System and method for intelligent oxygen supply according to physiological parameters

Abstract

The invention relates to the technical field of oxygen supply, and discloses an intelligent oxygen supply system and method according to physiological parameters, comprising: a detection module connected with a detection electrode and used for detecting the heart rate and oxyhemoglobin saturation of a human body; the control module receives data of the detection module, determines the optimal oxygen flow according to the heart rate and the oxyhemoglobin saturation value and controls the flow speed and the flow of the proportional electromagnetic valve. The oxygen inhalation module is connected with the proportional electromagnetic valve and supplies oxygen to the human body according to the set flow. The flow sensor is used for monitoring the actual oxygen supply flow and feeding back the actual oxygen supply flow to the control module for closed-loop control. According to the device, the heart rate and the oxyhemoglobin saturation value are calculated through the recorded pulse oximeter signals of the human body, the optimal oxygen flow is determined according to the currently measured heart rate and oxyhemoglobin saturation value and the target oxygen saturation value, and the purpose of supplying oxygen as required is achieved by controlling the flow speed and the flow of the proportional electromagnetic valve.

Description

Technical Field

[0001] The present invention relates to the technical field of oxygen supply, and in particular to a system and method for intelligent oxygen supply according to physiological parameters. Background Art

[0002] Plateau hypoxia refers to the situation in which the body tissues and organs are deprived of oxygen due to the reduction of oxygen content in the air caused by low air pressure in high altitude areas. Altitude sickness is a series of clinical syndromes caused by the incomplete or disordered adaptability of the human body to the hypoxic environment of the plateau when entering the plateau from the plains, or entering the higher altitude areas from the low altitude areas, such as headache, dizziness, vomiting, nausea, palpitations, shortness of breath, fatigue, chest tightness, dizziness, insomnia, drowsiness, abdominal distension, diarrhea, numbness of hands and feet, cyanosis of lips and fingers, and increased heart rate. Severe cases can also cause acute and chronic altitude diseases such as high-altitude pulmonary edema, high-altitude cerebral edema, high-altitude polycythemia, high-altitude hypertension, and high-altitude heart disease.

[0003] Oxygen inhalation is one of the most effective ways to prevent and treat altitude sickness and altitude sickness, and is also the most important means to maintain and promote the health of people who live or temporarily live in the plateau. However, existing oxygen supply equipment requires users to manually set and adjust the inhaled oxygen flow rate based on their personal experience or preferences. If there is insufficient understanding of the rational use of oxygen or if accurate and standardized oxygen therapy cannot be performed, the effect of preventing and treating plateau hypoxia cannot be achieved.

[0004] On the one hand, if the oxygen flow rate is set too small, the inhaled oxygen is too little to relieve the symptoms of hypoxia. On the other hand, if the inhaled oxygen flow rate is too large or the oxygen inhalation time is too long, it may cause side effects of excessive oxygen inhalation or even oxygen poisoning, aggravating the damage to the body. Therefore, research on intelligent on-demand oxygen supply technology, which can meet the body's oxygen supply needs while using oxygen to the greatest extent possible, is the key to maintaining health and preventing altitude sickness. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention proposes a system and method for intelligent oxygen supply based on physiological parameters to solve the above technical problems.

[0006] In a first aspect, a system and method for intelligent oxygen supply according to physiological parameters are provided, including: a detection electrode, a detection module, a control module, a proportional solenoid valve, an oxygen absorption module and a flow sensor;

[0007] The detection module is connected to the detection electrodes and is used to detect the heart rate and blood oxygen saturation of the human body;

[0008] The control module receives data from the detection module, determines the optimal oxygen flow rate according to the heart rate and blood oxygen saturation value, and controls the flow rate and flow rate of the proportional solenoid valve;

[0009] The oxygen absorption module is connected to a proportional solenoid valve to supply oxygen to the human body according to a set flow rate;

[0010] The flow sensor is used to monitor the actual oxygen supply flow rate and feed it back to the control module for closed-loop control.

[0011] Furthermore, the detection module includes a PPG sensor for continuously collecting PPG signals of the human body through infrared light and red light sources.

[0012] Furthermore, the control module includes a controller for filtering, peak and valley detection, and cubic spline interpolation processing of the PPG signal to calculate the heart rate and blood oxygen saturation.

[0013] Furthermore, the control module also includes a logic judgment unit, which is used to set the oxygen flow rate according to the values ​​of the heart rate and blood oxygen saturation, and convert the set oxygen flow rate into an opening instruction of the proportional solenoid valve.

[0014] Furthermore, it also includes a PID control unit, which is used to adjust the opening of the proportional solenoid valve in combination with the feedback signal of the flow sensor to achieve precise control of the oxygen flow.

[0015] Furthermore, the values ​​of the heart rate and blood oxygen saturation can be preset into multiple levels, and the oxygen flow rate can be divided into multiple levels according to the values ​​of the multiple levels.

[0016] Furthermore, a timer is included for setting a time interval for re-evaluating and adjusting the oxygen flow rate.

[0017] In a second aspect, a method for intelligent oxygen supply according to physiological parameters is provided, based on a system for intelligent oxygen supply according to physiological parameters as described in any one of the preceding items, comprising the following steps:

[0018] Step S01, using a PPG sensor to continuously collect PPG signals of a human body;

[0019] Step S02: Process the PPG signal to calculate the heart rate and blood oxygen saturation;

[0020] Step S03, determining the optimal oxygen flow rate according to the heart rate and blood oxygen saturation values;

[0021] Step S04, using a PID control algorithm to adjust the opening of the proportional solenoid valve;

[0022] Step S05: re-evaluate the heart rate and blood oxygen saturation at regular intervals, and adjust the oxygen flow rate according to the evaluation results.

[0023] Furthermore, in step S02, the processing of the PPG signal includes baseline removal, peak and valley detection, and cubic spline interpolation steps.

[0024] Furthermore, in step S04, the oxygen flow rate is adjusted based on a comprehensive evaluation of the heart rate and blood oxygen saturation, taking into account individual differences and changes in the condition of the patient.

[0025] The invention adopting the above technical solution has the following advantages:

[0026] The present invention records the human body's photoplethysmography (PPG) signal and calculates the heart rate and blood oxygen saturation value, determines the optimal oxygen flow rate according to the currently measured heart rate and blood oxygen saturation value, and the target oxygen saturation value, and achieves the goal of on-demand oxygen supply by controlling the flow rate and flow rate of the proportional solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0028] Figure 1 This is a system block diagram of intelligent oxygen supply according to physiological parameters of the present invention;

[0029] Figure 2 A flow chart of a method for intelligent oxygen supply according to physiological parameters of the present invention;

[0030] Figure 3 A schematic diagram of a heart rate and blood oxygen saturation detection method in a system and method for intelligent oxygen supply according to physiological parameters of the present invention;

[0031] Figure 4 The present invention is a flow chart of a control algorithm for supplying oxygen on demand in a system and method for intelligent oxygen supply based on physiological parameters. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0033] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should be the common meanings understood by technicians in the field to which the present invention belongs. The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to implement the embodiments of the present disclosure described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. Unless otherwise specified, the term "multiple" means two or more. In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B. The term "and / or" is a description of the association relationship of objects, indicating that there can be three relationships. For example, A and / or B means: A or B, or, A and B. The term "corresponding" can refer to an association relationship or a binding relationship, and A and B correspondingly refer to an association relationship or a binding relationship between A and B.

[0034] like Figure 1 to Figure 4 As shown, a system for intelligent oxygen supply according to physiological parameters of the present invention comprises: a detection electrode, a detection module, a control module, a proportional solenoid valve, an oxygen absorption module and a flow sensor;

[0035] The detection module is connected to the detection electrodes to detect the heart rate and blood oxygen saturation of the human body;

[0036] The control module receives data from the detection module, determines the optimal oxygen flow rate according to the heart rate and blood oxygen saturation value, and controls the flow rate and flow rate of the proportional solenoid valve;

[0037] The oxygen absorption module is connected to the proportional solenoid valve to supply oxygen to the human body according to the set flow rate;

[0038] The flow sensor is used to monitor the actual oxygen supply flow and feed it back to the control module for closed-loop control.

[0039] Specifically, the present invention records the human body's photoplethysmogram (PPG) signal and calculates the heart rate and blood oxygen saturation value, determines the optimal oxygen flow rate according to the currently measured heart rate and blood oxygen saturation value, and the target oxygen saturation value, and achieves the goal of on-demand oxygen supply by controlling the flow rate and flow rate of the proportional solenoid valve.

[0040] In some embodiments, the detection module includes a PPG sensor (earplug-type or finger-clip-type PPG sensor) for continuously collecting PPG signals (photoplethysmography signals) of the human body, and is implemented through infrared light and red light sources.

[0041] In some embodiments, the control module includes a controller, which is electrically connected to the PPG sensor and the proportional solenoid valve, respectively. The controller is used to filter, detect peak and valley values, and perform cubic spline interpolation processing on the PPG signal to calculate the heart rate and blood oxygen saturation.

[0042] In some embodiments, the control module further includes a logic judgment unit for setting the oxygen flow rate according to the values ​​of the heart rate and the blood oxygen saturation, and converting the set oxygen flow rate into an opening instruction of the proportional solenoid valve.

[0043] In some embodiments, the oxygen inhalation module includes an oxygen component, a buffer air bag, a one-way valve and an oxygen mask. The oxygen component is connected to the proportional solenoid valve through a pipeline, and the two ends of the buffer air bag are respectively connected to the oxygen mask and the proportional solenoid valve through pipelines. The one-way valve is installed on the oxygen mask.

[0044] The oxygen assembly includes an oxygen concentrator or a miniature oxygen cylinder. The miniature oxygen cylinder is equipped with a pressure reducing valve. The oxygen concentrator or the miniature oxygen cylinder can be selected according to actual conditions.

[0045] Specifically, when the patient starts to breathe oxygen, the oxygen generated or provided by the oxygen assembly is adjusted to an appropriate pressure through the pressure reducing valve and then enters the proportional solenoid valve. The proportional solenoid valve controls the output of oxygen according to the preset flow parameters, so that it flows smoothly into the buffer airbag. After the buffer airbag further stabilizes the oxygen flow, the oxygen enters the oxygen mask through the one-way valve and is finally inhaled by the patient.

[0046] During the entire process, the PPG sensor continuously monitors the patient's heart rate and blood oxygen saturation, and feeds the data back to the controller so that oxygen inhalation parameters can be adjusted or an alarm can be issued in a timely manner.

[0047] In some embodiments, a PID control unit is also included, which is used to adjust the opening of the proportional solenoid valve in combination with the feedback signal of the flow sensor to achieve precise control of the oxygen flow.

[0048] In some embodiments, the values ​​of heart rate and blood oxygen saturation can be preset to multiple levels, and the oxygen flow rate is divided into multiple levels according to the values ​​of the multiple levels to meet the needs of different physiological states.

[0049] In some embodiments, a timer is further included to set a time interval for re-evaluating and adjusting the oxygen flow rate to ensure the real-time and accuracy of the oxygen supply parameters.

[0050] In other embodiments, a method for performing intelligent oxygen supply according to physiological parameters is provided, and a system for performing intelligent oxygen supply according to physiological parameters based on any one of the above items comprises the following steps:

[0051] Step S01, using a PPG sensor to continuously collect PPG signals of a human body;

[0052] Step S02: Process the PPG signal to calculate the heart rate and blood oxygen saturation;

[0053] Step S03, determining the optimal oxygen flow rate according to the heart rate and blood oxygen saturation values;

[0054] Step S04: Use the PID control algorithm to adjust the opening of the proportional solenoid valve to achieve accurate control of the oxygen flow rate;

[0055] Step S05: re-evaluate the heart rate and blood oxygen saturation at regular intervals, and adjust the oxygen flow rate according to the evaluation results.

[0056] In some embodiments, in step S02, processing of the PPG signal includes baseline removal, peak and valley detection, and cubic spline interpolation steps to accurately calculate the heart rate and blood oxygen saturation.

[0057] In some embodiments, in step S04, the oxygen flow rate is adjusted based on a comprehensive assessment of heart rate and blood oxygen saturation, taking into account individual differences and changes in the patient's condition to ensure the safety and effectiveness of oxygen supply.

[0058] Specifically, 1. The human body PPG signal is continuously collected through an earplug-type or finger-clip PPG sensor, and the sensor light source uses infrared light and red light.

[0059] 2. The controller continuously receives the PPG signal sent back by the sensor and performs signal processing and calculation. Starting from the 10th second after the start of signal acquisition, the controller intercepts the PPG data segment within 10 seconds before the current time point every 1 second, of which the infrared light data segment is S IR , the red light data segment is S RED .

[0060] 3. Process infrared light data segment S IR , calculate the AC component AC of this data segment IR , DC component IR , and calculate the heart rate HR based on this data segment IR .

[0061] (1) For data segment S IR Perform moving average filtering to obtain S IR The baseline-removed component S Detrend and the baseline component S Trend , where the default moving window size is 51.

[0062] (2) Positioning S Detrend The positions of the peak points are Peak and the positions of the valley points are Valley. The total number of peak points is PNum and the total number of valley points is VNum. Among them, the i-th peak point Peak[i] is in SDetrend The index value in the sequence is PIndex[i]; the jth valley point Valley[j] is in S Detrend The index value in the sequence is VIndex[j]. And:

[0063] Peak[i]=S Detrend [PIndex[i]];

[0064] Valley[j]=S Detrend [VIndex[j]];

[0065] Among them, i∈[0,PNum-1], j∈[0,VNum-1].

[0066] (3) The cubic spline interpolation method is used to interpolate the peak sequence and valley sequence respectively, so that each peak point and each valley point are connected into a smooth curve, where the peak point curve is L Peak , the valley point curve is L Valley .

[0067] (4) Locate the original data segment S IR Valley Orig :

[0068] Valley Orig [j]=Valley[j]+S Trend [VIndex[j]];

[0069] Among them, j∈[0,V Num-1].

[0070] (5) Using cubic spline interpolation, in LValley Orig Interpolation in the sequence, so that LValley Orig The sequence is connected into a smooth curve LValley Orig .

[0071] (6) Calculate the data segments S separately IR AC component IR , DC component IR :

[0072]

[0073]

[0074] in, For curve L Peak The mean of all points on ; For curve LV alley The mean of all points on ; For curve L ValleyOrig The mean of all points on .

[0075] (7) Calculate the heart rate based on the peak point Peak IRPeak ; Calculate the heart rate based on the valley point as HR IRValley Finally, HR IRPeak With HR IRValley The mean of IR The calculation results are:

[0076]

[0077]

[0078] HR IR =(HR IRPeak +HR IRValley ) / 2;

[0079] 4. Processing red light data segment S RED , calculate the AC component AC of this data segment RED , DC component RED , and calculate the heart rate HR based on this data segment RED Data segment S RED Treatment methods and AC RED 、DC RED , HR RED The calculation method of S is the same as that in step 3 IR Processing and AC IR 、DC IR , HR IR The calculation method is the same.

[0080] 5. According to AC RED 、DC RED , AC IR 、DC IR Calculate blood oxygen saturation SPO2:

[0081] SPO2=A*R 2 +B*R+C;

[0082] Where R = (AC RED / DC RED ) / (AC IR / DC IR ); the values ​​of coefficients A, B, and C are determined by experimental calibration.

[0083] 6. According to HR IR and HR RED Calculate heart rate HR:

[0084] HR=(HRIR +HR RED ) / 2

[0085] 7. Set the oxygen flow rate according to the calculated heart rate HR, blood oxygen saturation value SPO2 and oxygen saturation threshold.

[0086] When HR<110min -1 hour:

[0087] Flow = f1(SPO2);

[0088] When HR≥110min -1 hour:

[0089] Flow = f2(SPO2);

[0090] in:

[0091]

[0092]

[0093] 8. According to the set oxygen flow rate benchmark, combined with the flow sensor, use the PID algorithm to adjust the opening of the proportional solenoid valve. When the oxygen flow rate is set to 0, close the proportional solenoid valve.

[0094] 9. When the oxygen flow starts to output, set the timer to T SET , and start the countdown. SET The value range is 0.5 to 1 minute. When the timer time = 0, the countdown ends, and the controller re-sets the oxygen flow rate according to the calculated heart rate and blood oxygen saturation value and oxygen saturation threshold.

[0095] Specifically, compared with the current oxygen supply equipment that relies on manual adjustment of oxygen flow, the present invention can not only adjust and optimize the oxygen flow according to changes in human physiological information, but also prevent the problem of insufficient oxygen supply or excessive oxygen absorption caused by improper manual adjustment of oxygen flow.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A system for intelligent oxygen supply based on physiological parameters, characterized in that: include: Detection electrodes, detection modules, control modules, proportional solenoid valves, oxygen absorption modules and flow sensors; The detection module is connected to the detection electrodes and is used to detect the heart rate and blood oxygen saturation of the human body; The control module receives data from the detection module, determines the optimal oxygen flow rate according to the heart rate and blood oxygen saturation value, and controls the flow rate and flow rate of the proportional solenoid valve; The oxygen absorption module is connected to a proportional solenoid valve to supply oxygen to the human body according to a set flow rate; The flow sensor is used to monitor the actual oxygen supply flow rate and feed it back to the control module for closed-loop control.

2. The system of claim 1, wherein: The detection module includes a PPG sensor for continuously collecting PPG signals of the human body through infrared light and red light sources.

3. The system of claim 1, wherein: The control module includes a controller for filtering, peak and valley detection, and cubic spline interpolation processing of the PPG signal to calculate the heart rate and blood oxygen saturation.

4. The system of claim 3, wherein: The control module also includes a logic judgment unit, which is used to set the oxygen flow rate according to the values ​​of the heart rate and the blood oxygen saturation, and convert the set oxygen flow rate into an opening instruction of the proportional solenoid valve.

5. The system of claim 1, wherein: It also includes a PID control unit, which is used to adjust the opening of the proportional solenoid valve in combination with the feedback signal of the flow sensor to achieve precise control of the oxygen flow.

6. The system of claim 1, wherein: The values ​​of the heart rate and blood oxygen saturation can be preset into multiple levels, and the oxygen flow rate is divided into multiple levels according to the values ​​of the multiple levels.

7. The system of claim 1, wherein: Also included is a timer for setting intervals at which oxygen flow should be reassessed and adjusted.

8. A method for intelligent oxygen supply based on physiological parameters, characterized in that: A system for intelligent oxygen supply according to physiological parameters according to any one of claims 1 to 7 comprises the following steps: Step S01, using a PPG sensor to continuously collect PPG signals of a human body; Step S02: Process the PPG signal to calculate the heart rate and blood oxygen saturation; Step S03, determining the optimal oxygen flow rate according to the heart rate and blood oxygen saturation values; Step S04, using a PID control algorithm to adjust the opening of the proportional solenoid valve; Step S05: re-evaluate the heart rate and blood oxygen saturation at regular intervals, and adjust the oxygen flow rate according to the evaluation results.

9. The method according to claim 8, characterized in that: In step S02, the processing of the PPG signal includes baseline removal, peak and valley detection, and cubic spline interpolation steps.

10. The method according to claim 8, characterized in that: In step S04, the oxygen flow rate is adjusted based on a comprehensive evaluation of the heart rate and blood oxygen saturation, taking into account individual differences and changes in the condition of the patient.

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