A human tissue extraction and puncture device with adjustable firing force

Abstract

This utility model relates to the field of medical device technology and discloses an adjustable firing force human tissue extraction and puncture device, including a needle assembly, a mounting shell, a firing mechanism, and an adjustment mechanism. The adjustment mechanism includes an adjustment wheel and a threaded column, which can drive the spring support of the firing mechanism to move, continuously adjusting the preload of the drive spring to adapt to the puncture and sampling needs of human tissues with different hardness. The needle assembly includes a coaxial inner needle and an outer needle. The inner needle is provided with a sampling groove with a shearing edge, and the front end of the outer needle is provided with a cutting bevel. The two can form a shearing cooperation to cut the tissue. This utility model adapts to different tissues by adjusting the firing force, and replaces the traditional compression and breakage with active shearing, significantly improving the success rate and sample quality of puncture and sampling, especially suitable for clinical sampling of tough tissues such as liver fibrosis and cirrhosis.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a human tissue extraction and puncture device with adjustable firing force. Background Technology

[0002] Medical puncture devices used to extract tissue media from the human body are core specialized devices for in vivo tissue sampling and pathological analysis in clinical interventional procedures. Liver tissue puncture sampling is a crucial method for diagnosing liver diseases, and the integrity of the sample directly determines the accuracy of in vivo testing and pathological diagnosis. Currently, various semi-automatic or fully automatic human tissue extraction puncture devices are widely used in clinical practice. These devices mainly consist of a needle assembly and a handle assembly. Their working process is as follows: after the inner needle punctures the diseased tissue and compresses it into the sampling groove at the front end of the inner needle, the compressed outer needle drive spring is released. The spring's restoring force propels the outer needle forward at high speed along the outer wall of the inner needle, thereby cutting and encapsulating the tissue within the sampling groove, ultimately removing the target tissue sample intact from the body.

[0003] However, the spring-driven force of existing human tissue extraction puncture devices is fixed at the factory and cannot be adjusted according to actual clinical needs. In clinical puncture sampling scenarios, the texture of the target human tissue varies significantly due to different degrees of lesions such as fatty degeneration, fibrosis, or cirrhosis. The fixed driving force may experience power attenuation at the end of the firing stroke when facing tough tissues, which is insufficient to overcome the extremely high tissue shear resistance, resulting in the outer needle failing to completely close the sampling groove. In addition, traditional puncture needle tip structures mostly rely on the pressure of the outer needle tip against the tissue to achieve breakage, resulting in low cutting efficiency. In cases where the puncture is not completely closed, the target tissue sample is easily not completely cut and slips out during needle withdrawal, leading to sampling failure or insufficient sample volume, affecting the accuracy of subsequent pathological diagnosis. Therefore, there is an urgent need to improve the existing technology to solve the problem of unstable sampling success rate when facing human tissues of different hardness due to the non-adjustable driving force and poor cutting mechanism of existing human tissue extraction puncture devices. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a human tissue extraction and puncture device with adjustable firing force to solve the problems of existing tissue sampling and puncture devices being unable to adapt to human tissues of different hardness and having unstable puncture and sampling success rates.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An adjustable firing force human tissue extraction and puncture device includes a needle assembly, a mounting housing, and a firing mechanism disposed within the mounting housing; the mounting housing has a spring cavity, and the firing mechanism includes a movable chamber slidably disposed within the spring cavity, a spring, and a spring support, with both ends of the spring abutting against the movable chamber and the spring support respectively; the needle assembly includes an inner needle and an outer needle coaxially disposed, the proximal end of the outer needle being connected to the movable chamber, and the inner needle passing through the interior of the outer needle.

[0006] An adjustment mechanism is provided at the rear end of the mounting housing. The adjustment mechanism includes an adjustment wheel and a threaded post. A threaded hole is provided at the rear end of the mounting housing. The threaded post is threaded into the threaded hole. One end of the threaded post is fixedly connected to the adjustment wheel, and the other end extends into the mounting housing and abuts against the side of the spring support opposite to the spring. By rotating the adjustment wheel, the threaded post can be driven to move axially forward and backward, thereby pushing the spring support to move within the mounting housing, thus adjusting the compression preload of the spring.

[0007] The inner needle includes a puncture needle tip and a needle core. The needle core is provided with a sampling groove, and the sampling groove has a shearing edge on one side edge near the puncture needle tip. The front end face of the outer needle is provided with a cutting bevel that cooperates with the inner needle. When the outer needle is driven forward and closed by the spring, the cutting bevel and the shearing edge form a shearing engagement.

[0008] Furthermore, the outer diameter of the needle core is smaller than the outer diameter of the puncture needle, and an annular stepped slope is formed at the connection between the two. The inner wall of the front end of the outer needle slides in conjunction with the outer wall of the needle core. The inclination angle of the cutting slope is consistent with the inclination angle of the stepped slope. When the outer needle is in the closed state, the cutting slope and the stepped slope are in close contact.

[0009] Furthermore, a predetermined distance is provided axially between the edge of the sampling groove near the puncture needle and the inclined surface of the step.

[0010] Furthermore, the rear end of the mounting housing is provided with a semi-enclosed elastic adjustment chamber, and the side wall of the elastic adjustment chamber is provided with an adjustment window for finger operation; the adjustment wheel is rotatably disposed in the elastic adjustment chamber, and the threaded post is integrally formed or fixedly connected to the adjustment wheel.

[0011] Furthermore, it also includes a pull rod and a pull block; the rear end wall of the elastic adjustment chamber, the adjustment wheel, the threaded column, and the spring support are all coaxially provided with through holes for the pull rod to pass through; one end of the pull rod is fixedly connected to the movable chamber, and the other end passes through the through holes of the spring, the spring support, the threaded column, and the adjustment wheel in sequence, extending to the outside of the mounting housing and being fixedly connected to the pull block; the pull block is configured to be able to pull the movable chamber backward along the axial direction to compress the spring.

[0012] Furthermore, the bottom wall of the spring cavity is provided with an elastic buckle, and the bottom of the movable compartment is provided with a groove that cooperates with the elastic buckle; when the movable compartment moves backward to a predetermined position, the elastic buckle engages in the groove to lock the movable compartment.

[0013] Furthermore, both the bottom of the movable compartment and the spring support are provided with a slider, and the inner wall of the spring cavity is provided with a guide groove that cooperates with the slider.

[0014] Furthermore, the rear end of the mounting housing is provided with a safety seat, and the safety seat has a guide groove and a safety hole that are perpendicularly connected to each other; a guide plate is fixedly provided on the pull block, and the guide plate slides through the guide groove; a safety pin is inserted into the safety hole, and the safety pin has a clearance hole for the guide plate to pass through; when the safety pin is inserted and the clearance hole is misaligned with the guide plate, the movement path of the guide plate is blocked by the safety pin.

[0015] Furthermore, the lower part of the mounting housing is provided with two finger rings for fingers to pass through, and the top of the mounting housing is provided with a cover plate.

[0016] This invention discloses an adjustable-force human tissue extraction puncture device, the core of which integrates a steplessly adjustable spring preload mechanism and a puncture needle assembly with active shearing function. Compared with existing technologies, this invention has significant advantages: by setting a threaded-driven elastic adjustment mechanism, doctors can adjust the puncture force in real time according to the hardness of the patient's target tissue (such as whether the patient has cirrhosis), adapting to the operational needs of human tissue extraction puncture sampling in different clinical scenarios. For tough tissues, the preload is increased to compensate for the force attenuation at the end of the spring stroke, ensuring that the outer needle still has sufficient cutting kinetic energy at the moment of closure. The puncture needle assembly adopts a design that combines a shearing edge and a cutting bevel, transforming traditional blunt compression fracture into efficient misaligned shearing, significantly reducing the critical force required to cut tough fibrous tissue, effectively preventing the "blank shot" phenomenon caused by incomplete tissue cutting, ensuring the integrity and pass rate of the extracted tissue sample, and greatly improving the stability and success rate of human tissue extraction puncture sampling operations. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention.

[0018] Figure 2 A schematic diagram of the overall structure of an embodiment of this utility model. Figure 1 .

[0019] Figure 3 A schematic diagram of the overall structure of an embodiment of this utility model. Figure 2 .

[0020] Figure 4 for Figure 2 A magnified view of a portion of region A and a partial cross-sectional view of the structure in that region.

[0021] Figure 5 This is a schematic diagram of the firing mechanism in an embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram showing the cooperation between the safety seat, safety pin, and guide plate on the pull block in an embodiment of this utility model.

[0023] Figure 7 This is a schematic diagram of the structure of the adjusting wheel and the threaded column in an embodiment of this utility model.

[0024] The reference numerals in the attached figures are explained as follows: 10. Needle assembly; 11. Inner needle; 111. Puncture needle; 112. Needle core; 113. Sampling groove; 114. Shearing edge; 115. Stepped bevel; 12. Outer needle; 121. Cutting bevel; 20. Mounting housing; 21. Spring cavity; 211. Guide groove; 22. Rear end; 23. Threaded hole; 24. Elastic adjustment chamber; 241. Adjustment window; 242. Rear end wall; 25. Finger ring buckle; 26. Cover plate; 31. Movable chamber; 311. Slot; 312. Slider; 32. Spring; 33. Spring support; 40. Adjustment mechanism; 41. Adjustment wheel; 42. Threaded post; 51. Pull rod; 52. Pull block; 521. Guide plate; 61. Elastic buckle; 70. Safety seat; 71. Guide groove; 72. Safety hole; 73. Safety pin; 731. Clearance hole. Detailed Implementation

[0025] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 this utility model.

[0027] Existing human tissue extraction and puncture devices generally employ a spring-driven system with a fixed preload, and the inner and outer needles typically use a simple push-type closure. When dealing with tough lesions such as those caused by cirrhosis, the fixed driving force is often insufficient to meet the tissue sampling and cutting requirements of different scenarios. Furthermore, the passive push-type cutting is inefficient and can easily lead to the outer needle not completely covering the sampling slot, resulting in "empty gun" or sample slippage. Consequently, the stability and success rate of human tissue extraction and sampling operations cannot be guaranteed.

[0028] Based on this, and to improve the problems in related technologies, this utility model provides a human tissue extraction and puncture device with adjustable firing force, such as... Figures 1 to 4 As shown: The human tissue extraction and puncture device includes a needle assembly 10, a mounting housing 20, and a firing mechanism disposed within the mounting housing 20; the mounting housing 20 has a spring cavity 21, and the firing mechanism includes a movable chamber 31 slidably disposed within the spring cavity 21, a spring 32, and a spring support 33, with the two ends of the spring 32 abutting against the movable chamber 31 and the spring support 33 respectively; the needle assembly 10 includes an inner needle 11 and an outer needle 12 coaxially disposed, with the proximal end of the outer needle 12 connected to the movable chamber 31, and the inner needle 11 passing through the interior of the outer needle 12 and its proximal end being fixed relative to the mounting housing 20 by a fixing structure, for cooperating to complete the puncture and media extraction sampling operation of the human target tissue.

[0029] The rear end 22 of the mounting housing 20 is provided with an adjustment mechanism 40, which includes an adjustment wheel 41 and a threaded post 42. A threaded hole 23 is provided on the rear end 22, and the threaded post 42 is threadedly connected to the threaded hole 23. One end of the threaded post 42 is fixedly connected to the adjustment wheel 41, and the other end extends into the mounting housing 20 and axially abuts against the side end face of the spring support 33 opposite to the spring 32. By rotating the adjustment wheel 41, the threaded post 42 can be driven to move axially, thereby pushing the spring support 33 to slide in the spring cavity 21, thereby changing the preload of the spring 32 and adjusting the firing force to adapt to the differentiated operational needs of extracting and sampling human tissue puncture media with different hardness. The inner needle 11 includes a puncture needle head 111 and a needle core 112. The needle core 112 is provided with a sampling groove 113 for accommodating the target tissue sample. The sampling groove 113 is provided with a shearing edge 114 on one side edge near the puncture needle head 111. The front end face of the outer needle 12 is provided with a cutting bevel 121 that cooperates with the inner needle 11. When the outer needle 12 is driven forward and closed by the spring 32, the cutting bevel 121 and the shearing edge 114 form a shearing engagement, thereby achieving complete severing of the target tissue and ensuring the success rate of tissue sampling for human tissue extraction.

[0030] It is understood that the mounting shell 20, serving as the main support structure, is typically injection-molded from medical-grade polymer material, with the internal spring cavity 21 being an elongated hollow cavity. The movable chamber 31 reciprocates linearly within the spring cavity 21, driving the outer needle 12 to fire and complete the cutting action for tissue sampling. The inner needle 11 is usually fixed to the front end of the mounting shell 20 or kept relatively stationary when the outer needle is fired via an independent locking mechanism, providing stable support and shearing reference for tissue sampling.

[0031] The core improvement of this embodiment lies in the introduction of an adjustment mechanism 40, which is combined with an active shearing puncture needle assembly 10 to fully adapt to the needs of human tissue extraction and sampling in different clinical scenarios. Before the procedure, the doctor can assess the hardness of the target tissue based on imaging examinations and rotate the adjustment wheel 41. The adjustment wheel 41 drives the threaded column 42 to rotate in or out, directly and linearly pushing or pulling back the spring support 33, thereby adjusting the initial compression (i.e., preload) of the spring 32, and thus achieving precise control of the firing force. For tough cirrhotic tissue, the spring preload can be increased in advance to ensure sufficient kinetic energy at the end of firing to drive the outer needle 12 to close completely, ensuring smooth extraction of the tough tissue. Simultaneously, the cutting bevel 121 at the front end of the outer needle 12 and the shearing edge 114 at the edge of the sampling groove 113 form a shearing pair similar to scissors. Upon firing, the high-speed moving outer needle 12 has a relative misalignment between its cutting bevel 121 and the fixed shearing edge 114, thereby generating a highly efficient shearing force on the tissue stuck in the groove and actively cutting it off. Compared with the traditional method of simply relying on the outer needle end face to push the tissue to break it off, this method cuts more thoroughly, causes less compression damage to tissue cells, ensures the integrity and pass rate of the extracted tissue sample, and significantly improves the success rate and sample quality of human tissue extraction and puncture sampling.

[0032] Alternatively, in some embodiments, such as Figure 4 As shown, the outer diameter of the needle core 112 is smaller than the outer diameter of the puncture needle 111, and an annular stepped inclined surface 115 is formed at the connection between the two. The inclination angle of the cutting inclined surface 121 matches the inclination angle of the stepped inclined surface 115. When the outer needle 12 is in the closed state, the cutting inclined surface 121 and the stepped inclined surface 115 are tightly fitted together.

[0033] It is understandable that the outer diameter of the puncture needle 111 is consistent with the outer diameter of the outer needle 12, so that the needle tip in the closed state forms a smooth cylindrical surface during puncture. This structural design ensures that the overall needle tip is streamlined after puncture, which helps reduce tissue damage and facilitates needle withdrawal after puncture and sampling. More importantly, when the outer needle 12 is fired into position, its cutting bevel 121 fits against the stepped bevel 115 of the inner needle 11. This surface contact serves as a reliable mechanical limit, preventing the outer needle 12 from excessively advancing; on the other hand, it forms a seal on the front end of the sampling groove 113. The fitting bevels close the front opening of the sampling groove, ensuring that the tissue sample is completely enclosed within the groove, preventing sample slippage during extraction, and further ensuring the reliability of human tissue extraction and sampling operations.

[0034] Alternatively, in some embodiments, such as Figures 1 to 4 As shown, there is an axial gap between the side of the sampling groove 113 near the puncture needle 111 and the stepped inclined surface 115.

[0035] This spacing is a stroke redundancy reserved for reliable shearing. It ensures that after the cutting bevel 121 of the outer needle 12 completes the tissue cutting action by passing the shearing edge 114, it still has a "over-stroke" stroke to continue forward before finally contacting and stopping at the stepped bevel 115. If the cutting edge is close to the stepped bevel, if there are minor errors in processing or tissue debris accumulation, the outer needle may be blocked and stopped by the stepped bevel before the cutting edge is completely sealed. This distance ensures that even if there are minor manufacturing tolerances, part wear, or slight jamming due to extremely tough tissue, the shearing action still has enough space to be completely performed, avoiding the risk that the outer needle 12 only clamps the tissue without cutting it, and structurally eliminating the hidden danger of failure in human tissue extraction and sampling.

[0036] Alternatively, in some embodiments, such as Figures 1 to 4 As shown, a spring adjustment chamber 24 is fixedly provided at the rear end of the housing 20, and an adjustment window 241 is provided on the side wall of the spring adjustment chamber 24; the adjustment wheel 41 is rotatably accommodated in the spring adjustment chamber 24, and the threaded column 42 is coaxially fixed with the adjustment wheel 41.

[0037] The elastic adjustment chamber 24 is a rearward extension of the mounting housing 20, serving a protective and containment function. Its semi-enclosed structure protects the adjustment wheel 41, effectively preventing accidental contact during busy puncture sampling preparation or operation that could alter the preset preload, ensuring the stability of the firing force parameters and the controllability of the tissue extraction and sampling operation. The side adjustment window 241 provides a convenient operating channel, allowing the doctor to move the adjustment wheel 41 with their finger or a simple tool. Alternatively, clearly marked graduations or markings can be provided on the rim of the adjustment wheel 41 facing the adjustment window 241, working in conjunction with the indicators on the elastic adjustment chamber 24 to provide users with a more intuitive reference for force levels, facilitating quick matching of the corresponding firing force according to different tissue sampling types.

[0038] Alternatively, in some embodiments, such as Figure 3 and Figure 7 As shown, it also includes a pull rod 51 and a pull block 52; through holes are coaxially opened on the adjusting wheel 41, the threaded column 42 and the spring support 33; one end of the pull rod 51 is fixedly connected to the movable chamber 31, and the other end passes through the through holes on the spring support 33, the threaded column 42 and the adjusting wheel 41 in sequence and extends to the outside of the elastic adjustment chamber 24, and is fixedly connected to the pull block 52; pulling the pull block 52 backward can drive the movable chamber 31 to compress the spring 32, and complete the firing energy storage preparation before the puncture sampling operation.

[0039] This design employs a coaxial, penetrating, compact layout, cleverly integrating the winding (energy storage) mechanism and the force adjustment mechanism onto the same axis. The pull rod 51, acting as the central axis for force transmission, transmits the pulling action from the rear end to the movable chamber 31 located within the front spring cavity. The through-hole design ensures that each component operates independently without interference: the adjusting wheel 41 adjusts the position of the spring support 33 when rotating, while the pull rod 51 slides freely axially within the central hole. This coaxial, penetrating design maximizes the use of the device's axial space, ensuring that the radial volume of the device is not significantly increased despite the addition of the adjusting and winding mechanisms, maintaining its compactness and lightness, and meeting the handheld operation requirements for clinical human tissue extraction and puncture sampling. The pulling block 52, located at the very end of the device, aligns with the doctor's intuitive action of pulling the lever backward. Simultaneously, this structure decouples the adjustment of the spring force (changing the support position) from the firing of the winding mechanism (changing the movable chamber position) in the mechanical path, ensuring that they do not affect each other, guaranteeing the stability and reliability of the mechanism's operation, and providing a stable power output for human tissue extraction and puncture sampling.

[0040] Alternatively, in some embodiments, such as Figures 1 to 4 As shown, the bottom wall of the spring cavity 21 is provided with an elastic buckle 61, and the bottom of the movable chamber 31 is provided with a groove 311 that cooperates with the elastic buckle 61. When the movable chamber 31 moves backward to the predetermined position, the elastic buckle 61 is engaged in the groove 311 to lock the movable chamber 31, thus completing the locking of the ready-to-fire state before puncture sampling.

[0041] The elastic latch 61 and the slot 311 constitute a mechanical firing and locking mechanism. When the movable chamber 31 is pulled to the end position of the upper winding, the elastic latch 61 quickly engages with the slot 311 under its own elastic force, often accompanied by a clear "click," providing the operator with clear auditory and tactile feedback, indicating that the device is ready to fire and that the spring 32 has reliably stored energy. This locking mechanism must have sufficient holding force to withstand the reaction force of the high-preload spring, preventing accidental release and ensuring the safety of human tissue extraction and puncture sampling operations. Upon firing, the locking is released by pressing the pull block 52, and the spring 32 drives the movable chamber 31 forward at high speed, instantly completing the tissue cutting and sampling action. This simple structure, rapid response, and high reliability are key to ensuring the instantaneous completion of the firing action, providing a core guarantee for the cutting effect of human tissue extraction and sampling.

[0042] Alternatively, in some embodiments, such as Figure 3 and Figure 5 As shown, both the bottom of the movable chamber 31 and the spring support 33 are provided with sliders 312, and the inner wall of the spring cavity 21 is provided with guide grooves 211 that slide in cooperation with the sliders 312.

[0043] The guide groove 211 and the slider 312 provide precise linear guidance and anti-rotation for the moving parts. For the movable chamber 31, this guide ensures that it and the outer needle 12 can only move in a straight line along the axial direction, preventing any form of rotation. This ensures that the cutting bevel 121 at the front end of the outer needle 12 always maintains the correct spatial orientation with the shearing edge 114 of the inner needle 11. This is a prerequisite for effective shearing and ensuring the cutting effect of tissue extraction and sampling. For the spring support 33, this guide structure restricts its circumferential rotation, forcing it to convert rotational motion into pure axial translation when the adjusting wheel 41 drives the threaded column 42 to rotate. This precisely changes the compression of the spring 32, achieving precise adjustment of the firing force to adapt to the tissue extraction and sampling needs of different tissues. This design ensures the accuracy and repeatability of the entire mechanism's motion trajectory, guaranteeing the consistency and stability of each tissue extraction and puncture sampling operation.

[0044] Alternatively, in some embodiments, such as Figure 3 and Figure 6 As shown, a safety seat 70 is also provided at the rear end of the housing 20. The safety seat 70 has a vertical guide groove 71 and a horizontal safety hole 72 that are interconnected. A guide plate 521 is fixedly provided on the pull block 52. The guide plate 521 slides through the guide groove 71. A safety pin 73 is inserted into the safety hole 72. The safety pin 73 has a clearance hole 731 for the guide plate 521 to pass through. When the safety pin 73 is inserted and the guide plate 521 moves to a position that is offset from the clearance hole 731, the guide plate 521 is blocked by the safety pin 73.

[0045] This is a physical isolation safety mechanism designed to absolutely prevent accidental firing and fully guarantee the clinical safety of human tissue extraction and puncture sampling operations. After the device is wound and locked, the doctor can push the safety pin 73 into the safety hole 72. If the clearance hole 731 is not aligned with the guide plate 521 at this time, the physical part of the safety pin 73 will directly block the forward path of the guide plate 521 (fixed to the pull block 52 and the movable chamber 31). At this time, even if the firing locking mechanism (elastic latch 61) is accidentally triggered and released, the forward movement of the movable chamber 31 under the action of the spring 32 will immediately stop because the guide plate 521 is physically blocked by the safety pin 73, preventing the outer needle 12 from firing and thus eliminating the risk of accidental injury. Only after the doctor confirms the puncture position is correct and is ready for sampling, can the safety pin 73 be pulled out or pushed to the clearance hole 731 aligned with the guide plate 521 to release the physical obstruction, and the device will then enter the firing state.

[0046] Alternatively, in some embodiments, such as Figures 1 to 3 As shown, the mounting housing 20 is provided with a ring buckle 25, and the top of the mounting housing 20 is provided with a removable cover plate 26.

[0047] The ring buckle 25 provides doctors with a stable grip point, facilitating the application of force for winding, adjustment, and other actions during one-handed operation, thus enhancing the stability and convenience of human tissue extraction and puncture sampling operations. The removable cover 26 facilitates necessary maintenance, cleaning, or parts replacement of the internal mechanisms of the mounting housing 20 (such as the spring 32, movable compartment 31, etc.), extending the product's service life and facilitating assembly and debugging before leaving the factory.

[0048] The working principle of the entire device is as follows: In use, the doctor first adjusts the spring 32 preload by rotating the adjusting wheel 41 through the adjusting window 241, based on the hardness of the patient's target tissue, to match the firing force required for this tissue extraction and puncture sampling operation. Then, pulling the pulling block 52 backward causes the movable chamber 31 and outer needle 12 to move backward via the pull rod 51, compressing the spring 32 until the elastic buckle 61 engages with the slot 311 and locks, at which point the sampling slot 113 is fully exposed. The safety pin 73 can be inserted and kept locked to prevent accidental triggering and ensure the safety of pre-puncture preparation. Under image guidance, the needle assembly 10 is inserted into the target tissue, causing the tissue to be squeezed into the sampling slot 113. After confirming the position, the safety pin 73 is released, triggering the firing mechanism. The elastic buckle 61 disengages, the spring 32 releases energy, and the movable chamber 31 and outer needle 12 propel forward at high speed. The cutting bevel 121 of the outer needle 12 engages with the shearing edge 114 of the sampling groove 113 to cut the tissue within the groove. The outer needle 12 then continues forward, its cutting bevel 121 tightly fitting with the stepped bevel 115 of the inner needle 11, completing the final closure and sealing the target tissue sample completely within the sampling groove 113. Finally, the entire device is pulled out, yielding the completely extracted and sealed tissue sample within the sampling groove 113, thus completing the human tissue extraction and sampling operation.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A human tissue extraction and puncture device with adjustable firing force, comprising a needle assembly, a mounting housing, and a firing mechanism disposed within the mounting housing; the mounting housing has a spring cavity, the firing mechanism includes a movable chamber slidably disposed within the spring cavity, a spring, and a spring support, the two ends of the spring respectively abutting against the movable chamber and the spring support; the needle assembly includes an inner needle and an outer needle coaxially disposed, the proximal end of the outer needle being connected to the movable chamber, and the inner needle passing through the interior of the outer needle; characterized in that, An adjustment mechanism is provided at the rear end of the mounting housing. The adjustment mechanism includes an adjustment wheel and a threaded post. A threaded hole is provided on the rear end of the mounting housing. The threaded post is threaded into the threaded hole. One end of the threaded post is fixedly connected to the adjustment wheel, and the other end extends into the mounting housing and abuts against the side of the spring support opposite to the spring. By rotating the adjustment wheel, the threaded post can be driven to move axially forward and backward, thereby pushing the spring support to move within the mounting housing, thus adjusting the compression preload of the spring. The inner needle includes a puncture needle tip and a needle core. The needle core is provided with a sampling groove, and the sampling groove has a shearing edge on one side edge near the puncture needle tip. The front end face of the outer needle is provided with a cutting bevel that cooperates with the inner needle. When the outer needle is driven forward and closed by the spring, the cutting bevel and the shearing edge form a shearing engagement.

2. The tunable firing force human tissue extraction puncturing device of claim 1, wherein: The outer diameter of the needle core is smaller than the outer diameter of the puncture needle, and an annular stepped slope is formed at the connection between the two. The inner wall of the front end of the outer needle slides in conjunction with the outer wall of the needle core. The inclination angle of the cutting slope matches the inclination angle of the stepped slope. When the outer needle is in the closed state, the cutting slope and the stepped slope are in close contact.

3. The tunable firing force human tissue extraction puncturing device of claim 2, wherein: A predetermined distance is provided axially between the edge of the sampling groove near the puncture needle and the inclined surface of the step.

4. The tunable firing force human tissue extraction puncturing device of claim 1, wherein: The rear end of the mounting housing is provided with a semi-enclosed elastic adjustment chamber, and the side wall of the elastic adjustment chamber is provided with an adjustment window for finger operation; the adjustment wheel is rotatably disposed in the elastic adjustment chamber, and the threaded column is integrally formed or fixedly connected to the adjustment wheel.

5. The tunable firing force human tissue extraction puncturing device of claim 4, wherein: It also includes a pull rod and a pull block; the rear end wall of the elastic adjustment chamber, the adjustment wheel, the threaded column, and the spring support are all coaxially provided with through holes for the pull rod to pass through; one end of the pull rod is fixedly connected to the movable chamber, and the other end passes through the through holes of the spring, the spring support, the threaded column, and the adjustment wheel in sequence, extending to the outside of the mounting housing and being fixedly connected to the pull block; the pull block is configured to be able to pull the movable chamber backward along the axial direction to compress the spring.

6. The tunable firing force human tissue extraction puncturing device of claim 5, wherein: The bottom wall of the spring cavity is provided with an elastic buckle, and the bottom of the movable compartment is provided with a slot that cooperates with the elastic buckle; when the movable compartment moves backward to a predetermined position, the elastic buckle engages in the slot to lock the movable compartment.

7. The tunable firing force human tissue extraction puncturing device of claim 6, wherein: Both the movable compartment and the bottom of the spring support are provided with sliders, and the inner wall of the spring cavity is provided with guide grooves that cooperate with the sliders.

8. The tunable firing force human tissue extraction puncturing device of claim 5, wherein: The rear end of the mounting housing is also provided with a safety seat, and the safety seat has a guide groove and a safety hole that are perpendicularly connected to each other; a guide plate is fixed on the pull block, and the guide plate slides through the guide groove; a safety pin is inserted into the safety hole, and the safety pin has a clearance hole for the guide plate to pass through; when the safety pin is inserted and the clearance hole is misaligned with the guide plate, the movement path of the guide plate is blocked by the safety pin.

9. The adjustable force human tissue extraction lancing device of claim 1, wherein: The lower part of the mounting housing has two finger rings for fingers to pass through, and the top of the mounting housing has a cover plate.

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