A method for eliminating bubble interference of a perfusion pump and a perfusion pump

Abstract

This invention relates to the field of medical devices, specifically a method for eliminating air bubble interference in an infusion pump and the infusion pump itself. The invention flushes the tubing with a high-flow-rate liquid. By identifying the voltage characteristics of air bubble monitoring during the flushing process, the air bubbles in the tubing are expelled while the air gap between the tubing and the mounting slot is eliminated, thus preventing interference from air gaps in the tubing. The tubing is then continuously monitored using a reference voltage after interference elimination, thereby achieving air bubble monitoring within the tubing. In subsequent use, an alarm or warning is issued upon detecting an air bubble, and the system re-enters the preparation phase. This effectively eliminates the influence of air gaps, enabling effective tubing monitoring and ensuring the safe use of the infusion pump.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and in particular to a method for eliminating air bubble interference in an infusion pump and an infusion pump. Background Technology

[0002] When a filling pump injects fluid, air may enter the pipeline, generating bubbles that affect the pump's efficiency. Therefore, the filling pump needs to detect and remove bubbles from the pipeline.

[0003] Current mainstream bubble detection methods, such as ultrasonic bubble detection technology, detect bubbles in pipes by measuring the penetration energy of ultrasonic waves. The pipe is filled with fluid, and the ultrasonic waves emitted by the generator are received by the receiver and converted into a voltage signal. When a bubble appears in the pipe, some of the ultrasonic energy is reflected or refracted by the bubble, resulting in a decrease in the received energy and a corresponding reduction in the output voltage signal. Therefore, the presence and size of a bubble can be determined by detecting the output voltage. In other words, existing bubble detection methods involve inserting a bubble detection device into the pipe. When there are no bubbles in the pipe, the detected voltage signal is A. When a standard bubble appears in the pipe, the voltage signal is B. Therefore, detecting voltage value B indicates the presence of a standard bubble in the pipe.

[0004] However, in practical use, if the pipeline is not installed properly when connected to the bubble detection device, the pipe and the tank may not fit completely, and the degree of fit may vary after each installation. This creates air gaps between the pipeline and the tank, preventing the bubble detection device from accurately detecting bubbles within the pipeline. Furthermore, it may mistakenly identify air gaps as bubbles within the pipeline, causing the filling pump to malfunction. This bubble detection method cannot distinguish between air gaps and bubbles within the pipeline, and therefore cannot effectively detect air gaps in the pipeline. Thus, a method for eliminating bubble interference in filling pumps that can effectively eliminate the interference from air gaps and bubbles is needed. Summary of the Invention

[0005] The purpose of this invention is to overcome the inability of existing technologies to effectively distinguish between air gaps and air bubbles, and to eliminate interference, by providing a method for eliminating air bubble interference in a filling pump and a filling pump.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0007] A method for eliminating air bubble interference in an injection pump includes the following steps:

[0008] S1: Install the pipeline into the slot of the bubble detection device inside the injection pump;

[0009] S2: The pipeline is flushed by the injection pump, and the voltage inside the pipeline is continuously monitored;

[0010] S3: After the voltage stabilizes within a preset time threshold, use the current voltage as the reference voltage and stop flushing;

[0011] S4: Continuously monitor the voltage within the pipeline. When the difference between the voltage and the reference voltage exceeds a preset voltage threshold, it is determined that a standard air bubble has appeared in the pipeline. The filling pump alarms to indicate the presence of air bubbles and proceeds to step S2. This invention introduces a high-flow-rate liquid to flush the pipeline. By identifying the voltage characteristics of the air bubble during the flushing process, the air bubbles in the pipeline are expelled while the air gap between the pipeline and the mounting groove is eliminated, thus eliminating interference from the air gap in the pipeline. The pipeline is then continuously monitored using the reference voltage after interference elimination, thereby achieving air bubble monitoring within the pipeline. In subsequent use, an alarm or warning is issued upon detecting an air bubble, and the process re-enters the preparation stage. This effectively eliminates the influence of air gaps, enabling effective pipeline monitoring and ensuring the safe operation of the filling pump.

[0012] As a preferred embodiment of the present invention, the preset voltage threshold is defined as: the voltage inside the pipeline when there are no bubbles - the voltage inside the pipeline when there are standard bubbles.

[0013] As a preferred embodiment of the present invention, step S1 further includes:

[0014] After the pipeline is installed, the slot is filled with an oily medium. This invention, by filling the slot of the injection pump with an oily medium, further eliminates interference from air gaps, effectively improving the accuracy of the detection.

[0015] As a preferred embodiment of the present invention, the grease-like medium is silicone oil or glycerin.

[0016] As a preferred embodiment of the present invention, the rinsing flow rate in step S2 is greater than or equal to 60 ml / min.

[0017] A filling pump, wherein the filling pump employs any of the above-described methods for eliminating air bubble interference in a filling pump.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. This invention uses a high-flow-rate liquid to flush the pipeline. By identifying the voltage characteristics of air bubbles during the flushing process, the liquid removes air bubbles from the pipeline while eliminating interference from air gaps between the pipeline and the mounting groove. The pipeline is then continuously monitored using a reference voltage after interference elimination, thus enabling the monitoring of air bubbles within the pipeline. In subsequent use, an alarm or warning is issued upon detecting air bubbles, and the system re-enters the preparation phase. This effectively eliminates the influence of air gaps, achieving effective pipeline monitoring and ensuring the safe operation of the injection pump.

[0020] 2. By filling the slot of the injection pump with an oily medium, the present invention further eliminates the interference of air gaps and effectively improves the accuracy of detection. Attached Figure Description

[0021] Figure 1 This is a schematic flowchart of a method for eliminating air bubble interference in an injection pump according to Embodiment 1 of the present invention;

[0022] Figure 2 This is a schematic diagram of the voltage change value when no medium is filled in the injection pump in the method for eliminating air bubble interference in the injection pump according to Embodiment 2 of the present invention;

[0023] Figure 3 This is a schematic diagram of the voltage change value after filling cutoff in a method for eliminating air bubble interference in an injection pump according to Embodiment 2 of the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of an injection pump according to Embodiment 3 of the present invention. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0026] Example 1

[0027] A method for eliminating air bubble interference in an injection pump includes the following steps:

[0028] S1: Install the pipeline into the slot of the bubble detection device inside the injection pump;

[0029] S2: The pipeline is flushed by the infusion pump, and the voltage inside the pipeline is continuously monitored; wherein the flushing flow rate is greater than or equal to 60 ml / min.

[0030] The purpose of selecting a higher flow rate is to distinguish between air bubbles and air gaps in the pipeline, allowing them to escape smoothly when present. At lower flow rates, such as less than 10 ml / min, air bubbles adhere to the inner wall of the pipe and cannot escape smoothly. Therefore, if air bubbles are present at the bubble detection location, we will be unable to distinguish between air bubbles inside the pipe and air gaps between the pipe and the tank.

[0031] S3: Analyze the detected voltage signal. When the voltage signal changes abruptly, it indicates that air bubbles have passed through the detection device. After the voltage stabilizes within a preset time threshold, it indicates that there are no air bubbles in the current pipeline. The current voltage is then used as the reference voltage, and flushing is stopped.

[0032] S4: Continuously monitor the voltage within the pipeline. When the difference between the voltage and the reference voltage exceeds a preset voltage threshold, it is determined that a standard air bubble has appeared in the pipeline. The injection pump alarms to indicate the presence of air bubbles, stops the injection pump, and re-enters step S2 for flushing. The preset voltage threshold is defined as: Pipeline voltage without air bubbles - Pipeline voltage with standard air bubbles. That is, the voltage signal detected when there are no air bubbles in the pipeline is A, the voltage signal when standard air bubbles appear in the pipeline is B, and the preset voltage threshold is AB. When the voltage change in the pipeline is greater than or equal to AB, it is determined that a standard air bubble has appeared in the pipeline, requiring re-flushing and resetting of the reference voltage. Step S4 can be implemented during use.

[0033] Example 2

[0034] The difference between this embodiment and Embodiment 1 is that step S1 further includes:

[0035] After the piping is installed, the slot is filled with an oily medium, such as silicone oil or glycerin. For example, silicone oil can fill the air gap between the piping and the slot. Figure 2 and Figure 3 The figures show the voltage change values ​​when the medium is not filled and the voltage change values ​​after the filling is cut off, respectively.

[0036] Example 3

[0037] like Figure 4 As shown, a filling pump employs a filling pump bubble interference elimination method as described in Example 1 or 2.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for eliminating air bubble interference in a filling pump, characterized in that, Includes the following steps: S1: Install the pipeline into the slot of the bubble detection device inside the injection pump; S2: The pipeline is flushed by the injection pump, and the voltage inside the pipeline is continuously monitored; S3: After the voltage stabilizes within a preset time threshold, use the current voltage as the reference voltage and stop flushing; S4: Continuously monitor the voltage in the pipeline. When the difference between the voltage and the reference voltage exceeds a preset voltage threshold, it is determined that a standard bubble has appeared in the pipeline. An alarm is triggered to indicate that there is a bubble, and the process proceeds to step S2. The preset voltage threshold is equal to the voltage inside the pipeline when there are no bubbles and the voltage inside the pipeline when there are standard bubbles.

2. The method for eliminating air bubble interference in a filling pump according to claim 1, characterized in that, Step S1 further includes: After the pipeline is installed, the slot is filled with an oily medium.

3. The method for eliminating air bubble interference in a filling pump according to claim 2, characterized in that, The oily medium is silicone oil or glycerin.

4. The method for eliminating air bubble interference in an injection pump according to claim 1, characterized in that, The rinsing flow rate in step S2 is greater than or equal to 60 ml / min.

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