Respiratory support apparatus airway and safety control system and control method

Abstract

This invention provides an airway and safety control system and method for a respiratory support device. The airway of the respiratory support device includes a main air intake passage, a reserve air intake passage, and a breathing mask. The main air intake passage and the reserve air intake passage are connected in parallel and are respectively connected to the breathing mask. An outlet pressure sensor is provided at the front end of the outlet of the main air intake passage. The breathing mask includes a mask body, a pressure sampling port, and a mask pressure sensor. A control method for the respiratory support device is also provided. The processor module, turbine module, pressure sensor, and power supply module of the respiratory support device control system are each equipped with a backup module. These modules can work together or independently to complete the air delivery function. When one module fails, the other module can take over the work of the current module, maintaining the set output pressure of the respiratory support device, maintaining normal breathing for the user, and ensuring the user's safety.

Description

Technical Field

[0001] This invention relates to the field of medical device manufacturing technology, specifically to a respiratory support device airway and safety control system and control method. Background Technology

[0002] In the field of medical respiratory support equipment (such as ventilators and high-flow humidification therapy devices), respiratory support equipment, as one of the life support devices, should have stable working performance. Even if one of the functional modules fails, it should be able to be used in a degraded manner and should not stop supplying air, so as to ensure the safety of personnel.

[0003] The working principle of a turbine-based respiratory support device is as follows: the device's processor controls the turbine speed to achieve the user-set pressure by collecting pressure data from the patient. Existing medical respiratory support devices are composed of various functional modules, typically including a turbine control module, algorithm module, display module, and power supply module. If any one of these modules fails, the respiratory support device will stop working. Manufacturers now ensure the stability of respiratory support devices through module selection, design, aging testing, and regular maintenance and inspection. Because the consistency of electronic components cannot be guaranteed to be 100%, short-term aging cannot fully detect all problems, and with continued use, the aging of electronic components makes individual component failures more likely, causing the respiratory support device to malfunction. Respiratory support devices contain numerous electronic components, so individual component failure cannot be guaranteed. In reality, there have been many cases where the failure of a single component caused the respiratory support device to stop working, posing a life-threatening risk.

[0004] A traditional pneumatic respirator with safety monitoring function based on the Internet of Things (CN201510847047) discloses a pneumatic respirator including a central control device, a respiratory support device electrically connected to the central control device, and a monitoring and alarm mechanism. The respiratory support device includes an inspiratory air source device, a humidifier, an oxygen partial pressure device, a respiratory control device, a vital capacity measuring device, and a breathing mouthpiece. The inspiratory air source device is connected to the humidifier, and the oxygen partial pressure device is also connected to the humidifier. This IoT-based pneumatic respirator with safety monitoring function enables staff to monitor the user's use of the respirator in real time through a wireless communication module. The monitoring and alarm module enables the oxygen source pressure alarm device, power disconnection alarm device, switching fault alarm device, temperature detection device, level sensor, and airway pressure measuring device to monitor the working status of the respirator in real time and issue timely alarms, improving the reliability of the respirator. However, this invention only monitors each module of the respiratory support device in real time and then issues an alarm, which plays a certain warning role, but the processing time for faults still poses unpredictable risks to patients.

[0005] Therefore, there is an urgent need for a functionally safe and reliable respiratory support device that reduces its failure rate in order to minimize the risk to patients. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and propose a respiratory support device airway and safety control system and control method. The processor module, turbine module, pressure sensor and power supply module of the respiratory support device are each equipped with a backup module, which can work together or independently to complete the air delivery function. When one module fails, the other module can take over the work of the current module to maintain the output set pressure of the respiratory support device, maintain the user's normal breathing and ensure the user's life safety.

[0007] To achieve the above objectives, the present invention provides a respiratory support device airway, comprising:

[0008] The main intake passage includes a turbine and a main intake passage outlet. The turbine's intake end is equipped with a first switching valve for controlling the air flow. The main intake passage outlet is equipped with an outlet pressure sensor at its front end.

[0009] The oxygen intake passage includes a high-pressure oxygen inlet and a gas storage bag. The high-pressure oxygen inlet is equipped with a second switch valve for controlling the on / off of the high-pressure oxygen. The gas storage bag is located at the rear end of the second switch valve. The gas storage bag is connected in parallel to the oxygen intake passage through a third switch valve 25.

[0010] The breathing mask includes a mask body, the mask body is provided with a pressure sampling port, and the pressure sampling port is provided with a mask pressure sensor;

[0011] The oxygen intake passage is connected to the main intake passage at the front end of the turbine intake port;

[0012] The mask body is connected to the air outlet of the main air intake passage via an air supply pipe.

[0013] Furthermore, the main air intake passage also includes a mixed gas flow sensor, which is located between the oxygen intake passage inlet and the outlet pressure sensor.

[0014] Furthermore, the oxygen intake passage also includes an oxygen pressure sensor and an oxygen flow sensor. The oxygen pressure sensor is located on the main oxygen intake passage, and an oxygen flow sensor is also provided at the outlet end of the oxygen intake passage. A proportional valve is also provided between the gas storage bag and the oxygen flow sensor.

[0015] Furthermore, the outlet pressure sensor is used to detect the pressure at the outlet of the main air intake passage, and the mask pressure sensor is used to detect the pressure inhaled by the human body through the mask body.

[0016] Furthermore, the mixed gas flow sensor is used to detect the mixed gas flow rate in the main intake passage.

[0017] Furthermore, the oxygen pressure sensor is used to detect the oxygen pressure within the oxygen intake passage.

[0018] Furthermore, the oxygen flow sensor is used to detect the oxygen flow rate in the oxygen intake passage.

[0019] Furthermore, the third switching valve is used to control the on / off of high-pressure oxygen inside the gas storage bladder.

[0020] Furthermore, the proportional valve is used to regulate the output of high-pressure oxygen.

[0021] The present invention also provides a safety control system for a respiratory support device employing the airway of the aforementioned respiratory support device, characterized in that it comprises:

[0022] The processor includes a turbine control processor and an algorithm processor, wherein the algorithm processor communicates with the turbine control processor via a general-purpose digital interface.

[0023] Under normal circumstances, the turbine control processor controls the turbine speed to supply air to the patient, and the algorithm processor calculates the patient's respiratory status and respiratory parameters; when the turbine control processor malfunctions, the algorithm processor collects the pressure from the mask pressure sensor and controls the turbine speed; when the algorithm processor malfunctions, the turbine control processor collects the pressure from the mask pressure sensor and controls the turbine speed.

[0024] The power module includes a 220V AC power module and a battery module. The 220V AC power module is stepped down to 24V by an AC power step-down module. The battery module is 24V. The 220V AC power module and the battery module are connected in parallel. Under normal circumstances, the 220V AC power module provides power and the battery module is a backup power source. If the 220V AC power module fails, the battery module starts to provide power.

[0025] The power module supplies power to the turbine control processor and the outlet pressure sensor through the first step-down module, and supplies power to the algorithm processor, oxygen pressure sensor and mask pressure sensor through the second step-down module.

[0026] Furthermore, the respiratory support device safety control system also includes a display module, and the power module supplies power to the display module through a third step-down module.

[0027] Furthermore, the power module directly supplies power to the turbine.

[0028] Furthermore, the power module supplies power to the oxygen flow sensor, the mixed gas flow sensor, the proportional valve, the first switching valve, the second switching valve, and the third switching valve through the fourth step-down module.

[0029] The present invention also provides a control method for a safety control system of a respiratory support device, the steps of which include:

[0030] S1: The system is powered on and the control system is started;

[0031] S2: Check the status of the algorithm processor and turbine control processor to determine if they are functioning correctly.

[0032] S21: Both the algorithm processor and the turbine control processor are normal. The algorithm processor reads the user-set pressure value and calculates the pressure P required by the patient, and then sends it to the turbine control processor. The turbine control processor collects the pressure P1 from the mask pressure sensor and the pressure P2 from the outlet pressure sensor, respectively.

[0033] S22: When the turbine control processor fails, the algorithm processor reads the user-set pressure value and calculates the pressure P required by the patient. The algorithm processor collects the pressure P1 from the mask pressure sensor. The algorithm processor controls the turbine and issues a fault alarm.

[0034] S23: When the algorithm processor fails, the turbine control processor collects the pressure P1 from the mask pressure sensor, controls the turbine, and issues a fault alarm.

[0035] S3: Under normal circumstances, compare the pressure P1 from the mask pressure sensor and the pressure P2 from the outlet pressure sensor collected by the turbine control processor to determine the feedback control quantity.

[0036] S4: The turbine control processor controls the turbine output pressure P to supply gas to the patient;

[0037] S5: The algorithm processor collects the turbine operating current I and compares it with the user-set value; if an abnormality occurs, the turbine control processor notifies the algorithm processor that the turbine has failed, the algorithm processor alarms to indicate the turbine failure, and prompts to connect compressed air to the high-pressure oxygen inlet to start the gas storage bag to supply gas.

[0038] Furthermore, the steps for determining the control quantity are as follows:

[0039] S31: If P1=P2, use the pressure P1 of the mask pressure sensor as the feedback control quantity.

[0040] S32: If P1≠P2, the turbine control processor controls the turbine to increase power. The turbine control processor collects the pressure P1' from the mask pressure sensor and the pressure P2' from the outlet pressure sensor, respectively.

[0041] Compare the values ​​of P1' and P1. If P1 = P1', it is determined that the mask pressure sensor is faulty, and the pressure P2 of the outlet pressure sensor is used as the feedback control quantity. If P1 ≠ P1', it is determined that the pressure of the outlet pressure sensor is faulty, and the pressure P1 of the mask pressure sensor is used as the feedback control quantity.

[0042] Compare the values ​​of P2' and P2. If P2 = P2', it is determined that the pressure of the outlet pressure sensor is faulty, and the pressure of the mask pressure sensor P1 is used as the feedback control quantity. If P2 ≠ P2', it is determined that the mask pressure sensor is faulty, and the pressure of the outlet pressure sensor P2 is used as the feedback control quantity.

[0043] Furthermore, the step of activating the air reservoir to supply air is as follows:

[0044] S51: The algorithm processor controls the opening of the third switching valve and the closing of the first switching valve;

[0045] S52: The algorithm processor controls the proportional valve, using the pressure P1 collected by the algorithm processor as the control quantity;

[0046] S53: The algorithm processor controls the opening of the second switch valve, the closing of the third switch valve, and the acquisition of the pressure P3 from the oxygen pressure sensor;

[0047] S54: Compare the pressure P3 collected by the oxygen pressure sensor with the set value.

[0048] When P3 is greater than the set value, external gas is introduced, and the algorithm processor controls the opening of the second and third switching valves, and outputs pressure by controlling the proportional valve.

[0049] When P3 is less than the set value, no external gas is connected. The algorithm processor controls the second switching valve to close and the third switching valve to open, and outputs pressure by controlling the proportional valve.

[0050] Because the present invention adopts the above technical solutions, the beneficial effects of this application are as follows:

[0051] 1. The respiratory support device of the present invention has an airway with an air reservoir. When the turbine control processor controls the turbine to rotate, it detects that the turbine's operating current does not reach the set value, determines that the turbine is faulty, and returns a turbine fault command to the algorithm processor. The algorithm processor controls the first switch valve to close and the third switch valve to open, so as to deliver the high-pressure oxygen in the air reservoir to the patient and prompts to connect compressed air to the high-pressure oxygen inlet, which greatly reduces the risk to the patient due to turbine failure.

[0052] 2. The respiratory support device of the present invention uses dual pressure sensors in the airway: a mask pressure sensor detects the pressure at the mask end, and an outlet pressure sensor detects the pressure at the outlet of the main air intake passage. The device monitors these two pressure sensors in real time. Under normal circumstances, the turbine is controlled in a closed loop based on the pressure at the mask end. The pressure sensor at the outlet of the main air intake passage is used as an auxiliary detection to prevent the pressure sensor from failing due to a single fault.

[0053] 3. The processor of the respiratory support device safety control system of the present invention includes an algorithm processor and a turbine control processor. The turbine control processor is used to control the turbine speed and can calculate the respiratory status to supply air to the patient. The algorithm processor is used to calculate the respiratory status and respiratory parameters and can independently control the turbine.

[0054] The algorithm processor and the turbine control processor communicate through a universal digital interface; even if either processor fails, the respiratory support device can be kept running, ensuring the patient's safety.

[0055] 4. The power module of this invention includes a 220V AC mains module and a battery module. The 220V AC mains module is stepped down to 24V via an AC power step-down module, and the battery module is also 24V. The 220V AC mains module and the battery module are connected in parallel. Under normal circumstances, the 220V AC mains module provides power, and the battery module serves as a backup power source. If the 220V AC mains module fails, the battery module starts supplying power. The power module supplies power to the turbine control processor and the outlet pressure sensor via a first step-down module, and to the algorithm processor, oxygen pressure sensor, and mask pressure sensor via a second step-down module. In the event of a single power module failure, the probability of 24V voltage interruption is greatly reduced. The respiratory support system is powered independently via either the first or second step-down module. If either the first or second step-down module fails, there is still power to the processor and pressure sensor. This ensures that even if the power module fails, the turbine power supply, processor power supply, and pressure sensor power supply can still operate normally.

[0056] 5. The processor module, turbine module, pressure sensor and power supply module of the respiratory support device of the present invention are each equipped with a backup module, which can work together or work independently to complete the air delivery function. When one module fails, the other module can take over the work of the current module to maintain the output set pressure of the respiratory support device, maintain the user's normal breathing and ensure the user's life safety. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 This is a schematic diagram of the airway structure of a respiratory support device according to the present invention.

[0059] Figure 2 This is a block diagram of the power module structure of the present invention.

[0060] Figure 3 This is a block diagram of a control system for a respiratory support device processor according to the present invention.

[0061] Figure 4 This is a flowchart of a control method for a safety control system of a respiratory support device according to the present invention.

[0062] The attached diagram is labeled as follows: 1. Main air intake passage; 10. Main air intake passage inlet; 11. First switching valve; 12. Turbine; 13. Mixed gas flow sensor; 14. Outlet pressure sensor; 15. Main air intake passage outlet; 16. Mask pressure sensor; 2. Oxygen intake passage; 21. High-pressure oxygen inlet; 22. Second switching valve; 23. Oxygen pressure sensor; 24. Proportional valve; 25. Third switching valve; 26. Gas reservoir; 27. Oxygen flow sensor; 3. Breathing mask; 31. Gas delivery pipe; 32. Mask body; 33. Pressure sampling port. Detailed Implementation

[0063] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0064] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0065] Example 1: Airway Example of a Respiratory Support Device

[0066] Reference Figure 1 This embodiment provides a respiratory support device airway, including:

[0067] The main intake passage 1 includes a turbine 12 and a main intake passage outlet 10. The turbine 12 is provided with a first switching valve 11 for controlling the air flow. The main intake passage outlet 15 is provided with an outlet pressure sensor 14 at its front end.

[0068] The oxygen intake passage 2 includes a high-pressure oxygen inlet 21 and a gas storage bag 26. The high-pressure oxygen inlet 21 is provided with a second switching valve 22 for controlling the on / off of high-pressure oxygen. The gas storage bag 26 is located at the rear end of the second switching valve. The gas storage bag 26 is connected in parallel to the oxygen intake passage 2 through a third switching valve 25.

[0069] The breathing mask 3 includes a mask body 32, the mask body 32 is provided with a pressure sampling port 33, and the pressure sampling port 33 is provided with a mask pressure sensor 16.

[0070] Oxygen intake passage 2 is connected to main intake passage 1 at the front end of turbine 12 intake port;

[0071] The mask body 32 is connected to the air outlet 15 of the main air intake passage through the air supply pipe 31.

[0072] As a preferred embodiment / implementation method, refer to Figure 1 The main intake passage 1 also includes a mixed gas flow sensor 13, which is located between the oxygen intake passage 2 inlet and the outlet pressure sensor 14.

[0073] As a preferred embodiment / implementation method, refer to Figure 1 The oxygen inlet passage 2 also includes an oxygen pressure sensor 23, which is located at the rear end of the second switching valve 22. An oxygen flow sensor 27 is also provided at the outlet end of the oxygen inlet passage 2. A proportional valve 24 is also provided between the gas storage bag 26 and the oxygen flow sensor 27. The proportional valve 24 is used to adjust the output of high-pressure oxygen.

[0074] It should be noted that the outlet pressure sensor 14 is used to detect the pressure at the outlet 15 of the main air intake passage, and the mask pressure sensor 16 is used to detect the pressure inhaled by the human body in the mask body 32.

[0075] The mixed gas flow sensor 13 is used to detect the mixed gas flow rate in the main intake passage 1.

[0076] The oxygen pressure sensor 23 is used to detect the oxygen pressure in the oxygen intake passage 2.

[0077] The oxygen flow sensor 27 is used to detect the oxygen flow rate in the oxygen intake passage.

[0078] The third switching valve 25 is used to control the on / off of high-pressure oxygen in the gas storage bladder 26.

[0079] The respiratory support device safety control system for the airway of the respiratory support device provided in Example 1 is referred to Figure 2 and Figure 3 ,include:

[0080] The processor includes a turbine control processor and an algorithm processor, wherein the algorithm processor communicates with the turbine control processor via a general-purpose digital interface.

[0081] Under normal circumstances, the turbine control processor controls the turbine 12 speed to supply air to the patient, and the algorithm processor calculates the patient's respiratory status and respiratory parameters. When the turbine control processor malfunctions, the algorithm processor collects the pressure 16 from the mask pressure sensor and controls the turbine 12 speed. When the algorithm processor malfunctions, the turbine control processor collects the pressure 16 from the mask pressure sensor and controls the turbine 12 speed. Even if any processor malfunctions, the respiratory support device can be kept running to ensure the patient's safety.

[0082] The algorithm processor is used to collect values ​​from the outlet pressure sensor 14, mask pressure sensor 16, mixed gas flow sensor 13, and oxygen flow sensor 27, and calculate the respiratory status and parameters. A turbine control algorithm is added to the algorithm processor to achieve independent control of the turbine 12. The turbine control processor controls the turbine 12 speed based on the collected pressure values ​​to quickly reach the pressure value required by the algorithm processor. A respiratory algorithm is also added to the turbine control processor to detect the patient's respiratory status and independently achieve air supply. In this invention, the traditional single powerful processor of a respiratory support device is designed as two processors: an algorithm processor for algorithm processing and a turbine control processor for controlling the operation of the turbine 12. This prevents the respiratory support device from shutting down when a single processor fails, facilitates system development, and allows for modular design, facilitating later function porting and system fault maintenance.

[0083] The power module includes a 220V AC mains module and a battery module. The 220V AC mains module is stepped down to 24V by an AC power step-down module. The battery module is 24V. The 220V AC mains module and the battery module are connected in parallel. Under normal circumstances, the 220V AC mains module provides power, and the battery module serves as a backup power source. If the 220V AC mains module fails, the battery module will start supplying power. When a single power module fails, the probability of 24V voltage interruption is greatly reduced.

[0084] The power module supplies power to the turbine control processor and the outlet pressure sensor 14 via a first step-down module, and to the algorithm processor, oxygen pressure sensor 13, and mask pressure sensor 16 via a second step-down module. If either the first or second step-down module fails, the processor and pressure sensor still have power, ensuring that even if a single power module fails, the turbine power supply, processor power supply, and pressure sensor power supply can still operate normally.

[0085] As a preferred embodiment / implementation, the respiratory support device safety control system further includes a display module, and the power module supplies power to the display module through a third step-down module.

[0086] In a preferred embodiment / implementation, the power module directly supplies power to the turbine 12.

[0087] In a preferred embodiment / implementation, the power supply module supplies power to the oxygen flow sensor 23, the mixed gas flow sensor 13, the proportional valve 24, the first switching valve 11, the second switching valve 22, and the third switching valve 25 through the fourth step-down module.

[0088] The control method of the respiratory support device safety control system provided in Example 1 is as follows: Figure 4 The steps include:

[0089] S1: The system is powered on and the control system is started;

[0090] S2: Check the status of the algorithm processor and turbine control processor to determine if they are functioning correctly.

[0091] S21: Both the algorithm processor and the turbine control processor are normal. The algorithm processor reads the user-set pressure value and calculates the pressure P required by the patient, and then sends it to the turbine control processor. The turbine control processor collects the pressure P1 from the mask pressure sensor and the pressure P2 from the outlet pressure sensor, respectively.

[0092] S22: When the turbine control processor fails, the algorithm processor reads the user-set pressure value and calculates the pressure P required by the patient. The algorithm processor collects the pressure P1 from the mask pressure sensor 16. The algorithm processor controls the turbine 12 and issues a fault alarm.

[0093] S23: When the algorithm processor fails, the turbine control processor collects the pressure P1 from the mask pressure sensor 16, controls the turbine, and issues a fault alarm.

[0094] S3: Under normal circumstances, compare whether the pressure P1 of the mask pressure sensor 16 and the pressure P2 of the outlet pressure sensor 14 collected by the turbine control processor are equal to determine the feedback control quantity.

[0095] S4: The turbine control processor controls the turbine output pressure P to supply gas to the patient;

[0096] S5: The algorithm processor collects the operating current I of turbine 12 and compares it with the user-set value; if an abnormality occurs, the turbine control processor notifies the algorithm processor that the turbine has failed, the algorithm processor alarms to indicate the turbine failure, and prompts to connect compressed air to the high-pressure oxygen inlet 21 and start the air storage bag 26 to supply air.

[0097] As a preferred embodiment / implementation method, refer to Figure 4 The steps to determine the feedback control quantity are as follows:

[0098] S31: If P1=P2, use the pressure P1 of the mask pressure sensor 16 as the feedback control quantity.

[0099] S32: If P1≠P2, the turbine control processor controls the turbine to increase power. The turbine control processor collects the pressure P1' from the mask pressure sensor 16 and the pressure P2' from the outlet pressure sensor 14, respectively.

[0100] Compare the values ​​of P1' and P1. If P1 = P1', it is determined that the mask pressure sensor 16 is faulty, and the pressure P2 of the outlet pressure sensor 14 is used as the feedback control quantity. If P1 ≠ P1', it is determined that the pressure of the outlet pressure sensor 14 is faulty, and the pressure P1 of the mask pressure sensor 16 is used as the feedback control quantity.

[0101] Compare the values ​​of P2' and P2. If P2 = P2', it is determined that the pressure of the outlet pressure sensor 14 is faulty, and the pressure P1 of the mask pressure sensor 16 is used as the feedback control quantity. If P2 ≠ P2', it is determined that the mask pressure sensor 16 is faulty, and the pressure P2 of the outlet pressure sensor 14 is used as the feedback control quantity.

[0102] As a preferred embodiment / implementation method, refer to Figure 4 The steps for activating the air reservoir 26 to supply air are as follows:

[0103] S51: The algorithm processor controls the opening of the third switch valve 25 and the closing of the first switch valve 11;

[0104] S52: The algorithm processor controls the proportional valve 24, using the pressure P1 collected by the algorithm processor as the control quantity;

[0105] S53: The algorithm processor controls the opening of the second switch valve 22, the closing of the third switch valve 25, and the acquisition of the pressure P3 of the oxygen pressure sensor 23;

[0106] S54: The pressure P3 collected by oxygen pressure sensor 23 is compared with the set value.

[0107] When P3 is greater than the set value, external gas is introduced, and the algorithm processor controls the opening of the second switching valve 22 and the third switching valve 25, and outputs pressure by controlling the proportional valve 24.

[0108] When P3 is less than the set value, no external gas is connected. The algorithm processor controls the second switch valve 22 to close and the third switch valve 25 to open, and outputs pressure by controlling the proportional valve 24.

[0109] The control process for turbine failure is as follows: When the turbine control processor controls the turbine 12 to rotate, it detects that the working current of the turbine 12 does not reach the set value, determines that the turbine 12 is faulty, and returns a turbine 12 fault command to the algorithm processor. The algorithm processor controls the first switch valve 11 to close and the third switch valve 25 to open, so that the high-pressure oxygen in the gas storage bag 26 is delivered to the patient end, greatly reducing the risk to the patient due to turbine failure.

[0110] It should be noted that the respiratory support device of this invention uses closed-loop control of the output gas pressure. If the pressure sensor malfunctions, the respiratory support device processor will not be able to detect the output gas pressure at the patient end, and thus cannot perform closed-loop control of the output gas pressure. The respiratory support device of this invention uses dual pressure sensors in its airway: a mask pressure sensor 16 detects the mask pressure, and an outlet pressure sensor 14 detects the main inlet outlet pressure. The processor monitors these two pressure sensors in real time. Under normal circumstances, closed-loop control of the turbine is performed based on the mask pressure, while the main inlet outlet pressure sensor serves as an auxiliary detection method to prevent the pressure sensor from failing due to a single malfunction.

[0111] Under normal circumstances, the algorithm processor calculates the patient's respiratory status and sends the required pressure and algorithm module operating status commands to the turbine control processor in real time. The turbine control processor controls the turbine to quickly reach the required pressure according to the received commands and returns the agreed response and turbine module status commands. When the algorithm processor sends a command but does not receive a response or receives a turbine failure command, the algorithm processor directly controls turbine 12 to supply air to the patient. When the turbine control processor does not receive commands from the algorithm processor or the algorithm module fails, the turbine control processor directly detects the patient's respiratory status based on the pressure sensor value and controls turbine 12 to supply air to the patient.

[0112] The processor module, turbine module, pressure sensor, and power supply module of the respiratory support device of the present invention are each equipped with a backup module, which can work together or independently to complete the air delivery function. When one module fails, the other module can take over the work of the current module to maintain the set output pressure of the respiratory support device, maintain the user's normal breathing, and ensure the user's life safety.

[0113] The above is a detailed description of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A safety control system for a respiratory support device, comprising an airway for the respiratory support device, characterized in that, The airway of the respiratory support device includes: The main intake passage includes a turbine and a main intake passage outlet. The turbine's intake end is equipped with a first switching valve for controlling the air flow. The main intake passage outlet is equipped with an outlet pressure sensor at its front end. The oxygen intake passage includes a high-pressure oxygen inlet and a gas storage bag. The high-pressure oxygen inlet is equipped with a second switch valve for controlling the on / off of the high-pressure oxygen. The gas storage bag is located at the rear end of the second switch valve and is connected in parallel to the oxygen intake passage through a third switch valve. A breathing mask includes a mask body, the mask body having a pressure sampling port, and the pressure sampling port having a mask pressure sensor; The oxygen intake passage is connected to the main intake passage at the front end of the turbine intake port; The mask body is connected to the air outlet of the main air inlet via an air supply pipe. The respiratory support device safety control system also includes: The processor includes a turbine control processor and an algorithm processor, wherein the algorithm processor communicates with the turbine control processor via a general-purpose digital interface. Under normal circumstances, the turbine control processor controls the turbine speed to supply air to the patient, and the algorithm processor calculates the patient's respiratory status and respiratory parameters; when the turbine control processor malfunctions, the algorithm processor collects the pressure from the mask pressure sensor and controls the turbine speed; when the algorithm processor malfunctions, the turbine control processor collects the pressure from the mask pressure sensor and controls the turbine speed. The power module includes a 220V AC power module and a battery module. The 220V AC power module is stepped down to 24V by an AC power step-down module. The battery module is 24V. The 220V AC power module and the battery module are connected in parallel. Under normal circumstances, the 220V AC power module provides power and the battery module is a backup power source. If the 220V AC power module fails, the battery module starts to provide power. The power module supplies power to the turbine control processor and the outlet pressure sensor through the first step-down module, and supplies power to the algorithm processor, oxygen pressure sensor and mask pressure sensor through the second step-down module.

2. The safety control system for a respiratory support device according to claim 1, characterized in that, The main air intake passage also includes a mixed gas flow sensor, which is located between the oxygen intake passage inlet and the outlet pressure sensor.

3. The safety control system for a respiratory support device according to claim 1, characterized in that, The oxygen intake passage also includes an oxygen pressure sensor and an oxygen flow sensor. The oxygen pressure sensor is located on the main oxygen intake passage, and an oxygen flow sensor is also provided at the outlet end of the oxygen intake passage. A proportional valve is also provided between the gas storage bag and the oxygen flow sensor.

4. The safety control system for a respiratory support device according to claim 1, characterized in that, The respiratory support device also includes a display module, and the power module supplies power to the display module through a third step-down module.

5. A safety control system for a respiratory support device according to claim 1, characterized in that, The power module supplies power to the oxygen flow sensor, mixed gas flow sensor, proportional valve, first switching valve, second switching valve and third switching valve through the fourth step-down module.

6. A safety control system for a respiratory support device according to claim 1, characterized in that, The power module directly supplies power to the turbine.

7. A control method based on the safety control system of the respiratory support device according to any one of claims 1-6, characterized in that the steps are as follows: include: S1: The system is powered on and the control system is started; S2: Check the status of the algorithm processor and turbine control processor to determine if they are functioning correctly. S21: Both the algorithm processor and the turbine control processor are normal. The algorithm processor reads the user-set pressure value and calculates the pressure P required by the patient, and then sends it to the turbine control processor. The turbine control processor collects the pressure P1 from the mask pressure sensor and the pressure P2 from the outlet pressure sensor, respectively. S22: When the turbine control processor fails, the algorithm processor reads the user-set pressure value and calculates the pressure P required by the patient. The algorithm processor collects the pressure P1 from the mask pressure sensor. The algorithm processor controls the turbine and issues a fault alarm. S23: When the algorithm processor fails, the turbine control processor collects the pressure P1 from the mask pressure sensor, controls the turbine, and issues a fault alarm. S3: Under normal circumstances, compare the pressure P1 from the mask pressure sensor and the pressure P2 from the outlet pressure sensor collected by the turbine control processor to determine the feedback control quantity. S4: The turbine control processor controls the turbine output pressure P to supply gas to the patient; S5: The algorithm processor collects the turbine operating current I and compares it with the user-set value; if an abnormality occurs, the turbine control processor notifies the algorithm processor that the turbine has failed, the algorithm processor alarms to indicate the turbine failure, and prompts to connect compressed air to the high-pressure oxygen inlet to start the gas storage bag to supply gas.

8. The control method for a safety control system of a respiratory support device according to claim 7, characterized in that, The steps to determine the feedback control quantity are as follows: S31: If P1=P2, use the pressure P1 of the mask pressure sensor as the feedback control quantity. S32: If P1≠P2, the turbine control processor controls the turbine to increase power. The turbine control processor collects the pressure P1' from the mask pressure sensor and the pressure P2' from the outlet pressure sensor, respectively. Compare the values ​​of P1' and P1. If P1 = P1', it is determined that the mask pressure sensor is faulty, and the pressure P2 of the outlet pressure sensor is used as the feedback control quantity. If P1 ≠ P1', it is determined that the pressure of the outlet pressure sensor is faulty, and the pressure P1 of the mask pressure sensor is used as the feedback control quantity. Compare the values ​​of P2' and P2. If P2 = P2', it is determined that the pressure of the outlet pressure sensor is faulty, and the pressure of the mask pressure sensor P1 is used as the feedback control quantity. If P2 ≠ P2', it is determined that the mask pressure sensor is faulty, and the pressure of the outlet pressure sensor P2 is used as the feedback control quantity.

9. The control method for a safety control system of a respiratory support device according to claim 7, characterized in that, The steps to activate the airbag supply are as follows: S51: The algorithm processor controls the opening of the third switching valve and the closing of the first switching valve; S52: The algorithm processor controls the proportional valve, using the pressure P1 collected by the algorithm processor as the control quantity; S53: The algorithm processor controls the opening of the second switch valve, the closing of the third switch valve, and the acquisition of the pressure P3 from the oxygen pressure sensor; S54: Compare the pressure P3 collected by the oxygen pressure sensor with the set value. When P3 is greater than the set value, external gas is introduced, and the algorithm processor controls the opening of the second and third switching valves, and outputs pressure by controlling the proportional valve. When P3 is less than the set value, no external gas is connected. The algorithm processor controls the second switching valve to close and the third switching valve to open, and outputs pressure by controlling the proportional valve.

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