Silk hole detection device for hollow fiber membrane of dialyzer

Abstract

The utility model provides a dialyzer hollow fiber membrane silk hole detection device. The detection device comprises an image acquisition mechanism, a motion control mechanism and a computer. In a light environment, the image acquisition mechanism acquires screw hole images at two ends of the hollow fiber membrane of the dialyzer by using a camera and a lens; the motion control mechanism is used for lifting the dialyzer hollow fiber membrane to a photographing position by utilizing a lifting mechanism, and then driving the dialyzer hollow fiber membrane to perform circumferential rotation action by utilizing a rotating mechanism so as to assist the image acquisition mechanism in performing rotary photographing on the dialyzer hollow fiber membrane; and the computer is used for acquiring a screw hole image. According to the utility model, the high-resolution camera, the lens and the light source system are used for shooting images of the hollow fiber membrane, so that tiny screw hole defects can be identified, the identification precision is high, and a hardware basis is provided for detecting the quality of the hollow fiber membrane screw holes.

Description

Technical Field

[0001] The utility model relates to a dialyzer hollow fiber membrane pore detection device, belonging to the technical field of dialyzer quality detection. Background Art

[0002] A hemodialyzer is a medical device used to purify blood in patients with chronic renal failure. Its primary function is to remove metabolic waste and excess water from the patient's blood, replacing a dysfunctional kidney. The basic principle of a hemodialyzer is to utilize a semipermeable membrane for substance exchange, purifying the blood through two processes: diffusion (diffusion) and convection (ultrafiltration).

[0003] Hollow fiber membrane is a key component in the dialyzer. It is composed of thousands of tiny hollow fibers, each of which is semipermeable. The main functions of the hollow fiber membrane include: (1) Selective filtration. The semipermeability of the hollow fiber membrane allows small molecules (such as urea, creatinine and other metabolic wastes) to pass through, while preventing large molecules (such as blood cells and proteins) from passing through, thereby achieving blood purification. (2) Efficient mass transfer. Due to the tiny pore size and huge surface area of ​​the hollow fiber, the contact area between blood and dialysate on both sides of the membrane is large, and the mass transfer efficiency is high, so that waste can be quickly transferred from the blood to the dialysate. (3) Mechanical strength. The hollow fiber membrane has high mechanical strength and can withstand the flow pressure of blood and dialysate during dialysis, ensuring the safety and stability of the dialysis process. The design and material selection of the hollow fiber membrane are crucial to the performance of the hemodialyzer and directly affect the dialysis effect and the patient's treatment outcome.

[0004] Typical defects of hollow fiber membrane pores include three types: blocked pores, flat filaments, and residual glue. Blocked pores are mainly manifested by obvious cutting marks inside the pores, which are similar to the cutting texture outside the pores. Flat filaments are manifested by the flattening of the pore shape. Residual glue is mainly manifested by residual colloid on the inner wall of the pores, which is not completely blocked. The above three defects may lead to: (1) reduced dialysis efficiency and increased dialysis time. The effective dialysis surface area is reduced, and waste and excess fluid cannot be fully removed, resulting in the accumulation of toxins in the blood, and it takes longer to achieve the expected removal effect. (2) Increased blood flow resistance. Increased blood flow resistance in the dialyzer may cause cardiovascular complications. (3) Coagulation risk. Local blood retention and increased coagulation risk may lead to thrombosis.

[0005] At present, there are mainly the following methods for detecting the pores of the dialyzer hollow fiber membrane: (1) Microscope observation method, using an optical microscope or scanning electron microscope (SEM) to observe the microstructure and pore conditions of the hollow fiber membrane. This method has a limited observation range and is difficult to detect large areas or a large number of samples. In addition, the manual operation and equipment costs are high; (2) Pressure test method, by applying air pressure to the hollow fiber membrane, detecting the pressure of the bubbles emerging from the pores to determine the existence and size of the pores. This method can only detect the permeability of the pores and cannot identify other types of defects, such as flat fibers and residual glue. At the same time, it has high requirements for the detection environment and requires precise control of air pressure during the test. Utility Model Content

[0006] In order to solve the above problems, the utility model provides a hardware structure of a dialyzer hollow fiber membrane pore detection device, which is used to obtain pore images at both ends of the dialyzer hollow fiber membrane in a light source environment, providing a hardware basis for the detection of hollow fiber membrane pore quality.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A dialyzer hollow fiber membrane pore detection device, comprising the following:

[0009] An image acquisition mechanism, in a light environment, uses a camera and a lens to acquire images of the pores at both ends of the dialyzer hollow fiber membrane;

[0010] The motion control mechanism uses a transmission mechanism to drive the limiting groove to carry the dialyzer hollow fiber membrane along the conveyor belt. When the dialyzer hollow fiber membrane reaches the detection position, the dialyzer hollow fiber membrane is lifted to the photographing position by the lifting mechanism, and then the dialyzer hollow fiber membrane is driven to rotate circumferentially by the rotation mechanism to assist the image acquisition mechanism in rotating and photographing the dialyzer hollow fiber membrane.

[0011] A computer, used for receiving the pore images at both ends of the dialyzer hollow fiber membrane acquired by the image acquisition mechanism;

[0012] The computer is electrically connected to the image acquisition mechanism and the motion control mechanism.

[0013] Preferably, in the image acquisition mechanism, the dialyzer hollow fiber membrane is placed between two opposite light sources, and a pair of cameras are respectively set outside the two light sources, with the camera lenses facing the end face of the dialyzer hollow fiber membrane.

[0014] Preferably, the light source is mounted on the light source bracket via a movable slot to achieve vertical position adjustment of the light source, so that the light source is coaxial with the lens.

[0015] Preferably, the light source is a ring-shaped ultraviolet light source.

[0016] Preferably, the motion control mechanism further includes a pair of plastic splints, which are distributed on both sides of the dialyzer hollow fiber membrane and are jointly connected to the pneumatic mechanism for correcting the position of the dialyzer hollow fiber membrane before taking pictures.

[0017] The beneficial effects of the present invention are as follows: the present invention can identify tiny pore defects with high recognition accuracy by using a high-resolution camera, lens and light source system to capture images of hollow fiber membranes, thereby ultimately achieving efficient and accurate non-destructive testing of dialyzers; the present invention can quickly scan large-area samples and is suitable for real-time online testing on large-scale production lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the hardware structure of the utility model.

[0019] Figure 2 It is a side view of the hardware structure of the present invention.

[0020] In the figure, 1. camera, 2. lens, 3. light source bracket, 4. annular ultraviolet light source, 5. plastic splint, 6. limiting groove, 7. transmission mechanism, 8. pneumatic mechanism, 9. lifting mechanism, 10. rotating mechanism, 11. dialyzer hollow fiber membrane. DETAILED DESCRIPTION

[0021] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0022] like Figure 1 and Figure 2 The device for detecting pores of hollow fiber membranes of a dialyzer shown in the figure comprises three parts: an image acquisition mechanism, a motion control mechanism and a computer.

[0023] In the image acquisition mechanism, the dialyzer hollow fiber membrane 11 is placed between two light sources 4 arranged opposite to each other. The light source 4 adopts an annular ultraviolet light source. The annular ultraviolet light source has a short wavelength and weak penetrating power. The colloid material injected into both ends of the dialyzer is polyurethane glue. Ultraviolet light has weak permeability to polyurethane glue, but has a strong diffusion rate on the surface of polyurethane glue, which can highlight its texture and enhance the contrast between the polyurethane glue and the inner wall of the pores.

[0024] Furthermore, in the image acquisition mechanism, a pair of cameras 1 are respectively arranged outside the light source 4 on both sides, with the lens 2 of the camera 1 facing the end face of the dialyzer hollow fiber membrane 11. The camera 1 has a pixel of 1200W, a resolution of 4024*3036, a pixel size of 1.85μm*1.85μm, and a single pixel accuracy of 0.0036mm / pix, which meets the detection accuracy requirements. The corresponding field of view range is approximately 14.8mm*11.2mm;

[0025] Furthermore, in the image acquisition mechanism, the light source 4 is installed on the light source bracket 3 through a movable groove to achieve adjustable position of the light source 4 in the vertical direction, so that the light source 4 is coaxial with the lens 2; in the light environment, the camera 1 and the lens 2 are used to obtain the pore images at both ends of the dialyzer hollow fiber membrane 11 and form a data set.

[0026] In the motion control mechanism, the transmission mechanism is used to drive the limiting groove 6 to carry the dialyzer hollow fiber membrane 11 along the conveyor belt. When the dialyzer hollow fiber membrane 11 reaches the detection position, the lifting mechanism 9 is used to lift the dialyzer hollow fiber membrane 11 to the photographing position, and then the rotating mechanism 10 is used to drive the dialyzer hollow fiber membrane 11 to rotate circumferentially to assist the image acquisition mechanism to perform uniform rotation and photographing of the dialyzer hollow fiber membrane 11; the motion control mechanism also includes a pair of plastic splints 5, which are distributed on both sides of the dialyzer hollow fiber membrane 11 and are jointly driven and connected to the pneumatic mechanism 8 for positioning the dialyzer hollow fiber membrane 11 before photographing. Specifically, the pneumatic device 8 controls the plastic splints 5 to clamp the dialyzer hollow fiber membrane 11 for positioning, and then release it. By quickly clamping and releasing it twice, the positioning accuracy of the dialyzer hollow fiber membrane 11 is improved.

[0027] The computer includes an image preprocessing module, a detection module and a result display module, which are used to analyze and process the wire hole image data set obtained by the image acquisition mechanism and identify the defect area of ​​the wire hole image, wherein the image preprocessing module is used to roughly locate the membrane bundle edge of the dialyzer hollow fiber membrane 11, obtain the ROI area, and detect the ROI area; the detection module is used to input the roughly located ROI area into the neural network for reasoning and predict the category of each pixel; the result display module is used to display the results predicted by the detection module, mark the segmented defect area and count the defects.

[0028] A method for detecting pores in a dialyzer hollow fiber membrane comprises the following steps:

[0029] Step 1: Start the motion control mechanism and use the transmission mechanism to drive the limit groove 6 to carry the dialyzer hollow fiber membrane 11 along the conveyor belt. When the dialyzer hollow fiber membrane 11 reaches the detection position, the lifting mechanism 9 is used to lift the dialyzer hollow fiber membrane 11 to the photographing position. Before taking the photo, the pneumatic mechanism 8 is used to drive the plastic clamping plate 5 to clamp the two side end surfaces of the dialyzer hollow fiber membrane 11 to correct the position of the dialyzer hollow fiber membrane 11.

[0030] Step 2: Start the camera 1, lens 2, and light source 4 in the image acquisition mechanism. In the light environment, the dialyzer hollow fiber membrane 11 is driven to rotate circumferentially by the rotation mechanism 10. At the same time, the dialyzer hollow fiber membrane 11 is photographed using the camera 1 and lens 2 to obtain images of the pores at both ends of the dialyzer hollow fiber membrane 11 and form a data set.

[0031] Step 3: The data set of the pore image obtained in step 2 is transferred to the computer, and the image preprocessing module is used to roughly locate the membrane bundle edge of the dialyzer hollow fiber membrane 11, obtain the ROI area, and detect the ROI area; using the detection module, the roughly located ROI area is input into the neural network for reasoning, and the pore detection algorithm is used to predict the category of each pixel, and the defect position of the dialyzer hollow fiber membrane 11 is located and pixel-level segmented; using the result display module, the predicted results of the detection module are displayed, and the segmented defect area is marked and the defect count is performed;

[0032] Step 4: After the detection is completed, the lifting mechanism 9 is lowered, and the dialyzer hollow fiber membrane 11 falls on the limiting groove 6. The transmission mechanism is continued to drive the limiting groove 6 to carry the dialyzer hollow fiber membrane 11 along the conveyor belt.

Claims

1. A dialyzer hollow fiber membrane pore detection device, characterized in that These include: An image acquisition mechanism, in a light environment, uses a camera (1) and a lens (2) to acquire images of the pores at both ends of the dialyzer hollow fiber membrane (11); The motion control mechanism uses a transmission mechanism to drive the limiting groove (6) to carry the dialyzer hollow fiber membrane (11) along the conveyor belt. When the dialyzer hollow fiber membrane (11) reaches the detection position, the dialyzer hollow fiber membrane (11) is lifted to the photographing position by the lifting mechanism (9), and then the dialyzer hollow fiber membrane (11) is driven to rotate in the circumferential direction by the rotating mechanism (10) to assist the image acquisition mechanism in rotating and photographing the dialyzer hollow fiber membrane (11). A computer, used for receiving the pore images of the two ends of the dialyzer hollow fiber membrane (11) acquired by the image acquisition mechanism; The computer is electrically connected to the image acquisition mechanism and the motion control mechanism.

2. A dialyzer hollow fiber membrane pore detection device according to claim 1, characterized in that: In the image acquisition mechanism, the dialyzer hollow fiber membrane (11) is placed between light sources (4) arranged opposite to each other on both sides, and a pair of cameras (1) are respectively arranged outside the light sources (4) on both sides, so that the lenses (2) of the cameras (1) are directed towards the end face of the dialyzer hollow fiber membrane (11).

3. The dialyzer hollow fiber membrane pore detection device according to claim 2, characterized in that: The light source (4) is mounted on the light source bracket (3) via a movable slot to achieve vertical position adjustment of the light source (4), so that the light source (4) and the lens (2) are coaxial.

4. A dialyzer hollow fiber membrane pore detection device according to claim 2 or 3, characterized in that: The light source (4) is a ring-shaped ultraviolet light source.

5. The dialyzer hollow fiber membrane pore detection device according to claim 1, characterized in that: The motion control mechanism also includes a pair of plastic splints (5), which are distributed on both sides of the dialyzer hollow fiber membrane (11) and are jointly connected to the pneumatic mechanism (8) for driving and correcting the dialyzer hollow fiber membrane (11) before taking pictures.

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