CN110711290B - Infusion liquid medicine detecting system - Google Patents
Infusion liquid medicine detecting system Download PDFInfo
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- CN110711290B CN110711290B CN201910962989.7A CN201910962989A CN110711290B CN 110711290 B CN110711290 B CN 110711290B CN 201910962989 A CN201910962989 A CN 201910962989A CN 110711290 B CN110711290 B CN 110711290B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
- A61M5/16831—Monitoring, detecting, signalling or eliminating infusion flow anomalies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3379—Masses, volumes, levels of fluids in reservoirs, flow rates
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Abstract
The invention discloses a transfusion liquid medicine detection system, comprising: the liquid medicine detection sensor is a bridge-type capacitance sensor, the liquid medicine detection sensor monitors the change of liquid medicine in the infusion tube in real time, and when the liquid medicine in the infusion tube changes, the capacitance capacity of the liquid medicine detection sensor changes accordingly. The liquid medicine detection circuit provides an excitation signal required by the liquid medicine detection sensor, amplifies and converts a detection signal of the liquid medicine detection sensor to form a direct current voltage signal which is used as an output signal of the liquid medicine detection circuit; the change curve of the output signal of the liquid medicine detection circuit in a set time interval reflects the process of the existence of the liquid medicine in the infusion tube, and the existence of the liquid medicine in the infusion tube is judged by monitoring the output signal of the liquid medicine detection circuit. The system detects the process from the existence of the infusion liquid medicine to the non-existence of the infusion liquid medicine, and has good environmental adaptability and strong anti-interference capability; and the liquid medicine detection sensor and the liquid medicine detection circuit are separately arranged, and can be conveniently matched with the existing transfusion system.
Description
Technical Field
The invention relates to a detection system, in particular to an infusion liquid medicine detection system, and belongs to the field of auxiliary medical care instruments.
Background
The capacitance used in the transfusion liquid medicine detection system based on capacitance capacity detection has smaller capacity, generally pF level, so that the small capacitance capacity is smaller when the liquid medicine in the transfusion tube is changed, the variation of the capacitance capacity is smaller, and great difficulty is brought to detection.
In order to solve the above problems, there are two detection methods:
the method comprises the following steps of (I) constructing an oscillating circuit, wherein the oscillating frequency of the oscillating circuit is related to the capacitance capacity, the capacitance capacity is changed due to the fact that the capacitance capacity is changed, and the oscillating frequency is changed due to the fact that the capacitance capacity is changed, so that the existence of liquid medicine in a liquid conveying pipe can be determined through detecting the oscillating frequency.
And (II) an oscillating circuit and a pulse width adjusting circuit are constructed, the oscillating circuit generates a pulse signal with a constant frequency, the signal is an input signal of the pulse width adjusting circuit, the pulse signal frequency is constant through the pulse width adjusting circuit, but the pulse width can change along with the change of the capacitance capacity of the circuit, so that the capacitance capacity is changed due to the change of the liquid medicine, the pulse width is changed due to the change of the capacitance capacity, and the purpose of detecting the existence of the liquid medicine can be achieved by detecting information such as the pulse width, the frequency spectrum of the signal and the like.
The two methods are based on the detection of the existence and non-existence of the liquid medicine in the infusion tube, and because the environment has influence on the capacitance, and the capacitance of the measured capacitor is smaller, the detection methods based on the states are easy to interfere, and have poor manufacturability in commercialization.
Disclosure of Invention
In view of this, the present invention provides a detection system for infusion solution, which is based on the detection of the presence or absence of the solution in the infusion tube, and has strong anti-interference capability.
The infusion liquid medicine detection system comprises: a liquid medicine detection sensor and a liquid medicine detection circuit;
the liquid medicine detection sensor monitors whether liquid medicine exists in the infusion tube in real time through the liquid medicine detection capacitor, and when no liquid medicine exists in the infusion tube, the capacitance capacity of the liquid medicine detection capacitor changes;
the liquid medicine detection circuit provides an excitation signal required by the liquid medicine detection sensor, amplifies and converts a detection signal of the liquid medicine detection sensor to form a direct current voltage signal which is used as an output signal of the liquid medicine detection circuit;
the change curve of the output signal of the liquid medicine detection circuit in a set time interval reflects the process of the existence of the liquid medicine in the infusion tube, and the existence of the liquid medicine in the infusion tube is judged by monitoring the output signal of the liquid medicine detection circuit.
In a preferred aspect of the present invention, the chemical liquid detection sensor includes: the liquid medicine detection device comprises a liquid medicine detection capacitor and a sensor circuit arranged on a sensor circuit board, wherein the sensor circuit board is arranged on a sensor clamp;
the closed end of the sensor clamp is a working end, and the other end of the sensor clamp is an operating end; semicircular grooves for placing sensor capacitor plates are respectively formed in two opposite surfaces of the working end of the liquid medicine detection device, the outer circumferential surfaces of a sensor capacitor plate A and a sensor capacitor plate B are consistent with the arc shape of the semicircular grooves, the shape of the inner circumferential surface of the sensor capacitor plate A is consistent with the shape of a liquid conveying pipe, and the sensor capacitor plate A and the sensor capacitor plate B are respectively installed in the two grooves to form a liquid medicine detection capacitor; when in use, the sensor clamp is clamped on the infusion tube, so that the infusion tube passes through the liquid medicine detection capacitor;
the sensor circuit includes: capacitor C4, capacitor C5, and capacitor C6; the capacitor C4, the capacitor C5, the capacitor C6 and the liquid medicine detection capacitor form a bridge structure, so that the liquid medicine detection capacitor is a bridge type capacitance sensor; SS and GND lead groups and REFs and SENS lead groups which are connected with the liquid medicine detection circuit are led out from the sensor circuit; the SS and GND lead groups are used as input ends of the bridge type capacitance sensor and comprise excitation signal lines and ground lines; the REFs and SENS conductor sets are used as output ends of the bridge type capacitance sensor and comprise a reference signal line and a sensor signal line.
In a preferred aspect of the present invention, the chemical liquid detection circuit includes: the circuit comprises a signal source unit circuit, an emitter follower unit circuit, a transformer, a differential amplification unit circuit, a bridge rectifier filter unit circuit, a voltage conversion unit circuit and a direct-current voltage amplification circuit; the signal source unit circuit is used for generating a sinusoidal signal, and the generated sinusoidal signal is subjected to impedance transformation through the emitter follower unit circuit and then is subjected to voltage boosting through the transformer to obtain an excitation signal; the excitation signal is transmitted to the bridge type capacitance sensor through the excitation signal line and is used as the input of the bridge type capacitance sensor; the output end of the bridge type capacitance sensor is used as the input of the differential amplification unit circuit, namely the sensor circuit is connected with the differential amplification unit circuit through the REFs and SENS conductor sets; the signal amplified by the differential amplification unit circuit is rectified and filtered by the bridge type rectification and filtering unit circuit to form a direct current signal Svdc; the direct current signal Svdc is converted into a direct current signal Svdcg taking GND as ground through the voltage conversion unit circuit; and after the Svdcg is amplified by the direct-current voltage amplifying circuit, a direct-current voltage signal Sout is formed, and the direct-current voltage signal Sout is an output signal of the liquid medicine detection circuit.
In a preferred embodiment of the present invention, the chemical detection sensor and the chemical detection circuit are provided separately; when the infusion tube is used, the liquid medicine detection sensor is arranged on the infusion tube and is connected with a liquid medicine detection circuit arranged in an external electronic box through a lead.
As a preferred mode of the present invention, when the infusion system to be monitored has more than two liquid medicine bottles/bags, each of which is connected to the main infusion tube through one branch infusion tube: each branch transfer line is provided with a liquid medicine detection sensor, a liquid medicine detection circuit is arranged in the external electronic box corresponding to each liquid medicine detection sensor, and the liquid medicine detection sensors are respectively connected with the corresponding liquid medicine detection circuits through leads.
Has the advantages that:
(1) the infusion liquid medicine detection system changes the traditional state detection mode, adopts the process detection from the existence to the non-existence of the liquid medicine, and has good environmental adaptability and strong anti-interference capability;
(2) the liquid medicine detection sensor and the liquid medicine detection circuit are separately arranged, the liquid medicine detection sensor is connected with the detection circuit through a lead, and the liquid medicine detection sensor is arranged on a transfusion tube when in use, so the liquid medicine detection device can be conveniently matched with the existing transfusion system, and can be conveniently applied to the transfusion detection of a two (or more) bottle (bag) transfusion system.
(3) The transfusion liquid medicine detection system is not in contact with liquid medicine when in use, is non-contact detection and has no influence on the original transfusion system;
(4) and the integrated bridge type capacitance sensor is adopted, so that the commercialization manufacturability is good.
Drawings
FIG. 1 is a schematic view of a liquid medicine detection sensor;
FIG. 2 is a schematic circuit diagram of a liquid medicine detection circuit;
fig. 3 is a schematic diagram of a two bottle (bag) infusion system detection system configuration.
Wherein: the sensor comprises a 1-sensor circuit board, a 2-sensor clamp, a 3-SS and GND lead group, a 4-REFs and SENS lead group, a 5-sensor capacitor plate lead group, a 6-sensor capacitor plate A and a 7-sensor capacitor plate B.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The embodiment provides a transfusion liquid medicine detecting system, adopts and detects from having to the process that does not have based on the liquid medicine, and environmental suitability is good, the interference killing feature is strong.
This infusion liquid medicine detecting system includes: a liquid medicine detection sensor and a liquid medicine detection circuit.
Wherein the liquid medicine detection sensor includes: the liquid medicine detection capacitor, the sensor circuit and the sensor clamp 2. Wherein the sensor circuit is arranged on a sensor circuit board 1, and the sensor circuit board 1 is mounted on a sensor clip 2.
Liquid medicine detection sensor as shown in fig. 1, sensor circuit board 1 draws forth three group's wires, is SS and GND wire group 3, REFs and SENS wire group 4 and sensor capacitance polar plate wire group 5 respectively, and wherein SS and GND wire group include: an excitation signal line (SS) and a ground line (GND), wherein the excitation signal line is a signal input end of the sensor circuit board 1; the REFs and SENs wire sets 4 include: reference signal lines (REFs) and sensor signal lines (SENs) which are signal output terminals of the sensor circuit board 1; the closed end of the sensor clamp 2 is a working end, the other end of the sensor clamp is an operating end, two opposite surfaces of the operating end are opened, and the two opposite surfaces of the working end are contacted; the opposite sides of the working end are separated by pinching the working end, and the sensor circuit board 1 is mounted on the working end of the sensor clip 2. The two opposite surfaces of the working end of the sensor clamp 2 are respectively provided with a groove for placing a sensor capacitor plate, the grooves are semicircular, and the two grooves form a circle after being butted. The sensor capacitor plate A6 and the sensor capacitor plate B7 are arc-shaped structures which are made of thin copper materials and are consistent with the arc shape of the grooves, the shape of the inner circumferential surface of the arc-shaped structures is consistent with the shape of an infusion tube, and the sensor capacitor plate A6 and the sensor capacitor plate B7 are respectively arranged in the two grooves to form a liquid medicine detection capacitor CT. When the infusion tube is used, the infusion tube penetrates through the middle of the liquid medicine detection capacitor CT, and the size of the liquid medicine detection capacitor CT ensures that the infusion tube can be clamped without influencing infusion. Two leads led out from the sensor capacitor plate lead group 5 are respectively connected with the sensor capacitor plate A6 and the sensor capacitor plate B7, and the sensor capacitor plate lead group 5 is used for connecting the liquid medicine detection capacitor CT to a sensor circuit arranged on the sensor circuit board 1.
The sensor circuit includes: the three capacitors are respectively a capacitor C4, a capacitor C5 and a capacitor C6, the three capacitors are arranged on a sensor circuit board, and a liquid medicine capacitor CT formed by the three capacitors and two sensor capacitor plates forms a bridge circuit structure, so that the bridge type capacitance sensor is formed. The method specifically comprises the following steps: the capacitor C4 and the capacitor C5 are connected in series and then connected in parallel with a circuit formed by connecting the capacitor C6 and the chemical liquid capacitor CT in series, the excitation signal sdi is connected to one end of the formed parallel circuit through an excitation signal line SS and the GND wire group 3, and the other end of the formed parallel circuit is grounded to the ground line SS and the GND wire group 3. Reference signal lines (REFs) are led out between the capacitor C4 and the capacitor C5, and sensor signal lines (SENS) are led out between the capacitor C6 and the chemical liquid detection capacitor CT, so that a REFs and SENS lead wire group 4 is formed. Wherein, the reference signal lines (REFs) are connected with the differential amplification unit circuit in the liquid medicine detection circuit through the lead wire provided with the capacitor C7, and the sensor signal lines (SENS) are connected with the differential amplification unit circuit in the liquid medicine detection circuit through the lead wire provided with the capacitor C8.
As shown in fig. 2, the principle of the chemical liquid detection circuit includes: the circuit comprises a signal source unit circuit, an emitter follower unit circuit, a transformer, a differential amplification unit circuit, a bridge rectifier filter unit circuit, a voltage conversion unit circuit and a direct-current voltage amplification circuit. Sinusoidal signals generated by the signal source unit circuit are added to the primary side of the transformer after being subjected to impedance conversion by the emitter follower unit circuit; after the voltage is boosted by the transformer, an excitation signal with higher voltage is obtained on the secondary side of the transformer; the excitation signal is added to the input end SS of the liquid medicine detection sensor, and the excitation signal with higher voltage is beneficial to improving the sensitivity of the liquid medicine sensor; the voltage difference between two ends of the liquid medicine detection sensors REFs and SENS is an input signal of a differential amplification unit circuit, and a signal Sdif amplified by the differential amplification unit circuit is rectified and filtered by a bridge rectifier filter unit circuit to become a direct current signal Svdc; the ground of the Svdc is a suspended ground, and is converted into a direct current signal Svdcg with GND as the ground through the voltage conversion unit circuit; after being amplified by the direct-current voltage amplifying circuit, the Svdcg becomes a direct-current voltage signal Sout convenient for subsequent processing.
Specifically, the method comprises the following steps: wherein the signal source unit circuit includes: operational amplifier (LM 324 is used in the scheme) U1A, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, capacitor C1, capacitor C2, diode D1 and diode D2. The inverting input end of the operational amplifier U1A is grounded through a lead provided with a resistor R6, the non-inverting input end of the operational amplifier U1A is grounded through a lead provided with a resistor R2, a capacitor C2 is connected with a resistor R2 in parallel, and the output end of the operational amplifier U1A is connected with the non-inverting input end of the operational amplifier U1A through a lead which is connected with a capacitor C1 and a resistor R1 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, and a diode D1, a diode D2 and a resistor R3 are connected in parallel, wherein the cathode of the diode D1 is connected with the output end of the operational amplifier U1A, and the anode of the diode D2 is connected with the output end of the operational amplifier U1A. The resistor R5 is a resistance-variable resistor. 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, and the sine signal enters the emitter follower unit circuit through the circuit provided with the blocking capacitor C3 after being output.
The emitter follower unit circuit is used for impedance transformation, so that a preceding stage circuit (a signal source unit circuit) of the emitter follower unit circuit is matched with a subsequent stage circuit (a liquid medicine detection sensor capacitance bridge) of the emitter follower unit circuit; the emitter follower unit circuit includes: the operational amplifier U1B and the resistor R7, wherein 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 of the operational amplifier U1B is grounded through a lead provided with a resistor R7; the inverting input of operational amplifier U1B is connected to the output of operational amplifier U1B. 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 unit circuit is boosted by the transformer T1 to become the excitation signal sdi, and the excitation signal sdi is connected with the capacitance bridge of the liquid medicine detection sensor through the excitation signal wire SS in the SS and GND wire set 3.
The differential amplification unit circuit includes: the circuit comprises an operational amplifier U1C, an operational amplifier U1D, an operational amplifier U2A, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C9 and a capacitor C10. The REFs and the reference signal lines (REFs) in the SENS lead group 4 led out from the sensor circuit board 1 are connected with the non-inverting input end of an operational amplifier U1C through a lead provided with a capacitor C7, and the non-inverting input end of the operational amplifier U1C is grounded through a lead provided with a resistor R8; the sensor signal line (SENs) in the REFs and SENs conductor set 4 is connected to the non-inverting input of the operational amplifier U1D via a conductor provided with a capacitor C8, while the non-inverting input of the operational amplifier U1D is connected to ground via a conductor provided with a resistor R9. The inverting input terminal of the operational amplifier U1C is connected to the inverting input terminal of the operational amplifier U1D through a wire provided with a resistor R10, the inverting input terminal of the operational amplifier U1C is connected to the output terminal of the operational amplifier U1C, and the inverting input terminal of the operational amplifier U1D is connected to the output terminal of the operational amplifier U1D. Meanwhile, the output end of the operational amplifier U1C is connected with the inverting input end of the operational amplifier U2A through a lead wire sequentially provided with a capacitor C9 and a resistor R11, and the output end of the operational amplifier U1D is connected with the non-inverting input end of the operational amplifier U2A through a lead wire sequentially provided with a capacitor C10 and a resistor R12. The inverting input of the operational amplifier U2A is also connected to the output of the operational amplifier U2A by a conductor provided with a resistor R13, and the non-inverting input of the operational amplifier U2A is also connected to ground by a conductor provided with a resistor R14. The signal output by the output terminal of the operational amplifier U2A is the output signal of the differential amplification unit circuit, and the signal Sdif (i.e. the output signal of the differential amplification unit circuit) amplified by the differential amplification circuit is output to the bridge rectifier filter unit circuit.
The bridge rectifier filter unit circuit is used for carrying out rectifier filtering on the signal Sdif to form a direct current voltage signal Svdc, and the direct current voltage signal Svdc is a floating ground voltage signal. The bridge rectifier filter unit circuit comprises a diode D3, a diode D4, a diode D5, a diode D6, a resistor R15 and a capacitor C11. The diode D3 and the diode D4 are connected in series and then connected in parallel with a circuit formed by the diode D5 and the diode D6 in series, wherein the anode of the diode D3 is connected with the anode of the diode D4, and the cathode of the diode D5 is connected with the cathode of the diode D6. One end of the formed parallel circuit is connected with the signal Sdif, and the other end of the formed parallel circuit is grounded; meanwhile, after the resistor R15 and the capacitor C11 are connected in parallel, one end of the resistor R15 is connected between the diode D3 and the diode D4, and the other end of the resistor R15 is connected between the diode D5 and the diode D6. The lead wire led out between the diode D5 and the diode D6 is the output end Svdc of the bridge rectifier filter unit circuit, and outputs the direct current voltage signal Svdc to the voltage transformation unit circuit.
The voltage conversion unit circuit is used for converting the direct current voltage signal Svdc into a direct current voltage signal Svdcg with the power ground GND as the ground. The voltage conversion unit circuit includes: the transport amplifier U2B, resistance R16, resistance R17, resistance R18 and resistance R19. The output end of the bridge rectifier filter unit circuit is connected with the non-inverting input end of the transport amplifier U2B through a lead provided with a resistor, and the non-inverting input end of the transport amplifier U2B is grounded through a lead provided with a resistor R18. The inverting input of the transport amplifier U2B is connected between the diode D3 and the diode D4 by a wire provided with a resistor R17, while the inverting input of the transport amplifier U2B is connected to the output of the transport amplifier U2B by a wire provided with a resistor R19. The output terminal of the transport amplifier U2B is the output terminal of the voltage conversion unit circuit, and outputs the dc voltage signal Svdcg with the power ground GND as the ground to the dc voltage amplification circuit.
The dc voltage amplifying circuit is used for amplifying a dc voltage signal Svdcg with the power ground GND as the ground to form a chemical liquid detection circuit output signal Sout. The DC voltage amplifying circuit includes: the transport amplifier U2C, resistance R20, resistance R21, resistance R22 and resistance R23. The output end of the voltage conversion unit circuit is connected with the non-inverting input end of the transport amplifier U2C through a lead provided with a resistor R20, and the non-inverting input end of the transport amplifier U2C is grounded through a lead provided with a resistor R21; the inverting input of the transport amplifier U2C is connected to the output of the transport amplifier U2B by a conductor provided with a resistor R22, while the inverting input of the transport amplifier U2C is connected to ground by a conductor provided with a resistor R23. The output end of the transport amplifier U2C is the output end of the voltage conversion unit circuit, and outputs the output signal Sout of the liquid medicine detection circuit.
The output signal Sout of the liquid medicine detection circuit is a direct current voltage signal, and the magnitude of the direct current voltage signal changes with the existence of the liquid medicine flowing through the liquid medicine detection capacitor CT. The liquid medicine detection capacitor CT has a certain length along the axial direction of the infusion tube, so that a certain time is required when an interface with or without liquid medicine passes through the liquid medicine detection capacitor CT, the characteristic is reflected to the output signal Sout of the liquid medicine detection circuit, the output signal Sout of the liquid medicine detection circuit is a variable from small to large, and whether the infusion process is finished or not can be judged by detecting a voltage rising curve of the output signal Sout of the liquid medicine detection circuit at a certain time interval. The method specifically comprises the following steps: when the liquid medicine is in the infusion tube, the voltage of the signal Sout is lower; when the liquid medicine passes through the liquid medicine detection capacitor CT from the existence to the nonexistence, the voltage of Sout will be increased; when the liquid medicine completely passes through the liquid medicine detection capacitor CT, namely when no liquid medicine exists in the liquid medicine detection capacitor CT, the voltage of Sout reaches the highest value. The change of the liquid medicine in the transfusion tube is determined by detecting the process.
The system determines that no liquid medicine exists in the infusion tube by detecting the process from the existence of the liquid medicine, and is different from a state detection method, wherein the state detection method is used for detecting the existence of the liquid medicine in the infusion tube according to the existence of the liquid medicine in the infusion tube, and the state detection method does not reflect the infusion process, so the state detection method has poor interference resistance. Therefore, the infusion liquid medicine detection system has good environmental adaptability and strong anti-interference capability.
The liquid medicine detection sensor (namely, the integrated bridge type capacitance sensor) is arranged separately from the liquid medicine detection circuit, and the liquid medicine detection sensor is connected with the liquid medicine detection circuit arranged in the external electronic box through a lead, so that the transfusion liquid medicine detection system can be conveniently matched with the existing transfusion system, and can be conveniently applied to the transfusion detection of the transfusion system with more than two transfusion bottles (bags). An infusion system with two infusion bottles (bags) is shown in fig. 3, and comprises two liquid medicine bottles (bags), wherein each liquid medicine bottle (bag) is connected to a main infusion tube through a branch infusion tube. The two liquid medicine detection sensors are respectively clamped on the branch infusion tubes of the two liquid medicine bottles (bags) through the sensor clamps 2 and are used for monitoring whether liquid medicine exists in the branch infusion tubes in real time; a liquid medicine detection circuit is arranged in the external electronic box corresponding to each liquid medicine detection sensor, and the two liquid medicine detection sensors are respectively connected with the corresponding liquid medicine detection circuits through leads.
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 (5)
1. An infusion solution detection system, comprising: a liquid medicine detection sensor and a liquid medicine detection circuit;
the liquid medicine detection sensor monitors whether liquid medicine exists in the infusion tube in real time through the liquid medicine detection capacitor, and when no liquid medicine exists in the infusion tube, the capacitance capacity of the liquid medicine detection capacitor changes;
the liquid medicine detection circuit provides an excitation signal required by the liquid medicine detection sensor, amplifies and converts a detection signal of the liquid medicine detection sensor to form a direct current voltage signal which is used as an output signal of the liquid medicine detection circuit;
the change curve of the output signal of the liquid medicine detection circuit in a set time interval reflects the process of the existence of the liquid medicine in the infusion tube, and the existence of the liquid medicine in the infusion tube is judged by monitoring the output signal of the liquid medicine detection circuit;
the output signal of the liquid medicine detection circuit is a direct-current voltage signal, and the magnitude of the direct-current voltage signal changes with the existence of liquid medicine flowing through the liquid medicine detection capacitor; the liquid medicine detection capacitor has a set length along the axial direction of the infusion tube, so that a certain time is needed when the interface of the liquid medicine passes through the liquid medicine detection capacitor, and the output signal of the liquid medicine detection circuit is a variable from small to large when the interface of the liquid medicine passes through the liquid medicine detection capacitor: when liquid medicine exists in the infusion tube, the voltage of the output signal of the liquid medicine detection circuit is lower; when the liquid medicine passes through the liquid medicine detection capacitor from the existence to the nonexistence, the voltage of the output signal of the liquid medicine detection circuit is increased along with the liquid medicine; when the liquid medicine completely passes through the liquid medicine detection capacitor, namely when no liquid medicine exists in the liquid medicine detection capacitor, the voltage of an output signal of the liquid medicine detection circuit reaches the highest voltage; therefore, the change of the liquid medicine in the infusion tube is determined by detecting the voltage rising curve of the output signal of the liquid medicine detection circuit at a certain time interval.
2. The infusion solution detection system according to claim 1, wherein the solution detection sensor comprises: the liquid medicine detection device comprises a liquid medicine detection capacitor and a sensor circuit arranged on a sensor circuit board, wherein the sensor circuit board is arranged on a sensor clamp;
the closed end of the sensor clamp is a working end, and the other end of the sensor clamp is an operating end; semicircular grooves for placing sensor capacitor plates are respectively formed in two opposite surfaces of the working end of the liquid medicine detection device, the outer circumferential surfaces of a sensor capacitor plate A and a sensor capacitor plate B are consistent with the arc shape of the semicircular grooves, the shape of the inner circumferential surface of the sensor capacitor plate A is consistent with the shape of a liquid conveying pipe, and the sensor capacitor plate A and the sensor capacitor plate B are respectively installed in the two grooves to form a liquid medicine detection capacitor; when in use, the sensor clamp is clamped on the infusion tube, so that the infusion tube passes through the liquid medicine detection capacitor;
the sensor circuit includes: capacitor C4, capacitor C5, and capacitor C6; the capacitor C4, the capacitor C5, the capacitor C6 and the liquid medicine detection capacitor form a bridge circuit structure, so that the liquid medicine detection capacitor is a bridge type capacitance sensor; SS and GND lead groups and REFs and SENS lead groups which are connected with the liquid medicine detection circuit are led out from the sensor circuit; the SS and GND lead groups are used as input ends of the bridge type capacitance sensor and comprise excitation signal lines and ground lines; the REFs and SENS conductor sets are used as output ends of the bridge type capacitance sensor and comprise a reference signal line and a sensor signal line.
3. The infusion solution detection system according to claim 2, wherein the solution detection circuit comprises: the circuit comprises a signal source unit circuit, an emitter follower unit circuit, a transformer, a differential amplification unit circuit, a bridge rectifier filter unit circuit, a voltage conversion unit circuit and a direct-current voltage amplification circuit; the signal source unit circuit is used for generating a sinusoidal signal, and the generated sinusoidal signal is subjected to impedance transformation through the emitter follower unit circuit and then is subjected to voltage boosting through the transformer to obtain an excitation signal; the excitation signal is transmitted to the bridge type capacitance sensor through the excitation signal line and is used as the input of the bridge type capacitance sensor; the output end of the bridge type capacitance sensor is used as the input of the differential amplification unit circuit, namely the sensor circuit is connected with the differential amplification unit circuit through the REFs and SENS conductor sets; the signal amplified by the differential amplification unit circuit is rectified and filtered by the bridge type rectification and filtering unit circuit to form a direct current signal Svdc; the direct current signal Svdc is converted into a direct current signal Svdcg taking GND as ground through the voltage conversion unit circuit; and after the Svdcg is amplified by the direct-current voltage amplifying circuit, a direct-current voltage signal Sout is formed, and the direct-current voltage signal Sout is an output signal of the liquid medicine detection circuit.
4. The infusion solution detection system according to claim 1, 2 or 3, wherein said solution detection sensor and solution detection circuit are provided separately; when the infusion tube is used, the liquid medicine detection sensor is arranged on the infusion tube and is connected with a liquid medicine detection circuit arranged in an external electronic box through a lead.
5. The infusate detection system as claimed in claim 4, wherein when the infusion system to be monitored has more than two bottles/bags of liquid drugs, each bottle/bag of liquid drugs being connected to the main infusion line through one sub-infusion line: each branch transfer line is provided with a liquid medicine detection sensor, a liquid medicine detection circuit is arranged in the external electronic box corresponding to each liquid medicine detection sensor, and the liquid medicine detection sensors are respectively connected with the corresponding liquid medicine detection circuits through leads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910962989.7A CN110711290B (en) | 2019-10-11 | 2019-10-11 | Infusion liquid medicine detecting system |
Applications Claiming Priority (1)
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| CN111632227B (en) * | 2020-04-23 | 2022-12-06 | 罗云汉 | Infusion monitoring control system and device |
| CN115105688A (en) * | 2022-05-24 | 2022-09-27 | 湖南芯易德科技有限公司 | Atomization device |
| CN115356381A (en) * | 2022-08-15 | 2022-11-18 | 四川省慈予医疗科技有限责任公司 | Double-capacitor acquisition method for infusion tube based on variable electric field effect |
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