CN111632227B

CN111632227B - Infusion monitoring control system and device

Info

Publication number: CN111632227B
Application number: CN202010324393.7A
Authority: CN
Inventors: 罗云汉; 熊奕然
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2022-12-06
Anticipated expiration: 2040-04-23
Also published as: CN111632227A

Abstract

The invention provides an infusion monitoring and controlling system and device, which not only can monitor and control the infusion process, but also can simultaneously realize the monitoring and controlling of an infusion system with a plurality of bottles (bags) of infusion, and meet the requirements of carrying out infusion in various combined modes (such as timing switching, quantitative switching and empty medicine bottle switching), realize automatic and accurate infusion to a certain extent, and reduce the working pressure of medical personnel. The infusion monitoring control system comprises: the system comprises a liquid medicine detection subsystem, a measurement control subsystem and a flow control executing mechanism; the liquid medicine detection subsystem monitors whether liquid medicine in the infusion tube exists or not in real time through a capacitive liquid medicine sensor, and monitors the dropping speed and the dropping number of liquid medicine drops in the dropping funnel in real time through a photoelectric liquid medicine sensor; and the flow control actuating mechanism is used for opening or closing the infusion pipeline under the control of the measurement control subsystem.

Description

Infusion monitoring control system and device

Technical Field

The invention relates to a control system, in particular to an infusion monitoring control system, and belongs to the field of auxiliary medical care instruments.

Background

During infusion, if the completion of infusion of the liquid medicine is not found in time, blood can flow back to the infusion apparatus, so that a patient or a nursing person needs to observe the liquid level of the liquid medicine constantly during infusion, mental burden is brought to the patient or the nursing person, and time of the nursing person is wasted; when the liquid medicine is about to be infused, a nurse must go to the site for treatment immediately, and if a plurality of patients are in the same time, the nurse is in tension in treatment work; when the needle leakage occurs, the liquid medicine is injected out of the blood vessel, and if the infusion is stopped and treated in time, the pain is brought to the patient; when multi-branch infusion is performed, infusion needs to be switched among different branch pipes at regular time sometimes, and infusion needs to be switched among different branch pipes at fixed quantity sometimes, and manual switching is completely performed, so that large workload and pressure are brought to medical staff; the infusion process is not recorded in real time, and when the infusion process needs to be verified, convincing evidence is not provided.

At present, no equipment for completely solving the problems is available, and the following three products can be used for solving the partial problems: one is to judge whether the transfusion is finished by using the weight change of the liquid medicine before and after the transfusion is finished; a method for monitoring the motion of medicine drop at the dropping funnel to judge whether the transfusion is finished; the other is that the transfusion tube is used for monitoring whether the liquid medicine exists or not to judge whether the transfusion is finished or not. The above products have the following drawbacks: the first method is to know the weight of the liquid medicine and set the weight of the liquid medicine when in use; the second type can only monitor a single bottle (bag) of liquid medicine; the third method only can monitor the existence of the liquid medicine, has no automatic treatment measures and has single function. The prior transfusion monitoring controller (or similar products) can only monitor one bottle (bag), and has the problem of mismatching with the prior transfusion system.

Disclosure of Invention

In view of the above, the present invention provides an infusion monitoring and control system, which not only can monitor and control the infusion process, but also can simultaneously monitor and control an infusion system with multiple bottles (bags) of infusion, and meet the requirements of multiple combined infusion (such as timing switching, quantitative switching, and empty switching of medicine bottles), so as to achieve automatic and accurate infusion to a certain extent, and reduce the working pressure of medical staff.

The infusion monitoring control system comprises: the system comprises a liquid medicine detection subsystem, a measurement control subsystem and a flow control executing mechanism;

the liquid medicine detection subsystem includes: a capacitive liquid medicine sensor circuit and a photoelectric liquid medicine sensor circuit; the circuit of the capacitive liquid medicine sensor is arranged on a liquid conveying pipe between a liquid conveying bottle and a dropping funnel on the liquid conveying pipe, the existence of liquid medicine in the liquid conveying pipe is monitored in real time through the capacitive liquid medicine sensor, and when no liquid medicine exists in the liquid conveying pipe, the capacitance capacity of the capacitive liquid medicine sensor is changed;

the photoelectric liquid medicine sensor circuit is arranged on the dropping funnel, and the dropping speed and the dropping number of the liquid medicine drops in the dropping funnel are monitored in real time through the photoelectric liquid medicine sensor;

detection signals of the capacitance type liquid medicine sensor circuit and the photoelectric type liquid medicine sensor circuit are both output to the measurement control subsystem; the flow control executing mechanism opens or closes the infusion pipeline according to the received control instruction of the measurement control subsystem;

when the measurement control subsystem sends a control instruction for opening the infusion pipeline to the flow control executing mechanism, the flow control executing mechanism opens the infusion pipeline;

in the infusion process, if the measurement control subsystem judges that the dropping speed of the medicine drops exceeds a set range according to the output signal of the photoelectric medicine liquid sensor circuit, a control instruction for shutting off an infusion pipeline is sent to the flow control execution mechanism, and the infusion pipeline is shut down after the flow control execution mechanism receives the control instruction;

when the measurement control subsystem judges that no liquid medicine exists in the liquid conveying pipe according to the output signal of the capacitance type liquid medicine sensor circuit, a control instruction for shutting off the liquid conveying pipeline is sent to the flow control actuating mechanism, and the liquid conveying pipeline is shut off after the flow control actuating mechanism receives the control instruction.

When the monitored infusion system has more than two liquid bottles: the number of the capacitance type liquid medicine sensor circuits is the same as that of branch infusion tubes in the monitored infusion system, and the capacitance type liquid medicine sensor circuits are in one-to-one correspondence, and each capacitance type liquid medicine sensor circuit is arranged on the corresponding branch infusion tube to measure the existence of liquid medicine in the branch infusion tube; the photoelectric liquid medicine sensor circuit is arranged on a dropping funnel of the main infusion tube and is used for measuring the dropping speed and the dropping number of liquid medicine drops in the dropping funnel; the main infusion tube and each branch infusion tube are correspondingly provided with a flow control actuating mechanism which is used for controlling the opening or closing of the corresponding main infusion tube or branch infusion tube.

When the monitored infusion system has more than two liquid bottles:

if the infusion mode is timing switching:

after the dripping speed is adjusted on the main infusion tube, setting switching duration in the measurement control subsystem, and then controlling flow control execution mechanisms on all branch infusion tubes except the branch infusion tube for the first infusion to close the corresponding branch infusion tube through the measurement control subsystem to deliver the liquid medicine in the liquid medicine bottle for the first infusion; when the set switching time length is reached, the measurement control subsystem controls a flow control execution mechanism on a main infusion tube to close the main infusion tube, then controls a branch infusion tube of a second infusion tube to open, then controls a branch infusion tube of a first infusion tube to close, and finally controls the main infusion tube to open to deliver the liquid medicine in a liquid medicine bottle of the second infusion tube; the timing switching is realized by analogy in sequence;

if the infusion mode is quantitative switching:

after the dripping speed on the main infusion tube is adjusted, the switching medicine quantity is set in the measurement control subsystem, and the measurement control subsystem automatically calculates the switching dripping quantity according to the set switching medicine quantity and the known volume of single-drop liquid medicine; then the measurement control subsystem controls flow control actuating mechanisms on all branch infusion tubes except the branch infusion tube of the first infusion to close the corresponding branch infusion tube, and the liquid medicine in the liquid medicine bottle of the first infusion is infused; after infusion is started, the measurement control subsystem records the number of drops of the liquid medicine in real time according to an output signal of the photoelectric liquid medicine sensor circuit, when the number of drops of the liquid medicine reaches a set switching drop number, the measurement control subsystem controls a flow control executing mechanism on a main infusion tube to close the main infusion tube, then controls a branch infusion tube for second infusion to open, then controls a branch infusion tube for first infusion to close, and finally controls the main infusion tube to open to deliver liquid medicine in a liquid medicine bottle for second infusion; by analogy, quantitative switching is realized;

if the infusion mode is empty switching of the medicine bottle:

after the dripping speed is adjusted on the main infusion tube, the measurement control subsystem controls flow control actuating mechanisms on all branch infusion tubes except for the branch infusion tube of the first infusion to close the corresponding branch infusion tube, and the liquid medicine in a liquid medicine bottle of the first infusion is infused; when the measurement control subsystem judges that no liquid medicine exists in the branch infusion tube according to a signal output by a capacitive liquid medicine sensor circuit on the branch infusion tube for the first infusion, the measurement control subsystem controls a flow control executing mechanism on a main infusion tube to close the main infusion tube, then controls a branch infusion tube for the second infusion to open, then controls a branch infusion tube for the first infusion to close, and finally controls the main infusion tube to open to deliver liquid medicine in a liquid medicine bottle for the second infusion; by analogy, empty switching of the medicine bottles is realized;

in the infusion process, the photoelectric liquid medicine sensor circuit monitors the dropping speed of the dropping funnel in real time, and if the measurement control subsystem judges that the dropping speed of the medicine is beyond a set range according to an output signal of the photoelectric liquid medicine sensor circuit, the main infusion tube and all branch infusion tubes are closed; if the dropping speed is always in the set range, the main infusion tube and all branch infusion tubes are closed when the infusion ending time is reached or no liquid medicine is in the infusion tube corresponding to the liquid medicine bottle of the last infusion, and the infusion is finished.

Further, based on the infusion monitoring control system, the present invention provides an infusion monitoring control device including: the branch pipe measurement and control box is connected with the main electronic box through a cable to transmit signals; the liquid medicine detection subsystem, the measurement control subsystem and the flow control actuating mechanism are integrally installed in the branch pipe measurement and control box and the main electronic box;

a branch pipe flow control actuating mechanism, a channel for a branch infusion tube to pass through and a liquid medicine detection subsystem circuit board are arranged in the branch pipe measurement and control box; the branch pipe flow control actuating mechanism comprises: the device comprises a steering engine A, a pressure head A and a pressure groove A; the capacitance type liquid medicine sensor circuit is arranged on the liquid medicine detection subsystem circuit board;

the pressure groove A is a groove arranged on a channel for the branch infusion tube to pass through;

the pressure head A is arranged on an output shaft of the steering engine A, the position of the pressure head A corresponds to the position of the pressure groove A, and the pressure head A can be pressed into the pressure groove A under the driving of the steering engine A to enable the branch infusion tube to deform under pressure so as to shut off the branch infusion tube or adjust the flow of liquid medicine in the branch infusion tube;

a drip chamber positioning groove, a drip chamber observation window, a channel for the main infusion tube to pass through, a photoelectric liquid medicine sensor clamping groove, a main infusion tube flow control actuating mechanism, a display control computer, an interface circuit board and a power supply are arranged in the main electronic box;

the dropping funnel positioning groove is used for placing a dropping funnel on the main infusion tube; the drip chamber observation window is arranged at a position corresponding to the drip chamber positioning groove and used for observing the drip chamber from the outside; the photoelectric liquid medicine sensor clamping groove is used for mounting a photoelectric liquid medicine sensor, and a circuit for enabling the photoelectric liquid medicine sensor to work is integrated on the interface circuit board;

the main infusion tube flow control actuating mechanism comprises: the steering engine B, the pressure head B and the pressure groove B; the pressure groove B is a groove arranged on a channel for the main infusion tube to pass through; the pressure head B is arranged on an output shaft of the steering engine B, the position of the pressure head B corresponds to that of the pressure groove B, and the pressure head B can be driven by the steering engine B to rotate and press into the pressure groove B, so that the main infusion tube is pressed and deformed to shut off the main infusion tube or adjust the flow of liquid medicine in the main infusion tube;

the display control computer is used for receiving detection signals of the capacitance type liquid medicine sensor circuit and the photoelectric type liquid medicine sensor circuit and sending control instructions to the branch pipe flow control actuating mechanism and the main infusion pipe flow control actuating mechanism; and the display and control computer is also used for inputting working parameters, displaying the parameters and storing information of the working process of the infusion system.

The branch pipe measurement and control box and the main electronic box comprise an upper box and a lower box, and the upper box and the lower box are buckled relatively to form a whole.

The capacitance type liquid medicine sensor includes: the electrode CT1 and the electrode CT2, wherein the electrode CT2 is installed in an electrode groove of an upper box of the branch pipe measurement and control box, the electrode CT1 and a liquid medicine detection circuit in a capacitive liquid medicine sensor circuit are integrated on a liquid medicine detection subsystem circuit board, the liquid medicine detection subsystem circuit board is installed in a lower box of the branch pipe measurement and control box, and when the upper box of the branch pipe measurement and control box and the lower box of the branch pipe measurement and control box are oppositely buckled, the electrode CT1 is opposite to the electrode CT2 to form a capacitive liquid medicine sensor;

the electrode CT1 includes: the electrode CT1-1 and the electrode CT1-2 are positioned on the same straight line, the capacitor formed by the electrode CT1-1 and the electrode CT2 is connected with the capacitor formed by the electrode CT1-2 and the electrode CT2 in series, so that the CT1-1, the CT1-2 and the CT2 form a series equivalent capacitor CT, and the capacity of the capacitor CT is changed by the existence of liquid medicine.

When the monitored infusion system has more than two liquid bottles: and a branch pipe measurement and control box is connected to the branch infusion pipe corresponding to each liquid medicine bottle, the main electronic box is connected to the position of the dropping funnel on the main infusion pipe, and all the branch pipe measurement and control boxes are connected with the main electronic box through cables respectively.

The liquid medicine detection circuit includes: the device comprises a signal source circuit, an emitter follower circuit, a capacitance type liquid medicine sensor, an alternating current amplification circuit, a rectification circuit, a voltage conversion circuit and a direct current amplification circuit;

the signal source circuit is used for generating a sinusoidal signal, and the generated sinusoidal signal is subjected to impedance transformation by the emitter follower unit circuit and then is transmitted to the alternating current amplifying circuit through the capacitance type liquid medicine sensor; the signal amplified by the AC amplifying circuit is transmitted to a rectifying circuit; the rectifying circuit rectifies and filters the received signal to form a direct current signal output voltage conversion circuit; the voltage conversion circuit converts the received direct-current voltage signal into a direct-current voltage signal with the power ground as the ground and outputs the direct-current voltage signal to the direct-current amplification circuit; the DC amplifying circuit amplifies the received DC voltage signal with the power ground as the ground and outputs the amplified DC voltage signal as the output signal of the capacitive liquid medicine detection sensor circuit.

An APP for information interaction with a display control computer in a main electronic box is arranged on the handheld terminal, and the APP is used for setting working parameters of the infusion monitoring control system, receiving working state parameters of the infusion monitoring control system, and directly opening/closing a main infusion tube and a branch infusion tube; the setting of the working parameters comprises setting of an infusion mode.

Has the advantages that:

(1) The infusion monitoring and control system can monitor and control the infusion process of an infusion system with more than one infusion bottle (bag), and medical staff and nursing staff do not need to pay attention to the infusion process excessively after the infusion is started and before the infusion is finished, so that the workload of the medical staff is reduced, the pressure of the medical staff and the nursing staff is reduced, and the time of the medical staff and the nursing staff is saved.

(2) Can meet the requirements of infusion in various combination modes, realizes automatic and accurate infusion to a certain extent, and is beneficial to the exertion of the function of liquid medicine.

(3) The control system stops infusion when monitoring needle leakage, thereby relieving the pain of the patient.

(4) Can realize the real-time record of the whole process of infusion, improve the informatization degree of medical equipment, be beneficial to the fine management of hospitals, and be convenient for check when needed.

(5) Because two electrodes for forming the capacitance type liquid medicine sensor CT are respectively arranged on the upper box and the lower box of the branch pipe measurement and control box, if wires are welded on the electrodes of the upper box and the lower box of the branch pipe measurement and control box, the production is inconvenient; the capacitance type liquid medicine sensor CT adopts a mode of connecting two capacitors in series, the two capacitors connected in series share one electrode, and the other electrode is directly integrated on a corresponding circuit board, so that the production is convenient, and the technical problem of products is solved.

Drawings

FIG. 1 is a block diagram of the components of the infusion monitoring control system of the present invention;

FIG. 2 is a schematic structural view of a branch pipe measurement and control box;

FIG. 3 is a schematic diagram of a capacitive sensor;

FIG. 4 is a schematic diagram of a main electronic box structure;

FIG. 5 is a schematic view of the infusion monitor control system in use with an infusion system having two vials;

fig. 6 is a schematic diagram of a liquid medicine detection circuit in the capacitive liquid medicine sensor circuit.

Wherein: 1-a liquid medicine bottle A, 2-a liquid medicine bottle B, 3-a branch pipe measurement and control box A, 4-a branch pipe measurement and control box B, 5-a main electronic box, 6-an interface circuit board, 7-a power supply, 8-a dropping funnel positioning groove, 9-a dropping funnel observation window, 10-a main liquid medicine pipe channel, 11-a main liquid medicine pipe limiting boss, 12-a photoelectric liquid medicine sensor PES clamping groove, 13-a steering engine A, 14-a pressure head A, 15-a pressure groove A, 16-a liquid medicine pipe, 17-a main liquid medicine pipe, 23-a steering engine B, 24-a pressure head B, 25-a pressure groove B, 26-a liquid medicine detection subsystem circuit board, 27-an electrode channel, 28-a liquid medicine pipe channel, 29-a liquid medicine pipe limiting boss, 30-a measurement control subsystem and 31-a photoelectric liquid medicine sensor PES

Detailed Description

The invention is described in detail below by way of example with reference to the accompanying drawings.

Example 1:

the present embodiment provides a non-contact infusion monitoring control system that can automatically monitor and control the infusion process.

As shown in fig. 1, the infusion monitor control system includes: the system comprises a liquid medicine detection subsystem, a measurement control subsystem and a flow control execution mechanism.

Wherein liquid medicine detects the subsystem and includes: a capacitive liquid medicine sensor circuit and a photoelectric liquid medicine sensor circuit;

the capacitance type liquid medicine sensor circuit is arranged on a liquid conveying pipe between a liquid conveying bottle and a dropping funnel on the liquid conveying pipe and is used for monitoring whether liquid medicine exists in the liquid conveying pipe in real time (namely monitoring whether the liquid medicine exists in the liquid conveying pipe); the method comprises the following steps: a capacitance type liquid medicine sensor CT and a liquid medicine detection circuit; the capacitance type liquid medicine sensor CT includes: the capacitance formed by the electrode CT2 and the electrode CT1 is the capacitance type liquid medicine sensor CT; the capacitance of the capacitance type liquid medicine sensor CT is related to the existence of liquid medicine, when no liquid medicine exists in the infusion tube, the capacitance of the capacitance type liquid medicine sensor CT is changed, the capacity of the capacitance type liquid medicine sensor CT for transmitting alternating current signals is changed, and therefore the existence of the liquid medicine in the infusion tube can be judged through the capacity of the capacitance type liquid medicine sensor CT for transmitting the alternating current signals. The liquid medicine detection circuit provides a source signal required by the operation of the capacitance type liquid medicine sensor CT, amplifies and converts the source signal passing through the capacitance type liquid medicine sensor CT to form a direct current voltage signal which is used as an output signal of the capacitance type liquid medicine sensor circuit and is output to the measurement control subsystem.

The photoelectric liquid medicine sensor circuit is arranged on the dropping funnel and used for measuring the speed of the liquid medicine drops in the dropping funnel, namely the dropping speed (unit is drop/minute) and the quantity of the liquid medicine drops, namely the dropping quantity; the method comprises the following steps: a photoelectric type liquid medicine sensor PES and a dropping speed detection circuit; the photoelectric liquid medicine sensor PES is a photoelectric switch (comprising a light emitting diode and a photosensitive diode), and outputs high level when no liquid drop exists on the light path of the photoelectric liquid medicine sensor PES, and outputs low level when liquid drops exist on the light path of the photoelectric liquid medicine sensor PES; therefore, when the medicine drops uniformly drop through the photoelectric medicine liquid sensor PES, the photoelectric medicine liquid sensor PES can output pulse signals with certain frequency, the frequency of the pulse signals is the dropping speed, and the number of low levels in the pulse signals is the dropping number; meanwhile, whether medicine drops drip in the dropping funnel can be judged through the output signal of the photoelectric type medicine liquid sensor PES; the dripping speed detection circuit is used for providing working current for a light emitting diode in the photoelectric liquid medicine sensor PES and providing working voltage for a photosensitive diode so as to ensure the normal work of the photoelectric liquid medicine sensor PES. The photoelectric liquid medicine sensor PES outputs signals to the measurement control subsystem.

The measurement control subsystem includes: the interface circuit and the display control computer; the interface circuit is used for level conversion between a digital signal and an analog signal, and converting an output signal of the capacitive liquid medicine sensor circuit and an output signal of the photoelectric liquid medicine sensor PES into a numerical value level signal; the display and control computer is used for inputting working parameters, displaying the parameters, sending control instructions to the flow control executing mechanism, storing working process information, communicating and the like.

The flow control actuating mechanism is used for opening or closing the infusion pipeline under the control of the display control computer (receiving the control instruction of the display control computer).

The infusion monitoring control system has the working principle that:

the liquid medicine detection subsystem sends an output signal of the capacitive liquid medicine sensor circuit and an output signal of the photoelectric liquid medicine sensor PES to the measurement control subsystem; the measurement control subsystem digitizes the received output signal of the capacitive liquid medicine sensor circuit, thereby obtaining a digitized liquid medicine existence signal; calculating the dropping speed of the medicine drops according to a pulse signal output by a photoelectric type medicine liquid sensor PES, and carrying out averaging processing on the dropping speed of the medicine drops to obtain an average value of the dropping speed of the medicine drops;

for infusion systems with only one bottle of drug solution:

in the infusion process, if a needle missing event occurs, the dropping speed of the medicine drops is abnormal (namely exceeds a set range), the measurement control subsystem sends a control instruction for shutting off the infusion pipeline to the flow control execution mechanism through the display control computer, and the flow control execution mechanism shuts off the infusion pipeline after receiving the control instruction;

when the measurement control subsystem judges that no liquid medicine exists in the liquid conveying pipe according to the output signal of the capacitive liquid medicine sensor circuit, the liquid conveying is finished, a control instruction for shutting off the liquid conveying pipeline is sent to the flow control executing mechanism through the display control computer, and the liquid conveying pipeline is shut off after the flow control executing mechanism receives the control instruction.

To the infusion system who has more than two liquid medicine bottles, infusion system includes more than two liquid medicine bottles promptly, and every liquid medicine bottle communicates with main transfer line through a branch transfer line, and the drip chamber is located main transfer line: the number of the capacitance type liquid medicine sensor circuits is the same as that of the branch transfusion tubes in the monitored transfusion system, and the capacitance type liquid medicine sensor circuits are in one-to-one correspondence, and each capacitance type liquid medicine sensor circuit is arranged on the corresponding branch transfusion tube to measure the existence of liquid medicine in the branch transfusion tube; the main infusion tube and each branch infusion tube are correspondingly provided with a flow control actuating mechanism for controlling the opening or closing of the corresponding main infusion tube or branch infusion tube; the photoelectric liquid medicine sensor circuit is arranged on the dropping funnel and used for measuring the dropping speed and the dropping number of the liquid medicine drops in the dropping funnel.

The infusion monitoring control system has the common infusion modes of timing switching, quantitative switching and empty switching of a medicine bottle for an infusion system with more than two medicine bottles, and the working principle of the infusion monitoring control system at the moment is as follows:

when the infusion mode is switched regularly:

all the liquid medicine bottles except the first sequence position (the liquid medicine bottle for the first transfusion) are closed through the flow control actuating mechanism (at the moment, only the main transfusion pipe and the branch transfusion pipe corresponding to the liquid medicine bottle in the first sequence position are in an open state); then, the medical staff pricks the needle of the patient according to the traditional mode, the dropping speed is adjusted on the main infusion tube, and the dropping speed is confirmed on the display control computer; then, setting the infusion mode on the display control computer as timing switching, determining the switching time (such as 30 minutes), and pressing a start button; when the set switching time length is reached, the display control computer firstly closes the main infusion tube, then opens the branch infusion tube corresponding to the liquid medicine bottle in the second sequence, then closes the branch infusion tube corresponding to the liquid medicine bottle in the first sequence, and finally opens the main infusion tube (the sequence can prevent air from entering the infusion tube); and the like in turn, so as to realize the timing switching.

When the infusion mode is quantitative switching:

all the liquid medicine bottles except the first sequence position (the liquid medicine bottle for the first transfusion) are closed through the flow control actuating mechanism (at the moment, only the main transfusion pipe and the branch transfusion pipe corresponding to the liquid medicine bottle in the first sequence position are in an open state); then the medical staff pricks the needle for the patient according to the traditional mode, the dropping speed is adjusted on the main infusion tube, and the dropping speed is confirmed on the display control computer; then, setting the infusion mode as quantitative switching on a display control computer, and quantitatively switching the volume of the liquid medicine (namely, switching the medicine quantity, automatically calculating the switching drop number by a measurement control subsystem according to the set switching medicine quantity and the known volume of the single drop of liquid medicine, if the quantitative switching is 100 milliliters, and one drop of liquid medicine is 0.1 milliliter, the switching drop number is 100/0.1=1000 drops), and pressing a start button; after infusion is started, the measurement control subsystem starts to count the number of drops, when the number of the drops of the liquid medicine reaches the set switching number of drops, the fact that the infusion amount reaches the switching dosage is indicated, the display control computer closes the main infusion tube firstly, then opens the branch infusion tube corresponding to the liquid medicine bottle in the second sequence position, then closes the branch infusion tube corresponding to the liquid medicine bottle in the first sequence position, and finally opens the main infusion tube; and the rest can be analogized in turn to realize quantitative switching.

When the infusion mode is switched to empty:

all the liquid medicine bottles except the first sequence position (the liquid medicine bottle for the first transfusion) are closed through the flow control actuating mechanism (at the moment, only the main transfusion pipe and the branch transfusion pipe corresponding to the liquid medicine bottle in the first sequence position are in an open state); then the medical staff pricks the needle for the patient according to the traditional mode, the dropping speed is adjusted on the main infusion tube, and the dropping speed is confirmed on the display control computer; then, setting an infusion mode on a display control computer as medicine bottle empty switching, and pressing a start button; when the display control computer judges that no liquid medicine exists in the branch infusion tube according to the signal output by the capacitive liquid medicine sensor circuit on the branch infusion tube corresponding to the first-order liquid medicine bottle, the display control computer closes the main infusion tube firstly, then opens the branch infusion tube corresponding to the second-order liquid medicine bottle, then closes the branch infusion tube corresponding to the first-order liquid medicine bottle, and finally opens the main infusion tube; and the like in turn, so as to realize the timing switching.

In the infusion process, the photoelectric liquid medicine sensor circuit monitors the dropping speed of the dropping funnel in real time, and if the dropping speed is abnormal (namely exceeds a set range), the main infusion tube and all branch infusion tubes are closed; if the dropping speed is always in the set range, the main infusion tube and all branch infusion tubes are closed when the infusion is finished or no liquid medicine is in the infusion tube corresponding to the liquid medicine bottle in the last sequence, and the infusion is finished.

The infusion switching modes of the timing switching, the quantitative switching and the empty bottle switching can be used in a same infusion system in a mixed manner, and the control mode is the same as the control mode.

Example 2:

this embodiment provides a specific structure of the infusion monitoring control system according to embodiment 1 and its application to an infusion system having two liquid bottles.

Structurally, the infusion monitor control system comprises: the branch pipe measurement and control box is connected with the main electronic box through a cable to transmit signals; the liquid medicine detection subsystem, the measurement control subsystem and the flow control actuating mechanism are integrally installed in the branch pipe measurement and control box and the main electronic box.

As shown in fig. 2, the branch measurement and control box includes: the branch pipe measurement and control box upper box and the branch pipe measurement and control box lower box are provided with semicircular grooves as branch infusion pipe channels 28, and when the branch pipe measurement and control box upper box and the branch pipe measurement and control box lower box are oppositely buckled (one ends of the branch pipe measurement and control box upper box and the branch pipe measurement and control box lower box can be connected through hinges so as to be convenient to open and buckle), the two semicircular grooves are butted to form a channel for a branch infusion pipe to pass through; branch infusion tube limiting bosses 29 for limiting branch infusion tubes are arranged on two sides of an upper infusion tube channel 28 of the branch tube measurement and control box and a lower infusion tube channel 28 of the branch tube measurement and control box.

An electrode groove 27 and a pressure groove A15 are also processed on the upper box of the branch pipe measurement and control box, and the electrode groove 27 is used for installing an electrode CT2 for forming a capacitive liquid medicine sensor CT; the pressure groove A15 is a groove arranged on a branch liquid pipe channel 28 of the upper box of the branch liquid measurement and control box.

A liquid medicine detection subsystem circuit board 26 and a steering engine A13 are arranged in the lower branch measurement and control box (the steering engine A13 is arranged in the lower branch measurement and control box, and the steering engines A13 are respectively indicated in the upper branch measurement and control box and the lower branch measurement and control box in fig. 2 and are used for explaining two working states of switching off and switching on the branch infusion tube 16), and a liquid medicine detection circuit is integrated on the liquid medicine detection subsystem circuit board 26; and the electrode CT1 for forming the capacitance type liquid medicine sensor CT is positioned on the liquid medicine detection subsystem circuit board 26, when the upper box of the branch pipe measurement and control box is oppositely buckled with the lower box of the branch pipe measurement and control box, the electrode CT1 is opposite to the electrode CT2, and the capacitance type liquid medicine sensor CT is formed.

Because two electrodes for forming the capacitance type liquid medicine sensor CT are respectively arranged on the upper box and the lower box of the branch pipe measurement and control box, if wires are welded on the electrodes of the upper box and the lower box of the branch pipe measurement and control box, the production is inconvenient; therefore, in order to facilitate processing, the capacitance type liquid medicine sensor CT adopts a mode of connecting two capacitors in series, namely the electrode CT1 comprises an electrode CT1-1 and an electrode CT1-2, the electrode CT1-1 and the electrode CT1-2 are positioned on the same straight line, the capacitor formed by the electrode CT1-1 and the electrode CT2 is connected in series with the capacitor formed by the electrode CT1-2 and the electrode CT2, and the CT1-1, the CT1-2 and the CT2 form a series equivalent capacitor CT as shown in figure 3; therefore, the electrode CT1-1 and the electrode CT1-2 are integrated on the liquid medicine detection subsystem circuit board 26, no lead is required to be welded, and the process is simple.

When the branch infusion tube 16 is installed, the branch infusion tube 16 is pressed into a branch infusion tube channel 28 on the branch measurement and control along a branch infusion tube limit boss 29 on the branch measurement and control; then the upper box of the branch pipe measurement and control box is butted and buckled with the lower box of the branch pipe measurement and control box, and at the moment, the branch infusion tube 16 passes through the branch pipe measurement and control box. A pressure head A14 (cam structure) is mounted on an output shaft of the steering engine A13, the position of the pressure head A14 corresponds to the position of a pressure groove A15 on an upper box of the branch pipe measurement and control box, the pressure head A14 can be rotated under the driving of the steering engine A13 to press into the pressure groove A15, so that a branch infusion tube 16 is pressed and deformed to prevent the liquid medicine from flowing in the branch infusion tube, and after the pressure of the branch infusion tube 16 is relieved, the branch infusion tube 16 is restored, and the liquid medicine is restored to flow in the branch infusion tube 16.

The steering engine A13, the pressure head A14 and the pressure groove A15 form a branch pipe flow control actuating mechanism.

The branch transfusion tube 16 is positioned at the outer side of the pressure groove A15 during normal transfusion, and the pressure head A14 is not contacted with the branch transfusion tube 16; when the branch transfusion tube 16 needs to be closed, the steering engine A13 drives the pressure head A14 to move so as to press the branch transfusion tube 16 into the pressure groove A15, and the transfusion function of closing the branch transfusion tube 16 is realized. The control of the liquid medicine flow can be realized by adjusting the number of the branch transfusion tubes 16 pressed into the pressure groove A15 (by adjusting the rotation amount of the steering engine A13). The steering engine A13 is controlled by PWM, so that the system not only can realize the turn-off and turn-on of the transfusion of the branch transfusion tube 16, but also can realize the flow control of the transfusion.

As shown in fig. 4, the main electronic box 5 also has two parts, namely an upper main electronic box and a lower main electronic box, which are also integrally formed by butt-jointing and buckling. A dropping funnel positioning groove 8, a dropping funnel observation window 9, a main infusion tube channel 10, a main infusion tube limiting boss 11 and a photoelectric type liquid medicine sensor clamping groove 12 are respectively arranged at corresponding positions on the main electronic box upper box and the main electronic box lower box. Two opposite dropping funnel positioning grooves 8 are used for placing the dropping funnel on the main infusion tube 17, and two opposite dropping funnel observation windows 9 are respectively arranged at the positions corresponding to the two dropping funnel positioning grooves 8 and used for observing the dropping funnel from the outside; two opposing main infusion tube channels 10 form a channel for passing a main infusion tube 17; the main infusion tube limiting boss 11 is used for limiting the main infusion tube 17; the two opposite photoelectric liquid medicine sensor clamping grooves 12 are used for mounting a photoelectric liquid medicine sensor PES, a photoelectric liquid medicine sensor circuit is formed by the photoelectric liquid medicine sensor PES and a dripping speed detection circuit and serves as a dripping speed measuring device and is used for measuring the dripping speed of the liquid medicine in the dripping hopper, and the dripping speed detection circuit is integrated on the interface circuit board 6; the photoelectric liquid medicine sensor PES is arranged at a position slightly below the liquid dripping edge in the dripping hopper, so that the reliable operation can be ensured when the transfusion monitoring control system has a certain inclination angle.

A display control computer 5, an interface circuit board 6 and a power supply 7 of the measurement control subsystem are also arranged in the lower box of the main electronic box; wherein the power supply 7 is used for supplying power to the whole system (namely, the electronic equipment in the whole infusion monitoring control system), and the interface circuit board 6 is provided with an interface circuit.

Meanwhile, a steering engine B23 is arranged in the upper main electronic box, a pressure head B24 is arranged on an output shaft of the steering engine B23 (for convenience of description, the position of the steering engine B23 is indicated in the lower main electronic box in fig. 4), a groove is processed on a main infusion tube channel 10 of the lower main electronic box to serve as a pressure groove B25, the position of the pressure head B24 corresponds to the position of the pressure groove B25, and the pressure head B24 can be pressed into the pressure groove B25 under the driving of the steering engine B23. When the main infusion tube 17 is installed, the main infusion tube 17 is only required to be pressed into the main infusion tube channel 10 along the main infusion tube limiting boss 11; then the main electronic box upper box and the main electronic box lower box are butted and buckled, and the main infusion tube 17 passes through the main electronic box.

The steering engine B23, the pressure head B24 and the pressure groove B25 form a main infusion tube flow control actuating mechanism.

The main infusion tube 17 is arranged outside the pressure groove B25 during normal infusion, and the pressure head B24 is not contacted with the main infusion tube 17; when the main infusion tube 17 needs to be shut off, the steering engine B23 drives the pressure head B24 to move so as to press the main infusion tube 17 into the pressure groove B25, and the infusion function of shutting off the main infusion tube 17 is realized. The steering engine B23 is controlled by PWM, so that the system not only can realize the turn-off and the turn-on of the infusion of the main infusion tube 17, but also can realize the dropping speed control of the infusion.

When only one liquid medicine bottle is provided, the branch pipe measurement and control box is arranged above the dropping funnel of the infusion tube and used for detecting the existence of liquid medicine in the infusion tube, and the main electronic box is arranged on the dropping funnel and used for detecting the dropping speed and the dropping number of the liquid medicine drops in the dropping funnel.

The following description will be made in detail of the use of the infusion monitoring and control system in an infusion system having more than two liquid bottles, taking an infusion system having two liquid bottles as an example.

The infusion system with two liquid medicine bottles comprises two liquid medicine bottles (a liquid medicine bottle A1 and a liquid medicine bottle B2 respectively), and each liquid medicine bottle is communicated with a main infusion tube through a branch infusion tube.

The infusion monitoring and control system is used in an infusion system with two liquid medicine bottles as shown in fig. 5, and comprises: the branch pipe measurement and control boxes are two branch pipe measurement and control boxes (A3 and a B4 respectively) and a main electronic box, each liquid medicine bottle corresponds to one branch pipe measurement and control box, namely, a branch pipe measurement and control box A3 is connected to a branch infusion pipe corresponding to the liquid medicine bottle A1, and a branch pipe measurement and control box B4 is connected to a branch infusion pipe corresponding to the liquid medicine bottle B2; the branch pipe measurement and control box A3 and the branch pipe measurement and control box B4 are respectively connected with the main electronic box 5 through cables, and the main electronic box 5 is connected to the position of a dropping funnel on the main infusion tube.

Because the infusion system is provided with two branch infusion tubes and a main infusion tube, the flow control actuating mechanism specifically comprises two branch flow control actuating mechanisms and a main infusion tube flow control actuating mechanism, a liquid medicine detection subsystem and a branch flow control actuating mechanism are integrated in each branch measurement and control box, and a measurement control subsystem and a main infusion tube flow control actuating mechanism are integrated in the main electronic box 5.

The infusion monitoring control system can realize the infusion modes commonly used by medical care personnel, such as timing switching, quantitative switching, empty switching of medicine bottles and the like; the typical control process for an infusion system with two vials using the infusion monitor control system is:

for convenience of description, the branch infusion tube connected with the liquid medicine bottle A1 is a branch infusion tube A, and the branch infusion tube connected with the liquid medicine bottle B2 is a branch infusion tube B.

When the infusion flow is to deliver the liquid medicine in the liquid medicine bottle B2 within a set time and then switch to the liquid medicine in the liquid medicine bottle A1 (namely, switch at regular time):

firstly, a branch infusion tube A is closed by controlling a steering engine in a branch tube measurement and control box A3 on a liquid medicine bottle A1 (initially, pressure heads in the branch tube measurement and control box are all in positions which are not in contact with the branch infusion tube), then medical staff pricks the needle for a patient according to a traditional mode, the dropping speed is adjusted on a main infusion tube 17, and the dropping speed is confirmed on a display control computer; then setting a transfusion mode on a display control computer as timing switching, and determining the switching time length; pressing the start button to firstly transfuse the liquid medicine in the liquid medicine bottle B2; after the set switching time is reached, the display control computer firstly controls a steering engine in the main electronic box 5 to start and close the main infusion tube, then controls a steering engine in the branch tube measurement and control box A3 to start and reversely rotate, opens the branch infusion tube A, and then controls a steering engine in the branch tube measurement and control box B4 to start and close the branch infusion tube B; and finally, a steering engine in the main electronic box is controlled to start to open the main infusion tube and infuse the liquid medicine in the liquid medicine bottle A1.

In the process, the photoelectric liquid medicine sensor circuit monitors the dropping speed of the dropping funnel in real time, and if the dropping speed is abnormal (namely exceeds a set range), the main infusion tube 17 and the two branch infusion tubes are closed; if the dropping speed is always within the set range, the main infusion tube 17 and the branch infusion tube A are closed when the set infusion ending time is reached, and the infusion is finished.

When the infusion process is to first infuse a set amount of the liquid medicine in the liquid medicine bottle A1 and then infuse the liquid medicine in the liquid medicine bottle B2 (quantitative switching):

firstly, closing a branch infusion tube B by controlling a steering engine in a branch tube measurement and control box B4 on a liquid medicine bottle B2, then inserting a needle for a patient by medical staff according to a traditional mode, adjusting the dropping speed on a main infusion tube 17, and confirming the dropping speed on a display control computer; then, the infusion mode is set on the display control computer as quantitative switching, the volume of the liquid medicine is quantitatively switched (namely the switching dosage), and the liquid medicine in the liquid medicine bottle A1 is infused firstly by pressing a start button; after infusion starts, the display control computer records the number of drops of the liquid medicine in real time according to the output of the photoelectric liquid medicine sensor circuit, and when the number of drops of the liquid medicine reaches the set infusion switching drop number, the display control computer indicates that the infusion amount reaches the switching medicine amount; the display control computer controls a steering engine in the main electronic box 5 to start and close the main infusion tube, controls a steering engine in the branch tube measurement and control box B4 to start and rotate reversely, opens the branch infusion tube B, and controls a steering engine in the branch tube measurement and control box A3 to start and close the branch infusion tube A; and finally, a steering engine in the main electronic box is controlled to start to open the main infusion tube and infuse the liquid medicine in the liquid medicine bottle B2.

In the process, the dripping speed detection circuit monitors the dripping speed of the dripping hopper in real time, and if the dripping speed is abnormal (namely exceeds a set range), the main transfusion pipe 17 and the two branch transfusion pipes are closed; if the dropping speed is always within the set range, the main infusion tube 17 and the branch infusion tube B are closed when the set infusion ending time is reached, and the infusion is finished.

When the infusion process is that the liquid medicine in the liquid medicine bottle A1 is infused and then the liquid medicine in the liquid medicine bottle B2 is infused (empty switching of the liquid medicine bottle):

firstly, closing a branch infusion tube B by controlling a steering engine in a branch tube measurement and control box B4 on a liquid medicine bottle B2, then inserting a needle for a patient by medical staff according to a traditional mode, adjusting the dropping speed on a main infusion tube 17, and confirming the dropping speed on a display control computer; then, setting an infusion mode on a display control computer as medicine bottle empty switching, and pressing a start button; when the display control computer judges that no liquid medicine exists in the branch liquid conveying pipe A according to a detection signal of a capacitive liquid medicine sensor circuit in the branch pipe measurement and control box A, the display control computer firstly controls a steering engine in a main electronic box 5 to start and close a main liquid conveying pipe, then controls a steering engine in a branch pipe measurement and control box B4 to start and reversely rotate to open a branch liquid conveying pipe B, and then controls a steering engine in a branch pipe measurement and control box A3 to start and close the branch liquid conveying pipe A; and finally, a steering engine in the main electronic box is controlled to start to open the main infusion tube and infuse the liquid medicine in the liquid medicine bottle B2.

In the process, the dripping speed detection circuit monitors the dripping speed of the dripping hopper in real time, and if the dripping speed is abnormal (namely exceeds a set range), the main transfusion pipe 17 and the two branch transfusion pipes are closed; if the dropping speed is always in the set range, when the display control computer judges that the branch infusion tube B has no liquid medicine according to the detection signal of the capacitive liquid medicine sensor circuit in the branch tube measurement and control box B, the display control computer controls the main infusion tube 17 and the branch infusion tube B to be closed, and infusion is completed.

Example 3:

on the basis of the above embodiment 2, for convenient control, an APP for performing information interaction with a display control computer in a main electronic box can be set on a handheld terminal (such as a mobile phone), and the working parameter setting (setting the infusion mode, and directly turning on/off the main infusion tube and the branch infusion tube) of the infusion monitoring control system is performed through the APP, and the working state parameter of the infusion monitoring control system is received.

With the example of regularly switching, the process of controlling infusion system through handheld terminal's APP is:

firstly, closing a branch infusion tube A through the APP at the handheld terminal, then inserting the needle into the patient by medical staff according to the traditional mode, adjusting the dropping speed on the main infusion tube 17, and confirming the dropping speed on the APP at the handheld terminal; then, setting a transfusion mode as timing switching on an APP of the handheld terminal, and determining the switching duration; pressing the start button to firstly transfuse the liquid medicine in the liquid medicine bottle B2; after the set switching duration is reached, the APP of the handheld terminal sends a switching time-to-time prompt, the main infusion tube is closed, the branch infusion tube A is opened, and then the branch infusion tube B is closed; finally, the main infusion tube is opened to infuse the liquid medicine in the liquid medicine bottle A1.

In the process, if the dripping speed is abnormal, the APP of the handheld terminal gives an alarm prompt, and the medical staff closes the main infusion tube 17 and the two branch infusion tubes through the APP of the handheld terminal; if the dropping speed is always within the set range, the branch infusion tube A is up in infusion time, the APP of the handheld terminal controls the main infusion tube 17 and the branch infusion tube A to be closed, and an infusion completion prompt is sent; the above processes are recorded in real time in APP of the handheld terminal for future reference.

Example 4:

on the basis of the above embodiments 1-3, a specific circuit schematic diagram of the capacitive liquid medicine sensor circuit is further provided,

as shown in fig. 6, the principle of the capacitive liquid medicine sensor circuit includes: the device comprises a signal source circuit, an emitter follower circuit, a capacitance type liquid medicine sensor CT, an alternating current amplifying circuit, a rectifying circuit, a voltage conversion circuit and a direct current amplifying circuit.

Specifically, the method comprises the following steps: the signal source circuit includes: the circuit comprises an integrated operational amplifier (short for integrated operational amplifier) U1A, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a diode D1 and a diode D2, wherein the resistor R5 is an adjustable resistor; the signal source circuit generates a sinusoidal signal of a certain frequency, which is transmitted to the emitter follower circuit via the capacitor C3. The reverse input end of the operational amplifier U1A is provided with a grounding resistor R6, the in-phase input end of the operational amplifier U1A is provided with a grounding resistor R1, a capacitor C1 is connected with the resistor R1 in parallel, and the output end of the operational amplifier U1A is connected with the in-phase input end of the operational amplifier U1A through a lead which is connected with a capacitor C2 and a resistor R2 in series; meanwhile, the output end of the operational amplifier U1A is connected with the reverse input end of the operational amplifier U1A through a lead which is sequentially connected with a resistor R3, a resistor R4 and a resistor R5 in series, the diode D1, the diode D2 and the resistor R3 are connected in parallel, the cathode of the diode D2 is connected with the output end of the operational amplifier U1A, and the anode of the diode D1 is connected with the output end of the operational amplifier U1A. The output end of the operational amplifier U1A is the output end of the signal source unit circuit, the signal source unit circuit generates a sine signal with a certain frequency, the sine signal enters the emitter follower unit circuit through a circuit provided with a blocking capacitor C3 after being output, and a grounding resistor R7 is led out and connected between the output end of the operational amplifier U1A and the capacitor C3.

The emitter follower circuit comprises an integrated operational amplifier U1B, a resistor R8 and a resistor R9, is used for impedance conversion, and is convenient for matching a preceding circuit (a signal source unit circuit) with a subsequent circuit (a capacitance type liquid medicine sensor CT). The output end of the operational amplifier U1A is connected with the non-inverting input end of the operational amplifier U1B through a lead provided with a blocking capacitor C3, and the non-inverting input end of the operational amplifier U1B is provided with a grounding resistor R8; the inverting input end of the operational amplifier U1B is connected with the output end of the operational amplifier U1B, and the output end of the operational amplifier U1A is the output end of the emitter follower unit circuit; the signal output by the emitter follower circuit is transmitted to the capacitance type liquid medicine sensor CT.

The signal transmitted by the capacitance type liquid medicine sensor CT is amplified by an alternating current amplifying circuit, the alternating current amplifying circuit has two stages, and the first stage comprises an integrated operational amplifier U1C, a resistor R10, a resistor R11, a resistor R12, a resistor R13 and a capacitor C4; the second stage comprises an integrated operational amplifier U1D, a resistor R14, a resistor R15, a resistor R16, a resistor R17 and a capacitor C6; the signals between the two stages are coupled by a capacitor C5. The capacitor type liquid medicine sensor CT is connected with the in-phase input end of the integrated operational amplifier U1C through a lead, and the in-phase input end of the integrated operational amplifier U1C is provided with a grounding resistor R10; the reverse input end of the integrated operational amplifier U1C is grounded through a resistor R11 and a capacitor C4 in sequence; the output end of the integrated operational amplifier U1C is connected with the non-inverting input end of the integrated operational amplifier U1D through a lead provided with a capacitor C5; and meanwhile, the output end of the integrated operational amplifier U1C is provided with a grounding resistor R13, and a resistor R12 is arranged between the output end of the integrated operational amplifier U1C and the reverse input end of the integrated operational amplifier U1C. A grounding resistor R14 is connected between the capacitor C5 and the non-inverting input end of the integrated operational amplifier U1D; the reverse input end of the integrated operational amplifier U1D is grounded through the resistor R15 and the capacitor C6 in sequence; the reverse input end of the integrated operational amplifier U1D is connected with the output end of the integrated operational amplifier U1D through a wire provided with a resistor R16, and the output end of the integrated operational amplifier U1D is provided with a grounding resistor R17. The signal output by the output end of the integrated operational amplifier U1D is an output signal of the ac amplification circuit, and the signal Sdif (i.e., the output signal of the ac amplification circuit) amplified by the ac amplification circuit is output to the rectification circuit.

The rectification filter circuit receives an alternating current signal transmitted by the alternating current amplifying circuit and converts the received alternating current signal into a direct current signal, and the rectification circuit is a bridge rectification circuit and comprises a diode D3, a diode D4, a diode D5, a diode D6, a resistor R18 and a capacitor C7. The signal output by the rectifying circuit is a floating direct current signal, and the floating direct current signal is converted into a direct current signal taking GND as ground by the voltage conversion circuit. The diode D3, the diode D4, the diode D5 and the diode D6 form a bridge rectifier circuit. One end of an input port of the bridge rectifier circuit is connected with the signal Sdif, and the other end of the input port of the bridge rectifier circuit is grounded; meanwhile, the resistor R18 and the capacitor C7 are connected in parallel to form a filter and then are bridged at two ends of an output port of the bridge rectifier circuit. And the direct current voltage signal at the output end of the rectification filter circuit is output to the voltage conversion circuit.

The voltage conversion circuit is used for converting the direct-current voltage signal into a direct-current voltage signal taking a power ground GND as a ground, and comprises an integrated operational amplifier U2A, a resistor R19, a resistor R20, a resistor R21 and a resistor R22. The positive end of the output port of the rectifying circuit is connected with the inverting input end of the integrated operational amplifier U2A through a resistor R22, and the negative end of the output port of the rectifying circuit is connected with the non-inverting input end of the integrated operational amplifier U2A through a resistor R19. And the inverting input end of the integrated operational amplifier U2A is provided with a grounding resistor R20. The homodromous input end of the integrated operational amplifier U2A is connected with the output end of the integrated operational amplifier U2A through a resistor R21. The output end of the integrated operational amplifier U2A is the output end of the voltage conversion circuit, and outputs a dc voltage signal with the power ground GND as ground to the dc amplification circuit.

The dc amplifier circuit is used for amplifying a dc voltage signal with the power ground GND as the ground to form an output signal of the capacitive chemical liquid detection sensor circuit. The method comprises the following steps: the integrated operational amplifier U2B, a resistor R23, a resistor R24 and a resistor R25; the output end of the voltage conversion circuit is connected with the inverting input end of the integrated operational amplifier U2B through the resistor R25; the equidirectional input end of the integrated operational amplifier U2B is connected with the output end of the integrated operational amplifier U2B through a resistor R24, and meanwhile, the equidirectional input end of the integrated operational amplifier U2B is provided with a grounding resistor R23. The output end of the integrated operational amplifier U2B is the output end of the direct current amplifying circuit and outputs an output signal of the capacitive liquid medicine detection sensor circuit.

The output signal of the capacitance type liquid medicine detection sensor circuit is a direct current voltage signal, the size of the direct current voltage signal changes with the existence of liquid medicine flowing through the capacitance type liquid medicine sensor CT, when the capacity of the capacitance type liquid medicine sensor CT is small, the signal transmitted to the alternating current amplifying circuit by the capacitance type liquid medicine sensor CT is small, when the capacity of the capacitance type liquid medicine sensor CT is large, the signal transmitted to the alternating current amplifying circuit by the capacitance type liquid medicine sensor CT is large, namely the capacity of the capacitance type liquid medicine sensor CT is related to the existence of liquid medicine in the infusion tube, and therefore the size of the output signal of the capacitance type liquid medicine sensor circuit reflects the existence of liquid medicine in the infusion tube.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An infusion monitoring control system, comprising: the system comprises a liquid medicine detection subsystem, a measurement control subsystem and a flow control executing mechanism;

the liquid medicine detection subsystem comprises: a capacitive liquid medicine sensor circuit and a photoelectric liquid medicine sensor circuit; the circuit of the capacitive liquid medicine sensor is arranged on a liquid conveying pipe between a liquid conveying bottle and a dropping funnel on the liquid conveying pipe, the existence of liquid medicine in the liquid conveying pipe is monitored in real time through the capacitive liquid medicine sensor, and when no liquid medicine exists in the liquid conveying pipe, the capacitance capacity of the capacitive liquid medicine sensor is changed;

in the infusion process, the measurement control subsystem calculates the dropping speed of the medicine drops according to the pulse signals output by the photoelectric medicine liquid sensor, and performs averaging processing on the dropping speed of the medicine drops to obtain the average value of the dropping speed of the medicine drops; if the measurement control subsystem judges that the dropping speed of the medicine drops exceeds a set range according to the output signal of the photoelectric medicine liquid sensor circuit, a control instruction for shutting off the infusion pipeline is sent to the flow control executing mechanism, and the infusion pipeline is shut down after the flow control executing mechanism receives the control instruction;

in the infusion process, the measurement control subsystem digitizes the received output signal of the capacitive liquid medicine sensor circuit so as to obtain a digitized liquid medicine existence signal; when the measurement control subsystem judges that no liquid medicine exists in the liquid conveying pipe according to the output signal of the capacitive liquid medicine sensor circuit, a control instruction for shutting off the liquid conveying pipeline is sent to the flow control actuating mechanism, and the liquid conveying pipeline is shut off after the flow control actuating mechanism receives the control instruction;

when the monitored infusion system has more than two liquid bottles: the number of the capacitance type liquid medicine sensor circuits is the same as that of branch infusion tubes in the monitored infusion system, and the capacitance type liquid medicine sensor circuits are in one-to-one correspondence, and each capacitance type liquid medicine sensor circuit is arranged on the corresponding branch infusion tube to measure the existence of liquid medicine in the branch infusion tube; the photoelectric liquid medicine sensor circuit is arranged on a dropping funnel of the main infusion tube and is used for measuring the dropping speed and the dropping number of liquid medicine drops in the dropping funnel; the main infusion tube and each branch infusion tube are correspondingly provided with a flow control actuating mechanism which is used for controlling the opening or closing of the corresponding main infusion tube or branch infusion tube;

the infusion system with more than two liquid medicine bottles has infusion modes of timing switching, quantitative switching and empty switching of the liquid medicine bottles, if the infusion mode is quantitative switching:

after the dripping speed on the main infusion tube is adjusted, the switching medicine quantity is set in the measurement control subsystem, and the measurement control subsystem automatically calculates the switching dripping quantity according to the set switching medicine quantity and the known volume of single-drop liquid medicine; then the measurement control subsystem controls flow control actuating mechanisms on all branch infusion tubes except the branch infusion tube of the first infusion to close the corresponding branch infusion tube, and the liquid medicine in the liquid medicine bottle of the first infusion is infused; after infusion starts, the measurement control subsystem records the number of liquid medicine drops in real time according to an output signal of the photoelectric liquid medicine sensor circuit, when the number of the liquid medicine drops reaches a set switching drop number, the measurement control subsystem controls a flow control execution mechanism on a main infusion tube to close the main infusion tube, then controls a branch infusion tube of a second infusion tube to open, then controls a branch infusion tube of a first infusion tube to close, and finally controls the main infusion tube to open to deliver liquid medicine in a liquid medicine bottle of the second infusion tube; the quantitative switching is realized by analogy in sequence;

the infusion switching modes of timing switching, quantitative switching and empty medicine bottle switching can be mixed and used in the same infusion system;

the liquid medicine detection subsystem, the measurement control subsystem and the flow control actuating mechanism are integrally installed in the branch pipe measurement and control box and the main electronic box (5); the branch pipe measurement and control box is connected with the main electronic box (5) through a cable to transmit signals;

a branch pipe flow control actuating mechanism, a channel for a branch infusion tube (16) to pass through and a liquid medicine detection subsystem circuit board (26) are arranged in the branch pipe measurement and control box;

a drip chamber positioning groove (8), a drip chamber observation window (9), a channel for a main infusion tube (17) to pass through, a photoelectric liquid medicine sensor clamping groove (12), a main infusion tube flow control actuating mechanism, a display control computer, an interface circuit board (6) and a power supply (7) are arranged in the main electronic box (5);

the dropping funnel positioning groove (8) is used for placing a dropping funnel on the main infusion tube (17); the drip chamber observation window (9) is arranged at a position corresponding to the drip chamber positioning groove (8) and is used for observing the drip chamber from the outside; the photoelectric liquid medicine sensor clamping groove (12) is used for mounting a photoelectric liquid medicine sensor, and a circuit for enabling the photoelectric liquid medicine sensor to work is integrated on the interface circuit board (6); the photoelectric liquid medicine sensor is used for detecting the dropping speed and the dropping number of the liquid medicine drops in the dropping funnel;

the display control computer is used for receiving detection signals of the capacitance type liquid medicine sensor circuit and the photoelectric type liquid medicine sensor circuit and sending control instructions to the branch pipe flow control actuating mechanism and the main infusion pipe flow control actuating mechanism; meanwhile, the display and control computer is also used for inputting working parameters, displaying the parameters and storing information of the working process of the infusion system;

the branch pipe measurement and control box and the main electronic box both comprise an upper box and a lower box, and the upper box and the lower box are oppositely buckled to form a whole;

the capacitance type liquid medicine sensor includes: the electrode CT1 and the electrode CT2, wherein the electrode CT2 is installed in an electrode groove (27) of an upper box of a branch pipe measurement and control box, a liquid medicine detection circuit in the electrode CT1 and a capacitance type liquid medicine sensor circuit is integrated on a liquid medicine detection subsystem circuit board (26), the liquid medicine detection subsystem circuit board (26) is installed in a lower box of the branch pipe measurement and control box, and when the upper box of the branch pipe measurement and control box and the lower box of the branch pipe measurement and control box are oppositely buckled, the electrode CT1 and the electrode CT2 are opposite to each other to form a capacitance type liquid medicine sensor;

2. The infusion monitoring control system of claim 1, wherein when the infusion system being monitored has more than two bottles of drug liquid:

if the infusion mode is timing switching:

if the infusion mode is empty switching of the medicine bottle:

after the dripping speed on the main infusion tube is adjusted, the flow control executing mechanisms on all branch infusion tubes except the branch infusion tube for the first infusion are controlled by the measurement control subsystem to close the corresponding branch infusion tubes, and the liquid medicine in the liquid medicine bottle for the first infusion is infused; when the measurement control subsystem judges that no liquid medicine exists in the branch infusion tube according to a signal output by a capacitive liquid medicine sensor circuit on the branch infusion tube for the first infusion, the measurement control subsystem controls a flow control executing mechanism on a main infusion tube to close the main infusion tube, then controls a branch infusion tube for the second infusion to open, then controls a branch infusion tube for the first infusion to close, and finally controls the main infusion tube to open to deliver liquid medicine in a liquid medicine bottle for the second infusion; by analogy, empty switching of the medicine bottles is realized;

in the infusion process, the photoelectric liquid medicine sensor circuit monitors the dropping speed of the dropping funnel in real time, and if the measurement control subsystem judges that the dropping speed of the medicine is beyond a set range according to an output signal of the photoelectric liquid medicine sensor circuit, the main infusion tube and all branch infusion tubes are closed; if the dropping speed is always in the set range, the main infusion tube and all branch infusion tubes are closed when the infusion ending time is reached or no liquid medicine is in the infusion tube corresponding to the liquid medicine bottle for the last infusion, and the infusion is finished.

3. The fluid infusion monitoring control system of any one of claims 1-2, wherein said manifold flow control actuator comprises: a steering engine A (13), a pressure head A (14) and a pressure groove A (15); the capacitance type liquid medicine sensor circuit is arranged on the liquid medicine detection subsystem circuit board (26) and is used for monitoring whether liquid medicine exists in the infusion tube in real time;

the pressure groove A (15) is a groove arranged on a channel for the branch transfusion tube to pass through;

the pressure head A (14) is mounted on an output shaft of the steering engine A (13), the position of the pressure head A (14) corresponds to the position of the pressure groove A (15), and the pressure head A (14) can be driven by the steering engine A (13) to be rotationally pressed into the pressure groove A (15) to enable the branch infusion tube (16) to be pressed and deformed so as to shut off the branch infusion tube (16) or adjust the flow of liquid medicine in the branch infusion tube (16);

the main infusion tube flow control actuating mechanism comprises: a steering engine B (23), a pressure head B (24) and a pressure groove B (25); the pressure groove B (25) is a groove arranged on a channel for the main infusion tube (17) to pass through; the pressure head B (24) is installed on an output shaft of the steering engine B (23), the position of the pressure head B (24) corresponds to the position of the pressure groove B (25), the pressure head B (24) can be driven by the steering engine B (23) to rotate and press into the pressure groove B (25), so that the main infusion tube (17) is pressed and deformed to shut off the main infusion tube (17) or adjust the flow of the liquid medicine in the main infusion tube (17).

4. The infusion monitoring control system of claim 1, wherein when the infusion system being monitored has more than two bottles of drug liquid: a branch pipe measurement and control box is connected to the branch infusion pipe corresponding to each liquid medicine bottle, the main electronic box (5) is connected to the position of the dropping funnel on the main infusion pipe, and all the branch pipe measurement and control boxes are connected with the main electronic box (5) through cables respectively.

5. The infusion monitoring control system according to claim 1, wherein said medical fluid detection circuit comprises: the device comprises a signal source circuit, an emitter follower circuit, a capacitance type liquid medicine sensor, an alternating current amplification circuit, a rectification circuit, a voltage conversion circuit and a direct current amplification circuit;

the signal source circuit is used for generating a sinusoidal signal, and the generated sinusoidal signal is subjected to impedance conversion by the emitter follower circuit and then is transmitted to the alternating current amplifying circuit through the capacitive liquid medicine sensor; the signal amplified by the AC amplifying circuit is transmitted to a rectifying circuit; the rectifying circuit rectifies and filters the received signal to form a direct current signal output voltage conversion circuit; the voltage conversion circuit converts the received direct-current voltage signal into a direct-current voltage signal with the power ground as the ground and outputs the direct-current voltage signal to the direct-current amplification circuit; the DC amplifying circuit amplifies the received DC voltage signal with the power ground as the ground and outputs the amplified DC voltage signal as the output signal of the capacitive liquid medicine detection sensor circuit.

6. The infusion monitoring control system according to claim 1, wherein an APP for information interaction with a display control computer in a main electronic box is arranged on the handheld terminal, and the APP is used for setting the working parameters of the infusion monitoring control system, receiving the working state parameters of the infusion monitoring control system, directly turning on/off a main infusion tube and a branch infusion tube; the setting of the working parameters comprises setting of an infusion mode.