A blood sampling plunger pull force testing device

Abstract

The utility model discloses a kind of blood sampling plug pull-out force test apparatus, belong to medical instrument detection technical field, solve the problem of lacking blood sampling plug pull-out force test in prior art relies on manual operation. The apparatus includes equipment ontology, and the fixture for clamping carrier tube is fixed on equipment ontology, and blood sampling plug is inserted on the upper end of carrier tube;Vertical adjusting mechanism is further provided on the equipment ontology, and its movable end is connected with moving seat, and force sensor is installed on moving seat, and force sensor is connected with mounting seat, and puncture needle is mounted on mounting seat. By vertical adjusting mechanism drive puncture needle inserts or pulls out blood sampling plug, simultaneously by force sensor real-time acquisition force data, and transmit to controller and carry out analysis processing. The utility model realizes the automation, precision of blood sampling plug pull-out force, with structure reasonable, easy operation, measurement repeatability is high, safe and reliable and the like advantages, suitable for quality control and performance evaluation of medical sampling assembly.

Description

Technical Field

[0001] This utility model relates to the field of pull-out tester technology, and in particular to a blood collection plug pull-out force tester. Background Technology

[0002] In the field of medical testing and blood collection equipment, blood collection plugs (usually made of rubber) are widely used in the sealing structure of containers such as test tubes and blood collection tubes. Their main function is to achieve an airtight seal of the container while allowing the puncture needle to collect blood or extract samples without opening the cap. In practical use, blood collection plugs need to possess good elasticity, sealing properties, and pull-out resistance. Especially in automated sampling equipment, higher requirements are placed on the pull-out force of the blood collection plug (i.e., the maximum resistance encountered when the puncture needle is inserted and then withdrawn).

[0003] To ensure the safety and reliability of blood collection plugs in clinical applications, their physical properties must be rigorously tested, with pull-out force testing being a key indicator. Insufficient pull-out force may lead to poor sealing, sample leakage, or contamination, while excessive pull-out force may cause problems with needle insertion. Currently, pull-out force testing of blood collection plugs is mostly conducted using general-purpose universal testing machines or simple manual devices. However, these methods have several drawbacks: Poor compatibility with general equipment: Although traditional universal testing machines have high-precision force measurement capabilities, they lack dedicated fixtures and positioning structures, making it difficult to accurately simulate real puncture conditions and unable to fix the assembly state of the bearing tube and blood collection plug, resulting in large deviations in test results.

[0004] Inconvenient to operate and inefficient: Manual testing devices rely on manual force application, resulting in uneven force distribution, inability to guarantee uniform loading, poor data repeatability, and inability to record force curves in real time, making it difficult to meet standardized testing requirements.

[0005] Furthermore, due to the diverse mating methods between the blood collection plug and the carrier tube (such as insertion and compression), different specifications of blood collection components require different clamping and puncture strategies. Existing testing equipment generally lacks flexibility and adjustability, making it difficult to adapt to compatibility testing of various product models. In addition, since the pull-out force test currently uses matching blood collection tubes, which are used in large quantities and are made of polyethylene, there is a probability that the blood collection tube wall will rupture during the test.

[0006] In summary, there is currently a lack of a dedicated testing instrument for detecting the pull-out force of blood collection plugs that can ensure testing accuracy while achieving automated control, safe operation, and compatibility with multiple specifications. Utility Model Content

[0007] To address the shortcomings in the aforementioned background technology, this utility model proposes a blood collection plug pull-out force testing device, which solves the problem of existing technologies lacking blood collection plug pull-out force testing and relying on manual operation.

[0008] The technical solution of this utility model is implemented as follows: A blood collection plug pull-out force testing device includes a device body, a clamp fixedly provided on the device body, the clamp being used to hold a support tube, the upper end of the support tube being used to support the blood collection plug; the device body is provided with a vertical adjustment mechanism, the movable end of the vertical adjustment mechanism is provided with a movable seat, the movable seat is provided with a force sensor, the force sensor is connected to a mounting base, a puncture needle is installed on the mounting base, and the force sensor is used to connect with a controller to realize real-time acquisition and transmission of force data during the test.

[0009] Preferably, the vertical adjustment mechanism includes a column vertically fixed on the equipment body, a movable seat slidably mounted on the column, a lead screw vertically rotatable on the equipment body, and the lead screw cooperating with a lead screw nut fixedly mounted on the movable seat; a drive unit for driving the lead screw to rotate is fixedly mounted on the equipment body.

[0010] Preferably, the clamp is a three-jaw caliper, capable of self-centering and clamping bearing tubes of different diameters to ensure the stability and non-deviation of the sample during testing. The drive unit is a servo motor, which can precisely control the lifting speed of the moving seat to ensure uniform and stable puncture process. The device body includes a base, on which a C-shaped housing is provided. The vertical adjustment mechanism is located inside the C-shaped housing, and the moving seat extends out from the opening of the C-shaped housing.

[0011] Preferably, the top of the C-shaped shell is provided with a top cover, and telescopic folding nets are provided between the movable seat and the top cover, and between the movable seat and the base. The telescopic folding nets are located at the opening of the C-shaped shell and serve to prevent dust and protect the person.

[0012] Preferably, the blood collection plug is a rubber plug, and the blood collection plug is inserted into the support tube. The support tube is a metal tube. The mounting base is an elastic clamp. The puncture needle includes a female end, which is connected to the elastic clamp, and a needle tip is fixedly mounted at the axis of the female end.

[0013] The beneficial effects of this utility model are: By setting clamps on the device body to fix the carrier tube, and combining the vertical adjustment mechanism to drive the moving seat to raise and lower the puncture needle, and with the force sensor to detect the force during the puncture and pull-out process in real time, the automatic and accurate testing of the blood collection plug pull-out force is realized. This structure avoids the error caused by manual operation, improves the repeatability of the test and the reliability of the data, and at the same time, the overall layout is compact, the operation is safe, and it is easy to achieve standardized testing. Attached Figure Description

[0014] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the external three-dimensional structure of the present invention; Figure 2 This is a schematic diagram showing the state of the hidden telescopic folding net of this utility model; Figure 3 This is a schematic diagram of the internal structure of the C-shaped shell of this utility model; Figure 4 This is a schematic cross-sectional view of the connection structure between the blood collection plug and the support tube of this utility model; In the diagram: 1—Equipment body, 11—Base, 12—C-shaped shell, 13—Top cover, 2—Clamp, 3—Bearing tube, 4—Blood collection plug, 5—Vertical adjustment mechanism, 51—Column, 52—Screw, 53—Drive unit, 6—Moving seat, 7—Force sensor, 8—Mounting seat, 9—Punch needle, 91—Female end, 92—Needle, 14—Telescopic folding net. Detailed Implementation

[0016] 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.

[0017] like Figure 1 , 2 As shown in Embodiment 1, a blood collection plug pull-out force testing device includes a device body 1. A clamp 2 is fixedly mounted on the device body 1. The clamp 2 is used to hold a support tube 3. The upper end of the support tube 3 is used to support the blood collection plug 4. By setting the clamp, the support tube can be clamped. A vertical adjustment mechanism 5 is provided on the device body 1. A movable seat 6 is provided at the movable end of the vertical adjustment mechanism 5. A force sensor 7 is provided on the movable seat 6. The force sensor can be a conventional sensor such as an FS09 type force sensor. The force sensor 7 is connected to a mounting base 8. A puncture needle 9 is mounted on the mounting base 8. The mounting base can fix the puncture needle. The force sensor 7 is used to connect to a controller to collect the force data applied during the test in real time.

[0018] In this embodiment, the controller can be a conventional single-chip microcomputer, PLC controller or microcomputer. The controller is electrically connected to the force sensor to realize signal transmission. At the same time, the controller is connected to the vertical adjustment mechanism, so as to adjust the position of the mounting base by controlling the vertical adjustment mechanism, thereby completing the process of the puncture needle moving closer or further away from the blood collection plug, and finally completing the needle puncture and pull-out experiment.

[0019] Example 2: A blood collection plug pull-out force testing device, based on Example 1, such as... Figure 3 As shown, the vertical adjustment mechanism 5 includes a column 51 vertically fixed on the device body 1, a movable seat 6 slidably mounted on the column 51, and a lead screw 52 vertically rotatably mounted on the device body 1. The lead screw 52 cooperates with a lead screw nut fixedly mounted on the movable seat 6. A drive unit 53 for driving the lead screw 52 to rotate is fixedly mounted on the device body 1. The drive unit 53 provides power. In this embodiment, the drive unit 53 is a servo motor. The controller controls the forward and reverse rotation of the servo motor to achieve precise lifting and lowering movement of the movable seat 6 on the column 51, ensuring uniform and controllable speed during the piercing and pulling processes.

[0020] In addition, in this embodiment, the clamp 2 is a three-jaw caliper. The bottom of the three-jaw caliper is bolted to the equipment body and is used to clamp the bearing tube 3 to keep it vertical and accurately position it. The three-jaw caliper is a conventional universal pipe clamp, which is convenient to clamp and install. There is no need to change the clamp for different specifications of blood collection tubes, which improves versatility and applicability and reduces equipment costs.

[0021] Example 3: A blood collection plug pull-out force testing device, based on Example 2, the device body 1 includes a base 11, a C-shaped housing 12 is provided on the base 11, a vertical adjustment mechanism 5 is provided inside the C-shaped housing 12, and a movable seat 6 protrudes from the opening of the C-shaped housing 12. The C-shaped housing 12 provides protection for the internal vertical moving mechanism.

[0022] In addition, a top cover 13 is provided on the top of the C-shaped housing 12. Telescopic folding nets 14 are provided between the movable seat 6 and the top cover 13, and between the movable seat 6 and the base 11. The telescopic folding nets 14 are located at the opening of the C-shaped housing 12. In this embodiment, the telescopic folding nets 14 are made of conventional elastic materials such as rubber, and have a continuous W-shaped structure. The telescopic folding nets 14 can expand or fold as the movable seat 6 moves up and down, effectively sealing the moving parts inside the C-shaped housing 12, preventing accidental contact by operators, improving equipment safety, and also isolating dust.

[0023] Example 4: A blood collection plug pull-out force testing device, based on Example 3, such as... Figure 4As shown, the blood collection plug 4 is a rubber plug, and it is inserted into the support tube 3. As an optional solution, the support tube 3 can be a blood collection tube directly used for testing. In this embodiment, the support tube 3 is a metal tube, which simulates actual working conditions, can be reused multiple times, is not easily damaged during testing, and is convenient for clamping.

[0024] In addition, in this embodiment, the mounting base 8 adopts a conventional elastic clamp, and the puncture needle 9 includes a female end 91, which is connected to the elastic clamp. A needle tip 92 is fixedly provided at the axis of the female end 91. After the female end 91 is inserted into the elastic clamp, it is firmly fixed by it, ensuring that the force transmission path is stable and reliable. The elastic clamp can clamp or release the puncture needle 9, which is convenient for changing the needle type according to different testing requirements.

[0025] As a further optional implementation, a pair of limit switches are provided on the upper and lower sides of the inner wall of the C-shaped housing. The limit switches are connected to the controller and are used to cooperate with the upper and lower ends of the movable seat to limit the vertical movement range of the movable seat.

[0026] During operation, the support tube 3 is placed in a three-jaw caliper and clamped. The blood collection plug 4 is inserted into the upper end of the support tube 3 via a plug-in method. The controller is activated, and the controller controls the servo motor 53 to drive the lead screw 52 to rotate, which in turn moves the moving seat 6 downward, allowing the puncture needle 9 to gradually insert into the blood collection plug 4 until it is completely penetrated. Then, it moves upward in the reverse direction, and the maximum pull-out force value fed back by the force sensor 7 during the process of the puncture needle 9 being pulled out of the blood collection plug is recorded and transmitted to the controller for storage and analysis.

[0027] The blood collection plug pull-out force testing device provided in this embodiment realizes the automated and standardized testing of blood collection plug puncture resistance and pull-out force. It has the advantages of simple operation, high measurement accuracy, good repeatability, and strong safety protection. It is suitable for medical institutions, quality inspection departments, and medical device manufacturers to control the quality and evaluate the performance of blood collection tube components.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A blood collection plug pull-out force testing device, characterized in that: The device includes a main body (1), on which a clamp (2) is fixedly mounted. The clamp (2) is used to hold a support tube (3), and the upper end of the support tube (3) is used to support a blood collection plug (4). The main body (1) is provided with a vertical adjustment mechanism (5), and the movable end of the vertical adjustment mechanism (5) is provided with a moving seat (6). The moving seat (6) is provided with a force sensor (7), which is connected to a mounting base (8). A puncture needle (9) is mounted on the mounting base (8), and the force sensor (7) is used to connect to a controller.

2. The blood collection plug pull-out force testing apparatus according to claim 1, characterized in that: The vertical adjustment mechanism (5) includes a column (51) vertically fixed on the equipment body (1), a movable seat (6) slidably mounted on the column (51), a lead screw (52) vertically rotatably mounted on the equipment body (1), and the lead screw (52) cooperating with the lead screw nut fixedly mounted on the movable seat (6); a drive unit (53) for driving the lead screw (52) to rotate is fixedly mounted on the equipment body (1).

3. The blood collection plug pull-out force testing apparatus according to claim 2, characterized in that: The clamp (2) is a three-jaw caliper.

4. The blood collection plug pull-out force testing apparatus according to claim 3, characterized in that: The drive unit (53) is a servo motor.

5. The blood collection plug pull-out force testing apparatus according to any one of claims 1 to 4, characterized in that: The device body (1) includes a base (11), a C-shaped housing (12) is provided on the base (11), a vertical adjustment mechanism (5) is provided inside the C-shaped housing (12), and a movable seat (6) extends out from the opening of the C-shaped housing (12).

6. The blood collection plug pull-out force testing apparatus according to claim 5, characterized in that: The top of the C-shaped housing (12) is provided with a top cover (13). Telescopic folding nets (14) are provided between the movable seat (6) and the top cover (13) and between the movable seat (6) and the base (11). The telescopic folding nets (14) are located at the opening of the C-shaped housing (12).

7. The blood collection plug pull-out force testing apparatus according to claim 6, characterized in that: The blood collection plug (4) is a rubber plug, and the blood collection plug (4) is inserted into the support tube (3).

8. The blood collection plug pull-out force testing apparatus according to claim 7, characterized in that: The bearing pipe (3) is a metal pipe.

9. The blood collection plug pull-out force testing apparatus according to claim 8, characterized in that: The mounting base (8) is an elastic clamp.

10. The blood collection plug pull-out force testing apparatus according to claim 9, characterized in that: The puncture needle (9) includes a female end (91), which is connected to an elastic clamp, and a needle tip (92) is fixedly disposed at the axis of the female end (91).

Images