CN205055053U - Infusion bubble detection circuit - Google Patents
Infusion bubble detection circuit Download PDFInfo
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- CN205055053U CN205055053U CN201520528526.7U CN201520528526U CN205055053U CN 205055053 U CN205055053 U CN 205055053U CN 201520528526 U CN201520528526 U CN 201520528526U CN 205055053 U CN205055053 U CN 205055053U
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Abstract
The utility model discloses an infusion bubble detection circuit, it includes: microcontroller, the drive module who links to each other with microcontroller output, the supersound transmission receiving element who links to each other with drive module, the signal amplifying unit who links to each other with supersound transmission receiving element, link to each other with signal amplifying unit output and feed back to microcontroller's signal processing unit and link to each other with microcontroller output and input and drive module, supersound transmission receiving element, signal amplifying unit, signal processing unit homogeneous phase microcontroller 5 even. The utility model discloses make this technological problem of transfer pump bubble detection obtain effectual solution to making the security and the competitiveness of product obtain very big promotion, carrying out effective bubble detection simultaneously, the design of product is simply easy -to -use, safe and reliable.
Description
Technical field
This utility model relates to a kind of transfusion bubble detection circuit.
Background technology
Venous transfusion be clinical in the most frequently used treatment and nursing procedure.Traditional transfusion adopts gravity infusion, but along with the clinical requirement to transfusion precision more and more higher, the infusion pump that accurately can control infusion flow rate and precision is applied more and more clinically.Today of medical skill develop rapidly, the use of infusion pump and infusion controller is more and more extensive.It with its by a small amount of liquid and medicine accurately, constant, constant speed, continue the feature that pumps in human body, become the conventional equipment in operation and ICU treatment.Bubble detection is a technical barrier in infusion pump, is also a mandatory requirement of security legislation simultaneously.The inefficacy that bubble detects can cause malpractice.And bubble detects too sensitive, client sometimes can be caused again to complain.In addition due to the operation sensitivity causing the difference between pipeline and sensor also may affect bubble detection lack of standardization of medical personnel.For different therapeutic schemes, infusion pump can arrange the demand that different bubble detection sensitivities has become more and more important clinically.
And existing bubble detection generally can pass through infrared detection, capacitance detecting and ultrasound detection three kinds of methods.The theoretical basis of infrared detection is the photoelectric effect of photoelectric device, in liquid conducting pipes when there being bubble because the reflection of light is different with the absorption of different medium to light but light-sensitive device receives the intensity of light changes thus cause the change of output voltage, utilize this principle can distinguish ducted different medium, thus detect air bubble.Existing infrared detection is easily by the impact of environment light source and pipeline whether lucifuge, and infrared detection can produce infrared radiation to liquid, there is the risk of potential pollution medicinal liquid.
The principle of capacitance detecting is the capacitance variations situation of respectively putting in the both sides of liquid-transport pipe-line between a capacitor plate measurement two-plate.According to this change, infer the situation of change of pipeline internal medium, thus reach the object of detection.Because the dielectric constants of air and medical infusion liquid is very large.Capacitance when there being bubble in liquid between capacitor two-plate can obviously change, and can measure in pipeline whether there is bubble according to this characteristic.And the external circuit of capacitance detecting is complicated and very high to capacitance sensor sensitivity requirement when micro-bubble detects, not easily realize, cost is higher.
Ultrasound detection utilizes the absorption of ultrasound wave at gas, liquid and solid and the difference of decay, ultrasound wave is propagated by rectilinear direction in uniform dielectric, but arrives interface or as light wave, also produce reflection when running into different medium and reflect and obey the reflection similar with geometric optics, the law of refraction.The ultrasonic type detector very little penetration capacity that decays in fluid column and solid is strong, has obvious boundary reflection and refraction effect hyperacoustic high frequency characteristics in addition, and main pulse and ultrasonic pulse counting when to be convenient to pair, to judge the length of Air Bubble Size and continuous liquid column.And the ultrasonic bubble measurement circuit design complexity in existing infusion pump, power consumption is high, and cost is high.And existing ultrasonic bubble detection is all can only provide with presence or absence of bubble to detect output signal substantially, the sensitivity that bubble detects needs to be realized by the adjustment of hardware.
Utility model content
This utility model object is: provide a kind of transfusion bubble detection circuit, can carry out effective bubble detection, the simplicity of design of product is easy-to-use, safe and reliable, reduces the risk of user, improves the safety that patient uses infusion pump.
The technical solution of the utility model is: a kind of transfusion bubble detection circuit, and it comprises: microcontroller, to export the driver module be connected, the ultrasound emission receiving element be connected with driver module, the signal amplification unit be connected with ultrasound emission receiving element, to export be connected and feed back to the signal processing unit of microcontroller and export with microcontroller and be connected and export the power module be all connected with driver module, ultrasound emission receiving element, signal amplification unit, signal processing unit with signal amplification unit with microcontroller.
On the basis of technique scheme, comprise following attached technical scheme further:
The modulating wave of 2MHz needed for described driver module generation ultrasound emission receiving element and the fundamental signal of 45KHz.
Described ultrasound emission receiving element sends ultrasonic signal at ultrasound emission end, and ultrasonic wave reception unit is divided, and utilizes the resonant frequency of ultrasonic transducer consistent with generator, receives from passing tube wall, the ultrasonic signal of having decayed after air-gap and liquid.
Fundamental signal detects by described signal processing unit, converts thereof into analogue signal feed back to microcontroller by RC circuit.
Described driver module comprises the stabilivolt that negative pole is connected with microcontroller, the first not gate be connected with stabilivolt positive pole, the first resistance that one end is connected with stabilivolt positive pole, the second not gate be in series with the first not gate, the second resistance that one end is connected with the input of the second not gate, the 3rd not gate be in series with the second not gate, the electric capacity that one end is connected with the input of the 3rd not gate, one end is connected with the outfan of the 3rd not gate and the 3rd resistance of other end ground connection, and the 4th not gate to be in parallel with the 3rd not gate.
Described signal processing unit comprise G hold be connected with signal amplification unit metal-oxide-semiconductor, hold not gate, the NAND gate be connected be connected and export the RC circuit be connected with microcontroller with the D of metal-oxide-semiconductor.
This utility model advantage is:
The complexity that the ultimate principle that this utility model detects based on ultrasonic bubble is designed by the bubble detection circuit of circuit design reduction cleverly, simultaneously in conjunction with some portable infusion pump product to the strict demand of power consumption, by the power consumption effectively reducing bubble detection module of circuit and software.Be exactly finally make it possible to by circuit and software design cleverly the sensitivity that detected by software design patterns bubble.This technical barrier that this utility model makes infusion pump bubble detect effectively is solved, thus make the safety of product and competitiveness obtain very large lifting, carry out effective bubble detection, the simplicity of design of product is easy-to-use simultaneously, safe and reliable, also greatly reduce design cost.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, this utility model is further described:
Fig. 1 is functional block diagram of the present utility model;
Fig. 2 is the circuit diagram of driver module in this utility model.
Fig. 3 is the circuit diagram of signal amplification unit in this utility model.
Fig. 4 is the circuit diagram of signal processing unit in this utility model.
Detailed description of the invention
Embodiment: as Figure 1-4, this utility model provides a kind of specific embodiment of bubble detection circuit of infusing, it comprises: microcontroller, the driver module be connected is exported with microcontroller, the ultrasound emission receiving element be connected with driver module, the signal amplification unit be connected with ultrasound emission receiving element, export with signal amplification unit and be connected and feed back to the signal processing unit of microcontroller, and to export with microcontroller and be connected and export and driver module, ultrasound emission receiving element, signal amplification unit, the power module that signal processing unit is all connected, wherein driver module, ultrasound emission receiving element, signal amplification unit, signal processing unit forms bubble detection module, power control unit provides power supply to bubble detection module.
Microcontroller, for controlling power control unit, gathers bubble detection module and feeds back the analogue signal of coming.
Driver module is for the fundamental signal of the modulating wave and 45KHz that generate the 2MHz needed for ultrasound emission receiving element, it comprises the stabilivolt D12 that negative pole is connected with microcontroller, the first not gate be connected with stabilivolt D12 positive pole, the first resistance R153 that one end is connected with stabilivolt D12 positive pole, the second not gate be in series with the first not gate, the second resistance R154 that one end is connected with the input of the second not gate, the 3rd not gate be in series with the second not gate, the electric capacity that one end is connected with the input of the 3rd not gate, one end is connected with the outfan of the 3rd not gate and the 3rd resistance R155 of other end ground connection, and the 4th not gate to be in parallel with the 3rd not gate, resistance capacitance value wherein in driver module determines the resonance wave frequency of generation, namely the frequency of the modulating wave of 2MHZ and the fundamental signal of 45Khz is mentioned above.
Ultrasound emission receiving element sends ultrasonic signal at ultrasound emission end, and ultrasonic wave reception unit is divided, and utilizes the resonant frequency of ultrasonic transducer consistent with generator, receives from passing tube wall, the ultrasonic signal of having decayed after air-gap and liquid.
Signal amplification unit is responsible for the small-signal from ultrasound emission receiving element to carry out processing and amplifying.The circuit of signal magnification processing as shown in Figure 3, comprises the operational amplifier that two-stage is connected.
Signal processing unit is responsible for fundamental signal to detect, and then converts thereof into analogue signal by RC circuit and feeds back to microcontroller.The circuit of signal processing unit as shown in Figure 4, comprise G hold be connected with signal amplification unit metal-oxide-semiconductor, hold not gate, the NAND gate be connected be connected and export the RC circuit be connected with microcontroller with the D of metal-oxide-semiconductor.
Power control unit by microprocessor controls for whole bubble detection module provides power supply.
Bubble detection module first opened by microcontroller power control unit when detecting bubble produces resonance wave simultaneously, after time delay certain hour (being more than or equal to 20us), AD sampling being carried out to the analogue signal of the signal processing unit be input in microcontroller, after sampling, closing the power supply of bubble detection module in order to reduce power consumption at once.Next carry out signal processing to the AD signal collected, the AD value collected if current is greater than AD value corresponding to the sensitivity of software set, thinks do not have bubble, otherwise thinks there is bubble.If continuous three times all detect same state, then software judges to detect that stable bubble has or the state of nothing.The state that last basis detects goes setting bubble report to the police or remove bubble alarm condition.
Certain above-described embodiment, only for technical conceive of the present utility model and feature are described, its object is to person skilled in the art can be understood content of the present utility model and implement according to this, can not limit protection domain of the present utility model with this.All equivalent transformations of doing according to the spirit of this utility model main technical schemes or modification, all should be encompassed within protection domain of the present utility model.
Claims (6)
1. to infuse a bubble detection circuit, it is characterized in that it comprises: microcontroller, to export the driver module be connected, the ultrasound emission receiving element be connected with driver module, the signal amplification unit be connected with ultrasound emission receiving element with microcontroller, to export with signal amplification unit and be connected and feed back to the signal processing unit of microcontroller and export with microcontroller and be connected and export the power module be all connected with driver module, ultrasound emission receiving element, signal amplification unit, signal processing unit.
2. a kind of transfusion bubble detection circuit as claimed in claim 1, is characterized in that: the modulating wave of 2MHz needed for described driver module generation ultrasound emission receiving element and the fundamental signal of 45KHz.
3. a kind of transfusion bubble detection circuit as claimed in claim 2, it is characterized in that: described ultrasound emission receiving element sends ultrasonic signal at ultrasound emission end, ultrasonic wave reception unit is divided, and utilizes the resonant frequency of ultrasonic transducer consistent with generator, receive from through tube wall, the ultrasonic signal of having decayed after air-gap and liquid.
4. a kind of transfusion bubble detection circuit as claimed in claim 2 or claim 3, is characterized in that: fundamental signal detects by described signal processing unit, converts thereof into analogue signal feed back to microcontroller by RC circuit.
5. a kind of transfusion bubble detection circuit as claimed in claim 2 or claim 3, it is characterized in that: described driver module comprises: the stabilivolt that negative pole is connected with microcontroller, the first not gate be connected with stabilivolt positive pole, the first resistance that one end is connected with stabilivolt positive pole, the second not gate be in series with the first not gate, the second resistance that one end is connected with the input of the second not gate, the 3rd not gate be in series with the second not gate, the electric capacity that one end is connected with the input of the 3rd not gate, one end is connected with the outfan of the 3rd not gate and the 3rd resistance of other end ground connection, and the 4th not gate to be in parallel with the 3rd not gate.
6. transfusion bubble detection circuit as claimed in claim 4 a kind of, is characterized in that: described signal processing unit comprise G hold be connected with signal amplification unit metal-oxide-semiconductor, hold not gate, the NAND gate be connected be connected and export the RC circuit be connected with microcontroller with the D of metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520528526.7U CN205055053U (en) | 2015-07-21 | 2015-07-21 | Infusion bubble detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520528526.7U CN205055053U (en) | 2015-07-21 | 2015-07-21 | Infusion bubble detection circuit |
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| CN205055053U true CN205055053U (en) | 2016-03-02 |
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| CN201520528526.7U Active CN205055053U (en) | 2015-07-21 | 2015-07-21 | Infusion bubble detection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106075668A (en) * | 2016-08-12 | 2016-11-09 | 董稳 | Air detection device in a kind of infusion pipeline |
| CN113134129A (en) * | 2020-01-20 | 2021-07-20 | 深圳迈瑞科技有限公司 | Infusion pump and infusion pump bubble detection method |
| CN114137041A (en) * | 2021-11-18 | 2022-03-04 | 西南石油大学 | Automatic detection device for foam of gas production by foam discharge at well mouth |
-
2015
- 2015-07-21 CN CN201520528526.7U patent/CN205055053U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106075668A (en) * | 2016-08-12 | 2016-11-09 | 董稳 | Air detection device in a kind of infusion pipeline |
| CN113134129A (en) * | 2020-01-20 | 2021-07-20 | 深圳迈瑞科技有限公司 | Infusion pump and infusion pump bubble detection method |
| CN114137041A (en) * | 2021-11-18 | 2022-03-04 | 西南石油大学 | Automatic detection device for foam of gas production by foam discharge at well mouth |
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