Endoscope biopsy needle puncture locking structure and biopsy needle

Abstract

The application discloses an endoscope biopsy needle puncture locking structure and a biopsy needle, and relates to the technical field of medical devices. The endoscope biopsy needle puncture locking structure is installed on a core rod of the biopsy needle and comprises a moving ring which is provided with a hole one penetratingly arranged in the axial direction, and the moving ring is axially slidably sleeved on the core rod through the hole one. The endoscope biopsy needle puncture locking structure provided by the application realizes convenient operation of single-hand sliding adjustment of puncture depth and rotation locking through cooperation of an L-shaped sliding channel and a guide column, and significantly improves intraoperative adjustment efficiency; mechanical stop of rigid meshing of a rack and limiting convex ridges is adopted to ensure anti-vibration and anti-tension after locking, and to provide double feedback of click feeling and LOCK identification, thereby avoiding misoperation; the structure is composed of only two core parts, is simple and ingenious, and has controllable cost, and effectively solves the clinical pain points of complex operation, unreliable locking and high cost in the prior art.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a puncture locking structure for an endoscopic biopsy needle and a biopsy needle. Background Technology

[0002] Endoscopic ultrasound-guided fine-needle aspiration biopsy is an important technique for diagnosing diseases of the digestive system and surrounding tissues, particularly suitable for obtaining tissue samples from lesions of the pancreas, mediastinum, and extramural areas of the digestive tract. A disposable ultrasound aspiration biopsy needle is the core instrument for this technique, typically consisting of a needle tube, a core, an outer sheath, and an operating handle. During the clinical procedure, the operator inserts the biopsy needle into the body through the working channel of the endoscopic ultrasound system. Under real-time ultrasound guidance, the needle is inserted into the target lesion, and negative pressure aspiration is used to obtain cell or tissue samples for pathological examination.

[0003] During biopsy needle operation, precise control and maintenance of puncture depth are key factors in ensuring biopsy success rates. The operator adjusts the needle extension length by sliding a locking mechanism located below the handle, thus adapting to lesions of different depths and sizes. Specifically, by changing the position of the locking mechanism on the mandrel, the depth of tissue penetration can be limited. This locking mechanism can be firmly fixed in a preset position on the mandrel to ensure the stability and accuracy of the puncture process. However, current biopsy needle locking mechanisms mainly suffer from the following technical problems: (1) Inconvenient operation: Some locking structures use threaded locking. When it is necessary to adjust or fix the needle position, the operator needs to rotate it multiple times with both hands, which is complicated. In the narrow endoscopic operating space, it is especially difficult to operate with one hand, which not only prolongs the operation time but also increases the complexity of the operation.

[0004] (2) Unreliable locking: Some locking structures that use snap-on or friction-based principles are prone to loosening or slippage when subjected to intraoperative vibration or axial tension, resulting in needle displacement. This defect not only affects the accuracy of puncture, but may also cause damage to the target tissue or lead to puncture failure in severe cases.

[0005] (3) Complex structure and high cost: Some complex mechanical structures designed to achieve the locking effect increase the number of parts and assembly difficulty of the product, which is not conducive to cost control and large-scale production of disposable medical devices under the background of centralized procurement.

[0006] Therefore, developing a single-use ultrasonic aspiration biopsy needle locking structure that is simple in structure, easy to operate, can be locked and unlocked with one hand, and has a clear and reliable locking state has become an urgent technical problem to be solved in this field.

[0007] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0008] To address the aforementioned technical problems, embodiments of the present invention provide an endoscopic biopsy needle puncture locking structure and a biopsy needle, thereby resolving the issues raised in the background section.

[0009] This invention provides the following technical solution: an endoscopic biopsy needle puncture locking structure, mounted on the core of the biopsy needle; comprising: A movable ring has a hole through it along the axial direction, and the movable ring is axially slidably sleeved on the core rod through the hole. The moving ring has an L-shaped slide rail on its ring wall. The L-shaped slide rail includes a vertical section extending along the axial direction and a horizontal section that connects to the vertical section and extends along the circumference. Limiting protrusion one is fixed on the side of the arc segment closer to the vertical segment, and limiting protrusion two is fixed on the side of the arc segment away from the vertical segment. A locking ring has a hole two extending through it along the axial direction. The locking ring can be rotatably sleeved on the outside of the moving ring through the hole two. A guide post is fixed on the inner wall of the locking ring; the guide post is slidably limited in the L-shaped slide rail and is used to guide the locking ring to rotate circumferentially relative to the moving ring. Among them, a rack extending circumferentially is fixedly installed on the inner wall of the locking ring; multiple racks are spaced apart axially on the core rod. When the moving ring and locking ring are locked, rack one engages with one of rack two, and the guide post is located on the side of the limiting protrusion two away from the limiting protrusion one.

[0010] Preferably, the horizontal segment is shaped like an arc, a wave, a spiral, or an L; preferably, the horizontal segment is shaped like an arc.

[0011] Preferably, the size and shape of the hole are matched with the size and shape of the core rod body to restrict the moving ring to move only along the core rod axis and not rotate.

[0012] Preferably, a limiting block is axially provided on the inner wall of hole one, and limiting grooves that slide in conjunction with the limiting block are distributed axially on the core rod.

[0013] Preferably, the outer cylindrical surface of the moving ring is provided with a circumferential groove, and the inner cylindrical surface of the locking ring is provided with a circumferential protrusion that mates with the circumferential groove; the circumferential groove and the circumferential protrusion mesh with each other to limit the axial relative displacement between the moving ring and the locking ring.

[0014] Preferably, the outer surface of the locking ring is provided with LOCK and UNLOCK markings at positions corresponding to the locked and unlocked states, respectively.

[0015] A biopsy needle having a biopsy needle puncture locking structure as described in any of the above claims.

[0016] A method for adjusting and locking the puncture depth using the biopsy needle of claim 6 with one hand, comprising the following steps: Step 1: With the device unlocked, the operator holds the locking ring with one hand and slides it along the axis of the core rod to adjust the puncture depth; Step 2: After sliding to the target position, the operator rotates the locking ring with one hand, causing the locking ring to rotate relative to the moving ring, which in turn causes the rack on the locking ring to mesh with the rack on the core rod; Step 3: During the rotation, the operator senses the change in damping and the clicking sound as the guide post passes the limiting protrusion to confirm that it is locked in place. Step 4: The operator visually confirms the locking status by observing the LOCK mark on the outer surface of the locking ring.

[0017] Preferably, the method further includes: in the locked state, the operator rotates the locking ring in the opposite direction to disengage the rack, confirms the unlocked state by the UNLOCK mark, and then adjusts the puncture depth again.

[0018] The endoscopic biopsy needle puncture locking structure and biopsy needle provided in this embodiment of the invention have the following beneficial effects: (1) Through the L-shaped slide and guide post structure set on the locking ring and the moving ring, the operator only needs to slide and adjust to the appropriate position in the unlocked state, and then lock by simply rotating the locking ring clockwise, and unlock by rotating it in the opposite direction. The whole process does not require the use of both hands to rotate, and can be easily operated with one hand in the narrow endoscopic operating space, which significantly shortens the operation time and reduces the complexity of operation.

[0019] (2) Regarding the locking mechanism, the meshing of rack one and rack two is adopted as the main locking method, and at the same time, the limiting convex 2 limits the guide post to form a double locking structure. Compared with the traditional snap-on or friction structure, this design can provide higher connection strength, effectively resist intraoperative vibration and axial tension, and prevent needle displacement.

[0020] When the locking mechanism slides to the locked position, the guide post will make a clear click sound and be accompanied by a damping feel as it passes the limit protrusion. Combined with the visual confirmation provided by the LOCK / UNLOCK markings, this creates a multi-sensory cues that allow the operator to clearly understand the locking status and avoid misoperation.

[0021] (3) The cooperation between the limiting block in the inner cavity of the moving ring and the limiting groove of the core rod ensures the smooth sliding of the moving ring and prevents its relative rotation, providing a basis for precise locking. The circumferential groove and convex strip meshing design between the moving ring and the locking ring allows the two to rotate relative to each other and prevents accidental axial separation, providing reliable redundancy protection.

[0022] (4) The locking structure is mainly composed of two parts: a moving ring and a locking ring. It achieves complex functions through the clever use of sliding grooves, guide posts and racks, thus avoiding complex mechanical structures. This not only reduces the number of parts and the difficulty of assembly, but also makes it more in line with the requirements of cost control and large-scale production of disposable medical devices under the background of centralized procurement. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention installed on a biopsy needle at an angle of one; Figure 2 This is a schematic diagram of the structure of the present invention installed on the biopsy needle at angle two; Figure 3 For the present invention Figure 1 Schematic diagram of the cross-sectional structure along the AA direction; Figure 4 For the present invention Figure 2 A magnified view of part B in the image; Figure 5 This is a schematic diagram of the structure of the moving ring at angle one in this invention; Figure 6 This is a schematic diagram of the structure of the moving ring at angle two in this invention; Figure 7 This is a schematic diagram of the locking ring structure in this invention; Figure 8 This is a schematic diagram of the structure in which the moving ring and the locking ring are in the unlocked state in this invention; Figure 9 This is a schematic diagram of the structure in which the moving ring and the locking ring are in a locked state in this invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] See Figures 1-9 .

[0026] To address the problems mentioned in the background section, this invention provides an endoscopic biopsy needle puncture locking structure and a biopsy needle to solve the aforementioned technical problems. The technical solution is as follows: An endoscopic biopsy needle puncture locking structure 300 is mounted on the core 200 of the biopsy needle; comprising: The movable ring 320 has a hole 326 extending through it along the axial direction. The movable ring 320 is axially slidably sleeved on the core rod 200 through the hole 326. An L-shaped slide 323 is provided on the ring wall of the movable ring 320. The L-shaped slide 323 includes a vertical section 323-1 extending along the axial direction and a horizontal section 323-2 that communicates with the vertical section 323-1 and extends along the circumferential direction. A limiting protrusion 324 is fixed on the side of the arc segment 323-2 closest to the vertical segment 323-1, and a limiting protrusion 325 is fixed on the side of the arc segment 323-2 away from the vertical segment 323-1. The locking ring 310 has a hole 311 extending through it along the axial direction. The locking ring 310 is rotatably sleeved on the outside of the moving ring 320 through the hole 311. A guide post 312 is fixed on the inner wall of the locking ring 310; the guide post 312 is slidably limited in the L-shaped slide rail 323 and is used to guide the locking ring 310 to rotate circumferentially relative to the moving ring 320. Among them, a rack 314 extending circumferentially is fixedly provided on the inner wall of the locking ring 310; multiple racks 210 are provided axially at intervals on the core rod 200. When the moving ring 320 and the locking ring 310 are locked, rack 1 314 engages with one of racks 210, and guide post 312 is located on the side of limiting protrusion 2 325 away from limiting protrusion 1 324.

[0027] In this embodiment, the size and shape of the hole 326 are matched with the size and shape of the core rod 200, which is used to restrict the moving ring 320 to move only along the axial direction of the core rod 200 and not to rotate.

[0028] In this embodiment, a limiting block 322 is axially provided on the inner wall of hole 326, and limiting grooves that slide in conjunction with the limiting block 322 are distributed axially on the core rod 200. This structure ensures that the moving ring 320 can only slide along the axial direction of the core rod 200, providing a stable foundation for subsequent locking operations.

[0029] In this embodiment, a circumferential groove 327 is provided on the outer cylindrical surface of the moving ring 320, and a circumferential protrusion 313 that cooperates with the circumferential groove 327 is provided on the inner cylindrical surface of the locking ring 310; the circumferential groove 327 and the circumferential protrusion 313 mesh with each other to limit the axial relative displacement between the moving ring 320 and the locking ring 310.

[0030] In this embodiment, the outer surface of the locking ring 310 is provided with LOCK and UNLOCK markings at positions corresponding to the locked and unlocked states, respectively. The LOCK and UNLOCK markings are used to provide the operator with clear and intuitive visual status prompts.

[0031] When adjusting the puncture depth, the operator can quickly confirm whether it is in an unlocked and adjustable state or a locked and fixed state by observing the indicator, avoiding operational errors due to misjudgment and improving the convenience and safety of clinical use.

[0032] In this embodiment, a biopsy needle is equipped with a biopsy needle puncture locking structure 300 as described above.

[0033] In this embodiment, a method for adjusting and locking the puncture depth by operating the biopsy needle with one hand includes the following steps: Step 1: With the device unlocked, the operator holds the locking ring with one hand and slides it along the axis of the core rod to adjust the puncture depth; Step 2: After sliding to the target position, the operator rotates the locking ring with one hand, causing the locking ring to rotate relative to the moving ring, which in turn causes the rack on the locking ring to mesh with the rack on the core rod; Step 3: During the rotation, the operator senses the change in damping and the clicking sound as the guide post passes the limiting protrusion to confirm that it is locked in place. Step 4: The operator visually confirms the locking status by observing the LOCK mark on the outer surface of the locking ring.

[0034] It also includes: in the locked state, the operator rotates the locking ring in the opposite direction to disengage the rack, and confirms the unlocked state through the UNLOCK mark, and then adjusts the puncture depth again.

[0035] I. The installation method of the endoscopic biopsy needle puncture locking structure provided by the embodiments of the present invention is as follows: The locking ring 310 can be fitted onto the upper end of the movable ring 320. The guide post 312 in the locking ring 310 is inserted along the L-shaped slide rail 323 in the movable ring 320. The movable ring 320 is provided with a limiting protrusion 324, which serves as an initial limit when the guide post 312 is screwed into the L-shaped slide rail 323, and at the same time prevents the guide post 312 from being over-screwed and disengaged from the working area in the unlocked state.

[0036] The movable ring 320 is also provided with a limiting protrusion 325, which can be locked when the guide post 312 is rotated and locked to prevent it from loosening and shifting due to vibration and force during puncture. At the same time, when the guide post 312 passes the limiting protrusion 325, it will make a clicking sound and feel to indicate that the locking has been completed.

[0037] The circumferential groove 327 on the outer cylindrical surface of the moving ring 320 and the circumferential protrusion 313 on the inner cylindrical surface of the locking ring 310 can mesh with each other after they are installed in place. This allows them to rotate relative to each other and prevents them from accidentally separating axially, thus serving as a redundant design feature.

[0038] The movable ring 320 is fitted onto the core rod 200 through its hole 326. The limiting block 322 inside the movable ring 320 engages with the limiting groove on the core rod 200, ensuring that the movable ring 320 can only move axially and cannot rotate. The engagement between the movable ring 320 and the core rod 200 has a foolproof design to prevent rotational failure caused by incorrect installation.

[0039] II. The operation method of using the endoscopic biopsy needle puncture locking structure provided in this embodiment of the invention is as follows: like Figure 8 In the unlocked state, rack 314 in locking ring 310 is separated from rack 210 on core rod 200 at a certain angle. Guide post 312 is located in the arc section 323-2 of L-shaped slide 323 and is blocked from rotating by limiting protrusion 324, creating a sense of sticking to indicate to the operator that it is in the unlocked state. The word "UNLOCK" is also printed on the outer surface of locking ring 310 to remind the operator that it is unlocked. When the operator pinches locking ring 310 and slides it up and down, guide post 312 is engaged in the arc section 323-2 of L-shaped slide 323. Locking ring 310 and moving ring 320, as a single structure, can move freely axially on core rod 200 for adjustment.

[0040] like Figure 4 In the locked state, when the lock ring 310 is pinched and moved up and down to select a suitable distance in the unlocked state, the lock ring 310 is rotated clockwise, and the guide post 312 moves within the arc segment 323-2. When the guide post 312 passes the second limiting protrusion 325, there is a noticeable damping sensation to remind the operator that it is about to lock; when a click is heard and a noticeable stop is felt, the guide post 312 has passed the second limiting protrusion 325. At this time, the rack 1 314 and the rack 2 210 at the corresponding position on the core rod 200 are engaged and locked. At the same time, the word "LOCK" is printed on the outer surface of the lock ring 310 to remind the operator that the lock ring 310 and the moving ring 320 are locked on the core rod 200. At this time, controlling the sliding handle 100 to move down can simultaneously drive the needle tube 400, thereby realizing the adjustment of the extension length of the needle tube 400.

[0041] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of components or the interaction between components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] It is understood that those skilled in the art can make equivalent substitutions or modifications to the technical solutions and concepts of this invention, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. A puncture locking structure for an endoscopic biopsy needle, mounted on the core of the biopsy needle; characterized in that, include: A movable ring has a hole through it along the axial direction, and the movable ring is axially slidably sleeved on the core rod through the hole. The moving ring has an L-shaped slide rail on its ring wall. The L-shaped slide rail includes a vertical section extending along the axial direction and a horizontal section that connects to the vertical section and extends along the circumference. Limiting protrusion one is fixed on the side of the arc segment closer to the vertical segment, and limiting protrusion two is fixed on the side of the arc segment away from the vertical segment. A locking ring has a hole two extending through it along the axial direction. The locking ring can be rotatably sleeved on the outside of the moving ring through the hole two. A guide post is fixed on the inner wall of the locking ring; the guide post is slidably limited in the L-shaped slide rail and is used to guide the locking ring to rotate circumferentially relative to the moving ring. Among them, a rack extending circumferentially is fixedly installed on the inner wall of the locking ring; multiple racks are spaced apart axially on the core rod. When the moving ring and locking ring are locked, rack one engages with one of rack two, and the guide post is located on the side of the limiting protrusion two away from the limiting protrusion one.

2. The endoscopic biopsy needle puncture locking structure according to claim 1, characterized in that, The horizontal segment is shaped like an arc, wave, spiral, or L.

3. The endoscopic biopsy needle puncture locking structure according to claim 1, characterized in that, The size and shape of the hole are matched with the size and shape of the core rod, which is used to restrict the moving ring to move only along the axial direction of the core rod and not to rotate.

4. The endoscopic biopsy needle puncture locking structure according to claim 1, characterized in that, A limiting block is axially provided on the inner wall of hole one, and limiting grooves that slide in conjunction with the limiting block are distributed axially on the core rod.

5. The endoscopic biopsy needle puncture locking structure according to claim 1, characterized in that, The outer cylindrical surface of the moving ring is provided with a circumferential groove, and the inner cylindrical surface of the locking ring is provided with a circumferential protrusion that mates with the circumferential groove; the circumferential groove and the circumferential protrusion mesh with each other to limit the axial relative displacement between the moving ring and the locking ring.

6. The endoscopic biopsy needle puncture locking structure according to claim 1, characterized in that, The outer surface of the locking ring is marked with LOCK and UNLOCK symbols at positions corresponding to the locked and unlocked states, respectively.

7. A biopsy needle, characterized in that, It is equipped with a biopsy needle puncture locking structure as described in any one of claims 1-6.

8. A method for adjusting and locking the puncture depth using a biopsy needle as described in claim 6 with one hand, characterized in that, Includes the following steps: Step 1: With the device unlocked, the operator holds the locking ring with one hand and slides it along the axis of the core rod to adjust the puncture depth; Step 2: After sliding to the target position, the operator rotates the locking ring with one hand, causing the locking ring to rotate relative to the moving ring, which in turn causes the rack on the locking ring to mesh with the rack on the core rod; Step 3: During the rotation, the operator senses the change in damping and the clicking sound as the guide post passes the limiting protrusion to confirm that it is locked in place. Step 4: The operator visually confirms the locking status by observing the LOCK mark on the outer surface of the locking ring.

9. The method for adjusting and locking the puncture depth of the biopsy needle according to claim 8, characterized in that, Also includes: With the device locked, the operator rotates the locking ring in the opposite direction to disengage the rack and pinion, then confirms the unlocked state by checking the UNLOCK indicator before adjusting the puncture depth again.

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