CN106512144A - Intravenous infusion monitoring sensor based on radio frequency method - Google Patents
Intravenous infusion monitoring sensor based on radio frequency method Download PDFInfo
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- CN106512144A CN106512144A CN201611013329.7A CN201611013329A CN106512144A CN 106512144 A CN106512144 A CN 106512144A CN 201611013329 A CN201611013329 A CN 201611013329A CN 106512144 A CN106512144 A CN 106512144A
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- Prior art keywords
- transfusion
- circuit
- tube
- liquid
- radio frequency
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Classifications
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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
- A61M5/1684—Monitoring, detecting, signalling or eliminating infusion flow anomalies by detecting the amount of infusate remaining, e.g. signalling end of infusion
-
- 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
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- Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention provides an intravenous infusion monitoring sensor based on a radio frequency method. The intravenous infusion monitoring sensor comprises an oscillator, a filter circuit and a detector circuit, wherein the oscillator is a three-point capacitance oscillator; any one capacitor in the three-point capacitance oscillator serves as a liquid state detector; and the capacitor, which serves as the liquid state detector, is a parallel plate capacitor, so that an infusion tube is clamped between two electrodes of the parallel plate capacitor; the oscillator can generate a signal at some preset frequency; the signal is filtered by virtue of the filter circuit and then is detected by virtue of the detector circuit; and a medicine liquid state in the infusion tube is reflected by the change in a voltage value outputted from the detector circuit. The intravenous infusion monitoring sensor provided by the invention can significantly improve the detecting accuracy, and the sensor is not easily affected by environmental factors; the intravenous infusion monitoring sensor is low in cost, long in service life, high in sensitivity and convenient to use; and the intravenous infusion monitoring sensor, which adopts non-contact measurement in a detecting process, is free from pollution to medicine liquid.
Description
Technical field
The present invention relates to a kind of venous transfusion monitors sensor.
Background technology
Venous transfusion is that one kind makes to drip under liquid using fluid pressure principle, and Jing veins are input into a large amount of sterile solutions or medicine
Therapeutic Method, it as rescuing and can treat one of important means of disease in clinical application.Cure in developed country at present
Institute's transfusion ratio is about 45%, and in China, hospital transfusion ratio is higher, and some hospitals are up to 90%.During hospital's venous transfusion, need
Monitor in real time is carried out to transfusion progress, if liquid is totally lost and is not found in time in infusion bottle, as tube for transfusion is connected to sky
Infusion bottle, when horse Fei Shi drop liquid in pipe is totally lost, air will be likely to result in patient's blood back, blood coagulation etc. abnormal into tube for transfusion
Situation, brings inconvenience to transfusion is continued, or even malpractice occurs.Manual monitoring is adopted at present generally, according to the preliminary statistics, this is extremely
More than the 75% of nurse's routine work amount is occupied less.
With electronic technology, computer technology, network and information technology fast development, accelerate clinical medical
Exhibition, it is desirable to which hospital realizes information-based, automatization and intelligent construction.Information-based, intelligence is realized in intelligent medical monitoring infusion field
Energyization, it has also become the certainty of development in science and technology.The high development of modern science and technology provides solid for intelligent medical monitoring infusion technology
Technical foundation.Current situation is that the development of medical monitoring equipment and technology can not still meet patient, family, hospital in the world
With the demand of the aspect such as society.From the point of view of the present situation of China, hospital's quantity that China possesses is most in the world, is disappeared
Take that colony is very huge, due to the support of government, China's Medical Equipment Development is rapid these years, but the market share is less than generation
The 5% of boundary's armarium, State Economic and Trade Commission require that this market share will reach 25% to the year two thousand fifty, become World Medical apparatus
Manufacturing power.In view of this intelligent medical transfusion monitoring system has boundless development space and good market prospect.
With electronic technology, computer technology, network and information technology fast development, accelerate clinical medical development, it is desirable to cure
Institute realizes information-based, automatization and intelligent construction.Realize in intelligent medical monitoring infusion field it is information-based, intelligent, into
For the certainty of development in science and technology.
The content of the invention
In order to overcome the deficiencies in the prior art, the present invention to provide a kind of venous transfusion detection sensor based on radio frequency method,
With low cost, life-span length, small volume, sensitivity are high, easy to use, pollution-free and are difficult to be affected using pharmacy type by institute
Advantage.
The technical solution adopted for the present invention to solve the technical problems is：Including agitator, filter circuit and detecting circuit,
Described agitator adopts capacitance connecting three point type oscillator, using any one electric capacity in capacitance connecting three point type oscillator as liquid
State detector, adopts parallel plate capacitor as the electric capacity of liquid condition detector, make infusion tube clamp parallel plate capacitor the two poles of the earth it
Between；Described agitator produces a certain setpoint frequency signal, after the filtered circuit filtering of the signal, then tested wave circuit detection,
Medicinal liquid state in the voltage value changes reflection tube for transfusion of detecting circuit output.
The filter circuit is fallen in filter circuit using passive high-pass filtering electricity, resonant frequency during tube for transfusion no liquid
In passband, tube for transfusion has resonant frequency during liquid to fall in the stopband of filter circuit.
The detecting circuit adopts diode envelope detecting circuit.
Described liquid condition detector is arranged on the transfusion tube wall between infusion bottle and drop kettle.
The invention has the beneficial effects as follows：Using radio circuit capacitance three-point type resonance principle, when there is liquid in tube for transfusion,
Stopband of the sensor resonant frequency in filter circuit, Jing after detecting circuit, output voltage is close to zero, and works as tube for transfusion aneroid
During body, passband of the sensor resonant frequency in filter circuit, Jing after detecting circuit, is output as fixing DC voltage value.Therefore,
Can be realized to venous transfusion real-time monitoring by the real-time detection to detecting circuit output voltage values.Designed biography of the invention
Sensor is converted into detecting circuit output electricity compared with traditional venous transfusion detection sensor, by transfusion liquid in pipe whether there is information
Pressure value, makes detection more easy, and accuracy in detection is significantly improved, and sensor is not easily affected by environmental factors, low cost,
Life-span length, sensitivity are high, easy to use, and detection process is non-cpntact measurement, will not produce pollution to medicinal liquid.
Description of the drawings
Fig. 1 is inventive sensor scheme of installation
Fig. 2 is capacitance connecting three point type oscillator schematic diagram of the present invention
Fig. 3 is three ranks high pass filter schematic diagram of the invention
Fig. 4 is cymoscope schematic diagram of the present invention
In figure, CCIt is capacitance, L is inductance, C is electric capacity, R is resistance, C1It is detection electric capacity, R is resistance.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples, and the present invention includes but are not limited to following enforcements
Example.
Venous transfusion monitoring sensor of the present invention is made up of three parts：Agitator, filter circuit and detecting circuit,
Agitator produces a certain frequency signal, and signal frequency is affected (when having medicinal liquid by medicinal liquid dielectric constant in the middle of parallel plate capacitor
It is medicinal liquid in tube for transfusion, more than 40, without being air in tube for transfusion when medicinal liquid, dielectric constant is 1 to dielectric constant, due to dielectric
The change of constant, parallel plate capacitor value change, so as to cause oscillator output frequencies to change), the filtered circuit of the signal
After being filtered, then detection is carried out by detecting circuit, output voltage values can react the presence or absence of tube for transfusion inner liquid medicine after detection,
That is the output of agitator connects the input of filter circuit, and the output of filter circuit connects the output of detecting circuit, the output of detecting circuit
Reaction medicinal liquid state.
The agitator adopts capacitance connecting three point type oscillator, with any one the electric capacity conduct in capacitance connecting three point type oscillator
Liquid condition detector, adopts parallel plate capacitor as the electric capacity of liquid condition detector, makes infusion tube clamp in parallel plate capacitor
Between the two poles of the earth.
The filter circuit designs the parameter of high pass filter, when making tube for transfusion no liquid using passive high-pass filtering electricity
Resonant frequency fall in the passband of high pass filter, when having liquid, resonant frequency reduces and falls in filter stop bend.
The detecting circuit adopts diode envelope detecting circuit, is mutually concatenated with RC low pass filters by diode and constitutes electricity
Road.
Embodiments of the invention are arranged on transfusion tube wall, are positioned between infusion bottle and drop kettle, using 3 points of electric capacity
An electric capacity in formula agitator can transmit monitoring state by wireless device in real time as liquid state monitor, and installation is shown
Be intended to as shown in figure 1, tube for transfusion is sandwiched between the two poles of the earth of parallel plate capacitor, when infuse liquid in pipe from have to it is unchanged when,
The relative dielectric constant of monitored area also changes, i.e., conventional medicinal liquid relative dielectric constant is more than 40, and air is relative
Dielectric constant is 1, so that changing as the capacitance of liquid state monitor, ultimately results in capacitance three-point type resonance electricity
The resonant frequency on road shifts, and (skew is greater than noise, or perhaps error.This noise includes circuit self-noise and outer
Carry out influence of noise.Skew under the conditions of this is met, but skew is bigger, certainty of measurement is higher, chooses appropriate),
Resonant frequency during no liquid just falls in the passband of filter circuit, is exportable obvious d. c. voltage signal Jing after detection, and
There is resonant frequency during liquid to fall in the stopband of filter circuit, output voltage is close to zero Jing after detection.
Embodiments of the invention include agitator, filter circuit and detecting circuit.
The agitator adopts capacitance connecting three point type oscillator, is also Colpitts oscillator, is one kind of self-excited oscillator.This
The advantage for planting circuit is good output waveform, and frequency of oscillation is up to more than 100 megahertzs.With one in capacitance connecting three point type oscillator
Electric capacity makes infusion tube clamp between the electric capacity the two poles of the earth as liquid condition detector, due to tube for transfusion has no liquid will be to electric capacity
Value produces considerable influence, therefore has no liquid that the output signal frequency to agitator is produced considerable influence also.
The filter circuit is using passive high-pass filtering electricity.In tube for transfusion for air when the resonant frequency of agitator be higher than
The resonant frequency having in tube for transfusion during liquid, based on this characteristic, the parameter of rational design high pass filter, make tube for transfusion without
Resonant frequency during liquid falls in the passband of high pass filter, and when having liquid, due to the change of capacitance, resonant frequency subtracts
Little, resonant frequency will fall in filter stop bend.
The detecting circuit adopts diode envelope detecting circuit, it be mutually concatenated by diode and RC low pass filters and
The circuit of composition, the output voltage of detecting circuit can reflected input signal without distortion envelope variation, i.e. signal amplitude
Change.
The circuit theory diagrams of capacitance connecting three point type oscillator are as shown in Figure 2.In figure, RB1、RB2And REFor partial pressure type biasing resistor,
Cc、CbAnd CeFor bypass and capacitance, RCFor colelctor electrode DC load resistance, RLFor output load resistance, L, C1And C2For simultaneously
Connection resonant tank.In circuit, as the audion of variable gain device, it is necessary to arrange suitable static work by biasing circuit
Point, to ensure amplification region is operated in during starting of oscillation, there is provided enough gains, meets amplitude starting condition for oscillation.After starting of oscillation, amplitude of oscillation increases
Long, when audion starts to present non-linear amplification characteristic, the gain of amplifier will increase with amplitude of oscillation and reduce.Together
When, the self-supporting deviation effect that biasing circuit is produced further accelerates the decline of amplifier gain.When engineering is estimated, approximately can recognize
For the vibration angular frequency of capacitance connecting three point type oscillatorWhereinC'2=C2+Cb'e.According to electric capacity
The hunting angle frequency computing formula of bikini oscillator, chooses suitable L, C1And C2Value, you can setting agitator oscillation frequency
Rate.The selection of agitator frequency of oscillation should be as larger as possible, and typically in 100MHz or so, such resonant frequency will be to capacitance
Change it is more sensitive, facilitate the design of follow-up filter circuit.
The design of filter circuit can adopt three rank high pass filters, and schematic diagram is as shown in figure 3, wherein CCFor capacitance,
R, L and C are respectively resistance, inductance and the electric capacity of high pass filter.According to the frequency of oscillation of capacitance three-point type, filter circuit is designed
Relevant parameter.The relative dielectric constant of general medicinal fluid is all higher than 40, select the passband initial frequency of high pass filter between
Corresponding frequency of oscillation when being 40 liquid for relative dielectric constant in the frequency of oscillation and tube for transfusion when being air in tube for transfusion
Between.
The schematic diagram of detecting circuit is as shown in figure 4, wherein D diodes, the resistance and electric capacity of R, C difference low pass filter.
The major requirement of cymoscope design is the envelope variation of output voltage reflected input signal without distortion, is air according to tube for transfusion
When corresponding resonant frequency, rational design detecting circuit relevant parameter, you can after cymoscope outfan is obtained after filtering
The amplitude information of output signal, and the amplitude information, can be used as the foundation for judging transfusion liquid in pipe whether there is.
Claims (4)
1. a kind of venous transfusion based on radio frequency method monitors sensor, including agitator, filter circuit and detecting circuit, its feature
It is：Described agitator adopts capacitance connecting three point type oscillator, using any one electric capacity in capacitance connecting three point type oscillator as
Liquid condition detector, adopts parallel plate capacitor as the electric capacity of liquid condition detector, makes infusion tube clamp in parallel plate capacitor
Between the two poles of the earth；Described agitator produces a certain setpoint frequency signal, after the filtered circuit filtering of the signal, then tested wave circuit
Detection, the medicinal liquid state in the voltage value changes reflection tube for transfusion of detecting circuit output.
2. the venous transfusion based on radio frequency method according to claim 1 monitors sensor, it is characterised in that：The filtered electrical
Road is fallen in the passband of filter circuit using passive high-pass filtering electricity, resonant frequency during tube for transfusion no liquid, and tube for transfusion has liquid
Resonant frequency during body falls in the stopband of filter circuit.
3. the venous transfusion based on radio frequency method according to claim 1 monitors sensor, it is characterised in that：The detection electricity
Road adopts diode envelope detecting circuit.
4. the venous transfusion based on radio frequency method according to claim 1 monitors sensor, it is characterised in that：Described liquid
State detector is arranged on the transfusion tube wall between infusion bottle and drop kettle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611013329.7A CN106512144A (en) | 2016-11-17 | 2016-11-17 | Intravenous infusion monitoring sensor based on radio frequency method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611013329.7A CN106512144A (en) | 2016-11-17 | 2016-11-17 | Intravenous infusion monitoring sensor based on radio frequency method |
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| Publication Number | Publication Date |
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| CN106512144A true CN106512144A (en) | 2017-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611013329.7A Pending CN106512144A (en) | 2016-11-17 | 2016-11-17 | Intravenous infusion monitoring sensor based on radio frequency method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108066848A (en) * | 2017-12-25 | 2018-05-25 | 山东理工大学 | A kind of woven hose remote alerting device |
| CN112316248A (en) * | 2020-10-27 | 2021-02-05 | 上海理工大学 | Wireless passive injection liquid infusion tube state monitoring method based on surface acoustic wave technology |
| CN114144212A (en) * | 2019-08-09 | 2022-03-04 | 巴克斯特国际公司 | Capacitive activation sensor for medical fluid delivery system |
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| US3890968A (en) * | 1971-06-25 | 1975-06-24 | Sci Systems Inc | Fluid flow control means |
| CN1143745A (en) * | 1995-12-11 | 1997-02-26 | 张胜杰 | Infusion monitoring reporter |
| CN2422001Y (en) * | 2000-05-16 | 2001-03-07 | 张如意 | Automatic detector for transfusion |
| CN201823122U (en) * | 2010-10-22 | 2011-05-11 | 深圳市超越无限科技有限公司 | Transfusion monitoring alarm |
| US20140100519A1 (en) * | 2007-07-13 | 2014-04-10 | Iradimed Corporation | System and method for communication with an infusion device |
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2016
- 2016-11-17 CN CN201611013329.7A patent/CN106512144A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3890968A (en) * | 1971-06-25 | 1975-06-24 | Sci Systems Inc | Fluid flow control means |
| CN1143745A (en) * | 1995-12-11 | 1997-02-26 | 张胜杰 | Infusion monitoring reporter |
| CN2422001Y (en) * | 2000-05-16 | 2001-03-07 | 张如意 | Automatic detector for transfusion |
| US20140100519A1 (en) * | 2007-07-13 | 2014-04-10 | Iradimed Corporation | System and method for communication with an infusion device |
| CN201823122U (en) * | 2010-10-22 | 2011-05-11 | 深圳市超越无限科技有限公司 | Transfusion monitoring alarm |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108066848A (en) * | 2017-12-25 | 2018-05-25 | 山东理工大学 | A kind of woven hose remote alerting device |
| CN114144212A (en) * | 2019-08-09 | 2022-03-04 | 巴克斯特国际公司 | Capacitive activation sensor for medical fluid delivery system |
| CN114144212B (en) * | 2019-08-09 | 2024-04-26 | 巴克斯特国际公司 | Capacitive actuation sensor for medical fluid delivery system |
| CN112316248A (en) * | 2020-10-27 | 2021-02-05 | 上海理工大学 | Wireless passive injection liquid infusion tube state monitoring method based on surface acoustic wave technology |
| CN112316248B (en) * | 2020-10-27 | 2023-08-15 | 上海理工大学 | Wireless passive injection infusion tube state monitoring device adopting surface acoustic wave technology |
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Application publication date: 20170322 |
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