CN111142599A - Humidification amount control system and method for respiratory support equipment and respiratory support equipment - Google Patents
Humidification amount control system and method for respiratory support equipment and respiratory support equipment Download PDFInfo
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- CN111142599A CN111142599A CN201911405778.XA CN201911405778A CN111142599A CN 111142599 A CN111142599 A CN 111142599A CN 201911405778 A CN201911405778 A CN 201911405778A CN 111142599 A CN111142599 A CN 111142599A
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
Abstract
The invention relates to a humidification amount control system and method of a respiratory support device and the respiratory support device. A humidification amount control system of a respiratory support device comprises a controller, a turbine, an air outlet temperature sensor, a heating plate, a humidification water box, a heating driver and a power supply; the turbine has a turbine outlet; the humidifying water box is provided with a humidifying air inlet and a humidifying air outlet; the turbine air outlet is connected with the humidification air inlet through a pipeline; the heating plate is arranged at the bottom of the humidifying water box; the air outlet temperature sensor is arranged at the humidifying air outlet; the heating plate temperature sensor is arranged on the heating plate. The invention carries out real-time feedback and adjustment on the heating power of the heating plate by monitoring the temperature of the heating plate and the temperature of the air outlet of the air passage in real time in the treatment and use process of a patient, thereby controlling the temperature of the heating plate and effectively controlling the humidification quantity of the respiratory support equipment.
Description
Technical Field
The invention relates to the field of humidification control of respiratory support equipment, in particular to a system and a method for controlling the humidification amount of the respiratory support equipment and the respiratory support equipment.
Background
The respiratory support technology is an important means for treating respiratory failure, and Nasal High-Flow oxygen humidification therapy (High-Flow oxygen therapy, High-Flow Nasal canula, HFNC) is a novel respiratory support technology, gas humidified by warming is transmitted through a Nasal High-Flow oxygen therapy instrument, the Flow is 30-60L/Min or more, the purposes of transmitting oxygen with stable concentration, flushing upper airway dead space and generating certain positive end-expiratory airway pressure are achieved, and meanwhile, the tolerance of a patient is good.
The current high-flow oxygen therapy instrument products are mainly medical products, and for some patients with lighter symptoms, hospitalization can generate high cost and occupy unnecessary medical resources, so that the household high-flow humidification oxygen therapy instrument is a direction and a trend of the market and can serve more and more household customers.
For a household high-flow humidification oxygen therapy instrument, the humidification capability is an important performance index, and in the whole using process, if the humidification capability is insufficient, the using effect of a patient can be influenced, and the mouth and the tongue of the patient can be dry, so that the discomfort of the patient is caused. If the humidifying capacity is excessive, water in the pipeline is blown out, discomfort of a patient is caused, and other potential safety hazards are caused. Therefore, the reasonable humidifying capability is an important standard for judging the household high-flow humidifying oxygen therapy instrument.
Present high flow humidifying oxygen therapy appearance is mostly all medical machine in the market, medical machine is in the detection to the water level with the domestic machine still there is very big difference, the humidification water box of medical machine is generally less, and add water in real time through hanging the water bag in the use, guarantee the humidification volume, and for medical machine, the humidifier water box of domestic machine will be bigger, just so can the disposable longer time of use, so to domestic high flow humidifying oxygen therapy appearance, the humidification volume control of humidification water box is just more difficult some relatively.
At present, products and technologies in the market are mostly control schemes of a respirator humidifier, and a control scheme about humidification of a water box of a household high-flow humidification oxygen therapy instrument is not provided. Such as CN108273174A, the control of the hardware part is more emphasized. Like CN107812294A, the focus is on the transmission portion of the ventilator humidifier data. For example, CN107812294A and CN206526357U, the design and use of the structure are more important.
Thus, existing respiratory support devices are deficient and have yet to be improved and enhanced.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a humidification amount control system and method of a respiratory support device and the respiratory support device, which can control the humidification amount of the respiratory support device within a required range in real time and improve the user experience.
In order to achieve the purpose, the invention adopts the following technical scheme:
a humidification amount control system of a respiratory support device comprises a controller, a turbine, an air outlet temperature sensor, a heating plate, a humidification water box, a heating driver and a power supply; the turbine has a turbine outlet; the humidifying water box is provided with a humidifying air inlet and a humidifying air outlet; the turbine air outlet is connected with the humidification air inlet through a pipeline; the heating plate is arranged at the bottom of the humidifying water box; the air outlet temperature sensor is arranged at the humidifying air outlet; the heating plate temperature sensor is arranged on the heating plate; the controller is respectively connected with the turbine, the heating driver, the air outlet temperature sensor and the heating plate temperature sensor; the heating plate is connected with the heating driver; the power supply is used for supplying power to the controller, the turbine and the heating driver.
Preferably, the humidification quantity control system of the respiratory support equipment further comprises a setting unit connected with the controller and used for setting a temperature set value of an air outlet of the humidification water box and a flow set value of the output gas of the turbine.
Preferably, the humidification amount control system of the respiratory support device, the heating driver is a PWM driver, and is configured to control the heating power of the heating plate according to an instruction of the controller.
A method of controlling humidification of a respiratory support device using the control system, comprising the steps of:
s1, the heating driver operates the heating plate at the initial power and preheats for a first preset time;
s2, detecting a gas outlet detection temperature value of the humidification gas outlet by a gas outlet temperature sensor, detecting a heating plate detection temperature value of a heating plate by a heating plate temperature sensor, and respectively transmitting the gas outlet detection temperature value and the heating plate detection temperature value to a controller;
s3, the controller judges whether the air outlet detection temperature value is smaller than a first air outlet temperature threshold value, if so, the step S4 is executed; if not, go to step S5;
s4, the controller judges whether the detected temperature of the heating plate is smaller than the temperature threshold of the heating plate, if so, the controller controls the heating plate to operate at a first power, and the step S2 is executed; if not, the controller controls the heating plate to operate at the second power, and step S2 is executed;
s5, the controller judges whether the air outlet detection temperature value is smaller than a second air outlet temperature threshold value, if so, the step S6 is executed; if not, the controller controls the heating plate to operate at a fifth power, and step S2 is executed;
s6, the controller judges whether the detected temperature of the heating plate is smaller than the temperature threshold of the heating plate, if so, the heating plate is controlled to operate at a third power, and the step S2 is executed; if not, the heating plate is controlled to operate at the fourth power, and step S2 is executed.
Preferably, before the step S1, the method for controlling the humidification amount of the respiratory support apparatus further includes:
s0, setting a temperature set value of an air outlet of the humidifying water box and a flow set value of turbine output gas; the controller matches a heating plate temperature threshold value in a heating plate temperature control meter according to the temperature setting and the flow setting value; the controller drives the turbine to output a gas flow at the flow set point.
Preferably, in the humidification amount control method for respiratory support equipment, the first outlet temperature threshold is obtained by subtracting a preset temperature value from the outlet temperature set value;
and the second air outlet temperature threshold value is obtained by adding a preset temperature value to the set air outlet temperature value.
Preferably, the preset value is 0.3-0.8 ℃.
Preferably, in the method for controlling the humidification amount of the respiratory support device, the heating plate temperature threshold is obtained by the following steps:
s01, the controller judges whether the set value of the air outlet temperature is larger than a set temperature threshold value, if so, the step S02 is executed; if not, the heating plate temperature threshold value is a primary fixed value in the heating plate temperature control table;
s02, the heating plate temperature threshold is obtained through the following formula:
TJY＝TCG+a(TCSD-TSY)；
wherein, TJYIs the heater plate temperature threshold; t isCGIs the primary fixed value; t isCSDIs the set value of the air outlet temperature; t isSYIs the set temperature threshold; a is a set constant.
Preferably, in the humidification quantity control method for the respiratory support equipment, the set temperature value of the air outlet is set to be within the range of 31-37 ℃; the range of the flow set value is 10-60L/Min.
A respiratory support apparatus uses the control system.
Compared with the prior art, the humidification amount control system and method for the respiratory support equipment and the respiratory support equipment provided by the invention have the advantages that the temperature of the heating plate and the temperature of the air outlet of the air passage are monitored in real time in the treatment and use process of a patient, the heating power of the heating plate is fed back and adjusted in real time, and the temperature of the heating plate is further controlled, so that the humidification amount of the respiratory support equipment is effectively controlled, the use requirement of the patient is met, and a better treatment effect is achieved.
Drawings
FIG. 1 is a block diagram of a humidification amount control system for a respiratory support apparatus according to the present invention;
FIG. 2 is a block diagram of a humidification control system for a respiratory support apparatus according to the present invention;
fig. 3 is a flow chart of a method for controlling the humidification amount of a respiratory support device provided by the invention.
PWM (Pulse width modulation)
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Referring to fig. 1-3 together, the arrows in fig. 2 show the air flow direction, the present invention provides a humidification amount control system for a respiratory support apparatus, which includes a controller 1, a turbine 2, an outlet temperature sensor 3, a heating plate temperature sensor 4, a heating plate 5, a humidification water box 8, a heating driver 6 and a power supply 7; the turbine 2 has a turbine outlet; the humidifying water box 8 is provided with a humidifying air inlet and a humidifying air outlet; the turbine air outlet is connected with the humidification air inlet through a pipeline; the heating plate 5 is arranged at the bottom of the humidifying water box 8; the air outlet temperature sensor 3 is arranged at the humidification air outlet; the heating plate temperature sensor 4 is arranged on the heating plate 5; the controller 1 is respectively connected with the turbine 2, the heating driver 6, the air outlet temperature sensor 3 and the heating plate temperature sensor 4; the heating plate 5 is connected with the heating driver 6; the power supply 7 is used for supplying power to the controller 1, the turbine 2 and the heating driver 6.
Specifically, in the control system provided by the present invention, the controller 1 is a processing chip commonly used in the art, and a general MCU (micro controller Unit) can be implemented, which is not specifically limited in the present invention; the turbine 2 is a common device in the field, can output airflow determined according to the output flow of the controller 1, and can feed back the flow value of the airflow to the controller 1, and the type of the turbine is not limited in the invention; the dimensions of the humidifying water box 8 are the dimensions commonly used in the art for domestic breathing support equipment, the invention is not limited, and the above technical solution can be realized, the material used is preferably plastic, and the humidifying water box can be harmless at a certain temperature, for example, no harmful substance can be generated at a temperature above 200 ℃ for a long time, and it should be understood that the plastic material can not generate harmful substances at a temperature above 200 ℃ and not generate harmful substances at a temperature below 200 ℃.
Correspondingly, the invention also provides a humidification quantity control method of the respiratory support equipment of the control system, which comprises the following steps:
s1, the heating driver 6 operates the heating plate 5 with the initial power, preheating for a first predetermined time; specifically, the first preset time is 3-5Min, and the preferable scheme is 3 Min; the purpose of operating the heating plate 5 at the initial frequency is to protect the system;
s2, detecting an air outlet detection temperature value of the humidification air outlet by an air outlet temperature sensor 3, detecting a heating plate detection temperature value of the heating plate 5 by a heating plate temperature sensor 4, and respectively transmitting the air outlet detection temperature value and the heating plate detection temperature value to a controller 1;
s3, the controller 1 judges whether the air outlet detection temperature value is smaller than a first air outlet temperature threshold value, if so, the step S4 is executed; if not, go to step S5;
s4, the controller 1 judges whether the detected temperature of the heating plate is smaller than the temperature threshold of the heating plate, if so, the controller 1 controls the heating plate 5 to operate at a first power, and executes the step S2; if not, the controller 1 controls the heating plate 5 to operate at the second power, and performs step S2;
s5, the controller 1 judges whether the air outlet detection temperature value is smaller than a second air outlet temperature threshold value, if yes, the step S6 is executed; if not, the controller 1 controls the heating plate 5 to operate at a fifth power, and performs step S2;
s6, the controller 1 judges whether the detected temperature of the heating plate is smaller than the temperature threshold of the heating plate, if so, the heating plate 5 is controlled to operate at a third power, and the step S2 is executed; if not, the heating plate 5 is controlled to operate at the fourth power, and step S2 is executed. Specifically, in the above steps S4, S5, and S6, no matter which power the heater plate 5 is operated, the step S2 is required to be executed in order to obtain the detected temperature value of the air outlet in real time and to feed back data in real time, thereby achieving the effect of controlling the amount of humidification in real time.
Preferably, the present embodiment further comprises a setting unit, connected to the controller 1, for setting a set value of the outlet temperature of the humidified water box 8 and a set value of the flow rate of the gas output from the turbine 2. Specifically, the setting unit is configured to set an initial value, and in the present invention, the setting unit is mainly configured to determine, by the controller 1, demand data in the current operation of the respiratory support apparatus, where the demand data includes the air outlet temperature set value and the flow set value.
As a preferred scheme, the control system has a gear setting function, and generally can be divided into 3 or 5 or 7 gears, and the preferred scheme is to set 3 gears, which can be called as low, medium and high gears, and the air outlet temperature thresholds of the high, medium and low gears are different, wherein the air outlet temperature threshold of the medium gear is the air outlet temperature set value, the air outlet temperature threshold of the high gear is the air outlet temperature set value plus 2 ℃, and the air outlet temperature threshold of the block is the air outlet temperature set value minus 2 ℃. If the gears are 5, the gears can be called 1, 2, 3, 4 and 5, the set value of the air outlet temperature is the air outlet temperature threshold value of the gear 3 in the middle gear, and the difference between adjacent gears in other gears is 1 ℃ or 2 ℃, so that the invention is not limited. Similarly, when the number of the gears is 7, the setting is the same, and the description is omitted here.
As a preferable solution, in this embodiment, before the step S1, the method further includes:
s0, setting a set value of the temperature of the air outlet of the humidifying water box 8 and a set value of the flow rate of the gas output by the turbine 2; the controller 1 matches a heating plate temperature threshold value in a heating plate temperature control meter according to the temperature setting and the flow setting value; the controller 1 drives the turbine 2 to output the airflow at the flow set point.
Specifically, the controller 1 may be a general processor chip or an MCU, and may be provided with a certain memory, such as a FLASH memory, the heating plate temperature control table is stored in a memory built in the controller 1, and the invention is not limited thereto.
As a preferable scheme, in this embodiment, the heating plate temperature control table is obtained by comprehensively taking the heating plate temperature threshold value with the best temperature control effect under a single requirement, under the condition that the respiratory support device is operated for multiple times according to different requirements and the heating plate 5 is set at different heating plate temperature threshold values; the requirements include a set value for the outlet temperature of the humidified water box 8 and a set value for the flow of gas output by the turbine 2.
Preferably, in this embodiment, the heating plate temperature threshold is obtained by:
s01, the controller 1 judges whether the set value of the air outlet temperature is larger than a set temperature threshold value, if so, the step S02 is executed; if not, the heating plate temperature threshold value is a primary fixed value in the heating plate temperature control table; the set temperature threshold is a set value used for judging the set value of the temperature of the air outlet, and is set according to the specific running condition of the respiratory support equipment, the invention is not particularly limited, and the preferred scheme is set to be 33 ℃;
s02, the heating plate temperature threshold is obtained through the following formula:
TJY＝TCG+a(TCSD-TSY)；
wherein, TJYIs the heater plate temperature threshold; t isCGIs the primary fixed value; t isCSDIs the set value of the air outlet temperature; t isSYIs the set temperature threshold; a is a set constant. The primary fixed value is a value determined for a single demand data instance, such as 85 ℃. The setting constant is set according to the specific operation condition of different respiratory support equipment, and is generally 3 or 4, and as for other values, the equipment is determined according to the actual operation condition, and the invention is not limited.
Preferably, in this embodiment, the set value of the outlet temperature is set to range from 31 to 37 ℃; the range of the flow set value is 10-60L/Min. Specifically, in the case of the above data, the user's feeling is better.
Setting the set temperature threshold value to be 33 ℃, the value range of the air outlet temperature set value to be 31-37 ℃, the value range of the flow set value to be 10-60L/Min, the breathing support equipment to be a high-flow humidifying oxygen therapy instrument with the model of OH-39, and in the above case, the set constants to be 3 and 4 respectively, and in the specific case, please refer to the following table, and the temperature control table of the heating plate is shown as the following table:
preferably, in this embodiment, the first air outlet temperature threshold is obtained by subtracting a predetermined temperature value from the set air outlet temperature value;
and the second air outlet temperature threshold value is obtained by adding a preset temperature value to the set air outlet temperature value.
Preferably, in the present embodiment, the predetermined value is 0.3 to 0.8 ℃.
Preferably, in this embodiment, the heating driver 6 is a PWM driver, and is configured to control the heating power of the heating plate 5 according to the instruction of the controller 1. The driving principle of the PWM driver is that the controller 1 sends a control signal to drive the heating plate 5 and the power supply 7 to control the heating plate 5 to heat at different running powers according to different on-off ratios in unit time, and the control signal comprises the on-off ratios.
Preferably, in this embodiment, the initial power is 20% of the rated power; the first power is 95% of rated power; the second power is 80% of rated power; the third power is 40% of rated power; the fourth power is 30% of rated power; the fifth power is 10% of the rated power.
Specifically, the operating power is determined in proportion to a rated power, and the rated power is used for connecting the heating plate 5100% with the power supply 7 in unit time. For example, the operating power is 50%, i.e. 50% of the time between the heating plate 5 and the power supply 7 per unit of time is on and 50% of the time is off. The unit time is 1 s.
Preferably, in this embodiment, when the detected temperature value of the heating plate 5 is greater than or equal to 130 ℃, the heating driver 6 is controlled to be turned off, so as to stop heating and prevent the heating wire from being fused.
Example 2
The invention provides a breathing support device, using the control system. Of course, in the actual operation process, the operation control is also carried out in cooperation with the detection method.
Specifically, respiratory support device still includes external pipeline, turbine 2 still includes the turbine air inlet, external pipeline includes: the oxygen pipeline and the air pipeline are connected with the turbine air inlet, the heating pipe is connected with the air outlet of the humidifying water box 8, and the nasal oxygen tube is connected with the heating pipe and is connected into the nostril of a user. After being mixed, the air and the oxygen enter the humidifying water box 8 after passing through the turbine 2, the heating plate is continuously heated to take away a part of water vapor, and then the water vapor is supplied to a user through the heating pipe and the nasal oxygen tube.
The set value of the temperature of the air outlet is set to be 31 ℃, the set value of the flow is set to be 40L/Min, after the treatment is started, the heating plate 5 is driven to preheat for 3 minutes by taking the running power as 20 percent of the rated power, and the heating plate 5 is prevented from being damaged by heating with high power right from the beginning. Then monitoring the air outlet detection temperature value of the airflow at the humidification air outlet in real time through the air outlet temperature sensor: (1) when the detected temperature value of the air outlet is monitored to be less than 30.5 ℃, if the detected temperature value of the heating plate at the position of the heating plate 5 is less than 100 ℃, the heating plate 5 is heated with high power of 95 percent, and when the detected temperature value of the heating plate is more than 100 ℃ but the temperature of the air outlet is still less than 30.5 ℃, the operation power of the heating plate 5 is reduced to 75 percent for heating, so that the temperature of the air outlet can be in a continuous rising stage and the temperature of the heating plate 5 is prevented from being overhigh; (2) when the detected temperature value of the air outlet is monitored to be greater than 30.5 ℃ and less than 31.5 ℃, if the monitored value of the temperature sensor at the heating plate 5 is less than 100 ℃, the heating plate 5 is heated by 40% of operating power, and when the temperature of the heating plate 5 is greater than 100 ℃ but the temperature of the air outlet is still less than 31.5 ℃, the operating power of the heating plate 5 is 30% for heating; (3) and when the detected temperature value of the air outlet is monitored to be larger than 31.5 ℃, the operation power of the heating plate 5 is reduced by 15% for heating, and a temperature maintaining effect is achieved.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. A humidification amount control system of a respiratory support device is characterized by comprising a controller, a turbine, an air outlet temperature sensor, a heating plate, a humidification water box, a heating driver and a power supply; the turbine has a turbine outlet; the humidifying water box is provided with a humidifying air inlet and a humidifying air outlet; the turbine air outlet is connected with the humidification air inlet through a pipeline; the heating plate is arranged at the bottom of the humidifying water box; the air outlet temperature sensor is arranged at the humidifying air outlet; the heating plate temperature sensor is arranged on the heating plate; the controller is respectively connected with the turbine, the heating driver, the air outlet temperature sensor and the heating plate temperature sensor; the heating plate is connected with the heating driver; the power supply is used for supplying power to the controller, the turbine and the heating driver.
2. The respiratory support apparatus humidification amount control system of claim 1, further comprising a setting unit coupled to the controller for setting an outlet temperature setting of the humidified water box and a flow setting of the turbine output gas.
3. The respiratory support apparatus humidification amount control system of claim 1, wherein the heating driver is a PWM driver for controlling the heating power of the heating plate according to instructions of the controller.
4. A method of controlling humidification of a respiratory support device using the control system of any of claims 1 to 3, comprising the steps of:
s1, the heating driver operates the heating plate at the initial power and preheats for a first preset time;
s2, detecting a gas outlet detection temperature value of the humidification gas outlet by a gas outlet temperature sensor, detecting a heating plate detection temperature value of a heating plate by a heating plate temperature sensor, and respectively transmitting the gas outlet detection temperature value and the heating plate detection temperature value to a controller;
s3, the controller judges whether the air outlet detection temperature value is smaller than a first air outlet temperature threshold value, if so, the step S4 is executed; if not, go to step S5;
s4, the controller judges whether the detected temperature of the heating plate is smaller than the temperature threshold of the heating plate, if so, the controller controls the heating plate to operate at a first power, and the step S2 is executed; if not, the controller controls the heating plate to operate at the second power, and step S2 is executed;
s5, the controller judges whether the air outlet detection temperature value is smaller than a second air outlet temperature threshold value, if so, the step S6 is executed; if not, the controller controls the heating plate to operate at a fifth power, and step S2 is executed;
s6, the controller judges whether the detected temperature of the heating plate is smaller than the temperature threshold of the heating plate, if so, the heating plate is controlled to operate at a third power, and the step S2 is executed; if not, the heating plate is controlled to operate at the fourth power, and step S2 is executed.
5. The respiratory support apparatus humidification amount control method of claim 4, further comprising, before the step S1:
s0, setting a temperature set value of an air outlet of the humidifying water box and a flow set value of turbine output gas; the controller matches a heating plate temperature threshold value in a heating plate temperature control meter according to the temperature setting and the flow setting value; the controller drives the turbine to output a gas flow at the flow set point.
6. The method of claim 5, wherein the first outlet temperature threshold is the outlet temperature setpoint minus a predetermined temperature value;
and the second air outlet temperature threshold value is obtained by adding a preset temperature value to the set air outlet temperature value.
7. The method of claim 6, wherein the predetermined value is 0.3-0.8 ℃.
8. The respiratory support apparatus humidification control method of claim 5, wherein the heating plate temperature threshold is obtained by:
s01, the controller judges whether the set value of the air outlet temperature is larger than a set temperature threshold value, if so, the step S02 is executed; if not, the heating plate temperature threshold value is a primary fixed value in the heating plate temperature control table;
s02, the heating plate temperature threshold is obtained through the following formula:
TJY＝TCG+a(TCSD-TSY)；
wherein, TJYIs the heater plate temperature threshold; t isCGIs the primary fixed value; t isCSDIs the set value of the air outlet temperature; t isSYIs the set temperature threshold; a is a set constant.
9. The method of claim 5, wherein the outlet temperature set point is set to a range of 31-37 ℃; the range of the flow set value is 10-60L/Min.
10. A breathing support apparatus, characterised in that a control system according to any of claims 1-3 is used.
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| CN112169128A (en) * | 2020-09-27 | 2021-01-05 | 湖南明康中锦医疗科技发展有限公司 | Humidification function self-checking method, fault automatic diagnosis method and respiratory support equipment |
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