A needle tip penetration force tester

Abstract

This utility model discloses a needle tip puncture force tester, including a puncture force tester body. A clamping seat is fixed to the end of the push rod used for driving in the puncture force tester body. A puncture needle is sleeved on the lower end of the clamping seat. A lifting and pressing mechanism is provided on the outside of the puncture needle. The lifting and pressing mechanism includes a pressing frame, one end of which is slidably connected to the clamping seat. This utility model pre-clamps the puncture needle through the pressing frame in the lifting and pressing mechanism. The pre-clamping operation is simple and does not rely on the operator's professional skills or precise control ability. Even non-professionals can complete the pre-clamping by directional sliding and squeezing positioning. The method of pre-clamping and then resetting the pressing frame effectively solves the problems of "obstructed vision, inconvenient operation, and difficult positioning" caused by the clamping seat being blocked by the protective shell in the traditional direct clamping, and significantly improves the ease of use of installation and operation.

Description

Technical Field

[0001] This utility model relates to the field of puncture force testing technology, specifically a needle tip puncture force tester. Background Technology

[0002] In fields such as medicine and bioengineering, the puncture force of a puncture needle is a key indicator of its performance, directly affecting the safety and effectiveness of clinical use. For example, excessive puncture force in medical devices such as infusion needles and suture needles may lead to increased tissue damage in patients, while insufficient force may result in difficult punctures and reduced operational efficiency. Therefore, it is necessary to accurately test the puncture force of puncture needles using specialized equipment. Existing needle tip puncture force testers generally consist of a drive body (including a push rod mechanism), a clamping component, a testing platform, and a control system. The clamping component, which secures the puncture needle to the push rod output end, is the core structure ensuring stable puncture posture.

[0003] In existing testing instruments, the clamping base is usually fixed to the lower end of the push rod. To ensure equipment safety, a protective shell or shielding structure is often installed around the clamping base. This results in the clamping part of the clamping base (facing downwards) being in an environment with obstructed vision and narrow operating space. When manually installing the puncture needle, it is difficult to visually observe the alignment, which easily leads to "blind installation," increasing the difficulty and time consumption of installation. Furthermore, direct manual installation has the drawback of not being convenient for accurate guidance and positioning assistance. Non-professionals or inexperienced operators are prone to causing the puncture needle to tilt due to alignment deviation. In addition, since the fixation of the puncture needle and the clamping base mostly relies on the mechanical engagement of the sleeve and the clamping base, after long-term use, the clamping base may have dimensional deviations due to wear, or the puncture needle sleeve may have slight manufacturing errors, which can easily cause gaps between the two, thus affecting the firmness of the equipment in clamping the puncture needle. Therefore, a needle tip puncture force tester is needed to solve the problems existing in the prior art. Utility Model Content

[0004] The purpose of this invention is to provide a needle tip puncture force 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 needle tip puncture force tester, comprising a puncture force tester body, wherein a clamping seat is fixed to the end of a push rod used for driving in the puncture force tester body, a puncture needle is sleeved on the lower end of the clamping seat, a lifting and pressing mechanism is provided on the outside of the puncture needle, the lifting and pressing mechanism includes a pressing frame, one end of the pressing frame is slidably connected to the clamping seat, a pressing spring is provided at the bottom of the end of the pressing frame that extends into the clamping seat, a positioning groove is provided on the lower surface of the pressing frame, and a positioning hole is provided at the end of the positioning groove on the lower surface of the pressing frame.

[0006] Preferably, a lifting groove is provided through the side surface of the clamping seat, and the upper end of the pressing frame is slidably connected in the lifting groove of the clamping seat.

[0007] Preferably, the upper surface of the pressing frame is provided with a lifting sliding hole, and a lifting guide column is fixed between the inner top wall and the inner bottom wall where the lifting sliding groove of the clamping seat is located.

[0008] Preferably, the lifting sliding hole is slidably adapted to the lifting guide column, one end of the compression spring is fixed on the inner bottom wall of the clamping seat, and the other end of the compression spring is fixed on the bottom of the upper section of the pressing frame.

[0009] Preferably, the lower side surface of the pressing frame is provided with a pick-and-place opening, which is connected to the positioning slide groove.

[0010] Preferably, extrusion blocks are fixed on the two side walls where the positioning groove of the pressing frame is located, and a shuttle opening is provided between the two extrusion blocks.

[0011] Preferably, the shuttle opening is connected to the positioning hole, and the diameter of the positioning hole is adapted to the size of the puncture needle socket.

[0012] Preferably, the puncture needle consists of a needle body and a sleeve for syringe mounting, the needle body being fixed to the lower end of the sleeve, and the sleeve in the puncture needle engaging with the lower end of the clamping seat.

[0013] This invention provides a needle tip puncture force tester, which has the following advantages compared with the prior art:

[0014] (1) By improving the pre-clamping design of the clamping frame for the puncture needle in the clamping mechanism, and the pre-clamping operation steps are simple, it does not rely on the professional proficiency or precise control ability of the operator. Even non-professionals can complete the pre-clamping by directional sliding and squeezing positioning. The method of pre-clamping and then resetting the clamping frame effectively solves the problems of "obstructed vision, inconvenient operation and difficult positioning" caused by the clamping seat being blocked by the protective shell in the traditional direct clamping, and significantly improves the ease of use of the installation operation.

[0015] (2) The compression spring provides continuous rebound force when the compression frame is reset, so that the puncture needle sleeve and the lower end of the clamping seat are tightly fitted, which can offset the dimensional deviation caused by the excessive size of the sleeve hole or the wear of the clamping seat, and avoid gaps or loosening between the two; the double fixing structure ensures that the puncture needle will not be displaced or fall off during the test (such as puncture action, equipment vibration), and ensures the reliability of clamping. Attached Figure Description

[0016] Figure 1 This is a perspective view of the overall structure of this utility model;

[0017] Figure 2 This is a three-dimensional view of the lifting and pressing mechanism of this utility model;

[0018] Figure 3 This is a perspective view of the pressing frame structure of this utility model;

[0019] Figure 4 For the present utility model Figure 3 Enlarged view of point A in the middle;

[0020] Figure 5 This is a perspective view of the pick-and-place port structure of this utility model;

[0021] Figure 6 This is a perspective view of the clamping base structure of this utility model;

[0022] Figure 7 This is a three-dimensional view of the puncture needle structure of this utility model.

[0023] In the diagram: 1. Puncture force tester body; 2. Clamping seat; 3. Puncture needle; 4. Lifting and pressing mechanism; 5. Pressing frame; 6. Positioning slide groove; 7. Pick-up and drop-off port; 8. Positioning hole; 9. Extrusion block; 10. Shuttle port; 11. Lifting slide hole; 12. Lifting slide groove; 13. Lifting guide column; 14. Compression spring. Detailed Implementation

[0024] 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.

[0025] Please see Figure 1-7 This utility model provides a needle tip puncture force tester, which consists of four parts: a puncture force tester body 1, a clamping base 2, a puncture needle 3, and a lifting and pressing mechanism 4. The clamping base 2 is fixed to the push rod output end of the tester body and is used to support the puncture needle 3. The lifting and pressing mechanism 4 (with a pressing frame 5 as its core) is sleeved on the outside of the puncture needle 3, enabling rapid positioning and reliable pre-clamping of the puncture needle. Through the cooperation of the positioning slide 6, the pick-and-place port 7, and the squeezing rubber block 9, the puncture needle 3 can be quickly pre-positioned. This eliminates the need for operator skill, allowing even non-professionals to easily complete the clamping. It avoids the problems of obstructed vision and operational obstacles caused by the clamping base 2 being located below the protective shell, reducing the difficulty of manual installation.

[0026] The clamping base 2 has a lifting groove 12 through which the upper end of the pressing frame 5 is slidably connected to the groove, so as to realize the up and down adjustment of the pressing frame.

[0027] The upper surface of the pressing frame 5 is provided with a lifting sliding hole 11, and a lifting guide column 13 is fixed in the lifting sliding groove 12 of the clamping seat 2. The lifting sliding hole 11 and the lifting guide column 13 are slidably matched to ensure the stability of the pressing frame during the lifting process.

[0028] Among them, a compression spring 14 is provided between the bottom of the upper section of the compression frame 5 and the inner bottom wall of the clamping seat 2. The spring force can keep the compression frame in the reset state when there is no external force, and provide continuous compression force for clamping the puncture needle. The continuous spring force of the compression spring 14 ensures that the puncture needle 3 sleeve and the clamping seat 2 fit tightly, effectively solving the loosening problem caused by the sleeve hole being too large or the clamping seat 2 being worn, and ensuring the stability of the testing process.

[0029] The lower section of the pressing frame 5 has a positioning groove 6, and the end of the groove has a positioning hole 8. The diameter of the positioning hole is adapted to the size of the sleeve of the puncture needle 3, and is used for the final positioning of the puncture needle 3.

[0030] The positioning slide 6 has a pick-and-place port 7 connected to one side, which facilitates the insertion of the puncture needle into the slide 6 from the side; the two side walls of the slide 6 are fixed with extrusion blocks 9, and a shuttle port 10 is formed between the two blocks. The shuttle port 10 is connected to the positioning hole 8. The extrusion action of the extrusion blocks 9 is used to achieve tight fixation of the puncture needle 3 seat.

[0031] The puncture needle 3 consists of a needle body and a sleeve (the needle body is fixed to the lower end of the sleeve). The sleeve is properly fitted to the lower end of the clamping seat 2, and can be fixed in the positioning hole 8 of the pressing frame by the pressure of the squeezing rubber block.

[0032] This solution has the following working process: Before testing the puncture needle 3, the puncture needle 3 is fixed to the lower end of the clamping seat 2 (the upper end of the clamping seat 2 is fixed to the output end of the push rod) through the sleeve at the upper end of the needle body. At this time, the puncture needle 3 is perpendicular to the aluminum foil mounted on the table. On the control panel of the puncture force tester body 1, the rising / falling speed of the puncture needle 3 can be set from the "push rod jog speed" item. After setting the required parameters, the puncture needle 3 descends with the push rod and applies a set force to the aluminum foil. When the needle punctures the aluminum foil, the force at this time is the puncture force, and the clamp returns to the origin with the push rod. Then, the position of the aluminum foil is moved so that the distance between each needle hole is more than 3 times the diameter of the suture needle. The puncture needle 3 is controlled to perform the puncture action again and the puncture force data is recorded. The test is repeated 3 times according to the steps, and the arithmetic mean is taken. This value is the puncture force of the suture needle.

[0033] When installing the puncture needle 3 onto the clamping seat 2, first pull down the pressing frame 5, causing the upper section of the pressing frame 5 to slide down along the lifting slide groove 12 of the clamping seat 2 and apply pressure to the clamping spring 14 to compress and deform it. This adjusts the height of the positioning hole 8 on the pressing frame 5, which is directly below the clamping seat 2. Then, insert the puncture needle 3 into the positioning slide groove 6 from the pick-up and drop-off port 7. The size of the sleeve in the puncture needle 3 is larger than the diameter of the positioning slide groove 6. Manually control the puncture needle 3 to slide directionally along the positioning slide groove 6, first breaking through the shuttle opening 10 between the two extrusion rubber blocks 9, and then sliding into the positioning hole 8 at the end of the positioning slide groove 6. Finally, the sleeve of the puncture needle 3 is clamped and positioned under the pressure of the extrusion rubber blocks 9. In the positioning hole 8 of the pressing frame 5; the pre-clamping and positioning of the puncture needle 3 by the pressing frame 5 does not depend on the operator's skill or precise control. Even non-professionals can complete the clamping by simply inserting and sliding, which improves the ease of operation. The pre-clamping method of the pressing frame 5 for the puncture needle 3 helps to reduce the difficulty of the final positioning and assembly of the puncture needle 3 and the clamping seat 2 located under the protective shell. The clamping seat 2 is located under the protective shell, and the clamping part of the clamping seat 2 faces downward. In this way, the clamping seat 2 and the puncture needle 3 are easily obstructed by the protective shell and the clamping action is hindered. Therefore, the manual installation of the clamping seat 2 and the puncture needle 3 has the problems of positioning difficulties and inconvenience of operation.

[0034] After the puncture needle 3 is pre-clamped onto the clamping frame 5, the pressure applied to the clamping frame 5 is slowly released. The clamping frame 5 returns to its original position under the rebound force of the clamping spring 14. At this time, the sleeve of the puncture needle 3 is fitted onto the lower end of the clamping seat 2 to complete the final clamping work. During this process, the rebound force of the clamping spring 14 continues to act on the clamping frame 5, so that the sleeve of the puncture needle 3 and the lower end of the clamping seat 2 fit tightly together, avoiding gaps or looseness between the two (the sleeve hole of the puncture needle 3 is too large or the clamping seat 2 is worn for a long time, resulting in slight dimensional deviations). This continuous clamping force can effectively prevent the puncture needle 3 from shifting or falling off due to vibration, external force or other factors during subsequent use (such as puncture operation, equipment operation), ensuring the reliability of clamping.

[0035] The working principle of a needle tip puncture force tester: As the core testing equipment, the needle tip puncture force tester typically works by using a drive mechanism to move a clamped and fixed puncture needle to puncture a test medium simulating human tissue (such as aluminum foil or simulated skin) at a set speed. The force changes during the puncture process are recorded in real time, and the force at the moment the puncture needle penetrates the medium is ultimately taken as the puncture force data. To ensure testing accuracy, industry standards usually require multiple repeated tests on the same puncture needle and the average value taken. This places strict requirements on the clamping stability and positioning accuracy of the puncture needle during the testing process.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Although embodiments of this utility model have been shown and described, this does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model. Regarding the embodiments of this utility model, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A needle tip puncture force tester, comprising a puncture force tester body (1), wherein a clamping seat (2) is fixed to the end of a push rod for driving in the puncture force tester body (1), and a puncture needle (3) is sleeved on the lower end of the clamping seat (2), characterized in that: The puncture needle (3) is provided with a lifting and pressing mechanism (4). The lifting and pressing mechanism (4) includes a pressing frame (5). One end of the pressing frame (5) is slidably connected to the clamping seat (2). A pressing spring (14) is provided at the bottom of the end of the pressing frame (5) that extends into the clamping seat (2). A positioning groove (6) is provided on the lower surface of the pressing frame (5). A positioning hole (8) is provided at the end of the positioning groove (6) on the lower surface of the pressing frame (5).

2. The needle tip puncture force tester according to claim 1, characterized in that: The side surface of the clamping seat (2) is provided with a lifting slide groove (12), and the upper end of the pressing frame (5) is slidably connected in the lifting slide groove (12) of the clamping seat (2).

3. A needle stick force test apparatus according to claim 2, wherein: The upper surface of the pressing frame (5) is provided with a lifting sliding hole (11), and a lifting guide column (13) is fixed between the inner top wall and the inner bottom wall where the lifting sliding groove (12) of the clamping seat (2) is located.

4. The needle stick force testing instrument of claim 3, wherein: The lifting slide hole (11) is slidably adapted to the lifting guide column (13), one end of the compression spring (14) is fixed on the inner bottom wall of the clamping seat (2), and the other end of the compression spring (14) is fixed on the bottom of the upper section of the pressing frame (5).

5. The needle stick force testing instrument of claim 1, wherein: The lower side surface of the pressing frame (5) is provided with a pick-up and put-out opening (7), which is connected to the positioning slide groove (6).

6. The needle tip puncture force tester according to claim 5, characterized in that: On the two side walls of the positioning groove (6) of the pressing frame (5), there are extrusion blocks (9), and a shuttle opening (10) is provided between the two extrusion blocks (9).

7. A needle tip puncture force tester according to claim 6, characterized in that: The shuttle port (10) is connected to the positioning hole (8), and the diameter of the positioning hole (8) is adapted to the size of the socket of the puncture needle (3).

8. The needle tip puncture force tester according to claim 1, characterized in that: The puncture needle (3) consists of a needle body and a sleeve for syringe mounting. The needle body is fixed to the lower end of the sleeve, and the sleeve in the puncture needle (3) is fitted with the lower end of the clamping seat (2).

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