delivery device, and closing the oxygen delivery pipeline of the gas delivery device when the opening time of the oxygen delivery pipeline of the gas delivery device reaches a set first time, wherein the first time is less than the time when the user is in the inspiration state;
the oxygen supply flow in the first oxygen supply flow model is set according to the inspiration flow curve of the user, and the relationship between the oxygen supply flow in the first oxygen supply flow model and the inspiration curve of the user is as follows:
Fs1＝K*Fp，0.5≤K≤1； (1)
wherein, Fs1 is the oxygen supply flow in the first oxygen supply flow model, Fp is the corresponding inspiration flow in the inspiration flow curve of the user, and K is the oxygen supply coefficient.
When the oxygen delivery device is used for supplying oxygen to a user, firstly, a breathing curve test needs to be performed on the user, in the process of the breathing curve test of the user, after the main controller 90 detects the breathing action of the user, the proportional valve 30 is completely opened, the oxygen flow sensor 40 collects an oxygen flow signal 41 on a first oxygen supply channel in real time in the whole breathing phase and transmits the oxygen flow signal 41 to the main control unit 90, the main control unit 90 samples the oxygen flow signal 41 at a certain sampling time interval, such as 100 microseconds and stores the sampling time interval into the memory 902, curve fitting is performed on all collection points in the whole breathing phase to serve as user breathing curve data Fp, the breathing curve data is stored into the memory, and the oxygen supply flow in the first oxygen supply flow model is set according to Fp and K; as shown in fig. 8, the oxygen outlet pressure sensor 50 collects the pressure signal 51 on the pipeline connected to the oxygen outlet 70 in real time, and transmits the pressure signal 51 to the main control unit 90, the main control unit 90 samples the pressure signal 51 at a certain sampling time interval, such as 100 microseconds, filters the sampled data, such as a sliding average filtering method, and stores the sampled data into a pressure signal array, such as an array of 20 elements, and the main control unit fits the pressure signal shape in real time, such as fitting a pressure curve y1 ═ b1 × x + b0 by using a least square method, where y1 is the fitted pressure curve, x is the sampling time, b1 is the slope of the fitted pressure curve, b0 is the initial value of the fitted pressure curve, when the slope b1 of the pressure curve is greater than a certain threshold (according to the difference of the sensitivity, thresholds of different levels, such as 0.2,0.3, or 0.4, and when the pressure is greater than a certain preset value, judging that the user has an inspiration action, wherein the user is in an inspiration state at the moment;
in the case that it is determined that the user is in the inspiration state, the control unit 90 controls the proportional solenoid valve 30 to open a certain opening degree, so that the oxygen supply amount passing through the proportional solenoid valve 30 supplies oxygen according to a set first oxygen supply flow model, and closes the oxygen supply pipeline of the gas delivery device when the opening time of the oxygen supply pipeline of the gas delivery device reaches a set first time, the first time is less than the time when the user is in the inspiration state, so that oxygen is supplied to the user through a first oxygen supply channel, the first oxygen supply flow curve is determined according to the inspiratory flow characteristic curve of the human body, the volume of the gas delivered to the respiratory tract of the user is shown in fig. 3 and can be set to different gears, such as the curve 303 shown in fig. 6, the curve 304, the curve 305, the curve 306, and the curve 307, which can respectively represent 5 gears, 4 gears, 3 gears, 2 gears and 1 gears, namely, the oxygen flow is decreased gradually according to the oxygen supply coefficient K values and can be set according to the requirements.
In this embodiment, be in the state of breathing in and then control proportional solenoid valve's switch through detecting the user to be used for accurate control to through first oxygen suppliment passageway to the time of user's oxygen is provided, on the basis of guaranteeing clinical validity, because saved the oxygen gas source, prolonged the portable oxygen suppliment time of user going out, improved user's quality of life, practiced thrift the oxygen resource, have good economic benefits.
Further, the method also comprises the following steps of,
setting a target blood oxygen concentration value Ct of a user;
detecting a current blood oxygen concentration value Cs of a user;
comparing the target blood oxygen concentration value Ct of the set user with the current blood oxygen concentration value Cs of the user, judging whether the current blood oxygen concentration value Cs of the user is smaller than the target blood oxygen concentration value Ct of the set user, and if so, adjusting the oxygen supply coefficient;
K′＝(Ct/Cs)*K (3)
wherein K' is the adjusted oxygen supply coefficient.
Specifically, the main control unit 90 collects the current blood oxygen concentration information 81 received by the blood oxygen concentration information receiving unit 80 in real time, and compares the detected current blood oxygen concentration value Cs of the user with the set target blood oxygen concentration Ct (e.g. 95%) of the user, and when the current blood oxygen concentration value of the user is smaller than the target blood oxygen concentration value Ct of the user, increases the oxygen supply coefficient, thereby increasing the oxygen supply flow rate in the first oxygen supply flow rate model, in this embodiment, the set target blood oxygen concentration Ct of the user is stored in the memory 902, the central control unit 901 calculates the adjusted oxygen supply coefficient K '(K' ≧ 1) according to the formula K '((Ct/Cs) · K), the main control unit 90 collects the actual flow rate signal 41 monitored by the oxygen flow rate sensor 40, calculates the target oxygen supply flow rate N · K' according to the set gear N, such as 4, by adopting a PID control algorithm, the control signal 31 output to the proportional solenoid valve 30 is calculated, and the main control unit 90 controls the opening of the proportional solenoid valve 30, so that the oxygen flow in the inspiratory air passage is equal to N'. multidot.K, the oxygen amount supplied to a user is increased, the oxygenation level of the user is favorably improved, and the oxygen therapy effect is improved.
Further, the method comprises the step of counting the average time of the user in the inspiration state from a certain time before the current time to the current time, wherein the first time is set according to the average time.
The first time is determined by equation (5):
t1＝kT1，k＝0.4-0.6 (5)
where T1 is the first time and T1 is the average time the user was in the inspiratory state for a period of time from some time prior to the current time.
Specifically, the main control unit 90 stores and calculates an average time of the user in the inhalation state from a certain time before the current time to a time after the current time, for example, stores and calculates an average time of the previous five inhalations, and sets a first time according to the calculated average time, for example, the first time is set to 60% of the average time, that is, oxygen is supplied to the user through the first oxygen supply channel at the first oxygen supply flow rate in a time from when the inhalation start is detected to 60% of the average time of the previous five inhalations.
The oxygen-saving controller provided by the invention can deliver therapeutic oxygen to the respiratory tract of a user by a plurality of specific oxygen flow rates-time functions in an oxygen supply mode according to the set blood oxygen concentration as a control target in a specific time period of an inspiratory phase, so that doctors and patients can intuitively and conveniently select an oxygen supply mode capable of meeting the requirement of a curative effect, and the problems of different oxygen supply capacities and different clinical effectiveness when different oxygen-saving devices in the current oxygen-saving device application market are arranged in the same way are solved.
Example 4
Fig. 7 illustrates a fourth embodiment of the disclosed method of controlling oxygen delivery, comprising,
setting a first oxygen supply flow model;
detecting the air pressure in the oxygen therapy device;
judging whether the user is in an air suction state or not according to the air pressure value and the air pressure change degree in the air delivery device;
and under the condition that the user is judged to be in the inspiration state, controlling the oxygen delivery pipeline of the gas delivery device to be opened according to the first oxygen supply flow model so as to provide oxygen to the user through the gas delivery device, and closing the oxygen delivery pipeline of the gas delivery device when the opening time of the oxygen delivery pipeline of the gas delivery device reaches a set first time, wherein the first time is less than the time when the user is in the inspiration state.
Further, the oxygen flow rate in the first oxygen flow rate model is set according to a set oxygen volume, and the relationship between the first oxygen flow rate model and the set oxygen volume is as follows:
Fs2＝Vt/t1； (2)
wherein, Vt is the set oxygen supply volume which is determined by the doctor according to the disease condition of the patient, t1 is the first time, and Fs2 is the oxygen supply flow.
The oxygen outlet pressure sensor 50 collects pressure signals on a pipeline communicated with the oxygen outlet 70 in real time, and transmits the pressure signals 51 to the main control unit 90, the main control unit 90 samples the pressure signals 51 at a certain sampling time interval, such as 100 microseconds, filters the sampled data, such as a sliding average filtering method, and stores the data into a pressure signal array, such as an array of 20 elements, the main control unit fits the pressure signal shape in real time, such as a least square method is adopted to fit a pressure curve y1 ═ b1 × + b0, wherein y1 is the fitted pressure curve, x is the sampling time, b1 is the slope of the fitted pressure curve, b0 is the initial value of the fitted pressure curve, when the slope b1 of the pressure curve is greater than a certain threshold (according to the difference of sensitivity, thresholds of different grades, such as 0.2,0.3 or 0.4, can be set), and when the pressure is greater than a certain preset value, judging that the user has an inspiration action, wherein the user is in an inspiration state at the moment;
in the case that it is determined that the user is in the inspiration state, the control unit 90 controls the proportional solenoid valve 30 to open by a certain opening degree, so that the oxygen supply amount passing through the proportional solenoid valve 30 reaches a set first oxygen supply flow rate, so that oxygen is supplied to the user through a first oxygen supply channel, the first oxygen supply flow rate curve is a high-flow narrow pulse, the volume of gas delivered to the respiratory tract of the user is shown in fig. 7, and may be set to different gears, as shown in fig. 7, curves 602, 603, 604, 605, 606 respectively represent 5 gears, 4 gears, 3 gears, 2 gears, and 1 gears, that is, different oxygen supply coefficients K values, and the oxygen flow rate is sequentially decreased;
in this embodiment, be in the state of breathing in and then control proportional solenoid valve's switch through detecting the user to be used for accurate control to through first oxygen suppliment passageway to the time of user's oxygen is provided, on the basis of guaranteeing clinical validity, because saved the oxygen gas source, prolonged the portable oxygen suppliment time of user going out, improved user's quality of life, practiced thrift the oxygen resource, have good economic benefits.
Further, setting a target blood oxygen concentration value Ct of the user;
detecting a current blood oxygen concentration value Cs of a user;
comparing the target blood oxygen concentration value Ct of the set user with the current blood oxygen concentration value Cs of the user, judging whether the current blood oxygen concentration value Cs of the user is smaller than the target blood oxygen concentration value Ct of the set user, and if so, adjusting the set oxygen supply volume Vt;
Vt′＝(Ct/Cs)*Vt (4)
where Vt' is the adjusted oxygen supply volume.
Specifically, the main control unit 90 collects the current blood oxygen concentration information 81 received by the blood oxygen concentration information receiving unit 80 in real time, compares the detected current blood oxygen concentration value Cs of the user with the target blood oxygen concentration Ct (for example, 95%) of the user, and increases the set oxygen supply volume Vt when the current blood oxygen concentration value of the user is smaller than the target blood oxygen concentration value Ct of the user, so as to increase the first oxygen supply flow rate, in this embodiment, the target blood oxygen concentration Ct of the user is stored in the memory 902, the central control unit 901 calculates the adjusted set oxygen supply volume Vt 'according to the formula Vt' ═ Ct/Cs Vt, the main control unit 90 collects the actual flow rate signal 41 monitored by the oxygen flow rate sensor 40, calculates the target oxygen supply volume N K according to the set gear N, for example, 4, and calculates the control signal 31 output to the proportional solenoid valve 30 by using the PID control algorithm, the main control unit 90 controls the opening of the proportional solenoid valve 30, so that the flow of oxygen in the inspiratory air passage is equal to N x K, the amount of oxygen supplied to a user is increased, the oxygenation level of the user is improved, and the oxygen therapy treatment effect is improved.
Further, the method comprises the step of counting the average time of the user in the inspiration state from a certain time before the current time to the current time, wherein the first time is set according to the average time.
The first time is determined by equation (1):
t1＝kT1，k＝0.2-0.4 (6)
where T1 is the first time and T1 is the average time the user was in the inspiratory state for a period of time from some time prior to the current time.
Specifically, the main control unit 90 stores and calculates an average time of the user in the inhalation state from a certain time before the current time to a time after the current time, for example, stores and calculates an average time of the previous five inhalations, and sets a first time according to the calculated average time, for example, the first time is set to 60% of the average time, that is, oxygen is supplied to the user through the first oxygen supply channel at the first oxygen supply flow rate in a time from when the inhalation start is detected to 60% of the average time of the previous five inhalations.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A method of controlling oxygen delivery, characterized by: comprises the following steps of (a) carrying out,
setting a first oxygen supply flow model;
detecting the air pressure in the oxygen therapy device;
judging whether the user is in an air suction state or not according to the air pressure value and the air pressure change degree in the air delivery device;
and under the condition that the user is judged to be in the inspiration state, controlling the oxygen delivery pipeline of the gas delivery device to be opened according to the first oxygen supply flow model so as to provide oxygen to the user through the gas delivery device, and closing the oxygen delivery pipeline of the gas delivery device when the opening time of the oxygen delivery pipeline of the gas delivery device reaches a set first time, wherein the first time is less than the time when the user is in the inspiration state.
2. The method of controlling oxygen delivery according to claim 1, wherein:
the oxygen supply flow in the first oxygen supply flow model is set according to the inspiration flow curve of the user, and the relationship between the oxygen supply flow in the first oxygen supply flow model and the inspiration curve of the user is as follows:
Fs1＝K*Fp，0.5≤K≤1； (1)
wherein, Fs1 is the oxygen supply flow in the first oxygen supply flow model, Fp is the corresponding inspiration flow in the inspiration flow curve of the user, and K is the oxygen supply coefficient.
3. The method of controlling oxygen delivery according to claim 1, wherein:
the oxygen flow rate in the first oxygen flow rate model is set according to the set oxygen volume, and the relationship between the first oxygen flow rate model and the set oxygen volume is as follows:
Fs2＝Vt/t1； (2)
where Vt is the set oxygen volume, t1 is the first time, and Fs2 is the oxygen flow rate.
4. The method of controlling oxygen delivery according to any one of claims 1 to 3, wherein: also comprises the following steps of (1) preparing,
setting a second oxygen supply flow model;
detecting the oxygen flow in the oxygen delivery device;
judging whether the user is in an expiratory state or not according to the oxygen flow value and the oxygen flow change degree in the gas transmission device;
and when the time that the user is in the exhalation state is judged, calculating the time that the user is in the exhalation state, and when the time that the user is in the exhalation state is greater than or equal to a set second time, controlling an oxygen delivery pipeline of the gas delivery device to be opened according to the second oxygen supply flow model.
5. The method of controlling oxygen delivery according to claim 2, wherein: also comprises the following steps of (1) preparing,
setting a target blood oxygen concentration value Ct of a user;
detecting a current blood oxygen concentration value Cs of a user;
comparing the target blood oxygen concentration value Ct of the set user with the current blood oxygen concentration value Cs of the user, judging whether the current blood oxygen concentration value Cs of the user is smaller than the target blood oxygen concentration value Ct of the set user, and if so, adjusting the oxygen supply coefficient;
K′＝(Ct/Cs)*K (3)
wherein K' is the adjusted oxygen supply coefficient.
6. The method of controlling oxygen delivery according to claim 3, wherein: also comprises the following steps of (1) preparing,
setting a target blood oxygen concentration value Ct of a user;
detecting a current blood oxygen concentration value Cs of a user;
comparing the target blood oxygen concentration value Ct of the set user with the current blood oxygen concentration value Cs of the user, judging whether the current blood oxygen concentration value Cs of the user is smaller than the target blood oxygen concentration value Ct of the set user, and if so, adjusting the set oxygen supply volume Vt;
Vt′＝(Ct/Cs)*Vt (4)
where Vt' is the adjusted oxygen supply volume.
7. The method of controlling oxygen delivery according to claim 2, wherein:
the first time is determined by equation (1):
t1＝kT1，k＝0.4～0.6 (5)
where T1 is the first time and T1 is the average time the user was in the inspiratory state for a period of time from some time prior to the current time.
8. The method of controlling oxygen delivery according to claim 3, wherein:
the first time is determined by equation (1):
t1＝kT1，k＝0.2～0.4 (6)
where T1 is the first time and T1 is the average time the user was in the inspiratory state for a period of time from some time prior to the current time.
9. The method of controlling oxygen delivery according to claim 4, wherein:
the second time is determined by equation (2):
t2＝kT2，k＝0.6～0.8 (7)
wherein T2 is a first time and T2 is an average time that the user is in an expiratory state during a period of time from a time prior to the current time.
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