Injection device with identification circuit

Abstract

The utility model relates to the field of injectors, in particular to an injection device with an identification circuit, which comprises a hemodialyzer panel, an injection structure and the identification circuit, the injection structure is correspondingly connected with the identification circuit, the injection structure is arranged on the outer side of the hemodialyzer panel, and the identification circuit is arranged on the outer side of the hemodialyzer panel. The recognition circuit is arranged on the inner side of the hemodialyzer panel and comprises a voltage follower and a single chip microcomputer, and the voltage follower is connected between the injection structure and the single chip microcomputer and used for detecting the pipe diameter of the injection structure; the problems that injection of trace liquid medicine in a hemodialyzer is not accurate, the cost of an existing sensor for detecting the diameter of an injector is too high, and the precision and the high cost of the injector cannot be balanced are solved. The effect of continuously injecting the trace liquid medicine is achieved, and the accuracy of injecting the trace liquid medicine can be improved through the injection structure and the recognition circuit.

Description

Technical Field

[0001] The utility model relates to the field of syringes, and more particularly to an injection device with an identification circuit. Background Art

[0002] With the gradual development of medical devices, micro-injection pumps, which can perform uniform micro-injections for a long time, have become an important tool in clinical medicine and medical research. In order to achieve the continuous injection of micro-drug solutions in the blood circulation of the hemodialyzer, setting up injection pumps in the hemodialyzer has become the first choice. However, how to ensure the injection accuracy of the set injection pump has become an important issue. For example, using software to control the injection accuracy will result in low fault tolerance of the instrument. The same software cannot be universally applicable to multiple brands of injection pumps. If hardware is used to control the injection accuracy, such as using a potentiometer, the cost of the injection pump is high.

[0003] In the above problem, in order to improve accuracy, the prior art syringe pump uses a high-precision CCD optical sensor to measure the diameter of the syringe before emitting pulses, and then calculates the step displacement based on the measured diameter. However, the cost of using a high-precision CCD optical sensor is too high. Therefore, considering the step-like characteristics of the syringe diameter, the CCD optical sensor for detecting the diameter is replaced. The replaced sensor converts the change in the size of the sliding resistance between the transmitting end and the receiving end into the change in the strength of the output voltage, and then the voltage output by the voltage follower is basically consistent with the input voltage, thereby improving the detection accuracy. Utility Model Content

[0004] The utility model aims to overcome at least one defect (shortcoming) of the above-mentioned prior art and provide an injection device with an identification circuit, which is used to solve the problems of inaccurate injection of trace liquid medicine in a hemodialyzer, high cost of existing sensors for detecting the diameter of syringes, and the inability to balance the accuracy and high cost of syringes.

[0005] The technical solution adopted by the utility model is an injection device with an identification circuit, including a hemodialyzer panel, which also includes an injection structure and an identification circuit. The injection structure is correspondingly connected to the identification circuit. The injection structure is arranged on the outside of the hemodialyzer panel, and the identification circuit is arranged on the inside of the hemodialyzer panel. The identification circuit includes a voltage follower and a single-chip microcomputer. The voltage follower is connected between the injection structure and the single-chip microcomputer and is used to detect the tube diameter of the injection structure.

[0006] It is beneficial to realize continuous injection of trace amounts of liquid medicine through the injection structure, to realize precise injection of the injection structure through the identification circuit, and to detect the precise tube diameter of the injection structure through the voltage follower, so as to calculate the precise injection amount of each push injection of 1 mm based on the full scale length on the fixed specification.

[0007] Furthermore, the voltage follower includes a tube diameter detection unit and an operational amplifier unit, wherein the tube diameter detection unit is used to detect the tube diameter of the injection structure in real time, and the operational amplifier unit is used for voltage following and isolating input and output.

[0008] It is beneficial to detect the diameter of the injection structure through the diameter detection unit; it is beneficial to follow the voltage of the detected signal through the operational amplifier unit to improve the accuracy of the measurement value; and the front and rear stage circuits are isolated through the operational amplifier unit to protect the input voltage of the single chip microcomputer from exceeding the input maximum value.

[0009] Furthermore, the tube diameter detection unit is a resistive displacement sensor, a buckle is provided on the hemodialyzer panel, the buckle includes a spring, the injection structure controls the expansion and contraction of the spring by changing the tube diameter, the resistive displacement sensor includes a paddle, the paddle is connected to the spring, and the spring drives the paddle to change its displacement by expansion and contraction.

[0010] It is beneficial to ensure that the injection structure does not move randomly when measuring the tube diameter through the press buckle, thereby achieving measurement accuracy; it is beneficial to achieve a continuous change relationship between the measured value and the output voltage through the paddle, thereby enhancing the accuracy of the tube diameter measurement value; it is beneficial to achieve a connection between the tube diameter change of the injection structure and the voltage change brought by the paddle through the spring.

[0011] Furthermore, one end of the resistive displacement sensor is connected to a power supply and the other end is grounded, the positive electrode of the operational amplifier unit is connected to the output end of the resistive displacement sensor, and the output end of the operational amplifier unit is connected to the input end of the single-chip microcomputer.

[0012] It is beneficial to avoid signal loss caused by low input impedance of the next stage due to high output impedance through the operational amplifier unit, while improving the driving capability, eliminating the mutual influence between them, and greatly improving the accuracy of the voltage measured by the single-chip microcomputer.

[0013] Furthermore, the diameter of the injection structure is inversely proportional to the voltage output by the resistive displacement sensor.

[0014] This is helpful to establish an intuitive connection between the change in the diameter of the injection structure and the change in the output voltage of the resistive displacement sensor, and is helpful to obtain a more accurate measurement value of the injection diameter.

[0015] Furthermore, the model of the resistive displacement sensor is RDC1047A03.

[0016] The linear sensor can be used to reduce the volume so as to be installed inside the hemodialyzer panel, thereby reducing the weight and volume of the hemodialyzer.

[0017] Furthermore, the buckle includes an arc surface portion, a sleeve portion and a hand-holding portion, the arc surface portion fits the curvature of the outer tube diameter of the injection structure, the sleeve portion is sleeved on the spring and reciprocates along the expansion and contraction direction of the spring, the hand-holding portion is connected between the arc panel and the sleeve, and the hand-holding portion is a long arc plate, and the length direction of the long arc plate is perpendicular to the radial direction of the tube diameter of the injection structure.

[0018] It is beneficial to closely fit the outer diameter of the injection structure through the arc surface part, so that the injection structure does not move randomly during the diameter measurement process, which leads to inaccurate measurement; it is beneficial to realize the connection between the buckle and the spring through the sleeve, so as to convert the different diameters of the injection structure on the buckle into the expansion and contraction changes of the spring; it is beneficial to make it easier for medical staff to grasp when changing the different diameters of the injection structure through the handhold.

[0019] Furthermore, the injection structure also includes a piston and a propulsion pump, and the propulsion pump is controlled by the instructions of the single-chip microcomputer to control the propulsion amount. The injection structure has an initial state and an injection state. In the initial state, the buckle is tightly attached to the outer side of the hemodialysis machine panel. In the injection state, the propulsion pump controls the piston to move at a uniform speed and in a small amount.

[0020] It is beneficial to achieve the effect of continuous injection of trace liquid medicine through the connection between the piston and the propulsion pump, and is beneficial to adapt to the changes of different drug demand states of medical staff through the different states of the injection structure.

[0021] Furthermore, the model of the operational amplifier unit is LM324.

[0022] This model is conducive to achieving true differential input, thereby improving anti-interference ability; this model is conducive to achieving short-circuit protection output, so that the circuit is also very stable when an external capacitive load is connected.

[0023] Furthermore, the model of the single chip microcomputer is STM32F103VET6.

[0024] It is beneficial to improve the flexibility of the microcontroller through the model's multi-functional memory interface and rich peripherals.

[0025] Compared with the prior art, the beneficial effects of the utility model are: it is conducive to the accurate measurement of the tube diameter of the injection structure through the identification circuit, so as to calculate the accurate injection amount of 1mm per push injection according to the full scale length on the fixed specification of the injection structure; it is conducive to the effect of continuous injection of trace liquid medicine through the injection structure and the propulsion pump, and it is conducive to providing the accuracy of injecting trace liquid medicine through the injection structure and the identification circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of the utility model.

[0027] Figure 2 It is a partially enlarged structural diagram of the utility model.

[0028] Figure 3 It is a partially enlarged structural diagram of the utility model.

[0029] Figure 4 This is the identification circuit connection diagram of the utility model.

[0030] Description of the symbols in the accompanying drawings: hemodialyzer panel 100 , buckle 110 , spring 111 , arc surface portion 112 , sleeve portion 113 , hand support portion 114 , paddle 120 , injection structure 200 , propulsion pump 210 , piston 220 . DETAILED DESCRIPTION

[0031] The drawings of the present invention are only used for illustrative purposes and cannot be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0032] Example

[0033] like Figure 1-4 As shown, this embodiment provides an injection device with an identification circuit, including a hemodialyzer panel 100, which also includes an injection structure 200 and an identification circuit, the injection structure 200 is correspondingly connected to the identification circuit, the injection structure 200 is arranged on the outside of the hemodialyzer panel 100, and the identification circuit is arranged on the inside of the hemodialyzer panel 100, the identification circuit includes a voltage follower and a single-chip microcomputer, the voltage follower is connected between the injection structure 200 and the single-chip microcomputer, and is used to detect the tube diameter of the injection structure 200.

[0034] In this embodiment, the hemodialyzer panel 100 is provided with a syringe for continuous micro-injection of liquid medicine, wherein the injection structure 200 is arranged on the outside of the hemodialyzer panel 100, and the identification circuit is arranged on the inside of the hemodialyzer panel 100, and the injection structure 200 is used to store and inject liquid medicine; the identification circuit is used to accurately measure the change in the tube diameter of the injection structure 200; the voltage follower is used to improve the accuracy of the measurement value; and the single-chip microcomputer is used to accurately control the injection amount of liquid medicine.

[0035] The voltage follower includes a tube diameter detection unit and an operational amplifier unit. The tube diameter detection unit is used to detect the tube diameter of the injection structure 200 in real time, and the operational amplifier unit is used for voltage following and isolating input and output.

[0036] In this embodiment, since the specification of the injection structure 200 has a step-wise characteristic, the measured value of the tube diameter detection unit will change only when the specification of the injection structure 200 is changed. When the injection structure 200 is installed as a syringe of a certain specification, the tube diameter detection unit sends the measured syringe diameter signal to the operational amplifier unit, and the operational amplifier unit transmits the measurement signal to the single-chip microcomputer without loss through voltage following.

[0037] The tube diameter detection unit is a resistive displacement sensor. A buckle 110 is provided on the hemodialyzer panel 100. The buckle 110 includes a spring 111. The injection structure 200 controls the expansion and contraction of the spring 111 by changing the tube diameter. The resistive displacement sensor includes a paddle 120. The paddle 120 is connected to the spring 111. The spring 111 drives the paddle 120 to change its displacement by expansion and contraction.

[0038] In this embodiment, the resistive displacement sensor is used to convert the tube diameter measurement signal into a voltage change; the buckle 110 is used to fix the injection structure 200 to avoid inaccurate measurement caused by deviation during the tube diameter measurement process. When medical staff need to replace the injection structure 200, they need to pull the buckle 110 outward and install the syringe in a direction perpendicular to the installation direction of the buckle 110. As the buckle 110 is pulled out, the spring 111 is extended, and the paddle 120 on the resistive displacement sensor is displaced accordingly, and the output voltage of the resistive displacement sensor changes; after the replacement is completed, the buckle 110 is pulled outward again, and after the syringe is taken out, the buckle 110 is tightly attached to the outer surface of the hemodialyzer panel 100, the spring 111 is not extended, and the resistive displacement sensor has no voltage output.

[0039] One end of the resistive displacement sensor is connected to a power supply and the other end is grounded. The positive electrode of the operational amplifier unit is connected to the output end of the resistive displacement sensor. The output end of the operational amplifier unit is connected to the input end of the single chip microcomputer.

[0040] In this embodiment, the resistive displacement sensor is similar to a sliding resistor, and the injection propulsion volume and propulsion speed of the injection structure 200 depend on the diameter specification of the injection structure 200 and the scale length of the injection structure 200 under this specification. The resistive displacement sensor establishes a connection between the diameter measurement value and the output voltage, and the operational amplifier unit transmits the output voltage to the single-chip microcomputer. The single-chip microcomputer obtains a lossless diameter measurement signal according to the voltage change, and after identifying the diameter measurement signal, confirms the specification of the injection structure 200, thereby obtaining the ratio relationship between the injection volume and the propulsion displacement. In this embodiment, when the specification of the syringe is 50ml, its full scale length is 75.2mm, so the injection volume for every 1mm of propulsion is 0.66489ml.

[0041] The diameter of the injection structure 200 is inversely proportional to the voltage output by the resistive displacement sensor.

[0042] In this embodiment, when the diameter of the injection structure 200 is smaller, the deformation of the spring 111 is smaller, the resistance of the spring 111 driving the paddle 120 to connect to the circuit is smaller, and the voltage output by the resistive displacement sensor is larger; vice versa.

[0043] The model of the resistive displacement sensor is RDC1047A03.

[0044] In this embodiment, the total resistance value of the resistive displacement sensor model RDC1047A03 should measure the resistance value between resistor terminals 1 and 3, and the calculation formula for its rated voltage is: E is the rated voltage (V), P is the rated power (W), and R is the nominal total resistance value (Ω). When the calculated rated voltage exceeds the maximum operating voltage, the maximum operating voltage is used as the rated voltage. The size of this model is 6.9×56.5×3.0mm, the rod length is 4.4mm, and the terminal length is 2mm.

[0045] The buckle 110 includes an arc surface portion 112, a sleeve portion 113 and a hand-holding portion 114, the arc surface portion 112 fits the curvature of the outer tube diameter of the injection structure 200, the sleeve portion 113 is sleeved on the spring 111 and reciprocates along the expansion and contraction direction of the spring 111, the hand-holding portion 114 is connected between the arc panel and the sleeve, and the hand-holding portion 114 is a long arc plate, and the length direction of the long arc plate is perpendicular to the radial direction of the tube diameter of the injection structure 200.

[0046] In this embodiment, when the medical staff needs to replace the injection structure 200, they need to grasp the injection structure 200 through the long arc plate formed by the handhold portion 114 and pull the injection structure 200 outward; the curvature of the arc surface portion 112 forms a fitting surface with the injection structures 200 of different specifications and different diameters, so that the injection structure 200 does not shift after installation; one end of the sleeve portion 113 is connected to the spring 111, so that when the injection structure 200 is pulled out, the sleeve portion 113 is also pulled outward, and the other end of the sleeve portion 113 is connected to the arc surface portion 112, so that the distance between the arc surface portion 112 and the resistive displacement sensor is a constant value, so that the diameter change value of the injection structure 200 is the displacement change value of the paddle 120 driven by the spring 111.

[0047] The injection structure 200 also includes a piston 220 and a propulsion pump 210. The propulsion pump 210 is controlled by the instructions of the single-chip microcomputer to control the propulsion amount. The injection structure 200 has an initial state and an injection state. In the initial state, the buckle 110 is tightly attached to the outer side of the hemodialyzer panel 100. In the injection state, the propulsion pump 210 controls the piston 220 to move at a uniform speed and in a small amount.

[0048] In this embodiment, when the injection structure 200 is in the injection state, the propulsion pump 210 is started, driving the external gear to rotate, the gear drives the screw to rotate, and the screw links the piston 220, so that the piston 220 is pushed forward at a uniform speed along the syringe; when the injection is completed or it is necessary to replace the injection structure 200 of other specifications for the next injection, it is necessary to stop the propulsion pump 210 and take out the injection structure 200 set on the buckle 110. At this time, the injection structure 200 returns to its initial state, and the buckle 110 is tightly attached to the outer side of the hemodialyzer panel 100.

[0049] The model of the operational amplifier unit is LM324.

[0050] In this embodiment, this model of operational amplifier unit is a four-way operational amplifier, which is composed of four high-gain amplifiers and has a true differential input. When this model of operational amplifier is used as a voltage follower, it can follow the input voltage almost by one times, and has a high input impedance, which can reach several megohms, while the output impedance is low, usually only a few ohms.

[0051] The model of the single chip microcomputer is STM32F103VET6.

[0052] In this embodiment, this model of single-chip microcomputer adopts a 100-pin LQFP package and supports LFBGA packaging to adapt to different pin differences; this model of single-chip microcomputer has 512KB of Flash memory and 64KB of SRAM memory to achieve storage of more data; it has multiple peripheral resources, including 8 timers, 3 ADCs (supporting 16 channels), 2 DACs, 2 I2C interfaces, 5 USART interfaces, 3 SPI interfaces, 2 IIS interfaces, 2 CAN interfaces, 1 USB interface, 1 SDIO interface, and 1 LCD interface to meet various application requirements.

[0053] Obviously, the above embodiments of the utility model are only examples for clearly explaining the technical solution of the utility model, and are not intended to limit the specific implementation methods of the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the utility model shall be included in the protection scope of the claims of the utility model.

Claims

1. An injection device with an identification circuit, comprising a hemodialyzer panel, characterized in that: It also includes an injection structure and an identification circuit, the injection structure is correspondingly connected to the identification circuit, the injection structure is arranged on the outside of the hemodialyzer panel, and the identification circuit is arranged on the inside of the hemodialyzer panel. The identification circuit includes a voltage follower and a single-chip microcomputer, and the voltage follower is connected between the injection structure and the single-chip microcomputer to detect the tube diameter of the injection structure.

2. An injection device with an identification circuit according to claim 1, characterized in that: The voltage follower includes a tube diameter detection unit and an operational amplifier unit. The tube diameter detection unit is used to detect the tube diameter of the injection structure in real time, and the operational amplifier unit is used for voltage following and isolating input and output.

3. An injection device with an identification circuit according to claim 2, characterized in that: The tube diameter detection unit is a resistive displacement sensor. A buckle is provided on the hemodialyzer panel. The buckle includes a spring. The injection structure controls the expansion and contraction of the spring by changing the tube diameter. The resistive displacement sensor includes a paddle connected to the spring. The spring drives the paddle to change its displacement by expansion and contraction.

4. An injection device with an identification circuit according to claim 3, characterized in that: One end of the resistive displacement sensor is connected to a power supply and the other end is grounded. The positive electrode of the operational amplifier unit is connected to the output end of the resistive displacement sensor. The output end of the operational amplifier unit is connected to the input end of the single chip microcomputer.

5. An injection device with an identification circuit according to claim 4, characterized in that: The diameter of the injection structure is inversely proportional to the voltage output by the resistive displacement sensor.

6. An injection device with an identification circuit according to claim 5, characterized in that: The model of the resistive displacement sensor is RDC1047A03.

7. An injection device with an identification circuit according to any one of claims 3 to 6, characterized in that: The buckle includes an arc surface portion, a sleeve portion and a hand-holding portion, the arc surface portion fits the curvature of the outer tube diameter of the injection structure, the sleeve portion is sleeved on the spring and reciprocates along the expansion and contraction direction of the spring, the hand-holding portion is connected between the arc surface portion and the sleeve portion, and the hand-holding portion is a long arc plate, and the length direction of the long arc plate is perpendicular to the radial direction of the tube diameter of the injection structure.

8. An injection device with an identification circuit according to claim 7, characterized in that: The injection structure also includes a piston and a propulsion pump. The propulsion pump is controlled by the instructions of the single-chip microcomputer to control the propulsion amount. The injection structure has an initial state and an injection state. In the initial state, the buckle is tightly attached to the outer side of the hemodialysis machine panel. In the injection state, the propulsion pump controls the piston to move at a uniform speed and in a small amount.

9. An injection device with an identification circuit according to claim 8, characterized in that: The model of the operational amplifier unit is LM324.

10. An injection device with an identification circuit according to claim 8, characterized in that: The model of the single chip microcomputer is STM32F103VET6.

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