Piezoelectric micropump injector with flow monitoring function

Abstract

The invention discloses a piezoelectric micropump injector with a flow monitoring function, and relates to the technical field of medical equipment.The piezoelectric micropump injector comprises a base and a circuit board, a microprocessor is fixedly mounted on the circuit board, a mounting seat is fixedly arranged on the circuit board, a micro-flow control pump is fixedly mounted on the mounting seat, a needle is fixedly arranged on the base, and the micro-flow control pump is fixedly arranged on the needle. An output pipe is arranged at the output end of the micro-flow control pump and is connected with the needle head, a socket and a clamping seat are arranged on the base, a liquid storage device is inserted into the socket, a suction pipe is arranged on the socket and is communicated with the liquid storage device, the end part of the suction pipe is connected with the input end of the micro-flow control pump, and the micro-flow control pump is heated after being electrified. The fluid takes away heat when flowing, the temperature change of the second thermistor is caused, the resistance value change is caused by the temperature change and is converted into an electric signal through the bridge circuit, and the microprocessor calculates the flow according to a thermodynamic formula such as the Kin's law, so that the injection amount is accurately monitored and controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more specifically, it relates to a piezoelectric micropump syringe with a flow monitoring function. Background Art

[0002] Micropump syringes can accurately, uniformly, and continuously pump a small amount of liquid medicine into the body, and are suitable for critically ill or pain patients. They can control blood pressure, adjust blood sugar, relieve pain and sedation, and perform intravenous chemotherapy, etc. Micropump syringes are an important medical device that can provide accurate, safe, and effective treatment methods for patients who need continuous and slow drug administration.

[0003] The structures of the existing micro syringes on the market are complex and the operations are cumbersome. According to the patent publicly disclosed on the Chinese Patent Network, the patent name is: A high-precision chip-type micropump wearable precision syringe, and the patent application number is: 202410922737.2. This patent discloses a micropump syringe. The hydraulic liquid supply chamber is pumped to a vacuum to form a negative pressure. Then, the tip of the liquid filling injection needle pierces the heparin cap, and the liquid medicine driving liquid is pressed into the hydraulic liquid supply chamber, and the extrusion pushing unit seal is moved to one side. The volume of the hydraulic liquid supply chamber increases, and the liquid medicine driving liquid enters the micropump unit through the micropump liquid inlet hole. Since the swing of the micropump unit is a fixed value each time, the precise drive and control of the liquid medicine driving liquid are realized, and the injection volume is precisely controlled. However, its structure is complex, there are many internal components, it is difficult for users to operate quickly, and the protection effect on the liquid medicine stored inside is average. Summary of the Invention

[0004] (I) Technical Problems to be Solved Aiming at the problems existing in the prior art, the present invention provides a piezoelectric micropump syringe with a flow monitoring function to solve the technical problems mentioned in the background art.

[0005] (II) Technical Solutions To achieve the above object, the present invention provides the following technical solution: A piezoelectric micropump syringe with a flow monitoring function, including a base and a circuit board. The circuit board is fixedly installed on the base. A battery is clamped on the circuit board. A microprocessor is fixedly installed on the circuit board. A mounting seat is fixedly arranged on the circuit board. A micro flow control pump is fixedly installed on the mounting seat. A needle is fixedly arranged on the base. The output end of the micro flow control pump is provided with an output pipe and is connected to the needle. A socket and a card seat are arranged on the base. A liquid reservoir is inserted into the socket. A suction pipe is arranged on the socket and is communicated with the liquid reservoir. The end of the suction pipe is connected to the input end of the micro flow control pump.

[0006] The present invention is further arranged such that a liquid storage cavity is arranged inside the liquid reservoir, a sealing plug is slidably arranged in the liquid storage cavity, and a sealing ring is sleeved on the sealing plug.

[0007] The present invention is further configured such that there are two sets of the sealing rings, which improves the sealing effect.

[0008] The present invention is further configured such that a positioning head is provided on the liquid storage device, a positioning groove is provided on the card seat, and the positioning head is clamped in the positioning groove, which is convenient for clamping the liquid storage device.

[0009] The present invention is further configured such that the micro-flow control pump is composed of a piezoelectric micro-pump, a base, a piezoelectric ceramic, a first thermistor, a micro-heater, a second thermistor and a housing. The piezoelectric micro-pump is fixedly arranged in the housing. The base and the piezoelectric ceramic form an oscillator and are arranged in the piezoelectric micro-pump. A pipeline is arranged in the housing and communicated with the piezoelectric micro-pump. The first thermistor, the micro-heater and the second thermistor are arranged in sequence on the pipeline, which is convenient for quantitatively injecting the liquid medicine.

[0010] (III) Beneficial effects Compared with the prior art, the present invention provides a piezoelectric micro-pump syringe with a flow monitoring function, and has the following beneficial effects: First, by providing a liquid storage device, a micro-flow control pump, a battery, a micro-processor and a needle, when using the piezoelectric micro-pump syringe to inject drugs, the piezoelectric micro-pump uses an oscillator composed of a piezoelectric ceramic and a base as the main component. When an alternating current signal is applied to the piezoelectric ceramic, due to the inverse piezoelectric effect, periodic stress will be generated in the piezoelectric ceramic, so that the oscillator makes a reciprocating motion at the same electrical signal frequency. Since the lower chamber of this device is a slit with a height of 30μm, the vibration of the oscillator causes a rapid change in the gas flow velocity and pressure in the narrow gap, thereby generating a pressure difference to drive the fluid to flow in a specific direction. When the liquid medicine in the liquid storage device is extracted, a negative pressure is generated in the liquid storage device, so that the sealing plug moves along with the extraction of the liquid medicine, and the liquid medicine in the liquid storage device can be stably injected into the user's body. It has high stability, a simple overall structure, convenient operation and strong practicability.

[0011] Second, by providing the first thermistor, the micro-heater and the second thermistor, when quantitatively injecting the liquid medicine, the monitoring of the flow rate is composed of the first thermistor, the second thermistor and the micro-heater. After the micro-heater is powered on, it heats up. When the fluid flows through, it takes away the heat, resulting in a temperature change of the second thermistor. The temperature change causes a change in the resistance value, which is converted into an electrical signal through a bridge circuit. The micro-processor calculates the flow rate according to thermodynamic formulas such as King's law, so as to accurately monitor and control the injection volume.

[0012] III. By setting a sealing plug and sealing rings, when storing the liquid medicine, the two groups of sealing rings cooperate with the sealing plug to form a double-layer sealing ring, preventing overturning during the movement process. The sealing rings can prevent the liquid medicine from contacting the air, preventing the oxidation of the liquid medicine components, and at the same time preventing the mixing of air and liquid medicine caused by the shaking of the device. When the micropump pumps away part of the liquid medicine from the lower part of the liquid storage device, a negative pressure state will be formed under the liquid storage device. Due to the sealing effect of the sealing rings, the sealing plug will move downward to balance the upper and lower pressures of the sealing rings, and the protection effect on the liquid medicine is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a first axonometric structural schematic diagram of the present invention; Figure 2 is a second axonometric structural schematic diagram of the present invention; Figure 3 is a third axonometric structural schematic diagram of the present invention; Figure 4 is a structural schematic diagram of the micro flow control pump in the present invention.

[0014] In the figure: 1, base; 2, circuit board; 3, battery; 4, microprocessor; 5, mounting seat; 6, micro flow control pump; 7, needle; 8, output pipe; 9, socket; 10, card holder; 11, liquid storage device; 12, sealing plug; 13, sealing ring; 14, positioning head; 15, piezoelectric micropump; 16, substrate; 17, piezoelectric ceramic; 18, first thermistor; 19, micro heater; 20, second thermistor; 21, housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0016] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0017] In the present invention, unless otherwise stated, the orientations such as "upper, lower" are usually in the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions; similarly, for the convenience of understanding and description, "left, right" are usually in the left and right shown in the drawings; "inside, outside" refer to the inside and outside relative to the contour of each component itself, but the above orientation terms do not limit the present invention.

[0018] Please refer to Figures 1-4, A piezoelectric micropump syringe with a flow monitoring function, comprising a base 1 and a circuit board 2. The circuit board 2 is fixedly installed on the base 1. A battery 3 is clamped on the circuit board 2. A microprocessor 4 is fixedly installed on the circuit board 2. A mounting seat 5 is fixedly arranged on the circuit board 2. A micro flow control pump 6 is fixedly installed on the mounting seat 5. A needle 7 is fixedly arranged on the base 1. The output end of the micro flow control pump 6 is provided with an output pipe 8 which is connected to the needle 7. A socket 9 and a clamping seat 10 are arranged on the base 1. A liquid reservoir 11 is inserted into the socket 9. A suction pipe is arranged on the socket 9 and communicated with the liquid reservoir 11. The end of the suction pipe is connected to the input end of the micro flow control pump 6. A liquid storage cavity is arranged inside the liquid reservoir 11. A sealing plug 12 is slidably arranged in the liquid storage cavity. A sealing ring 13 is sleeved on the sealing plug 12. There are two groups of the sealing rings 13. A positioning head 14 is arranged on the liquid reservoir 11. A positioning groove is arranged on the clamping seat 10. The positioning head 14 is clamped in the positioning groove. The micro flow control pump 6 is composed of a piezoelectric micropump 15, a base 16, a piezoelectric ceramic 17, a first thermistor 18, a micro heater 19, a second thermistor 20 and a housing 21. The piezoelectric micropump 15 is fixedly arranged in the housing 21. The base 16 and the piezoelectric ceramic 17 form an oscillator and are arranged in the piezoelectric micropump 15. A pipeline is arranged in the housing 21 and communicated with the piezoelectric micropump 15. The first thermistor 18, the micro heater 19 and the second thermistor 20 are arranged in sequence on the pipeline.

[0019] Specifically, when using a piezoelectric micropump syringe to inject drugs, the piezoelectric micropump 15 consists of a piezoelectric ceramic 17 and a substrate 16 that form an oscillator as the main component. When an alternating current signal is applied to the piezoelectric ceramic 17, due to the inverse piezoelectric effect, periodic stress will be generated in the piezoelectric ceramic 17, causing the oscillator to perform reciprocating motion at the same frequency as the electrical signal. Since the lower chamber of this device is a slit with a height of 30 μm, the vibration of the oscillator causes rapid changes in the gas flow rate and pressure within the narrow gap, thereby generating a pressure difference to drive the directional flow of the fluid. When the liquid medicine in the liquid storage device 11 is extracted, a negative pressure is generated in the liquid storage device 11, causing the sealing plug 12 to move along with the extraction of the liquid medicine, and the liquid medicine in the liquid storage device 11 can be stably injected into the user's body. The flow rate monitoring is composed of a first thermistor 18, a second thermistor 20, and a micro heater 19. After the micro heater 19 is powered on, it heats up. When the fluid flows through, it takes away heat, causing the temperature of the second thermistor 20 to change. The temperature change causes a change in the resistance value, which is converted into an electrical signal through a bridge circuit. The microprocessor 4 calculates the flow rate according to thermodynamic formulas such as King's law, thereby accurately monitoring and controlling the injection volume. Two groups of sealing rings 13 cooperate with the sealing plug 12 to form a double-layer sealing ring 13, preventing flipping during movement. The sealing ring 13 can prevent the liquid medicine from contacting the air, preventing the oxidation of the liquid medicine components, and at the same time preventing the mixing of air and liquid medicine caused by the shaking of the device, and has a good protective effect on the liquid medicine. The battery 3 provides the power required for the operation of the entire system. The microprocessor 4 monitors the entire infusion process, and the microcontroller controls the micro flow pump according to the requirements, extracts the specified liquid medicine from the medicine storage device and injects it into the user's body through the needle 7.

[0020] In summary, when the overall device is in use: When using a piezoelectric micropump syringe to inject drugs, the piezoelectric micropump 15 consists of a piezoelectric ceramic 17 and a substrate 16 that form an oscillator as the main component. When an alternating current signal is applied to the piezoelectric ceramic 17, due to the inverse piezoelectric effect, periodic stress will be generated in the piezoelectric ceramic 17, causing the oscillator to perform reciprocating motion at the same frequency as the electrical signal. Since the lower chamber of this device is a slit with a height of 30 μm, the vibration of the oscillator causes rapid changes in the gas flow rate and pressure within the narrow gap, thereby generating a pressure difference to drive the directional flow of the fluid. When the liquid medicine in the liquid storage device 11 is extracted, a negative pressure is generated in the liquid storage device 11, causing the sealing plug 12 to move along with the extraction of the liquid medicine, and the liquid medicine in the liquid storage device 11 can be stably injected into the user's body. It has high stability, a simple overall structure, convenient operation, and strong practicability.

[0021] When the liquid medicine is quantitatively injected, the flow rate is monitored by the first thermistor 18, the second thermistor 20 and the micro heater 19. The micro heater 19 heats up after being powered on, and the fluid takes away heat when flowing through, causing the temperature of the second thermistor 20 to change. The temperature change causes the resistance value to change, which is converted into an electrical signal through the bridge circuit. The microprocessor 4 calculates the flow rate according to thermodynamic formulas such as King's law, thereby accurately monitoring and controlling the injection volume.

[0022] When storing the medicine liquid, two groups of sealing rings 13 cooperate with the sealing plug 12 to form a double-layer sealing ring 13 to prevent it from turning over during movement. The sealing ring 13 can prevent the medicine liquid from contacting with the air, prevent the oxidation of the medicine liquid components, and prevent the mixing of air and medicine liquid caused by the shaking of the equipment. When the micropump draws away part of the medicine liquid from the lower part of the liquid reservoir 11, a negative pressure state will be present under the medicine reservoir. Due to the sealing effect of the sealing ring 13, the sealing plug 12 will move downward to balance the upper and lower pressures of the sealing ring 13, thereby better protecting the medicine liquid.

[0023] In all the schemes mentioned above, the connection between two parts can be selected according to actual conditions by welding, bolt and nut matching connection, bolt or screw connection or other well-known connection methods, which will not be described one by one here. In the above, all fixed connections are preferably welded. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A piezoelectric micropump syringe with a flow monitoring function, comprising a base (1) and a circuit board (2), the circuit board (2) being fixedly installed on the base (1), characterized in that: A battery (3) is clamped on the circuit board (2), a microprocessor (4) is fixedly installed on the circuit board (2), a mounting seat (5) is fixedly arranged on the circuit board (2), a micro flow control pump (6) is fixedly installed on the mounting seat (5), a needle (7) is fixedly arranged on the base (1), an output pipe (8) is arranged at the output end of the micro flow control pump (6) and is connected to the needle (7), a socket (9) and a card seat (10) are arranged on the base (1), a liquid reservoir (11) is inserted into the socket (9), a suction pipe is arranged on the socket (9) and is communicated with the liquid reservoir (11), and the end of the suction pipe is connected to the input end of the micro flow control pump (6).

2. The piezoelectric micropump syringe with a flow monitoring function according to claim 1, wherein: A liquid storage cavity is arranged inside the liquid reservoir (11), a sealing plug (12) is slidably arranged in the liquid storage cavity, and a sealing ring (13) is sleeved on the sealing plug (12).

3. The piezoelectric micropump syringe with a flow monitoring function according to claim 2, characterized in that: There are two groups of the sealing rings (13).

4. The piezoelectric micropump syringe with a flow monitoring function according to claim 1, characterized in that: A positioning head (14) is arranged on the liquid reservoir (11), a positioning groove is arranged on the card seat (10), and the positioning head (14) is clamped in the positioning groove.

5. A piezoelectric micropump syringe with a flow monitoring function according to claim 1, characterized in that: The micro flow control pump (6) is composed of a piezoelectric micro pump (15), a base (16), a piezoelectric ceramic (17), a first thermistor (18), a micro heater (19), a second thermistor (20) and a housing (21). The piezoelectric micro pump (15) is fixedly arranged in the housing (21), the base (16) and the piezoelectric ceramic (17) form an oscillator and are arranged in the piezoelectric micro pump (15), a pipeline is arranged in the housing (21) and is communicated with the piezoelectric micro pump (15), and the first thermistor (18), the micro heater (19) and the second thermistor (20) are arranged in sequence on the pipeline.

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