CN112843381B - A wheel-type piezoelectric precision infusion pump with alarm function - Google Patents
A wheel-type piezoelectric precision infusion pump with alarm function Download PDFInfo
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- CN112843381B CN112843381B CN202110222014.8A CN202110222014A CN112843381B CN 112843381 B CN112843381 B CN 112843381B CN 202110222014 A CN202110222014 A CN 202110222014A CN 112843381 B CN112843381 B CN 112843381B
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- 238000001802 infusion Methods 0.000 title claims abstract description 48
- 238000007789 sealing Methods 0.000 claims abstract description 44
- 239000000758 substrate Substances 0.000 claims abstract description 36
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 230000009471 action Effects 0.000 claims description 7
- 230000007246 mechanism Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 2
- 230000002452 interceptive effect Effects 0.000 claims 2
- 239000007788 liquid Substances 0.000 abstract description 31
- 239000003814 drug Substances 0.000 abstract description 26
- 230000000694 effects Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 235000012431 wafers Nutrition 0.000 description 17
- 230000005684 electric field Effects 0.000 description 10
- 239000012530 fluid Substances 0.000 description 5
- 230000003993 interaction Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 238000005086 pumping Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012377 drug delivery Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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
- A61M5/142—Pressure infusion, e.g. using pumps
-
- 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
- A61M5/16804—Flow controllers
-
- 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
-
- 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
- A61M5/172—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 electrical or electronic
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
Landscapes
- Health & Medical Sciences (AREA)
- Hematology (AREA)
- General Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Veterinary Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Public Health (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Reciprocating Pumps (AREA)
Abstract
本发明公开了一种带报警功能的轮式压电精密输液泵，包括有壳体、基板、密封膜、入口单向阀、出口单向阀和报警系统，其中基板、密封膜、入口单向阀和出口单向阀均集成在壳体的内腔中，基板装配在壳体内腔的上部，基板上设置有电阻应变片和压电晶片，电阻应变片与报警系统相连接，报警系统根据电阻应变片的传输数据进行工作，密封膜设在基板的下部，密封膜与基板之间设置有连接柱，有益效果：实现了药液泵出后无死角容积对药液造成污染,同时，药液泵出后，不存在死角容积对药液造成污染。出口单向阀和轮式截止阀叠加能够防止药物的回流，同时满足所需功能。本发明装配有传感电路、测量电路和报警电路使输液泵堵塞时有反馈示警的效果。
The present invention discloses a wheel-type piezoelectric precision infusion pump with an alarm function, comprising a housing, a substrate, a sealing film, an inlet one-way valve, an outlet one-way valve and an alarm system, wherein the substrate, the sealing film, the inlet one-way valve and the outlet one-way valve are all integrated in the inner cavity of the housing, the substrate is assembled at the upper part of the inner cavity of the housing, a resistance strain gauge and a piezoelectric chip are arranged on the substrate, the resistance strain gauge is connected to the alarm system, the alarm system works according to the transmission data of the resistance strain gauge, the sealing film is arranged at the lower part of the substrate, and a connecting column is arranged between the sealing film and the substrate, and the beneficial effect is: it is realized that there is no dead angle volume to pollute the medicine liquid after the medicine liquid is pumped out, and at the same time, there is no dead angle volume to pollute the medicine liquid after the medicine liquid is pumped out. The superposition of the outlet one-way valve and the wheel-type stop valve can prevent the backflow of the medicine and meet the required functions at the same time. The present invention is equipped with a sensing circuit, a measuring circuit and an alarm circuit to have a feedback alarm effect when the infusion pump is blocked.
Description
Technical Field
The invention relates to a piezoelectric precise infusion pump, in particular to a wheel type piezoelectric precise infusion pump with an alarm function.
Background
In recent years, with the rapid development of micro-electro-mechanical system technology, a micro-fluidic control system, which is an important branch of the micro-electro-mechanical system technology, is favored because of high control accuracy, small size and low power consumption. Micropump is an important component constituting a fluid control system, which can precisely control the flow rate of liquid.
Compared with other micropumps driven by the piezoelectric micropump, the piezoelectric micropump has the advantages of simple structure, small volume, light weight, low noise, no electromagnetic interference, capability of controlling output flow by applying different voltages and frequencies, and the like, and has wide application prospects in the fields of drug delivery, synthesis, micro-fluid synthesis and precise control.
At present, the piezoelectric infusion micropump does not need an additional driving motor, but utilizes the reverse voltage effect of piezoelectric ceramics to deform a piezoelectric vibrator so as to drive the volume of a pump cavity to generate periodical change to realize fluid output. The existing piezoelectric infusion micropump has the following problems:
1. The initial net volume is larger, and the piezoelectric micropump is difficult to self-priming;
2. The valve plate is easy to fatigue and wear, and particles in the liquid are likely to be adsorbed on the valve plate, so that a system is blocked;
3. the pump cavity of the micropump has a height, and dead angle volume can pollute liquid when pumping the liquid.
Disclosure of Invention
The invention aims to solve the problems commonly existing in the use process of the traditional piezoelectric infusion micropump and provides a wheel type piezoelectric precision infusion pump with an alarm function.
The invention provides a wheel type piezoelectric precision infusion pump with an alarm function, which comprises a shell, a base plate, a sealing film, an inlet check valve, an outlet check valve and an alarm system, wherein the base plate, the sealing film, the inlet check valve and the outlet check valve are all integrated in an inner cavity of the shell, the base plate is assembled at the upper part of the inner cavity of the shell, a resistance strain gauge and a piezoelectric wafer are arranged on the base plate, the resistance strain gauge is connected with the alarm system, the alarm system works according to transmission data of the resistance strain gauge, the sealing film is arranged at the lower part of the base plate, a connecting column is arranged between the sealing film and the base plate, the inlet check valve and the outlet check valve are sequentially arranged at the bottom of the sealing film, the inlet check valve and the first through hole are arranged on the inlet check valve, the outlet check valve and the second through hole are arranged corresponding to the inlet valve, the first through hole is arranged corresponding to the outlet valve, an infusion channel is arranged in the shell, the second through hole and the inlet check valve and the inlet of the infusion channel are communicated with the inlet of the infusion channel, and the first through hole and the outlet valve are communicated with the outlet of the infusion channel.
The base plate is spoke type metal base plate, and the resistance strain gauge of assembly on the base plate is provided with two, and two resistance strain gauge correspond to paste on the top surface of base plate, and the piezoelectric wafer of assembly on the base plate is provided with four, and four piezoelectric wafer are two-to-two paste respectively in the top surface and the bottom surface of base plate, and the assembly axis of resistance strain gauge is mutually perpendicular with the assembly axis of piezoelectric wafer.
The bottom surface of the sealing film and the top surface of the inlet one-way valve plate are packaged together in a close fit mode, and when the sealing film warps upwards along with the substrate, a channel is formed between the bottom surface of the sealing film and the top surface of the inlet one-way valve plate and is communicated with the infusion channel in the shell.
The alarm system is connected with a power supply, the alarm system is formed by providing electric energy by the power supply, the alarm system is composed of a sensor, a controller and an interaction mechanism, wherein the sensor is composed of a lead wire on a resistance strain gauge on a substrate, an amplifying circuit and an analog-digital converter, the controller is a circuit board integrated with a microcontroller and a micro-control circuit, the sensor is connected with the circuit board, the micro-control circuit in the controller comprises a key circuit, a display circuit and a buzzer circuit, the interaction mechanism comprises a key, an OLED display screen and a buzzer, the OLED display screen can display a real-time strain value, the key is used for setting an alarm threshold value, the measured strain value is higher than the threshold buzzer to give an alarm, otherwise, the resistance strain gauge on the substrate does not give an alarm, when the substrate deforms under the action of a piezoelectric wafer, the resistance strain gauge generates corresponding strain, the resistance strain gauge obtains the change of corresponding voltage by using the bridge circuit, an analog voltage signal is converted into a high-precision digital quantity by the analog-digital converter to be transmitted into the microcontroller, the microcontroller is processed by the microcontroller, then the micro-controller is processed into the digital quantity, the display circuit is used for displaying the display value, the display value is higher than the amplitude value, and the piezoelectric liquid is more slowly-phase-changed into a square wave signal when the amplitude value is higher than the amplitude value, and the amplitude value is higher than the amplitude value of a square wave signal is set in a piezoelectric vibrator, and the piezoelectric vibrator is more than a positive when the amplitude value is more than a vibration value.
The connecting column arranged between the sealing film and the substrate is a flexible connecting column, and the flexible connecting column can deform along with the deformation of the substrate.
The inlet valve arranged on the inlet check valve and the outlet valve arranged on the outlet check valve are cantilever type check valves, the bottom of the outlet check valve is also provided with a wheel type stop valve, and the wheel type stop valve is arranged corresponding to the outlet of the infusion channel.
The above-mentioned resistance strain gauge, piezoelectric wafer and alarm system are all the equipment of current equipment, therefore, specific model and specification do not carry out the description again.
The working principle of the invention is as follows:
According to the wheel type piezoelectric precision infusion pump with the alarm function, the piezoelectric vibrator is enabled to displace under the action of the inverse piezoelectric effect by applying the external electric field to the piezoelectric vibrator, and the piezoelectric vibrator generates periodic displacement along with the action of alternating voltage, so that unidirectional flow of fluid in a pump cavity is realized.
When the positive voltage with larger external electric field acts on the two ends of the piezoelectric material, the piezoelectric wafer deforms, so that the piezoelectric vibrator bends upwards to deform, the flexible connecting column is driven to displace upwards, and a channel is generated between the sealing film and the inlet one-way valve to form a pump cavity. And simultaneously, an inlet valve on the inlet one-way valve is opened, an outlet valve on the outlet one-way valve is closed, and the liquid medicine is pumped.
When a negative voltage with a smaller external electric field acts on two ends of the piezoelectric material, the piezoelectric wafer starts to recover deformation, and drives the flexible connecting column to displace downwards, so that a channel between the sealing film and the inlet one-way valve is reduced. And simultaneously, an inlet valve on the inlet check valve is closed, an outlet valve and a wheel type stop valve on the outlet check valve are opened, and the liquid medicine is pumped out. When the liquid medicine is completely pumped out, the piezoelectric vibrator and the sealing film recover deformation.
When the outlet of the piezoelectric infusion pump is blocked, the liquid medicine in the infusion pump cannot be pumped out smoothly, and the piezoelectric vibrator and the sealing film cannot recover deformation. Then, the external electric field signal enters the next period, namely, the external electric field is changed from negative voltage to positive voltage, and the infusion pump pumps the liquid medicine again. When the period of pumping in the liquid medicine is ended, the deformation amounts of the piezoelectric vibrator and the sealing film are increased again because the liquid medicine in the previous period is not completely discharged. The deformation amount of the resistance strain gauge bonded to the spoke-type piezoelectric vibrator increases beyond the maximum value of the deformation amount of the piezoelectric vibrator. Therefore, when the outlet one-way valve of the piezoelectric infusion pump is blocked, but the piezoelectric infusion pump still pumps liquid continuously, the alarm system can play a role in warning.
The invention has the beneficial effects that:
In the wheel type piezoelectric precision infusion pump with the alarm function, the sealing film and the inlet one-way valve are tightly sealed in an attached mode in an initial state. This means that wheeled piezoelectricity precision infusion pump does not have initial pump chamber height, has also realized simultaneously that no dead angle volume causes the pollution to the liquid medicine after the liquid medicine pumps, simultaneously, does not have the dead angle volume to cause the pollution to the liquid medicine after the liquid medicine pumps. The outlet check valve and the wheel type stop valve are overlapped to prevent the backflow of the medicine and simultaneously meet the required functions. The invention is provided with a sensing circuit, a measuring circuit and an alarm circuit, so that the infusion pump is blocked with feedback warning effect.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the infusion pump according to the present invention.
Fig. 2 is an exploded view of the infusion pump according to the present invention.
Fig. 3 is a schematic diagram of the drug feeding process of the infusion pump.
Fig. 4 is a schematic diagram of the principle of the infusion pump drug delivery process according to the invention.
FIG. 5 is a block diagram of the alarm system according to the present invention.
The labels in the above figures are as follows:
1. Casing 2, base plate 3, sealing film 4, inlet check valve 5, and outlet check valve
6. Alarm system 7, resistance strain gauge 8, piezoelectric wafer 9 and connecting column
10. Inlet valve 11, first through hole 12, outlet valve 13, second through hole
14. Infusion channel 15, wheel type stop valve 16, power supply 17, sensor 18 and controller
19. Interaction means 20, amplification circuit 21, analog-to-digital converter 22, microcontroller
23. Button circuit 24, display circuit 25, buzzer circuit 26, and button
27. OLED display 28, buzzer.
Detailed Description
Please refer to fig. 1 to 5:
The invention provides a wheel type piezoelectric precision infusion pump with an alarm function, which comprises a shell 1, a base plate 2, a sealing film 3, an inlet check valve 4, an outlet check valve 5 and an alarm system 6, wherein the base plate 2, the sealing film 3, the inlet check valve 4 and the outlet check valve 5 are integrated in the inner cavity of the shell 1, the base plate 2 is assembled at the upper part of the inner cavity of the shell 1, a resistance strain gauge 7 and a piezoelectric wafer 8 are arranged on the base plate 2, the resistance strain gauge 7 is connected with the alarm system 6, the alarm system 6 works according to transmission data of the resistance strain gauge 7, the sealing film 3 is arranged at the lower part of the base plate 2, a connecting column 9 is arranged between the sealing film 3 and the base plate 2, the inlet check valve 4 and the outlet check valve 5 are sequentially arranged at the bottom of the sealing film 3, an inlet check valve 10 and a first through hole 11 are arranged on the inlet check valve 4, an outlet check valve 12 and a second through hole 13 are arranged on the outlet check valve 5, the second through hole 13 is arranged corresponding to the inlet valve 10, the first through hole 11 is arranged corresponding to the outlet valve 12, an infusion channel 14 is arranged in the shell 1, the second through hole 13 is communicated with the first through hole 14 and the first through hole 14, and the infusion channel 14 is communicated with the first through the outlet channel 14.
The base plate 2 is a spoke type metal base plate, two resistance strain gauges 7 assembled on the base plate 2 are arranged, the two resistance strain gauges 7 are correspondingly stuck on the top surface of the base plate 2, four piezoelectric wafers 8 assembled on the base plate 2 are arranged, the four piezoelectric wafers 8 are stuck on the top surface and the bottom surface of the base plate 2 in pairs, and the assembly axis of the resistance strain gauges 7 is perpendicular to the assembly axis of the piezoelectric wafers 8.
The bottom surface of the sealing film 3 and the top surface of the inlet one-way valve 4 are tightly sealed together, and when the sealing film 3 warps upwards along with the substrate 2, a channel is formed between the bottom surface of the sealing film 3 and the top surface of the inlet one-way valve 4, and the channel is communicated with the infusion channel 14 in the shell 1.
The alarm system 6 is connected with a power supply 16, the alarm system 6 is powered by the power supply 16, the alarm system 6 is composed of a sensor 17, a controller 18 and an interaction mechanism 19, wherein the sensor 17 is composed of an outgoing line on a resistance strain gauge 7 on a substrate 2, which is connected with an amplifying circuit 20 and an analog-digital converter 21, the controller 18 is a circuit board integrated with a microcontroller 22 and a micro-control circuit, the sensor 17 is connected with the circuit board, the micro-control circuit in the controller 18 comprises a key circuit 23, a display circuit 24 and a buzzer circuit 25, the interaction mechanism 19 comprises a key 26, an OLED display screen 27 and a buzzer 28, the OLED display screen 27 can display a real-time strain value, the key 26 is used for setting an alarm threshold, the measured strain value is higher than the threshold buzzer 28 to give an alarm, otherwise, the resistance strain gauge 7 on the substrate 2 does not form a strain bridge, when the substrate 2 deforms under the action of the piezoelectric wafer 8, the resistance strain gauge 7 generates corresponding strain, the resistance strain gauge 7 obtains corresponding voltage change by utilizing a bridge circuit, an analog voltage signal is converted into a high-precision digital quantity by the analog-digital converter 21 and is transmitted to the microcontroller 22, the microcontroller 22 finishes the processing of the digital quantity, and then the display circuit 24 is used for driving the display part to finish information exchange, a measured strain value is obtained on the OLED display 27 screen, if the measured strain value exceeds the set maximum value of the piezoelectric vibrator strain, the buzzer 28 sends out a warning signal, the buzzer sends out a warning signal, the signal for controlling the piezoelectric vibrator is an asymmetric square wave signal, in one period, when the voltage amplitude is a larger positive value, liquid is slowly pumped into the shell 1, and when the voltage amplitude is a smaller negative value, the rebound speed of the sealing film 3 is increased, and the liquid medicine is pumped out.
The connection column 9 provided between the sealing film 3 and the substrate 2 is a flexible connection column which can be deformed along with the deformation of the substrate 2.
The inlet valve 10 arranged on the inlet check valve 4 and the outlet valve 12 arranged on the outlet check valve 5 are cantilever type check valves, the bottom of the outlet check valve 5 is also provided with a wheel type stop valve 15, and the wheel type stop valve 15 is arranged corresponding to the outlet of the infusion channel 14.
The above-mentioned resistance strain gauge 7, piezoelectric wafer 8 and alarm system 6 are all the assembly of the existing equipment, therefore, specific models and specifications are not repeated.
The working principle of the invention is as follows:
According to the wheel type piezoelectric precision infusion pump with the alarm function, the piezoelectric vibrator is enabled to displace under the action of the inverse piezoelectric effect by applying the external electric field to the piezoelectric vibrator, and the piezoelectric vibrator generates periodic displacement along with the action of alternating voltage, so that unidirectional flow of fluid in a pump cavity is realized.
When a positive voltage with a large external electric field acts on two ends of the piezoelectric material, the piezoelectric wafer 8 deforms, so that the piezoelectric vibrator is bent upwards to deform, the flexible connecting column 9 is driven to displace upwards, and a channel is formed between the sealing membrane 3 and the inlet one-way valve 4 to form a pump cavity. At the same time, the inlet valve 10 on the inlet check valve 4 is opened, the outlet valve 12 on the outlet check valve 5 is closed, and the liquid medicine is pumped.
When a negative voltage with a smaller external electric field acts on two ends of the piezoelectric material, the piezoelectric wafer 8 starts to recover deformation, and drives the flexible connecting column 9 to displace downwards, so that a channel between the sealing membrane 3 and the inlet one-way valve 4 is reduced. At the same time, the inlet valve 10 on the inlet check valve 4 is closed, the outlet valve 12 and the wheel type stop valve 15 on the outlet check valve 5 are opened, and the liquid medicine is pumped out. When the liquid medicine is completely pumped out, the piezoelectric vibrator and the sealing membrane 3 recover to deform.
When the outlet of the piezoelectric infusion pump is blocked, the liquid medicine in the infusion pump cannot be pumped out smoothly, and the piezoelectric vibrator and the sealing membrane 3 cannot recover deformation. Then, the external electric field signal enters the next period, namely, the external electric field is changed from negative voltage to positive voltage, and the infusion pump pumps the liquid medicine again. When the period of pumping in the liquid medicine is ended, since the liquid medicine of the previous period is not completely discharged, the deformation amounts of the piezoelectric vibrator and the sealing film 3 are increased again. The deformation amount of the resistive strain gauge 7 bonded to the spoke-type piezoelectric vibrator increases beyond the maximum value of the deformation amount of the piezoelectric vibrator. So when the outlet one-way valve 5 of the piezoelectric infusion pump is blocked, but the piezoelectric infusion pump still pumps in liquid continuously, the alarm system 6 can play a role of warning.
Claims (1)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110222014.8A CN112843381B (en) | 2021-02-28 | 2021-02-28 | A wheel-type piezoelectric precision infusion pump with alarm function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110222014.8A CN112843381B (en) | 2021-02-28 | 2021-02-28 | A wheel-type piezoelectric precision infusion pump with alarm function |
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| CN112843381A CN112843381A (en) | 2021-05-28 |
| CN112843381B true CN112843381B (en) | 2024-11-22 |
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| CN114987727B (en) * | 2022-06-16 | 2024-02-23 | 中国船舶重工集团公司第七一九研究所 | Self-powered disturbance suppression device for pump valve pipe network of ship power system |
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