CN212438684U - Biopsy device and sampling stroke adjusting mechanism thereof - Google Patents

Abstract

The utility model discloses a biopsy device and a sampling stroke adjusting mechanism thereof, wherein the sampling stroke adjusting mechanism comprises a sampling stroke button, the sampling stroke button is provided with a hook boss and an avoidance groove, and the hook boss or the avoidance groove can be arranged on the front-back movement path of a first elastic barb on a first slide block by moving the sampling stroke button; when the sampling stroke button is in a locking state, the hooking boss is arranged on a forward and backward moving path of the first elastic barb, the first elastic barb can be hooked and positioned with the hooking boss so as to realize locking of the upper chord, and only part of the sampling groove of the needle core can be exposed out of the needle tube so as to realize non-full-stroke sampling; when the sampling stroke button is in an unlocked state, the first elastic barb can freely pass through without obstruction, and full-stroke sampling can be implemented. The scheme can be suitable for lesion tissues with different sizes, and tissue samples with different lengths can be obtained.

Description

Biopsy device and sampling stroke adjusting mechanism thereof

Technical Field

The utility model relates to the field of medical equipment, a biopsy device for living tissue sample is related to, especially relate to a multi-functional full-automatic biopsy device and sample stroke guiding mechanism thereof.

Background

The biopsy device is a medical instrument and is suitable for sampling living tissues of various organs such as liver, kidney, lung, prostate, mammary gland, thyroid and the like, sucking cells and the like. Has the characteristics of simple and quick operation, convenient use, quick sampling and the like.

Since the American Padd company has been leading in the market since it develops and sells biopsy needle products earlier, the Japanese TSK company has also introduced fully automatic biopsy needle products after Batd, giving doctors more choices clinically. The full-automatic biopsy needle can be operated by a single hand, has small winding difficulty, has two holding modes of front and back 2 trigger triggers and transverse holding/straight holding, is convenient for a doctor to select according to actual conditions, is simple and convenient to operate, is rapid to sample, has low risk, and receives the favorable comment of numerous clinicians.

Patent document CN104797200 discloses a biopsy device comprising a cutting cannula mechanism having a cutting cannula and an inner stylet mechanism having an inner stylet coaxial with the cutting cannula. The cocking mechanism is configured to cock the cutting cannula mechanism and the inner stylet mechanism by retracting each of the cutting cannula and the inner stylet in a proximal direction to a cocked position. The trigger device is configured to fire at least one of the inner stylet mechanism and the cutting cannula mechanism to advance the respective at least one of the inner stylet and the cutting cannula in a distal direction from the cocked position. The selector assembly includes a selector switch having an external tab accessible by a user. The selector assembly is configured to select between at least two user-selectable operating modes and at least two user-selectable firing distances.

However, biopsy devices currently on the market also have certain drawbacks, such as: the reliability of the firing device is not high, and the situation that the firing cannot be carried out or the firing is difficult occurs; the firing device is not provided with a safety button, so that the situation of error firing is easy to occur; the inner needle and the outer needle are triggered in a linkage manner, so that the feedback sampling effect of a client is not ideal; moreover, the full-automatic needle can not be used for winding by one hand, and needs to be pulled by two hands to wind, so that the operation is complicated; the product only has one trigger position/trigger button, can not be held transversely, is inconvenient to use and the like. Moreover, there is only one sampling stroke (or full-stroke sampling or full-trough sampling), and when only a small amount of tissue needs to be sampled, the biopsy device with shorter sampling stroke needs to be replaced, which causes inconvenience and increased use cost.

Disclosure of Invention

In order to solve the technical problem, the utility model aims at providing a biopsy device and sample stroke guiding mechanism thereof is provided with the sample stroke button, can be suitable for the pathological change tissue of equidimension not, can get the tissue sample of different length, not only has the advantage that the usage is wide, can also reduce the damage to healthy tissue, effectively reduces patient's painful sense.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a sampling stroke adjusting mechanism of a biopsy device comprises a sampling stroke button (15), wherein the sampling stroke button (15) is provided with a hooking boss (151) and an avoiding groove (154), and the hooking boss (151) or the avoiding groove (154) can be arranged on a front-back moving path of a first elastic barb (61) on a first sliding block (6) by moving the sampling stroke button (15); when the sampling stroke button (15) is in a locked state, and the hooking boss (151) is arranged on a forward and backward movement path of the first elastic barb (61), the first elastic barb (61) can be hooked and positioned with the hooking boss (151) to realize winding locking, and when the first sliding block (6) is locked at the position, only part of a sampling groove of the needle core (1) can be exposed out of the needle tube (2) to realize non-full-stroke sampling; when the sampling stroke button (15) is in an unlocking state, the first elastic barb (61) can freely pass through without obstruction when the avoidance groove (154) is arranged on the forward and backward movement path of the first elastic barb (61).

Preferably, an elastic body (21) used for returning the sampling stroke button (15) to an unlocked state from a locked state is connected to the sampling stroke button (15), the movable end of the elastic body (21) is connected with the sampling stroke button (15), the fixed end of the elastic body (21) is connected with the mounting frame or the handle shell, a positioning structure used for positioning the sampling stroke button (15) in the locked state is arranged on the sampling stroke button (15), and the positioning structure can be driven by the trigger connecting rod (13) to be released from positioning, so that the sampling stroke button (15) can be returned to the unlocked state from the locked state under the driving of the elastic body (21).

Preferably, the elastic body (21) is a V-shaped elastic sheet, the middle part of the V-shaped elastic sheet is fixed on the sampling stroke button (15), and two ends of the V-shaped elastic sheet are arranged on the mounting frame.

Preferably, the positioning structure comprises a first arm (152) and a second arm (155), fixed ends of the first arm (152) and the second arm (155) are fixedly connected with one end of the sampling stroke button (15) or integrally formed, a gap is reserved between the first arm (152) and the second arm (155), free ends of the first arm (152) and the second arm (155) can approach each other and elastically recover, the second arm (155) is longer than the first arm (152), a first hook (153) is formed on one side, far away from the second arm (155), of the free end of the first arm (152), and a clamping hole (221) for inserting the first arm (152) and the second arm (155) is formed in the mounting frame; when the sampling stroke button (15) is in a locking state, the free ends of the first arm (152) and the second arm (155) penetrate through the clamping hole (221) and the first clamping hook (153) on the first arm (152) is clamped with the clamping hole (221) so as to position the sampling stroke button (15) in the locking state; when the sampling device is used for triggering, the pushing part (138) arranged at the front part of the triggering connecting rod (13) pushes the free end of the first arm (152) to enable the first hook (153) to be separated from the clamping hole (221) on the mounting frame and to be released from positioning, so that the sampling stroke button (15) is restored to the unlocking state from the locking state under the driving of the restoring elasticity of the elastic body (21), and the free end of the first arm (152) is withdrawn from the clamping hole (221).

Preferably, the first arm (152) and the second arm (155) are disposed in front and rear and the second arm (155) is located in front of the first arm (152).

Preferably, a second hook (156) is arranged on one side of the free end of the second arm (155) far away from the first arm (152), and the sampling stroke button (15) is prevented from being pulled out of the mounting frame through the limit matching of the second hook (156) and a clamping hole (221) on the mounting frame.

Preferably, the elastic body (21) and the first and second arms (152, 155) are located on the left and right sides of the hooking boss (151) and the escape groove (154), respectively. The fixed ends of the first arm (152) and the second arm (155) extend to the position of the avoidance groove (154).

Preferably, the sampling travel button (15) is provided with a limit boss for limiting the first sliding block (6) to move backwards continuously behind the hooking boss (151), and a space for accommodating the hooking protrusion of the first elastic barb (61) is reserved between the limit boss and the hooking boss (151).

A biopsy device comprises the sampling stroke adjusting mechanism of the biopsy device and further comprises an installation frame, wherein a first sliding block (6), a first trigger spring (7), a first trigger block (16), a second sliding block (10), a second trigger spring (11), a second trigger block (23) and a trigger connecting rod (13) are arranged on the installation frame, and the first sliding block (6) and the second sliding block (10) are respectively connected with the installation frame in a front-back sliding mode and are arranged in a front-back mode; the first sliding block (6) is fixedly connected with the rear end of the needle tube (2), the front end of the first firing spring (7) abuts against the first sliding block (6), the rear end of the first firing spring (7) abuts against the installation frame, a first elastic barb (61) is arranged on the first sliding block (6), and the first sliding block (6) is hooked and locked through the first elastic barb (61) after moving backwards in place; the second sliding block (10) is fixedly connected with the rear end of the needle core (1), the front end of a second trigger spring (11) abuts against the second sliding block (10), the rear end of the second trigger spring (11) abuts against the installation frame, a second elastic barb (101) is arranged on the second sliding block (10), and the second sliding block (10) moves backwards in place and is locked by the hook of the second elastic barb (101); the trigger connecting rod (13) is arranged on the mounting frame and can move back and forth, the trigger connecting rod (13) is movably connected with the first trigger block (16) and can drive the first trigger block (16) to enable the first sliding block (6) to be unlocked, the trigger connecting rod (13) is movably connected with the second trigger block (23) and can drive the second trigger block (23) to enable the second sliding block (10) to be unlocked, and the front end of the trigger connecting rod (13) is provided with a pushing part (138) used for pushing the sampling stroke button (15).

The winding firing method of the biopsy device comprises the following steps:

adjusting the sampling stroke: the sampling travel button (15) is pushed, the sampling travel button (15) enters a locking state from an unlocking state and is positioned in the locking state through the positioning structure, and at the moment, the hook boss (151) on the sampling travel button (15) is arranged on a front-back movement path of the first elastic barb (61) of the first sliding block (6).

Winding: the first sliding block (6) moves backwards to compress the first firing spring (7) until a first elastic barb (61) on the first sliding block (6) is locked with a hooking boss (151) on the sampling stroke button (15), and the first sliding block (6) and the needle tube (2) finish winding; the second slider (10) moves backwards to compress a second firing spring (11) until the second slider (10) and the needle core (1) finish winding;

firing: the rear firing button (131) is pressed or the side firing button (17) is pushed forwards to drive the firing connecting rod (13) to move forwards; firstly, the second slider (10) is unlocked by the firing connecting rod (13) through the second firing block (23), the second slider (10) moves forwards under the pushing of the second firing spring (11), and the unlocking firing of the second slider (10) and the needle core (1) is completed; at the moment, the sampling stroke button (15) keeps a locking state, and part of the sampling groove of the needle core (1) is exposed out of the front end of the needle tube (2); then, as the trigger link (13) moves forward continuously, the pushing part (138) at the front end of the trigger link (13) unlocks the positioning structure of the sampling stroke button (15), the sampling stroke button (15) returns to the unlocking state from the locking state under the driving of the return elasticity of the elastic body (21), the hooking boss (151) of the sampling stroke button (15) and the first elastic barb (61) of the first slide block (6) are unlocked, the first slide block (6) moves forward under the pushing of the first trigger spring (7) to finish the unlocking and triggering of the first slide block (6) and the needle tube (2), and the needle tube (2) moves forward to take the sampling groove of the needle core (1) into the front end of the needle core.

The utility model discloses owing to adopted above technical scheme, be provided with the sample stroke button, position state through the sample stroke button switches, the adjustment to biopsy device sample stroke (sample volume) has been realized, moreover, the steam generator is simple in structure, and convenient operation is reliable, can be suitable for the pathological change tissue of equidimension not, can get the tissue sample of different length, not only have the advantage that the usage is wide, can also reduce the damage to healthy tissue, effectively reduce patient's painful sense, and the stylet needle tube can be fired in proper order, the tissue can be abundant fall into in the interior needle sample groove, it is effectual to sample, and is rational in infrastructure, and the simple operation is comfortable.

Drawings

FIG. 1 is a perspective view of embodiment 1;

FIG. 2 is an exploded view of example 1;

FIG. 3 is a schematic structural view of the firing link;

FIG. 4 is a schematic view of the mating arrangement of the firing link and the sample travel button;

FIG. 5 is a schematic view of the mating arrangement of the first mounting frame and associated components;

FIG. 6 is a schematic view of the mating arrangement of the first mounting frame, firing link and associated components;

FIG. 7 is a schematic view (perspective one) of the mating arrangement of two mounting frames, firing links and associated components;

FIG. 8 is a schematic view of the mating arrangement of the second mounting frame, firing link and associated components;

FIG. 9 is a schematic view of the mating arrangement of two mounting frames, firing links and associated components (view two);

FIG. 10 is a partial sectional view (safety button lock) of embodiment 1;

FIG. 11 is one of the upper chord schematic views of embodiment 1;

FIG. 12 is a second drawing showing the upper chord of the embodiment 1;

FIG. 13 is a partial cross-sectional view of the winding state of example 1 (safety button open, full stroke sample);

FIG. 14 is one of the firing diagrams of embodiment 1;

FIG. 15 is a second firing schematic of example 1;

FIG. 16 is a schematic structural view of the firing state of embodiment 1 (firing link reset);

FIG. 17 is a schematic top chord view of a non-full stroke sample according to example 1;

FIG. 18 is a bottom view (in partial cross-section) of FIG. 17;

FIG. 19 is a partial cross-sectional view of FIG. 17;

FIG. 20(a) is one of the full stroke sampling diagrams;

FIG. 20(b) is a second schematic diagram of a full stroke sampling;

FIG. 20(c) is a third schematic diagram of a full stroke sampling;

FIG. 21(a) is one of the non-full stroke (half stroke) sampling schematic diagrams;

FIG. 21(b) is a second schematic diagram of non-full stroke (half stroke) sampling;

FIG. 21(c) is a third schematic diagram of a non-full stroke (half stroke) sampling.

Wherein, 1, a stylet, 2, a needle tube, 3, a cannula, 4, a first shell, 5, a first shock-absorbing gasket, 6, a first slide block, 61, a first elastic barb, 62, a first connecting part, 7, a first trigger spring, 8, a first mounting frame, 81, a second slide way, 82, a second long hole, 83, a first slide way, 84, a first long hole, 85, a fourth slide way, 86, a fifth slide way, 87, a reset spring space, 88, a third slide way, 89, a positioning bulge, 9, a second shock-absorbing gasket, 10, a second slide block, 101, a second elastic barb, 102, a second connecting part, 11, a second trigger spring, 12, a safety button, 121, a locking part, 122, a limiting bulge, 123, a positioning groove, 13, a trigger connecting rod, 131, a rear trigger button, 132, a locking groove, 133, a second chute, 1331, a second chute lifting section, 1332, a second chute holding section, 134. the reset portion 135, the connecting portion 136, the first sliding groove 1361, the first sliding groove holding section 1362, the first sliding groove lifting section 137, the limiting portion 138, the pushing portion 139, the guide rib 14, the first winding button 141, the first clamping groove 15, the sampling stroke button 151, the hooking boss 152, the first arm 153, the first clamping hook 154, the avoiding groove 155, the second arm 156, the second clamping hook 16, the first hair striking block 161, the first connecting column 17, the side hair striking button 171, the limiting clamping protrusion 18, the reset spring 19, the second winding button 191, the second clamping groove 20, the second shell 21, the elastic body 22, the second mounting frame 220, the positioning column 221, the clamping hole 23, the second connecting column 231, and the second connecting column.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1:

for convenience of description and understanding, in the present embodiment, the sampling end of the stylet is the front, the handle end is the rear, and the left-right direction and the up-down direction are respectively defined by the vertical front-back direction.

A biopsy device as shown in fig. 1 and fig. 2, comprising a needle core 1, a needle tube 2, and an operating handle for operating the needle core and the needle tube to perform biopsy sampling, wherein the operating handle comprises an installation frame, a first slider 6, a first trigger spring 7, a second slider 10, and a second trigger spring 11 are arranged in the installation frame, a rear end of the needle tube 2 is fixedly connected with the first slider 6, a rear end of the needle core 1 penetrates through the needle tube 2 and the first slider 6 and then is fixedly connected with the second slider 10, a front end of the first trigger spring 7 abuts against the needle tube 2, a rear end of the first trigger spring 7 abuts against the installation frame, a front end of the second trigger spring 11 abuts against the second slider 10, and a rear end of the second trigger spring 11 abuts against the installation frame; the mounting frame is further provided with an upper chord firing mechanism for driving the first slider 6 and the second slider 10 to move backwards and position and compressing and accumulating the first firing spring 7 and the second firing spring 11, and a firing unlocking mechanism for releasing the positioning of the first slider 6 and/or the second slider 10.

The upper chord firing mechanism comprises a first upper chord button 14, a second upper chord button 19, a first firing block 16 and a second firing block 23, the first upper chord button 14 is connected with a first sliding block 6 and can drive the first sliding block 6 to move backwards, a first elastic barb 61 is arranged on the first sliding block 6, after the first sliding block 6 moves backwards to the right position, the first elastic barb 61 is hooked and locked with the first firing block 16, the second upper chord button 19 is connected with a second sliding block 10 and can drive the second sliding block 10 to move backwards, a second elastic barb 101 is arranged on the second sliding block 10, after the second sliding block 10 moves backwards to the right position, the second elastic barb 101 is hooked and locked with the second firing block 23, and the first firing block 16 and the second firing block 23 are movably connected with an installation frame respectively.

The triggering unlocking mechanism comprises a triggering connecting rod 13, the triggering connecting rod 13 is arranged on the installation frame and can move back and forth, the triggering connecting rod 13 is movably connected with the first triggering block 16 and can drive the first triggering block 16 and the first elastic barb 61 to remove the locking state, and the triggering connecting rod 13 is movably connected with the second triggering block 23 and can drive the second triggering block 23 and the second elastic barb 101 to remove the locking state.

In this embodiment, as shown in fig. 2, the mounting frame includes a first mounting frame 8 and a second mounting frame 22 that are fixed in a left-right matching manner, a handle housing is fixed outside the mounting frame, the handle housing includes a first housing 4 and a second housing 20 that are fixed in a left-right matching manner, the first housing 4 and the second housing 20 are fixedly connected through a fastening member, the first mounting frame 8 and the second mounting frame 22 are fixedly connected through a fastening member, and the mounting frame and the housings are fixed through a positioning column 220 and a positioning groove in a matching manner. Therefore, the structure is simple and reasonable, the assembly is convenient, and the cost performance is high.

In this embodiment, the stylet 1 (e.g., the rear end of the stylet) is provided with anti-slip and anti-slip features (e.g., concave and convex), which can firmly fix (e.g., bond) the stylet to the slider 10; the needle cannula 2 (e.g., the rear end of the needle cannula) is provided with anti-slip and anti-slip features (e.g., flare, flange, etc.) that enable the needle cannula to be securely attached (e.g., bonded) to the slider 6.

In this embodiment, it is preferable that a sleeve 3 is fixed to the front end of the handle housing, and the hub 1 and the needle tube 2 are inserted through the sleeve 3, so that the sleeve 3 can ensure the coaxiality of the hub 1 and the needle tube 2 during movement.

In this embodiment, as shown in fig. 1 and fig. 2, the first winding button 14 and the second winding button 19 are disposed at the front end of the handle housing and are disposed side by side left and right, the extension arm of the first winding button 14 extending into the handle housing is connected to the first slider 6 to be able to push the first slider 6 backward, the extension arm of the second winding button 19 extending into the handle housing is connected to the second slider 10 to be able to push the second slider 10 backward, and the extension arm of the first winding button 14 and the extension arm of the second winding button 19 are disposed at the left and right sides of the mounting frame, respectively. Therefore, the needle core and the needle tube are respectively and independently subjected to winding operation by pressing the two winding buttons, the operation is convenient, the structure is reasonable, and the winding percussion action is reliable and stable.

As shown in fig. 7 and 9, preferably, the first slider 6 is provided with a first connecting portion 62, the first connecting portion 62 extends out of a first long hole 84 on the mounting frame and is connected with the extension arm of the first winding button 14, and when the first slider 6 moves back and forth, the first connecting portion 62 moves back and forth along the first long hole 84; the second slider 10 is provided with a second connecting portion 102, the second connecting portion 102 extends out of the second long hole 82 of the mounting frame and is connected with the extension arm of the second winding button 19, and when the second slider 10 moves back and forth, the second connecting portion 102 moves back and forth along the second long hole 82. Therefore, the structure is reasonable, the installation is convenient, and the connection is reliable. In other embodiments, the connecting portion may also be fixedly or integrally formed on the extension arm of the winding button, and inserted into the slider in the mounting frame after passing through the long hole in the mounting frame. Preferably, the extension arm of the first winding button 14 is matched with the first clamping groove 141 and the first connecting part 62 to push the first slider 6 backwards, and the extension arm of the second winding button 19 is matched with the second clamping groove 191 and the second connecting part 102 to push the second slider 10 backwards. Furthermore, the clamping groove is used for limiting the connecting part from the front side and the back side, so that the winding button and the corresponding sliding block move synchronously, and thus, an operator can intuitively know whether the biopsy device is in a winding state or not, and repeated operation is avoided. In other embodiments, the extension arm of the winding button is connected with the corresponding sliding block and performs winding only when the winding button is pressed, after the winding is completed, the extension arm of the winding button is separated from the corresponding sliding block, the sliding block and the needle core or the needle tube of the sliding block are independently fired, the winding button is not driven to move together, and in order to avoid the arbitrary movement of the winding button, a spring can be arranged in the handle shell to reset the winding button. The connecting portion may be cylindrical, square cylindrical or any other shape capable of transmitting a force.

In this embodiment, as shown in fig. 5 to 9, the front portion of the mounting frame is provided with a first slide rail 83, the first slider 6 and the first trigger spring 7 are installed in the first slide rail 83, the rear portion of the mounting frame is provided with a second slide rail 81, the second slider 10 and the second trigger spring 11 are installed in the second slide rail 81, and blocking portions are respectively provided at the front end of the first slide rail 83, the rear end of the second slide rail 81, and between the first slide rail 83 and the second slide rail 81, so that the first slider 6 is limited to slide in the first slide rail 83, and the second slider 10 is limited to slide in the second slide rail 81. A third slideway 88 and a fourth slideway 85 are arranged on the mounting frame, the third slideway 88 is communicated with the first slideway 83, the third slideway 88 is provided with a front side wall and a rear side wall so as to limit the first percussion block 16 to move back and forth, the first percussion block 16 slides up and down along the third slideway 88, and one end of the first percussion block 16 is close to or far away from the first slideway 83 so as to realize locking and unlocking with the first elastic barb 61 on the first sliding block 6; the fourth slideway 85 is communicated with the second slideway 81, the fourth slideway 85 is provided with a front side wall and a rear side wall so as to limit the second firing block 23 to move back and forth, the second firing block 23 slides up and down along the fourth slideway 85, and one end of the second firing block 23 is close to or far away from the second slideway 81 so as to realize locking and unlocking with the second elastic barb 101 on the second slider 10. Like this, the gliding mode of percussion piece adoption and slider locking or unblock cooperation, the percussion piece can be firmly restricted to the slide lateral wall during the locking, simple structure, and the locking is reliable stable to, two independent locking of two percussion pieces difference and two sliders of unblock, the percussion time in proper order that can effective control or reasonable design nook closing member needle tubing guarantees good sample effect.

In this embodiment, the front end of the first slider 6 is provided with the first cushion ring 5, and the first cushion ring 5 has the function of buffering the first slider 6 from impacting the front blocking part of the first slideway 83, so as to reduce noise and prolong the service life; the front end of the second sliding block 10 is provided with a second damping washer 9, and the second damping washer 9 has the function of buffering the second sliding block 10 to impact the front blocking part of the second sliding rail 81, so that noise is reduced, and the service life is prolonged. Be provided with the shock washer on the slider, can cushion the impact of slider, reduce the sense of fear that noise at work brought the patient, user uses and experiences betterly.

In this embodiment, as shown in fig. 3 and 4, the firing link 13 is connected with the first connecting post 161 via the first runner 136 in a matching manner so as to drive the first firing block 16 to move up and down, the firing link 13 is connected with the second connecting post 231 via the second runner 133 in a matching manner so as to drive the second firing block 23 to move up and down, wherein the first runner 136 includes a first runner holding section 1361 that cannot drive the first firing block 16 to move up and down and a first runner lifting section 1362 that is used to drive the first firing block 16 to move up and down, and the second runner 133 includes a second runner holding section 1332 that cannot drive the second firing block 23 to move up and down and a second runner lifting section 1331 that is used to drive the second firing block 23 to move up and down; when the trigger link 13 moves forwards or backwards to trigger, the second trigger block 23 is firstly driven to move, so that the second slider 10 connected with the needle core 1 is triggered to unlock, and then the first trigger block 16 is driven to move, so that the first slider 6 connected with the needle tube 2 is triggered to unlock. Like this, two spouts adopt the mode that the segmentation set up to realize the linkage of two sliders and fire in proper order, the length cooperation through setting up the section of keeping of two spouts and lift section can be convenient adjustment design nook closing member needle tube fire interval in proper order, fully guarantee fine sample effect to simple structure, convenient to use, the operation is reliable.

In this embodiment, the firing link 13 is moved forward to effect firing, the first chute holding section 1361 is located in front of the first chute lifting section 1362 and both are in communication, and the second chute lifting section 1331 is located in front of the second chute holding section 1332 and both are in communication. Therefore, the structure is reasonable, the use is convenient, and the operation habit of doctors is met. In other embodiments, the firing link 13 may also effect firing through other movement means, for example, the firing link 13 is moved backwards to effect firing, in which case the first chute holding section 1361 is located behind and in communication with the first chute lifting section 1362 and the second chute lifting section 1331 is located behind and in communication with the second chute holding section 1332.

Preferably, the first sliding chute 136 and the second sliding chute 133 are through holes or grooves having upper side walls and lower side walls, such sliding chutes can drive the trigger block to move upwards and also can drive the trigger block to move downwards, and the two trigger blocks do not need to be provided with a reset mechanism (such as a reset spring) so as to facilitate installation and reduce cost.

In other embodiments, the first sliding slot 136 and/or the second sliding slot 133 is a flange or a groove with only upper or lower side walls, and the sliding slot can drive the firing block to move upwards or downwards to contact the locking state of the firing block and the elastic hook, and the firing block needs to be provided with a reset mechanism (such as a reset spring and the like) to be reset.

Preferably, the sliding groove holding section is straight in front and back, the sliding groove lifting section is in a slope shape, and the holding section and the lifting section of the two sliding grooves are arranged oppositely in front and back, so that one of the two sliding grooves is in an L shape, and the other sliding groove is in an inverted L shape.

In this embodiment, the first sliding slot 136 and the second sliding slot 133 are disposed on the firing rod 13, the first connecting rod 161 is disposed on the first firing block 16, and the second connecting rod 231 is disposed on the second firing block 23. Like this, the structure is simple reasonable reliable more, and the percussion action is accurate quick, removes more smoothly reliably, and the percussion connecting rod is more laborsaving. In other embodiments, the following may be possible: the first sliding chute 136 is arranged on the first firing block 16, the second sliding chute 133 is arranged on the second firing block 23, and the first connecting column 161 and the second connecting column 231 are arranged on the firing connecting rod 13, so that the volume of the firing block is large.

In this embodiment, the first and second firing blocks 16, 23 are located below the first and second ramps 83, 81, respectively.

In this embodiment, as shown in fig. 5 and 8, a reset portion 134 is disposed on the firing link 13, and a reset spring 18 is disposed between the reset portion 134 and the mounting frame, so that after the firing link 13 moves and is fired, the firing link 13 is driven to reset by the reset spring 18. Preferably, a return spring space 87 and a fifth slide way 86 are arranged on the mounting frame, the return spring 18 is limited in the return spring space 87, the rear end of the return spring space 87 is communicated with the fifth slide way 86, the return part 134 on the firing connecting rod 13 is inserted in the fifth slide way 86 and can move back and forth, when the firing connecting rod 13 moves forward, the front end of the return spring 18 abuts against the mounting frame, and the rear end of the return spring 18 abuts against the return part 134 on the firing connecting rod 13. Therefore, the trigger connecting rod can reset quickly, is convenient to install, moves stably and reliably in a front-back guiding mode, has smaller moving trigger resistance of the trigger connecting rod 13, and is convenient for an operator to operate.

In this embodiment, as shown in fig. 5 and 8, the first slide rail 83 and the second slide rail 81 are formed by the first mounting frame 8 and the second mounting frame 22 which are arranged together. As shown in fig. 5 to 9, the third slide way 88, the fourth slide way 85 and the fifth slide way 86 are disposed on the first mounting frame 8, and the trigger link 13 is disposed between the first mounting frame 8 and the second mounting frame 22 and located on the left side or the right side of the third slide way 88, the fourth slide way 85 and the fifth slide way 86, so that the structure is reasonable, the assembly is convenient, and the operation is reliable and stable.

Wherein preferably the firing link 13 forms an enlarged area at a corresponding location with the third and fourth ramps 88, 85 to better confine the firing block within the corresponding ramp. Wherein preferably, a guide rib 139 is formed on a side wall of the firing link 13 close to the second mounting frame 22, and the guide rib 139 is in sliding fit with a corresponding guide groove or front and back guide arranged on the second mounting frame 22, so that the structure is more reasonable, the matching motion is more reliable, and the material is saved. In other embodiments, a guide slot may be formed on a side wall of the firing link 13 near the second mounting frame 22, and the guide slot is in front-back guiding sliding fit with a corresponding guide rib provided on the second mounting frame 22.

In this embodiment, as shown in fig. 3-4 and 6-9, the firing link 13 is pushed by a rear firing button 131 or a side firing button 17 exposed outside the handle housing, and the rear firing button 131 or the side firing button 17 is integrally formed with or fixedly engaged with the firing link 13. Preferably, the rear firing button 131 is integrally formed at the rear end of the firing connecting rod 13, the side firing button 17 is fixedly connected with the firing connecting rod 13 through insertion fit, and the side firing button 17 is in limit fit with the handle shell through the limit clamping protrusion 171 and realizes front and rear guide movement. In this embodiment, one side of percussion connecting rod 13 is equipped with connecting portion 135, the side is struck and is sent out button 17 and insert be equipped with on the inside extension arm of handle casing with connecting portion 135 plug bush complex draw-in groove, the left and right sides of side is struck and is sent out button 17 all is equipped with spacing protruding 171 of card, two spacing protruding 171 of card insert in the handle casing and with the spacing cooperation of handle casing buckle.

In order to avoid the situation that the firing button is collided after the product is wound, and the firing button is mistakenly fired, a safety button 12 is further arranged, the safety button 12 is inserted into the handle shell and passes through one side of the firing connecting rod 13, at least one end of the safety button 12 protrudes out of the handle shell, the safety button 12 and the firing connecting rod 13 are limited through the matching of the locking part 121 and the locking groove 132, so that the firing connecting rod 13 is locked and fixed, and the locking part 121 and the locking groove 132 are separated from matching through moving the safety button 12, so that the firing connecting rod 13 is unlocked. Set up the safety button, can effectively prevent the maloperation, the sampling process is safer. In this embodiment, the safety button 12 moves up and down in the handle housing, the locking portion 121 is disposed on the safety button 12, the corresponding locking recess 132 is disposed on the trigger link 13, when the safety button 12 is moved up, the locking portion 121 leaves the locking recess 132, the trigger link 13 can move back and forth to implement triggering, when the safety button 12 is moved down, the locking portion 121 is clamped into the locking recess 132 to implement limit locking, and the trigger link 13 cannot move back and forth. Insurance button 12 is located the rear end of installation frame, and the installation frame rear end is equipped with location arch 89, correspondingly, is equipped with two positioning groove 123 on the insurance button 12, and location arch 89 and positioning groove 123 cooperate the realization to the location that insurance button 12 reciprocated the position, form clear gear and feel and avoid insurance button 12 not hard up or the arbitrary activity influence use under locking state and unlocking state. In order to prevent the safety button 12 from falling out of the handle case, a limiting protrusion 122 is further provided on the safety button 12, and the limiting protrusion 122 and the locking part 121 together can limit the up-down moving range of the safety button 12.

In order to adjust the sampling stroke, the biopsy sampling of a plurality of sampling strokes is realized on one biopsy device, and a sampling stroke adjusting mechanism is further provided, as shown in fig. 4, 6 and 7, the sampling stroke adjusting mechanism comprises a sampling stroke button 15, the sampling stroke button 15 is provided with a hooking boss 151 and an avoiding groove 154, and the hooking boss 151 or the avoiding groove 154 can be arranged on the back-and-forth moving path of the first elastic barb 61 on the first slide block 6 by moving the sampling stroke button 15; when the sampling stroke button 15 is in a locked state, that is, the hooking protrusion 151 is disposed on the forward and backward movement path of the first elastic barb 61, as shown in fig. 17 to 19, the first elastic barb 61 can be hooked and positioned with the hooking protrusion 151 to realize chordal locking, and when the first slider 6 is locked at this position, only a part of the sampling groove of the stylet 1 can be exposed out of the needle tube 2 to be able to perform non-full stroke (or half stroke sampling; when the sampling stroke button 15 is in an unlocked state, that is, the escape groove 154 is disposed on the forward and backward movement path of the first elastic barb 61, the first elastic barb 61 can freely pass through without being obstructed, the first elastic barb 61 can be hooked and positioned with the first trigger block 16 to realize chordal locking, and when the first slider 6 is locked at this position, the whole sampling groove of the stylet 1 can be exposed out of the needle tube 2 to be able to perform full stroke sampling, through the position state switching of sample stroke button 15, realized the adjustment to biopsy device sample stroke (sample volume), simple structure is reasonable, and convenient operation is reliable, can be suitable for the pathological change tissue of equidimension not, can get the tissue sample of different length, not only has the advantage that the usage is wide, can also reduce the damage to healthy tissue, effectively reduces patient's painful sense.

The above-mentioned "full-stroke sampling", also called full-notch sampling, means that all sampling notches of the needle core 1 are punctured into the target sampling tissue to obtain the biopsy sample, and the specific process is as follows:

after the needle core 1 and the needle tube 2 are wound, the sampling grooves of the needle core 1 are completely received in the needle tube 2, and the front ends of the needle core and the needle tube are pierced into the target sampling tissue 100, as shown in fig. 20 (a); firstly, the needle core 1 is triggered to pierce into the target sampling tissue 100, all sampling grooves on the needle core 1 are exposed outside the needle tube 2, and the target sampling tissue 100 fills all the sampling grooves, as shown in fig. 20 (b); the needle tube 2 is then fired, and the biopsy sample 301 is cut out from the target tissue 100 by the needle tube 2 and stored in the sample well of the core, as shown in fig. 20 (c).

The above-mentioned "non-full stroke sampling", also called partial stroke sampling or half stroke sampling, means that a part of the sampling slot of the needle core 1 pierces into the target sampling tissue to obtain the biopsy sample, and the specific process is as follows:

after the needle core 1 and the needle tube 2 are wound, the sampling grooves of the needle core 1 are completely received in the needle tube 2, and the front ends of the needle core and the needle tube are pierced into the target sampling tissue 100, as shown in fig. 21 (a); firstly, the needle core 1 is triggered to pierce into the target sampling tissue 100, a part of the sampling groove (generally half the length of the full sampling groove) on the needle core 1 is exposed outside the needle tube 2, and the target sampling tissue 100 fills the part of the sampling groove, as shown in fig. 21 (b); when the needle tube 2 is fired again, the biopsy sample 302 is cut from the target tissue 100 by the needle tube 2 and stored in the sampling slot of the needle core, as shown in fig. 21(c), the length of the biopsy sample 302 is significantly shorter than that of the biopsy sample sampled in the full stroke in fig. 20(c), and different sampling amount requirements can be applied.

In this embodiment, the sampling stroke button 15 is connected to an elastic body 21 for returning the sampling stroke button 15 from the locked state to the unlocked state, a movable end of the elastic body 21 is connected to the sampling stroke button 15, and a fixed end of the elastic body 21 is connected to the mounting frame or the handle housing. The sampling stroke button 15 is provided with a positioning structure for positioning the sampling stroke button 15 in a locked state, and the positioning structure can be driven by the trigger link 13 to release the positioning, so that the sampling stroke button 15 can be driven by the elastic body 21 to return to an unlocked state from the locked state.

The elastic body has various forms, such as a spring, a spring plate, a rubber member, and the like. In this embodiment, as shown in fig. 6, the elastic body 21 is a V-shaped elastic sheet, the middle portion of the V-shaped elastic sheet is fixed on the sampling stroke button 15, and both ends of the V-shaped elastic sheet are clamped and fixed on the mounting frame. Therefore, the structure is simple, the return is reliable, and the installation is convenient.

In this embodiment, as shown in fig. 4 and 7, the positioning structure includes a first arm 152 and a second arm 155, fixed ends of the first arm 152 and the second arm 155 are fixedly connected to or integrally formed with one end of the sampling stroke button 15, a gap is left between the first arm 152 and the second arm 155, free ends of the first arm 152 and the second arm 155 can approach each other and elastically return, the second arm 155 is longer than the first arm 152, a first hook 153 is formed on one side of the free end of the first arm 152 away from the second arm 155, and the mounting frame is provided with a locking hole 221 for inserting the first arm 152 and the second arm 155; as shown in fig. 17 to 19, when the sampling stroke button 15 is in the locked state, the free ends of the first arm 152 and the second arm 155 each pass through the catch hole 221 and the first catch 153 on the first arm 152 catches with the catch hole 221 so as to position the sampling stroke button 15 in the locked state; during firing, the pushing portion 138 disposed at the front portion of the firing link 13 pushes the free end of the first arm 152, so that the first hook 153 is separated from the locking hole 221 on the mounting frame and is released from positioning, the sampling stroke button 15 is driven by the elastic restoring force of the elastic body 21 to return from the locked state to the unlocked state, and the free end of the first arm 152 exits from the locking hole 221. Therefore, the structure is simple and reasonable, the positioning is reliable, the unlocking is convenient, and the manufacturing cost is low.

In the present embodiment, the first arm 152 and the second arm 155 are disposed back and forth and the second arm 155 is located in front of the first arm 152. In other embodiments, the first arm 152 and the second arm 155 are disposed above and below each other and the second arm 155 is located above or below the first arm 152.

In this embodiment, the free end of the second arm 155 is provided with the second hook 156 on the side away from the first arm 152, so that the limit fit between the second hook 156 and the locking hole 221 can prevent the sampling stroke button 15 from being disengaged from the mounting frame, and the structure is reasonable and the assembly is convenient.

In this embodiment, the front end of the firing link 13 is further provided with a limiting portion 137, when the pushing portion 138 on the firing link 13 pushes the free end of the first arm 152, the pushing portion 138 and the limiting portion 137 are respectively located at the left and right sides of the clamping hole 221, so that the deviation of the front end of the firing link 13 caused by pushing action force can be avoided, the motion stability of the firing link 13 is improved, successful firing is ensured, and the service life is prolonged.

In this embodiment, the elastic body 21, and the first and second arms 152 and 155 are respectively located on the left and right sides of the hooking boss 151 and the escape groove 154. The fixed ends of the first arm 152 and the second arm 155 extend to the position of the escape groove 154. Therefore, the structure is stable, the locking is reliable, the positioning structure formed by the first arm 152 and the second arm 155 has better elasticity, and the service life is longer.

Further preferably, the sampling stroke button 15 is provided with a limit boss for limiting the first slider 6 to move backwards continuously behind the hooking boss 151, and a space for accommodating the hooking protrusion of the first elastic barb 61 is left between the limit boss and the hooking boss 151. Therefore, when the sampling stroke button 15 is in a locked state, the situation that the first sliding block 6 moves backwards and locks the first firing block 16 to be wound to cause non-stroke sampling failure and operation failure can be avoided.

In other embodiments, multiple sampling stroke buttons 15 may also be provided to accommodate taking biopsy specimens of different lengths.

When the biopsy device is not used, as shown in fig. 10, the first slider 6 and the second slider 10 are in an ungrained state, the sampling slot of the needle core 1 is accommodated in the needle tube 2, the safety button 12 locks the firing link 13, and the rear firing button 131 and the side firing button 17 cannot be pressed.

The winding-up firing process/method for the biopsy device full-stroke sampling comprises the following steps:

1) winding;

as shown in fig. 11 and 12, pressing the first and second winding-up buttons 14 and 19, respectively; the first string winding button 14 drives the first sliding block 6 to move backwards to compress the first firing spring 7 until the first elastic barb 61 on the first sliding block 6 is locked with the first firing block 16, and the first sliding block 6 and the needle tube 2 finish string winding; the second string feeding button 19 drives the second slider 10 to move backwards to compress the second firing spring 11 until the second elastic barb 101 on the second slider 10 is locked with the second firing block 23, and the second slider 10 and the stylet 1 complete string feeding; at this point, the safety button 12 preferably locks the firing link 13 to avoid false firings.

2) Opening the insurance;

as shown in FIG. 13, the safety button 12 is opened to unlock the firing link 13.

3) Percussion;

the rear firing button 131 is pressed or the side firing button 17 is pushed forwards to drive the firing connecting rod 13 to move forwards;

firstly, as shown in fig. 14, the firing link 13 drives the second firing block 23 to move downwards through the relative movement between the second chute lifting section 1331 in the second chute 133 and the second connecting rod 231 on the second firing block 23, so that the second firing block 23 and the second elastic barb 101 on the second slider 10 are unlocked, and the second slider 10 moves forwards under the pushing of the second firing spring 11, thereby completing the unlocking firing of the second slider 10 and the needle core 1; meanwhile, the firing link 13 keeps the first firing block 16 still by the relative movement of the first chute holding section 1361 in the first chute 136 and the first connecting column 161 on the first firing block 16, and maintains the locked state of the first firing block 16 and the first slider 6; thus, the sampling groove of the hub 1 is exposed to the distal end of the needle tube 2.

Then, as the trigger link 13 continues to move forward, as shown in fig. 15, the trigger link 13 drives the first trigger block 16 to move downward by the cooperation of the relative movement of the first chute lifting section 1362 in the first chute 136 and the first connecting post 161 on the first trigger block 16, so that the first trigger block 16 and the first elastic barb 61 on the first slider 6 are unlocked, the first slider 6 moves forward under the pushing of the first trigger spring 7, the unlocking trigger of the first slider 6 and the needle tube 2 is completed, and the needle tube 2 moves forward to take the sampling slot of the needle core 1 into the front end thereof; at the same time, the firing link 13 maintains the first firing block 16 stationary by the cooperation of the second chute retaining segment 1332 of its second chute 133 and the relative movement of the second attachment post 231 on the second firing block 23.

Finally, the rear firing button 131 and the side firing button 17 are released, as shown in fig. 16, the firing link 13 is pushed by the return spring 18 to move backward and reset, and the firing link 13 drives the first firing block 16 and the second firing block 23 to move upward and reset through the first sliding chute 136 and the second sliding chute 133, respectively.

The above-mentioned last string percussion process/method of biopsy device non-full stroke sampling includes the following steps:

1) adjusting the sampling stroke;

the sampling stroke button 15 is pushed, the sampling stroke button 15 enters a locking state from an unlocking state and is positioned in the locking state through the positioning structure, and at the moment, the hooking boss 151 on the sampling stroke button 15 is arranged on the front-back moving path of the first elastic barb 61 of the first sliding block 6.

2) Winding;

pressing the first and second winding-up buttons 14 and 19, respectively; the first string winding button 14 drives the first sliding block 6 to move backwards to compress the first firing spring 7 until the first elastic barb 61 on the first sliding block 6 is locked with the hooking boss 151 on the sampling stroke button 15, and the first sliding block 6 and the needle tube 2 finish string winding as shown in fig. 17; the second string feeding button 19 drives the second slider 10 to move backwards to compress the second firing spring 11 until the second elastic barb 101 on the second slider 10 is locked with the second firing block 23, and the second slider 10 and the stylet 1 complete string feeding; at this point, the safety button 12 preferably locks the firing link 13 to avoid false firings.

3) Opening the insurance;

the safety button 12 is opened to release the locking of the firing link 13.

4) Percussion;

the rear firing button 131 is pressed or the side firing button 17 is pushed forwards to drive the firing connecting rod 13 to move forwards;

firstly, the firing connecting rod 13 drives the second firing block 23 to move downwards through the relative movement and matching of the second chute lifting section 1331 in the second chute 133 and the second connecting column 231 on the second firing block 23, so that the second firing block 23 and the second elastic barb 101 on the second slider 10 are unlocked, the second slider 10 moves forwards under the pushing of the second firing spring 11, and the unlocking firing of the second slider 10 and the needle core 1 is completed; at this time, the sampling stroke button 15 is kept locked, and a part of the sampling groove of the core 1 is exposed to the tip of the needle tube 2.

Then, as the trigger link 13 continues to move forward, the pushing part 138 at the front end of the trigger link 13 unlocks the positioning structure of the sampling stroke button 15, the sampling stroke button 15 returns to the unlocking state from the locking state under the driving of the return elastic force of the elastic body 21, the hooking boss 151 of the sampling stroke button 15 and the first elastic barb 61 of the first slider 6 are unlocked, the first slider 6 moves forward under the driving of the first trigger spring 7, the unlocking trigger of the first slider 6 and the needle tube 2 is completed, and the needle tube 2 moves forward to take the sampling groove of the needle core 1 into the front end of the needle core; at the same time, the firing link 13 maintains the first firing block 16 stationary by the cooperation of the second chute retaining segment 1332 of its second chute 133 and the relative movement of the second attachment post 231 on the second firing block 23.

Finally, the rear firing button 131 and the side firing button 17 are released, the firing link 13 moves backwards and returns under the pushing of the return spring 18, and the firing link 13 drives the first firing block 16 and the second firing block 23 to move upwards and return through the first sliding chute 136 and the second sliding chute 133 respectively.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The sampling stroke adjusting mechanism of the biopsy device is characterized by comprising a sampling stroke button (15), wherein the sampling stroke button (15) is provided with a hooking boss (151) and an avoiding groove (154), and the hooking boss (151) or the avoiding groove (154) can be arranged on a front-back movement path of a first elastic barb (61) on a first sliding block (6) by moving the sampling stroke button (15); when the sampling stroke button (15) is in a locked state, and the hooking boss (151) is arranged on a forward and backward movement path of the first elastic barb (61), the first elastic barb (61) can be hooked and positioned with the hooking boss (151) to realize winding locking, and when the first sliding block (6) is locked at the position, only part of a sampling groove of the needle core (1) can be exposed out of the needle tube (2) to realize non-full-stroke sampling; when the sampling stroke button (15) is in an unlocking state, the first elastic barb (61) can freely pass through without obstruction when the avoidance groove (154) is arranged on the forward and backward movement path of the first elastic barb (61).

2. The sampling stroke adjusting mechanism of the biopsy device according to claim 1, wherein an elastic body (21) for returning the sampling stroke button (15) from the locked state to the unlocked state is connected to the sampling stroke button (15), a movable end of the elastic body (21) is connected to the sampling stroke button (15), a fixed end of the elastic body (21) is connected to the mounting frame or the handle housing, a positioning structure for positioning the sampling stroke button (15) in the locked state is arranged on the sampling stroke button (15), and the positioning structure can be driven by the trigger link (13) to be released from positioning, so that the sampling stroke button (15) can be returned from the locked state to the unlocked state under the driving of the elastic body (21).

3. The sampling stroke adjusting mechanism of the biopsy device according to claim 2, wherein the elastic body (21) is a V-shaped elastic sheet, the middle part of the V-shaped elastic sheet is fixed on the sampling stroke button (15), and two ends of the V-shaped elastic sheet are arranged on the mounting frame.

4. The sampling stroke adjusting mechanism of a biopsy device according to claim 2, wherein the positioning structure comprises a first arm (152) and a second arm (155), fixed ends of the first arm (152) and the second arm (155) are fixedly connected with or integrally formed with one end of the sampling stroke button (15), a gap is left between the first arm (152) and the second arm (155), free ends of the first arm (152) and the second arm (155) can approach each other and elastically return, the second arm (155) is longer than the first arm (152), a first hook (153) is formed on one side of the free end of the first arm (152) far away from the second arm (155), and the mounting frame is provided with a clamping hole (221) for inserting the first arm (152) and the second arm (155); when the sampling stroke button (15) is in a locking state, the free ends of the first arm (152) and the second arm (155) penetrate through the clamping hole (221) and the first clamping hook (153) on the first arm (152) is clamped with the clamping hole (221) so as to position the sampling stroke button (15) in the locking state; when the sampling device is used for triggering, the pushing part (138) arranged at the front part of the triggering connecting rod (13) pushes the free end of the first arm (152) to enable the first hook (153) to be separated from the clamping hole (221) on the mounting frame and to be released from positioning, so that the sampling stroke button (15) is restored to the unlocking state from the locking state under the driving of the restoring elasticity of the elastic body (21), and the free end of the first arm (152) is withdrawn from the clamping hole (221).

5. The sampling stroke adjusting mechanism of a biopsy device according to claim 4, wherein the first arm (152) and the second arm (155) are arranged back and forth and the second arm (155) is located in front of the first arm (152).

6. The sampling stroke adjusting mechanism of the biopsy device according to claim 4, wherein the free end of the second arm (155) is provided with a second hook (156) at a side away from the first arm (152), and the sampling stroke button (15) is prevented from being removed from the mounting frame by the limit fit of the second hook (156) and the locking hole (221) on the mounting frame.

7. The sampling stroke adjusting mechanism of a biopsy device according to claim 2, wherein the elastic body (21) and the first arm (152) and the second arm (155) are respectively located at the left and right sides of the hooking boss (151) and the escape groove (154), and fixed ends of the first arm (152) and the second arm (155) extend to the position of the escape groove (154).

8. The sampling stroke adjusting mechanism of a biopsy device according to claim 1, wherein the sampling stroke button (15) is provided with a limit boss for limiting the first slider (6) to move backwards continuously behind the hooking boss (151), and a space for accommodating the hooking boss of the first elastic barb (61) is left between the limit boss and the hooking boss (151).

9. A biopsy device, comprising the sampling stroke adjusting mechanism of the biopsy device according to any one of claims 1 to 8, further comprising a mounting frame, wherein the mounting frame is provided with a first slider (6), a first firing spring (7), a first firing block (16), a second slider (10), a second firing spring (11), a second firing block (23) and a firing connecting rod (13), and the first slider (6) and the second slider (10) are respectively connected with the mounting frame in a front-back sliding manner and are arranged in a front-back sliding manner; the first sliding block (6) is fixedly connected with the rear end of the needle tube (2), the front end of the first firing spring (7) abuts against the first sliding block (6), the rear end of the first firing spring (7) abuts against the installation frame, a first elastic barb (61) is arranged on the first sliding block (6), and the first sliding block (6) moves backwards in place and is locked by hooking the first elastic barb (61); the second sliding block (10) is fixedly connected with the rear end of the needle core (1), the front end of a second trigger spring (11) abuts against the second sliding block (10), the rear end of the second trigger spring (11) abuts against the installation frame, a second elastic barb (101) is arranged on the second sliding block (10), and the second sliding block (10) moves backwards in place and is locked by the hook of the second elastic barb (101); the trigger connecting rod (13) is arranged on the mounting frame and can move back and forth, the trigger connecting rod (13) is movably connected with the first trigger block (16) and can drive the first trigger block (16) to enable the first sliding block (6) to be unlocked, the trigger connecting rod (13) is movably connected with the second trigger block (23) and can drive the second trigger block (23) to enable the second sliding block (10) to be unlocked, and the front end of the trigger connecting rod (13) is provided with a pushing part (138) used for pushing the sampling stroke button (15).

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