Medical needle tube rigidity and toughness detector

Abstract

The utility model relates to needle tube detector technical field, and disclose a kind of medical needle tube rigidity and toughness detector, including tester and two threaded mounting plate, the top outer surface of support shaft is fixedly connected with L-shaped fixed plate, the outer surface of support shaft is fixedly sleeved with limit disc, the outer surface of limit disc is equipped with two limit holes being symmetrically arranged, the outer surface of vertical board movably inserts movable rod, the side of connecting plate towards limit disc is fixedly connected with positioning rod, the positioning rod movably inserts in the inside of limit hole, spring is fixedly connected between connecting plate and vertical board, when needing to adjust the installation position of L-shaped fixed plate, cooperate movable rod, positioning rod spring and limit hole, the limit of limit disc is carried out, thereby the limit of support shaft is carried out, the orientation of L-shaped fixed plate is adjusted, thereby the orientation of L-shaped fixed plate is adjusted, and it is convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of needle tube testing technology, specifically a medical needle tube rigidity and toughness testing instrument. Background Technology

[0002] In clinical medical procedures, medical needles are core instruments for drug infusion, blood collection, and body fluid extraction. Their mechanical properties directly affect the safety, ease of use, and patient experience. Rigidity and toughness are key indicators of needle quality: insufficient rigidity can cause the needle to bend or deform during puncture, increasing the difficulty for medical staff and potentially leading to vascular damage, puncture failure, or drug leakage; poor toughness makes the needle prone to breakage under impact. Therefore, medical needles must undergo rigidity and toughness testing before leaving the factory.

[0003] In existing technology, a specified force is applied to the center of a needle tube that is supported and fixed at both ends using a push rod device. The deflection value of the needle tube is measured to evaluate its rigidity. Alternatively, one end of the needle tube is fixed, and a force is applied to the needle tube from the fixed point to a specified span, first in one direction and then in the opposite direction at a specified angle. This bending is repeated a specified number of times, and the needle tube's breakage is visually inspected to evaluate its toughness. Because the fixing devices at both ends of the needle tube need to be symmetrically arranged during the rigidity test (as shown in the attached figure), this method is necessary. Figure 3 As shown in the figure, to ensure that both ends of the needle tube are subjected to force simultaneously, when conducting the toughness test, only one end of the needle tube needs to be fixed. It is necessary to adjust the distance between the fixing device on one side and the 0 mark to be equal to the test span of the tube. However, it is possible that when the fixing device on one side is adjusted to the maximum distance, the distance is still less than the test span. Therefore, it is necessary to rotate the fixing device on one side 180 degrees for testing. In the existing technology, it is necessary to unscrew the screw, rotate the fixing device 180 degrees, and then screw in the screw to fix the fixing device. This method of disassembly and installation is relatively cumbersome. Therefore, a medical needle tube rigidity and toughness testing instrument is proposed. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a medical needle rigidity and toughness tester to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a medical needle rigidity and toughness testing instrument, comprising a testing instrument and two threaded mounting plates. A support shaft is rotatably connected to the top outer surface of the threaded mounting plate. An L-shaped fixing plate is fixedly connected to the top outer surface of the support shaft. A limiting disc is fixedly sleeved on the outer surface of the support shaft. Two symmetrically arranged limiting holes are opened on the outer surface of the limiting disc. A vertical plate is fixedly connected to the top outer surface of the threaded mounting plate. A movable rod is movably inserted into the outer surface of the vertical plate. A connecting plate is fixedly connected to the outer surface of the movable rod. A positioning rod is fixedly connected to the side of the connecting plate facing the limiting disc. The positioning rod is movably inserted into the limiting hole. A spring is fixedly connected between the connecting plate and the vertical plate. The spring is sleeved on the outer surface of the movable rod.

[0006] Furthermore, an electric push rod is mounted on the front outer surface of the tester, and a columnar push rod is fixedly mounted on the output end of the electric push rod.

[0007] Furthermore, an adjustment platform is fixedly connected to the top outer surface of the front side of the tester body. Two support blocks are fixedly connected to the top outer surface of the adjustment platform. A positive and negative lead screw is rotatably connected between the two support blocks. The outer surfaces of the two threaded mounting plates are threaded onto the outer surfaces of the positive and negative lead screws. A knob is fixedly connected to the outer surface of the positive and negative lead screws.

[0008] Furthermore, the top outer surface of the L-shaped fixing plate is provided with a groove for accommodating a medical needle tube.

[0009] Furthermore, a T-shaped fixing block is provided on the top outer surface of the L-shaped fixing plate. The vertical section of the T-shaped fixing block cooperates with the groove to fix the medical needle tube. An adjusting bolt is threaded through the outer surface of the T-shaped fixing block. Two screw holes are opened on the top outer surface of the L-shaped fixing plate. The other end of the adjusting bolt is connected to the internal thread of the screw hole.

[0010] Furthermore, the bottom of the columnar push rod is conical, and the outer surface of the columnar push rod has a through hole for accommodating a medical needle tube.

[0011] Furthermore, two slide rods are fixedly connected between the two support blocks, and the two threaded mounting plates are movably sleeved on the outside of the two slide rods.

[0012] Furthermore, the front outer surface of the adjustment platform is provided with scale lines, and the conical shape of the columnar push rod corresponds to the scale.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This medical needle rigidity and toughness testing instrument, when it is necessary to adjust the installation position of the L-shaped fixing plate, uses the movable rod, positioning rod spring and limiting hole to limit the limiting plate, thereby limiting the support shaft and adjusting the orientation of the L-shaped fixing plate, making it easy to adjust the orientation of the L-shaped fixing plate and convenient to use. Attached Figure Description

[0015] Figure 1 This is a front view structural diagram of the present invention;

[0016] Figure 2 This is a frontal sectional view of the present invention.

[0017] Figure 3 This is a schematic diagram of the adjustment platform and related structures of this utility model;

[0018] Figure 4 This is an exploded view of the threaded mounting plate and L-shaped fixing plate of this utility model;

[0019] Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle;

[0020] Figure 6 This is a schematic diagram of the structure of the L-shaped fixing plate of this utility model when installed in another direction;

[0021] Figure 7 This is a schematic diagram of the columnar push rod structure of this utility model;

[0022] Figure 8 This is a schematic diagram of the structure during rigidity testing of this utility model;

[0023] Figure 9 This is a schematic diagram of the structure used in the toughness test of this utility model.

[0024] In the diagram: 1. Tester; 2. Threaded mounting plate; 3. Support shaft; 4. Limiting plate; 5. Limiting hole; 6. Vertical plate; 7. Movable rod; 8. Positioning rod; 9. Spring; 10. L-shaped fixing plate; 11. T-shaped fixing block; 12. Adjusting bolt; 13. Groove; 14. Positive and negative lead screw; 15. Knob; 16. Adjusting platform; 17. Electric push rod; 18. Columnar push rod; 19. Through hole. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please refer to the following: Figures 1-9 This utility model provides a technical solution: a medical needle rigidity and toughness testing instrument, including a testing instrument 1 and two threaded mounting plates 2. A support shaft 3 is rotatably connected to the top outer surface of the threaded mounting plate 2. An L-shaped fixing plate 10 is fixedly connected to the top outer surface of the support shaft 3. A limiting plate 4 is fixedly sleeved on the outer surface of the support shaft 3. Two symmetrically arranged limiting holes 5 are opened on the outer surface of the limiting plate 4. A vertical plate 6 is fixedly connected to the top outer surface of the threaded mounting plate 2. A movable rod 7 is movably inserted into the outer surface of the vertical plate 6. A connecting plate is fixedly connected to the outer surface of the movable rod 7. A positioning rod 8 is fixedly connected to the side of the connecting plate facing the limiting plate 4. The positioning rod 8 is movably inserted into the limiting hole 5. A spring 9 is fixedly connected between the connecting plate and the vertical plate 6. The spring 9 is sleeved on the outer surface of the movable rod 7. Specifically, when the movable rod 7 is pulled, the movable rod 7 drives the positioning rod 8 to disengage from the limiting hole 5, releasing the limiting plate 4, thereby allowing the support shaft 3 to rotate and rotate the L-shaped fixing plate 10 180°. Then, when the force applied to the movable rod 7 is stopped, the positioning rod 8 is driven by the spring 9 to insert into the limiting hole 5, limiting the limiting plate 4, thereby limiting the L-shaped fixing plate 10, so that one side of the right L-shaped fixing plate 10 has more room to move.

[0027] It is worth noting that the tester 1 is equipped with a human-machine interactive display screen and report printing function.

[0028] Furthermore, an electric push rod 17 is installed on the front outer surface of the tester 1, and a columnar push rod 18 is fixedly installed at the output end of the electric push rod 17. Specifically, the electric push rod 17 drives the columnar push rod 18 to move, thereby performing rigidity or toughness testing on the medical needle tube.

[0029] Furthermore, an adjustment platform 16 is fixedly connected to the top outer surface of the front side of the tester 1 body. Two support blocks are fixedly connected to the top outer surface of the adjustment platform 16. A positive and negative screw 14 is rotatably connected between the two support blocks. The outer surfaces of the two threaded mounting plates 2 are threaded onto the outer surfaces of the positive and negative screw 14. A knob 15 is fixedly connected to the outer surface of the positive and negative screw 14. Specifically, rotating the knob 15 causes the positive and negative screw 14 to rotate, so that the distance from the edge line of the L-shaped fixing plate 10 to the scale line is the tube test span.

[0030] Furthermore, the top outer surface of the L-shaped fixing plate 10 is provided with a groove 13 for accommodating the placement of a medical needle tube. Specifically, when fixing the medical needle tube, the medical needle tube is first placed on the groove 13.

[0031] Furthermore, a T-shaped fixing block 11 is provided on the top outer surface of the L-shaped fixing plate 10. The vertical section of the T-shaped fixing block 11 cooperates with the groove 13 to fix the medical needle tube. An adjusting bolt 12 is threaded through the outer surface of the T-shaped fixing block 11. Two screw holes are opened on the top outer surface of the L-shaped fixing plate 10. The other end of the adjusting bolt 12 is connected to the internal thread of the screw hole. Specifically, tightening the adjusting bolt 12 causes the adjusting screw to move downward in the screw hole, thereby causing the T-shaped fixing block 11 to move downward, so that the T-shaped fixing block 11 fixes the needle tube on the L-shaped fixing plate 10, so that the needle tube cannot move left or right.

[0032] Furthermore, the bottom of the columnar push rod 18 is conical, and the outer surface of the columnar push rod 18 is provided with a through hole 19 to accommodate the passage of a medical needle. Specifically, when performing rigidity testing, the conical shape of the columnar push rod 18 facilitates the downward pressing of the columnar push rod, so that the conical shape applies force to the needle for rigidity testing. When performing toughness testing, the medical needle is passed through the through hole 19, and as the columnar push rod 18 moves up and down, the toughness of the medical needle is tested.

[0033] Furthermore, two slide rods are fixedly connected between the two support blocks, and two threaded mounting plates 2 are movably sleeved on the outside of the two slide rods. Specifically, when the positive and negative screws 14 rotate, the threaded mounting plates 2 slide on the outer surface of the slide rods, thereby making the threaded mounting plates 2 move stably in a straight line.

[0034] Furthermore, the front outer surface of the adjustment table 16 is provided with scale lines, and the conical shape of the columnar push rod 18 corresponds to the scale. Specifically, the position of the L-shaped fixing plate 10 is determined by the scale lines. During the rigidity test, the distance between the edges of the two L-shaped fixing plates 10 and the 0 scale is half of the needle tube test span. For example, if the test span is 25mm, the distance is 12.5mm. During the toughness test, the distance between the edge line of the right L-shaped fixing plate 10 and the scale line is the tube test span. For example, if the test span is 50mm, the distance is 50mm.

[0035] Working principle: When using this utility model for rigidity testing, the medical needle is fixed. During fixation, the needle is passed from right to left above the two L-shaped fixing plates 10. The knob 15 is rotated, which drives the positive and negative screws 14 to rotate. The positive and negative screws 14 drive the two threaded mounting plates 2 to move. The distance between the two L-shaped fixing plates 10 is adjusted so that the distance between the edge of the two L-shaped fixing plates 10 and the 0 mark is half of the needle test span. For example, if the test span is 25mm, the distance is 12.5mm. The needle is moved back and forth so that it is located directly below the center line of the columnar push rod 18. The adjusting bolt 12 is tightened, which moves the T-shaped fixing block 11 downward, fixing the needle on the L-shaped fixing plate 10 so that the needle cannot move left or right. The columnar push rod 18 is moved downward by the electric push rod 17 to perform the rigidity test on the needle.

[0036] The following are the steps for using the testing instrument to perform rigidity tests:

[0037] On the main page, enter the needle outer diameter in the corresponding field and click to select the needle wall type (normal / thin / ultra-thin);

[0038] Enter the test span and load (bending force) and other test parameters in the corresponding fields on the test parameter page (in the red box).

[0039] "Push rod test speed": 1 mm / min (0.017 mm / s) as required by the standard, and generally should not be changed.

[0040] Other test parameters (not in the red box): generally use the default values;

[0041] Press and hold the "Up" or "Down" button on the main page to bring the lower end of the push rod as close as possible to the syringe (ensuring the current push force is not greater than zero). Then, enter the test parameters page and long-press the "Write Position" button to write the "Current Push Rod Position" value (highlighted in red) from the main page into the "Push Rod Starting Position" field on the test parameters page, or click the "Push Rod Starting Position" field to enter the corresponding data. Default values ​​are generally used.

[0042] When the syringe is not installed (recommended), clicking the "Starting Position" button will return the plunger to the "Pusher Starting Position".

[0043] After more than 10 normal rigidity tests or when the test ends abnormally (e.g., when the push rod moves and the "stop" button is pressed), it is recommended to click the "return to origin" button to return the push rod to its original position (the top of the rise).

[0044] The data in the "Deflection Start Force Measurement Value" column generally uses the default value;

[0045] After completing the above preparations, click the "Experiment" button on the main page to start the test.

[0046] During the test, the push rod descends at a set rate and contacts the needle tube. The test ends when the applied push force (bending force) reaches the specified force value.

[0047] The test is now complete. The system will automatically fill the measured needle deflection value into the test table. Click the "Query" button on the main page to access the test data table and view the test results.

[0048] Press the "Stop" button to return to the initial state. During the test, please follow the prompts in the "Test Information" section. Pressing the "Stop" button during the test will terminate the test.

[0049] Click the "Settings" button on the main page to enter the settings page. This page contains all the relevant operating parameters for the test run, which can be adjusted according to the specifications of the test syringe.

[0050] Click the "Query" button on the main page to enter the test data table page. Enter the ambient temperature and other data, and click to select the test "Judgment Result" (Pass / Fail). When the "Deflection Value after Test" is less than or equal to the "Maximum Deflection" value, the "Judgment Result" is "Pass". Click "Print Report" to print the test data report.

[0051] During the toughness test, the needle is passed through the right-side L-shaped fixing block and through the through hole (19) of the columnar push rod (18). The knob (15) is rotated, which drives the forward and reverse screws (14) to rotate, so that the distance from the edge line of the right-side L-shaped fixing plate (10) to the scale line is the tube test span. For example, if the test span is 50mm, the distance is 50mm. When the distance is adjusted to the maximum and is still less than the test span, the movable rod (7) is pulled. The movable rod (7) drives the positioning rod (8) to disengage from the inside of the limiting hole (5). Release the limiting plate (4) to allow the support shaft (3) to rotate, rotate the L-shaped fixing plate (10) 180°, and then stop applying force to the moving rod (7). The spring (9) drives the positioning rod (8) to insert into the limiting hole (5) to limit the limiting plate (4), thereby limiting the L-shaped fixing plate (10) and giving the right side of the L-shaped fixing plate (10) more room to move. Pull back the electric push rod (17) to pull the medical needle tube for toughness testing. The following are the steps for using the tester to test toughness:

[0052] On the main page, enter the needle outer diameter in the corresponding field and click to select the needle wall type (normal / thin / ).

[0053] For ultra-thin needles, enter the test span and other test parameters in the corresponding fields on the test parameters page. The test parameters need to be adjusted according to the needle's outer diameter and wall type.

[0054] The default values ​​are used for "Number of push-pull operations" and "Jig speed".

[0055] Pull-up speed and push-down speed: These determine the lifting and lowering speed of the push rod during the test. During the test, you can observe the changes in the "Test Push-Pull Timing" monitoring value on the main page. It should reach about 2 seconds / cycle (0.5Hz) as required. If it is too high or too low, you need to adjust the pull-up or push-down speed value.

[0056] "Push start position": The current position of the push rod is taken as the push start position at the start of the test.

[0057] Before testing, it is necessary to adjust and determine the "starting position of the push rod", "pull-up speed", and "pull-down speed".

[0058] If the needle being tested is a different model than the one used last time, first remove the needle and measure the push-pull frequency under no-load conditions.

[0059] Enter the test parameters page, long press the "Write Position" button to write the "Current Position of Push Rod" value from the main page into the "Starting Position of Push Rod" field on the test parameters page, or click the "Starting Position of Push Rod" field to enter the "Current Position of Push Rod" value.

[0060] After setting different stretching / pulling speeds, click the "Stretch Position," "Start Position," and "Pushing Position" buttons on the main page, and simultaneously observe the "Test Push-Pull Timer." Keep the "Test Push-Pull Timer" at approximately "2 seconds / cycle" during stretching or pushing. This corresponds to the standard requirement of a test frequency of 0.5Hz.

[0061] Reinstall the syringe after the test is complete. If using the same model syringe or if the stretching / pushing speed has been determined, this step can be skipped.

[0062] Tighten the right T-shaped fixing block to prevent the syringe from moving left or right;

[0063] After completing the above preparations, click the "Experiment" button on the main page to start the test.

[0064] During the test, the push rod pulls the push-down needle tube at a certain frequency (0.5Hz) and bending angle. The test ends when the specified number of tests is reached.

[0065] The experiment is now complete. The visually assessed results of the syringe test are systematically entered into the experiment form. Click the "Query" button on the main page to access the experiment data table and view the results.

[0066] Press the "Stop" button to return to the initial state. During the test, please follow the prompts in the "Test Information" section. Pressing the "Stop" button during the test will terminate the test.

[0067] Click the "Settings" button on the main page to enter the settings page. This page displays the relevant operating parameters for the test run, which can be adjusted according to the specifications of the test syringe.

[0068] Click the "Query" button on the main page to enter the test data table page. Enter the ambient temperature and other data, click to select "Post-test syringe condition" (normal / bent / broken / other), and click to select "Judgment result" (pass / fail).

[0069] Click "Print Report" to print the test data report.

[0070] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A medical needle tube rigidity and toughness testing instrument, comprising a testing instrument (1) and two threaded mounting plates (2), characterized in that: The top outer surface of the threaded mounting plate (2) is rotatably connected to a support shaft (3), the top outer surface of the support shaft (3) is fixedly connected to an L-shaped fixing plate (10), the outer surface of the support shaft (3) is fixedly fitted with a limiting plate (4), the outer surface of the limiting plate (4) has two symmetrically arranged limiting holes (5), the top outer surface of the threaded mounting plate (2) is fixedly connected to a vertical plate (6), the outer surface of the vertical plate (6) is movably inserted with a movable rod (7), the outer surface of the movable rod (7) is fixedly connected to a connecting plate, the side of the connecting plate facing the limiting plate (4) is fixedly connected to a positioning rod (8), the positioning rod (8) is movably inserted into the limiting hole (5), the connecting plate and the vertical plate (6) are fixedly connected with a spring (9), the spring (9) is fitted on the outer surface of the movable rod (7).

2. The medical needle tube rigidity and toughness testing instrument according to claim 1, characterized in that: An electric push rod (17) is installed on the front outer surface of the tester (1), and a columnar push rod (18) is fixedly installed at the output end of the electric push rod (17).

3. The medical needle tube rigidity and toughness testing instrument according to claim 2, characterized in that: The front top outer surface of the tester (1) is fixedly connected to an adjustment platform (16). The top outer surface of the adjustment platform (16) is fixedly connected to two support blocks. A positive and negative screw rod (14) is rotatably connected between the two support blocks. The outer surfaces of the two threaded mounting plates (2) are threaded onto the outer surfaces of the positive and negative screw rod (14). A knob (15) is fixedly connected to the outer surface of the positive and negative screw rod (14).

4. The medical needle tube rigidity and toughness testing instrument according to claim 1, characterized in that: The top outer surface of the L-shaped fixing plate (10) is provided with a groove (13) for accommodating the placement of medical needle tubes.

5. The medical needle tube rigidity and toughness testing instrument according to claim 1, characterized in that: The top outer surface of the L-shaped fixing plate (10) is provided with a T-shaped fixing block (11). The vertical section of the T-shaped fixing block (11) cooperates with the groove (13) to fix the medical needle tube. The outer surface of the T-shaped fixing block (11) is threaded with an adjusting bolt (12). The top outer surface of the L-shaped fixing plate (10) has two screw holes. The other end of the adjusting bolt (12) is connected to the internal thread of the screw hole.

6. The medical needle tube rigidity and toughness testing instrument according to claim 2, characterized in that: The bottom of the columnar push rod (18) is conical, and the outer surface of the columnar push rod (18) is provided with a through hole (19) to accommodate the passage of a medical needle.

7. The medical needle tube rigidity and toughness testing instrument according to claim 3, characterized in that: Two slide rods are fixedly connected between the two support blocks, and the two threaded mounting plates (2) are movably sleeved on the outside of the two slide rods.

8. A medical needle tube rigidity and toughness testing instrument according to claim 3, characterized in that: The front outer surface of the adjustment platform (16) is provided with scale lines, and the cone shape of the columnar push rod (18) corresponds to the 0 scale.

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