CN105126212A - Adjustable atomization circuit and control method - Google Patents

Abstract

The invention discloses an adjustable atomization circuit and a control method, the circuit includes a microcontroller unit, an adjustable boost unit and an ultrasonic atomization unit, and the microcontroller unit is connected to the adjustable boost unit and the ultrasonic atomization unit respectively. An ultrasonic atomization unit, the adjustable boost unit is connected with the ultrasonic atomization unit. The micro-control unit controls the working state of the adjustable booster unit and the ultrasonic atomization unit, and adjusts the frequency and amplitude of ultrasonic vibration, thereby realizing the adjustment of the atomization rate. The present invention can adjust the optimal atomization rate according to different drug properties, making the droplets finer and more uniform, which is more conducive to the absorption of the human lungs, and can also adjust the appropriate atomization rate according to the patient's age and physical condition to improve the atomization treatment. of comfort. This solution is suitable for the field of medicine atomization treatment.

Description

An adjustable atomization circuit and its control method

technical field

The invention relates to the field of medical equipment, in particular to an adjustable atomization circuit and a control method.

Background technique

Aerosol inhalation therapy can make the drug directly act on the lesion. Compared with the oral method, it has the advantages of small dosage, quick effect, less side effects, convenient use, and significant curative effect; and the local drug concentration in the respiratory tract is high, which can avoid or reduce systemic use. hormone. Therefore, aerosol inhalation therapy is an ideal route of administration for the treatment of respiratory diseases, and has been widely used at present.

Of course, aerosol inhalation treatment also needs to pay attention to control some details, if used improperly, it can also lead to adverse consequences. One of them is that the amount of atomization should be controlled correctly.

However, the current medical nebulizers in the market do not have the function of adjusting the nebulization rate. Therefore, for patients who need to control the nebulization volume, manual control by medical staff is required, which is very inconvenient and risky to operate.

The State Intellectual Property Office of the People's Republic of China published a patent document titled "Drug Atomization Device for Medical Hyperbaric Oxygen Chamber" on August 10, 2005 (publication number: CN2715776), which includes drug atomization tanks, drug atomization The tank is set inside the medical hyperbaric oxygen chamber, and the lower part of the drug atomization tank contains the liquid medicine. The oxygen supply tube that provides atomization power oxygen is inserted into the medicine liquid in the medicine atomization tank, and the medicine liquid is connected to the medicine atomizer through the straw. The atomizing nozzle in the upper chamber of the tank, the upper chamber is connected with the medicine pipeline, and the medicine pipeline and the oxygen inhalation pipeline are connected in parallel and then connected to the oxygen inhalation mask. This solution also does not disclose a related solution capable of adjusting the atomization rate.

Contents of the invention

The present invention mainly solves the technical problems of non-adjustable atomization rate, inconvenient operation and high risk in the prior art, and provides an adjustable atomization circuit and control method that can adjust the atomization rate and is convenient for medical staff to control. .

The present invention mainly solves the above-mentioned technical problems through the following technical solutions: an adjustable atomization circuit, including a micro-controller unit, an adjustable boost unit and an ultrasonic atomization unit, and the micro-controller unit is respectively It is connected to an adjustable boost unit and an ultrasonic atomization unit, and the adjustable boost unit is connected to the ultrasonic atomization unit.

The micro-control unit controls the working state of the adjustable booster unit and the ultrasonic atomization unit, and adjusts the frequency and amplitude of ultrasonic vibration, thereby realizing the adjustment of the atomization rate.

Preferably, the ultrasonic atomization unit includes an ultrasonic signal source generating circuit and an atomized wafer, the ultrasonic signal source generating circuit includes a resistor R7, a resistor R8, a capacitor C2, a capacitor C4, an inductor L2 and a MOS transistor Q1, and the inductor The first end of L2 is connected to the power supply +VP, the second end is connected to the drain of MOS transistor Q1, the source of MOS transistor Q1 is grounded through resistor R8, the gate of MOS transistor Q1 is connected to the microcontroller unit through resistor R7, capacitor C2 and The capacitor C4 is connected in parallel with both ends of the inductor L2 after being connected in series, and the atomized chip is connected in parallel with the inductor L2.

The ultrasonic atomization unit converts the electrical energy of the ultrasonic signal source into the mechanical resonance of the atomized chip, and makes the liquid pass through the microporous mesh screen on the atomized chip to form spray droplets.

Preferably, the adjustable boost unit includes a boost converter U1, a capacitor C1, a capacitor C3, an inductor L1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a diode D1, and a MOS transistor Q2 and MOS tube Q3; pin 4 and pin 5 of the boost converter U1 are connected to the input power +VIN, pin 2 is grounded, the first end of capacitor C3 is connected to pin 5 of the boost converter U1, and the other end is grounded; diode D1 The anode of the resistor R1 is connected to pin 1 of the boost converter U1, and the cathode is grounded through the capacitor C1; the first end of the resistor R1 is connected to the cathode of the diode D1, and the second end is connected to the pin 3 of the boost converter U1; the first end of the resistor R2 is connected to Pin 3 of the boost converter U1, the second end is grounded; the first end of the resistor R3 is connected to pin 3 of the boost converter U1, and the second end is connected to the drain of the MOS transistor Q2; the first end of the resistor R4 is connected to the boost Pin 3 of the converter U1, the second end is connected to the drain of the MOS transistor Q3; the gate of the MOS transistor Q2 is connected to the microcontroller unit through the resistor R5, and the source is grounded; the gate of the MOS transistor Q3 is connected to the microcontroller through the resistor R6 unit, the source is grounded; the inductor L1 is connected between pin 1 and pin 5 of the boost converter U1; the cathode of the diode D1 is the power supply +VP terminal; the diode D1 is a Schottky diode.

U1 is a fixed-frequency boost converter. It adjusts the output voltage by comparing the feedback pin 3 with the internal reference voltage. When the output feedback voltage is greater than the internal reference voltage, it reduces the switching modulation pulse duty cycle to make the output voltage smaller. When When the feedback voltage is lower than the internal reference voltage, the duty cycle of the switch modulation pulse is increased to increase the output voltage and finally stabilize the output voltage. When the ports connected to the microcontroller unit and the resistors R5 and R6 both output low levels, the N-channel MOS transistors Q2 and Q3 are not turned on. Since the feedback pin 3 of U1 is the input pin of the error amplifier, there is a very high The input impedance and input current can be ignored, so the current I flowing through R1 and R2 is equal, and I is equal to the internal reference voltage VREF of U1 divided by R1, then the output voltage +VP=I×(R1+R2) can be calculated, and I can be calculated by VREF/ Substituting R2 into the simplification can get: +VP=VREF×(1+R1/R2), when the port connected to the micro-control unit and resistor R5 outputs a high level, the N-channel MOS transistor Q2 is turned on, and R2 becomes the same as R3 is connected in parallel, and the resistance becomes smaller. From the calculation formula, it can be deduced that +VP becomes larger. Similarly, when the port connected to the micro-control unit and resistor R6 also outputs a high level, R2 becomes parallel with R3 and R4, and the resistance further becomes smaller. As a result, +VP is further increased, and the output voltage of +VP can be adjusted to low, medium and high levels through the control of the ports connected to the micro-control unit and resistors R5 and R6. When the port connected to the micro-control unit and the resistor R7 outputs a high level, the N-channel MOS transistor Q1 is turned on, and the current of +VP flowing through the inductor L2 gradually rises, and the inductor stores energy. When the port connected to the micro-control unit and the resistor R7 outputs When the level is low, the N-channel MOS transistor Q1 is turned off, the inductor L2 continues to flow through the atomizer, the voltage is applied to both ends of the atomizer, and the atomizer is driven to vibrate, and the energy of L2 is released through the atomizer to control the micro control unit and the resistor The PWM frequency output from the port connected to R7 can adjust the driving signal frequency of the atomizing sheet. When the driving signal frequency is consistent with the characteristic frequency of the atomizing sheet, the current is the largest and the amount of atomization is also the largest. At the same time, the +VP output voltage can be adjusted by controlling the ports connected to the micro-control unit and resistors R5 and R6, which can adjust the peak voltage applied to both ends of the atomizer, so that the peak current flowing through the atomizer can be changed, thereby adjusting the vibration of the atomizer Amplitude, changes the atomization rate.

An adjustable atomization circuit control method, based on the aforementioned adjustable atomization circuit, includes the following steps:

A. Enter the age of the patient;

B. Enter the patient's disease;

C. The micro-control unit selects the appropriate atomization amount and atomization method according to the patient's age and symptoms.

Different situations require different atomization volumes and atomization methods. For example, if the throat tissue of young children is not fully developed, and the buffering effect of the throat cavity and nose hair is small, a large amount of nebulized inhalation may easily lead to hypoxia. In addition, for patients with chronic obstructive emphysema, the inhalation method of gradually adjusting the amount of nebulization should be adopted during nebulization, that is, start with a small amount of nebulization and a low concentration, and then gradually increase the amount of nebulization after the airway adapts, and Each inhalation time should not exceed 10 minutes; because most of these patients are elderly people with poor respiratory adaptability, pulmonary ventilation and ventilation dysfunction, if the amount of atomization is large at the beginning, a large amount of cold air enters the airway, which may cause Bronchospasm, causing breathlessness and difficulty breathing. In addition, different drugs have different requirements on the amount of atomization due to their different characteristics.

The substantive effect brought by the invention is that the atomization rate can be precisely adjusted in stages, thereby realizing the precise adjustment of the atomization amount; in addition, the circuit can also cooperate with the software system to program and control the atomization rate to realize automatic adjust. According to the actual requirements of patients and drugs, medical staff can choose the appropriate atomization rate for nebulization data. On the one hand, it can enable patients to receive more suitable and precise treatment and reduce risks; on the other hand, it can greatly reduce the complexity of medical staff's operation. , reduce manual risks, improve efficiency and quality of medical care.

Description of drawings

Fig. 1 is a kind of system block diagram of the present invention;

Fig. 2 is a kind of circuit diagram of the present invention;

In the figure: 1. Micro control unit, 2. Adjustable boost unit, 3. Ultrasonic atomization unit.

detailed description

The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Embodiment: An adjustable atomization circuit of this embodiment, as shown in Figure 1, includes a microcontroller unit 1, an adjustable boost unit 2 and an ultrasonic atomization unit 3, and the microcontroller unit is connected to Adjust the boost unit and the ultrasonic atomization unit, the adjustable boost unit is connected with the ultrasonic atomization unit.

As shown in Figure 2, the ultrasonic atomization unit includes an ultrasonic signal source generating circuit and an atomized chip, and the ultrasonic signal source generating circuit includes a resistor R7, a resistor R8, a capacitor C2, a capacitor C4, an inductor L2 and a MOS transistor Q1. The first end of the inductor L2 is connected to the power supply +VP, the second end is connected to the drain of the MOS transistor Q1, the source of the MOS transistor Q1 is grounded through the resistor R8, the gate of the MOS transistor Q1 is connected to the microcontroller unit through the resistor R7, and the capacitor C2 After being connected in series with the capacitor C4, it is connected in parallel at both ends of the inductance L2, and the atomized chip is connected in parallel with the inductance L2. The adjustable boost unit includes a boost converter U1, capacitor C1, capacitor C3, inductor L1, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, diode D1, MOS transistor Q2 and MOS transistor Q3; Pin 4 and pin 5 of the boost converter U1 are connected to the input power supply +VIN, pin 2 is grounded, the first end of the capacitor C3 is connected to pin 5 of the boost converter U1, and the other end is grounded; the anode of the diode D1 is connected to the boost Pin 1 of converter U1, the negative pole is grounded through capacitor C1; the first end of resistor R1 is connected to the negative pole of diode D1, and the second end is connected to pin 3 of boost converter U1; the first end of resistor R2 is connected to boost converter U1 The first end of the resistor R3 is connected to the 3rd pin of the boost converter U1, and the second end is connected to the drain of the MOS transistor Q2; the first end of the resistor R4 is connected to the 3rd pin of the boost converter U1. pin, the second end is connected to the drain of MOS transistor Q3; the gate of MOS transistor Q2 is connected to the microcontroller unit through resistor R5, and the source is grounded; the gate of MOS transistor Q3 is connected to the microcontroller unit through resistor R6, and the source is grounded ; The inductance L1 is connected between pin 1 and pin 5 of the boost converter U1; the cathode of the diode D1 is the power supply +VP terminal; the diode D1 is a Schottky diode.

U1 is a fixed-frequency boost converter. It adjusts the output voltage by comparing the feedback pin 3 with the internal reference voltage. When the output feedback voltage is greater than the internal reference voltage, it reduces the switching modulation pulse duty cycle to make the output voltage smaller. When When the feedback voltage is lower than the internal reference voltage, the duty cycle of the switch modulation pulse is increased to increase the output voltage and finally stabilize the output voltage. When both GPIO0 and GPIO1 output low level, the N-channel MOS transistors Q2 and Q3 are not turned on. Since the feedback pin 3 of U1 is the input pin of the error amplifier, it has a very high input impedance, and the input current can be ignored, so The current I flowing through R1 and R2 is equal, and I is equal to the internal reference voltage VREF of U1 divided by R1, then the output voltage +VP=I×(R1+R2) can be calculated, and I can be simplified by using VREF/R2 to get: +VP =VREF×(1+R1/R2), when GPIO0 outputs a high level, the N-channel MOS transistor Q2 is turned on, at this time R2 becomes parallel with R3, and the resistance becomes smaller. From the calculation formula, it can be deduced that +VP becomes larger Similarly, when GPIO1 also outputs a high level, R2 becomes parallel with R3 and R4, and the resistance value further decreases, so that +VP further increases. Through the control of GPIO0 and GPIO1, the +VP output voltage can be adjusted to low, medium and high. files. When GPIO2 outputs a high level, the N-channel MOS transistor Q1 is turned on, and the current of +VP flowing through the inductor L2 gradually rises, and the inductor stores energy. When the GPIO2 outputs a low level, the N-channel MOS transistor Q1 is turned off, and the inductor L2 passes through the fog Continuous flow of the atomizer, the voltage is applied to both ends of the atomizer to drive the atomizer to vibrate, and the L2 energy is released through the atomizer. Controlling the PWM frequency output by GPIO2 can adjust the drive signal frequency of the atomizer. When the drive signal frequency is consistent with the atomizer When the characteristic frequency of the sheet is consistent, the current is the largest and the amount of atomization is also the largest. At the same time, by controlling GPIO0 and GPIO1 to adjust the +VP output voltage, the peak voltage applied to both ends of the atomizer can be adjusted to change the peak current flowing through the atomizer, thereby adjusting the vibration amplitude of the atomizer and changing the atomization rate.

An adjustable atomization circuit control method in this embodiment includes the following steps:

A. Enter the age of the patient;

B. Enter the patient's disease;

C. The micro-control unit selects the appropriate atomization amount and atomization method according to the patient's age and symptoms.

Step C is specifically:

C1. Determine whether the patient's age Y is less than 7 years old, if yes, go to step C2, otherwise go to step C3;

C2. The base atomization amount is set to Y×10%+30%, and enter step C4;

C3. Set the base atomization amount to 100%, and proceed to step C4;

C4. Determine whether the patient's condition is chronic obstructive emphysema, if yes, then enter step C5; otherwise, enter step C7;

C5. Adopt the progressive atomization method, specifically: the initial atomization amount is 10%, and the atomization amount increases by 10% every 20 seconds until the atomization amount reaches the baseline atomization amount, and the baseline atomization amount is maintained for 7 minutes, then stop Atomization;

C6. Repeat step C5 after an interval of 5-10 minutes until the drug is atomized;

C7. Adopt the conventional atomization method, specifically: directly adjust the atomization amount to the reference atomization amount until the drug atomization is completed.

In this solution, the atomization amount is the atomization rate, that is, the ratio of the maximum atomization rate of the nebulizer. For example, the current atomization amount is 50%, that is, the current atomization rate is 50% of the maximum atomization rate .

The atomization amount and atomization method can also consider the characteristics of the drug. For some drugs, the control method also needs to include the following steps in step C5: input the type of drug, and the micro-control unit selects the matching atomization amount and atomization method from the database. and correction amount, if the atomization amount and atomization method are not empty, the drug will be atomized according to the matched atomization amount and atomization method, and the atomization amount and atomization method obtained according to age and disease will be discarded; if If the atomization amount and atomization method are empty, the parameters such as the reference atomization amount, initial atomization amount, single atomization time, atomization interval, and atomization amount growth rate are corrected according to the correction amount;

Step C6 also needs to include the following steps: input the type of medicine, the micro-control unit selects the matching atomization amount, atomization method and correction amount from the database, if the atomization amount and atomization method are not empty, then follow the matched The atomization amount and atomization method are used to atomize the medicine, and the atomization amount and atomization method obtained according to age and disease are discarded; if the atomization amount and atomization method are empty, the base atomization amount is corrected according to the correction amount.

The atomization rate adjustable circuit of this program enables the nebulizer to adjust the optimal atomization rate according to the characteristics of different drugs, making the droplets smaller and more uniform, which is more conducive to the absorption of the human lungs. It can also be adjusted according to the age and physical condition of the patient. Adjust the appropriate atomization rate to improve the comfort of atomization therapy.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Although terms such as microcontroller unit, ultrasonic atomization unit, and atomization volume are frequently used in this paper, the possibility of using other terms is not excluded. These terms are used only for the purpose of describing and explaining the essence of the present invention more conveniently; interpreting them as any kind of additional limitation is against the spirit of the present invention.

Claims (4)

1. An adjustable atomization circuit, characterized in that it comprises a microcontroller unit, an adjustable boost unit and an ultrasonic atomization unit, and the microcontroller unit is connected to the adjustable boost unit and the ultrasonic atomization unit respectively unit, and the adjustable boost unit is connected to the ultrasonic atomization unit. 2. An adjustable atomization circuit according to claim 1, wherein the ultrasonic atomization unit includes an ultrasonic signal source generating circuit and an atomized chip, and the ultrasonic signal source generating circuit includes a resistor R7, Resistor R8, capacitor C2, capacitor C4, inductor L2 and MOS transistor Q1, the first end of the inductor L2 is connected to the power supply +VP, the second end is connected to the drain of the MOS transistor Q1, and the source of the MOS transistor Q1 is grounded through the resistor R8 , the gate of the MOS transistor Q1 is connected to the microcontroller unit through the resistor R7, the capacitor C2 and the capacitor C4 are connected in parallel to both ends of the inductor L2 after being connected in series, and the atomized chip is connected in parallel to the inductor L2. 3. An adjustable atomization circuit according to claim 1 or 2, characterized in that the adjustable boost unit includes a boost converter U1, a capacitor C1, a capacitor C3, an inductor L1, a resistor R1, Resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, diode D1, MOS transistor Q2 and MOS transistor Q3; pin 4 and pin 5 of the boost converter U1 are connected to the input power supply +VIN, pin 2 is grounded, and the capacitor One end of C3 is connected to pin 5 of the boost converter U1, and the other end is grounded; the anode of the diode D1 is connected to pin 1 of the boost converter U1, and the negative pole is grounded through the capacitor C1; the first end of the resistor R1 is connected to the negative pole of the diode D1. The two ends are connected to pin 3 of boost converter U1; the first end of resistor R2 is connected to pin 3 of boost converter U1, and the second end is grounded; the first end of resistor R3 is connected to pin 3 of boost converter U1, and the first end of resistor R3 is connected to pin 3 of boost converter U1. The two ends are connected to the drain of the MOS transistor Q2; the first end of the resistor R4 is connected to the pin 3 of the boost converter U1, and the second end is connected to the drain of the MOS transistor Q3; the gate of the MOS transistor Q2 is connected to the microcontroller through the resistor R5 Unit, the source is grounded; the gate of the MOS transistor Q3 is connected to the microcontroller unit through the resistor R6, and the source is grounded; the inductor L1 is connected between pin 1 and pin 5 of the boost converter U1; the cathode of the diode D1 is the power supply +VP terminal; diode D1 is a Schottky diode. 4. An adjustable atomization circuit control method, based on the adjustable atomization circuit according to claim 1, 2 or 3, characterized in that it comprises the following steps: A. Enter the age of the patient; B. Enter the patient's disease; C. The micro-control unit selects the appropriate atomization amount and atomization method according to the patient's age and symptoms.