Sample stroke adjustment device, biopsy device, and sample stroke adjustment method

Abstract

The present application relates to the technical field of medical devices, and specifically discloses a sampling stroke adjusting device, a biopsy device and a sampling stroke adjusting method. The sampling stroke adjusting device comprises a base, an adjusting seat and a position locking mechanism. The adjusting seat is movably connected with the base and can move along the length direction relative to the base. The adjusting seat is provided with a first stop portion and a second stop portion along the length direction. The position locking mechanism is arranged between the adjusting seat and the base and is configured to adjust and lock the relative position between the adjusting seat and the base. In the above structure, the adjusting seat can move relative to the base. The first stop portion and the second stop portion for cooperating with the upper strings of the outer puncture needle assembly and the inner puncture needle assembly are arranged on the adjusting seat. The upper string positions of the inner puncture needle and the outer puncture needle can be adjusted. Compared with the prior art in which the first stop portion and the second stop portion are fixedly arranged, the present application has a breakthrough change.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a sampling stroke adjustment device, a biopsy device, and a sampling stroke adjustment method. Background Technology

[0002] A biopsy device is a medical instrument suitable for sampling and aspirating cells from various organs such as the liver, kidneys, lungs, prostate, breast, and thyroid. It features simple and quick operation, ease of use, and rapid sampling.

[0003] There are currently disclosed biopsy devices, such as Chinese invention patents with publication number "CN113440177A" entitled "Biopsy Device and its Firing and Unlocking Mechanism", "Biopsy Device and its Sampling Stroke Adjustment Mechanism and Winding Firing Method", and "Biopsy Device and its Winding Firing Method".

[0004] The aforementioned biopsy device has the following shortcomings:

[0005] (1) The sampling stroke has limited adjustment ranges, with only two adjustment ranges: full stroke and intermediate stroke.

[0006] (2) The principle of sampling stroke adjustment is that by adjusting the upper chord position of the external puncture needle relative to the internal puncture needle, the coverage length of the sampling section of the internal puncture needle changes.

[0007] However, regardless of whether it is in the full stroke or intermediate stroke position, the movement path of the internal puncture needle is always the full stroke. That is, in any position, the force required to wind the internal puncture needle and the impact generated during the puncture process remain unchanged.

[0008] (3) When the sampling device is set to the intermediate stroke state, such as Figure 1 As shown, the internal puncture needle winding button 62 and the external puncture needle winding button 52 are arranged in a stepped manner. At this time, the tip of the external puncture needle extends out along the length of the needle tube relative to the tip of the internal puncture needle, forming an empty tube at the tip of the external puncture needle. Under these circumstances, there is a risk of damaging the soft tissue when performing soft tissue biopsy. The pressing strokes of the internal and external puncture needle winding buttons are different, resulting in a poor user experience.

[0009] (4) The sampling stroke adjustment component used to adjust the position of the external puncture needle requires additional operating force, resulting in excessive operating force and inconvenience in use. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a sampling stroke adjustment device, a biopsy device and a sampling stroke adjustment method with improved structure, so as to overcome the defects of the prior art.

[0011] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a sampling stroke adjustment device, characterized in that it includes at least:

[0012] The base is fixedly installed;

[0013] An adjusting seat, movably connected to the base and movable relative to the base along its length, wherein the adjusting seat is provided with a first stop and a second stop at intervals along its length; and

[0014] A position locking mechanism is disposed between the adjusting seat and the base and configured to adjust and lock the relative position between the adjusting seat and the base.

[0015] In a preferred embodiment, the base is provided with a receiving cavity extending along the length direction, the adjusting seat is movably installed in the receiving cavity, and a guiding mechanism is provided between the receiving cavity and the adjusting seat.

[0016] In a preferred embodiment, the guiding mechanism includes a guide rail and a guide groove that are adapted to each other, and the guide rail and the guide groove are respectively disposed between the accommodating cavity and the adjusting seat.

[0017] In a preferred embodiment, the position locking mechanism includes at least an adjustment button, which is movably connected to the adjustment seat. The direction of movement of the adjustment button relative to the adjustment seat is perpendicular to the direction of movement of the adjustment seat relative to the base. A gear adjustment mechanism is provided between the adjustment button and the base.

[0018] In a preferred embodiment, the gear adjustment mechanism includes mutually adapted gear slots and gear teeth, the gear slots and gear teeth being respectively disposed on the inner side of the receiving cavity and the outer side of the adjustment button.

[0019] In a preferred embodiment, the device further includes a first reset elastic element disposed between the adjustment button and the adjustment seat or base.

[0020] In a preferred embodiment, the device further includes a gear position indicator mechanism disposed between the adjustment seat and the base. The gear position indicator mechanism includes a plurality of indicator slots arranged side by side and indicator components adapted to the indicator slots. The indicator components include an elastic arm and a protrusion disposed at the free end of the elastic arm that protrudes towards the indicator slot.

[0021] A biopsy device according to this embodiment includes at least:

[0022] shell;

[0023] The sampling stroke adjustment device according to any one of claims 1-7, wherein the base is fixedly installed inside the housing, and the base is provided with a first sliding cavity and a second sliding cavity at intervals along the length direction, and a first through hole is provided at the end of the first sliding cavity away from the second sliding cavity, and the first sliding cavity and the second sliding cavity are connected through the second through hole;

[0024] An external puncture needle assembly, the external puncture needle assembly including at least an external puncture needle, an external puncture needle upper winding button, a first drive spring and a first slider, the first slider being located in the first sliding cavity and movable in the first sliding cavity, the first slider being provided with a first elastic upper winding portion for adapting and connecting with the first stop portion;

[0025] An internal puncture needle assembly, comprising at least an internal puncture needle, an internal puncture needle upper winding button, a second drive spring, and a second slider. The second slider is located within a second sliding cavity and is movable within the second sliding cavity. The second slider is provided with a second elastic upper winding portion for adapting and connecting with a second stop portion.

[0026] The firing assembly is movably connected to the adjusting seat or base. The firing assembly has a first firing part and a second firing part spaced apart along its length. The first firing part is used to drive the first elastic upper string part to separate from the first stop part, and the second firing part is used to drive the second elastic upper string part to separate from the second stop part.

[0027] In a preferred embodiment, the outer casing is provided with a gear position indicator.

[0028] This embodiment provides a sampling stroke adjustment method that adjusts the position of the adjusting seat relative to the base to simultaneously change the upper chord position of the internal and external puncture needles, thereby achieving synchronous adjustment of the sampling stroke of the internal and external puncture needles.

[0029] Compared with the prior art, the sampling stroke adjustment device, biopsy device, and sampling stroke adjustment method of this embodiment have the following advantages:

[0030] (1) An adjustable seat that can move relative to the base is provided, wherein the first stop and the second stop for cooperating with the upper chord of the external puncture needle assembly and the internal puncture needle assembly are both provided on the adjustable seat, so that the upper chord position of the internal puncture needle and the external puncture needle can be adjusted, which is a breakthrough change compared with the prior art where the first stop and the second stop are fixed.

[0031] (2) After the upper string position of the internal and external puncture needles is adjusted, their upper string and firing puncture strokes are changed synchronously. Their strokes are different when they are in different positions.

[0032] (3) Since the upper positions of the internal and external puncture needles are adjusted synchronously, the positions of the needle tips of the internal and external puncture needles remain synchronized in their upper positions, which is safer than the intermediate stroke sampling method in the prior art.

[0033] (4) It can set more puncture stroke levels, has a wider range of applications, and can adapt to biopsy sampling in more application scenarios. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a biopsy device in the prior art in a wound state.

[0035] Figure 2 This is a schematic diagram of the external structure of the biopsy device in this embodiment;

[0036] Figure 3 This is a schematic diagram of the biopsy device in its exploded state according to this embodiment;

[0037] Figure 4 This is a schematic diagram of the external structure of the sampling stroke adjustment device in this embodiment;

[0038] Figure 5 This is a schematic diagram of the explosive state structure of the sampling stroke adjustment device in this embodiment;

[0039] Figure 6 This is a schematic diagram of the base structure in this embodiment;

[0040] Figure 7 for Figure 6 Another structural schematic diagram of the base shown;

[0041] Figure 8 This is a schematic diagram of the base structure of another preferred embodiment of this invention;

[0042] Figure 9 This is a schematic diagram of the structure of the adjusting seat in this embodiment;

[0043] Figure 10 for Figure 9 A schematic diagram of the bottom structure of the adjustment seat shown;

[0044] Figure 11 This is a schematic diagram of the adjustment button in this embodiment;

[0045] Figure 12 for Figure 11 A schematic diagram of the bottom structure of the adjustment button shown;

[0046] Figure 13 This is a schematic diagram of the external puncture needle assembly in this embodiment;

[0047] Figure 14 This embodiment presents a schematic diagram of the internal puncture needle assembly.

[0048] Figure 15 This is a schematic diagram of the firing assembly in this embodiment;

[0049] Figure 16 This is a schematic diagram showing the connection between the firing assembly and the adjusting base in this embodiment;

[0050] Figure 17 This is a cross-sectional view of the biopsy device in this embodiment;

[0051] Figure 18 This is a schematic diagram of the biopsy device in different winding states in this embodiment. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this invention clearer, the invention 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 and not intended to limit the invention.

[0053] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "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 invention 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 invention.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] One biopsy device in this embodiment, such as Figure 2 As shown, the device includes a puncture assembly 100 and an operating handle 200. The puncture assembly includes an inner puncture needle 61 and an outer puncture needle 51 that are coaxially coupled. The housing 10 of the operating handle 200 is provided with an adjustment button 80, a firing button 41, a firing part 42 at the tail, an outer puncture needle winding button 52, and an inner puncture needle winding button 62.

[0056] The explosion state of the biopsy device in this embodiment is as follows: Figure 3As shown, it includes an outer shell 10 consisting of a main shell 11 and a bottom shell 12, a base 20 fixedly connected to the outer shell, an adjustment seat 30, a firing assembly 40, an external puncture needle assembly 50, an internal puncture needle assembly 60, and a cannula 70.

[0057] like Figure 3 , Figure 4 As shown, the sampling stroke adjustment device of this embodiment includes: a base 20, an adjustment seat 30, and an adjustment button 80. An adjustment spring 801 is provided between the adjustment button 80 and the adjustment seat 30. The adjustment spring 801 serves as the first reset elastic element in this embodiment and is used to reset the adjustment button 80.

[0058] It should be noted that using an adjusting spring as the first reset elastic element in this embodiment is only a preferred embodiment. Other elastic structures in the prior art can also be used as the elastic reset structure of the adjusting button. In addition, placing the adjusting spring between the adjusting button and the adjusting seat is also a preferred embodiment. As an equivalent embodiment, it can also be placed between the adjusting seat and the base.

[0059] The structure of the base 20 in this embodiment is as follows: Figures 6-8 As shown, it has a receiving cavity 21 with an opening at the top, which is used to accommodate an adjusting seat 30. The adjusting seat 30 is movably connected to the base 20 and can move relative to the base along the length direction within the receiving cavity 21.

[0060] A preferred embodiment, such as Figure 6 , Figure 9 As shown, guide grooves 212 extending along the length direction are provided on both sides of the bottom of the accommodating cavity 21. Correspondingly, guide rails 31 adapted to and connected to the guide grooves 212 are provided on both sides of the adjusting seat 30. The guide rails 31 and the guide grooves 212 constitute the guiding mechanism between the base 20 and the adjusting seat 30.

[0061] It should be noted that, as an equivalent implementation of this embodiment, the guide rail can also be disposed inside the accommodating cavity, and correspondingly, the guide groove can also be disposed outside the adjusting seat.

[0062] In this embodiment, based on the above-mentioned guiding mechanism, the adjustment seat can move relative to the base. In order to realize the position adjustment and position locking between the adjustment seat and the base, a position locking mechanism is provided between the adjustment seat and the base in this embodiment.

[0063] Specifically, such as Figures 6-10 As shown, the position locking mechanism of this embodiment includes an adjustment button 80, which is movably connected to the adjustment seat 30, and the movement direction of the adjustment button 80 relative to the adjustment seat 30 is perpendicular to the movement direction of the adjustment seat 30 relative to the base 20.

[0064] Specifically, in this embodiment, the adjusting seat 30 moves along the length of the base 20, and the adjusting button 80 is located above the outer casing away from the bottom casing and moves vertically. Of course, this is a preferred embodiment; as an equivalent embodiment, the adjusting button 80 can also be located on both sides of the outer casing 10.

[0065] The bottom of the adjusting seat 30 is provided with a first stop 37 and a second stop 38 at intervals along the length direction. The first stop 37 is used to cooperate with the external puncture needle assembly 50 to realize the winding operation of the external puncture needle assembly 50; the second stop 38 is used to cooperate with the internal puncture needle assembly 60 to realize the winding operation of the internal puncture needle assembly 60.

[0066] Preferably, the front ends of the first stop portion 37 and the second stop portion 38 are provided with guide surfaces 39 to facilitate winding operations.

[0067] The structure of the adjustment button 80 in this embodiment is as follows: Figure 11 , Figure 12 As shown, it includes a button base 81, on both sides of the bottom of the button base 81, walls 82 extending downwards are provided, and the walls 82 on both sides are arranged across the two sides of the adjustment seat 30.

[0068] Accordingly, such as Figure 9 , Figure 10 As shown, the adjustment seat 30 has grooves 32 on both sides for accommodating the wall 82. The wall 82 is adapted to the grooves 32, so that the adjustment button 80 can only move along the direction of the grooves 32.

[0069] In a preferred embodiment, the bottom of the button base 81 is provided with a spring cavity 85 for accommodating the adjusting spring 801. Preferably, the bottom of the spring cavity 85 is provided with a first spring connecting part 86, and correspondingly, a second spring connecting part 33 is provided at a corresponding position on the adjusting seat 30.

[0070] In this embodiment, a gear adjustment mechanism is provided between the adjustment button 80 and the base 20. Specifically, as follows: Figure 9 , Figure 10 As shown, the outer side of the wall 82 of the adjustment button 80 has multiple upwardly extending gear teeth 83 protruding from the bottom. Correspondingly, as... Figures 6-8 As shown, the inner wall of the accommodating cavity 21 of the base 20 is provided with an adjustment groove 27 for accommodating the up and down movement of the gear tooth 83, and the top of the adjustment groove 27 is provided with a plurality of gear grooves 28 for adapting and connecting with the gear tooth 83.

[0071] The number of gear positions can be set according to the number of gear slots 28 along the length of the base. Of course, as an equivalent implementation, the gear teeth can be set inside the receiving cavity, and the gear slots can be set outside the adjustment button.

[0072] In this embodiment, based on the above-mentioned gear adjustment mechanism, the method and principle for adjusting the gear are as follows:

[0073] Under normal conditions, based on the action of the adjusting spring 801, the gear tooth 83 is driven to engage with the gear groove 28, the position of the adjusting seat 30 is fixed relative to the base 20, and it is in a locked state.

[0074] When gear adjustment is required, press the adjustment button 80 to disengage the gear teeth 83 from the gear slot 28, and compress the adjustment spring 801. In this state, the lock between the adjustment seat and the base is released. Based on the cooperation between the wall 82 and the slot 32, pushing the adjustment button relative to the base will move the adjustment seat relative to the base.

[0075] When the desired gear is adjusted, the pressure applied to the adjustment button is released. Under the restoring force of the adjustment spring 801, the gear tooth 83 and the gear groove 28 re-engage, and a position lock is formed between the adjustment seat and the base.

[0076] As a preferred embodiment, such as Figure 2 As shown, a gear position indicator 13 is provided on the exterior of the housing 10 near the adjustment button 80 to indicate the current gear position. It should be noted that the gear position indicator 13 can adopt any existing conventional technology, such as numbers, scales, specific marks, digital displays, etc.

[0077] As a preferred embodiment, in order to provide users with a more intuitive experience when adjusting the gear, a gear indicator mechanism is also provided between the adjustment seat 30 and the base 20.

[0078] Specifically, in this embodiment, as Figure 9 As shown, several indicator slots 34 are arranged side by side on both sides of the adjustment seat 30, corresponding to, as Figures 6-8 As shown, the base 20 is provided with a prompting component adapted to the prompting slot 34. Preferably, the prompting component includes an elastic arm 210 and a protrusion 211 provided at the free end of the elastic arm protruding towards the prompting slot 34.

[0079] In this embodiment, during gear adjustment, when the adjustment seat is pushed, the protrusion 211 sequentially moves from its current indication slot 34 into the adjacent indication slot 34. During this process, based on the deformation of the elastic arm 210, the user will feel the damping change caused by this elastic deformation. Furthermore, when the protrusion 211 enters the indication slot 34, it will produce a sound due to the impact, thereby indicating to the user that the corresponding gear has been adjusted. At this time, after releasing the adjustment button, the gear teeth 83 and the gear slot 28 are in a completely corresponding state and will accurately engage.

[0080] Based on the gear position indication mechanism of this embodiment, the user has a better experience in judging the gear position through damping changes and sound. At the same time, it also ensures the accuracy of the corresponding position of the gear position tooth 83 and the gear position groove 28.

[0081] The base 20 in this embodiment, such as Figures 6-8 As shown, below the receiving cavity 21, a first sliding cavity 22 and a second sliding cavity 23 are provided at intervals along the length direction, and the first sliding cavity 22 and the second sliding cavity 23 are respectively connected to the receiving cavity 21. A first through hole 24 is provided at the end of the first sliding cavity 22 away from the second sliding cavity, and the first sliding cavity 22 and the second sliding cavity 23 are connected through a second through hole 25. Sliding grooves 26 are respectively provided on both sides of the first sliding cavity 22 and the second sliding cavity 23.

[0082] Preferably, in this embodiment, the base 20 is assembled from a symmetrical first base 201 and a second base 202. A plurality of positioning connection structures 29 are provided between the first base 201 and the second base 202.

[0083] The external puncture needle assembly 50 in this embodiment, such as Figure 13 As shown, it includes an external puncture needle 51, an external puncture needle winding button 52, a first drive spring 56, and a first slider 53. The first slider 53 has first sliding portions 55 on both sides that are adapted to the slide groove 26, and the external puncture needle winding button 52 is connected to one of the first sliding portions 55.

[0084] In this embodiment, the first slider 53 is located within the first sliding cavity 22 and can move within the first sliding cavity 22. A first elastic upper winding portion 54 is provided above the first slider 53 for adapting and connecting with the first stop portion 37. During the winding process, pressing the external puncture needle winding button 52 moves the first slider 53 backward until the first elastic upper winding portion 54 deforms and abuts against the first stop portion 37. After winding, the first drive spring 56 is in a compressed state. After releasing the winding state, the external puncture needle 51 is punctured based on the restoring force of the first drive spring 56.

[0085] The internal puncture needle assembly 60 in this embodiment, such as Figure 14 As shown, it includes an internal puncture needle 61, an internal puncture needle winding button 62, a second drive spring 66, and a second slider 63. The second slider 63 has second sliding portions 65 on both sides that are adapted to the slide groove 26, and the internal puncture needle winding button 62 is connected to one of the second sliding portions 65.

[0086] In this embodiment, the second slider 63 is located within the second sliding cavity 23 and can move within the second sliding cavity 23. A second elastic upper winding portion 64 is provided above the second slider 63 for fitting and connecting with the second stop portion 38. During the winding process, pressing the inner puncture needle winding button 62 moves the second slider 63 backward until the second elastic upper winding portion 64 deforms and abuts against the second stop portion 38. After winding, the second drive spring 66 is in a compressed state. After releasing the winding state, the inner puncture needle 61 is punctured based on the restoring force of the second drive spring 66.

[0087] The firing component 40 in this embodiment, such as Figures 15-17 As shown, it is movably connected to the adjustment base 30. The firing assembly 40 of this embodiment includes a firing housing 43 covering the adjustment base 30 and a guide portion 44 located within the guide cavity 35 of the adjustment base 30. The firing housing 43 includes a firing button 41 at the front and a firing portion 42 at the rear. During operation, both the firing button 41 and the firing portion 42 can drive the firing assembly 40 to move. Alternatively, only one operating part for operating the firing assembly may be provided.

[0088] In this embodiment, the bottom of the guide portion 44 of the firing assembly 40 is provided with a first firing portion 45 and a second firing portion 46 spaced apart along the length direction. When both the external puncture needle assembly 50 and the internal puncture needle assembly 60 are in the wound state, the first firing portion 45 is used to drive the first elastic wound portion to separate from the first stop portion, and the second firing portion is used to drive the second elastic wound portion to separate from the second stop portion.

[0089] In this embodiment, a guide rod 47 is provided at the front end of the guide part 44, and a second return spring 49 is sleeved on the guide rod 47. The guide rod 47 has a deformable limiting end 48 for its degree of freedom, and the limiting end 48 passes through the opening 36 at the front end of the adjusting seat. During the process of pushing the firing assembly, the second return spring is compressed. After the force applied to the firing assembly is released, the firing assembly returns to its original position under the elastic restoring force of the second return spring.

[0090] It should be noted that the structure, puncture sampling principle, and firing principle of the aforementioned internal and external puncture needle assemblies are the same as those of the prior art cited in this application, and will not be repeated here.

[0091] The special feature of this embodiment is that it provides a sampling stroke adjustment method that is different from the prior art. By adjusting the position of the adjustment seat relative to the base, the upper chord position of the internal puncture needle and the external puncture needle is changed simultaneously, thereby realizing the synchronous adjustment of the sampling stroke of the internal puncture needle and the external puncture needle.

[0092] like Figure 18 As shown, state 'a' represents the initial state, and states 'be' represent the winding states in four different gear positions. Because the winding positions of the internal and external puncture needles are adjusted synchronously, the winding buttons for both the internal and external puncture needles are in the same position at each gear position. This is consistent with existing technology. Figure 1 Compared to the intermediate stroke sampling shown, this method offers higher security, a better user experience, and completely changes the way stroke adjustment is performed in existing technologies.

[0093] In summary, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sampling stroke adjustment device, characterized in that, At least including: A base, the base being fixedly disposed, the base being provided with a receiving cavity extending along the length direction; An adjusting seat is movably connected to the base and can move relative to the base along the length direction. The adjusting seat is movably installed in the receiving cavity. A guide mechanism is provided between the receiving cavity and the adjusting seat. The adjusting seat is provided with a first stop and a second stop at intervals along the length direction. as well as A position locking mechanism is disposed between the adjusting seat and the base and configured to adjust and lock the relative position between the adjusting seat and the base; The position locking mechanism includes at least an adjustment button, which is movably connected to the adjustment seat. The direction of movement of the adjustment button relative to the adjustment seat is perpendicular to the direction of movement of the adjustment seat relative to the base. A gear adjustment mechanism is provided between the adjustment button and the base.

2. The sampling stroke adjustment device according to claim 1, characterized in that, The guiding mechanism includes mutually adapted guide rails and guide grooves, which are respectively disposed between the accommodating cavity and the adjusting seat.

3. The sampling stroke adjustment device according to claim 1, characterized in that, The gear adjustment mechanism includes mutually compatible gear slots and gear teeth, which are respectively located inside the accommodating cavity and outside the adjustment button.

4. The sampling stroke adjustment device according to claim 3, characterized in that, It also includes a first reset elastic element, which is disposed between the adjustment button and the adjustment seat or base.

5. The sampling stroke adjustment device according to any one of claims 1-4, characterized in that, It also includes a gear position indicator mechanism disposed between the adjustment seat and the base. The gear position indicator mechanism includes a plurality of indicator slots arranged side by side and indicator components adapted to the indicator slots. The indicator components include an elastic arm and a protrusion disposed at the free end of the elastic arm that protrudes towards the indicator slot.

6. A biopsy device, characterized in that, At least including: shell; The sampling stroke adjustment device according to any one of claims 1-5, wherein the base is fixedly installed inside the housing, and the base is provided with a first sliding cavity and a second sliding cavity at intervals along the length direction, and a first through hole is provided at the end of the first sliding cavity away from the second sliding cavity, and the first sliding cavity and the second sliding cavity are connected through the second through hole; An external puncture needle assembly, the external puncture needle assembly including at least an external puncture needle, an external puncture needle upper winding button, a first drive spring and a first slider, the first slider being located in the first sliding cavity and movable in the first sliding cavity, the first slider being provided with a first elastic upper winding portion for adapting and connecting with the first stop portion; An internal puncture needle assembly, the internal puncture needle assembly including at least an internal puncture needle, an internal puncture needle upper string button, a second drive spring and a second slider, the second slider being located in the second sliding cavity and movable in the second sliding cavity, the second slider being provided with a second elastic upper string for adapting and connecting with the second stop portion; as well as The firing assembly is movably connected to the adjusting seat or base. The firing assembly has a first firing part and a second firing part spaced apart along its length. The first firing part is used to drive the first elastic upper string part to separate from the first stop part, and the second firing part is used to drive the second elastic upper string part to separate from the second stop part.

7. The biopsy device according to claim 6, characterized in that, The outer casing is equipped with gear position markings.

8. A method for adjusting the sampling stroke of the biopsy device according to claim 6 or 7, characterized in that, By adjusting the position of the adjusting seat relative to the base, the upper chord position of the internal and external puncture needles is changed synchronously, thereby achieving synchronous adjustment of the sampling stroke of the internal and external puncture needles.

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