An airtightness tester for medical catheter production

Abstract

The invention relates to an air tightness detector for medical catheter production in the field of air tightness detectors. The air tightness detector comprises a detection table, a vertical guide rail is fixedly connected to the side end of the detection table, a butt pipe is connected to the movable end of the vertical guide rail, a detection box is installed on the upper end of the detection table, a gas transmission pipe and an exhaust pipe are installed on the detection box, two test racks are installed inside the detection box, the test rack comprises a fixed beam, a plurality of pairs of clamping plates are rotatably connected to the fixed beam, a plurality of electromagnet blocks are fixedly connected to the fixed beam, and the electromagnet blocks are located between the pair of clamping plates, and permanent magnets and temperature sensing clamps are respectively connected to the two ends of the clamping plates; the two test racks are respectively located on the side inner wall and the bottom wall of the detection box; an infrared monitoring device is installed in the detection box, so that when a leakage point is detected, the leakage point can be temporarily closed, so that the detected leakage point does not affect the detection of other leakage points, and it is convenient to detect the leakage point on the entire pipeline.

Description

Technical Field

[0001] The invention relates to an air tightness detector for producing medical catheters, and in particular to an air tightness detector for producing medical catheters which is applied in the field of air tightness detectors. Background Art

[0002] Medical catheters are tube systems used in the medical field to deliver drugs, liquids or gases to specific parts of the human body. Catheters are usually made of soft materials, such as plastic or rubber, to facilitate insertion and use, and to reduce irritation to human tissue.

[0003] In order to solve the problem of catheter air tightness detection, a certain air tightness detector on the market adopts the design of observing whether bubbles appear in the catheter in the water, and has a certain market share.

[0004] The Chinese invention patent CN117091761A specification discloses a medical nasal catheter airtightness detection device, which is used to detect the airtightness of the nasal catheter body, including a base, a driving mechanism and a detection mechanism installed on the top of the base, the driving mechanism including four vertical poles fixedly installed on the top of the base and distributed in a rectangular shape, and a same fixing plate is slidably sleeved on the four vertical poles. When detecting the airtightness of the connection between the connecting hose and the nasal oxygen tube body, the invention first squeezes and deforms the connecting hose so that air cannot circulate in the connecting hose, and makes the two nasal plug head ports on the nasal oxygen tube body submerged in clear water, and then heats the nasal oxygen tube body. If bubbles emerge from the port of the nasal plug head immersed in clear water, it means that there is no gap at the connection between the surface connecting hose and the nasal oxygen tube body, and if no bubbles emerge, it indicates that there is a gap at the connection between the connecting hose and the nasal oxygen tube body.

[0005] Existing catheter air tightness testing instruments can only detect whether there are leaks when testing catheter air tightness, which is inconvenient for comprehensive leak detection of the catheter, and cannot mark the leaks during detection, making subsequent repairs and leak analysis inconvenient. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that most of the existing catheter air tightness detection instruments can only detect whether there are leakage points when detecting the air tightness of the catheter, which is inconvenient to perform comprehensive leakage point detection on the catheter, and cannot mark the leakage points during detection, which is inconvenient for subsequent repairs and leakage point generation analysis.

[0007] In order to solve the above problems, the present invention provides an air tightness detector for medical catheter production, comprising a detection table, a side end of the detection table is fixedly connected to a vertical guide rail, and a movable end of the vertical guide rail is connected to a butt pipe;

[0008] A test box is installed at the upper end of the test bench, a sealing cover is clamped on the test box, and semicircular threading holes are opened on the sealing cover and the test box. An air supply pipe and an exhaust pipe are installed on the test box. An induced draft fan connected to the air supply pipe is installed at the lower end of the test bench, and a refrigeration device is installed on the induced draft fan. Two test racks are installed inside the test box, and the test racks include a fixed beam, and multiple pairs of clamps are rotatably connected to the fixed beam. Multiple electromagnet blocks are fixedly connected to the fixed beam, and the electromagnet blocks are located between a pair of clamps. Permanent magnets and temperature-sensitive clamps are connected to both ends of the clamps respectively; the two test racks are respectively located on the side inner wall and bottom wall of the test box;

[0009] An infrared monitoring device is installed in the detection box, and the infrared monitoring device includes a horizontal guide rail, and an infrared image acquisition device is installed at the movable end of the horizontal guide rail;

[0010] A pair of traction wheels are arranged between the butt-jointed pipe and the detection box, and a motor matching the traction wheels is installed on the detection table.

[0011] In the above-mentioned air tightness detector for medical catheter production, when a leak point is detected, the leak point can be temporarily sealed so that the detected leak point does not affect the detection of other leak points, thereby facilitating the detection of leak points on the entire pipeline.

[0012] As a further improvement of the present application, the temperature-sensing clip includes a base film covering the clamping end of the temperature-sensing clip, and a plurality of temperature-sensing units are arranged on the base film.

[0013] As a further improvement of the present application, the clamps on two adjacent test frames are staggered, and the axial spacing between two adjacent clamps is 1-3 mm.

[0014] As a further improvement of the present application, the butt-joint pipe includes a corrugated hose, the output end of the butt-joint pipe is connected to a constant pressure output valve, and the output end of the constant pressure output valve is installed with an electromagnetic opening and closing valve.

[0015] As another improvement of the present application, a pair of cylinders are installed at the upper end of the test bench, the power output ends of the cylinders are connected to the housing of the motor, and a rubber ring is laid on the traction wheel, and the cross-section of the rubber ring is a hollow trapezoid.

[0016] As another improved supplement of the present application, a mounting groove is installed on the inner wall of the semicircular threading hole, a sealing ring is slidably connected in the mounting groove, a small electromagnet matching the sealing ring is installed in the mounting groove, and a magnet sheet is installed in the sealing ring.

[0017] As another improvement of the present application, an airtight detection system is also included, the airtight detection system includes a processor installed on a detection table, the processor is connected to a control module, a monitoring module and an image recognition module, an ambient temperature sensor is installed in the detection box, and the ambient temperature sensor, an infrared image acquisition device and a temperature sensing clip are all connected to the monitoring module signal;

[0018] A circulating induced draft fan connected to the control module is arranged outside the detection box, and a refrigeration device is installed at the output end of the circulating induced draft fan; the motor, induced draft fan, infrared monitoring equipment and test stand are all connected to the control module.

[0019] As another improvement of the present application, a marking device connected to the control module is installed at the output end of the detection box, and the marking device includes a transverse guide rail, a marking nozzle is installed at the movable end of the transverse guide rail, and an ink cartridge is installed on the marking nozzle.

[0020] As another improvement of the present application, a marking module is provided on the processor, and the positioning information of each clamp is recorded in the marking module. When the temperature-sensing clamp detects a local temperature abnormality on the catheter, the marking module records the positioning information of the clamp with reference to mark the leakage point. During the catheter output process, when the leakage point moves to the marking device, the marking device is controlled to spray and mark the leakage point.

[0021] In summary, this solution can temporarily seal off a leak point when it is detected, so that the detected leak point does not affect the detection of other leak points. During detection, the leak point on the catheter is accurately located by comparing and verifying the temperature measurement unit and the infrared image, and it is easy to mark the leak point on the entire catheter, which is convenient for catheter repair and damage analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-dimensional diagram of the first embodiment of the present application;

[0023] Figure 2 This is a three-dimensional diagram of the first embodiment of the present application with the sealing cover removed;

[0024] Figure 3 for Figure 2 The structural diagram at A in the middle;

[0025] Figure 4 This is a front cross-sectional view of the first embodiment of the present application;

[0026] Figure 5 for Figure 4 The structural diagram at B in the middle;

[0027] Figure 6 This is a working change diagram of the first embodiment of the present application when the splint clamps the catheter;

[0028] Figure 7 This is a system block diagram of the first and second implementation modes of this application;

[0029] Figure 8 It is a side cross-sectional view of the first and second embodiments of the present application;

[0030] Fig. 9for Figure 8 The structural diagram at C in the middle;

[0031] Fig.10 This is a diagram of the working process changes of the second implementation method of this application.

[0032] Description of the numbers in the figure:

[0033] 1 testing table, 2 vertical guide rails, 3 butt pipes, 4 testing boxes, 401 sealing rings, 402 small electromagnets, 5 testing frames, 501 fixed beams, 502 clamps, 503 electromagnet blocks, 504 temperature-sensitive clips, 6 infrared monitoring equipment, 7 traction wheels, 8 marking equipment. DETAILED DESCRIPTION

[0034] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0035] The first implementation method:

[0036] Figure 1 It is shown that an air tightness tester for the production of medical catheters includes a test table 1, the side end of the test table 1 is fixedly connected to a vertical guide rail 2, and the movable end of the vertical guide rail 2 is connected to a docking tube 3; the docking tube 3 includes a corrugated hose, and the output end of the docking tube 3 is connected to a constant pressure output valve, and the output end of the constant pressure output valve is installed with an electromagnetic opening and closing valve. The constant pressure output valve is set to ensure that there is sufficient pressure in the catheter before the filled fluid can be discharged, so as to ensure that the filled fluid can be quickly discharged from the leakage point of the catheter.

[0037] A test box 4 is installed at the upper end of the test bench 1, and a sealing cover is clamped on the test box 4. Semicircular threading holes are provided on the sealing cover and the test box 4. An air supply pipe and an exhaust pipe are installed on the test box 4. An induced draft fan connected to the air supply pipe is installed at the lower end of the test bench, and a refrigeration device is installed on the induced draft fan. Two test racks 5 are installed inside the test box 4. The test racks 5 include a fixed beam 501, and multiple pairs of clamps 502 are rotatably connected to the fixed beam 501. Multiple electromagnet blocks 503 are fixedly connected to the fixed beam 501, and the electromagnet blocks 503 are located between a pair of clamps 502. Permanent magnets and temperature-sensing clips 504 are connected to both ends of the clamps 502 respectively; the two test racks 5 are respectively located on the side inner wall and the bottom wall of the test box 4; the temperature-sensing clip 504 includes a base film covering the clamping end of the temperature-sensing clip 504, and multiple temperature-sensing units are arranged on the base film.

[0038] The clamping plates 502 on the two test frames 5 are used to clamp the upper and lower ends and the left and right ends of the catheter respectively;

[0039] The clamping plates 502 on two adjacent test frames 5 are staggered, and the axial spacing between two adjacent clamping plates 502 is 1-3 mm.

[0040] An infrared monitoring device 6 is installed in the detection box 4. The infrared monitoring device 6 includes a horizontal rail. An infrared image acquisition device is installed at the movable end of the horizontal rail to collect infrared temperature images of the catheter surface. The infrared image acquisition device is used to monitor whether the catheter surface temperature is high to avoid the temperature of the catheter being close to the temperature of the input fluid, which makes it difficult for the temperature-sensitive clip 504 to detect the leakage point based on the temperature difference.

[0041] A pair of traction wheels 7 are provided between the butt joint pipe 3 and the detection box 4, and a motor matching the traction wheels 7 is installed on the detection platform 1. A pair of cylinders are installed on the upper end of the detection platform 1, and the power output end of the cylinder is connected to the housing of the motor. A rubber ring is laid on the traction wheel 7, and the cross section of the rubber ring is a hollow trapezoid. In this scheme, when the traction wheel 7 works normally, the conduit is delivered to the butt joint pipe 3. When testing the elastic conduit, the cylinder can also be controlled to work so that the pair of traction wheels 7 squeeze the conduit, so that the airflow of the conduit delivered to the butt joint pipe 3 is reduced, so as to increase the leakage of the conduit with a leakage hole in the detection box 4, so that the temperature-sensitive clip 504 can more easily detect the leaking high-temperature airflow.

[0042] An installation groove is installed on the inner wall of the semicircular threading hole, a sealing ring 401 is slidably connected in the installation groove, a small electromagnet 402 matching the sealing ring 401 is installed in the installation groove, and a magnet sheet is installed in the sealing ring 401.

[0043] It also includes an airtight detection system, which includes a processor installed on the detection platform 1, and the processor is connected to a control module, a monitoring module and an image recognition module. An ambient temperature sensor is installed in the detection box 4, and the ambient temperature sensor, an infrared image acquisition device and a temperature sensing clip 504 are all connected to the monitoring module signal; the motor, the induced draft fan, the infrared monitoring equipment 6 and the test frame 5 are all connected to the control module.

[0044] When this solution is used, one end of the tube to be tested is connected to 3 and closed, and fluid is filled into the tube to be tested. While the fluid is being filled, the tube to be tested is led into the test box. When the test box passes through the test box, the temperature sensing unit at the test clamp monitors whether there is a gas leak on the pipeline.

[0045] When the scheme is working, the butt joint pipe 3 is first connected to one end of the tube to be tested, and then the tube to be tested is input into the test box 4. When the tube to be tested is input into the test box 4, it is input in sections, and each time a set length of the tube is input into the test box 4. After the tube input into the test box 4 is fixed, the gas environment temperature in the test box 4 is detected. If the gas environment temperature is unqualified, the test box 4 is ventilated to reduce the temperature in the test box 4 to the set value, so that the surface temperature of the tube in the test box 4 is cooled;

[0046] After the two ends of the detection box 4 are sealed, hot fluid is introduced into the conduit to make the fluid flow in the conduit. At this time, the temperature sensing clip 504 is used to monitor whether there is air leakage on the surface of the tube body. When there is a local air leakage, the temperature measured by the temperature sensing clip 504 at the leakage position is different from the temperature measured by the temperature sensing clip 504 at other positions.

[0047] At this time, the infrared monitoring device 6 moves to the temperature-sensitive clip 504 and collects infrared images to assist in confirming whether the detected leakage point is valid. When the infrared image shows that the surface temperature of the duct is close to the temperature of the hot fluid, it is determined that the detected leakage point is invalid. At this time, the induced draft fan is controlled to input cold air flow to cool the duct surface, so that the duct surface temperature drops to the set value, and then the test is repeated;

[0048] Optionally, when the temperature difference is measured, the pair of temperature-sensing clips 504 at the position can be controlled to clamp the conduit so that the temperature-sensing clips 504 fit the leakage point. At this time, the temperature measurement of the pair of temperature-sensing clips 504 is monitored again. By comparing the local temperature difference monitored by the pair of temperature-sensing clips 504, the leakage point is determined. At this time, the leakage is first covered. If there are other leakage points on the conduit, the leakage amount of the other leakage points increases, which facilitates the temperature-sensing clips 504 at the gas position to monitor the leakage;

[0049] After the leak point is determined, the location of the leak point area is marked. After the test, the catheter is pulled by a set distance so that the area on the catheter corresponding to the clamping plate 502 on one test frame 5 is moved to the corresponding clamping plate 502 on another test frame 5, so that the upper and lower ends and the left and right ends of the segment of the catheter located in the test box 4 are monitored by the clamping plate 502 during the test.

[0050] After the catheter segment is fully tested, the catheter segment is output from the testing box 4, so that the next catheter segment enters the testing box 4;

[0051] During the detection process of this embodiment, the detection box 4 is ensured to be at a low temperature or normal temperature environment, and a hot air flow is output to the detected conduit, so that when the conduit segment located in the detection box 4 leaks air flow, the leakage point is located by the temperature-sensitive clip 504 arranged around the guide rail, and when the leakage point is found, the leakage point can be temporarily closed by the clamping plate 502 to facilitate the continued detection of other smaller leakage points, thereby facilitating the comprehensive detection of leakage points on the conduit.

[0052] Second implementation method:

[0053] Figure 7 and Fig.10 As shown, a marking device 8 connected to the control module is installed at the output end of the detection box 4, and the marking device 8 includes a transverse guide rail, a marking nozzle is installed at the movable end of the transverse guide rail, and an ink cartridge is installed on the marking nozzle.

[0054] A marking module is provided on the processor, and the positioning information of each clamp 502 is recorded in the marking module. The positioning information includes the coverage range of the temperature-sensing clamp 504. Specifically, a more accurate positioning range can be determined according to the position of the temperature-sensing unit with the highest detected temperature on the temperature-sensing clamp 504. When the temperature-sensing clamp 504 detects a local temperature abnormality on the catheter, the marking module records the positioning information of the clamp 502 as a reference to mark the leakage point, and a certain range of areas can be marked. During the catheter output process, when the leakage point moves to the marking device 8, the marking device 8 is controlled to spray the marked leakage point. During the spraying, only the upper part of the catheter is sprayed. The annular area corresponding to the marked position on the surface contains the leakage point, which is convenient for using sealing tape to repair the annular area to close the leakage point.

[0055] When the catheter segment to be tested is output, the leaking point is sprayed and marked by the marking device 8; then the leaking point is covered and sealed with a sealing tape, and then the next segment is tested.

[0056] Compared with existing detection equipment, this solution can temporarily seal the leak point when a leak is detected, so that the detected leak point does not affect the detection of other leak points. During detection, the temperature measurement unit and infrared image comparison and verification are used to ensure accurate positioning of the leak point on the catheter, and it is easy to mark the leak point on the entire catheter, which is convenient for catheter repair and damage analysis.

[0057] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. An air tightness detector for medical catheter production, characterized in that: The invention comprises a testing platform (1), wherein a side end of the testing platform (1) is fixedly connected to a vertical guide rail (2), and a movable end of the vertical guide rail (2) is connected to a butt joint pipe (3); the butt joint pipe (3) comprises a corrugated hose, and an output end of the butt joint pipe (3) is connected to a constant pressure output valve, and an electromagnetic opening and closing valve is installed at the output end of the constant pressure output valve; The upper end of the test bench (1) is provided with a test box (4), a sealing cover is clamped on the test box (4), and semicircular threading holes are provided on the sealing cover and the test box (4). An air supply pipe and an exhaust pipe are provided on the test box (4). An induced draft fan connected to the air supply pipe is provided at the lower end of the test bench (1), and a refrigeration device is provided on the induced draft fan. Two test racks (5) are provided inside the test box (4), and the test racks (5) include a fixed beam (501), and a rotating shaft (501) is provided on the fixed beam (501). A plurality of pairs of clamping plates (502) are dynamically connected, a plurality of electromagnet blocks (503) are fixedly connected to the fixed beam (501), and the electromagnet blocks (503) are located between the pair of clamping plates (502), and both ends of the clamping plates (502) are respectively connected to permanent magnets and temperature-sensitive clamping plates (504); the two test frames (5) are respectively located on the side inner wall and the bottom wall of the detection box (4); the temperature-sensitive clamping plate (504) comprises a base film covering the clamping end of the temperature-sensitive clamping plate (504), and a plurality of temperature-sensing units are arranged on the base film; An infrared monitoring device (6) is installed in the detection box (4), and the infrared monitoring device (6) comprises a horizontal guide rail, and an infrared image acquisition device is installed at the movable end of the horizontal guide rail; A pair of traction wheels (7) are provided between the butt joint pipe (3) and the detection box (4), and an electric motor matching the traction wheels (7) is installed on the detection platform (1).

2. The air tightness detector for medical catheter production according to claim 1, characterized in that: The clamping plates (502) on two adjacent test frames (5) are arranged in a staggered manner, and the axial spacing between the two adjacent clamping plates (502) is 1-3 mm.

3. The air tightness detector for medical catheter production according to claim 2, characterized in that: A pair of cylinders are installed at the upper end of the detection platform (1), the power output ends of the cylinders are connected to the outer shell of the motor, and a rubber ring is laid on the traction wheel (7), and the cross-section of the rubber ring is a hollow trapezoid.

4. The air tightness detector for medical catheter production according to claim 3, characterized in that: An installation groove is installed on the inner wall of the semicircular threading hole, a sealing ring (401) is slidably connected in the installation groove, a small electromagnet (402) matching the sealing ring (401) is installed in the installation groove, and a magnet sheet is installed in the sealing ring (401).

5. The air tightness detector for medical catheter production according to claim 4, characterized in that: It also includes an airtightness detection system, the airtightness detection system including a processor installed on the detection platform (1), the processor being connected to a control module, a monitoring module and an image recognition module, an ambient temperature sensor being installed in the detection box (4), the ambient temperature sensor, the infrared image acquisition device and the temperature sensing clip (504) being all connected to the monitoring module signal; the motor, the induced draft fan, the infrared monitoring device (6) and the test stand (5) being all connected to the control module.

6. The air tightness detector for medical catheter production according to claim 5, characterized in that: The output end of the detection box (4) is equipped with a marking device (8) connected to the control module, the marking device (8) comprising a transverse guide rail, a marking nozzle being installed at the movable end of the transverse guide rail, and an ink cartridge being installed on the marking nozzle.

7. The air tightness detector for medical catheter production according to claim 6, characterized in that: The processor is provided with a marking module, wherein the positioning information of each clamp (502) is recorded in the marking module. When the temperature sensing clamp (504) detects a local temperature abnormality on the catheter, the marking module records the positioning information of the clamp (502) and marks the leakage point. During the catheter output process, when the leakage point moves to the marking device (8), the marking device (8) is controlled to spray and mark the leakage point.

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