CN216798393U

CN216798393U - Refined control system of infusion monitor

Info

Publication number: CN216798393U
Application number: CN202122557285.7U
Authority: CN
Inventors: 陈召辉; 朱杰
Original assignee: Shijiazhuang Bozhen Pharmaceutical Technology Co ltd
Current assignee: Shijiazhuang Bozhen Pharmaceutical Technology Co ltd
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2022-06-24
Anticipated expiration: 2031-10-22

Abstract

The utility model relates to the technical field of medical instruments, and provides a fine control system of an infusion monitor, which comprises a power supply unit, a control unit, a gravity acquisition unit, a communication unit and a capacitance acquisition unit, wherein the gravity acquisition unit, the communication unit and the capacitance acquisition unit are connected with the control unit, the capacitance acquisition unit comprises a capacitance sensing chip U11 and a capacitance sensing strip, a CX pin of the capacitance sensing chip U11 is connected with the capacitance sensing strip after being connected with a resistor RX in series, an OUT pin of the capacitance sensing chip U11 is used as an output end of the capacitance acquisition unit to be connected with the control unit, and the OUT pin of the capacitance sensing chip U11 is also connected with a VCC voltage source through a pull-up resistor RU. The gravity of the infusion bag is detected through the gravity acquisition unit, and the liquid flowing condition in the infusion tube is detected through the capacitance acquisition unit. The control unit carries out operation processing through the two signals, sends the infusion condition of the patient to the nurse station host by means of the communication unit, improves the infusion monitoring precision through dual detection of gravity and liquid flow, and enhances the safety guarantee of the patient during infusion.

Description

Refined control system of infusion monitor

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a fine control system of an infusion monitor.

Background

Infusion is one of the most basic medical methods for treating diseases at present, and hospitals need to select proper intravenous infusion drip speed according to the drugs of infusion and the conditions of patients during the infusion treatment of the patients.

Traditional monitoring of intravenous infusion generally adopts manual mode, and nurse adjusts the speed to the appropriate value according to experience. When the liquid is completely transfused, the treatment of changing the medicine or pulling out the needle is carried out. If no accompanying nursing is available beside the bed or medical staff do not change the medicine or pull out the needle in time, air enters the blood vessel to form air embolism, blood coagulation and needle blockage and the like. The treatment is delayed, so that the pain is caused to the patient, the physical and mental health of the patient is seriously endangered, and the irreparable medical accident is caused.

In order to solve the problem, an infusion monitor appears, most of the existing infusion monitors adopt a gravity sensing mode, whether infusion is finished or not is judged by detecting the weight of a liquid medicine bag, but the measurement precision of the method is not high, the method is easily influenced by water drops and steam in the liquid medicine bag, and the infusion monitoring effect cannot be well realized.

SUMMERY OF THE UTILITY MODEL

The utility model provides a refined control system of an infusion monitor, and solves the problems that in the prior art, the infusion monitor is low in precision measurement precision and is easily influenced by water drops and steam in a medicine bag.

The technical scheme of the utility model is as follows:

infusion monitor control system that becomes more meticulous, including power supply unit, the control unit and the gravity acquisition unit, the communication unit who is connected with the control unit, the power supply unit is used for providing DC power supply, the control unit with the help of communication unit and nurse station host communication, infusion monitor control system that becomes more meticulous still include electric capacity acquisition unit, electric capacity acquisition unit includes electric capacity sensing chip U11 and electric capacity response strip, electric capacity response strip sets up on the transfer line, connect behind electric capacity sensing chip U11's CX pin series resistance RX electric capacity response strip, electric capacity sensing chip U11's OUT pin does electric capacity acquisition unit's output is connected the control unit, electric capacity sensing chip U11's OUT pin still connects the VCC voltage source through pull-up resistance RU.

Further, the gravity acquisition unit comprises multiple paths with the same circuit structure, wherein one path comprises an analog-to-digital conversion chip U3, a first input channel AINP1 and an AINN1 of the analog-to-digital conversion chip U3 are used for being connected with an output end of the first gravity sensor, a clock pin SCLK and a data pin DRDY/DOUT of the analog-to-digital conversion chip U3 are both connected with the control unit, and a REFOUT pin of the analog-to-digital conversion chip U3 is connected with a power supply end of the first gravity sensor.

Further, the communication unit includes an internet of things chip U4, an antenna ANT1, a SIM card socket IC1 and a diode integrated chip IC2, communication pins RXD and TXD of the internet of things chip U4 are both connected to the control unit, an RF _ ANT pin of the internet of things chip U4 is connected to the antenna ANT1, SIM _ DATA, SIM _ RST, SIM _ CLK, and SIM _ VDD pins of the internet of things chip U4 are respectively connected to IO, RST, CLK, and VCC pins of the SIM card socket IC1, an IO pin of the SIM card socket IC1 is further connected to a VCC pin of the SIM card socket IC1, and IO, RST, CLK, and VCC pins of the SIM card socket IC1 are all grounded through the diode integrated chip IC 2.

Further, the power supply unit comprises a main power supply circuit, the main power supply circuit comprises a voltage stabilizing chip U2, an input pin VIN of the voltage stabilizing chip U2 is connected with a voltage source VDD output by a battery BAT, an enable pin EN of the voltage stabilizing chip U2 is connected with the voltage source VDD, the voltage source VDD is grounded through a capacitor C8, an output pin Vout of the voltage stabilizing chip U2 outputs a voltage source MCU _3V3, the voltage source MCU _3V3 is grounded through a capacitor C5, and a capacitor C6 is connected to the capacitor C5 in parallel.

Further, the power supply unit still includes communication power supply circuit, communication power supply circuit includes triode Q6, MOS pipe Q5 and zener diode D3, triode Q6's base is connected the control unit, triode Q6's emitter ground, triode Q6's collecting electrode is connected MOS pipe Q5's grid, MOS pipe Q5 source connection the voltage source VDD, MOS pipe Q5's drain electrode is connected zener diode D3's negative pole, zener diode D3's positive pole ground connection, MOS pipe Q5's drain electrode output voltage source NB _ POW is the communication unit power supply.

Furthermore, the utility model also comprises a charging circuit, the charging circuit comprises a charging chip U6, an input pin VIN of the charging chip U6 is connected with a voltage source VBUS, a BAT pin of the charging chip U6 is connected with a resistor R27 in series and then is used as an output end of the charging circuit to be connected with a positive pole B + of the battery BAT, a SW pin of the charging chip U6 is connected with the positive pole B + of the battery BAT through an inductor L4, a TEST pin of the charging chip U6 is connected with the positive pole B + of the battery BAT through a resistor R25, and an NTC pin of the charging chip U6 is grounded through a resistor R28.

Further, the utility model further comprises a charge protection circuit, wherein the charge protection circuit comprises a MOS transistor Q12, a protection chip U7 and a dual MOS chip U8, a negative electrode B-of the battery BAT is connected with a gate of the MOS transistor Q12, a positive electrode B + of the battery BAT is connected with a drain of the MOS transistor Q12 through a resistor R32, a source of the MOS transistor Q12 is connected with a VDD pin of the protection chip U7, a VSS pin of the protection chip U7 is also connected with a gate of the MOS transistor Q12, a DOUT pin of the protection chip U7 is connected with a G1 pin of the dual MOS chip U8, a COUT pin of the protection chip U7 is connected with a G2 pin of the dual MOS chip U8, a S1 pin of the dual MOS chip U8 is connected with a negative electrode B-of the battery BAT, and two D12 pins of the dual MOS chip U8 are connected.

Furthermore, the utility model also comprises a power on/off control unit, the power on/off control unit comprises a triode Q9, a double diode D5, a MOS tube Q8 and a switch KEY KEY, the base electrode of the triode Q9 is used as the input end of the power on/off control unit and is connected with the control unit, the emitter electrode of the triode Q9 is grounded, the collector electrode of the triode Q9 is connected with the positive electrode B + of the battery BAT through a resistor R30, one end of the switch KEY KEY is grounded, the other end of the switch KEY KEY is connected with the cathode of the double diode D5, the first anode of the double diode D5 is connected with the grid electrode of the MOS tube Q8, the second anode of the double diode D5 is used as the output end of the power on/off control unit and is connected with the control unit, the output end of the power on/off control unit is also connected with a VDD voltage source through a resistor R31, the source electrode of the MOS tube Q8 is connected with the positive electrode B + of the battery BAT, the drain electrode of the MOS tube Q8 is connected with a VDD voltage source.

Further, the power on/off control unit further includes a MOS transistor Q5, a diode D8 and a resistor R14, the MOS transistor Q5 is connected in series between the MOS transistor Q8 and a VDD voltage source, the drain of the MOS transistor Q5 is connected to the drain of the MOS transistor Q8, the source of the MOS transistor Q5 is connected to the VDD voltage source, the gate of the MOS transistor Q5 is connected to the charging interface, the gate of the MOS transistor Q5 is also grounded through the resistor R14, the anode of the diode D8 is connected to the charging interface, and the cathode of the diode D8 is connected to the VDD voltage source.

Furthermore, the utility model also comprises an alarm unit, wherein the alarm unit comprises a triode Q3 and a buzzer BEE1, the base electrode of the triode Q3 is connected with the control unit, the emitting electrode of the triode Q3 is grounded, the collecting electrode of the triode Q3 is connected with the negative electrode of the buzzer BEE1, the positive electrode of the buzzer BEE1 is connected with a 3.3V voltage source, and a capacitor C7 is connected between the positive electrode and the negative electrode of the buzzer BEE1 in parallel.

The working principle and the beneficial effects of the utility model are as follows:

according to the capacitive touch key principle: in the utility model, an induction capacitor is formed between the capacitance induction strip and the ground, the capacitance induction strip is arranged on the infusion tube, and the induction capacitor between the capacitance induction strip and the ground can be changed by the amount of liquid in the infusion tube. The capacitance sensing strip is connected with the capacitance sensing chip U1, and the output level of the capacitance sensing chip U1 changes according to the size of the sensing capacitance on the capacitance sensing strip. When the transfusion is not finished, the capacitance induction bar senses that the liquid exists and outputs low level; when infusion is just finished, the capacitance sensing strip cannot sense liquid, the output pin OUT of the capacitance sensing chip U1 is in a high-resistance state, and under the action of the external pull-up resistor RU, high level is pulled up and output.

According to the utility model, the gravity signal of the infusion bag is converted into the electric signal through the gravity acquisition unit and is sent to the control unit in real time, and the liquid flowing signal in the infusion tube is converted into the electric signal through the capacitance acquisition unit and is sent to the control unit in real time. The control unit judges the infusion condition according to the states of the two signals, judges the end of infusion as long as one signal is effective, and sends the infusion condition to a nurse station host computer patient by means of the communication unit, so that the accuracy of infusion monitoring is improved and the safety guarantee of the patient in infusion is enhanced by dual detection of gravity and liquid flow.

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Drawings

FIG. 1 is a functional block diagram of the present invention;

FIG. 2 is a circuit diagram of a control unit according to the present invention;

FIG. 3 is a circuit diagram of a display unit according to the present invention;

FIG. 4 is a circuit diagram of a capacitance acquisition unit of the present invention;

FIG. 5 is a circuit diagram of a gravity sensing unit according to the present invention;

FIG. 6 is a circuit diagram of a communication unit according to the present invention;

FIG. 7 is a circuit diagram of a power supply unit of the present invention;

FIG. 8 is a circuit diagram of a charging circuit according to the present invention;

FIG. 9 is a circuit diagram of the charge protection circuit of the present invention;

FIG. 10 is a circuit diagram of the power on/off control unit of the present invention;

fig. 11 is a circuit diagram of an alarm unit of 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 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 inventive step, are intended to be within the scope of the present invention.

Example 1

As shown in fig. 1-3, this embodiment provides infusion MONITOR fine control system, including the power supply unit, the control unit and the display element who is connected with the control unit, gravity acquisition unit, the communication unit, the power supply unit is used for providing DC power supply, the control unit communicates with nurse station host computer with the help of the communication unit, the control unit includes that the model is STM32L053R8T 6's singlechip U1, the display element includes that the model is MONITOR _ LCD's display U9, singlechip U1 passes through triode Q1 and triode Q10 control display U9.

In this embodiment, infusion monitor control system that refines still includes electric capacity collection unit, as shown in fig. 4, electric capacity collection unit includes electric capacity sensing chip U11 and electric capacity response strip, connects electric capacity response strip behind electric capacity sensing chip U11's CX pin series resistance RX, and electric capacity sensing chip U11's OUT pin is as electric capacity collection unit's output connection control unit, and electric capacity sensing chip U11's OUT pin still connects the VCC voltage source through pull-up resistance RU.

The capacitance induction strip is arranged on the infusion tube and used for detecting liquid flowing in the infusion tube, sending the detected signals to the capacitance sensing chip U11 for processing and outputting TTL level signals to the control unit. When the transfusion is not finished and the capacitance induction bar senses water, outputting a low level; when the infusion is just finished and the capacitance sensing strip cannot sense water, the output pin OUT of the capacitance sensing chip U11 is in a high-resistance state, and is pulled up to output a high level under the action of the external pull-up resistor RU. Wherein, the pins CR and SEN of the capacitance sensing chip U11 are externally connected with a sensitivity adjusting capacitor, SEN is roughly adjusted, and CR is finely adjusted. VREG is the internal reference source of the chip.

In this embodiment, the power supply unit, the control unit, and the display unit, the gravity collection unit and the communication unit connected to the control unit are packaged as a host, and are arranged at the hanging position of the infusion bag, so that the gravity detection of the infusion bag is facilitated. The capacitance acquisition unit is connected with the host machine through a 3.5mm public-public earphone connecting wire, and a J7 interface in the figure 2 and a J1 interface in the figure 4 are sockets of the earphone connecting wire respectively.

Further, on the basis of the above embodiment 1, there is provided a connecting structure of the gravity collecting unit,

as shown in fig. 5, the gravity collection unit includes four gravity sensors and two analog-to-digital conversion chips, an output terminal of the gravity sensor J1 is connected to the first input channels AINP1 and AINN1 of the analog-to-digital conversion chip U3, an output terminal of the gravity sensor J2 is connected to the second input channels AINP2 and AINN2 of the analog-to-digital conversion chip U3, a power supply terminal of the gravity sensor J1 and a power supply terminal of the gravity sensor J2 are both connected to the REFOUT pin of the analog-to-digital conversion chip U3, an output terminal of the gravity sensor J3 is connected to the first input channels AINP1 and AINN1 of the analog-to-digital conversion chip U5, an output terminal of the gravity sensor J4 is connected to the second input channels AINP2 and AINN2 of the analog-to-digital conversion chip U5, a power supply terminal of the gravity sensor J3 and a power supply terminal of the gravity sensor J4 are both connected to the REFOUT pin of the analog-to analog conversion chip U5, and the analog-to the analog-to-digital conversion chip U3 and to the clock pin and data connection unit 5.

In the embodiment, four gravity sensors are adopted, four infusion bags can be detected simultaneously, every two gravity sensors are connected with the control unit through an analog-to-digital conversion chip, the weight parameter of each infusion bag is converted into an analog electric signal and then converted into a digital signal, and the digital signal is sent to the control unit for processing, so that whether the current infusion bag is in an end-of-delivery state or not is judged. The analog-digital sensing chip is of a CS1238 type, the CS1238 is a high-precision low-power-consumption analog-digital conversion chip, two differential input channels are internally provided with a temperature sensor and a high-precision oscillator, and the analog-digital sensing chip is communicated with a single chip microcomputer through 2-wire SPI interfaces SCLK and DRDY/DOUT to be configured, such as channel selection, PGA selection, output rate selection and the like.

Further, on the basis of the above embodiment 1, there is provided a connection structure of the communication unit,

as shown in fig. 6, the communication unit includes an internet of things chip U4, an antenna ANT1, a SIM card socket IC1 and a diode integrated chip IC2, communication pins RXD and TXD of the internet of things chip U4 are both connected to the control unit, an RF _ ANT pin of the internet of things chip U4 is connected to the antenna ANT1, SIM _ DATA, SIM _ RST, SIM _ CLK, and SIM _ VDD pins of the internet of things chip U4 are connected to IO, RST, CLK, and VCC pins of the SIM card socket IC1, respectively, an IO pin of the SIM card socket IC1 is also connected to a VCC pin of the SIM card socket IC1, and IO, RST, CLK, and VCC pins of the SIM card socket IC1 are all grounded through the diode integrated chip IC 2.

During the use, the SIM card is placed into the SIM card seat IC1, the communication is established between the chip U4 of the Internet of things and the communication unit of the host computer of the nurse station by means of the SIM card and the antenna ANT1, the condition of the infusion bag can be monitored in real time, the remote feedback is given to the nurse station, an on-duty nurse can know the infusion condition of a current patient in time, and corresponding measures are taken.

Further, on the basis of the above embodiment 1, there is provided a connection structure of the power supply unit,

the power supply unit comprises a main power supply circuit and a communication power supply circuit, the main power supply circuit comprises a voltage stabilizing chip U2, an input pin VIN of the voltage stabilizing chip U2 is connected with a voltage source VDD output by a battery BAT, an enable pin EN of the voltage stabilizing chip U2 is connected with the voltage source VDD, the voltage source VDD is grounded through a capacitor C8, an output pin Vout of the voltage stabilizing chip U2 outputs a voltage source MCU _3V3, the voltage source MCU _3V3 is grounded through a capacitor C5, and a capacitor C6 is connected to the capacitor C5 in parallel; the communication power supply circuit comprises a triode Q6, a MOS tube Q5 and a voltage stabilizing diode D3, the base electrode of the triode Q6 is connected with the control unit, the emitting electrode of the triode Q6 is grounded, the collecting electrode of the triode Q6 is connected with the grid electrode of the MOS tube Q5, the source electrode of the MOS tube Q5 is connected with a voltage source VDD, the drain electrode of the MOS tube Q5 is connected with the cathode of the voltage stabilizing diode D3, the anode of the voltage stabilizing diode D3 is grounded, and the drain electrode of the MOS tube Q5 outputs a voltage source NB _ POW to supply power for the communication unit.

The main power supply circuit converts the output power supply of the battery BAT into a 3.3V stabilized power supply through the stabilized voltage chip U2 to supply power to the control unit. The communication power supply circuit enables the power supply state of the communication unit to be controlled by the control unit, when the control unit sends a high level signal to the base electrode of the triode Q6, the triode Q6 is conducted, the grid voltage of the MOS tube Q5 is reduced, the MOS tube Q6 is cut off, the communication unit cannot be powered, when the control unit sends a low level signal to the base electrode of the triode Q6, the triode Q6 is cut off, at the moment, the MOS tube Q5 is in a conducting state, and the communication unit is powered to work. And the power consumption is reduced.

Example 2

Based on the same concept as that of embodiment 1, the battery BAT is further connected to a charging circuit in this embodiment,

as shown in fig. 8, the charging circuit includes a charging chip U6, an input pin VIN of the charging chip U6 is connected to a voltage source VBUS, a BAT pin of the charging chip U6 is connected in series with a resistor R27 and then is connected as an output terminal of the charging circuit to a positive electrode B + of the battery BAT, a SW pin of the charging chip U6 is connected to the positive electrode B + of the battery BAT through an inductor L4, a TEST pin of the charging chip U6 is connected to the positive electrode B + of the battery BAT through a resistor R25, and an NTC pin of the charging chip U6 is grounded through a resistor R28.

The signal of the charging chip U6 is IP2312U, and the charging chip U6 is a 5V input IC supporting voltage reduction and charging management of a synchronous switch of a single lithium battery. The charging chip U6 integrates power MOS, and adopts synchronous switch structure, so that it only needs few peripheral devices when in use, and effectively reduces the size of the whole scheme. The working frequency of a boost switch charging converter of the charging chip U6 is 750KHz, the maximum charging current is 3A, 5V input, and the conversion efficiency of 3.7V/2A is 94%; the charging current may be set by an external resistor. The built-in soft start function of chip U6 charges prevents that the overcurrent of impulse when starting from arousing the trouble, and integrated input protection functions such as excessive pressure, undervoltage, overtemperature ensure the reliable and stable work of system. In this embodiment, the input pin of the charging chip U6 is connected to a 5V voltage source through a USB cable to charge the battery BAT.

Furthermore, the device also comprises a charging protection circuit,

as shown in fig. 9, the charging protection circuit includes a MOS transistor Q12, a protection chip U7, and a dual MOS chip U8, a negative electrode B-of the battery BAT is connected to a gate of the MOS transistor Q12, a positive electrode B + of the battery BAT is connected to a drain of the MOS transistor Q12 through a resistor R32, a source of the MOS transistor Q12 is connected to a VDD pin of the protection chip U7, a VSS pin of the protection chip U7 is also connected to a gate of the MOS transistor Q12, a DOUT pin of the protection chip U7 is connected to a G1 pin of the dual MOS chip U8, a COUT pin of the protection chip U7 is connected to a G2 pin of the dual MOS chip U8, and an S1 pin of the dual MOS chip U8 is connected to a negative electrode B-of the battery BAT, and two D12 pins of the dual MOS chip U8 are connected.

In this embodiment, U8 is a dual channel serial NMOS transistor. When the voltage of the pin 5 of the protection chip U7 is between 2.3 and 4.4, the

pins

1 and 3 output high level to act on the

pins

4 and 6 and U8, at this time, two NMOS inside the U8 are all conducted, B-is connected with GND, and the whole power supply system can form an electric loop to supply power normally. When pin 5 of U7 is above 4.4V (overcharged), pin 3 is low. When the pin 5 of U7 is below 2.3V (over-discharge), pin 1 is low. In both cases, only one of the two NMOS transistors in U8 is conductive, and B-and GND do not form a loop, so that B-is equivalent to a floating pin, and the whole system is powered off. The MOS transistor Q12 is a PMOS transistor and is used for preventing reverse connection of the battery. When the battery is normally connected, VS > VG of Q12 meets the conduction condition of Q12, and Q12 is conducted and works normally. When the battery is connected reversely, VG > VS of Q12, Q12 cannot be conducted, U7 cannot normally supply power, pins 1 and 3 output low levels, an NMOS tube in U8 is not conducted, B- (actually B + is not conducted) and GND are not conducted, one end of a battery BAT is a suspended pin in the whole circuit system, the system cannot supply power, and the effect of protecting a rear-stage load and a front-stage charging circuit is achieved.

Example 3

As shown in fig. 10, on the basis of examples 1 and 2,

the refined control system of the infusion monitor in the embodiment further comprises a switching-on and switching-off control unit, the switching-on and switching-off control unit comprises a triode Q9, a double diode D5, a MOS transistor Q8 and a switch KEY KEY, the base of the triode Q9 is used as the input end of the switching-on and switching-off control unit to be connected with the control unit, the emitter of the triode Q9 is grounded, the collector of the triode Q9 is connected with the positive pole B + of the battery BAT through a resistor R30, one end of the switch KEY KEY is grounded, the other end of the switch KEY KEY is connected with the cathode of the double diode D5, the first anode of the double diode D5 is connected with the grid of the MOS transistor Q8, the second anode of the double diode D5 is used as the output end of the switching-on and switching-off control unit to be connected with the control unit, the output end of the switching-on and switching-off control unit is further connected with a VDD voltage source through a resistor R31, the source of the MOS transistor Q8 is connected with the positive pole B + of the battery BAT, and the drain of the MOS transistor Q8 is connected with the VDD voltage source.

The starting process comprises the following steps:

the switch KEY is a non-self-locking KEY, when the switch KEY is pressed down, two diodes of the double diode D5 are all turned on, and the switch control unit forms a loop of B + → R30 → D5 → KEY → GND. The conduction voltage drop of the double diode D5 is calculated according to 0.7, VS of the MOS tube Q8 is greater than VG, Q8 is conducted to form a B + → Q8 → VDD loop, power is supplied to the whole electric control system, after the control unit is electrified, a high-level CTRL is output to the base electrode of the triode Q9, the triode Q9 is conducted, the grid electrode of the MOS tube Q8 is grounded through the triode Q9, the switch KEY KEY is loosened at the moment, the conduction condition of the MOS tube Q8 is not changed, and the circuit still works normally.

Shutdown process:

in the normal working process of the system, R31 is a pull-up resistor, and TEST is a detection signal of the control unit.

When the KEY is pressed at this time, TEST is at low level under the action of D5, and the control unit detects that the level of the pin changes, the control unit outputs low level at CTRL pin to turn off Q9, and turns off the path of Q8 gate → Q9 → GND, but at this time, because the switch KEY is pressed, the gate of MOS transistor Q8 can still be kept at low level, and the system still works normally. In this state, when the switch KEY is released, the two paths of grounding paths of the gate of the MOS transistor Q8 are all disconnected, VG is VS under the pull-up action of R30, the on condition cannot be formed, the MOS transistor Q8 is turned off, the whole system is powered off, and the shutdown operation is completed.

At this time, the starting process is changed into:

when the KEY is pressed, the two diodes of the double diode D5 are all turned on, and the switch control unit forms a loop of B + → R30 → D5 → KEY → GND. The conduction voltage drop of the double diode D5 is calculated according to 0.7, VS > VG of the MOS transistor Q8, Q8 is conducted, and due to the fact that a USB is not connected, VG of the MOS transistor Q5 is 0V under the action of the pull-down resistor R14, a parasitic diode of the MOS transistor Q5 is conducted, so VS > VG of the Q5 is conducted, and the MOS transistor Q5 is also conducted, so that a B + → Q8 → Q5 → VDD loop is formed, power is supplied to the whole electronic control system, after the control unit is powered on, a high level is output to CTRL, the transistor Q9 is conducted, the gate of the MOS transistor Q8 is grounded through the transistor Q9, at this time, the switch KEY is released, the conduction condition of the MOS transistor Q8 is not changed, and the circuit still works normally.

The MOS transistor Q5, the diode D8 and the resistor R14 realize the power supply switching function.

When the charging interface has no USB access, the circuit operates as described above, and the battery BAT current does not flow to VBUS because of the unidirectional conduction of the diode D8. When the charging interface is connected to the USB, the gate voltage VG of the MOS transistor Q5 is 5V, the diode D8 is turned on, VS ≈ 4.3V, VS < VG, and the MOS transistor Q5 is turned off, no matter whether the switch KEY is activated or deactivated, no matter whether the CTRL level state is high or low, B + cannot form a loop with the VDD voltage source through the MOS transistor Q5, and the power supply loop of the system is VBUS → D8 → VDD at this time. When the USB is accessed, if the electric control system is in a shutdown state, the electric control system can be automatically started and cannot be shut down through the keys. Namely: when the USB is connected, the Q8, the R30, the D5, the Q9 and the switch KEY are shielded and do not work.

The power supply unit is not directly connected with the output voltage of the battery BAT, but the output voltage of the battery BAT is firstly output to the VDD voltage source through the on-off control unit and then is used for supplying power to other units, or is further processed to supply power to other units through the power supply unit.

Further, as shown in FIG. 11,

the alarm device further comprises an alarm unit, the alarm unit comprises a triode Q3 and a buzzer BEE1, the base electrode of the triode Q3 is connected with the control unit, the emitting electrode of the triode Q3 is grounded, the collecting electrode of the triode Q3 is connected with the negative electrode of the buzzer BEE1, the positive electrode of the buzzer BEE1 is connected with a 3.3V voltage source, and a capacitor C7 is connected between the positive electrode and the negative electrode of the buzzer BEE1 in parallel.

After the control unit collects and processes the electric signal of the weight measuring sensor 4, the weight of the liquid in the infusion bag at the moment is judged to reach a threshold value, the needle needs to be pulled out, a high-level signal is output to the triode Q3, the triode Q3 is driven to be conducted, the buzzer BEE1 is further conducted, the patient or accompanying family members are reminded in time, the nurse is called to pull out the needle, and double guarantee is formed with the reminding of the nurse station. Wherein the capacitor C7 plays a filtering role.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Infusion monitor control system that becomes more meticulous, including power supply unit, the control unit and gravity collection unit, the communication unit who is connected with the control unit, the power supply unit is used for providing DC power supply, the control unit with the help of communication unit and nurse station host communication, its characterized in that still includes electric capacity collection unit, electric capacity collection unit includes electric capacity sensing chip U11 and electric capacity response strip, electric capacity response strip sets up on the transfer line, connect behind electric capacity sensing chip U11's CX pin series resistance RX electric capacity response strip, electric capacity sensing chip U11's OUT pin does electric capacity collection unit's output is connected the control unit, electric capacity sensing chip U11's OUT pin still connects the VCC voltage source through pull-up resistance RU.

2. The infusion monitor refinement control system of claim 1, wherein the gravity acquisition unit comprises a plurality of paths with the same circuit structure, one of the paths comprises an analog-to-digital conversion chip U3, a first input channel AINP1 and an AINN1 of the analog-to-digital conversion chip U3 are used for being connected with an output terminal of the first gravity sensor, a clock pin SCLK and a data pin DRDY/DOUT of the analog-to-digital conversion chip U3 are both connected with the control unit, and a refut pin of the analog-to-digital conversion chip U3 is connected with a power supply terminal of the first gravity sensor.

3. The infusion monitor refined control system according to claim 1, wherein the communication unit includes an internet of things chip U4, an antenna ANT1, a SIM card holder IC1 and a diode integrated chip IC2, communication pins RXD and TXD of the internet of things chip U4 are both connected to the control unit, an RF _ ANT pin of the internet of things chip U4 is connected to the antenna ANT1, SIM _ DATA, SIM _ RST, SIM _ CLK, and SIM _ VDD pins of the internet of things chip U4 are connected to IO, RST, CLK, and VCC pins of the SIM card holder IC1, an IO pin of the SIM card holder IC1 is further connected to a VCC pin of the SIM card holder IC1, and IO, RST, CLK, and VCC pins of the SIM card holder IC1 are all grounded through the diode integrated chip IC 2.

4. The infusion monitor refinement control system according to claim 1, wherein the power supply unit comprises a main power supply circuit, the main power supply circuit comprises a voltage regulation chip U2, an input pin VIN of the voltage regulation chip U2 is connected with a voltage source VDD, an enable pin EN of the voltage regulation chip U2 is connected with the voltage source VDD, the voltage source VDD is grounded through a capacitor C8, an output pin Vout of the voltage regulation chip U2 outputs a voltage source MCU _3V3, the voltage source MCU _3V3 is grounded through a capacitor C5, and a capacitor C6 is connected to the capacitor C5 in parallel.

5. The infusion monitor refinement control system of claim 4, wherein the power supply unit further comprises a communication power supply circuit, the communication power supply circuit comprises a transistor Q6, a MOS transistor Q5 and a Zener diode D3, a base of the transistor Q6 is connected to the control unit, an emitter of the transistor Q6 is grounded, a collector of the transistor Q6 is connected to a gate of the MOS transistor Q5, a source of the MOS transistor Q5 is connected to the voltage source VDD, a drain of the MOS transistor Q5 is connected to a cathode of the Zener diode D3, an anode of the Zener diode D3 is grounded, and a drain of the MOS transistor Q5 outputs a voltage source NB _ POW to power the communication unit.

6. The infusion monitor refinement control system of claim 1, further comprising a charging circuit, the charging circuit comprising a charging chip U6, an input pin VIN of the charging chip U6 is connected to a voltage source VBUS, a BAT pin of the charging chip U6 is connected in series with a resistor R27 and then is connected to an anode B + of the battery BAT as an output end of the charging circuit, a SW pin of the charging chip U6 is connected to an anode B + of the battery BAT through an inductor L4, a TEST pin of the charging chip U6 is connected to the anode B + of the battery BAT through a resistor R25, and an NTC pin of the charging chip U6 is grounded through a resistor R28.

7. The infusion monitor refinement control system of claim 6, further comprising a charge protection circuit, the charging protection circuit comprises a MOS tube Q12, a protection chip U7 and a double-MOS tube chip U8, the negative electrode B-of the battery BAT is connected with the grid electrode of the MOS tube Q12, the positive electrode B + of the battery BAT is connected with the drain electrode of the MOS tube Q12 through a resistor R32, the source electrode of the MOS tube Q12 is connected with the VDD pin of the protection chip U7, the VSS pin of the protection chip U7 is also connected with the gate electrode of the MOS tube Q12, the DOUT pin of the protection chip U7 is connected with the G1 pin of the dual MOS chip U8, the COUT pin of the protection chip U7 is connected with the G2 pin of the dual MOS chip U8, the S1 pin of the dual MOS chip U8 is connected with the cathode B-of the battery BAT, and the two D12 pins of the dual MOS chip U8 are connected.

8. The infusion monitor refinement control system of claim 1, further comprising a switch control unit, wherein the switch control unit comprises a transistor Q9, a dual diode D5, a MOS transistor Q8 and a switch KEY, a base of the transistor Q9 is used as an input terminal of the switch control unit and connected to the control unit, an emitter of the transistor Q9 is grounded, a collector of the transistor Q9 is connected to a positive B + of the battery BAT through a resistor R30, one end of the switch KEY is grounded, the other end of the switch KEY is connected to a cathode of the dual diode D5, a first anode of the dual diode D5 is connected to a gate of the MOS transistor Q8, a second anode of the dual diode D5 is used as an output terminal of the switch control unit and connected to the control unit, an output terminal of the switch control unit is further connected to a voltage source through a resistor R31, the source electrode of the MOS tube Q8 is connected with the anode B + of the battery BAT, and the drain electrode of the MOS tube Q8 is connected with a VDD voltage source.

9. The refinement control system of infusion monitor of claim 8, wherein the on-off control unit further comprises a MOS transistor Q5, a diode D8 and a resistor R14, the MOS transistor Q5 is connected in series between the MOS transistor Q8 and a VDD voltage source, the drain of the MOS transistor Q5 is connected to the drain of the MOS transistor Q8, the source of the MOS transistor Q5 is connected to the VDD voltage source, the gate of the MOS transistor Q5 is connected to the charging interface, the gate of the MOS transistor Q5 is further grounded through the resistor R14, the anode of the diode D8 is connected to the charging interface, and the cathode of the diode D8 is connected to the VDD voltage source.

10. The infusion monitor refinement control system according to claim 1, further comprising an alarm unit, wherein the alarm unit comprises a transistor Q3 and a buzzer be 1, a base of the transistor Q3 is connected with the control unit, an emitter of the transistor Q3 is grounded, a collector of the transistor Q3 is connected with a cathode of the buzzer be 1, an anode of the buzzer be 1 is connected with a 3.3V voltage source, and a capacitor C7 is connected between the anode and the cathode of the buzzer be 1 in parallel.