One-piece biopsy needle

Abstract

The utility model discloses a one -gear integral biopsy needle, including device shell, the outer needle subassembly of being arranged in the inside of device shell, inner needle subassembly and force storage firing part, the utility model discloses the symmetrical structure design of symmetrical outer needle button and inner needle button, the clamping mechanism of combination card block and card slot, when pressing part fires, the card block of inner needle connecting piece is separated from the card slot by the clamping structure, and the spring release force and synchronous push inner needle connecting piece impact outer needle connecting piece, force the card block of outer needle subassembly and inner needle subassembly synchronous separation card slot, realize bidirectional symmetry firing, eliminate eccentric force in combination symmetry layout, ensure needle core linear motion along the axial, reduce the influence that lateral friction and torsion caused to needle smoothness, and the symmetrical distribution of movable slot and card slot makes spring energy even transmission, reduces the jamming of firing process, ensures needle head stab angle accurate stability, effectively solved the existing biopsy needle because of the jamming and unstable problem of asymmetric structure, significantly reduce clinical operation wind.

Description

Technical Field

[0001] This utility model relates to the field of medical device processing, specifically a single-piece integrated biopsy needle. Background Technology

[0002] Existing biopsy needles generally employ a spring-loaded mechanism for tissue sampling. The core principle is to store mechanical energy in a pre-compressed spring, releasing the force at the moment of triggering to drive the needle tip to rapidly penetrate the target tissue and complete the cutting and sampling. A typical design includes a needle tube, a spring built into the tube, a sliding needle core, and an external triggering mechanism (such as a button or lever).

[0003] During the procedure, the doctor presses the trigger mechanism, causing the spring to extend rapidly and push the needle core along the needle tube axis, thus unfolding the cutting edge at the tip of the needle and capturing the tissue sample. This type of structure is widely used for puncture biopsies in areas such as the liver, breast, and thyroid gland due to its ease of operation and high sampling efficiency.

[0004] Currently, some biopsy needles have spring-fired systems with asymmetrical structural designs. Asymmetrical force can lead to uneven release of spring energy, causing the needle insertion angle to deviate from the preset direction, resulting in a deviation in the needle core's trajectory and reducing sampling success rate. Furthermore, in some designs, the misalignment of the guide groove and spring fulcrum on one side causes the needle core to experience lateral torque during firing, exacerbating instability. These problems directly manifest in clinical practice as fluctuations in firing force, needle tremors, and poor handling feel, urgently requiring solutions through structural optimization. Utility Model Content

[0005] To solve the above problems, this utility model provides the following technical solution:

[0006] An integrated biopsy needle, characterized in that it comprises:

[0007] Device casing;

[0008] The external needle assembly includes a biopsy external needle disposed inside the device housing, an external needle connector connected to the biopsy external needle, and an external needle button connected to the external needle connector;

[0009] The inner needle assembly includes an inner biopsy needle disposed inside the outer biopsy needle, an inner needle connector connected to the inner biopsy needle, and an inner needle button connected to the inner needle connector.

[0010] A power-charging firing assembly includes a drive spring disposed inside a device housing and a firing part disposed on the surface of the device housing. The inner pin connector and the outer pin connector are both connected to the drive spring, and a snap-fit ​​structure is provided between the firing part and the inner pin connector.

[0011] The device housing has an internal groove for the movement of the outer needle connector and the inner needle connector, and a slot inside the device housing. The surface of the outer needle button has a locking block that matches the slot.

[0012] The outer and inner pin buttons together form a symmetrical structure with their vertical center line as the axis of symmetry.

[0013] When the outer needle connector and the inner needle connector are engaged in the slot by the locking block, the firing part can cause the locking block on the inner needle connector to disengage from the slot. At this time, the inner needle connector can strike the outer needle connector, causing the locking block on the outer needle connector to disengage from the slot.

[0014] Based on the above technical solution, the present invention can be further improved as follows.

[0015] Furthermore, the power-charging assembly includes a guide rod disposed inside the device housing, and the drive spring is located on the surface of the guide rod.

[0016] Furthermore, the guide rod surface is provided with a limiting member that divides the guide rod surface into two sections, and the inner needle connector and the outer needle connector are respectively connected to the two sections separated on the limiting member.

[0017] Furthermore, the firing mechanism includes a pressing plate disposed inside the device housing, and a control button disposed on the pressing plate.

[0018] Furthermore, the locking structure includes interlocking blocks disposed on the surfaces of the inner needle connector and the pressing plate. The control button can drive the pressing plate to move, causing the interlocking blocks on the pressing plate and the inner needle connector to disengage from each other.

[0019] Furthermore, the outer pin button surface has a guide slope and a locking protrusion on the surface of the linkage block, and the inner pin connector surface has an impact block that can contact the linkage block. The impact block surface has a release slope that matches the guide slope of the outer pin connector surface. When the impact block contacts the linkage block, the impact block can cause the linkage block to disengage from the slot through the release slope and the guide slope.

[0020] Furthermore, both the outer and inner pin buttons have a U-shaped structure when viewed from above.

[0021] Furthermore, the linkage block and the impact block are located at the ends of the outer needle button and the inner needle button, respectively.

[0022] Beneficial effects

[0023] Compared with existing technologies, this utility model adopts a symmetrical structure design of the outer needle button and the inner needle button, combined with the locking mechanism of the locking block and the locking slot. When the pressing part is fired, the locking structure causes the locking block of the inner needle connector to disengage from the locking slot, driving the spring to release the stored force and simultaneously push the inner needle connector to hit the outer needle connector. This forces the locking blocks of the outer needle assembly and the inner needle assembly to disengage from the locking slot simultaneously, achieving bidirectional symmetrical firing. The symmetrical layout eliminates eccentric force, ensuring that the needle core moves linearly along the axial direction and reducing the impact of lateral friction and torque on the smoothness of needle insertion. At the same time, the symmetrical distribution of the movable groove and the locking slot ensures that the spring energy is evenly distributed, reducing jamming during the firing process and ensuring that the needle insertion angle is accurate and stable. This effectively solves the jamming and instability problems caused by the asymmetrical structure of existing biopsy needles, and significantly reduces the clinical operation risk. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying 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.

[0025] Figure 1 This is a three-dimensional structural diagram of the utility model;

[0026] Figure 2 This is a schematic diagram of the exploded three-dimensional structure of the utility model;

[0027] Figure 3 This is a three-dimensional structural diagram of the outer needle connector, inner needle connector, and power-charging firing assembly of the utility model.

[0028] Figure 4 This is a front cross-sectional view of the outer needle connector, inner needle connector, and power-charging firing assembly of the utility model.

[0029] Figure 5 This is a schematic diagram of the top section structure of the utility model;

[0030] Figure 6 This is a top view schematic diagram of the outer and inner pin buttons of the utility model.

[0031] Figure 7 A three-dimensional structural diagram of the external pin button of the utility model;

[0032] Figure 8 A three-dimensional structural diagram of the inner pin button of the utility model;

[0033] The attached diagram lists the components represented by each number as follows:

[0034] 1. Device housing; 2. External needle assembly; 21. Biopsy external needle; 22. External needle connector; 23. External needle button; 24. Linkage block; 3. Internal needle assembly; 32. Biopsy internal needle; 33. Internal needle connector; 34. Internal needle button; 35. Impact block; 4. Power-charging firing assembly; 41. Drive spring; 42. Firing part; 421. Pressing plate; 422. Control button; 43. Guide rod; 44. Snap-fit ​​structure. Detailed Implementation

[0035] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the technical product is in use. They are only for the convenience of describing the technology and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the technology.

[0039] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] Please see Figure 1-8An integrated biopsy needle includes a device housing 1, an outer needle assembly 2, an inner needle assembly 3 and a power-charging firing unit 42 located inside the device housing 1. This integrated design simplifies the operation steps and improves structural stability by integrating the outer needle, inner needle and firing assembly, ensuring a smooth and reliable firing process.

[0041] The outer needle assembly 2 and the inner needle assembly 3 are common structures for biopsy needles in the prior art. The outer needle assembly 2 includes a biopsy outer needle 21 disposed inside the device housing 1, an outer needle connector 22 connected to the biopsy outer needle 21, and an outer needle button 23 connected to the outer needle connector 22. The inner needle assembly 3 includes a biopsy inner needle 32 disposed inside the biopsy outer needle 21, an inner needle connector 33 connected to the biopsy inner needle 32, and an inner needle button 34 connected to the inner needle connector 33. The symmetrical layout of the outer needle button 23 and the inner needle button 34 effectively eliminates the eccentric force caused by the asymmetrical structure, ensures balanced force during firing, and reduces the risk of needle core movement deviation.

[0042] The power-charging and firing assembly 4 includes a drive spring 41 located inside the housing 1 and a firing part 42 located on the surface of the housing 1. The inner pin connector 33 and the outer pin connector 22 are both connected to the drive spring 41. A locking structure 44 is provided between the firing part 42 and the inner pin connector 33. The synergistic effect of the drive spring 41 and the locking structure 44 can achieve precise power charging and instantaneous release, avoiding the jamming problem caused by spring misalignment or uneven energy transmission in traditional firing structures.

[0043] The device housing 1 has a movable groove inside for the outer needle connector 22 and the inner needle connector 33 to move. The housing 1 also has a retaining groove inside, and the surface of the outer needle button 23 has a retaining block that matches the retaining groove. The symmetrical distribution of the movable groove and the retaining groove ensures that the inner and outer needle assemblies 2 are simultaneously released from constraints during firing, achieving bidirectional linear motion and significantly improving action consistency. Furthermore, the outer needle button 23 and the inner needle button 34 form a symmetrical structure with their vertical center line as the axis of symmetry. This eliminates lateral torque caused by asymmetrical layout, ensuring the needle core moves linearly along the axial direction, preventing needle tip vibration or deviation, and improving sampling accuracy.

[0044] When the outer needle connector 22 and the inner needle connector 33 are engaged in the slot by the locking block, the firing part 42 can cause the locking block on the inner needle connector 33 to disengage from the slot. At this time, the inner needle connector 33 can strike the outer needle connector 22, causing the locking block on the outer needle connector 22 to disengage from the slot. This linkage triggering mechanism ensures that the inner and outer needle assemblies 2 unlock synchronously, and the firing process is without delay or misalignment, thus enhancing the stability and reliability of operation.

[0045] Meanwhile, to ensure the stable movement of the inner needle connector 33 and the outer needle connector 22, the power-charging firing assembly 4 includes a guide rod 43 located inside the device housing 1. The drive spring 41 is located on the surface of the guide rod 43, and a limiting member is provided on the surface of the guide rod 43 to divide the surface of the guide rod 43 into two sections. The inner needle connector 33 and the outer needle connector 22 are respectively connected to the two sections separated by the limiting member. The cooperation between the guide rod 43 and the limiting member can strictly constrain the movement path of the connectors, avoid energy loss or friction jamming caused by component swing, and ensure efficient transmission of firing power.

[0046] To allow the outer needle button 34 and the inner needle button 23 to move smoothly on the guide rod 43, both the outer needle button 34 and the inner needle button 23 can be provided with slots that are compatible with the guide rod 43, and one end of both the outer needle button 34 and the inner needle button 23 is exposed outside the device housing 1 for the operator to press.

[0047] As shown in the figure, the firing unit 42 includes a pressing plate 421 located inside the device housing 1, and a control button 422 located on the pressing plate 421. The locking structure 44 includes interlocking blocks located on the surface of the inner pin connector 33 and the pressing plate 421. The control button 422 can drive the pressing plate 421 to move, causing the pressing plate 421 to disengage from the interlocking blocks on the inner pin connector 33. The mechanical linkage design of the pressing plate 421 simplifies the operation process. By triggering the multi-stage locking structure 44 with a single control button 422, the operation complexity is reduced and the firing response speed is improved.

[0048] To achieve coordinated firing of the outer and inner needles, the outer needle button 23 has a linkage block 24 with a guide slope and a locking protrusion. The inner needle connector 33 has an impact block 35 that can contact the linkage block 24. The impact block 35 has a release slope that matches the guide slope on the outer needle connector 22. When the impact block 35 contacts the linkage block 24, the impact block 35 can use the release slope and guide slope to cause the linkage block 24 to disengage from the slot, smoothly transmitting the firing power, reducing component wear caused by instantaneous impact, and ensuring strict synchronous operation of the inner and outer needle assemblies 2.

[0049] In some embodiments, the top view of both the outer needle button 23 and the inner needle button 34 is U-shaped. The linkage block 24 and the impact block 35 are located at the ends of the outer needle button 23 and the inner needle button 34, respectively. The U-shaped button design is ergonomic and makes it easy for the operator to hold and apply force. At the same time, the end block layout further enhances symmetry, ensures uniform force during firing, and improves the consistency of the operating feel.

[0050] In the description of this technology, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0051] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A single-piece biopsy needle, characterized in that: include: Device casing (1); The external needle assembly (2) includes a biopsy external needle (21) disposed inside the device housing (1), an external needle connector (22) connected to the biopsy external needle (21), and an external needle button (23) connected to the external needle connector (22). The inner needle assembly (3) includes a biopsy inner needle (32) disposed inside the biopsy outer needle (21), an inner needle connector (33) connected to the biopsy inner needle (32), and an inner needle button (34) connected to the inner needle connector (33). The power-charging firing assembly (4) includes a drive spring (41) disposed inside the device housing (1) and a firing part (42) disposed on the surface of the device housing (1). The inner pin connector (33) and the outer pin connector (22) are both connected to the drive spring (41). A snap-fit ​​structure (44) is provided between the firing part (42) and the inner pin connector (33). The device housing (1) has an internal groove for the movement of the outer needle connector (22) and the inner needle connector (33). The device housing (1) has a slot inside, and the surface of the outer needle button (23) has a locking block that matches the slot. The outer pin button (23) and the inner pin button (34) are symmetrical in structure with their vertical center line as the axis of symmetry; When the outer needle connector (22) and the inner needle connector (33) are engaged in the slot by the locking block, the firing part (42) can cause the locking block on the inner needle connector (33) to disengage from the slot. At this time, the inner needle connector (33) can strike the outer needle connector (22), causing the locking block on the outer needle connector (22) to disengage from the slot.

2. The integrated biopsy needle according to claim 1, characterized in that: The power-charging assembly (4) includes a guide rod (43) disposed inside the housing (1) of the device, and the drive spring (41) is located on the surface of the guide rod (43).

3. The integrated biopsy needle according to claim 2, characterized in that: The guide rod (43) has a limiting member on its surface that divides the surface of the guide rod (43) into two sections. The inner needle connector (33) and the outer needle connector (22) are respectively connected to the two sections separated on the limiting member.

4. The integrated biopsy needle according to claim 1, characterized in that: The firing part (42) includes a pressing plate (421) disposed inside the device housing (1) and a control button (422) disposed on the pressing plate (421).

5. The integrated biopsy needle according to claim 4, characterized in that: The snap-fit ​​structure (44) includes interlocking blocks on the surfaces of the inner needle connector (33) and the pressing plate (421). The control button (422) can drive the pressing plate (421) to move, causing the interlocking blocks on the pressing plate (421) and the inner needle connector (33) to disengage from each other.

6. The integrated biopsy needle according to claim 1, characterized in that: The outer pin button (23) has a linkage block (24) with a guide slope and a locking protrusion. The inner pin connector (33) has an impact block (35) that can contact the linkage block (24). The impact block (35) has a release slope that matches the guide slope on the outer pin connector (22). When the impact block (35) contacts the linkage block (24), the impact block (35) can cause the linkage block (24) to disengage from the slot through the release slope and the guide slope.

7. The integrated biopsy needle according to claim 1, characterized in that: The top view of both the outer pin button (23) and the inner pin button (34) is U-shaped.

8. The integrated biopsy needle according to claim 6, characterized in that: The linkage block (24) and the impact block (35) are located at the ends of the outer needle button (23) and the inner needle button (34), respectively.

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