A time-delay biopsy device

Abstract

The application relates to a delayed biopsy device, which comprises an inner shell, an upper string structure, a sampling length adjusting structure and a sampling triggering structure, an inner needle and an outer needle are coaxially arranged on the upper string structure; the needle outlet end of the inner shell is a front end, the end far from the needle outlet end is a rear end, the sampling triggering structure and the upper string structure are sequentially arranged in the inner shell from the rear end to the front end; the sampling length adjusting structure is arranged on the inner shell and is in the stroke after the upper string structure is triggered, can adjust the needle outlet distance of the upper string structure and the sampling length; a limiting beam is arranged on the inner shell, the upper string structure can be clamped on the limiting beam after being strung; the sampling triggering structure can trigger the upper string structure twice to make the upper string structure separate from the limiting beam, and the inner needle and the outer needle are triggered in a delayed manner. The application can control the pressing block to adjust the triggering interval of the inner and outer needles, so that the efficiency and stability of triggering are improved.

Description

Technical Field

[0001] This application relates to the field of puncture equipment technology, and in particular to a delayed-action biopsy device. Background Technology

[0002] In modern medical practice, biopsy needles are crucial tools for obtaining tissue samples for pathological analysis. Traditional fully automated biopsy needle designs typically include an inner needle and an outer needle, which are activated sequentially via mechanical linkage. For example, in a prior art (CN215424811U), the inner needle is activated first, and then the inner needle hub strikes the outer needle hub, triggering the delayed activation of the outer needle, thereby completing the biopsy sampling.

[0003] In addition, another improved design (CN113171162B) introduces a pad and a linkage to compensate for the insufficient inner needle stroke after gear adjustment, ensuring that the inner needle can strike the outer needle seat, thereby activating the outer needle. However, this design increases the complexity of the transmission mechanism, leading to a decrease in the transmission efficiency of the activation structure and making the linkage activation of the outer needle unstable. Utility Model Content

[0004] Based on this, this application provides a delayed excitation biopsy device, which adjusts the excitation interval between the inner and outer needles by controlling the pressing block, so as to improve the excitation efficiency and stability.

[0005] To address the aforementioned problems, this invention provides a delayed-action biopsy device, comprising an inner needle, an outer needle, an inner shell, an upper chord structure, a sampling length adjustment structure, and a sampling activation structure.

[0006] The inner and outer needles are coaxially arranged on the upper chord structure;

[0007] The needle-out end of the inner shell is the front end, and the part away from the needle-out end is the rear end. The sampling excitation structure and the upper chord structure are arranged sequentially along the direction from the rear end to the front end inside the inner shell.

[0008] The sampling length adjustment structure is located on the inner shell and is in the stroke after the upper chord structure is excited, which can adjust the needle distance and sampling length of the upper chord structure;

[0009] A limiting beam is provided on the inner shell, and the upper chord structure can be locked onto the limiting beam after the upper chord is chorded.

[0010] The sampling excitation structure can excite the upper chord structure twice, causing it to detach from the limiting beam, thus achieving delayed excitation between the inner and outer needles.

[0011] Furthermore, the sampling excitation structure includes a pressing block, a first pressing seat, and a second pressing seat;

[0012] The first pressing seat and the second pressing seat are connected to each other on the inner housing; the pressing block is connected to the first pressing seat and the second pressing seat;

[0013] The pressing block has a first pressing surface and a second pressing surface arranged opposite to each other; the first pressing surface and the second pressing surface form a height difference at the bottom, and when the pressing block is pressed, the first pressing surface and the second pressing surface can act on the upper chord structure in turn.

[0014] Furthermore, the upper winding structure includes an outer needle seat and an inner needle seat, with the outer needle and inner needle respectively connected to the outer needle seat and the inner needle seat; the sampling length adjustment structure is provided with a short-range stop surface and a long-range stop surface.

[0015] When the inner and outer needles are activated at a short range, the short-range stop blocking surface prevents the outer needle seat and inner needle seat from colliding; when the inner and outer needles are activated at a long range, the long-range stop blocking surface prevents the outer needle seat and inner needle seat from colliding.

[0016] Furthermore, the upper rear end of the outer needle seat and the inner needle seat are respectively provided with an outer needle seat hook and an inner needle seat hook. After the upper winding structure is wound, the outer needle seat hook and the inner needle seat hook are engaged on the limiting beam. At this time, the outer needle seat hook and the inner needle seat hook are respectively located in the pressing stroke of the first pressing surface and the second pressing surface.

[0017] Furthermore, the pressing block is provided with a first leg and a second leg opposite to each other. The first leg and the second leg are engaged with the first pressing seat and the second pressing seat, initially providing pressing resistance to the pressing block. When pressing a distance H, the first leg and the second leg reach the critical crushing point, and the pressing resistance reaches its maximum. At this time, the second pressing surface acts on the upper chord structure. When pressing continues to the distance H, the pressing resistance decreases during this process, and the first leg and the second leg reach the lowest crushing point. At this time, the first pressing surface acts on the upper chord structure.

[0018] Furthermore, both the short-range and long-range blocking surfaces include two spaced-apart stepped surfaces, and the height difference between the two stepped surfaces controls the sampling and cutting length between the inner and outer needles.

[0019] Furthermore, the front ends of the outer needle seat and the inner needle seat are respectively provided with a first impact surface and a second impact surface, and the two impact surfaces respectively impact the two spaced step surfaces.

[0020] Furthermore, the upper chord structure also includes a first spring, a second spring, a first guide rod, and a second guide rod.

[0021] The first spring and the second spring are respectively sleeved on the first guide rod and the second guide rod; the first guide rod and the second guide rod are both connected to the inner housing.

[0022] Furthermore, the lower rear end of the outer needle seat and the inner needle seat are respectively provided with a first spring mounting hole and a second spring mounting hole, and the first guide rod and the second guide rod, which are sleeved on the first spring and the second spring, are respectively placed in the first spring mounting hole and the second spring mounting hole.

[0023] The rear ends of the first spring and the second spring abut against the inner housing, and the front ends abut against the front ends of the first spring mounting hole and the second spring mounting hole, respectively.

[0024] Furthermore, it also includes an outer shell, which is mounted on the inner shell;

[0025] The outer casing is provided with a sampling activation button, a gear adjustment lever, a first winding button, and a second winding button. The sampling activation button is configured to cooperate with the pressing block and is used to activate the pressing block. The gear adjustment lever is configured to cooperate with the sampling length adjustment structure and is used to adjust the position of the sampling length adjustment structure. The first winding button and the second winding button are respectively connected to the front end of the outer needle seat and the inner needle seat and are used to wind the winding structure.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] This invention features a limiting beam on the inner shell. After the upper chord structure is chorded, it can be engaged with the limiting beam. The sampling and excitation structure can excite the upper chord structure twice to disengage it from the limiting beam, thus achieving delayed excitation between the inner and outer needles. By controlling the pressing block, the excitation interval between the inner and outer needles is adjusted, improving the efficiency and stability of the excitation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the internal structure of the shell in an embodiment of the present utility model;

[0029] Figure 2 This is a schematic diagram of the upper chord structure from one perspective in an embodiment of the present utility model;

[0030] Figure 3 This is a schematic diagram of the upper chord structure from another perspective in an embodiment of this utility model;

[0031] Figure 4 This is a schematic diagram of the structure without the shell in an embodiment of this utility model;

[0032] Figure 5 This is a schematic diagram of the assembly of the shell and the sampling excitation structure in an embodiment of this utility model;

[0033] Figure 6 This is a schematic diagram of the curved appearance of the product in the embodiment of this utility model;

[0034] Figure 7 This is a cross-sectional view of the present invention along direction AA;

[0035] Figure 8 This is a cross-sectional view of the sampling length adjustment structure in an embodiment of this utility model;

[0036] Figure 9 This is a schematic diagram illustrating the working principle of the sampling length adjustment structure in this embodiment of the present invention.

[0037] Figure 10 This is a schematic diagram of the adjusting block structure in an embodiment of the present utility model;

[0038] Wherein: 1-Inner shell, 2-Limiting beam, 3-Pressing block, 31-First pressing seat, 32-Second pressing seat, 41-Outer needle seat hook, 42-Inner needle seat hook, 51-Outer needle seat, 52-Inner needle seat, 511-First impact surface, 512-Second impact surface, 531-Short-range stop surface, 532-Long-range stop surface, 6-Sampling length adjustment structure, 611-Short-range stop surface, 612-Long-range stop surface 61-First spring, 62-Second spring, 71-Inner needle, 72-Outer needle, 81-First guide rod, 82-Second guide rod, 91-First spring mounting hole, 92-First spring mounting hole, 300-Sampling trigger button, 301-First support leg, 302-Second support leg, 311-First pressing surface, 312-Second pressing surface, 400-Shift lever, 501-First winding button, 502-Second winding button. Detailed Implementation

[0039] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the scope of the present application.

[0040] This application provides a delayed-excitation biopsy device, such as... Figure 1 , 7 As shown, the device includes an inner needle 71, an outer needle 72, an inner shell 1, an upper chord structure, a sampling length adjustment structure 6, and a sampling activation structure. The inner needle 71 is used to penetrate tissue and collect samples, while the outer needle 72 cuts and seals the sample after the inner needle is retracted to prevent it from falling out. The inner needle 71 and the outer needle 72 are coaxially mounted on the upper chord structure. One end of the needle tip can be directly fixed to the upper chord structure, or the needle tip can be fixed by an additional fixing block before the fixing block is fixed to the upper chord structure.

[0041] The needle-exit end of the inner shell 1 is the front end, and the end furthest from the needle-exit end is the rear end. A sampling excitation structure and an upper chord structure are sequentially arranged within the inner shell 1 from the rear end to the front end. The upper chord structure provides excitation power for both the inner and outer needles. A sampling length adjustment structure 6 is located on the inner shell 1, within the stroke of the upper chord structure after excitation, and can adjust the needle-exit distance and sampling length of the upper chord structure. A limiting beam 2 is provided on the inner shell 1, allowing the upper chord structure to engage with the limiting beam 2 after being chordated. The sampling excitation structure controls the excitation sequence of the inner and outer needles, enabling the upper chord structure to be excited twice to disengage from the limiting beam 2, achieving delayed excitation between the inner needle 71 and the outer needle 72. By controlling the pressing block, the excitation interval between the inner and outer needles is adjusted, improving the efficiency and stability of the excitation process.

[0042] As one embodiment of this application, such as Figure 8 As shown, the sampling activation structure is a crucial component of the delayed-action biopsy device, responsible for controlling the sequential activation of the inner and outer needles. The sampling activation structure includes a pressing block 3, a first pressing seat 31, and a second pressing seat 32. These components work together to ensure that the inner needle 71 and outer needle 72 are activated precisely at predetermined time intervals. Specifically, as the primary contact point for user operation, the pressing block 3 is connected between the first pressing seat 31 and the second pressing seat 32, applying pressure manually or mechanically. The first pressing seat 31 and the second pressing seat 32 are connected relative to each other on the inner housing 1, providing stable support and ensuring the accurate movement path of the pressing block 3.

[0043] Two pressing surfaces of different heights, namely the first pressing surface 311 and the second pressing surface 312, are provided on the pressing block 3, creating a height difference at the bottom of the two pressing surfaces. For example, the height difference ranges from 1.5mm to 2mm, ensuring that a single press can sequentially activate the inner and outer needles with a time interval of 0.1 seconds to 0.5 seconds. This effectively controls the activation duration of the inner and outer needles and avoids the situation where only the inner needle is activated. This design allows the two pressing surfaces of the pressing block 3 to act on the upper winding structure in a time-division manner when the pressing block 3 is pressed, achieving delayed activation. For example, when the pressing block 3 is pressed, the first pressing surface 311 is first contacted. Due to its higher position, the first pressing surface 311 will act on the upper chord structure first, causing it to disengage from the limiting beam 2 and release the inner needle 71 for the first activation. As the pressing block 3 continues to press down, the second pressing surface 312 gradually approaches the upper chord structure. Since the second pressing surface 312 is located at a lower position, it will contact and trigger the upper chord structure at a later time, thereby delaying the activation time of the outer needle 72.

[0044] The time-sharing mechanism described above effectively prevents the risks associated with simultaneous activation of the inner and outer needles, ensuring surgical safety. Compared to complex mechanical linkage mechanisms, this design reduces the number of transmission components, lowers the likelihood of equipment failure, and improves overall stability.

[0045] For example, it also includes sensors and a microprocessor to monitor the position and force of the pressing block 3 in real time, and integrates a small display screen on the device to display the current excitation status, setting parameters and other information in real time, increasing transparency and interactivity, and ensuring that each excitation achieves the best effect.

[0046] As one embodiment of this application, such as Figure 4 As shown, the upper winding structure includes an outer needle seat 51 and an inner needle seat 52, with the outer needle 72 and inner needle 71 respectively connected to the outer needle seat 51 and the inner needle seat 52; Figure 10 As shown, the sampling length adjustment structure 6 is provided with a short-range stop surface 611 and a long-range stop surface 612. Both the short-range stop surface 611 and the long-range stop surface 612 include two stepped surfaces spaced apart. The height difference between the two stepped surfaces controls the sampling cutting length between the inner needle 71 and the outer needle 72. Preferably, four surfaces are designed, including, in sequence, a short-range outer needle stop surface, a long-range outer needle stop surface, a short-range inner needle stop surface, and a long-short-range inner needle stop surface.

[0047] For example, when short-range excitation is required, the short-range mode is selected, and the short-range stop surface 611 on the sampling length adjustment structure 6 is in the working position. When the inner and outer needles are excited, the inner needle seat 52 first impacts the outer needle seat 51. However, due to the obstruction of the short-range stop surface 611, the impact distance between the inner and outer needles is limited to a relatively short distance, thus achieving short-range sampling. When long-range excitation is required, the long-range mode is selected, and the long-range stop surface 612 on the sampling length adjustment structure 6 is in the working position. When the inner and outer needles are excited, the inner needle seat 52 also first impacts the outer needle seat 51. However, because the long-range stop surface 612 is located further away, the inner and outer needles can impact over a longer distance, thus achieving long-range sampling.

[0048] As one embodiment of this application, such as Figure 7 As shown, the upper rear ends of the outer needle seat 51 and the inner needle seat 52 are respectively provided with an outer needle seat hook 41 and an inner needle seat hook 42. After the upper winding structure completes the upper winding action, the two hooks will engage with the limiting beam 2, ensuring that the inner and outer needles are in a state of readiness for activation. At this time, the outer needle seat hook 41 and the inner needle seat hook 42 are respectively located in the pressing stroke of the first pressing surface 311 and the second pressing surface 312. This means that when the pressing block 3 is pressed, the two pressing surfaces will act on the outer needle seat hook 41 and the inner needle seat hook 42 in a time-sharing manner, realizing delayed activation and providing precise control for subsequent delayed activation. For example, a pressing surface can be provided in the middle of the hook body of the outer needle seat hook 41 and the inner needle seat hook 42, or a pressing surface can be provided separately at one end of the hook body. Pressing can satisfy the deformation of the hook and release the engagement with the limiting beam 2.

[0049] As one embodiment of this application, such as Figure 8 As shown, the pressing block 3 has a first leg 301 and a second leg 302 arranged opposite to each other. The first leg 301 and the second leg 302 are engaged with the first pressing seat 31 and the second pressing seat 32, providing pressing resistance to the pressing block 3 in the initial state. These two legs, engaged with the first pressing seat 31 and the second pressing seat 32, serve to support and transmit pressing force. Their design ensures that the pressing block 3 has different resistance characteristics at different pressing stages.

[0050] For example, such as Figure 9 As shown, in the unpressed state, the first leg 301 and the second leg 302 are in their initial positions, providing significant pressing resistance to prevent misoperation or accidental triggering. When the pressing block 3 is pressed to a distance of H1, the first leg 301 and the second leg 302 reach the critical crushing point, at which point the pressing resistance reaches its maximum. Simultaneously, the second pressing surface 312 begins to act on the first pressing surface 311 of the upper chord structure, causing the inner needle seat to disengage. Continuing to press the pressing block 3 to a distance of H2, the first leg 301 and the second leg 302 gradually reach the lowest crushing point, reducing the pressing resistance until the second pressing surface 312 acts on the upper chord structure, causing the outer needle seat to disengage. The leg design ensures precise delay in the activation of the inner and outer needles, improving the accuracy and reliability of sampling. Especially during the pressing process, by gradually increasing and releasing the pressing force, the activation sequence can be better controlled. The leg design reduces complex mechanical linkage mechanisms, lowers the possibility of equipment failure, and improves overall reliability. The activation of the inner and outer needles can be completed with a single continuous pressing action, simplifying the operation process.

[0051] As one embodiment of this application, such as Figure 2 , 4 As shown in Figure 5, the front ends of the outer needle seat 51 and the inner needle seat 52 are respectively provided with a first impact surface 511 and a second impact surface 512, which respectively impact two spaced-apart step surfaces. Exemplarily, when the pressing block 3 is pressed to a distance of H1, the second pressing surface 312 acts on the upper chord structure, releasing the inner needle seat 52. At this time, the inner needle seat 52 moves forward, and its front end's second impact surface 512 first impacts the step surface located in front. Because this step surface is relatively far away, the inner needle 71 is allowed to complete a longer stroke of the activation action, realizing the first activation of the inner needle. When the pressing block 3 is pressed to a distance of H2, the first pressing surface 311 acts on the upper chord structure, releasing the outer needle seat 51. At this time, the outer needle seat 51 moves forward, and its front end's first impact surface 511 impacts another step surface located closer to the rear end. Because this step surface is relatively close, the outer needle 72 completes a shorter stroke of the activation action at a later time, realizing the second activation of the outer needle.

[0052] As one embodiment of this application, such as Figure 4 , 7 As shown, the upper chord structure also includes a first spring 61, a second spring 62, a first guide rod 81, and a second guide rod 82. The first spring 61 and the second spring 62 are respectively sleeved on the first guide rod 81 and the second guide rod 82, providing necessary restoring force and buffering effect, reducing the impact of impact force on the equipment and tissue. The first guide rod 81 and the second guide rod 82 are both connected to the inner housing 1, ensuring that the outer needle seat 51 and the inner needle seat 52 move along a predetermined path, avoiding deviation or jamming.

[0053] As one embodiment of this application, such as Figure 7 As shown, the lower rear ends of the outer needle seat 51 and the inner needle seat 52 are respectively provided with a first spring mounting hole 91 and a second spring mounting hole 92. The first guide rod 81 and the second guide rod 82, which are fitted with the first spring 61 and the second spring 62, are respectively placed in the first spring mounting hole 91 and the second spring mounting hole 92. The rear ends of the first spring 61 and the second spring 62 abut against the inner housing 1, and the front ends abut against the front ends of the first spring mounting hole 91 and the second spring mounting hole 92, respectively.

[0054] As one embodiment of this application, such as Figure 6 As shown, it also includes an outer casing, mounted on the inner casing 1, providing protection and integrating all external operating components. The design of the outer casing not only enhances the overall aesthetics of the device but also provides a user-friendly interface. Exemplarily, the outer casing is equipped with a sampling activation button 300, a speed adjustment lever 400, a first winding button 501, and a second winding button 502. The sampling activation button 300 is configured to cooperate with the pressing block 3 to activate the pressing block 3. When the sampling activation button 300 is pressed, it transmits force to the pressing block 3, triggering the inner and outer needle seats to be activated sequentially. The speed adjustment lever 400 is configured to cooperate with the sampling length adjustment structure 6 to adjust the position of the sampling length adjustment structure 6. Different range modes (such as short range or long range) can be selected by moving the speed adjustment lever 400, thereby adjusting the sampling length. The first winding button 501 and the second winding button 502 are respectively connected to the front end of the outer needle seat 51 and the inner needle seat 52. By pressing these two buttons, the winding operation of the outer needle and the inner needle is completed respectively, in preparation for subsequent stimulation, and can also be used to remove and cut tissue after stimulation.

[0055] It should be noted that, in this application, the term "bottom" refers to the radial direction of the device away from the shift lever, "front end" refers to the needle outlet end of the inner housing, "rear end" refers to the end away from the needle outlet end, and "relative" means that one is provided on each of the left and right sides; "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the method, article, or apparatus that includes said element.

[0056] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0057] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0058] This application uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that for those skilled in the art, various modifications, combinations, sub-combinations, and substitutions can be made without departing from the principles of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A delayed-action biopsy device, comprising an inner needle (71) and an outer needle (72), characterized in that, Also includes: The inner shell (1), the upper chord structure, the sampling length adjustment structure (6), and the sampling excitation structure, The inner needle (71) and the outer needle (72) are coaxially arranged on the upper chord structure; The needle outlet end of the inner shell (1) is the front end, and the end away from the needle outlet end is the rear end. The inner shell (1) is provided with a sampling excitation structure and an upper chord structure in sequence along the direction from the rear end to the front end. The sampling length adjustment structure (6) is set on the inner shell (1) and is in the stroke after the upper chord structure is excited, which can adjust the needle distance and sampling length of the upper chord structure; A limiting beam (2) is provided on the inner shell (1), and the upper chord structure can be snapped onto the limiting beam (2) after the upper chord structure is chorded; The sampling excitation structure can excite the upper chord structure twice to make it detach from the limiting beam (2), thus achieving delayed excitation between the inner needle (71) and the outer needle (72).

2. The delayed-action biopsy device as described in claim 1, characterized in that, The sampling excitation structure includes a pressing block (3), a first pressing seat (31), and a second pressing seat (32); The first pressing seat (31) and the second pressing seat (32) are connected to each other on the inner shell (1); the pressing block (3) is connected to the first pressing seat (31) and the second pressing seat (32); The pressing block (3) is provided with a first pressing surface (311) and a second pressing surface (312) opposite to each other; the first pressing surface (311) and the second pressing surface (312) form a height difference at the bottom. When the pressing block (3) is pressed, the first pressing surface (311) and the second pressing surface (312) can act on the upper chord structure in turn.

3. The delayed-action biopsy device as described in claim 2, characterized in that, The upper winding structure includes an outer needle seat (51) and an inner needle seat (52), with the outer needle (72) and inner needle (71) respectively connected to the outer needle seat (51) and the inner needle seat (52); the sampling length adjustment structure (6) is provided with a short range stop surface (611) and a long range stop surface (612). When the inner needle (71) and outer needle (72) are activated by short-range firing, the short-range stop blocking surface (611) blocks the impact of the outer needle seat (51) and inner needle seat (52); when the inner needle (71) and outer needle (72) are activated by long-range firing, the long-range stop blocking surface (612) blocks the impact of the outer needle seat (51) and inner needle seat (52).

4. The delayed-action biopsy device as described in claim 3, characterized in that, The outer needle seat (51) and inner needle seat (52) are respectively provided with an outer needle seat hook (41) and an inner needle seat hook (42) on the upper part of their rear ends. After the upper chord structure is chord, the outer needle seat hook (41) and the inner needle seat hook (42) are engaged on the limiting beam (2). At this time, the outer needle seat hook (41) and the inner needle seat hook (42) are respectively located in the pressing stroke of the first pressing surface (311) and the second pressing surface (312).

5. The delayed-excitation biopsy device as described in claim 2, characterized in that, The pressing block (3) is provided with a first leg (301) and a second leg (302) opposite to each other. The first leg (301) and the second leg (302) are engaged with the first pressing seat (31) and the second pressing seat (32). In the initial state, the pressing block (3) provides pressing resistance. When pressing a distance of H1, the first leg (301) and the second leg (302) reach the critical crushing point, and the pressing resistance reaches the maximum. At this time, the second pressing surface (312) acts on the upper chord structure. When pressing continues to the distance of H2, the pressing resistance decreases during this process, and the first leg (301) and the second leg (302) reach the lowest crushing point. At this time, the first pressing surface (311) acts on the upper chord structure.

6. The delayed-action biopsy device as described in claim 3, characterized in that, Both the short-range stop surface (611) and the long-range stop surface (612) contain two stepped surfaces spaced apart, and the height difference between the two stepped surfaces controls the sampling cutting length between the inner needle (71) and the outer needle (72).

7. The delayed-excitation biopsy device as described in claim 3 or 4, characterized in that, The front ends of the outer needle seat (51) and the inner needle seat (52) are respectively provided with a first impact surface (511) and a second impact surface (512), and the two impact surfaces respectively impact the two spaced step surfaces.

8. The delayed-action biopsy device as described in claim 3 or 4, characterized in that, The upper chord structure also includes a first spring (61), a second spring (62), a first guide rod (81), and a second guide rod (82). The first spring (61) and the second spring (62) are respectively sleeved on the first guide rod (81) and the second guide rod (82); the first guide rod (81) and the second guide rod (82) are both connected to the inner shell (1).

9. The delayed-action biopsy device as described in claim 8, characterized in that, The lower rear end of the outer needle seat (51) and the inner needle seat (52) are respectively provided with a first spring mounting hole (91) and a second spring mounting hole (92). The first guide rod (81) and the second guide rod (82) fitted with the first spring (61) and the second spring (62) are respectively placed in the first spring mounting hole (91) and the second spring mounting hole (92). The rear ends of the first spring (61) and the second spring (62) abut against the inner housing (1), and the front ends abut against the front ends of the first spring mounting hole (91) and the second spring mounting hole (92), respectively.

10. The delayed-action biopsy device as described in claim 3, characterized in that, It also includes an outer shell, which is installed on the inner shell (1); The outer casing is provided with a sampling activation button (300), a gear shifting lever (400), a first winding button (501), and a second winding button (502). The sampling activation button (300) is configured to cooperate with the pressing block (3) to activate the pressing block (3). The gear shifting lever (400) is configured to cooperate with the sampling length adjustment structure (6) to adjust the position of the sampling length adjustment structure (6). The first winding button (501) and the second winding button (502) are respectively connected to the front end of the outer needle seat (51) and the inner needle seat (52) to wind the winding structure.

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