CN111603641A - Noninvasive ventilator-based alveolar ventilation monitoring system and control method - Google Patents
Noninvasive ventilator-based alveolar ventilation monitoring system and control method Download PDFInfo
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Abstract
The invention discloses an alveolar ventilation monitoring system and a control method based on a noninvasive ventilator, which comprises a ventilator body, a user breathing end, an MCU (microprogrammed control unit) and a display screen, wherein an air pressure electric adjusting module is arranged in the ventilator body, and the output end of the air pressure electric adjusting module is provided with a differential pressure type flow sensor and a first pressure sensor; atmospheric pressure electric control module, differential pressure type flow sensor and first pressure sensor all with MCU electric connection, differential pressure type flow sensor and first pressure sensor acquire the gas flow and the pressure of atmospheric pressure electric control module output respectively, MCU acquires differential pressure type flow sensor and first pressure sensor's detection data and shows through the display screen. The invention can monitor the respiratory state of the patient, intelligently compensate and adjust the airflow pressure according to the respiratory state of the patient, help the patient to keep the optimal respiratory state and provide powerful guarantee for the lung treatment of the patient.
Description
Technical Field
The invention belongs to the technical field of medical ventilator systems, and particularly relates to an alveolar ventilation monitoring system and a control method based on a noninvasive ventilator.
Background
In modern clinical medicine, a ventilator has been widely used in respiratory failure due to various reasons, anesthesia and breathing management during major surgery, respiratory support therapy and emergency resuscitation as an effective means for manually replacing the function of spontaneous ventilation, and has a very important position in the modern medical field. The breathing machine is a vital medical device which can prevent and treat respiratory failure, reduce complications and save and prolong the life of a patient.
Common signs of coronaviruses include respiratory symptoms, fever, cough, shortness of breath, dyspnea, and the like. In more severe cases, the infection can lead to pneumonia, severe acute respiratory syndrome, renal failure, and even death. There is currently no specific treatment for diseases caused by the novel coronavirus. However, many symptoms are treatable and therefore need to be treated according to the clinical condition of the patient.
In the treatment of the novel coronavirus, a severe patient cannot breathe spontaneously, and a breathing machine is required to maintain oxygen required by life, so that the breathing machine plays an important role in the treatment of the severe patient in the epidemic situation.
Providing the patient with the optimal breathing state can provide a double result with little effort for the patient's recovery. When the respiratory state of the patient is insufficient, the patient can lack oxygen, and the treatment is influenced; when the respiratory state of a patient is too high, secondary trauma of the lung can be caused, and the treatment of the patient is delayed; in addition, the turbulent airflow generated by existing ventilators may also cause secondary trauma to the patient.
In this regard, how to intelligently compensate and adjust the breathing state of the user by the ventilator is a technical problem that those skilled in the art are eagerly to solve.
Disclosure of Invention
The invention aims to solve the problems, and provides an alveolar ventilation monitoring system and a control method based on a noninvasive ventilator, which can monitor the respiratory state of a patient, intelligently compensate and adjust the airflow pressure according to the respiratory state of the patient, help the patient to maintain the optimal respiratory state, and provide powerful guarantee for the pulmonary therapy of the patient.
In order to realize the purpose, the invention adopts the technical scheme that: an alveolar ventilation monitoring system based on a noninvasive ventilator comprises a ventilator body, an MCU (microprogrammed control unit) and a user breathing end, wherein an air pressure electric adjusting module is arranged inside the ventilator body, the air inlet end of the air pressure electric adjusting module is connected with an air inlet, the output end of the air pressure electric adjusting module is connected with an airflow pressure buffering module, and the airflow output end of the airflow pressure buffering module is connected with the user breathing end; a differential pressure type flow sensor and a first pressure sensor are arranged in the respirator body and at the output end of the airflow pressure buffer module; the air pressure electric adjusting module, the differential pressure type flow sensor and the first pressure sensor are all electrically connected with the MCU. The pneumatic electric adjusting module can adopt the following patent numbers: the high-precision aeration flow control system provided in CN201610925331.5 may also adopt a mode of controlling air pressure by driving an impeller with a motor, and is not further limited in the present invention.
Differential pressure type flow sensor and first pressure sensor acquire the gas flow and the pressure of atmospheric pressure electric control module output respectively, and MCU acquires differential pressure type flow sensor and first pressure sensor's detection data and show through the display screen.
The invention can be directly connected with filtered air and oxygen, and has the specific structure that: the gas access port comprises an air access port and an oxygen access port, wherein the air access port is provided with filter cotton.
In order to show the breathing state of the user, the breathing control device further comprises a display screen for displaying parameters obtained by the breathing state of the user, and the display screen is electrically connected with the MCU.
The display screen is provided with a touch panel or an information input button, and information can be input and controlled in a touch or key pressing mode.
In order to realize remote control, the intelligent device further comprises a Bluetooth module used for establishing data connection with the intelligent device, and the Bluetooth module is electrically connected with the MCU.
In order to realize remote control, the remote control system further comprises a USB module used for establishing data connection with the intelligent equipment, and the USB module is electrically connected with the MCU.
In order to realize remote control, the remote control system further comprises a network module for establishing data connection with the intelligent equipment, and the network module is electrically connected with the MCU.
In order to realize remote control, the intelligent device adopts any one of a smart phone, a tablet computer and a computer.
It still includes the alarm that is used for the early warning to breathe unusually, the alarm with MCU electric connection. When the breathing machine detects that the breathing state of the user is abnormal, the alarm can be started and early-warning is carried out, so that the breathing safety of the user is ensured.
In order to detect the oxygen content and the air supply pressure of the breathing end of the user, the breathing machine further comprises an oxygen sensor and a second pressure sensor, wherein the oxygen sensor and the second pressure sensor are used for detecting the oxygen content and the air supply pressure of the breathing end of the user; the respirator foreign gas flow can be directly connected with the foreign gas flow connector after passing through the independent humidifier, the bacteria filter and other equipment, and the second pressure sensor detects the gas flow pressure input to the breathing end of the user by the respirator foreign gas flow. When the second pressure sensor detects that the external airflow of the respirator is blocked, the MCU controls the pressure of the airflow of the air pressure electric adjusting module in the respirator to perform pressure compensation, or controls the pressure of the external airflow of the respirator to perform pressure compensation through the connection of interfaces such as a USB (universal serial bus) and the like.
The breathing machine comprises a breathing machine body, and is characterized in that a silencing box, an airflow pressure buffering module and a pneumatic pressure adjusting module are arranged in the breathing machine body, wherein the airflow pressure buffering module is made of porous elastic materials, and a cavity for accommodating the pneumatic pressure adjusting module is arranged in the silencing box; the air pressure buffering module is internally provided with a bent air flow channel, and the air outlet end of the air pressure electric adjusting module in the silencing box is connected and communicated with the air flow channel. The noise that atmospheric pressure electric regulation module produced when moving is eliminated in the noise elimination box, and the air current that comes out through atmospheric pressure electric regulation module can make disorderly air current become more steady and comfortable in the back in the air current pressure die cushion piece, and patient can relax the symptom under the very serious condition of lung infection, reduces the wound that the disorder brought for the lung, breathes more soft and comfortable, alleviates patient's misery.
In order to improve the smooth effect of the output airflow, the material of the airflow pressure buffering module is preferably sponge.
The airflow channel sequentially comprises a first channel, a second channel and a third channel from the air inlet end to the air outlet end, wherein the first channel and the third channel are arranged in parallel, the second channel is perpendicular to the first channel and the third channel, and the joints of the second channel, the first channel and the third channel are in arc transition, so that the stable effect of output airflow is improved, and the comfort level is improved. And the air inlet end and the air outlet end of the air flow channel are respectively provided with a first pipeline joint and a second pipeline joint for connecting pipelines.
In order to realize connection and transition of the air outlet end of the air pressure electric adjusting module and the air flow channel in the air pressure buffering module, an air outlet joint is arranged on the shell of the silencing box, an air inlet connector matched with the air outlet end of the air pressure electric adjusting module is arranged at one end of the air outlet joint, an air outlet connector matched with the air flow channel is arranged at the other end of the air outlet joint, and the air outlet connector is connected and communicated with the first pipeline connector.
Under the condition that the air flow is stable without reducing the pressure, the pore sizes of the first channel, the second channel and the third channel are the same.
Under the condition that the air flow is stable without reducing the pressure, a conical transition channel for connecting an inner hole of the air inlet connector to the air flow channel in a penetrating way is arranged in the air outlet connector.
A control method of an alveolar ventilation monitoring system based on a noninvasive ventilator comprises the following steps: the height of the user can be input into the system, and the physiological dead space of the user can be estimated; detecting the flow of each breath through a differential pressure type flow sensor to obtain the tidal volume of each breath; using the value of tidal volume per breath-the value of physiological dead space = the value of alveolar ventilation; the numerical value of the alveolar ventilation is displayed in a display screen, so that the respiratory state of a user is accurately reflected; manually setting a range of values for a target alveolar ventilation in the system; when the value of the actual alveolar ventilation is lower than the minimum value of the target alveolar ventilation value, the system improves the respiratory pressure through the air pressure electric regulation module; when the value of the actual alveolar ventilation is higher than the maximum value of the target alveolar ventilation value, the system reduces the respiratory pressure through the air pressure electric regulation module; completing one adjustment of pressure increase or decrease in the fastest three respiratory cycles; one adjustment of the pressure increase or decrease is done for the fastest three breath cycles.
A control method of an alveolar ventilation monitoring system based on a noninvasive ventilator comprises the following steps: the weight of the user can be input into the system, the target tidal volume range of the user can be estimated, and the tidal volume of a normal person is 8-10 mL/kg; detecting the flow of each breath through a differential pressure type flow sensor to obtain the tidal volume of each breath; displaying the numerical value of the tidal volume in a display screen; manually setting a numerical range for a target tidal volume in the system; when the value of the actual tidal volume is lower than the minimum value of the target tidal volume value, the system improves the respiratory pressure through the air pressure electric adjusting module; when the value of the actual tidal volume is higher than the maximum value of the target tidal volume value, the system reduces the respiratory pressure through the air pressure electric regulation module; one adjustment of the pressure increase or decrease is done for the fastest three breath cycles.
The invention has the beneficial effects that: the ventilation intelligent compensation and adjustment respirator provided by the invention can monitor the respiratory state of a patient, intelligently compensate and adjust the airflow pressure according to the respiratory state of the patient, help the patient to keep the optimal respiratory state and provide powerful guarantee for the lung treatment of the patient.
The ventilation intelligent compensation and adjustment breathing machine provided by the invention has the advantages that the output airflow is stable, the comfort is strong, the secondary damage to the lung of a patient caused by airflow disorder can be avoided, and the patient can be helped to pass difficulty.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the muffler box and the airflow pressure buffering module according to the present invention.
Fig. 3 is a schematic cross-sectional view taken along line a-a in fig. 2.
FIG. 4 is a flowchart of the control method of example 1 using input height and alveolar ventilation.
Fig. 5 is a flowchart of the control method using the input weight and tidal volume ranges in embodiment 2.
FIG. 6 is a schematic representation of the change in relationship between height and physical dead space.
The text labels in the figures are represented as: 1. a ventilator body; 2. a sound attenuation box; 3. an air pressure electric adjusting module; 4. an airflow pressure buffer module; 5. a differential pressure flow sensor; 6. a first pressure sensor; 7. an oxygen sensor; 8. a user breathing end; 9. an external aid airflow nozzle; 10. a second pressure sensor; 11. a button; 12. an alarm; 13. MCU; 14. a display screen; 15. a Bluetooth module; 16. a USB module; 17. a network module; 18. an oxygen inlet; 19. an air inlet; 20. filtering cotton; 41. an air inlet connector; 42. a third channel; 43. a second pipe joint; 44. a second channel; 45. a first channel; 46. a first pipe joint; 47. a tapered transition passage; 48. an air outlet connecting nozzle; 49. and an air outlet joint.
Detailed Description
The following detailed description of the present invention is given for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the present description is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
Example 1:
as shown in fig. 1, the specific structure of the present invention is: an alveolar ventilation monitoring system based on a noninvasive ventilator comprises a ventilator body 1, an MCU13 and a user breathing end 8, wherein an air pressure electric adjusting module 3 is arranged inside the ventilator body 1, the air inlet end of the air pressure electric adjusting module 3 is connected with an air inlet, the output end of the air pressure electric adjusting module 3 is connected with an airflow pressure buffering module 4, and the airflow output end of the airflow pressure buffering module 4 is connected with the user breathing end 8; a differential pressure type flow sensor 5 and a first pressure sensor 6 are arranged in the respirator body 1 and at the output end of the airflow pressure buffer module 4; the pneumatic electric adjusting module 3, the differential pressure type flow sensor 5 and the first pressure sensor 6 are all electrically connected with the MCU 13.
In the present embodiment, as shown in fig. 1, the differential pressure type flow sensor 5 and the first pressure sensor 6 respectively obtain the gas flow and the pressure output by the pneumatic electric adjustment module 3, and the MCU13 obtains the detection data of the differential pressure type flow sensor 5 and the first pressure sensor 6 and displays the detection data through the display 14.
In this embodiment, as shown in fig. 1, the present invention can be directly connected to filtered air, or can be connected to oxygen, and the specific structure is as follows: the gas inlet comprises an air inlet 19 and an oxygen inlet 18, wherein the air inlet 19 is provided with filter cotton 20.
In this embodiment, as shown in fig. 1, in order to show the breathing state of the user, the device further includes a display 14 for displaying the acquired parameter of the breathing state of the user, and the display 14 is electrically connected to the MCU. The display screen 14 is provided with a touch panel or an information input button 11, and information can be input and controlled by touching or pressing a key.
In this embodiment, as shown in fig. 1, in order to implement remote control, the remote control system further includes a bluetooth module 15, a USB module 16 and a network module 17, which are used for establishing data connection with the intelligent device, and the bluetooth module 15, the USB module 16 and the network module 17 are all electrically connected to the MCU. The intelligent device adopts any one of a smart phone, a tablet computer and a computer.
In this embodiment, as shown in fig. 1, it further includes an alarm 12 for warning about respiratory abnormality, and the alarm 12 is electrically connected to the MCU. When the breathing machine detects that the breathing state of the user is abnormal, the alarm 12 is started and performs early warning to ensure the breathing safety of the user.
In this embodiment, as shown in fig. 1, in order to detect the oxygen content and the air supply pressure at the breathing end of the user, the breathing apparatus further comprises an oxygen sensor 7 and a second pressure sensor 10 for detecting the oxygen content and the air supply pressure at the breathing end of the user, the second pressure sensor 10 is installed outside the breathing apparatus body 1, a passageway between the air output of the breathing apparatus body 1 and the breathing end 8 of the user is provided with an external aid air flow connector 9, and the second pressure sensor 10 is connected with the external aid air flow connector 9; after the external air flow of the respirator passes through the independent humidifier, the bacteria filter and other equipment, the external air flow can be directly connected with the external air flow connector 9, and the second pressure sensor 10 detects the air flow pressure input by the external air flow of the respirator to the breathing end 8 of the user. When the second pressure sensor 10 detects that the external airflow of the respirator is blocked, the MCU controls the pressure of the airflow of the air pressure electric adjusting module 3 in the respirator to perform pressure compensation, or controls the pressure of the external airflow of the respirator to perform pressure compensation through the connection of interfaces such as a USB (universal serial bus) and the like.
In this embodiment, as shown in fig. 2-3, a sound attenuation box 2, an airflow pressure buffer module 4 and a pneumatic electric adjustment module 3 are arranged inside a ventilator body 1, wherein the airflow pressure buffer module 4 is made of a porous elastic material, and a chamber for accommodating the pneumatic electric adjustment module 3 is arranged inside the sound attenuation box 2; a bent air flow channel is arranged in the air flow pressure buffer module 4, and the air outlet end of the air pressure electric adjusting module 3 in the silencing box 2 is communicated with the air flow channel. The noise that atmospheric pressure electric regulation module 3 produced when the operation is eliminated in noise elimination box 2, and the air current that comes out through atmospheric pressure electric regulation module 3 back in air current pressure buffer module 4, can make disorderly air current become more steady and comfortable, and patient can the symptom of releiving under the very serious condition of lung infection, reduces the wound that the disorder brought for the lung, breathes more soft and comfortable, alleviates patient's misery.
In the present embodiment, as shown in fig. 3, in order to improve the smooth effect of the output airflow, the material of the airflow pressure buffering module 4 is preferably sponge.
In this embodiment, as shown in fig. 3, the airflow channel sequentially includes a first channel 45, a second channel 44, and a third channel 42 from the air inlet end to the air outlet end, where the first channel 45 and the third channel 42 are arranged in parallel, the second channel 44 is perpendicular to the first channel 45 and the third channel 42, and a joint between the second channel 44 and the first channel 45 and the third channel 42 passes through an arc transition, so as to improve a smooth effect of an output airflow and improve comfort. The air inlet end and the air outlet end of the air flow channel are respectively provided with a first pipeline joint 46 and a second pipeline joint 43 for connecting pipelines.
In this embodiment, as shown in fig. 3, in order to connect and transition the air outlet end of the pneumatic electric adjusting module 3 with the air flow passage in the air flow pressure buffering module 4, an air outlet joint 49 is disposed on the housing of the sound attenuation box 2, an air inlet joint 41 matched with the air outlet end of the pneumatic electric adjusting module 3 is disposed at one end of the air outlet joint 49, an air outlet joint 48 matched with the air flow passage is disposed at the other end of the air outlet joint 49, and the air outlet joint 48 is connected to and communicated with the first pipeline joint 46.
In the present embodiment, as shown in fig. 3, the first passage 45, the second passage 44, and the third passage 42 have the same pore size without reducing the pressure to smooth the gas flow.
In the present embodiment, as shown in fig. 3, a tapered transition passage 47 for connecting the inner hole of the inlet nipple 41 to the air flow passage is provided in the outlet nipple 48 without reducing the pressure to smooth the air flow.
A control method of an alveolar ventilation monitoring system based on a noninvasive ventilator comprises the following steps: the height of the user can be input into the system, and the physiological dead space of the user can be estimated; detecting the flow of each breath through a differential pressure type flow sensor 5 to obtain the tidal volume of each breath; using the value of tidal volume per breath-the value of physiological dead space = the value of alveolar ventilation; the numerical value of the alveolar ventilation is displayed in a display screen, so that the respiratory state of a user is accurately reflected; manually setting a range of values for a target alveolar ventilation in the system; when the value of the actual alveolar ventilation is lower than the minimum value of the target alveolar ventilation value, the system improves the respiratory pressure through the air pressure electric regulation module 3; when the value of the actual alveolar ventilation is higher than the maximum value of the target alveolar ventilation value, the system reduces the respiratory pressure through the air pressure electric regulation module 3; completing one adjustment of pressure increase or decrease in the fastest three respiratory cycles; one adjustment of the pressure increase or decrease is done for the fastest three breath cycles.
Example 2:
in this embodiment, as shown in fig. 1, the specific structure of the present invention is: the breathing machine comprises a breathing machine body 1, an MCU13 and a user breathing end 8, wherein an air pressure electric adjusting module 3 is arranged inside the breathing machine body 1, the air inlet end of the air pressure electric adjusting module 3 is connected with an air inlet, the output end of the air pressure electric adjusting module 3 is connected with an airflow pressure buffering module 4, and the airflow output end of the airflow pressure buffering module 4 is connected with the user breathing end 8; a differential pressure type flow sensor 5 and a first pressure sensor 6 are arranged in the respirator body 1 and at the output end of the airflow pressure buffer module 4; the pneumatic electric adjusting module 3, the differential pressure type flow sensor 5 and the first pressure sensor 6 are all electrically connected with the MCU 13.
In the present embodiment, as shown in fig. 1, the differential pressure type flow sensor 5 and the first pressure sensor 6 respectively obtain the gas flow and the pressure output by the pneumatic electric adjustment module 3, and the MCU13 obtains the detection data of the differential pressure type flow sensor 5 and the first pressure sensor 6 and displays the detection data through the display 14.
In this embodiment, as shown in fig. 1, the present invention can be directly connected to filtered air, or can be connected to oxygen, and the specific structure is as follows: the gas inlet comprises an air inlet 19 and an oxygen inlet 18, wherein the air inlet 19 is provided with filter cotton 20.
In this embodiment, as shown in fig. 1, in order to show the breathing state of the user, the device further includes a display 14 for displaying the acquired parameter of the breathing state of the user, and the display 14 is electrically connected to the MCU. The display screen 14 is provided with a touch panel or an information input button 11, and information can be input and controlled by touching or pressing a key.
In this embodiment, as shown in fig. 1, in order to implement remote control, the remote control system further includes a bluetooth module 15, a USB module 16 and a network module 17, which are used for establishing data connection with the intelligent device, and the bluetooth module 15, the USB module 16 and the network module 17 are all electrically connected to the MCU. The intelligent device adopts any one of a smart phone, a tablet computer and a computer.
In this embodiment, as shown in fig. 1, it further includes an alarm 12 for warning about respiratory abnormality, and the alarm 12 is electrically connected to the MCU. When the breathing machine detects that the breathing state of the user is abnormal, the alarm 12 is started and performs early warning to ensure the breathing safety of the user.
In this embodiment, as shown in fig. 1, in order to detect the oxygen content and the air supply pressure at the breathing end of the user, the breathing apparatus further comprises an oxygen sensor 7 and a second pressure sensor 10 for detecting the oxygen content and the air supply pressure at the breathing end of the user, the second pressure sensor 10 is installed outside the breathing apparatus body 1, a passageway between the air output of the breathing apparatus body 1 and the breathing end 8 of the user is provided with an external aid air flow connector 9, and the second pressure sensor 10 is connected with the external aid air flow connector 9; after the external air flow of the respirator passes through the independent humidifier, the bacteria filter and other equipment, the external air flow can be directly connected with the external air flow connector 9, and the second pressure sensor 10 detects the air flow pressure input by the external air flow of the respirator to the breathing end 8 of the user. When the second pressure sensor 10 detects that the external airflow of the respirator is blocked, the MCU controls the pressure of the airflow of the air pressure electric adjusting module 3 in the respirator to perform pressure compensation, or controls the pressure of the external airflow of the respirator to perform pressure compensation through the connection of interfaces such as a USB (universal serial bus) and the like.
In this embodiment, as shown in fig. 2-3, a sound attenuation box 2, an airflow pressure buffer module 4 and a pneumatic electric adjustment module 3 are arranged inside a ventilator body 1, wherein the airflow pressure buffer module 4 is made of a porous elastic material, and a chamber for accommodating the pneumatic electric adjustment module 3 is arranged inside the sound attenuation box 2; a bent air flow channel is arranged in the air flow pressure buffer module 4, and the air outlet end of the air pressure electric adjusting module 3 in the silencing box 2 is communicated with the air flow channel. The noise that atmospheric pressure electric regulation module 3 produced when the operation is eliminated in noise elimination box 2, and the air current that comes out through atmospheric pressure electric regulation module 3 back in air current pressure buffer module 4, can make disorderly air current become more steady and comfortable, and patient can the symptom of releiving under the very serious condition of lung infection, reduces the wound that the disorder brought for the lung, breathes more soft and comfortable, alleviates patient's misery.
In the present embodiment, as shown in fig. 3, in order to improve the smooth effect of the output airflow, the material of the airflow pressure buffering module 4 is preferably sponge.
In this embodiment, as shown in fig. 3, the airflow channel sequentially includes a first channel 45, a second channel 44, and a third channel 42 from the air inlet end to the air outlet end, where the first channel 45 and the third channel 42 are arranged in parallel, the second channel 44 is perpendicular to the first channel 45 and the third channel 42, and a joint between the second channel 44 and the first channel 45 and the third channel 42 passes through an arc transition, so as to improve a smooth effect of an output airflow and improve comfort. The air inlet end and the air outlet end of the air flow channel are respectively provided with a first pipeline joint 46 and a second pipeline joint 43 for connecting pipelines.
In this embodiment, as shown in fig. 3, in order to connect and transition the air outlet end of the pneumatic electric adjusting module 3 with the air flow passage in the air flow pressure buffering module 4, an air outlet joint 49 is disposed on the housing of the sound attenuation box 2, an air inlet joint 41 matched with the air outlet end of the pneumatic electric adjusting module 3 is disposed at one end of the air outlet joint 49, an air outlet joint 48 matched with the air flow passage is disposed at the other end of the air outlet joint 49, and the air outlet joint 48 is connected to and communicated with the first pipeline joint 46.
In the present embodiment, as shown in fig. 3, the first passage 45, the second passage 44, and the third passage 42 have the same pore size without reducing the pressure to smooth the gas flow.
In the present embodiment, as shown in fig. 3, a tapered transition passage 47 for connecting the inner hole of the inlet nipple 41 to the air flow passage is provided in the outlet nipple 48 without reducing the pressure to smooth the air flow.
A control method of an alveolar ventilation monitoring system based on a noninvasive ventilator comprises the following steps: the weight of the user can be input into the system, the target tidal volume range of the user can be estimated, and the tidal volume of a normal person is 8-10 mL/kg; detecting the flow of each breath through a differential pressure type flow sensor 5 to obtain the tidal volume of each breath; the value of tidal volume is displayed in the display screen 14; manually setting a numerical range for a target tidal volume in the system; when the value of the actual tidal volume is lower than the minimum value of the target tidal volume value, the system improves the respiratory pressure through the air pressure electric adjusting module 3; when the actual tidal volume value is higher than the maximum value of the target tidal volume value, the system reduces the respiratory pressure through the air pressure electric adjusting module 3; one adjustment of the pressure increase or decrease is done for the fastest three breath cycles.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (8)
1. An alveolar ventilation monitoring system based on a noninvasive ventilator is characterized by comprising a ventilator body (1), a user breathing end (8), an MCU (14) and a display screen (14) for displaying parameters obtained by the breathing state of a user, wherein an air pressure electric adjusting module (3) is arranged inside the ventilator body (1), and the output end of the air pressure electric adjusting module (3) is provided with a differential pressure type flow sensor (5) and a first pressure sensor (6); atmospheric pressure electric control module (3), differential pressure type flow sensor (5) and first pressure sensor (6) all with MCU (14) electric connection, differential pressure type flow sensor (5) and first pressure sensor (6) acquire the gas flow and the pressure of atmospheric pressure electric control module (3) output respectively, MCU (14) acquire the detection data of differential pressure type flow sensor (5) and first pressure sensor (6) and show through display screen (14).
2. The alveolar ventilation monitoring system based on the noninvasive ventilator of claim 1, wherein the display screen (14) is provided with a touch panel or a button (1) for information input.
3. A noninvasive ventilator-based alveolar ventilation monitoring system according to claim 1, further comprising a bluetooth module (15), a network module (17) and a USB module (16) for establishing connection with a smart device, wherein the monitoring system can be remotely observed and operated by the smart device.
4. The noninvasive ventilator-based alveolar ventilation monitoring system of claim 3, wherein the smart device is any one of a smartphone, a tablet and a computer.
5. A method of controlling a monitoring system according to any of claims 1-4, characterized in that the height of the user is entered in the system and the physiological dead space of the user is estimated; detecting the flow of each breath through a differential pressure type flow sensor (5) to obtain the tidal volume of each breath; using the value of tidal volume per breath-the value of physiological dead space = the value of alveolar ventilation; the value of alveolar ventilation is displayed on a display screen (14), so that the respiratory state of the user can be accurately reflected; manually setting a range of values for a target alveolar ventilation in the system;
when the value of the actual alveolar ventilation is lower than the minimum value of the target alveolar ventilation value, the system improves the respiratory pressure through the air pressure electric regulation module (3);
when the value of the actual alveolar ventilation is higher than the maximum value of the target alveolar ventilation value, the system reduces the respiratory pressure through the air pressure electric regulation module (3); one adjustment of the pressure increase or decrease is done for the fastest three breath cycles.
6. A control method of a monitoring system according to any of claims 1-4, characterized in that it comprises the steps of: inputting the weight of the user in the system, and estimating a target tidal volume range of the user; detecting the flow of each breath through a differential pressure type flow sensor (5) to obtain the tidal volume of each breath; the numerical value of the tidal volume is displayed in a display screen (14); manually setting a numerical range for a target tidal volume in the system;
when the value of the actual tidal volume is lower than the lowest value of the target tidal volume value, the system improves the respiratory pressure through the air pressure electric adjusting module (3);
when the value of the actual tidal volume is higher than the maximum value of the target tidal volume value, the system reduces the respiratory pressure through the air pressure electric regulation module (3).
7. Control method of a monitoring system according to claim 5, characterized in that one adjustment of the pressure increase or decrease is done for the fastest three breath cycles.
8. Control method of a monitoring system according to claim 6, characterized in that one adjustment of the pressure increase or decrease is done for the fastest three breath cycles.
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| CN113117199A (en) * | 2021-04-19 | 2021-07-16 | 合肥康居人智能科技有限公司 | Noninvasive ventilator control system |
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