CN114028657A - Infusion heating control technology - Google Patents
Infusion heating control technology Download PDFInfo
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- CN114028657A CN114028657A CN202111352501.2A CN202111352501A CN114028657A CN 114028657 A CN114028657 A CN 114028657A CN 202111352501 A CN202111352501 A CN 202111352501A CN 114028657 A CN114028657 A CN 114028657A
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- temperature
- circuit
- chip microcomputer
- single chip
- infusion
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/44—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for cooling or heating the devices or media
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3368—Temperature
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/36—General characteristics of the apparatus related to heating or cooling
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/50—General characteristics of the apparatus with microprocessors or computers
- A61M2205/502—User interfaces, e.g. screens or keyboards
- A61M2205/505—Touch-screens; Virtual keyboard or keypads; Virtual buttons; Soft keys; Mouse touches
Abstract
The invention discloses a transfusion heating control technology, belonging to the technical field of medical appliances, comprising a main control chip, a temperature control circuit and a temperature control circuit, wherein the main control chip is used for controlling a circuit and adopts a closed-loop control algorithm to control the temperature; the temperature measuring circuit is used for collecting the ambient temperature, the main control chip reversely deduces the current ambient temperature value by collecting the voltage at two ends of the temperature measuring circuit, and a preset target temperature needs to be input into the main control chip when the temperature measuring circuit is used; the load driving circuit is used for driving a load to heat the infusion pipeline, the main control chip adopts a single chip microcomputer to drive and control the whole circuit, and the single chip microcomputer and a circuit connected with the single chip microcomputer. The invention is mainly applied to the medical aspect and used for heating and controlling the temperature when a patient is transfused, so that the transfusion is more comfortable, the closed-loop control algorithm is used for controlling the temperature of the transfusion pipeline, the discomfort of the patient caused by overhigh temperature is avoided, and the algorithm is used for controlling the temperature, so that the component cost is reduced.
Description
Technical Field
The invention belongs to the technical field of medical instruments, and particularly relates to an infusion heating control technology.
Background
Infusion is also called as infusion or hanging water. Is a large dose (more than 100ml per administration) of injection which is infused into the body by intravenous drip. Are usually packaged in glass or plastic infusion bottles or bags and contain no preservatives or bacteriostatic agents. When in use, the dropping speed is adjusted by the infusion apparatus, and the infusion apparatus continuously and stably enters the vein to supplement body fluid and electrolyte or provide nutrient substances.
For example, CN111596700A discloses a safety control method and circuit for an infusion heater, and an infusion heater, wherein the safety control method for infusion heating includes a temperature monitoring process, a heating current monitoring process, and a heating control PWM signal monitoring process, and the heating current monitoring process and the temperature monitoring process are sequentially and cyclically executed in the heating process. The safety of infusion heating is guaranteed by monitoring the temperature, the current of the heating device and a heating control PWM signal which is sent by the heating controller and used for controlling heating, the situations that the heating device fails or a temperature sensor fails and the heating controller is halted can be effectively prevented, and medical accidents caused by abnormal heating due to the situations are avoided. Therefore, we propose an infusion warming control technology to solve the above problems.
Disclosure of Invention
The invention aims to provide an infusion heating control technology to solve the problem that the existing infusion process in the background technology generally causes discomfort to a patient due to direct infusion.
In order to achieve the purpose, the invention provides the following technical scheme: the infusion warming control technology comprises:
the main control chip is used for controlling the circuit and performing temperature control by adopting a closed-loop control algorithm;
the temperature measuring circuit is used for collecting the ambient temperature, the main control chip reversely deduces the current ambient temperature value by collecting the voltage at two ends of the temperature measuring circuit, and a preset target temperature needs to be input into the main control chip when the temperature measuring circuit is used;
and the load driving circuit is used for driving the load to heat the infusion pipeline.
Preferably, the main control chip adopts a single chip microcomputer to drive and control the whole circuit, and the single chip microcomputer and the circuit connected with the single chip microcomputer perform system initialization when receiving signals to start.
Preferably, the temperature measuring circuit is an NTC temperature measuring circuit, wherein the NTC is a thermistor, the NTC temperature measuring circuit is used for detecting the loop temperature, and the NTC temperature measuring circuit and the load driving circuit are correspondingly arranged on the infusion tube before the target temperature is preset.
Preferably, the single chip microcomputer is further connected with an LCD display circuit, the LCD display circuit comprises an LCD liquid crystal display screen for displaying the current ambient temperature, and the single chip microcomputer is further used for timing when the load driving circuit is heated through a built-in clock and displaying the timing on the LCD liquid crystal display screen.
Preferably, the closed-loop control algorithm uses a PID algorithm, that is, the temperature is controlled according to the proportion, the integral and the differential of the deviation.
Preferably, the single chip microcomputer outputs a PWM signal to control the load driving circuit, wherein the PWM signal is a pulse width modulation signal.
Preferably, the single chip microcomputer obtains the value of the ambient temperature through the NTC temperature measuring circuit, compares the target temperature with the ambient temperature, and further keeps constant through the PWM signal if the target temperature is reached.
Preferably, if the ambient temperature is lower than the target temperature, the single chip outputs a corresponding PWM signal to continuously operate the load driving circuit, so that the load is heated, and then the ambient temperature is obtained for comparison.
Preferably, the single chip microcomputer is further connected with a direct current detection circuit for detecting direct current input current and preventing circuit elements from being damaged due to overlarge current.
Preferably, when the ambient temperature reaches the target temperature, the single chip microcomputer outputs a corresponding PWM signal to stop heating the load in the load driving circuit, and when the ambient temperature is lower than a preset threshold, the single chip microcomputer controls the heating.
Compared with the prior art, the invention has the beneficial effects that:
the invention is mainly applied to the medical aspect, and is used for heating and controlling the temperature when the infusion is carried out on a patient, so that the infusion is more comfortable.
The temperature of the infusion pipeline is controlled through a closed-loop control algorithm, discomfort of a patient caused by overhigh temperature is avoided, the temperature is controlled through the algorithm, only one NTC temperature measuring circuit needs to be added, only one temperature sensor can be added, and the component cost is reduced.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a temperature control flow chart of the PID algorithm of the invention;
FIG. 3 is a schematic circuit diagram of a main control chip according to the present invention;
FIG. 4 is a schematic diagram of a load driving circuit of the present invention;
FIG. 5 is a schematic diagram of an NTC temperature measurement circuit of the present invention;
FIG. 6 is a schematic diagram of a buzzer driving circuit of the present invention;
FIG. 7 is a schematic diagram of an LCD display circuit according to the present invention;
FIG. 8 is a schematic diagram of the boost circuit of the present invention;
FIG. 9 is a schematic diagram of a BAT charging circuit according to the present invention;
FIG. 10 is a schematic diagram of the DC detection circuit of the present invention;
FIG. 11 is a schematic diagram of a recording interface circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-11, the present invention provides a technical solution: the infusion warming control technology comprises:
the main control chip is used for controlling the circuit and performing temperature control by adopting a closed-loop control algorithm;
the temperature measuring circuit is used for collecting the ambient temperature, the main control chip reversely deduces the current ambient temperature value by collecting the voltage at two ends of the temperature measuring circuit, and a preset target temperature needs to be input into the main control chip when the temperature measuring circuit is used;
and the load driving circuit is used for driving the load to heat the infusion pipeline.
In this embodiment, referring to fig. 1-2, the temperature is controlled, before use, the load driving circuit and the corresponding load heating part are disposed on the infusion tube, and when the circuit is started, the main control chip and its peripheral circuits are started for initialization; measuring an environment temperature value through an NTC temperature measuring circuit, wherein the environment temperature is represented as the peripheral temperature of the infusion pipeline; a user sets a target temperature on the infusion pipeline; after the setting is finished, the single chip microcomputer controls an output signal to enable the load driving circuit to drive the load to heat the infusion pipeline, and the single chip microcomputer synchronously times; and controlling the ambient temperature by adopting a closed-loop control algorithm so as to keep the ambient temperature at the target temperature all the time.
The closed-loop control is a control method of performing correction based on output feedback of a control target, and performs correction by a rate or a standard when a deviation between an actual value and a planned value is measured.
The temperature of the infusion pipeline is controlled through a closed-loop control algorithm, discomfort of a patient caused by overhigh temperature is avoided, the temperature is controlled through the algorithm, only one NTC temperature measuring circuit needs to be added, only one temperature sensor can be added, and the component cost is reduced.
Specifically, the main control chip adopts a single chip microcomputer to drive and control the whole circuit, the single chip microcomputer and a circuit connected with the single chip microcomputer, and when the main control chip receives a signal to start, system initialization is carried out.
In this embodiment, a single chip microcomputer is used as a data control processing center of the whole circuit, and the model is BS67F 350C.
Specifically, the temperature measuring circuit selects an NTC temperature measuring circuit, wherein the NTC is a thermistor, the NTC temperature measuring circuit is used for detecting the loop temperature, and before the preset target temperature, the NTC temperature measuring circuit and the load driving circuit are correspondingly arranged on the infusion pipeline.
In this embodiment, R9 in fig. 5 is an NTC thermistor, the NTC and a fixed value resistor R10 are connected in series, when the ambient temperature changes, the resistance value of the NTC changes, which results in a change in the voltage at the two ends of the NTC, and the single chip microcomputer can reversely derive the current temperature value by collecting the voltage at the two ends of the NTC, which is low in cost.
The target temperature can be set by referring to the body temperature and can be between 36 and 37 ℃.
Specifically, the singlechip is also connected with an LCD display circuit, the LCD display circuit comprises an LCD liquid crystal display screen and is used for displaying the current ambient temperature, and the singlechip is also used for timing when the load driving circuit heats and displaying on the LCD liquid crystal display screen through a built-in clock.
In this embodiment, LCD liquid crystal display comes to ambient temperature, and the temperature is looked over to the user's perception of being convenient for, adjusts target temperature, in addition, still shows operating duration through LCD liquid crystal display, and the clock through the singlechip is built-in comes the timing, measures the operating time of this circuit heating to make the user accurate to the accuse infusion duration.
The liquid crystal screen can also adopt a TFT touch liquid crystal screen for controlling by touching the screen.
Specifically, the closed-loop control algorithm uses a PID algorithm, i.e., controls the temperature according to the proportion, the integral and the differential of the deviation.
In this embodiment, PID, which is the simplest one of the closed loop control algorithms. PID is an abbreviation for proportional (contribution) Integral, (Integral) Differential, (Differential coefficient) representing three control algorithms, respectively.
The combination of the three algorithms can effectively correct the deviation of the controlled object, namely the temperature, so that the ambient temperature reaches a stable state.
Specifically, the single chip microcomputer outputs a PWM signal to control the load driving circuit, wherein the PWM signal is a pulse width modulation signal.
In this embodiment, PWM is a method of digitally encoding the level of an analog signal. Through the use of a high resolution counter, by adjusting the duty cycle of the square wave.
Specifically, the single chip microcomputer obtains the value of the ambient temperature through the temperature measuring circuit, compares the target temperature with the ambient temperature, and further keeps constant through the PWM signal if the target temperature is reached.
In this embodiment, if the target temperature is reached, the duty ratio of the PWM signal may be adjusted, for example, the duty ratio is reduced, so as to stop heating the load in the load driving circuit, where the load may be an electric heating wire.
Specifically, if the ambient temperature is lower than the target temperature, the single chip outputs a corresponding PWM signal to continuously operate the load driving circuit, heat the load, and then obtain the ambient temperature for comparison.
In this embodiment, the duty ratio of the PWM signal may be adjusted, for example, increased, so that the load in the load driving circuit is continuously heated and the ambient temperature reaches the target temperature.
Specifically, the single chip microcomputer is further connected with a direct current detection circuit for detecting direct current input current and preventing circuit elements from being damaged due to overlarge current.
In this embodiment, the dc detection circuit is further connected to detect the current for performing closed-loop control.
Specifically, when the ambient temperature reaches the target temperature, the single chip microcomputer outputs a corresponding PWM signal to stop heating the load in the load driving circuit, and when the ambient temperature is lower than a preset threshold value, the single chip microcomputer controls the heating.
In this embodiment, when the predetermined temperature is reached, the temperature is controlled by the PID algorithm, wherein if the ring temperature is greater than another preset threshold, the temperature is still controlled by the PID algorithm.
The singlechip is also connected with a buzzer circuit, and when the circuit runs abnormally, if the element is burnt due to overlarge current, the buzzer alarms.
The BAT battery charging circuit selects ME4068 as a lithium battery charging management chip, and ME4068 is internally provided with a backflow prevention function, so that the practical application does not need an input end to be connected with a diode to prevent backflow, and the lithium battery can be charged through an input direct current circuit, so that a device corresponding to the circuit can still work under the condition of no external power supply.
The BAT battery charging circuit is also connected with a booster circuit for raising the output voltage of the battery and rectifying the output voltage.
The singlechip is also connected with a burning port, and the burning program is carried out through two corresponding pins of the singlechip.
The working principle and the using process of the invention are as follows: before use, the load driving circuit and the corresponding load heating part are arranged on the infusion pipeline, and when the circuit is started to run, the main control chip and the peripheral circuits thereof are started to carry out initialization; measuring an environment temperature value through an NTC temperature measuring circuit, wherein the environment temperature is represented as the peripheral temperature of the infusion pipeline; a user sets a target temperature on the infusion pipeline; after the setting is finished, the single chip microcomputer controls an output signal to enable the load driving circuit to drive the load to heat the infusion pipeline, and the single chip microcomputer synchronously times; and controlling the ambient temperature by adopting a closed-loop control algorithm so as to keep the ambient temperature at the target temperature all the time.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The infusion heating control technology is characterized in that: the method comprises the following steps:
the main control chip is used for controlling the circuit and performing temperature control by adopting a closed-loop control algorithm;
the temperature measuring circuit is used for collecting the ambient temperature, the main control chip reversely deduces the current ambient temperature value by collecting the voltage at two ends of the temperature measuring circuit, and a preset target temperature needs to be input into the main control chip when the temperature measuring circuit is used;
and the load driving circuit is used for driving the load to heat the infusion pipeline.
2. The infusion heating control technology according to claim 1, characterized in that: the main control chip adopts a single chip microcomputer to drive and control the whole circuit, and the single chip microcomputer and the circuit connected with the single chip microcomputer perform system initialization when receiving signals to start.
3. The infusion heating control technology according to claim 1, characterized in that: the temperature measuring circuit is characterized in that an NTC temperature measuring circuit is selected for use, wherein an NTC is a thermistor, the NTC temperature measuring circuit is used for detecting the loop temperature, and the NTC temperature measuring circuit and the load driving circuit are correspondingly arranged on the infusion tube before the target temperature is preset.
4. The infusion heating control technology according to claim 2, characterized in that: the single chip microcomputer is further connected with an LCD display circuit, the LCD display circuit comprises an LCD liquid crystal display screen and is used for displaying the current environment temperature, and the single chip microcomputer is used for timing when the load driving circuit is heated through a built-in clock and displaying the timing on the LCD liquid crystal display screen.
5. The infusion heating control technology according to claim 1, characterized in that: the closed-loop control algorithm adopts a PID algorithm, namely, the temperature is controlled according to the proportion, the integral and the differential of the deviation.
6. The infusion heating control technology according to claim 1, characterized in that: the single chip microcomputer outputs a PWM signal to control the load driving circuit, wherein the PWM signal refers to a pulse width modulation signal.
7. The infusion heating control technology according to claim 1, characterized in that: the single chip microcomputer obtains the value of the ambient temperature through the NTC temperature measuring circuit, compares the target temperature with the ambient temperature, and further keeps constant through a PWM signal if the target temperature is reached.
8. The infusion heating control technology according to claim 7, characterized in that: and if the ambient temperature is lower than the target temperature, the singlechip outputs a corresponding PWM signal so as to enable the load driving circuit to continuously operate, so that the load is heated, and then the ambient temperature is acquired for comparison.
9. The infusion heating control technology according to claim 7, characterized in that: the single chip microcomputer is also connected with a direct current detection circuit and used for detecting direct current input current and preventing circuit elements from being damaged due to overlarge current.
10. The infusion heating control technology according to claim 7, characterized in that: when the ambient temperature reaches the target temperature, the single chip microcomputer outputs a corresponding PWM signal so as to stop heating the load in the load driving circuit, and when the ambient temperature is lower than a preset threshold value, the single chip microcomputer controls the heating.
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| CN202111352501.2A CN114028657A (en) | 2021-11-16 | 2021-11-16 | Infusion heating control technology |
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| CN202111352501.2A CN114028657A (en) | 2021-11-16 | 2021-11-16 | Infusion heating control technology |
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| CN114028657A true CN114028657A (en) | 2022-02-11 |
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2021
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