CN114904115B - Automatic control method and equipment for oxygen concentration of respiratory support equipment - Google Patents
Automatic control method and equipment for oxygen concentration of respiratory support equipment Download PDFInfo
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- CN114904115B CN114904115B CN202210619390.5A CN202210619390A CN114904115B CN 114904115 B CN114904115 B CN 114904115B CN 202210619390 A CN202210619390 A CN 202210619390A CN 114904115 B CN114904115 B CN 114904115B
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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
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/104—Preparation of respiratory gases or vapours specially adapted for anaesthetics
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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
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/12—Preparation of respiratory gases or vapours by mixing different gases
- A61M16/122—Preparation of respiratory gases or vapours by mixing different gases with dilution
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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
- A61M16/20—Valves specially adapted to medical respiratory devices
- A61M16/201—Controlled valves
- A61M16/202—Controlled valves electrically actuated
- A61M16/203—Proportional
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The application discloses an automatic control method and equipment for oxygen concentration of respiratory support equipment, which are used for obtaining preset target flow and target oxygen concentration; judging whether the preset target oxygen concentration is larger than a system set value, if so, setting the driving voltage of the proportional valve to be an empirical voltage value, and if not, keeping the proportional valve in a closed state; judging whether the oxygen concentration rises, if the oxygen concentration does not change, increasing the single adjustment amplitude of the driving voltage of the proportional valve; if the oxygen concentration rises, the proportional valve driving voltage is regulated by adopting a PID control method, and the output gas concentration after the oxygen concentration rises is controlled to reach the preset target concentration. According to the method, the driving voltage of the proportional valve is set to be an empirical voltage value to control the oxygen to enter, so that the oxygen concentration of the breathing support equipment can be controlled without using a pressure reducing valve; the proportion valve driving voltage is regulated by the PID control method, so that the control step of the breathing equipment on the oxygen concentration of the gas is simplified, and the control efficiency of the oxygen concentration is improved.
Description
Technical Field
The invention belongs to the field of breathing equipment, and particularly relates to an oxygen concentration automatic control method and equipment for breathing support equipment.
Background
In respiratory support apparatus, the output of oxygen is typically increased in order to raise the patient's blood oxygen level. The high-pressure oxygen source with the pressure range of 276-600 kPa is directly connected, a pressure reducing valve is added to an oxygen source branch, the oxygen source pressure is reduced to a fixed pressure, then a proportional valve and a flow sensor are connected, and after the target oxygen concentration is set, the opening degree of the proportional valve is adjusted through feedback of the oxygen concentration sensor and the flow sensor. This method uses a large number of sensors and requires the use of a pressure reducing valve.
Disclosure of Invention
In order to overcome the technical defects, the application provides an automatic control method for the oxygen concentration of the breathing support device, which can control the oxygen concentration of the breathing support device and reduce the cost of the breathing support device.
In order to solve the problems, the invention is realized according to the following technical scheme:
in a first aspect, the present invention provides a method for automatically controlling oxygen concentration in a respiratory support apparatus, including the steps of:
acquiring a preset target flow and a preset target oxygen concentration;
judging whether the preset target oxygen concentration is larger than a system set value, if so, setting the driving voltage of the proportional valve to be an empirical voltage value, and if not, keeping the proportional valve in a closed state;
judging whether the oxygen concentration rises, if the oxygen concentration does not change, increasing the single adjustment amplitude of the driving voltage of the proportional valve; if the oxygen concentration rises, the proportional valve driving voltage is regulated by adopting a PID control method, and the output gas concentration after the oxygen concentration rises is controlled to reach the preset target concentration.
In one embodiment, the determining whether the oxygen concentration increases, if the oxygen concentration does not change, increasing the single adjustment range of the proportional valve driving voltage includes the steps of:
after setting the driving voltage of the proportional valve to an empirical voltage value, judging the change of the oxygen concentration of the output gas within a set time threshold;
if the oxygen concentration of the output gas is judged to be unchanged, the single adjustment amplitude of the proportional valve driving voltage is increased, and the set time threshold is taken as a judging interval to judge whether the oxygen concentration of the output gas is changed or not, if the oxygen concentration of the output gas is judged to be unchanged, the single adjustment amplitude of the proportional valve driving voltage is further increased until the oxygen concentration of the output gas is detected to be changed, and the proportional valve is in an open state.
In one embodiment, the controlling the concentration of the gas output after the oxygen concentration rises to reach the preset target concentration includes:
if the preset target oxygen concentration is 100%, and the oxygen concentration of the output gas is detected to reach the preset target oxygen concentration, gradually reducing the driving voltage of the proportional valve until the oxygen concentration of the output gas is detected to be lower than the preset target oxygen concentration, and then slowly increasing the driving voltage of the proportional valve until the oxygen concentration of the output gas is 100%.
In one embodiment, adjusting the proportional valve drive voltage using a PID control method includes:
the PID control method is used for carrying out sectional adjustment on the adjustment time interval and the single adjustment amplitude of the driving voltage of the proportional valve.
In one embodiment, the PID control method performs segment management on the proportional valve driving voltage adjustment time interval and the single adjustment amplitude, and includes the steps of:
judging the flow of the output gas;
when the flow rate of the output gas is less than 10L/min, setting the single adjustment interval of the proportional valve driving voltage to be 3 seconds and the single adjustment amplitude not to exceed 0.001V;
when the flow of the output gas is 10L/min-20L/min, setting the single adjustment time interval of the driving voltage of the proportional valve to be 2 seconds, wherein the single adjustment amplitude is not more than 0.001V;
when the flow rate of the output gas exceeds 20L/min, the single adjustment time interval of the driving voltage of the proportional valve is set to be 1 second, and the single adjustment amplitude does not exceed 0.035V.
In one embodiment, a fan is used to exhaust the output gas to a gas flow detection channel.
In one embodiment, a flow sensor is used to measure the flow of the output gas.
In one embodiment, the rotational speed of the blower is adjusted based on feedback from the flow sensor.
In one embodiment, an oxygen concentration sensor is used to measure the oxygen concentration of the output gas.
In another aspect, the present application also provides a respiratory support apparatus comprising a processor and a memory;
the memory is used for storing a computer program;
the processor is configured to execute the computer program and implement the automatic control method for oxygen concentration of a respiratory support apparatus according to the first aspect when the computer program is executed.
Compared with the prior art, the invention has the following beneficial effects: according to the automatic control method for the oxygen concentration of the breathing support equipment, the driving voltage of the proportional valve is set to be an empirical voltage value to control the oxygen to enter, so that the oxygen concentration of the breathing support equipment can be controlled without using a pressure reducing valve; and the proportion valve driving voltage is regulated by a PID control method, so that the control step of the breathing equipment on the oxygen concentration of the gas is simplified, and the control efficiency of the oxygen concentration is improved.
Drawings
The invention is described in further detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic flow chart of a method of controlling oxygen concentration in one embodiment;
FIG. 2 is a flow chart of a method for automatically controlling oxygen concentration in a respiratory support apparatus according to one embodiment;
FIG. 3 is a flow chart of setting the driving voltage of the proportional valve to an empirical voltage value in one embodiment;
FIG. 4 is a schematic flow chart of controlling the output gas concentration to reach the preset target concentration after the oxygen concentration is increased in one embodiment.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
It should be noted that, the sequence numbers mentioned in this document, such as S100, S200 and … …, are merely used as distinction between steps and do not represent that the steps must be strictly executed according to the sequence numbers.
Example 1
The present embodiment provides an oxygen concentration control method as shown in fig. 1, in which high-pressure oxygen is mixed with air, and the oxygen concentration of the output gas is controlled and regulated by this method so that the required oxygen concentration value can be achieved.
In one embodiment, as shown in fig. 2, there is provided an oxygen concentration automatic control method for a respiratory support apparatus, which is described by taking a flow chart of fig. 1 as an example, and includes the following steps:
step S100 is as follows: acquiring a preset target flow and a preset target oxygen concentration;
specifically, the target flow and the target oxygen concentration are set by a user on a human-computer interface, the user can be medical care, a patient or an oxygen user, and the like, and the terminal for setting the target flow and the target oxygen concentration can be a breathing support device or a wireless device such as a mobile phone, a computer, and the like which can be connected with the breathing support device.
Step S200: judging whether the preset target oxygen concentration is larger than a system set value, if so, setting the driving voltage of the proportional valve to be an empirical voltage value, and if not, keeping the proportional valve in a closed state;
specifically, the preset system set point of the device can set the concentration of oxygen to 21%, and then the target oxygen concentration set by the user through the device is compared with the system set point to judge the size of the target oxygen concentration and the system set point. And then the proportional valve voltage is regulated according to the comparison condition of the target oxygen concentration and the system set value. If the target oxygen concentration set by the user is larger than the system set value, namely, the target oxygen concentration is more than or equal to 21%, setting the driving voltage of the proportional valve to be an empirical voltage value, wherein the empirical voltage value is a voltage which is obtained through experiments in the earlier stage and is relatively close to the opening of the proportional valve and is used for driving the proportional valve to be opened; if it is determined that the target oxygen concentration set by the user is less than the system set value, that is, the target oxygen concentration is <21%, the proportional valve is maintained in a closed state without adjusting the proportional valve.
Step S300: judging whether the oxygen concentration rises, if the oxygen concentration does not change, increasing the single adjustment amplitude of the driving voltage of the proportional valve; if the oxygen concentration rises, the proportional valve driving voltage is regulated by adopting a PID control method, and the output gas concentration after the oxygen concentration rises is controlled to reach the preset target concentration.
Specifically, whether the proportional valve is opened or not can be judged by detecting the rising condition of the oxygen concentration, and when the rising condition of the oxygen concentration is detected, the proportional valve is opened, and the input oxygen increases the oxygen concentration of the output gas through the proportional valve; if the oxygen concentration is detected to be unchanged, the proportional valve is not opened, and the input oxygen cannot influence the oxygen concentration of the output gas through the proportional valve.
The PID control method controls the driving voltage of the proportional valve according to the proportion, integral and derivative of errors generated by comparing the information acquired by real-time data of the oxygen concentration of the output gas with the system set value, and adjusts the opening degree of the proportional valve by controlling the driving voltage of the proportional valve so as to influence the input of oxygen, so that the oxygen concentration of the output gas can reach the preset target oxygen concentration.
In one embodiment, as shown in fig. 3, the determining whether the oxygen concentration is increased, if the oxygen concentration is unchanged, increasing the single adjustment range of the proportional valve driving voltage includes the steps of:
step S201: after setting the driving voltage of the proportional valve to an empirical voltage value, judging the change of the oxygen concentration of the output gas within a set time threshold;
specifically, since the empirical voltage value is a voltage that is relatively close to the opening of the proportional valve obtained by experiments in the early stage, a detection step is required to determine whether the proportional valve is opened by the driving voltage after setting the driving voltage of the proportional valve to the empirical voltage value, so that the oxygen concentration of the output gas is detected, the state of the proportional valve is determined, and a time interval for detecting the oxygen concentration of the output gas is set to make the next execution.
Step S202: if the oxygen concentration of the output gas is judged to be unchanged, the single adjustment amplitude of the proportional valve driving voltage is increased, and the set time threshold is taken as a judging interval to judge whether the oxygen concentration of the output gas is changed or not, if the oxygen concentration of the output gas is judged to be unchanged, the single adjustment amplitude of the proportional valve driving voltage is further increased until the oxygen concentration of the output gas is detected to be changed, and the proportional valve is in an open state.
Specifically, the oxygen concentration of the output gas is determined, and if the oxygen concentration of the output gas does not change, the drive voltage of the proportional valve needs to be adjusted. Setting the judgment interval period of each time to be 20s to detect whether the oxygen concentration of the output gas changes in the judgment period of 20s, if the oxygen concentration of the output gas is not changed, adjusting the proportional valve driving voltage according to the judgment result of each time, and always performing operations of detecting the oxygen concentration of the output gas and increasing the proportional valve driving voltage until the oxygen concentration of the output gas is detected to change, wherein the proportional valve is in an opened state.
In one embodiment, as shown in fig. 4, controlling the concentration of the gas output after the oxygen concentration rises to reach the preset target concentration includes:
if the preset target oxygen concentration is 100%, and the oxygen concentration of the output gas is detected to reach the preset target oxygen concentration, gradually reducing the driving voltage of the proportional valve until the oxygen concentration of the output gas is detected to be lower than the preset target oxygen concentration, and then slowly increasing the driving voltage of the proportional valve until the oxygen concentration of the output gas is 100%.
Specifically, because independent flow sensors are not arranged on the oxygen branch and the air branch, when the oxygen concentration is set to be 100%, the problem of overshoot can occur when PID control is used, and the oxygen input quantity exceeds the final output quantity after the overshoot, so that a part of oxygen is left from the air branch, waste is caused on one hand, and in addition, the risk of ignition is also caused by oxygen leakage. To avoid this problem, when the target oxygen concentration is set to 100%, when the measured oxygen concentration reaches 100%, the driving voltage of the proportional valve starts to be gradually reduced until when the oxygen concentration output is less than 100%, at which point it is indicated that the oxygen input amount has been smaller than the output flow after mixing. Then slowly increasing the output of the proportional valve until the oxygen concentration is 100%, wherein the output of the oxygen is just equal to the output flow after mixing, and the problem of leakage of the oxygen from the air branch is avoided.
In one embodiment, adjusting the proportional valve drive voltage using a PID control method includes:
the PID control method is used for carrying out sectional adjustment on the adjustment time interval and the single adjustment amplitude of the driving voltage of the proportional valve.
Specifically, at low flows, a slight change in oxygen flow causes a relatively large change in oxygen concentration, and in order to stabilize the output oxygen concentration as quickly as possible, the proportional valve drive voltage adjustment time interval and the single adjustment amplitude are adjusted in segments.
In one embodiment, the PID control method performs segment management on the proportional valve driving voltage adjustment time interval and the single adjustment amplitude, and includes the steps of:
judging the flow of the output gas;
when the flow rate of the output gas is less than 10L/min, setting the single adjustment interval of the proportional valve driving voltage to be 3 seconds and the single adjustment amplitude not to exceed 0.001V;
when the flow of the output gas is 10L/min-20L/min, setting the single adjustment time interval of the driving voltage of the proportional valve to be 2 seconds, wherein the single adjustment amplitude is not more than 0.001V;
when the flow rate of the output gas exceeds 20L/min, the single adjustment time interval of the driving voltage of the proportional valve is set to be 1 second, and the single adjustment amplitude does not exceed 0.035V.
In one embodiment, a fan is used to exhaust the output gas to a gas flow detection channel.
Specifically, the fan can rely on the mechanical energy of input to improve gas pressure and discharge gas, and after the oxygen of equipment input and air were mixed, need to discharge mixed gas to detection channel or output channel through the fan and carry out flow detection or oxygen concentration detection.
In one embodiment, a flow sensor is used to measure the flow of the output gas.
Specifically, the flow rate of the output gas is measured by a flow sensor, which is not disposed in the oxygen input branch and the air input branch, but is disposed in the gas passage of the output gas.
In one embodiment, the rotational speed of the blower is adjusted based on feedback from the flow sensor.
Specifically, the rotational speed of the fan affects the flow of the output gas, and the flow of the output gas is detected by the flow sensor, and the device controls the feedback of the flow sensor to adjust the rotational speed of the fan so as to change the flow of the gas.
In one embodiment, an oxygen concentration sensor is used to measure the oxygen concentration of the output gas.
Specifically, the oxygen concentration of the output gas is measured by an oxygen concentration sensor that is not provided in the oxygen input branch but in the gas passage of the output gas.
In summary, according to the automatic control method for oxygen concentration of the respiratory support device provided by the application, the driving voltage of the proportional valve is set to be an empirical voltage value to control the entry of oxygen, and the oxygen concentration of the respiratory support device can be controlled without using a pressure reducing valve; in addition, the increased cost of arranging the flow sensors on the oxygen input branch and the air input branch respectively can be reduced; the proportion valve driving voltage is regulated by the PID control method, so that the control step of the breathing equipment on the oxygen concentration of the gas is simplified, and the control efficiency of the oxygen concentration is improved. And can carry out feedback regulation under the state that PID control appears the overshoot for breathing equipment is safer when outputting oxygen. Meanwhile, the control time interval and the control amplitude of the driving voltage of the proportional valve are managed and controlled in a segmented mode according to the size of the gas flow so as to control the output gas concentration to reach the preset target concentration after the oxygen concentration rises, and the output oxygen concentration can be enabled to be faster and stable.
Example 2
The embodiment provides breathing support equipment, which comprises a processor and a memory, wherein the memory is used for storing a computer program; the processor is configured to execute the computer program and implement the oxygen concentration automatic control method of the respiratory support apparatus provided in embodiment 1 of the present invention when executing the computer program. It should be appreciated that the processor may be a central processing unit (CentralProcessingUnit, CPU), but may also be other general purpose processors, digital signal processors (DigitalSignalProcessor, DSP), application specific integrated circuits (ApplicationSpecificIntegratedCircuit, ASIC), field programmable gate arrays (Field-ProgrammableGateArray, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like.
Wherein the general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but rather is intended to cover any and all modifications, equivalents, alternatives, and improvements within the spirit and principles of the present application.
Claims (9)
1. An automatic control method for oxygen concentration of a respiratory support device, comprising the steps of:
acquiring a preset target flow and a preset target oxygen concentration;
judging whether the preset target oxygen concentration is larger than a system set value, if so, setting the driving voltage of the proportional valve to be an empirical voltage value, and if not, keeping the proportional valve in a closed state;
judging whether the oxygen concentration rises, if the oxygen concentration does not change, increasing the single adjustment amplitude of the driving voltage of the proportional valve; if the oxygen concentration rises, adjusting the driving voltage of the proportional valve by adopting a PID control method, and controlling the output gas concentration to reach the preset target oxygen concentration after the oxygen concentration rises, wherein controlling the output gas concentration to reach the preset target oxygen concentration after the oxygen concentration rises further comprises the step of controlling overshoot: if the preset target oxygen concentration is 100%, and the oxygen concentration of the output gas is detected to reach the preset target oxygen concentration, gradually reducing the driving voltage of the proportional valve until the oxygen concentration of the output gas is detected to be lower than the preset target oxygen concentration, and then slowly increasing the driving voltage of the proportional valve until the oxygen concentration of the output gas is 100%.
2. The method according to claim 1, wherein the step of determining whether the oxygen concentration has risen, and if the oxygen concentration has not changed, increasing the single adjustment range of the proportional valve driving voltage comprises the steps of:
after setting the driving voltage of the proportional valve to an empirical voltage value, judging the change of the oxygen concentration of the output gas within a set time threshold;
if the oxygen concentration of the output gas is judged to be unchanged, the single adjustment amplitude of the proportional valve driving voltage is increased, and the set time threshold is taken as a judging interval to judge whether the oxygen concentration of the output gas is changed or not, if the oxygen concentration of the output gas is judged to be unchanged, the single adjustment amplitude of the proportional valve driving voltage is further increased until the oxygen concentration of the output gas is detected to be changed, and the proportional valve is in an open state.
3. The method for automatically controlling the oxygen concentration of a respiratory support apparatus according to claim 1, wherein adjusting the proportional valve driving voltage by a PID control method comprises:
the PID control method is used for carrying out sectional adjustment on the adjustment time interval and the single adjustment amplitude of the driving voltage of the proportional valve.
4. The automatic control method for oxygen concentration of respiratory support apparatus according to claim 3, wherein the PID control method performs a segment management of a proportional valve driving voltage adjustment time interval and a single adjustment amplitude, comprising the steps of:
judging the flow of the output gas;
when the flow rate of the output gas is less than 10L/min, setting the single adjustment interval of the proportional valve driving voltage to be 3 seconds and the single adjustment amplitude not to exceed 0.001V;
when the flow of the output gas is 10L/min-20L/min, setting the single adjustment time interval of the driving voltage of the proportional valve to be 2 seconds, wherein the single adjustment amplitude is not more than 0.001V;
when the flow rate of the output gas exceeds 20L/min, the single adjustment time interval of the driving voltage of the proportional valve is set to be 1 second, and the single adjustment amplitude does not exceed 0.035V.
5. The method according to claim 4, wherein the output gas is discharged to the gas flow rate detection passage by a blower.
6. The method according to claim 5, wherein the flow rate of the output gas is measured by a flow rate sensor.
7. The method according to claim 6, wherein the rotational speed of the blower is adjusted based on feedback from the flow sensor.
8. The method according to claim 1, wherein an oxygen concentration sensor is used to measure the oxygen concentration of the output gas.
9. A respiratory support apparatus comprising a processor and a memory;
the memory is used for storing a computer program;
the processor for executing the computer program and implementing the breathing support apparatus oxygen concentration automatic control method according to any one of claims 1 to 8 when the computer program is executed.
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| FR2692152B1 (en) * | 1992-06-15 | 1997-06-27 | Pierre Medical Sa | BREATHING AID, PARTICULARLY FOR TREATING SLEEP APNEA. |
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| CN103071214A (en) * | 2011-10-25 | 2013-05-01 | 北京航天长峰股份有限公司 | Method for controlling respirator output oxygen concentration |
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| CN104874085B (en) * | 2014-02-28 | 2018-11-16 | 北京谊安医疗系统股份有限公司 | The self checking method and ventilator of oxygen solenoid valve for ventilator |
| CN104834326B (en) * | 2015-04-01 | 2017-12-19 | 深圳市科曼医疗设备有限公司 | Lung ventilator oxygen concentration control method, device and system |
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| CN109771757A (en) * | 2017-11-10 | 2019-05-21 | 北京航天长峰股份有限公司 | The control of ventilator output gas concentration and proportion algorithm |
| EP3819002B1 (en) * | 2019-11-11 | 2024-02-28 | Löwenstein Medical Technology S.A. | Ventilator including a control unit for controlling oxygen concentration in a breathing gas |
| US11872349B2 (en) * | 2020-04-10 | 2024-01-16 | Covidien Lp | Systems and methods for increasing ventilator oxygen concentration |
| CN111701133A (en) * | 2020-07-22 | 2020-09-25 | 苏州南博智能科技有限公司 | Novel proportional valve for breathing machine |
| US20240042161A1 (en) * | 2020-09-18 | 2024-02-08 | Carnegie Mellon University | System and Method for Operating a Ventilator |
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| CN103055397A (en) * | 2011-10-18 | 2013-04-24 | 北京谊安医疗系统股份有限公司 | Control method and control device for breathing machine oxygen concentration |
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