Two-gear excitation integrated biopsy needle

Abstract

The two-gear excitation integrated biopsy needle comprises a device shell, a sampling assembly arranged on the surface of the device shell, a two-gear limiting assembly for shrinking the sampling assembly and an excitation assembly allowing an operator to control excitation of the sampling assembly. A matching structure of the linear track and the sliding block is arranged between the biopsy outer needle and the biopsy inner needle, under the action of the trigger button, the sliding block slides along the linear track and drives the biopsy outer needle to move synchronously, and the problem of jamming caused by eccentric stress of a traditional spring and a needle body is solved; meanwhile, the driving spring is coaxially arranged on the limiting shaft, the internal space layout of the instrument is effectively utilized, and structural redundancy is reduced; in addition, the height difference design of the clamping blocks on the outer needle connecting piece and the inner needle connecting piece enables sequential excitation of two gears of the inner biopsy outer needle to be achieved through single key operation, step-by-step operation is not needed, the stability and reliability of operation of the biopsy needle are improved, and the operation efficiency and clinical use convenience are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a two-speed excitation integrated biopsy needle. Background Art

[0002] Existing two-stage biopsy needles typically employ a step-by-step activation mechanism, relying on independent control of the inner and outer biopsy needles by external operating components. This mechanism involves pressing a handle to pre-load the outer biopsy needle, then switching the activation switch to release the outer biopsy needle for the initial puncture. To collect a sample, an independent button or knob must be pressed again to activate the inner biopsy needle, leveraging the sequential movement of the inner and outer biopsy needles to achieve tissue cutting and sample capture. This type of structure often utilizes a split spring drive system, with the activation of the outer and inner biopsy needles performed by separate spring assemblies. While this mechanism achieves basic functionality, the operation is cumbersome and mechanical linkage gaps exist. Relying on the operator to trigger the activation step by step can easily lead to timing errors.

[0003] However, the existing two-speed biopsy needles have exposed significant defects in actual use: First, the step-by-step excitation design requires multiple manual switching of operating components, which not only reduces sampling efficiency, but also easily causes incorrect excitation sequence due to accidental touch, resulting in damage to sample integrity. At the same time, there is a spatial offset between the axial force direction of the driving spring and the motion trajectory of the needle body. The inner biopsy outer needle is easily subjected to radial bending deformation under the action of eccentric loads during high-speed excitation, causing abnormal friction between the needle tube and the guide structure and even movement jamming, which in severe cases causes excitation failure. In addition, the split spring layout increases the size of the instrument, which is not conducive to precise control under narrow surgical fields. In response to the above problems, there is an urgent need for an integrated excitation mechanism and motion guide solution that simplifies the operating process while ensuring the coaxiality and smoothness of the axial movement of the inner biopsy outer needle. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides the following technical solutions:

[0005] The two-stage excitation integrated biopsy needle is characterized by comprising:

[0006] device housing;

[0007] A sampling assembly comprising an outer biopsy needle and an inner biopsy needle disposed inside the outer biopsy needle;

[0008] A two-stage limit assembly includes a snap-fit connection portion provided on the outer biopsy needle and the inner biopsy needle, a movable button provided on the surface of the device housing and connected to the snap-fit connection portion, and a spring limiter provided inside the device housing and capable of limiting the linear movement of the snap-fit connection portion within the device housing. The snap-fit connection portion is located inside the device housing and the spring limiter portion is capable of providing an elastic force for the snap-fit connection portion to move in one direction.

[0009] An activation assembly includes a dual-speed clamping joint provided inside the device housing, an elastic member connecting the device housing and the dual-speed clamping joint, and an activation button provided on the surface of the device housing, wherein the dual-speed clamping joint and the surface of the clamping connection portion are provided with mutually adapted clamping structures, and one end of the activation button extending into the interior of the device housing contacts the dual-speed clamping joint;

[0010] After the excitation button drives the double-speed clamping joint to move, the double-speed clamping joint is no longer engaged with the clamping connection part. At this time, the inner biopsy needle and the outer biopsy needle are driven to move in sequence by the clamping connection part.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the snap-on connection portion includes an outer needle connector provided at the end of the outer biopsy needle, and an inner needle connector provided at the end of the inner biopsy needle. The outer needle connector and the inner needle connector are both located on the surface of the spring limiting portion. A linear track is provided inside the device housing, and the surfaces of the outer needle connector and the inner needle connector are both provided with sliders adapted to the linear track.

[0013] Furthermore, the surface of the device housing is provided with an active opening adapted to the active button, and the number of the active buttons is two, and the two active buttons are respectively connected to the outer needle connector and the inner needle connector.

[0014] Furthermore, the number of the card slots provided on the surface of the double-speed card connector is greater than or equal to two, and an inclined surface is provided at the position where the card block is opposite to the card slot so that the card block can slide horizontally into the card slot.

[0015] Furthermore, the number of the double-speed card connectors is at least two, and at least two double-speed card connectors are respectively connected to the outer needle connector and the inner needle connector through a card connection structure. A T-shaped pressing piece is provided at one end of the excitation button close to the double-speed card connector, and the surface of the T-shaped pressing piece away from the excitation button is in contact with the two double-speed card connectors respectively.

[0016] Furthermore, the spring limiting portion includes a limiting shaft arranged inside the device housing, and a driving spring arranged on the surface of the limiting shaft. The outer needle connector and the inner needle connector are both connected to the limiting shaft. The surfaces of the outer needle connector and the inner needle connector are both provided with movable holes that are adapted to the outside of the limiting shaft. The spring is arranged between the card needle connector and the device housing.

[0017] Furthermore, the number of the driving springs is at least two, a hollow groove adapted to the driving spring is provided inside the limiting shaft, and there is at least one driving spring inside and outside the limiting shaft respectively, a limiting block capable of contacting the driving spring is provided in the movable hole provided on the surface of the outer needle connector, and a sliding groove adapted to the limiting block is provided on the surface of the limiting shaft.

[0018] Furthermore, the clamping structure includes a clamping block provided on the outer needle connector and the inner needle connector, and a clamping slot provided on the surface of the double-speed clamping joint and adapted to the clamping block. The number of the clamping slots is greater than or equal to two, and the number of the clamping blocks is greater than or equal to one.

[0019] Furthermore, the overall height of the card block on the surface of the inner needle connector and the card groove provided on the surface of the double-speed card joint in contact with the inner needle connector is smaller than the overall height of the card block on the surface of the outer needle connector and the card groove provided on the surface of the double-speed card joint in contact with the outer needle connector, and the height of the end of the T-shaped pressing piece close to the outer needle connector is higher than the height of the end close to the inner needle connector.

[0020] Furthermore, a limiting column is provided inside the device shell, and the surfaces of the T-shaped pressing piece and the double-speed clamp joint are provided with openings adapted to the limiting column, and the T-shaped pressing piece and the double-speed clamp joint can perform linear motion under the action of the limiting column.

[0021] Beneficial effects

[0022] Compared with the prior art, the present invention sets a matching structure of a linear track and a slider between the outer biopsy needle and the inner biopsy needle. Under the action of the trigger button, the slider slides along the linear track and drives the inner biopsy outer needle to move synchronously, eliminating the jamming problem caused by the eccentric force of the traditional spring and the needle body; at the same time, by coaxially arranging the driving spring on the limit axis, the internal space layout of the instrument is effectively utilized and the structural redundancy is reduced; in addition, the height difference design of the card blocks on the outer needle connector and the inner needle connector makes it possible to achieve the sequential activation of the two gears of the inner biopsy outer needle with a single button operation, without the need for step-by-step operation, which not only improves the stability and reliability of the biopsy needle operation, but also significantly improves the operating efficiency and convenience of clinical use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of the three-dimensional structure of the invention;

[0025] Figure 2 A schematic diagram of a half-cut explosion structure of the invention;

[0026] Figure 3 A schematic diagram of the three-dimensional structure inside the housing of the invention device;

[0027] Figure 4A schematic diagram of the three-dimensional structure of the invention's snap-on connection portion, excitation component, and sampling component;

[0028] Figure 5 A schematic diagram of the three-dimensional structure of the biopsy outer needle, outer needle connector and movable button;

[0029] Figure 6 This is a schematic diagram of the three-dimensional structure of the T-shaped pressing piece of the trigger button box;

[0030] Figure 7 This is a schematic diagram of the connection structure between the T-shaped pressing piece and the double-speed clamping joint;

[0031] Figure 8 It is a schematic diagram of the three-dimensional structure of the spring limiting part of the invention;

[0032] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0033] 1. Device housing; 2. Sampling assembly; 21. Biopsy outer needle; 22. Biopsy inner needle; 3. Two-speed limit assembly; 31. Snap-fit connection; 311. Outer needle connector; 312. Inner needle connector; 32. Movable button; 33. Spring limiter; 331. Drive spring; 332. Limiting shaft; 34. Linear track; 35. Snap-fit spring; 4. Excitation assembly; 41. Two-speed snap-fit connector; 42. Elastic member; 43. Excitation button; 44. T-shaped pressing member; 45. Snap-fit structure; 46. Limiting column. DETAILED DESCRIPTION

[0034] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate several embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0038] It should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the technical product is usually placed when in use. They are only for the convenience of describing this technology and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as a limitation on this technology.

[0039] See also Figure 1-8 The two-stage excitation integrated biopsy needle includes a device housing 1, a sampling component 2 arranged on the surface of the device housing 1, a two-stage limiting component 3 for retracting the sampling component 2, and an excitation component 4 that allows the operator to control the excitation of the sampling component 2.

[0040] The sampling assembly 2 is a common component found in existing biopsy needles. Specifically, it includes an outer biopsy needle 21 and an inner biopsy needle 22, which resides within the outer biopsy needle 21. The sampling assembly 2 uses the outer biopsy needle 21 to perform puncture positioning, while the inner biopsy needle 22 is used to cut tissue samples. The two-position limiter assembly 3 and the activation assembly 4 work together to position the inner biopsy needle 21 in two different positions, adapting to different sampling conditions.

[0041] The two-speed limit assembly 3 includes a snap-fit connection portion 31 provided on the biopsy outer needle 21 and the biopsy inner needle 22, an active button 32 provided on the surface of the device housing 1 and connected to the snap-fit connection portion 31, and a spring limit portion 33 provided inside the device housing 1 and capable of limiting the snap-fit connection portion 31 from making linear motion inside the device housing 1. The snap-fit connection portion 31 is located inside the device housing 1, and the spring limit portion 33 can provide the snap-fit connection portion 31 with elastic force for moving in one direction. At the same time, the excitation assembly 4 includes a two-speed snap-fit joint 41 provided inside the device housing 1, an elastic member 42 connecting the device housing 1 and the two-speed snap-fit joint 41, and a spring limit portion 33 provided inside the device housing 1 and capable of limiting the linear motion of the snap-fit connection portion 31. The excitation button 43 is on the surface of the device housing 1, and the double-speed card joint 41 and the card connection part 31 are provided with mutually adapted card structures 45 on the surface. The excitation button 43 extends to one end inside the device housing 1 and contacts the double-speed card joint 41. After the excitation button 43 drives the double-speed card joint 41 to move, the double-speed card joint 41 is no longer carded with the card connection part 31. At this time, the inner biopsy needle 22 and the outer biopsy needle 21 are driven to move in turn by the card connection part 31. The double-speed card joint 41 cooperates with the card connection structure 45 of the card connection part 31 to ensure that the inner biopsy outer needle 21 moves sequentially when excited, avoiding false triggering due to step-by-step operation.

[0042] Example 1

[0043] Specifically, the snap-fit connection part 31 includes an outer needle connector 311 provided at the end of the biopsy outer needle 21, and an inner needle connector 312 provided at the end of the biopsy inner needle 22. The outer needle connector 311 and the inner needle connector 312 are both located on the surface of the spring limiting part 33. A linear track 34 is provided inside the device housing 1. The surfaces of the outer needle connector 311 and the inner needle connector 312 are both provided with sliders adapted to the linear track 34. The surface of the device housing 1 is provided with an active opening adapted to the active button 32. There are two active buttons 32, and the two active buttons 32 are respectively connected to the outer needle connector 311 and the inner needle connector 312. The matching structure of the linear track 34 and the slider ensures the coaxiality of the movement of the inner biopsy outer needle 21, reduces friction resistance, and at the same time, realizes the gear switching of the inner biopsy outer needle 21 through mechanical linkage to avoid manual adjustment errors.

[0044] Example 2

[0045] Different from Example 1, in order to ensure the stable double-speed loading of the biopsy inner needle 22 and the biopsy outer needle 21, a clamping spring 35 is provided between the double-speed clamping block and the device housing 1, and the number of clamping grooves provided on the surface of the double-speed clamping joint 41 is greater than or equal to two. The clamping block and the clamping groove are opposite to each other and are provided with an inclined surface for the clamping block to slide horizontally into the clamping groove. The spring and inclined surface design optimizes the clamping efficiency of the double-speed clamping joint 41. The number of double-speed clamping joints 41 is at least two, and at least two double-speed clamping joints 41 are respectively connected to the outer needle connector 311 and the inner needle connector 312 through the clamping structure 45. The excitation button 43 is provided with a T-shaped pressing piece 44 at one end close to the double-speed clamping joint 41, and the surface of the T-shaped pressing piece 44 away from the excitation button 43 is in contact with the two double-speed clamping joints 41 respectively, thereby achieving this.

[0046] Furthermore, in order to ensure that the driving spring 331 drives the biopsy outer needle 21 and the biopsy inner needle 22 at the same time, the spring limiting part 33 includes a limiting shaft 332 arranged inside the device housing 1, and a driving spring 331 arranged on the surface of the limiting shaft 332. The outer needle connector 311 and the inner needle connector 312 are both connected to the limiting shaft 332. The surfaces of the outer needle connector 311 and the inner needle connector 312 are both provided with movable holes that are compatible with the outside of the limiting shaft 332. The spring is arranged between the needle connector and the device housing 1, and the cooperation between the limiting shaft 332 and the movable hole further constrains the movement trajectory of the needle body to improve stability.

[0047] Example 3

[0048] The difference from Example 2 is that in order to save the internal space of the device while ensuring that the inner biopsy needle 22 and the outer biopsy needle 21 are driven separately, the number of drive springs 331 is at least two, and a hollow groove adapted to the drive spring 331 is provided inside the limit shaft 332, and there is at least one drive spring 331 inside and outside the limit shaft 332 respectively. A limit block capable of contacting the drive spring 331 is provided in the movable hole provided on the surface of the outer needle connector 311, and a slide groove adapted to the limit block is provided on the surface of the limit shaft 332. The design that the dual drive springs 331 are both located in one limit shaft 332 saves internal space, and at the same time, the cooperation between the limit block and the slide groove ensures that the springs are evenly stressed, thereby ensuring the stability of the device activity.

[0049] Example 4

[0050] Different from Example 3, the clamping structure 45 includes a clamping block provided on the outer needle connector 311 and the inner needle connector 312, and a clamping groove provided on the surface of the double-speed clamping joint 41 and adapted to the clamping block. The number of the clamping grooves is greater than or equal to two, the number of the clamping blocks is greater than or equal to one, the clamping block on the surface of the inner needle connector 312, and the clamping groove provided on the surface of the double-speed clamping joint 41 in contact with the inner needle connector 312 are smaller than the clamping block on the surface of the outer needle connector 311, and the clamping groove in contact with the outer needle connector 311 is smaller than the clamping block on the surface of the outer needle connector 311. The overall height of the card groove set on the surface of the double-speed card connector 41, the height of the T-shaped pressing piece 44 close to the outer needle connector 311 is higher than the height of the end close to the inner needle connector 312. The height difference design of the card blocks can ensure the excitation sequence of the inner biopsy outer needle 21. When the excitation button 43 is pressed, the T-shaped pressing piece 44 cooperates with the height difference of the card blocks on the two double-speed card connectors 41 to first release the card connection of the biopsy inner needle 22 and then release the card connection of the biopsy outer needle 21, realizing one-button double-speed excitation and effectively improving operating efficiency.

[0051] At the same time, in order to ensure that the double-speed card joint 41 and the T-shaped pressing piece 44 can perform stable vertical movement, a limiting column 46 is provided inside the device housing 1, and the surfaces of the T-shaped pressing piece 44 and the double-speed card joint 41 are provided with openings that are compatible with the limiting column 46. The T-shaped pressing piece 44 and the double-speed card joint 41 can perform linear movement under the action of the limiting column 46.

[0052] In the description of this technology, it should also be noted that, unless otherwise specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this technology based on the specific circumstances.

[0053] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. Two-stage excitation integrated biopsy needle, characterized by: include: Device housing (1); A sampling assembly (2) comprising an outer biopsy needle (21) and an inner biopsy needle (22) disposed inside the outer biopsy needle (21); A two-stage limiting assembly (3) comprises a snap-fit connection portion (31) provided on the biopsy outer needle (21) and the biopsy inner needle (22), a movable button (32) provided on the surface of the device housing (1) and connected to the snap-fit connection portion (31), and a spring limiting portion (33) provided inside the device housing (1) and capable of limiting the snap-fit connection portion (31) from performing linear motion inside the device housing (1), wherein the snap-fit connection portion (31) is located inside the device housing (1), and the spring limiting portion (33) is capable of providing an elastic force for the snap-fit connection portion (31) to move in one direction; An excitation component (4) comprises a double-speed clamping joint (41) provided inside the device housing (1), an elastic member (42) connecting the device housing (1) and the double-speed clamping joint (41), and an excitation button (43) provided on the surface of the device housing (1), wherein the double-speed clamping joint (41) and the clamping connection portion (31) are provided with mutually adapted clamping structures (45) on their surfaces, and one end of the excitation button (43) extends to the inside of the device housing (1) and contacts the double-speed clamping joint (41); After the activation button (43) drives the double-speed clamping joint (41) to move, the double-speed clamping joint (41) is no longer engaged with the clamping connection portion (31), and the inner biopsy needle (22) and the outer biopsy needle (21) are driven to move in sequence by the clamping connection portion (31).

2. The two-stage excitation integrated biopsy needle according to claim 1, characterized in that: The snap-fit connection portion (31) includes an outer needle connector (311) provided at the end of the biopsy outer needle (21), and an inner needle connector (312) provided at the end of the biopsy inner needle (22). The outer needle connector (311) and the inner needle connector (312) are both located on the surface of the spring limiting portion (33). A linear track (34) is provided inside the device housing (1), and a slider adapted to the linear track (34) is provided on the surface of the outer needle connector (311) and the inner needle connector (312).

3. The two-stage excitation integrated biopsy needle according to claim 1, characterized in that: The surface of the device housing (1) is provided with an active opening adapted to accommodate an active button (32). There are two active buttons (32), and the two active buttons (32) are respectively connected to the outer needle connector (311) and the inner needle connector (312).

4. The two-stage excitation integrated biopsy needle according to claim 1, characterized in that: The number of the card slots provided on the surface of the double-speed card joint (41) is greater than or equal to two, and a slope is provided at the position where the card block is opposite to the card slot so as to allow the card block to slide horizontally into the card slot.

5. The two-stage excitation integrated biopsy needle according to claim 1, characterized in that: The number of the double-speed clamping joints (41) is at least two, and at least two double-speed clamping joints (41) are respectively connected to the outer needle connector (311) and the inner needle connector (312) through a clamping structure (45). The end of the excitation button (43) close to the double-speed clamping joint (41) is provided with a T-shaped pressing piece (44), and the surface of the T-shaped pressing piece (44) away from the excitation button (43) is in contact with the two double-speed clamping joints (41) respectively.

6. The two-stage excitation integrated biopsy needle according to claim 1, characterized in that: The spring limiting portion (33) includes a limiting shaft (332) arranged inside the device housing (1), and a driving spring (331) arranged on the surface of the limiting shaft (332). The outer needle connector (311) and the inner needle connector (312) are both connected to the limiting shaft (332). The surfaces of the outer needle connector (311) and the inner needle connector (312) are both provided with movable holes that are compatible with the outside of the limiting shaft (332). The spring is arranged between the card needle connector and the device housing (1).

7. The two-stage excitation integrated biopsy needle according to claim 1, characterized in that: The number of the driving springs (331) is at least two, a hollow groove adapted to the driving spring (331) is provided inside the limiting shaft (332), and there is at least one driving spring (331) inside and outside the limiting shaft (332), a limiting block capable of contacting the driving spring (331) is provided in the movable hole provided on the surface of the outer needle connector (311), and a sliding groove adapted to the limiting block is provided on the surface of the limiting shaft (332).

8. The two-stage excitation integrated biopsy needle according to claim 1, characterized in that: The clamping structure (45) comprises a clamping block provided on the outer needle connector (311) and the inner needle connector (312), and a clamping slot provided on the surface of the double-speed clamping joint (41) and adapted to the clamping block. The number of the clamping slots is greater than or equal to two, and the number of the clamping blocks is greater than or equal to one.

9. The two-stage excitation integrated biopsy needle according to claim 1, characterized in that: The overall height of the block on the surface of the inner needle connector (312) and the card groove provided on the surface of the double-speed card connector (41) in contact with the inner needle connector (312) is smaller than the overall height of the block on the surface of the outer needle connector (311) and the card groove provided on the surface of the double-speed card connector (41) in contact with the outer needle connector (311), and the height of the end of the T-shaped pressing member (44) close to the outer needle connector (311) is higher than the height of the end close to the inner needle connector (312).

10. The two-stage excitation integrated biopsy needle according to claim 1, characterized in that: A limiting column (46) is provided inside the device housing (1); openings adapted to the limiting column (46) are provided on the surfaces of the T-shaped pressing piece (44) and the double-speed clamping joint (41); and the T-shaped pressing piece (44) and the double-speed clamping joint (41) can perform linear motion under the action of the limiting column (46).

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