Negative pressure puncture needle

Abstract

The utility model discloses a negative pressure puncture needle which comprises a needle tube and a piston rod arranged in the needle tube, a needle head seat is arranged at the end of the needle tube, a needle sleeve is fixed on the needle head seat, a needle core is fixed on the piston rod, the needle core is movably arranged in the needle sleeve along with the piston rod, a protruding step is arranged in the middle of the piston rod, and a spring is sleeved on the piston rod. One end of the spring is fixed to the surface of the step, the other end of the spring is fixed to the end, close to the needle base, of the piston rod, and an excitation mechanism used for triggering elasticity of the spring is arranged between the needle tube and the piston rod in a matched mode. The negative pressure aspirator can quickly and efficiently complete the negative pressure aspiration process, is simple and convenient to operate, and is suitable for various clinical puncture operations.

Description

Technical Field

[0001] The utility model belongs to the technical field of biopsy, and in particular relates to a negative pressure puncture needle. Background Art

[0002] In the field of medical devices, negative pressure puncture needles are widely used in various clinical operations, especially in the collection of tissue samples and the aspiration of body fluids. Traditional negative pressure puncture needles are usually composed of a needle tube, a piston rod, a needle seat, etc., and negative pressure is generated by manually pushing and pulling the piston rod. However, this type of structure has certain defects. For example, during manual operation, the operator needs to exert a large force to push or pull the piston rod, which can easily lead to inconvenience in operation, especially when performing long-term punctures or collecting a large number of tissue samples, the workload of medical staff will increase significantly. In addition, due to its simple structure, traditional negative pressure puncture needles are prone to insufficient negative pressure due to improper operation during the puncture process, which in turn leads to sample collection failure or insufficient sample volume, affecting subsequent diagnosis or treatment.

[0003] To improve the efficiency of negative pressure puncture needles and reduce the burden on medical personnel, a variety of puncture needles with automatic negative pressure activation have emerged in recent years. These needles utilize a built-in spring and activation mechanism to automatically release spring energy upon reaching a predetermined position, generating a stable negative pressure for rapid and efficient sample collection. However, existing automatic activation negative pressure puncture needles are complex in structure, resulting in high manufacturing costs, and their negative pressure activation mechanisms are prone to malfunction, compromising their effectiveness.

[0004] In addition, during operation, traditional negative pressure puncture needles often face the problem of liquid or tissue samples remaining in the needle tube, especially when collecting large amounts of body fluids or tissues, which is difficult to clean and can easily cause cross infection. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a negative pressure puncture needle, which can quickly and efficiently complete the negative pressure suction process, is easy to operate, and is suitable for various clinical puncture operations.

[0006] The technical solutions provided by this utility model are as follows:

[0007] A negative pressure puncture needle comprises a needle tube, a piston rod disposed in the needle tube, a needle seat at the end of the needle tube, a needle sleeve fixed on the needle seat, a needle core fixed on the piston rod, and the needle core is arranged in the needle sleeve following the movement of the piston rod;

[0008] A protruding step is provided in the middle of the piston rod, and a spring is sleeved on the piston rod. One end of the spring is fixed to the surface of the step, and the other end of the spring is fixed to the end of the piston rod close to the needle seat.

[0009] A trigger mechanism for triggering spring elasticity is arranged between the needle tube and the piston rod.

[0010] In some embodiments, the trigger mechanism comprises a trigger button and a limiting block arranged on the needle tube, and an elastic member arranged on the piston rod, the elastic member being provided with a protrusion, the protrusion protruding from the surface of the needle tube and being engaged with the limiting block to store the energy of the spring, the trigger button being located on the side of the protrusion away from the piston rod, and the spring energy being triggered by pressing the trigger button to separate the protrusion from the limiting block.

[0011] In some embodiments, the side of the needle tube close to the needle seat has a smaller diameter than the other side, the trigger button is fixed on the side of the needle tube close to the needle seat, and the limiting block is fixed on the other side, and a through slot is formed below the limiting block for the elastic member to pass through.

[0012] In some embodiments, the end of the piston rod away from the needle seat is provided with a pressing head.

[0013] In some embodiments, the side of the piston rod close to the pressing head is provided with a connector, a needle core passes through the piston rod and is connected with the connector, and a through slot is formed on the needle core along the axial direction.

[0014] In some embodiments, the cross section of the through slot is V-shaped.

[0015] In some embodiments, the pressing head is inserted on the piston rod, and the insertion of the pressing head is matched with the connector.

[0016] In some embodiments, a plurality of arc-shaped grooves are formed on the surface of the needle tube, and a plurality of guide columns matched with the arc-shaped grooves are arranged on the piston rod.

[0017] In summary, the beneficial effects of the utility model are as follows:

[0018] (1) The negative pressure puncture needle has a simple structure, the spring and the trigger mechanism are arranged, the negative pressure can be automatically triggered in operation, and the operation difficulty of the medical staff in manually pulling the piston rod is reduced. The disengagement of the protrusion from the limiting block is controlled through the trigger button, the energy of the spring can be accurately released, the negative pressure can be quickly and stably generated, and the efficiency of operation and the success rate of puncture are improved.

[0019] (2) The V-shaped through slot on the needle core and the design of the connector can effectively extract and discharge the excess cells and tissue fluid generated in the puncture process, so as to avoid the waste and residue of the tissue cells. This design greatly improves the cleanliness and efficiency of sampling, and is especially suitable for multiple sample collection or long-time puncture operation, and effectively reduces the risk of cross infection. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the needle tube structure of the utility model;

[0023] Figure 4 This is a schematic diagram of the piston rod structure of the utility model;

[0024] Figure 5 for Figure 1 Enlarged view of point A in the middle;

[0025] Figure 6 This is a cross-sectional view of the needle core of the utility model.

[0026] The reference numerals are as follows:

[0027] 1. Needle tube; 2. Piston rod; 3. Needle seat; 4. Needle sleeve; 5. Needle core; 6. Step; 7. Spring; 9. Press head; 10. Connector; 11. Through slot; 12. Arc slot; 13. Guide post;

[0028] 81. Excitation button; 82. Limit block; 83. Elastic member; 84. Protrusion. DETAILED DESCRIPTION

[0029] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0030] Example 1

[0031] like Figures 1-4 As shown, this embodiment provides a negative pressure puncture needle, which primarily comprises a needle tube 1, a piston rod 2, a needle holder 3, a needle guard 4, a needle core 5, a spring 7, and an activation mechanism. The needle holder 3 is fixed to the smaller diameter end of the needle tube 1, on which the needle guard 4 is mounted. The needle core 5 is fixed to the front end of the piston rod 2 and engages with the needle guard 4. The needle core 5 slides within the needle guard 4 along with the piston rod 2, thereby controlling the generation and release of negative pressure during the puncture process.

[0032] A raised step 6 is located in the middle of the piston rod 2, securing one end of a spring 7. The other end of the spring 7 is fixed to the end of the piston rod 2 near the needle holder 3. The presence of step 6 effectively limits the movement of the spring, ensuring its stability during aspiration. An activation mechanism is located between the needle tube 1 and the piston rod 2 to trigger the spring 7's elasticity, ensuring stability and ease of use during puncture needle operation.

[0033] In order to ensure the smooth movement of the piston rod 2 during the suction process, the needle tube 1 surface is also provided with several arc-shaped grooves 12, and the piston rod 2 is provided with guide posts 13 matched with the arc-shaped grooves 12. The cooperation of the guide posts 13 and the arc-shaped grooves 12 further ensures the stability of the piston rod 2 during operation, avoiding the phenomenon of jamming or deviation during operation.

[0034] Embodiment 2

[0035] This embodiment is formed on the basis of embodiment 1, and the stability and efficiency of the negative pressure puncture needle are improved by further limiting the specific structure of the trigger mechanism, specifically:

[0036] The trigger mechanism includes a trigger button 81, a limiting block 82 and an elastic member 83, the elastic member 83 is provided with a protruding block 84 which protrudes from the surface of the needle tube 1 and is clamped with the limiting block 82. This design is mainly used to store the energy of the spring 7 before puncture operation, to ensure the stability and efficiency of the negative pressure puncture needle.

[0037] The side of the needle tube 1 close to the needle head base 3 has a smaller diameter than the other side, the trigger button 81 is installed on the side of the needle tube 1 close to the needle head base 3, and the limiting block 82 is fixed on the end of the needle tube 1 with larger diameter. A through groove is formed below the limiting block 82, and the elastic member 83 passes through the needle tube 1 through the through groove. After pressing the trigger button 81, the protruding block 84 will be separated from the limiting block 82, releasing the energy of the elastic member 83, and releasing the stored energy of the spring 7, pushing the piston rod 2 to move quickly, thereby generating negative pressure suction.

[0038] Embodiment 3

[0039] This embodiment is formed on the basis of embodiment 1 or embodiment 2, and the efficiency of sampling is ensured by setting the joint 10 and the through groove 11, specifically:

[0040] In this embodiment, the rear end of the piston rod 2 is provided with a pressing head 9, which is convenient for the operator to push or pull the piston rod 2 after puncture. The pressing head 9 is fixed on the rear end of the piston rod 2 by insertion, and is connected with the needle core 5 through the joint 10. The needle core 5 passes through the middle part of the piston rod 2 and is connected with the joint 10, ensuring the stability of the needle core 5.

[0041] Further, the needle core 5 is provided with a V-shaped through groove 11 along its axial direction. The through groove 11 can extract excess cells and tissue fluid from the side of the pressing head 9 through the joint 10. This design can effectively prevent liquid from remaining in the needle cover 4, prevent waste of tissue cells, ensure the cleanliness and accuracy of the puncture operation, especially when multiple collections or cleaning of the puncture site are required, providing a more efficient solution.

[0042] The working principle of the technical solution is:

[0043] The negative pressure puncture needle of the utility model realizes the negative pressure suction function through the interaction of the trigger mechanism, spring 7, piston rod 2 and needle core 5. In the operation process, the user first punctures one end of the needle sleeve 4 into the target tissue, and pushes the needle core 5 to puncture through the piston rod 2. When reaching the predetermined position, press the trigger button 81, so that the protrusion 84 on the elastic piece 83 is separated from the limiting block 82, and the energy of the spring 7 is released. The energy of the spring 7 pushes the piston rod 2 to move back quickly, forming negative pressure, so that the tissue or body fluid is sucked into the needle sleeve 4. Because the surface arc-shaped groove 12 of the needle tube 1 cooperates with the guide column 13 on the piston rod 2, the movement of the piston rod 2 is more stable, avoiding the suction failure caused by the deviation of the piston rod in the operation. Meanwhile, other suction devices can also be connected with the connector 10, and the excess cells and tissue fluid can be extracted through the connector 10. This design can effectively prevent the liquid from remaining in the needle sleeve 4, prevent the waste of tissue cells, and ensure the cleanliness and accuracy of the puncture operation.

[0044] Through the structural design, the negative pressure puncture needle of the utility model can quickly and efficiently complete the negative pressure suction process, and the operation is simple, which is suitable for various clinical puncture operations.

[0045] It should be noted that the implementation modes not shown or described in the drawings or the specification are the forms known by those skilled in the art, and are not described in detail. In addition, the definitions of the elements and methods described above are not limited to the various specific structures, shapes or manners mentioned in the embodiments.

[0046] It should also be noted that this paper can provide examples of parameters containing specific values, but these parameters do not need to be exactly equal to the corresponding values, but can be approximately equal to the corresponding values within the acceptable error tolerance or design constraints. The direction mentioned in the embodiments, such as "up", "down", "front", "back", "left", "right", "inside", "outside" and the like, is only the direction of the drawings, and is not used to limit the protection scope of the application.

[0047] The above description shows and describes the preferred embodiments of the utility model, as mentioned before, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein by the above teaching or related technology or knowledge. The modification and change made by the person skilled in the art without departing from the spirit and scope of the utility model should be within the protection scope of the claims attached to the utility model.

Claims

1. A negative pressure puncture needle, characterized in that: The invention comprises a needle tube (1), a piston rod (2) arranged in the needle tube (1), a needle seat (3) at the end of the needle tube (1), a needle sleeve (4) fixed on the needle seat (3), a needle core (5) fixed on the piston rod (2), and the needle core (5) is arranged in the needle sleeve (4) so ​​as to move along with the piston rod (2); A protruding step (6) is provided in the middle of the piston rod (2), and a spring (7) is sleeved on the piston rod (2), one end of the spring (7) is fixed to the surface of the step (6), and the other end of the spring (7) is fixed to the end of the piston rod (2) close to the needle seat (3); An excitation mechanism for triggering the elasticity of the spring (7) is provided between the needle tube (1) and the piston rod (2).

2. The negative pressure puncture needle according to claim 1, characterized in that: The excitation mechanism comprises an excitation button (81) and a limit block (82) arranged on the needle tube (1), and an elastic member (83) arranged on the piston rod (2); the elastic member (83) is provided with a protrusion (84); the protrusion (84) protrudes from the surface of the needle tube (1) and engages with the limit block (82) for storing the energy of the spring (7); the excitation button (81) is located on a side of the protrusion (84) away from the piston rod (2); the protrusion (84) is separated from the limit block (82) by pressing, thereby exciting the energy of the spring (7).

3. The negative pressure puncture needle according to claim 2, characterized in that: The diameter of one side of the needle tube (1) close to the needle seat (3) is smaller than the diameter of the other side; the excitation button (81) is fixed to the side of the needle tube (1) close to the needle seat (3); the limit block (82) is fixed to the other side; and a through groove for the elastic member (83) to pass through is provided below the limit block (82).

4. The negative pressure puncture needle according to claim 1, characterized in that: A pressing head (9) is provided at one end of the piston rod (2) away from the needle seat (3).

5. The negative pressure puncture needle according to claim 4, characterized in that: A joint (10) is provided on the side of the piston rod (2) close to the pressing head (9), and the needle core (5) passes through the piston rod (2) and is connected to the joint (10). A through groove (11) is formed on the needle core (5) along its axial direction.

6. The negative pressure puncture needle according to claim 5, characterized in that: The cross section of the through groove (11) is V-shaped.

7. The negative pressure puncture needle according to claim 5, characterized in that: The pressing head (9) is plugged into the piston rod (2), and the plugging of the pressing head (9) is in cooperation with the joint (10).

8. The negative pressure puncture needle according to claim 3, characterized in that: The needle tube (1) has a plurality of arc-shaped grooves (12) on its surface, and the piston rod (2) has a plurality of guide posts (13) matched with the arc-shaped grooves (12).

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