A calibration tool, calibration method and syringe residual volume detection method

Abstract

The present application is suitable for the technical field of medical equipment, and provides a calibration tool, a calibration method and a syringe residual liquid detection method. The calibration tool is applied to a syringe pump and comprises a positioning part used for fixed connection with the syringe pump, the positioning part is in a cylindrical shape, and an extension part with a fixed length is extended from one end of the positioning part. By setting the calibration tool, the offset position of the syringe push handle is calibrated by using the calibration tool. For any specification of syringe, when the syringe is installed on the syringe pump, the emptying distance of the syringe is determined by using the calibrated offset position of the tool, the data accuracy is high, the residual amount of the injection in the syringe can be detected in real time, the accuracy is high, and the injection accuracy and injection time are better ensured.

Description

Technical Field

[0001] This invention belongs to the field of medical equipment technology, and particularly relates to a calibration fixture, a calibration method for syringe plunger offset position, and a method for residual liquid detection. Background Technology

[0002] In many cases, it is necessary to precisely inject the medication into the patient's body during drug administration, such as blood transfusions and pain medication injections. An infusion pump is an intelligent infusion device that automatically injects medication by pushing a syringe plunger. It uses mechanical force to accurately control the number of drops or the infusion flow rate. Infusion pumps allow for precise control of the infusion rate and volume, and are widely used in clinical practice.

[0003] During injection using a syringe pump, even at the same set speed, different syringe brands or specifications have varying motor speeds. Therefore, precise data is required for the parameters of each brand and specification of syringe. It's possible to manually measure the syringe's outer diameter, plunger length, and scale length, and save the data to the syringe pump. However, manual measurement has a significant margin of error. Users unfamiliar with the parameters of syringe brands may experience difficulties with automatic measurement or significant measurement deviations, potentially leading to inaccuracies in injection accuracy or timing. Summary of the Invention

[0004] This invention provides a method for detecting residual liquid in a syringe, aiming to solve the problem that manual measurement of syringe parameters for syringes of different specifications has large errors, leading to deviations in injection accuracy or injection time.

[0005] The present invention is implemented as follows: a calibration fixture, characterized in that it is applied to an injection pump and includes: A positioning part, used for fixed connection with the injection pump, wherein the positioning part is cylindrical; and A protrusion of fixed length extends from one end of the positioning part.

[0006] This invention also provides a calibration method for the offset position of a syringe plunger, applied to an injection pump. The injection pump includes a trigger sensor located at a first trigger position on the plunger's movement path, and a pressure sensor located on the injection pump push block that can contact the syringe plunger. When the pressure value of the pressure sensor reaches the syringe emptying threshold, the pressure sensor emits a cutoff signal. The calibration method for the syringe plunger offset position includes: With the calibration fixture installed, the first trigger signal when the push rod passes the trigger sensor and the first cutoff signal emitted by the pressure sensor are acquired sequentially. The first distance traveled by the push rod is determined based on the first trigger signal and the first cutoff signal; With the syringe to be calibrated installed, the second trigger signal when the plunger passes the trigger sensor and the second cutoff signal emitted by the pressure sensor are acquired sequentially. The second distance traveled by the push rod is determined based on the second trigger signal and the second cutoff signal; The first and second distances determine the length by which the syringe plunger extends beyond the syringe barrel when the syringe is emptied.

[0007] Alternatively, the length by which the syringe plunger extends beyond the syringe barrel when the syringe is emptied can be determined by the following formula: in, For the extended length, To calibrate the length of the tooling protrusion, The second distance, This is the first distance.

[0008] Optionally, when the calibration fixture is installed, a first trigger signal when the plunger passes the trigger sensor and a first cutoff signal emitted by the pressure sensor are acquired sequentially; a first distance traveled by the plunger is determined based on the first trigger signal and the first cutoff signal; when the syringe to be calibrated is installed, a second trigger signal when the plunger passes the trigger sensor and a second cutoff signal emitted by the pressure sensor are acquired sequentially; a second distance traveled by the plunger is determined based on the second trigger signal and the second cutoff signal, including: With the calibration fixture installed, acquire the first trigger signal when the push rod passes the trigger sensor; Then, the first cutoff signal emitted by the pressure sensor is acquired; Obtain the first number of motor rotations between the first trigger signal and the first cutoff signal; Based on the first number of rotations, determine the first distance traveled by the push rod when the first cutoff signal is detected; With the syringe installed, acquire the second trigger signal when the plunger passes the trigger sensor; Then, the second cutoff signal emitted by the pressure sensor is acquired; Obtain the second number of motor rotations between the second trigger signal and the second cutoff signal; Based on the second number of rotations, determine the second distance traveled by the injection pump push rod when the second cutoff signal is detected.

[0009] This invention also provides a method for detecting residual liquid in a syringe, characterized in that it includes: Acquire the third trigger signal when the push rod passes the position sensor; Obtain the third distance from the position sensor to the extreme position of the push rod; Obtain the fourth distance from the trigger sensor to the extreme position of the push rod; Obtain the third number of motor rotations after the third trigger signal is detected; Based on the third distance, the fourth distance, the third number of rotations, and the extension length and first distance determined in claim 2, the first emptying distance of the syringe plunger when the plunger passes the position sensor is determined; Based on the third number of rotations and the first emptying distance, determine the second emptying distance of the syringe plunger when it reaches any position after passing the position sensor.

[0010] Alternatively, the second emptying distance can be determined by the following formula: in, The third distance, The fourth distance, To calibrate the length of the tooling protrusion, For the extended length, The first distance, This represents the third rotation of the motor when the push rod reaches any position after passing the position sensor. This refers to the distance the push rod moves when the motor rotates one revolution.

[0011] This invention also provides a calibration device for the offset position of a syringe plunger, characterized in that it includes: The first receiving module is used to sequentially acquire the first trigger signal and the first cutoff signal; The first ranging module is used to determine the first distance traveled by the push rod based on the first trigger signal and the first cutoff signal; The second receiving module is used to sequentially acquire the second trigger signal and the second cutoff signal; The second ranging module is used to determine the second distance traveled by the push rod based on the second trigger signal and the second cutoff signal; The first calculation module is used to determine the extension length of the syringe plunger beyond the syringe barrel when the syringe is emptied, based on the first distance and the second distance.

[0012] This invention also provides a syringe residual liquid detection device, characterized in that it includes: The third receiving module is used to acquire the third trigger signal when the push rod passes the position sensor; The third ranging module is used to obtain the third distance from the position sensor to the extreme position of the push rod; The fourth ranging module is used to obtain the fourth distance from the trigger sensor to the extreme position of the push rod; The counting module is used to obtain the third number of rotations of the motor after the third trigger signal is detected; The second calculation module is used to determine the first emptying distance of the syringe plunger when the plunger passes the position sensor, based on the third distance, the fourth distance, the third number of rotations, the extension length determined above, and the first distance. The third calculation module is used to determine the second emptying distance of the syringe plunger when the plunger reaches any position after passing the position sensor, based on the third number of rotations and the first emptying distance.

[0013] This invention also provides an infusion pump, characterized in that it comprises: A trigger sensor is installed on the movement path of the syringe pump push handle to trigger a first trigger signal or a second trigger signal; A position sensor is installed on the movement path of the syringe pump push handle to trigger a third trigger signal; A counting device used to obtain the number of rotations of the motor shaft; A pressure sensor installed on the push block is used to trigger a first cutoff signal or a second cutoff signal when the pressure sensed by the pressure sensor reaches a preset value. A processor, which is communicatively connected to a trigger sensor, a position sensor, a counting device, and a pressure sensor, respectively; and The memory is used to store computer programs, and the processor is used to execute the computer programs to implement the above-described syringe plunger offset position calibration method or the above-described syringe residual liquid detection method.

[0014] This invention also provides a storage medium storing program instructions for executing the above-described syringe plunger offset position calibration method or the above-described syringe residual liquid detection method.

[0015] The beneficial effects achieved by this invention are due to the use of a calibration fixture to calibrate the offset position of the syringe plunger. For any size syringe, after the syringe is installed on the injection pump, the ejection distance of the syringe is determined using the offset position calibrated by the fixture. This results in high data accuracy, allowing for real-time detection of the remaining amount of syringe solution with high accuracy, thus better ensuring injection precision and injection time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the calibration fixture provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of the injection pump provided in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the syringe provided in Embodiment 1 of the present invention; Figure 4This is a schematic diagram of the first positional relationship provided in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the second positional relationship provided in Embodiment 1 of the present invention; Figure 6 This is a flowchart provided in Embodiment 2 of the present invention; Figure 7 This is a flowchart provided in Embodiment 3 of the present invention; Figure 8 This is a flowchart provided in Embodiment 5 of the present invention; Figure 9 This is a schematic diagram of the calibration device for the offset position of the syringe plunger provided in Embodiment 7 of the present invention; Figure 10 This is a schematic diagram of the syringe residual liquid detection device provided in Embodiment 8 of the present invention; Figure 11 This is a schematic diagram of the structure of the injection pump provided in Embodiment 9 of the present invention.

[0017] Figure label: 100. Calibration fixture; 110. Positioning part; 120. Extension part; 200. Injection pump; 210. Push rod; 220. Trigger sensor; 230. Push block; 240. Pressure sensor; 250. Position sensor; 260. Fixing structure; 270. Extreme position; 280. Mounting plane; 290. Processor; 2110. Memory; 300. Syringe; 310. Needle; 320. Push handle; 400. Calibration device for syringe plunger offset position; 410. First receiving module; 420. First ranging module; 430. Second receiving module; 440. Second ranging module; 450. First calculation module; 500. Syringe residual liquid detection device; 510. Third receiving module; 520. Third ranging module; 530. Fourth ranging module; 540. Counting module; 550. Second calculation module; 560. Third calculation module; A. When the push block contacts the protruding part of the calibration fixture while the calibration fixture is installed; B. When the plunger passes the trigger sensor while the syringe to be calibrated is installed; C. When the syringe is emptied while the syringe to be calibrated is installed; D. When the syringe to be calibrated is installed, the plunger passes the position sensor. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the invention, and should not be construed as limiting the invention. Furthermore, it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0019] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0024] This invention utilizes a calibration fixture to calibrate the offset position of the syringe plunger. For any syringe size, once the syringe is installed on the injection pump, the calibrated offset position is used to determine the syringe's emptying distance. This provides high data accuracy, allows for real-time monitoring of the remaining syringe volume, and ensures better injection precision and timing.

[0025] Example 1 like Figure 1 As shown, this embodiment provides a calibration fixture 100, applied to an injection pump 200, comprising: Positioning part 110, used for fixed connection with injection pump, is cylindrical and has a limiting structure; and A length-fixed extension 120 extending from one end of the positioning part 110.

[0026] The infusion pump 200 is used to replace manual operation, pushing the injection solution in the syringe 300 into the patient's body. The infusion pump 200 includes a body, a plunger 210, and a pusher block 230 connected to the plunger 210. The plunger 210 drives the pusher head to move relative to the body. The syringe barrel 310 of the syringe 300 is fixedly mounted on the body, and the plunger handle 320 of the syringe 300 faces the pusher block 230. When the pusher block 230 moves towards the syringe 300 under the action of the plunger 210, the pusher block 230 pushes the plunger handle 320, pushing the injection solution out of the syringe barrel 310.

[0027] The positioning part 110 of the calibration fixture 100 is similar to the syringe barrel 310 of the syringe 300 and is fixedly mounted on the machine body. The extension part 120 of the calibration fixture 100 is similar to the plunger 320 of the syringe 300. When mounted on the injection pump 200, it needs to face the push block 230. The difference between the extension part 120 and the plunger 320 of the syringe 300 is that the extension part 120 cannot move relative to the fixed part. The calibration fixture 100 as a whole is similar to a syringe 300 in which the plunger 320 and the syringe barrel 310 are fixedly connected.

[0028] Since the protruding part 120 cannot move relative to the fixed part, and the length of the protruding part 120 is fixed, the length of the protruding part 120 extending beyond the fixed part is a fixed value, which can be denoted as... .

[0029] Example 2 This embodiment provides a method for calibrating the offset position of the plunger 320 of a syringe 300. The method is characterized by being applied to an injection pump. The injection pump includes a trigger sensor 220 located at a first trigger position on the movement path of the plunger 210, and a pressure sensor 250 located on the injection pump push block 230 that can contact the injection plunger 320. When the pressure value of the pressure sensor 250 reaches the emptying threshold of the syringe 300, the pressure sensor 250 sends a cut-off signal. like Figure 6 The diagram shown is a flowchart illustrating a method for calibrating the offset position of the plunger 320 of a syringe 300 according to an embodiment of the present invention. The method includes the following steps: S101. With the calibration fixture 100 installed, the first trigger signal when the push rod 210 passes the trigger sensor 220 and the first cutoff signal emitted by the pressure sensor 250 are acquired sequentially. S102. Determine the first distance traveled by the push rod 210 based on the first trigger signal and the first cutoff signal; S103. With the syringe 300 to be calibrated installed, the second trigger signal when the plunger 210 passes the trigger sensor 220 and the second cut-off signal emitted by the pressure sensor 250 are acquired sequentially. S104. Determine the second distance traveled by the push rod 210 based on the second trigger signal and the second cutoff signal; S105. Determine the extension length of the plunger 320 of the syringe 300 beyond the extension length of the syringe barrel 310 when the syringe 300 is emptied, based on the first distance and the second distance.

[0030] S101 and S102 have a strict sequential requirement: S101 must be performed before S102. S103 and S104 also have a strict sequential requirement: S103 must be performed before S104 in order to enable the method of calibrating the offset position of the plunger 320 of the syringe 300 to function.

[0031] Specifically, with the calibration fixture 100 installed, it is necessary to sequentially acquire the first trigger signal when the push rod 210 passes the trigger sensor 220 and the first cutoff signal emitted by the pressure sensor 250. First, by monitoring the position of the push rod 210, the first trigger signal is recorded when it passes the trigger sensor 220. Simultaneously, the pressure change in the syringe or liquid delivery system is monitored by the pressure sensor 250, and the first cutoff signal is also recorded.

[0032] The first distance traveled by the push rod 210 can be determined based on the first trigger signal and the first cutoff signal. Specifically, the first distance can be determined by a distance sensor, or by installing an angle sensor on the motor to determine the motor's rotation angle, obtain the number of motor rotations, and then determine the first distance. Alternatively, blades can be installed on the motor shaft, and each time the blade passes the photoelectric sensor, a record is made, and the number of motor rotations is obtained by counting the number of times the blade passes the photoelectric sensor, thus determining the first distance. Other methods can also be used to determine the distance using a trigger signal and a cutoff signal, which are not limited here.

[0033] With the syringe 300 to be calibrated installed, it is necessary to sequentially acquire the second trigger signal when the plunger 210 passes the trigger sensor 220 and the second cutoff signal emitted by the pressure sensor 250. Similarly, by monitoring the position of the plunger 210, the second trigger signal is recorded when it passes the trigger sensor 220. At the same time, the pressure change in the syringe or liquid delivery system is monitored by the pressure sensor 250, and the second cutoff signal is recorded when the pressure sensor emits it.

[0034] The second distance traveled by the push rod 210 can be determined based on the second trigger signal and the second cutoff signal. The second distance can be calculated and determined in various ways; see the determination of the first distance for details.

[0035] Based on the first and second distances, the extension length of the plunger 320 of the syringe 300 beyond the syringe barrel 310 when the syringe 300 is emptied can be determined. By comparing the first and second distances, and considering the characteristics and structure of the syringe 300, the extension length of the plunger 320 within the syringe barrel 310 can be calculated; that is, the length of the plunger 320 extending beyond the syringe barrel 310 when the plunger 320 of the syringe 300 contacts the bottom of the syringe barrel 310.

[0036] like Figure 2 and 3 As shown, in this embodiment, the trigger sensor 220 is installed on the movement path of the push rod 210. When the push rod 210 passes the trigger sensor 220, the trigger sensor 220 is triggered and sends a trigger signal. The syringe pump push block 230 is provided with a pressure sensor 250 that can contact the syringe plunger 320. The pressure sensor 250 is provided with a venting threshold. When the pressure of the pressure sensor 250 reaches the venting threshold, the pressure sensor 250 sends a cut-off signal.

[0037] Understandably, to ensure the proper installation position of the syringe 300, a fixing structure 260 is provided on the syringe pump 200 to fix the syringe 300. The fixing structure 260 ensures that the end of the syringe 300 connected to the plunger 320 is positioned on a fixed mounting plane 280. The fixing part of the calibration fixture 100 extends from the end face of the protrusion 120 and is positioned on the mounting plane 280 after installation.

[0038] The emptying threshold is the pressure value of the pressure sensor 250 when the syringe 300 is emptied, i.e., when the plunger 320 and the bottom of the syringe 310 are in contact, and the plunger 320 is blocked and cannot be pushed any further. The emptying threshold can be determined experimentally and adjusted based on experimental data.

[0039] like Figure 4 As shown, when the calibration fixture 100 is installed, the positioning part 110 of the calibration fixture 100 is fixedly mounted on the body of the injection pump 200, and one end of the protrusion 120 faces the push block 230. Since the protrusion 120 is fixedly connected to the positioning part 110, the protrusion 120 cannot move relative to the fixed part, similar to the state when the syringe 300 is emptied and the bottom of the plunger 320 and the syringe 310 are in contact.

[0040] When the injection pump 200 is turned on, the pusher block 230 moves towards the machine body under the action of the push rod 210. When the push rod 210 passes the trigger sensor 220, the trigger sensor 220 sends out the first trigger signal. As the pusher block 230 continues to move, it contacts the extension 120 of the calibration fixture 100. The pressure sensor 250 senses the pressure between the push handle 320 and the pusher block 230. When the pressure value sensed by the pressure sensor 250 reaches the venting threshold, the pressure sensor 250 triggers the first cutoff signal.

[0041] When the syringe 300 is installed, the syringe barrel 310 of the syringe 300 is fixedly installed on the body of the injection pump 200, and the plunger 320 of the syringe 300 faces the plunger 230.

[0042] When the infusion pump 200 is turned on, the plunger 230 moves towards the machine body under the action of the plunger 210. When the plunger 210 passes the trigger sensor 220, the trigger sensor 220 sends out the first trigger signal. As the plunger 230 continues to move, it contacts the plunger handle 320, and the pressure sensor 250 senses the pressure between the plunger handle 320 and the plunger 230. The plunger 230 moves the plunger handle 320 together. Before the plunger handle 320 reaches the bottom of the syringe 310, the plunger 210 only needs to overcome the friction between the plunger handle 320 and the syringe 310 and the resistance of the injection to push the plunger handle 320. At this time, the pressure value sensed by the pressure sensor 250 is less than the emptying threshold. As the plunger 230 continues to push the plunger handle 320 until the plunger handle 320 contacts the bottom of the syringe 310, the pressure value sensed by the pressure sensor 250 reaches the emptying threshold, and the pressure sensor 250 triggers the first cutoff signal.

[0043] Based on the first and second distances, the first offset distance at the end of the push rod 210 when the cutoff signal is triggered under the conditions of installing the calibration fixture 100 and installing the syringe 300 can be calculated. The distance between the end of the protrusion 120 of the calibration fixture 100 away from the positioning part 110 when the calibration fixture 100 is installed and the end of the plunger 320 of the syringe 300 away from the syringe barrel 310 when the syringe is emptied is the second offset distance. The first offset distance and the second offset distance are equal. The length of the protrusion 120 of the calibration fixture 100 minus the second offset distance is the extension length of the syringe plunger 320 of the syringe 300 extending out of the syringe barrel 310 when the syringe 300 is emptied. .

[0044] Substitute into the formula: Right now: in, To calibrate the length of the protrusion 120 of tooling 100, The second distance, This is the first distance.

[0045] Understandably, the second distance is the distance traveled by the push rod 210 between the second trigger signal and the second cutoff signal. The distance that the push handle 320 moves with the push rod 210 under the action of the push block 230 is also the second distance. When the second cutoff signal is issued, the push handle 320 contacts the bottom of the syringe 310. Therefore, when the second trigger signal is triggered, the distance from the syringe 300 push handle 320 to the bottom of the syringe 310 is equal to the second distance.

[0046] Example 3 like Figure 7 The diagram shown is a flowchart illustrating a method for calibrating the offset position of the plunger 320 of a syringe 300 according to an embodiment of the present invention. Step S102 includes steps S1021 and S1022, and step S104 includes steps S1041 and S1042. The method includes the following steps: S101: Sequentially acquire the first trigger signal when the push rod 210 passes the trigger sensor and the first cutoff signal emitted by the pressure sensor; S1021. Obtain the first number of motor rotations between the first trigger signal and the first cutoff signal; S1022. Based on the first number of rotations, determine the first distance traveled by the push rod 210 when the first cutoff signal is detected; S103. With the syringe 300 installed, sequentially acquire the second trigger signal when the plunger 210 passes the trigger sensor and the second cutoff signal emitted by the pressure sensor. S1041. Obtain the second number of motor rotations between the second trigger signal and the second cutoff signal; S1042. Based on the second number of rotations, determine the second distance traveled by the injection pump push rod 210 when the second cutoff signal is detected; S105. Determine the extension length of the plunger 320 of the syringe 300 beyond the extension length of the syringe barrel 310 when the syringe 300 is emptied, based on the first distance and the second distance.

[0047] Specifically, it is necessary to obtain the first number of motor rotations between the first trigger signal and the first cutoff signal. Typically, a position sensor is connected to the motor and can obtain the number of rotations by monitoring the motor's rotation. This can be achieved using an encoder or other position feedback device.

[0048] The specific operation involves recording the motor's rotation after the first trigger signal appears, continuing until the first cutoff signal appears. The number of motor rotations can be calculated based on the encoder pulse count or the count value from other position feedback devices.

[0049] Based on the first number of rotations, the first distance traveled by the push rod 210 when the first cutoff signal is detected can be determined. The push rod 210 is driven by a motor; the distance the push rod 210 travels with one rotation of the motor is a fixed value, which can be denoted as... x The specific value of this determination is determined by the specific structure between the motor and the push rod 210. Understandably, a conversion structure is set between the motor and the push rod 210 to convert the angular displacement of the motor's rotation into a linear displacement along the axis of the push rod 210, so that the push rod 210 does not rotate with the motor.

[0050] For example, if each motor rotation corresponds to a push rod moving 10 centimeters, and the first motor rotates 3 times, then the first distance traveled by push rod 210 can be determined to be 30 centimeters. Through such calculation, the displacement of push rod 210 can be determined based on the number of motor rotations.

[0051] The process of determining the second distance is similar to that of determining the first distance, and will not be described in detail here.

[0052] In some embodiments, blades are mounted on the motor shaft, and a photoelectric counter is positioned on the side of the motor shaft along the rotational path of the blades. Each time a blade passes the photoelectric counter, a count is performed, and the number of motor revolutions is determined by the number of times the blade passes the photoelectric counter.

[0053] A photoelectric counter is an automatic counting device made using photoelectric components. Infrared photoelectric counters are divided into two types: infrared light-blocking counters and infrared reflection counters. The infrared light-blocking counter works by having infrared light emitted from an infrared LED shine directly onto a photoelectric component (such as a phototube or photoresistor). Each time the infrared light is blocked, the operating state of the photoelectric component changes. An amplifier records the number of times the light is blocked. The infrared reflection counter works by having infrared light emitted from an infrared LED reflected onto a photoelectric component. Each time the infrared light is reflected and received, the operating state of the photoelectric component changes. An amplifier records the number of times the light is reflected and received.

[0054] Specifically, with the calibration fixture 100 installed, when the trigger sensor 220 sends the first trigger signal, the photoelectric counter starts counting; when the pressure sensor 250 sends the first cutoff signal, the photoelectric counter stops counting. At this point, the photoelectric counter count is... The first distance is then calculated using the following formula: in, The first distance, The number of the first rotations of the motor between the first trigger signal and the first cutoff signal. This refers to the distance that the push rod 210 moves when the motor rotates one revolution.

[0055] With syringe 300 installed, when trigger sensor 220 sends a second trigger signal, the photoelectric counter starts counting. When pressure sensor 250 sends a second cutoff signal, the photoelectric counter stops counting. At this time, the photoelectric counter count is... The second distance is then calculated using the following formula: in, For the second distance, The second number of rotations of the motor between the second trigger signal and the second cutoff signal. This refers to the distance that the push rod 210 moves when the motor rotates one revolution.

[0056] The number of motor rotations is obtained by a photoelectric counter, which is used to calculate the distance traveled by the push rod 210. The counting is accurate and intuitive, and the calculated distance data is highly accurate.

[0057] Example 4 like Figure 8 The diagram shown is a flowchart illustrating a method for calibrating the offset position of the plunger 320 of a syringe 300 according to an embodiment of the present invention. This embodiment provides a syringe residual liquid detection method applied to a syringe pump. The syringe pump 200 includes a position sensor 250 disposed at a second trigger position on the plunger's movement path. The syringe residual liquid detection method includes the following steps: S101. With the calibration fixture 100 installed, the first trigger signal when the push rod 210 passes the trigger sensor 220 and the first cutoff signal emitted by the pressure sensor 250 are acquired sequentially. S102. Determine the first distance traveled by the push rod 210 based on the first trigger signal and the first cutoff signal; S103. With the syringe 300 to be calibrated installed, the second trigger signal when the plunger 210 passes the trigger sensor 220 and the second cut-off signal emitted by the pressure sensor 250 are acquired sequentially. S104. Determine the second distance traveled by the push rod 210 based on the second trigger signal and the second cutoff signal; S105. Determine the extension length of the plunger 320 of the syringe 300 beyond the extension length of the syringe barrel 310 when the syringe 300 is emptied, based on the first distance and the second distance. S106. Obtain the third trigger signal when the push rod 210 passes the position sensor 250; S107. Obtain the third distance from the position sensor 250 to the extreme position 270 of the push rod 210; S108. Obtain the fourth distance from the trigger sensor 220 to the extreme position 270 of the push rod 210; S109. Obtain the third number of rotations of the motor after the third trigger signal is detected; S110. Based on the third distance, the fourth distance, the extension length, and the first distance, determine the first emptying distance of the syringe 300 push handle 320 when the push rod 210 passes the position sensor 250. S111. Based on the third number of rotations and the first emptying distance, determine the second emptying distance of the syringe 300 push handle 320 when the push rod 210 reaches any position after passing the position sensor 250.

[0058] Steps S101 to S105 have been described in detail in Embodiment 2, and will not be repeated here.

[0059] Specifically, it is necessary to acquire the third trigger signal when the push rod 210 passes the position sensor 250. By monitoring the position of the push rod 210, the third trigger signal is recorded when it passes the position sensor 250. This signal can serve as a marker that the push rod 210 has reached a specific position.

[0060] A third distance needs to be obtained from the position sensor 250 to the extreme position 270 of the push rod 210. The extreme position 270 of the push rod 210 is the position that the end of the push rod 210 can reach when the push block 230 reaches its closest position to the machine body. Figure 5 As shown, the extreme position 270 is the farthest position that the push rod 210 can reach, which is the maximum range that the push rod 210 can move to (the rightmost end in the figure). By measuring the distance from the position sensor 250 to the extreme position 270, the third distance of the push rod 210 can be determined.

[0061] A fourth distance needs to be obtained from the trigger sensor 220 to the extreme position 270 of the push rod 210. Similar to obtaining the third distance, the fourth distance of the push rod 210 can be determined by measuring the distance from the trigger sensor 220 to the extreme position 270.

[0062] It is necessary to obtain the third number of motor rotations after the third trigger signal is detected. Similar to obtaining the first number of rotations, the number of motor rotations is recorded after the third trigger signal is detected by monitoring the motor's rotation.

[0063] Based on the third distance, the fourth distance, the extension length, and the first distance, the first emptying distance of the syringe 300 push handle 320 when the push rod 210 passes the position sensor 250 can be determined. By performing appropriate calculations on the third and fourth distances, and combining the extension length and the first distance, the first emptying distance of the syringe 300 push handle 320 when the push rod 210 passes the position sensor 250 can be determined.

[0064] The emptying distance is the distance from the end of the plunger 320 to the bottom of the syringe 300, and the remaining amount of syringe fluid in the syringe 300 can be determined from the emptying distance.

[0065] Based on the third number of rotations and the first emptying distance, the second emptying distance of the syringe 300 push handle 320 when the push rod 210 reaches any position after passing the position sensor 250 can be determined. By calculating the product of the third number of rotations and the first emptying distance, the second emptying distance of the syringe 300 push handle 320 when the push rod 210 reaches any position after passing the position sensor 250 can be determined.

[0066] In this embodiment, both the position sensor 250 and the trigger sensor 220 are fixedly mounted on the injection pump 200 and do not undergo relative displacement with respect to the pump body. On a certain model of injection pump, the limit position 270 that the push rod 210 can reach is also a fixed position. The positions of the limit position 270, the position sensor 250, and the trigger sensor 220 are all fixed positions, and the distance between the two fixed positions is a constant value.

[0067] Specifically, the distance from the extreme position 270 of the push rod 210 to the position sensor 250 is the third distance, which can be denoted as... The distance from the extreme position 270 of the push rod 210 to the trigger sensor 220 is the fourth distance, which can be denoted as... .

[0068] The first emptying distance is the distance from the end of the push handle 320 to the bottom of the syringe 300 when the third trigger signal is received. As the push handle 320 moves with the push rod 210 under the action of the push block 230, the distance that the push rod 210 moves from when it passes the position sensor 250 until the syringe 300 is completely emptied is equal to the first emptying distance.

[0069] The distance of the first row of empty space can be calculated using the following formula: in, This is the first row of empty distance. The third distance, This is the fourth distance.

[0070] As known from Example 2: We can obtain: Will Substitute into the formula for calculating the first row of empty space: in, The third distance, The fourth distance, To calibrate the length of the protrusion 120 of tooling 100, For the extended length, This is the first distance.

[0071] For a certain model of syringe 300, when syringe 300 is emptied, the plunger 320 of syringe 300 extends beyond the extension length of syringe barrel 310. It is a definite value. The extension 120 of the calibration fixture 100 is fixed relative to the positioning part 110, and the length of the extension 120 remains unchanged. Therefore, the length of the extension 120 of the calibration fixture 100... and first distance It is a definite value. The above formula eliminates... It can be directly represented by three definite values. It is more convenient and accurate.

[0072] The second emptying distance, which is the distance of the syringe 300 handle 320 when the push rod 210 reaches any position after passing the position sensor 250, can be calculated using the following formula: Right now: in, The third distance, The fourth distance, To calibrate the length of the protrusion 120 of tooling 100, For the extended length, The first distance, This refers to the third rotation of the motor when the push rod 210 reaches any position after passing the position sensor 250. This refers to the distance that the push rod 210 moves when the motor rotates one revolution.

[0073] In the formula for calculating the second emptying distance, the third distance, the fourth distance, the length of the protrusion 120 of the calibration fixture 100, the protrusion length, and the distance the push rod 210 moves with one revolution of the motor are all fixed values ​​with high precision. The first distance is a calculated value, derived from the first number of revolutions and the distance the push rod 210 moves with one revolution of the motor. The distance the push rod 210 moves with one revolution of the motor is a fixed value. The first number of revolutions is measured by a photoelectric counter, and the data obtained by the photoelectric counter is accurate, so the first distance has high precision. The third number of revolutions is also measured by a photoelectric counter, and the data obtained by the photoelectric counter is accurate.

[0074] In summary, the data used to calculate the second empty distance is highly accurate, resulting in a highly accurate calculated second empty distance. The second empty distance allows for real-time detection of the remaining syringe volume within 300 ml of liquid, with high accuracy, thus better ensuring injection precision and timing.

[0075] Example 5 This embodiment provides a calibration device for the offset position of a syringe plunger, including: The first receiving module is used to sequentially acquire the first trigger signal and the first cutoff signal; The first ranging module is used to determine the first distance traveled by the push rod 210 based on the first trigger signal and the first cutoff signal; The second receiving module is used to sequentially acquire the second trigger signal and the second cutoff signal; The second ranging module is used to determine the second distance traveled by the push rod 210 based on the second trigger signal and the second cutoff signal; The first calculation module is used to determine the extension length of the plunger 320 of the syringe 300 extending out of the syringe barrel 310 when the syringe 300 is emptied, based on the first distance and the second distance.

[0076] The beneficial effects of the syringe plunger offset position calibration device in this embodiment are equivalent to the beneficial effects of the above-described method for calibrating the offset position of syringe 300 plunger 320, and will not be repeated here.

[0077] Example 6 This embodiment provides a syringe residual liquid detection device, including: The third receiving module is used to acquire the third trigger signal when the push rod 210 passes the position sensor 250; The third ranging module is used to obtain the third distance from the position sensor 250 to the extreme position 270 of the push rod 210; The fourth ranging module is used to obtain the fourth distance from the trigger sensor 220 to the extreme position 270 of the push rod 210; The counting module is used to obtain the third number of rotations of the motor after the third trigger signal is detected; The second calculation module is used to determine the first emptying distance of the syringe 300 push handle 320 when the push rod 210 passes the position sensor 250, based on the third distance, the fourth distance, the third number of rotations, the extension length and the first distance determined in Embodiment 5. The third calculation module is used to determine the second emptying distance of the syringe 300 push handle 320 when the push rod 210 reaches any position after passing the position sensor 250, based on the third number of rotations and the first emptying distance.

[0078] The beneficial effects of the syringe residual liquid detection device in this embodiment are equivalent to the beneficial effects of the syringe residual liquid detection method described above, and will not be repeated here.

[0079] Example 7 This embodiment provides an injection pump 200, including: A trigger sensor 220 is set on the movement path of the plunger 320 of the injection pump 200 for triggering a first trigger signal or a second trigger signal; A position sensor 250 is positioned on the movement path of the plunger 320 of the injection pump 200 to trigger a third trigger signal; A counting device used to obtain the number of rotations of the motor shaft; The pressure sensor 250 installed on the push block 230 is used to trigger a first cutoff signal or a second cutoff signal when the pressure sensed by the pressure sensor 250 reaches a preset value. The processor is communicatively connected to the trigger sensor 220, the position sensor 250, the counting device, and the pressure sensor 250, respectively; and The memory is used to store computer programs, and the processor is used to execute the computer programs to implement the method for calibrating the offset position of the syringe 300 plunger 320 in Embodiment 2 or the syringe residual liquid detection method in Embodiment 5.

[0080] The beneficial effects of the syringe pump 200 in this embodiment are equivalent to the beneficial effects of the above-described method for calibrating the offset position of the syringe plunger 320 or the syringe residual liquid detection method, and will not be repeated here.

[0081] Example 8 This embodiment provides a storage medium, characterized in that: the storage medium stores program instructions, which are used to execute the method for calibrating the offset position of the syringe 300 plunger 320 in Embodiment 2 or the syringe residual liquid detection method in Embodiment 5.

[0082] The beneficial effects of the storage medium in this embodiment are equivalent to the beneficial effects of the above-described method for calibrating the offset position of the syringe 300 plunger 320 or the syringe residual liquid detection method, and will not be repeated here.

[0083] It is understood that those skilled in the art can combine various implementation methods in the above embodiments under the guidance of the above examples to obtain technical solutions with multiple implementation methods.

[0084] The above are merely preferred embodiments of the present invention and are 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 detecting residual liquid in a syringe, characterized in that, The method is applied to an injection pump, which includes a trigger sensor located at a first trigger position on the movement path of the plunger, and a pressure sensor located on the injection pump push block that can contact the injection plunger handle. When the pressure value of the pressure sensor reaches the syringe emptying threshold, the pressure sensor sends a cut-off signal. A position sensor is set at a second trigger position on the push rod's movement path. The syringe residual liquid detection method includes the following steps: The calibration fixture is installed on the syringe mounting position of the injection pump. The calibration fixture includes: a positioning part for connecting with the syringe mounting position of the injection pump, the positioning part being provided with a limiting structure; and an extension part of fixed length extending from one end of the positioning part. The first trigger signal when the push rod passes the trigger sensor and the first cutoff signal emitted by the pressure sensor are acquired sequentially. The first distance traveled by the push rod is determined based on the first trigger signal and the first cutoff signal; With the syringe to be calibrated installed, the second trigger signal when the plunger passes the trigger sensor and the second cutoff signal emitted by the pressure sensor are acquired sequentially. The second distance traveled by the push rod is determined based on the second trigger signal and the second cutoff signal; Based on the first distance and the second distance, determine the length by which the syringe plunger extends beyond the syringe barrel when the syringe is emptied; Install the syringe in the syringe mounting position of the injection pump and obtain the third trigger signal when the plunger passes the position sensor; Obtain the third distance from the position sensor to the extreme position of the push rod; Obtain the fourth distance from the trigger sensor to the extreme position of the push rod; Obtain the third number of motor rotations after the third trigger signal is detected; Based on the third distance, the fourth distance, the third number of rotations, the extension length, and the first distance, determine the first emptying distance of the syringe plunger when the plunger passes the position sensor; Based on the third number of rotations and the first emptying distance, determine the second emptying distance of the syringe plunger when it reaches any position after passing the position sensor.

2. The syringe residual liquid detection method as described in claim 1, characterized in that, The length by which the syringe plunger extends beyond the syringe barrel when the syringe is emptied is determined by the following formula: The distance for the first empty space is determined by the following formula: The second emptying distance is determined by the following formula: Right now: in, The second distance, For the first distance, The third distance, For the fourth distance, The length of the protruding part of the calibration fixture. The protrusion length is... For the first distance, The third number of rotations of the motor when the push rod reaches any position after passing the position sensor. This refers to the distance the push rod moves when the motor rotates one revolution.

3. The syringe residual liquid detection method as described in claim 1, characterized in that, Determining the first distance traveled by the push rod based on the first trigger signal and the first cutoff signal includes: Obtain the first number of motor rotations between the first trigger signal and the first cutoff signal; Based on the first number of rotations, determine the first distance traveled by the push rod when the first cutoff signal is detected; The second distance traveled by the push rod is determined based on the second trigger signal and the second cutoff signal, including: Obtain the second number of motor rotations between the second trigger signal and the second cutoff signal; Based on the second number of rotations, determine the second distance traveled by the injection pump push rod when the second cutoff signal is detected.

4. A syringe residual liquid detection device, used to implement the syringe residual liquid detection method according to claim 1, characterized in that, include: The first receiving module is used to sequentially acquire the first trigger signal and the first cutoff signal; The first ranging module is used to determine the first distance traveled by the push rod based on the first trigger signal and the first cutoff signal; The second receiving module is used to sequentially acquire the second trigger signal and the second cutoff signal; The second ranging module is used to determine the second distance traveled by the push rod based on the second trigger signal and the second cutoff signal; The first calculation module is used to determine, based on the first distance and the second distance, the extension length of the syringe plunger beyond the syringe barrel when the syringe is emptied. The third receiving module is used to acquire the third trigger signal when the push rod passes the position sensor; The third ranging module is used to obtain the third distance from the position sensor to the extreme position of the push rod; The fourth ranging module is used to obtain the fourth distance from the trigger sensor to the extreme position of the push rod; The counting module is used to obtain the third number of rotations of the motor after the third trigger signal is detected; The second calculation module is used to determine the first emptying distance of the syringe plunger when the plunger passes the position sensor, based on the third distance, the fourth distance, the third number of rotations, the extension length, and the first distance. The third calculation module is used to determine the second emptying distance of the syringe plunger when the plunger reaches any position after passing the position sensor, based on the third number of rotations and the first emptying distance.

5. An injection pump, characterized in that, include: A trigger sensor is installed on the movement path of the syringe pump push handle to trigger a first trigger signal or a second trigger signal; A position sensor is installed on the movement path of the syringe pump push handle to trigger a third trigger signal; A counting device used to obtain the number of rotations of the motor shaft; A pressure sensor installed on the push block is used to trigger a first cutoff signal or a second cutoff signal when the pressure sensed by the pressure sensor reaches a preset value. The processor is communicatively connected to a trigger sensor, a position sensor, a counting device, and a pressure sensor, respectively. as well as A memory for storing a computer program, and a processor for executing the computer program to implement the syringe residual liquid detection method as described in claim 1.

6. A storage medium, characterized in that, The storage medium stores program instructions that, when executed by a processor, implement the syringe residual liquid detection method of claim 1.

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