Pipe blockage detection method and pipe blockage detection device

Abstract

The invention provides a tube blocking detection method and a tube blocking detection device. The tube blocking detection device comprises a medicine storage device used for storing liquid medicine, a piston arranged in the medicine storage device in a sliding mode and a push rod used for pushing the piston to slide in the medicine storage device so that the liquid medicine can overflow out of the medicine storage device. The tube blocking detection device further comprises a detection device and a control device. The pipe blocking detection method comprises the following steps that the actual sliding distance of the push rod within the preset time is obtained through the detection device; the theoretical sliding distance of the push rod in the preset time is calculated and obtained through the control device; obtaining a difference value between the theoretical distance and the actual distance through a control device; whether the difference value is larger than a preset threshold value or not is judged through the control device, and when the difference value is larger than the preset threshold value, pipe blockage is confirmed; when the difference value is smaller than or equal to a preset threshold value, it is determined that pipe blocking is not conducted. Whether the infusion pump is blocked or not can be detected, so that countermeasures can be taken in time, and the situation that normal infusion is affected due to pipe blocking of the infusion pump is relieved.

Description

Technical Field

[0001] The present application belongs to the technical field of infusion pumps, and more specifically, to a tube blockage detection method and a tube blockage detection device. Background Art

[0002] The infusion pump, also known as the analgesic pump, enables analgesics to maintain a timely and stable concentration in the plasma, and allows patients to administer the drug by pressing the pump themselves to quickly enhance the effect, making the treatment more individualized.

[0003] During the use of the infusion pump, due to long working hours, tubing bends or other improper use, it may cause tube blockage, making the infusion pump unable to infuse normally and affecting the patient's treatment. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a tube blockage detection method and a tube blockage detection device to solve the technical problem in the prior art that an infusion pump may be blocked during use and affect normal infusion.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a tube blockage detection method for detecting whether an infusion pump is blocked, wherein the infusion pump comprises a medicine reservoir for storing a drug solution, a piston slidably arranged in the medicine reservoir, and a push rod for pushing the piston to slide in the medicine reservoir so that the drug solution overflows from the medicine reservoir, and the tube blockage detection method comprises the following steps:

[0006] Obtaining the actual sliding distance of the push rod within a preset time;

[0007] Obtaining a theoretical sliding distance of the push rod within a preset time;

[0008] The difference between the theoretical distance and the actual distance is obtained; when the difference is greater than a preset threshold, it is confirmed that the pipe is blocked; when the difference is less than or equal to the preset threshold, it is confirmed that the pipe is not blocked.

[0009] In a possible design, obtaining the actual distance includes:

[0010] Acquire a first distance between the push rod and a first position of the medicine storage container before the preset time;

[0011] Acquire a second distance between the push rod and the first position of the medicine storage container after the preset time;

[0012] The actual distance is obtained according to a difference between the first distance and the second distance.

[0013] In a possible design, the first distance and the second distance are acquired by a laser distance measuring sensor, and the laser distance measuring sensor is mounted on the push rod; the laser distance measuring sensor includes a photoelectric transmitter and a photoelectric receiver;

[0014] The photoelectric transmitter emits light to the first position of the medicine reservoir, and the photoelectric receiver receives light reflected from the first position of the medicine reservoir, and the first distance and the second distance are calculated based on the time between emitting the light and receiving the light and the speed of light.

[0015] In a possible design, the degree of pipe blockage is determined based on the difference; the larger the difference, the greater the degree of pipe blockage.

[0016] The beneficial effect of the tube blockage detection method provided by the present application is that the tube blockage detection method provided by the embodiment of the present application obtains the actual distance and theoretical distance of the push rod sliding within a preset time respectively, and determines whether the infusion pump is blocked by the difference between the actual distance and the theoretical distance. Specifically, when the difference is less than or equal to the preset threshold, it means that the infusion pump is not blocked, or the degree of blockage is small, which does not affect the normal infusion, and no countermeasures are needed. When the difference is greater than the preset threshold, it means that the degree of blockage of the injection pump is large, and timely countermeasures need to be taken. The present application detects whether the infusion pump is blocked by the above-mentioned tube blockage detection method, so that timely countermeasures can be taken to alleviate the situation where the infusion pump is affected by normal infusion due to tube blockage.

[0017] On the other hand, the present application also provides a pipe blockage detection device, including a medicine storage container for storing medical liquid, a piston slidably arranged in the medicine storage container, and a push rod for pushing the piston to slide in the medicine storage container so that the medical liquid overflows from the medicine storage container. The pipe blockage detection device also includes a detection device and a control device. The detection device is used to detect the actual distance that the push rod slides within a preset time, and the control device calculates and obtains the theoretical distance that the push rod slides within the preset time; the control device also calculates the difference between the theoretical distance and the actual distance, and judges whether the difference is greater than a preset threshold value. When the difference is greater than the preset threshold value, it is confirmed that the pipe is blocked; when the difference is less than or equal to the preset threshold value, it is confirmed that the pipe is not blocked.

[0018] In a possible design, the detection device includes a laser ranging sensor; the laser ranging sensor is installed on the push rod; the laser ranging sensor includes a photoelectric transmitter and a photoelectric receiver.

[0019] In a possible design, a receiving groove is formed on one side of the push rod facing the first position of the medicine reservoir; the receiving groove has an opening facing the first position of the medicine reservoir; the photoelectric transmitter and the photoelectric receiver are installed in the receiving groove and face the opening.

[0020] In a possible design, a transparent cover that allows light to pass through is installed at the opening of the accommodating groove.

[0021] In a possible design, a reflective layer for reflecting light is provided on the outer side wall of the medicine reservoir at the first position.

[0022] In a possible design, the first position is the drug liquid outflow end of the drug reservoir;

[0023] The reflective layer is coated on the outer side wall of the drug storage container at the drug liquid outflow end;

[0024] Alternatively, the reflective layer is adhered to the outer wall of the drug storage container at the drug liquid outflow end.

[0025] In a possible design, the push rod is movably in contact with a side of the piston that is away from the first position of the drug reservoir.

[0026] The beneficial effect of the tube blockage detection device provided by the present application is that: the tube blockage detection device provided in the embodiment of the present application, by adding a detection device and a control device on the basis of the existing infusion pump, can realize tube blockage detection of the infusion pump, that is, tube blockage detection is realized without affecting the normal infusion of the infusion pump, and the normal infusion and tube blockage detection are independent of each other and do not affect each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 A schematic diagram of a flow chart of a pipe blockage detection method provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of a process for obtaining an actual distance in a pipe blockage detection method provided in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of the assembly of a push rod, a piston and a medicine storage container in a pipe blockage detection device provided in an embodiment of the present application;

[0031] Figure 4A schematic diagram of the structure of a push rod in a pipe blockage detection device provided in an embodiment of the present application;

[0032] Figure 5 A schematic diagram of the structure of a drug liquid outflow end of a drug storage device in a pipe blockage detection device provided in an embodiment of the present application;

[0033] Figure 6 This is a schematic diagram of the assembly of the push rod, piston, drug reservoir, detection device and reflective layer in the pipe blockage detection device provided in an embodiment of the present application.

[0034] Among them, the reference numerals in the figure are:

[0035] 1. Push rod; 101. Main body; 1011. Receiving groove; 102. Transparent cover; 2. Piston; 201. Enclosure; 3. Medicine reservoir; 301. Medicine liquid injection end; 302. Medicine liquid outflow end; 303. Injection hole; 4. Detection device; 401. Photoelectric transmitter; 402. Photoelectric receiver; 5. Reflection layer. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0038] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] As described in the background art, during the use of an infusion pump, due to long working hours, tubing bends or other improper use, the tube may be blocked, making the infusion pump unable to infuse normally, affecting the patient's treatment.

[0041] To this end, an embodiment of the present application provides a tube blockage detection method for detecting whether an infusion pump is blocked, so that when blockage occurs, timely countermeasures can be taken to alleviate the situation where the infusion pump is affected by normal infusion due to tube blockage.

[0042] See also Figure 3 The infusion pump comprises a medicine reservoir 3, a piston 2 and a push rod 1. The medicine reservoir 3 is used to store liquid medicine, the piston 2 is slidably disposed in the medicine reservoir 3, and the push rod 1 is used to push the piston 2 to slide in the medicine reservoir 3 so that the liquid medicine overflows the medicine reservoir 3.

[0043] See also Figure 1 The pipe blockage detection method provided in the embodiment of the present application includes the following steps:

[0044] S10: Obtaining the actual sliding distance of the push rod 1 within a preset time;

[0045] S20: Obtaining a theoretical sliding distance of the push rod 1 within a preset time;

[0046] S30: Obtaining the difference between the theoretical distance and the actual distance; when the difference is greater than a preset threshold, confirming that the pipe is blocked; when the difference is less than or equal to the preset threshold, confirming that the pipe is not blocked.

[0047] The theoretical distance refers to the distance that the push rod 1 slides in the medicine reservoir 3 within the preset time when the infusion pump is initially assembled, the pipeline of the infusion pump is intact, that is, the pipeline of the infusion pump is not bent, the pipeline of the infusion pump is not compressed, etc., and the infusion pump is used correctly.

[0048] The actual distance refers to the distance that the push rod 1 slides within a certain preset period of time after the infusion pump has been used for a period of time.

[0049] The difference refers to the difference between the theoretical distance and the actual distance, that is, the value obtained by subtracting the actual distance from the theoretical distance.

[0050] The setting of the preset threshold is a threshold value given by this application for the degree of tube blockage. When the difference between the theoretical distance and the actual distance is less than or equal to the preset threshold, it means that the infusion pump is not blocked or the degree of tube blockage is small, and the degree of tube blockage does not affect the normal infusion of the infusion pump, so no countermeasures can be taken. When the difference between the theoretical distance and the actual distance is greater than the preset threshold, it means that the degree of tube blockage is large, and the tube blockage has affected the normal infusion of the infusion pump. At this time, it is necessary to take timely countermeasures for the tube blockage to alleviate the situation where the infusion pump is affected by the normal infusion due to the tube blockage.

[0051] Among them, the preset threshold can be obtained based on multiple tests. For example, the pipeline of the infusion pump can be blocked multiple times to different degrees, such as bending and compressing the pipeline, and the appropriate preset threshold can be selected according to the impact of different degrees of blockage of the infusion pump on the infusion.

[0052] In one embodiment, the degree of pipe blockage is determined based on the difference. The larger the difference, the greater the degree of pipe blockage. Since the difference is the difference between the theoretical distance and the actual distance, the larger the difference, the smaller the actual distance, that is, the smaller the distance that the push rod 1 slides within the preset time, the greater the degree of pipe blockage.

[0053] Different countermeasures will be taken for different degrees of tube blockage. When the blockage is minor, the cause of the blockage can be analyzed during the infusion process and a solution can be found; when the blockage is severe, the infusion needs to be stopped in time and the cause of the blockage needs to be found as soon as possible.

[0054] In addition, the cause of the pipe blockage can also be determined based on the degree of pipe blockage. For example, the pipe blockage is relatively small when the pipe is bent, while the pipe blockage is relatively large when the pipe is compressed. Of course, there may be other reasons for pipe blockage, which are not listed here one by one.

[0055] In one embodiment, see Figure 2 and Figure 3 , get the actual distance including:

[0056] S11: Obtaining a first distance between the push rod 1 and a first position of the medicine storage 3 before a preset time;

[0057] S12: Obtaining a second distance between the push rod 1 and the first position of the medicine storage 3 after a preset time;

[0058] S13: Obtaining an actual distance according to a difference between the first distance and the second distance.

[0059] In this embodiment, the first position of the medicine reservoir 3 is used as the reference position, and the distance that the push rod 1 slides relative to the first position of the medicine reservoir 3 within the preset time is obtained to obtain the actual distance that the push rod 1 slides within the preset time. Among them, the reference position in the process of obtaining the first distance and the second distance remains unchanged, the sliding body (both push rod 1) of the first distance and the second distance remains unchanged, and the driving member used to drive the sliding body (push rod 1) to slide in the process of obtaining the first distance and the second distance remains unchanged. In this way, the actual distance obtained by the difference between the first distance and the second distance will not be affected by the poor consistency of the structural performance of the driving member, the push rod 1 and the reference position, thereby reducing the probability of actual distance detection error and pipe blockage judgment error; at the same time, the structural performance consistency requirements for the driving member, the push rod 1 and the reference position for obtaining the actual distance can be reduced, thereby reducing the structural cost.

[0060] In one embodiment, the first distance and the second distance are obtained by a laser distance measuring sensor, which is installed on the push rod 1. Since laser has the characteristics of good linearity, small divergence angle, and concentrated energy, the accuracy of the first distance and the second distance measurement can be guaranteed, thereby reducing the misjudgment of pipe blockage detection.

[0061] Specifically, the laser ranging sensor can calculate the first distance and the second distance by a pulse method, a phase method and a trigonometric method.

[0062] In one embodiment, see Figure 4 and Figure 6 The laser distance sensor calculates the first distance and the second distance by a pulse method. Specifically, the laser distance sensor includes a photoelectric transmitter 401 and a photoelectric receiver 402; the photoelectric transmitter 401 transmits light to the first position of the medicine reservoir 3, and the photoelectric receiver 402 receives the light reflected from the first position of the medicine reservoir 3, and the first distance and the second distance are calculated according to the time between the emission of the light and the reception of the light and the speed of light.

[0063] Specifically, the laser distance sensor calculates the distance from the push rod 1 to the first position of the medicine storage 3 by counting the time t from each time the photoelectric transmitter 401 transmits light to the photoelectric receiver 402 receiving light, and calculates the distance according to the formula L=ct / 2, where c is the speed of light. The actual distance ΔL=L1-L2, L1 is the first distance, and L2 is the second distance.

[0064] In other embodiments of the present application, the first distance and the second distance may also be obtained by other methods, for example, a scale may be directly set on the side wall of the medicine reservoir, and the position of the push rod 1 in the medicine reservoir may be read out by the scale; for example, the distance may be measured by electromagnetic wave ranging method. In addition, in other embodiments of the present application, the actual distance may also be obtained by other methods, for example, an acceleration sensor may be installed on the push rod 1, and the sliding distance of the push rod 1 may be calculated by acceleration.

[0065] In one embodiment, the theoretical distance is obtained according to the amount of medicine to be injected. Specifically, the amount of medicine to be injected can be determined according to the patient's physical condition, the liquid medicine to be injected is loaded into the medicine reservoir 3, and then the piston 2 is pushed by the push rod 1 to slide in the medicine reservoir 3 so that the liquid medicine overflows the medicine reservoir 3, and the distance that the push rod 1 slides when all the liquid medicine in the medicine reservoir 3 is injected out is calculated, which is the theoretical distance. The theoretical distance can be calculated by the amount of medicine V to be injected and the cross-sectional area S of the medicine reservoir 3, L0 = V / S, so that the theoretical distance can be calculated.

[0066] In addition, when the push rod 1 pushes the piston 2 to inject medicine at a preset speed, the time required for the push rod 1 to inject all the medicine liquid can also be calculated. This time is the preset sliding time of the push rod 1.

[0067] In other embodiments of the present application, a preset dose of medicine can also be customized and stored in the medicine storage container 3, and the theoretical sliding distance and the preset time required when the push rod 1 injects the preset dose of medicine are calculated, and then the actual sliding distance when the preset dose of medicine is injected is obtained through the preset time, and finally the difference between the theoretical distance and the actual distance is used to determine whether the tube is blocked.

[0068] In another embodiment of the present application, it is also possible to determine whether the infusion pump is blocked based on the speed. Specifically, the actual speed can be calculated based on the actual distance and the preset time; then the theoretical speed can be calculated based on the theoretical distance and the preset time, and the difference between the theoretical speed and the actual speed is compared with the preset threshold corresponding to the speed. If the difference is greater than the preset threshold, it means that the tube is blocked, and the larger the difference, the more serious the blockage.

[0069] In one embodiment, the tube blockage detection may be performed each time the liquid is injected, or may be performed at a specific time period, or may be performed during a large-dose injection.

[0070] On the other hand, the present application also provides a pipe blockage detection device, which is used to implement the above-mentioned pipe blockage detection method to detect pipe blockage.

[0071] See also Figures 3 to 6 The pipe blockage detection device includes a medicine reservoir 3, a piston 2 and a push rod 1, wherein the piston 2 is slidably arranged in the medicine reservoir 3, one end of the push rod 1 movably abuts the piston 2, and the other end is exposed from the medicine reservoir 3. In this embodiment, the medicine reservoir 3 is used to store liquid medicine, and the push rod 1 is used to push the piston 2 to slide in the medicine reservoir 3 so that the liquid medicine overflows the medicine reservoir 3. In addition, the pipe blockage detection device also includes a detection device 4 and a control device (not shown in the drawings), the detection device 4 is used to detect the actual distance that the push rod 1 slides within a preset time, and the control device calculates and obtains the theoretical distance that the push rod 1 slides within the preset time; the control device also calculates the difference between the theoretical distance and the actual distance, and judges whether the difference is greater than a preset threshold value. When the difference is greater than the preset threshold value, it is confirmed that the pipe is blocked; when the difference is less than or equal to the preset threshold value, it is confirmed that the pipe is not blocked.

[0072] In the embodiment of the present application, by adding a detection device 4 and a control device on the basis of the existing infusion pump, it is possible to realize tube blockage detection of the infusion pump, that is, tube blockage detection is realized without affecting the normal infusion of the infusion pump, and normal infusion and tube blockage detection are independent of each other and do not affect each other.

[0073] In one embodiment, see Figure 4and Figure 6 , the detection device 4 includes a laser distance sensor, which is installed on the push rod 1. In the present embodiment, the laser distance sensor includes a photoelectric transmitter 401 and a photoelectric receiver 402. Specifically, light is emitted to the first position of the medicine reservoir 3 by the photoelectric transmitter 401, and the light reflected from the first position of the medicine reservoir 3 is received by the photoelectric receiver 402, and the first distance and the second distance are calculated according to the time between the emission of the light and the reception of the light and the speed of light, and then the control device calculates the actual distance according to the difference between the first distance and the second distance. It can be understood that in other embodiments of the present application, when the push rod 1 is fixedly connected to the piston 2, the above-mentioned laser distance sensor can also be installed on the piston 2, and the blockage of the pipe is judged by calculating the actual distance that the piston 2 slides relative to the medicine reservoir 3, which is not the only limitation here.

[0074] In one embodiment, see Figure 4 , a receiving groove 1011 is formed on one side of the push rod 1 facing the first position of the medicine reservoir 3; the receiving groove 1011 has an opening facing the first position of the medicine reservoir 3; the photoelectric transmitter 401 and the photoelectric receiver 402 are installed in the receiving groove 1011 and face the opening. The light emitted by the photoelectric transmitter 401 can be emitted to the first position of the medicine reservoir 3 through the opening, and the light reflected by the first position of the medicine reservoir can also be received by the photoelectric receiver 402 through the above opening. In this embodiment, by forming the receiving groove 1011 for accommodating the photoelectric transmitter 401 and the photoelectric receiver 402 in the push rod 1, the photoelectric transmitter 401 and the photoelectric receiver 402 will not be exposed outside the push rod 1, which can protect the photoelectric transmitter 401 and the photoelectric receiver 402 on the one hand, and on the other hand, the photoelectric transmitter 401 and the photoelectric receiver 402 can be installed near the center of the push rod 1, so as to emit light to and receive light in the medicine reservoir 3.

[0075] In one embodiment, see Figure 4 A transparent cover 102 that can transmit light is installed at the opening of the receiving groove 1011. The transparent cover 102 can not only protect the photoelectric transmitter 401 and the photoelectric receiver 402 from being corroded by the liquid medicine, but also allow light to pass through without affecting the measurement effect of the photoelectric transmitter 401 and the photoelectric receiver 402 on the first distance and the second distance.

[0076] In one embodiment, the transparent cover 102 is a glass cover. In other embodiments of the present application, the transparent cover 102 may also be made of other transparent materials, such as transparent acrylic, polyvinyl chloride or transparent resin.

[0077] In one embodiment, see Figure 5 and Figure 6 , a reflective layer 5 for reflecting light is provided on the outer side wall of the first position of the medicine reservoir 3, and the light emitted by the photoelectric transmitter 401 is reflected to the photoelectric receiver 402 through the reflective layer 5, thereby improving the intensity of the reflected light, improving the accuracy of the photoelectric receiver 402 receiving the light, and thus improving the calculation accuracy of the first distance and the second distance. It can be understood that in other embodiments of the present application, the reflective layer 5 may not be provided on the outer side wall of the first position of the medicine reservoir 3, but the entire medicine reservoir 3 or the first position of the medicine reservoir 3 is made of a material with reflective ability.

[0078] In one embodiment, the reflective layer 5 is coated on the outer wall of the first position of the drug reservoir 3, so that the reflective layer 5 is firmly combined with the outer wall of the drug reservoir 3. It can be understood that in other embodiments of the present application, the reflective layer 5 can also be pasted on the outer wall of the first position of the drug reservoir 3, which is not limited here.

[0079] In one embodiment, see Figure 5 The outer side wall of the medicine reservoir at the first position is blackened to improve the reflectivity of the first position. It is understandable that in other embodiments of the present application, other materials with reflectivity, such as silver, silicon or molybdenum, may also be coated on the outer side wall of the medicine reservoir 3 at the first position.

[0080] In one embodiment, the drug reservoir 3 is made of a transparent material so that the drug amount in the drug reservoir 3 can be monitored in real time.

[0081] Optionally, the drug reservoir 3 can be made of transparent polypropylene (PP for short). It can be understood that in other embodiments of the present application, the drug reservoir 3 can also be made of other transparent medical materials, such as transparent PC or transparent PVC.

[0082] In one embodiment, see Figure 5 The first position is the drug liquid outflow end 302 of the drug reservoir 3; the reflective layer 5 is coated on the outer wall of the drug liquid outflow end 302 of the drug reservoir 3; or, the reflective layer 5 is pasted on the outer wall of the drug liquid outflow end 302 of the drug reservoir 3.

[0083] For details, please refer to Figure 3 The medicine reservoir 3 has two oppositely disposed ends, namely, a medicine liquid injection end 301 and a medicine liquid outflow end 302. The medicine liquid injection end 301 is used to inject medicine liquid into the medicine reservoir, and at the same time, the piston 2 and the push rod 1 are inserted into the medicine reservoir 3 from the medicine liquid injection end 301. The medicine liquid outflow end 302 is used to connect with the infusion tube, and when the push rod 1 pushes the piston 2 to slide in the medicine reservoir 3, the medicine liquid overflows the medicine reservoir 3 through the medicine liquid outflow end 302.

[0084] In the embodiment of the present application, by setting the first position to the medicine liquid outflow end 302 of the medicine reservoir 3, the piston 2 slides to the medicine liquid outflow end 302 of the medicine reservoir 3, and the position of the push rod 1 to the medicine liquid outflow end 302 can still be obtained by the laser distance sensor. At the same time, the position of the laser distance sensor is also set opposite to the position of the medicine liquid outflow end 302, which facilitates the laser distance sensor to transmit and receive light to the medicine liquid outflow end 302. It can be understood that in other embodiments of the present application, the first position can also be a position other than the medicine liquid outflow end 302 of the medicine reservoir 3, such as a position close to the medicine liquid outflow end 302, which is not the only limitation here.

[0085] In one embodiment, the liquid medicine outflow end 302 is conical, and the inner diameter of the liquid medicine outflow end 302 gradually decreases in the direction away from the push rod 1. The liquid medicine outflow end 302 forms an injection hole 303 at the tip for the liquid medicine to flow out. Among them, the conical design, on the one hand, facilitates the guidance of the liquid medicine to the injection hole 303, and on the other hand, when the piston 2 slides to the liquid medicine outflow end 302 of the medicine reservoir 3, the position of the push rod 1 to the liquid medicine outflow end 302 can still be obtained by the laser distance sensor.

[0086] In one embodiment, see Figure 3 , the push rod 1 and the piston 2 are movably abutted on one side of the first position away from the medicine reservoir 3. Specifically, when the push rod 1 slides in the direction of the first position, the push rod 1 and the piston 2 abut each other, so that the push rod 1 can drive the piston 2 to slide in the medicine reservoir 3 to achieve drug injection; when the push rod 1 slides in the direction away from the first position, the push rod 1 is separated from the piston 2, the push rod 1 slides, and the piston 2 does not move. In general, in this application, the piston 2 and the medicine reservoir 3 are disposable items, and the push rod 1, the detection device 4 and the control device are non-disposable items. After each injection, the push rod 1 can be separated from the piston 2, and then a new piston 2 and medicine reservoir 3 can be replaced for the next injection. Such a design can reduce equipment costs while ensuring that patients will not infect each other.

[0087] In one embodiment, see Figure 3 A peripheral edge of the piston 2 away from the first position of the medicine storage container is provided with a surrounding plate 201; the push rod 1 extends into the surrounding plate 201, and the surrounding plate 201 is used to radially limit the push rod 1. The radial limiting of the push rod 1 by the surrounding plate 201 can prevent the force direction of the push rod 1 from deviating from the axial direction of the piston 2, so as to ensure the axial force.

[0088] In one embodiment, the piston 2 is sealedly connected to the drug reservoir 3 , thereby preventing the drug solution in the drug reservoir 3 from flowing out from between the piston 2 and the drug reservoir 3 .

[0089] Specifically, a sealing ring is abutted between the outer wall of the piston 2 and the inner wall of the medicine reservoir 3 . The sealing ring is sleeved on the piston 2 and has an interference fit with the piston 2 . The sealing ring also has an interference fit with the medicine reservoir 3 .

[0090] In one embodiment, the pipe blockage detection device further includes a driving member, which is fixedly connected to the push rod 1 and drives the push rod 1 to perform linear reciprocating motion.

[0091] In one embodiment, the driving member is a motor, and the motor shaft of the motor is connected to the push rod 1 through threaded fitting or clamping.

[0092] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A tube blockage detection method for detecting whether an infusion pump is blocked, wherein the infusion pump comprises a medicine reservoir for storing a drug solution, a piston slidably arranged in the medicine reservoir, and a push rod for pushing the piston to slide in the medicine reservoir so that the drug solution overflows the medicine reservoir, characterized in that: The pipe blockage detection method comprises the following steps: Obtaining the actual sliding distance of the push rod within a preset time; Obtaining a theoretical sliding distance of the push rod within a preset time; The difference between the theoretical distance and the actual distance is obtained; when the difference is greater than a preset threshold, it is confirmed that the pipe is blocked; when the difference is less than or equal to the preset threshold, it is confirmed that the pipe is not blocked.

2. The pipe blockage detection method according to claim 1, characterized in that: Obtaining the actual distance includes: Acquire a first distance between the push rod and a first position of the medicine storage container before the preset time; Acquire a second distance between the push rod and the first position of the medicine storage container after the preset time; The actual distance is obtained according to a difference between the first distance and the second distance.

3. The pipe blockage detection method according to claim 2, characterized in that: The first distance and the second distance are acquired by a laser distance measuring sensor, wherein the laser distance measuring sensor is mounted on the push rod; the laser distance measuring sensor comprises a photoelectric transmitter and a photoelectric receiver; The photoelectric transmitter emits light to the first position of the medicine reservoir, and the photoelectric receiver receives light reflected from the first position of the medicine reservoir, and the first distance and the second distance are calculated based on the time between emitting the light and receiving the light and the speed of light.

4. The pipe blockage detection method according to any one of claims 1 to 3, characterized in that: The degree of pipe blockage is determined according to the difference; the larger the difference, the greater the degree of pipe blockage.

5. A pipe blockage detection device, comprising a medicine reservoir for storing a medicine liquid, a piston slidably arranged in the medicine reservoir, and a push rod for pushing the piston to slide in the medicine reservoir so that the medicine liquid overflows the medicine reservoir, characterized in that: The pipe blockage detection device also includes a detection device and a control device, wherein the detection device is used to detect the actual distance that the push rod slides within a preset time, and the control device calculates and obtains the theoretical distance that the push rod slides within the preset time; The control device also calculates the difference between the theoretical distance and the actual distance, and determines whether the difference is greater than a preset threshold value. When the difference is greater than the preset threshold value, it is confirmed that the pipe is blocked; when the difference is less than or equal to the preset threshold value, it is confirmed that the pipe is not blocked.

6. The pipe blockage detection device according to claim 5, characterized in that: The detection device comprises a laser distance measuring sensor; the laser distance measuring sensor is installed on the push rod; the laser distance measuring sensor comprises a photoelectric transmitter and a photoelectric receiver.

7. The pipe blockage detection device according to claim 6, characterized in that: A receiving groove is formed on one side of the push rod facing the first position of the medicine reservoir; the receiving groove has an opening facing the first position of the medicine reservoir; the photoelectric transmitter and the photoelectric receiver are installed in the receiving groove and face the opening.

8. The pipe blockage detection device according to claim 7, characterized in that: A transparent cover capable of transmitting light is installed at the opening of the accommodating groove.

9. The pipe blockage detection device according to claim 5, characterized in that: A reflective layer for reflecting light is provided on the outer side wall of the first position of the medicine storage container.

10. The pipe blockage detection device according to claim 9, characterized in that: The first position is the drug liquid outflow end of the drug reservoir; The reflective layer is coated on the outer side wall of the drug storage container at the drug liquid outflow end; Alternatively, the reflective layer is adhered to the outer wall of the drug storage container at the drug liquid outflow end.

11. The pipe blockage detection device according to claim 5, characterized in that: The push rod is movably in contact with a side of the piston that is away from the first position of the medicine storage container.

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