CN113101478A - Pulse type oxygen supply control device, method and system based on feedback - Google Patents
Pulse type oxygen supply control device, method and system based on feedback Download PDFInfo
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- CN113101478A CN113101478A CN202110308588.7A CN202110308588A CN113101478A CN 113101478 A CN113101478 A CN 113101478A CN 202110308588 A CN202110308588 A CN 202110308588A CN 113101478 A CN113101478 A CN 113101478A
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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
- A61M2230/00—Measuring parameters of the user
- A61M2230/20—Blood composition characteristics
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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 pulse type oxygen supply control device, method and system based on feedback, which can realize the collection of pulse waves and the accurate calculation of the blood oxygen saturation, thereby realizing the feedback control to output proper oxygen concentration, simultaneously synchronously extracting double respiration signals by the pulse waves and the pressure of a respiration gas circuit, opening an electromagnetic valve during inspiration, closing the electromagnetic valve during expiration, realizing the pulse type oxygen supply function, improving the reliability of the system, reducing the risk to patients during clinical use, improving the adaptivity of oxygen outlet concentration to a certain extent, and saving the loss of oxygen.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a pulse type oxygen supply control method and system based on feedback.
Background
Oxygen is a substance essential for human activities and is an essential element of human life. Research shows that in the metabolism process of human body, energy is generated in the oxidation process after oxygen is combined with various nutrient substances, so that oxygen is an important guarantee for the life activities of human body.
At present, the medical oxygen generation mainly adopts a PSA and VPSA method, generally adopts a double-adsorption-tower type structure, circularly realizes the adsorption and desorption processes, continuously separates nitrogen in air, and stores oxygen into a gas storage tank. The finger-clipped oximeter feeds back the real-time blood oxygen saturation value of a patient to the main control unit, the main control unit adjusts and outputs proper oxygen concentration and flow, and the electromagnetic valve is continuously opened in a continuous oxygen supply mode; and in the pulse oxygen supply mode, the electromagnetic valve is opened or closed according to the control signal to control the oxygen output.
In the prior art, the separation of nitrogen and oxygen is basically realized, and the control of oxygen output concentration can be realized. The oximeter is integrated in a small oxygen generator, and the oxygen output concentration is adjusted according to the value of the blood oxygen saturation, so that the continuous ventilation function is realized, and the respiration of a patient cannot be well conformed; the oxygen generation system with the pulse oxygen supply function mostly controls the on-off of the electromagnetic valve according to the positive and negative pressure in the air passage or the concentration of carbon dioxide, corresponding oxygen outlet concentration control is rarely given according to the real situation of the blood oxygen saturation of a patient, the oxygen outlet concentration needs to be manually set, and meanwhile, the breathing is identified by simply using the trend of the air passage pressure and the carbon dioxide concentration, so that some errors possibly exist.
Disclosure of Invention
Therefore, in order to overcome the defect that the existing oxygen supply control method cannot supply oxygen adaptively according to the actual condition of the patient, the invention provides a pulse type oxygen supply control method and system based on feedback, which can realize the acquisition of pulse waves and the accurate calculation of the blood oxygen saturation and respiratory signals, and perform pulse type adaptive oxygen supply for the patient based on the feedback of the pulse waves and the accurate calculation of the blood oxygen saturation and respiratory signals.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a feedback-based pulse oxygen supply control device, including a pulse oxygen acquisition unit, a respiratory airway pressure acquisition unit, a main control unit, and an oxygen generation device, wherein:
the pulse oxygen acquisition unit comprises a photoelectric driving circuit and a first signal processing unit, the photoelectric driving circuit drives the finger-clamped probe to alternately work to acquire two-path pulse wave signals, and the first signal processing unit performs adjustable gain amplification on the two-path pulse wave signals to obtain two-path pulse wave signals with high signal-to-noise ratio;
the respiratory airway pressure acquisition unit comprises a pressure sensor and a second signal processing unit, wherein the pressure sensor acquires an airway pressure signal, and the second signal processing unit performs instrument amplification sampling on the pressure signal to obtain a respiratory waveform signal;
an oxygen plant comprising: the device comprises a four-way valve, a filter, an air compressor, a pressure reducer, an adsorption tower, an electromagnetic valve, a one-way valve and an oxygen storage tank, wherein the air compressor extracts air filtered by the filter to a set pressure value, the air enters the adsorption tower through the four-way valve for adsorption, after nitrogen is adsorbed, the one-way valve is opened to enable the oxygen to enter the air storage tank for storage, the electromagnetic valve is used for controlling oxygen concentration and oxygen flow, and the pressure reducer is used for releasing the nitrogen;
the main control unit is used for firstly controlling the system to perform self-checking after the system is powered on, then controlling a compressor of the oxygen generation device to extract air to enter the adsorption tower for cyclic adsorption and desorption, separating oxygen and storing the oxygen in the oxygen storage tank, then controlling the pulse oxygen acquisition unit and the respiratory airway pressure acquisition unit to start working, extracting a blood oxygen saturation signal in the two paths of pulse wave signals, and processing the one path of pulse wave signals to obtain a respiratory signal synchronously with airway pressure; according to the oxyhemoglobin saturation signal and the respiration signal, the oxygen generation device is adjusted in a feedback mode to provide adaptive oxygen concentration and/or oxygen flow, when the respiration signal is identified to be in a wave crest, the electromagnetic valve is opened to supply oxygen, and when the respiration signal is identified to be in a wave trough, the electromagnetic valve is closed.
Preferably, the adjusting process of the oxygen concentration includes: comparing the patient blood oxygen saturation monitored by the pulse oxygen acquisition unit with a preset normal blood oxygen saturation, if the patient blood oxygen saturation is lower than the normal value, increasing the output of a compressor, raising the pressure value in an adsorption tower, improving the nitrogen-oxygen adsorption ratio of a molecular sieve in the pressure swing adsorption process, better separating nitrogen and oxygen, and improving the oxygen output concentration; if the pressure value is higher than the normal value, the output of the compressor is reduced, the pressure value in the adsorption tower is reduced, the nitrogen-oxygen adsorption ratio of the molecular sieve in the pressure swing adsorption process is reduced, the nitrogen-oxygen separation is incomplete, and the oxygen outlet concentration is reduced.
Preferably, the adjustment of the oxygen flow depends on the opening frequency of the electromagnetic valve, the intermittent opening and closing of the electromagnetic valve are adjusted in the oxygen supply process through a set oxygen flow value, and if the actual flow is lower than the preset flow, the opening duty ratio of the electromagnetic valve is increased; and if the actual flow is higher than the preset flow, reducing the opening duty ratio of the electromagnetic valve.
Preferably, the feedback-based pulse oxygen supply control device further includes: and the power supply unit is used for supplying power to the pulse oxygen acquisition unit, the breathing airway pressure acquisition unit and the main control unit, wherein the pulse oxygen acquisition unit and the main control unit are integrated on one board card.
In a second aspect, an embodiment of the present invention provides a feedback-based pulse oxygen supply control method, including: acquiring a two-path pulse wave signal and a respiratory airway pressure signal of a patient; acquiring the blood oxygen saturation according to the two paths of pulse wave signals, processing one path of pulse wave signal, and then synchronously acquiring a respiratory signal with the airway pressure; and providing an adaptive oxygen concentration and/or oxygen flow according to the blood oxygen saturation signal and the respiration signal, and supplying oxygen to the patient when the respiration waveform signal is identified to be an inspiration process.
Preferably, the process of providing an adapted oxygen concentration and/or oxygen flow rate according to a blood oxygen saturation signal, a respiration signal, comprises:
and comparing the real-time monitored blood oxygen saturation of the patient with the preset normal blood oxygen saturation, if the blood oxygen saturation is lower than a normal value, increasing the oxygen concentration or the oxygen flow, and if the blood oxygen saturation is higher than the normal value, reducing the oxygen concentration and/or the oxygen flow.
Preferably, the process of obtaining the blood oxygen saturation according to the two-path pulse wave signal, and obtaining the respiratory signal synchronously with the airway pressure after processing the one-path pulse wave signal includes:
calculating a corresponding blood oxygen saturation value based on the two-path pulse wave signals according to the Lambert beer law;
and decomposing the one-path pulse wave signal after the low-pass filtering by adopting an EMD algorithm to obtain a plurality of components, reconstructing the component with higher correlation according to the frequency of the respiratory signal to obtain a rough respiratory signal, and synchronously acquiring the respiratory signal with the airway pressure.
In a third aspect, a feedback-based pulse oxygen supply control system provided in an embodiment of the present invention includes:
the patient detection signal acquisition module is used for acquiring a two-path pulse wave signal and a respiratory airway pressure signal of a patient;
the pulse wave signal processing module is used for acquiring the blood oxygen saturation according to the two paths of pulse wave signals, and acquiring a respiratory signal synchronously with the airway pressure after processing one path of pulse wave signal;
and the oxygen supply control module is used for providing adaptive oxygen concentration and/or oxygen flow according to the blood oxygen saturation signal and the respiratory signal and supplying oxygen to the patient when recognizing that the respiratory waveform signal is an inspiration process.
In a fourth aspect, an embodiment of the present invention provides a control terminal, including: the apparatus includes at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to cause the at least one processor to perform the method according to the second aspect of the embodiments of the present invention.
In a fifth aspect, the present invention provides a computer-readable storage medium, where computer instructions are stored, and the computer instructions are used to make a computer execute the method according to the second aspect.
The technical scheme of the invention has the following advantages:
1. the pulse type oxygen supply control device, method and system based on feedback provided by the embodiment of the invention can realize the collection of pulse waves and the accurate calculation of the blood oxygen saturation, thereby realizing the feedback control to output proper oxygen concentration, simultaneously synchronously extracting double respiration signals from the pulse waves and the pressure of a respiration gas circuit, opening the electromagnetic valve during inspiration, closing the electromagnetic valve during expiration, realizing the pulse type oxygen supply function, improving the reliability of the system, reducing the risk to patients during clinical use, improving the adaptivity of oxygen outlet concentration to a certain extent, and saving the loss of oxygen.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a block diagram of an example of a feedback-based pulse oxygen supply control apparatus provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a respiratory waveform signal provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram of an oxygen plant according to an embodiment of the present invention;
fig. 4 is a flowchart of an example of a video anomaly detection method of an online device provided in an embodiment of the present invention;
fig. 5 is a flowchart illustrating a main control unit controlling the operation of the entire apparatus according to an embodiment of the present invention;
fig. 6 is a flowchart of a specific example of a feedback-based pulse oxygen supply control method provided in an embodiment of the present invention;
fig. 7 is a block diagram of an example of a feedback-based pulse oxygen control system according to an embodiment of the present invention;
fig. 8 is a composition diagram of a specific example of the control terminal according to the embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment of the invention provides a pulse type oxygen supply control device based on feedback, which comprises a pulse oxygen acquisition unit, a respiratory airway pressure acquisition unit, a main control unit and an oxygen generation device, as shown in figure 1, wherein:
the pulse oxygen acquisition unit comprises a photoelectric driving circuit and a first signal processing unit, the photoelectric driving circuit drives the finger-clipped probe to alternately work to acquire double-path pulse wave signals, and the first signal processing unit performs adjustable gain amplification on the double-path pulse wave signals to obtain the double-path pulse wave signals with high signal-to-noise ratio. In a specific embodiment, the pulse oxygen acquisition unit photoelectric driving circuit adopts an H-bridge constant current source driving mode, and can control and adjust the size of a constant current source to change the luminous intensity; the first signal processing unit comprises a preceding stage differential amplification unit, a subtracter and a subsequent stage adjustable gain amplification unit, and can control and adjust the voltage of the input end of the subtracter to subtract a corresponding direct current component; the gain resistance in the access circuit is changed through gear switching of the analog switch, so that the amplification factor is changed, and pulse wave signals with high signal-to-noise ratio can be acquired under different conditions; the 24-bit high-precision external AD acquisition is carried out, the data processing is carried out by entering the MCU, the accurate calculation of the blood oxygen saturation is realized, and a probe interface is reserved for connecting a human body for measurement.
The respiratory airway pressure acquisition unit comprises a pressure sensor and a second signal processing unit, wherein the pressure sensor acquires an airway pressure signal, and the second signal processing unit performs instrument amplification sampling on the pressure signal to obtain a respiratory waveform signal, as shown in fig. 2;
an oxygen generation plant, as shown in fig. 3, comprising: the method comprises the following steps: four-way valve, filter, air compressor, pressure reducer, adsorption tower, solenoid valve, check valve and oxygen storage tank, air compressor extraction air to the set pressure value after the filter filters to adsorb in getting into the adsorption tower through the four-way valve, nitrogen gas is adsorbed the back, opens the check valve and makes oxygen get into to store in the gas holder, comes control oxygen concentration and oxygen flow through the solenoid valve, and the pressure reducer is used for releasing nitrogen gas.
The main control unit is used for firstly controlling the system to perform self-checking after the system is powered on, then controlling a compressor of the oxygen generation device to extract air to enter the adsorption tower for cyclic adsorption and desorption, separating oxygen and storing the oxygen in the oxygen storage tank, then controlling the pulse oxygen acquisition unit and the respiratory airway pressure acquisition unit to start working, extracting a blood oxygen saturation signal in the two paths of pulse wave signals, and processing the one path of pulse wave signals to obtain a respiratory signal synchronously with airway pressure; according to the oxyhemoglobin saturation signal and the respiration signal, the oxygen generation device is adjusted in a feedback mode to provide adaptive oxygen concentration and/or oxygen flow, when the respiration signal is identified to be in a wave crest, the electromagnetic valve is opened to supply oxygen, and when the respiration signal is identified to be in a wave trough, the electromagnetic valve is closed. The specific implementation process is shown in fig. 4.
In the embodiment of the invention, the process for adjusting the oxygen concentration comprises the following steps: comparing the patient blood oxygen saturation monitored by the pulse oxygen acquisition unit with a preset normal blood oxygen saturation, if the patient blood oxygen saturation is lower than the normal value, increasing the output of a compressor, raising the pressure value in an adsorption tower, improving the nitrogen-oxygen adsorption ratio of a molecular sieve in the pressure swing adsorption process, better separating nitrogen and oxygen, and improving the oxygen output concentration; if the pressure value is higher than the normal value, the output of the compressor is reduced, the pressure value in the adsorption tower is reduced, the nitrogen-oxygen adsorption ratio of the molecular sieve in the pressure swing adsorption process is reduced, the nitrogen-oxygen separation is incomplete, and the oxygen outlet concentration is reduced.
In the embodiment of the invention, the adjustment of the oxygen flow depends on the opening frequency of the electromagnetic valve, the intermittent opening and closing of the electromagnetic valve are adjusted in the oxygen supply process through the set oxygen flow value, and if the actual flow is lower than the preset flow, the opening duty ratio of the electromagnetic valve is improved; and if the actual flow is higher than the preset flow, reducing the opening duty ratio of the electromagnetic valve.
Pulse type oxygen suppliment controlling means based on feedback can insert the commercial power and supply power among the practical application, also can be for its power supply through setting up the power supply unit, does reasonable setting according to actual need. In one embodiment, the power is supplied by a power supply unit, the frame of the particular device, as shown in FIG. 5.
The pulse type oxygen supply control device based on feedback provided by the embodiment of the invention can realize the collection of pulse waves and the accurate calculation of the blood oxygen saturation, thereby realizing the function of pulse type oxygen supply by feedback control and outputting proper oxygen concentration, synchronously extracting double respiration signals from the pulse waves and the pressure of a respiration gas circuit, opening the electromagnetic valve during inspiration and closing the electromagnetic valve during expiration, improving the reliability of the system, reducing the risk to patients in the clinical use process, improving the adaptivity of oxygen output concentration to a certain extent and saving the loss of oxygen. Actually, the pulse oxygen acquisition unit and the main control unit are integrated on one board card, so that the overall size of the device is reduced.
Example 2
The embodiment of the invention provides a feedback-based pulse type oxygen supply control method, which can be executed on a control terminal or an MCU chip, and as shown in FIG. 6, the method comprises the following steps:
and step S1, acquiring two-way pulse wave signals and respiratory airway pressure signals of the patient.
In the embodiment of the invention, the pulse oxygen acquisition unit and the respiratory airway pressure acquisition unit in embodiment 1 can be used for respectively acquiring the two-path pulse wave signal and the respiratory airway pressure signal of the patient, and the specific implementation process is not particularly limited.
And step S2, obtaining the blood oxygen saturation according to the two paths of pulse wave signals, processing one path of pulse wave signal, and then obtaining a respiratory signal synchronously with the airway pressure.
According to the embodiment of the invention, a pulse wave signal of two paths is acquired by a pulse oxygen acquisition unit, and a corresponding blood oxygen saturation value is accurately calculated according to the Lambert beer law; and decomposing the one-path pulse wave signal after the low-pass filtering by adopting an EMD algorithm to obtain a plurality of components, reconstructing the component with higher correlation according to the frequency of the respiratory signal to obtain a rough respiratory signal, and synchronously acquiring the respiratory signal with the airway pressure.
In one embodiment, the implementation process of processing the pulse wave by using the EMD algorithm includes:
finding out pulse wave form hi-1(t) maximum, minimum;
fitting envelopes (maximum envelope and minimum envelope) by a cubic spline interpolation method;
thirdly, averaging the two extreme value curves to obtain an average envelope, and calculating the average value of the envelope;
subtracting the average envelope line from the pulse wave signal to obtain a middle signal;
judging whether the middle is an intrinsic mode function IMF (the envelope mean value is approximately equal to 0), if so, determining one of the intrinsic mode functions IMF; if not, repeating the third step and the fourth step until yes;
after obtaining IMF signal, subtracting IMF from original waveform as new original signal, and continuing the third step;
seventhly, ending when the residual signal is a constant function or a monotone function;
and the components related to the frequency are superposed and reconstructed to obtain a rough breathing signal.
And step S3, providing adaptive oxygen concentration and/or oxygen flow according to the blood oxygen saturation signal and the respiration signal, and supplying oxygen to the patient when the respiration waveform signal is identified to be an inspiration process.
As shown in fig. 2, according to the characteristics of human breathing, negative pressure exists in the air passage during inspiration, positive pressure exists in the air passage during expiration, can evaluate physiological respiration signals of human bodies according to the waveform of pressure, synchronizes double respiration signals, supplies air when inhaling, stops supplying air when exhaling, in practical application, the pulse wave signals of the human body are collected in real time, the corresponding blood oxygen saturation is calculated, the respiratory signals of the human body are extracted according to the pulse wave signals and are cooperated with an airway pressure identification mode, if the blood oxygen saturation is too low, the oxygen generation system is fed back and regulated to provide comfortable oxygen concentration and/or oxygen flow, particularly if the control unit is connected with an oxygen storage device (such as an oxygen storage tank) with fixed oxygen concentration, the oxygen flow is controlled to be increased, if the control unit is connected with an oxygen generator, the oxygen output concentration of the oxygen generator can be controlled to provide adaptive oxygen supply for patients.
In response to the above method, an embodiment of the present invention provides a pulse type oxygen supply control system based on feedback, as shown in fig. 7, including:
the patient detection signal acquisition module 1 is used for acquiring a two-path pulse wave signal and a respiratory airway pressure signal of a patient; this module executes the method described in step S1 in embodiment 1, and is not described herein again.
The pulse wave signal processing module 2 is used for obtaining the blood oxygen saturation according to the two paths of pulse wave signals, and processing one path of pulse wave signals and then synchronizing with the airway pressure to obtain a respiratory signal; this module executes the method described in step S2 in embodiment 1, and is not described herein again.
And the oxygen supply control module 3 is used for providing adaptive oxygen concentration and/or oxygen flow according to the blood oxygen saturation signal and the respiration signal and supplying oxygen to the patient when recognizing that the respiration waveform signal is an inspiration process. This module executes the method described in step S3 in embodiment 1, and is not described herein again.
The embodiment of the invention provides a pulse type oxygen supply control method and system based on feedback, which can realize the collection of pulse waves and the accurate calculation of the blood oxygen saturation, thereby realizing the feedback control to output proper oxygen concentration, simultaneously synchronously extracting double respiration signals from the pulse waves and the pressure of a respiration gas circuit, opening an electromagnetic valve during inspiration, and closing the electromagnetic valve during expiration, realizing the pulse type oxygen supply function, improving the reliability of the system, reducing the risk to patients during clinical use, improving the adaptivity of oxygen output concentration to a certain extent, and saving the oxygen loss.
Example 3
An embodiment of the present invention provides a control terminal, as shown in fig. 8, including: at least one processor 401, such as a CPU (Central Processing Unit), at least one communication interface 403, memory 404, and at least one communication bus 402. Wherein a communication bus 402 is used to enable connective communication between these components. The communication interface 403 may include a Display (Display) and a Keyboard (Keyboard), and the optional communication interface 403 may also include a standard wired interface and a standard wireless interface. The Memory 404 may be a RAM (random Access Memory) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The memory 404 may optionally be at least one memory device located remotely from the processor 401. Wherein the processor 401 may perform the method described in embodiment 2. A set of program codes is stored in the memory 404 and the processor 401 calls the program codes stored in the memory 404 for executing the method described in embodiment 2.
The communication bus 402 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The communication bus 402 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one line is shown in FIG. 8, but this does not represent only one bus or one type of bus.
The memory 404 may include a volatile memory (RAM), such as a random-access memory (RAM); the memory may also include a non-volatile memory (english: non-volatile memory), such as a flash memory (english: flash memory), a hard disk (english: hard disk drive, abbreviated: HDD) or a solid-state drive (english: SSD); the memory 404 may also comprise a combination of memories of the kind described above. The processor 401 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.
The processor 401 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof. Optionally, the memory 404 is also used to store program instructions. The processor 401 may call program instructions to implement the method of embodiment 2 as described herein.
An embodiment of the present invention further provides a computer-readable storage medium, where computer-executable instructions are stored on the computer-readable storage medium, and the computer-executable instructions can execute the method of embodiment 2. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid-State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. The utility model provides a pulsed oxygen suppliment controlling means based on feedback, includes pulse oxygen acquisition unit, respiratory airway pressure acquisition unit, main control unit, oxygenerator, wherein:
the pulse oxygen acquisition unit comprises a photoelectric driving circuit and a first signal processing unit, the photoelectric driving circuit drives the finger-clamped probe to alternately work to acquire two-path pulse wave signals, and the first signal processing unit performs adjustable gain amplification on the two-path pulse wave signals to obtain two-path pulse wave signals with high signal-to-noise ratio;
the respiratory airway pressure acquisition unit comprises a pressure sensor and a second signal processing unit, wherein the pressure sensor acquires an airway pressure signal, and the second signal processing unit performs instrument amplification sampling on the pressure signal to obtain a respiratory waveform signal;
an oxygen plant comprising: the device comprises a four-way valve, a filter, an air compressor, a pressure reducer, an adsorption tower, an electromagnetic valve, a one-way valve and an oxygen storage tank, wherein the air compressor extracts air filtered by the filter to a set pressure value, the air enters the adsorption tower through the four-way valve for adsorption, after nitrogen is adsorbed, the one-way valve is opened to enable the oxygen to enter the air storage tank for storage, the electromagnetic valve is used for controlling oxygen concentration and oxygen flow, and the pressure reducer is used for releasing the nitrogen;
the main control unit is used for firstly controlling the system to perform self-checking after the system is powered on, then controlling a compressor of the oxygen generation device to extract air to enter the adsorption tower for cyclic adsorption and desorption, separating oxygen and storing the oxygen in the oxygen storage tank, then controlling the pulse oxygen acquisition unit and the respiratory airway pressure acquisition unit to start working, extracting a blood oxygen saturation signal in the two paths of pulse wave signals, and processing the one path of pulse wave signals to obtain a respiratory signal synchronously with airway pressure; according to the oxyhemoglobin saturation signal and the respiration signal, the oxygen generation device is adjusted in a feedback mode to provide adaptive oxygen concentration and/or oxygen flow, when the respiration signal is identified to be in a wave crest, the electromagnetic valve is opened to supply oxygen, and when the respiration signal is identified to be in a wave trough, the electromagnetic valve is closed.
2. The feedback-based pulsed oxygen supply control device of claim 1, wherein the adjustment of the oxygen concentration comprises: comparing the patient blood oxygen saturation monitored by the pulse oxygen acquisition unit with a preset normal blood oxygen saturation, if the patient blood oxygen saturation is lower than the normal value, increasing the output of a compressor, raising the pressure value in an adsorption tower, improving the nitrogen-oxygen adsorption ratio of a molecular sieve in the pressure swing adsorption process, better separating nitrogen and oxygen, and improving the oxygen output concentration; if the pressure value is higher than the normal value, the output of the compressor is reduced, the pressure value in the adsorption tower is reduced, the nitrogen-oxygen adsorption ratio of the molecular sieve in the pressure swing adsorption process is reduced, the nitrogen-oxygen separation is incomplete, and the oxygen outlet concentration is reduced.
3. The feedback-based pulse type oxygen supply control device as claimed in claim 2, wherein the adjustment of the oxygen flow depends on the on-frequency of the solenoid valve, the intermittent on-off of the solenoid valve is adjusted through the set oxygen flow value during the oxygen supply process, and the on-duty ratio of the solenoid valve is increased if the actual flow is lower than the preset flow; and if the actual flow is higher than the preset flow, reducing the opening duty ratio of the electromagnetic valve.
4. The feedback-based pulsed oxygen supply control device of claim 1, further comprising: and the power supply unit is used for supplying power to the pulse oxygen acquisition unit, the breathing airway pressure acquisition unit and the main control unit, wherein the pulse oxygen acquisition unit and the main control unit are integrated on one board card.
5. A pulse type oxygen supply control method based on feedback is characterized by comprising the following steps:
acquiring a two-path pulse wave signal and a respiratory airway pressure signal of a patient;
acquiring the blood oxygen saturation according to the two paths of pulse wave signals, processing one path of pulse wave signal, and then synchronously acquiring a respiratory signal with the airway pressure;
and providing an adaptive oxygen concentration and/or oxygen flow according to the blood oxygen saturation signal and the respiration signal, and supplying oxygen to the patient when the respiration waveform signal is identified to be an inspiration process.
6. The feedback-based pulsed oxygenation control method of claim 5, wherein the process of providing an adapted oxygen concentration and/or oxygen flow from a blood oxygen saturation signal, a respiratory signal, comprises:
and comparing the real-time monitored blood oxygen saturation of the patient with the preset normal blood oxygen saturation, if the blood oxygen saturation is lower than a normal value, increasing the oxygen concentration or the oxygen flow, and if the blood oxygen saturation is higher than the normal value, reducing the oxygen concentration and/or the oxygen flow.
7. The feedback-based pulse oxygen supply control method according to claim 5, wherein the process of obtaining the blood oxygen saturation level according to the two-way pulse wave signals, and obtaining the respiratory signal synchronously with the airway pressure after processing the one-way pulse wave signal comprises:
calculating a corresponding blood oxygen saturation value based on the two-path pulse wave signals according to the Lambert beer law;
and decomposing the one-path pulse wave signal after the low-pass filtering by adopting an EMD algorithm to obtain a plurality of components, reconstructing the component with higher correlation according to the frequency of the respiratory signal to obtain a rough respiratory signal, and synchronously acquiring the respiratory signal with the airway pressure.
8. A feedback-based pulsed oxygen supply control system comprising:
the patient detection signal acquisition module is used for acquiring a two-path pulse wave signal and a respiratory airway pressure signal of a patient;
the pulse wave signal processing module is used for acquiring the blood oxygen saturation according to the two paths of pulse wave signals, and acquiring a respiratory signal synchronously with the airway pressure after processing one path of pulse wave signal;
and the oxygen supply control module is used for providing adaptive oxygen concentration and/or oxygen flow according to the blood oxygen saturation signal and the respiratory signal and supplying oxygen to the patient when recognizing that the respiratory waveform signal is an inspiration process.
9. A control terminal, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the feedback-based pulsed oxygen supply control method of any of claims 5-7.
10. A computer readable storage medium storing computer instructions for causing a computer to execute any one of the feedback-based pulsed oxygen supply control methods of 5-7.
Priority Applications (1)
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| US20200157090A1 (en) * | 2014-11-20 | 2020-05-21 | Koninklijke Philips N.V. | Non-invasive ventilation with high frequency oscillations |
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| JP2002065856A (en) * | 2000-08-29 | 2002-03-05 | Fujisawa Pharmaceut Co Ltd | Concentrated oxygen feeder |
| US20200157090A1 (en) * | 2014-11-20 | 2020-05-21 | Koninklijke Philips N.V. | Non-invasive ventilation with high frequency oscillations |
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| CN108635644A (en) * | 2018-04-04 | 2018-10-12 | 张同合 | A kind of oxygen inhalation instrument that can monitor blood oxygen saturation and pulse |
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