CN113768550B

CN113768550B - Biopsy needle device and single-time loading firing mechanism thereof

Info

Publication number: CN113768550B
Application number: CN202111095913.2A
Authority: CN
Inventors: 王珏
Original assignee: Delin Medical Technology Wuhan Co ltd
Current assignee: Delin Medical Technology Wuhan Co ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2023-09-15
Anticipated expiration: 2041-09-18
Also published as: CN113768550A

Abstract

The application relates to a single-time loading firing mechanism of a biopsy needle device, which comprises a first fitting, a second fitting and a third fitting, wherein the first fitting, the second fitting and the third fitting are respectively and correspondingly fixed with the rear ends of a needle core, a needle sleeve and a steel sheet, the second fitting is connected to the first fitting in a sliding way, the third fitting is connected to the second fitting in a sliding way, the single-time loading firing mechanism also comprises a firing seat and an unlocking push plate, the firing seat is arranged in a shell and can slide back and forth, the firing seat is provided with a clamping block matched with the clamping block, the top of the firing seat is provided with a limit connection structure matched with the second fitting and the third fitting, the firing seat is connected with a firing spring in the shell, when the firing seat is pulled back to the clamping block to be clamped with the clamping block, the firing seat drives the second fitting and the third fitting to finish loading the needle sleeve and the steel sheet, and when the unlocking push plate is pushed forward to the clamping block to be out of the clamping block to drive the second fitting and the third fitting to finish the firing of the needle sleeve and the steel sheet. The application can realize the loading of the needle sleeve and the steel sheet by single back pulling and can realize the firing sampling of the needle sleeve and the steel sheet by single triggering.

Description

Biopsy needle device and single-time loading firing mechanism thereof

Technical Field

The application belongs to the field of medical instruments, and relates to living body sampling, in particular to a biopsy needle device and a single-time loading firing mechanism thereof.

Background

The biopsy device is a medical instrument, and is suitable for biopsy sampling, cell sucking and the like of various organs such as liver, kidney, lung, prostate, mammary gland, thyroid gland and the like. The conventional biopsy device generally comprises a biopsy needle component and a firing mechanism, wherein a sampling groove is arranged on the side wall of a needle core, the needle core is firstly fired and inserted into a biopsy to be sampled once during sampling, and then tissue is cut and reserved in the sampling groove by a cutting cannula sleeved outside the needle core for secondary firing and inserting. The defects are that: the sample is long thin strip form and can't fill up the sample recess usually, and once the sample volume is few, when the sample volume is great needs, needs puncture repeatedly the sample, and risk and wound all increase. In order to overcome the above disadvantages, the applicant has devised a biopsy needle (see CN106344077a in particular) for taking samples by using a cylindrical sampling groove axially provided at the distal end of the outer sleeve of the core in combination with a steel sheet having a tissue cutting function, wherein the sampling is in a long cylindrical shape, the sampling amount is greatly increased, and the reduction of the sampling times is facilitated. However, the outer sleeve and the steel sheet of the puncture biopsy needle are respectively required to be driven by a firing mechanism, and the respective firing strokes are different, and the firing mechanism of the puncture biopsy needle is usually also a firing mechanism for sampling by twice feeding (respectively feeding the outer sleeve and the steel sheet) and twice firing (pressing a firing button twice), and the lack of single pressing of the firing button.

Disclosure of Invention

The application aims to solve the technical problem of providing a biopsy needle device and a single firing mechanism thereof, and aims to overcome the defects in the prior art.

The technical scheme for solving the technical problems is as follows: the utility model provides a single-time loading firing mechanism of biopsy needle device, includes first accessory, second accessory and the third accessory that corresponds respectively with the rear end of needle core, needle cover and steel sheet is fixed, one side of first accessory is equipped with and is used for sliding connection the connecting plate of second accessory, third accessory sliding connection in on the second accessory, it still includes the firing seat and unblock push pedal, but the firing seat locates in the casing and the back-and-forth sliding, the firing seat has the block tongue, be equipped with on the shells inner wall with block tongue complex fixture block, the firing seat top be equipped with second accessory and third accessory complex limit connection structure, the firing seat with firing spring in the casing is connected, and the back draws the firing seat to the block tongue with when the fixture block joint, the firing spring is accomplished the potential energy and is accumulated and the firing seat drives second accessory and third accessory is to the upper chamber of needle cover and steel sheet, before the push pedal to the block tongue and block tongue when the block joint, the firing seat has been lost, the firing spring has been passed forward the firing seat and has been accomplished the firing seat and has been released the firing accessory.

On the basis of the technical scheme, the application can be improved as follows.

Further, the limit connecting structure comprises a boss, a pull groove, a first convex column and a second convex column, the rear end of the first fitting is covered on a fixed seat in the shell, the connecting plate extends in the front-back direction and is parallel to and close to one side surface of the firing seat, the boss is positioned on one side of the top surface of the firing seat close to the connecting plate, the pull groove is formed in the other side of the top surface of the boss, a first downward extending plate and a second downward extending plate are respectively fixed on the left side and the right side of the bottom of the second fitting, the second fitting covers the top surface of the firing seat, the rear side of the bottom edge of the first downward extending plate extends downwards to be clamped into a pull block of the pull groove, the rear side of the top edge of the first downward extending plate extends outwards to form an L-shaped connecting lug, the bottom of one side of the second downward extending plate far away from the first downward extending plate extends outwards to form a first boss, the upper part extends outwards to form a stop block, the connecting plate bottom surface and top surface are equipped with first spout and second spout respectively, first spout with first protruding sliding fit, the dog with connecting plate top surface one side butt, second accessory top surface be equipped with the second arch of back-and-forth extension and with the third spout cooperation of third accessory bottom surface, be equipped with on the third accessory confession first projection passes the broaching just press from both sides between the rear end of third accessory and the second projection has the movable block, third accessory one side still be equipped with engaging lug complex hanging hook plate, the top of second projection with the operation portion that gives up on the casing is connected, the movable block can follow the second spout slides back and forth and receive the second spout effect and follow the left and right directions and remove in order to be close to or keep away from the bellied back end face of second.

The advantage of adopting above-mentioned further institutional advancement is, pass the first projection of broaching first drive the third accessory of pull hole and move backward when drawing the firing seat afterwards and make the steel sheet front end withdraw in the needle cover, the steel sheet is accomplished to the rubberizing in the needle cover, in this process, because the front end couple of hooking plate has not contacted with L shape engaging lug behind one side top of second accessory, simultaneously the pull block of second accessory homonymy bottom first stretching plate rear end still has not contacted with the draw groove front end wall yet, so second accessory keeps original position unchanged, firing seat continues the back to move and then engaging lug and couple plate contact, pull block and draw groove front end wall also contact, continue the back to draw then second accessory and third accessory synchronous backward to remove until the latch and the fixture block of firing seat, the rubberizing is also accomplished exactly to the latch and fixture block at this moment, accomplish the rubberizing of steel sheet and needle cover promptly after once promptly, accomplish the rubberizing of steel sheet and needle cover promptly, it is convenient high-efficient.

Further, the rear end of the third accessory is provided with a third bulge and the third bulge is sleeved with the movable block, one end of the movable block is provided with a fourth bulge which protrudes downwards and is in sliding fit with the second chute, the second chute is formed by connecting a front section, a middle section and a rear end, the groove widths of the front section and the rear section are the same and are smaller than those of the middle section, the front section and the rear section are parallel and are closer to the second bulge than the front section in the left-right direction, the groove walls of the joints of the middle section and the front section and the rear section are provided with transition inclined planes, and the fourth bulge is in front-back sliding in the second chute and passes through the middle section, and the transition inclined planes can drive the movable block to slide left-right relative to the third bulge so as to be close to or far away from the rear extension end face of the second bulge.

The advantage of adopting above-mentioned further institutional advancement is, the spout sets up to preceding, well, back three-section, establish the transition inclined plane between the adjacent two-section, thereby realize that the movable block receives the pushing or drawing of transition inclined plane when following the second spout and remove, thereby realize being close to or keep away from the bellied back extension terminal surface of second, mainly realize earlier that the synchronous forward pushing of second and third accessory fires the needle cover (the movable block is close to and pastes tightly with the bellied back extension terminal surface of second this moment, the second projection supports the movable block and promotes second accessory and third accessory and advance in step until the front end of second accessory contacts with the inboard front wall of casing, realize that the needle cover dashes forward and fires and make the tissue sample get into needle cover front end) and last stage singly to the forward pushing firing of third accessory (because the transition inclined plane of front end has just made the movable block break away from the back extension terminal surface to the promotion effect of movable block at this stage, so the movable block can not produce the impel to the second accessory, thereby guarantee that the firing seat still can advance a little section under the effect of firing spring, first projection and promote the second projection and promote the synchronous forward of third accessory and cut off the needle cover when advancing this little section, realize that the cylindrical sample stretches out of the needle cover.

Further, the back end surface of the firing seat and the front end surface of the fixing seat are correspondingly provided with circular limiting grooves, and the front end and the back end of the firing spring respectively extend into the corresponding circular limiting grooves.

The advantage of adopting above-mentioned further institutional advancement is, it is better to the location effect of firing spring, guarantees that spring compression or when firing do not produce the aversion distortion as far as possible, guarantees better loading and firing effect.

Further, the operation portion of the loading includes a loading pull button and a first reset spring, an inner chute extending back and forth is arranged on the shell, the loading pull button is slidably connected in the inner chute, a bayonet for the second convex column to insert and fix is arranged at the bottom of the loading pull button, the first reset spring is further arranged in the inner chute, one end of the first reset spring is connected with the loading pull button, and the other end of the first reset spring is connected with the inner side wall of the front end of the shell.

The advantage of adopting above-mentioned further institutional advancement is, first reset spring can be at the back of finishing of the rubberizing, rubberizing pull button automatic re-setting.

Further, the unblock push pedal includes the frame and is fixed in the tongue board of frame bottom, the tongue board front end sets up into the inclined plane, the frame middle part is equipped with the diaphragm, the diaphragm preceding terminal surface with press from both sides between the terminal surface behind the fixing base and be equipped with second reset spring, the frame bottom still is equipped with the limiting plate, be fixed with on the casing diapire with the locating piece of terminal surface butt behind the limiting plate.

The advantage of adopting above-mentioned further institutional advancement is, and the second reset spring can make the unblock push pedal accomplish the automatic re-setting after the unblock action, avoids influencing next time to load.

Further, a firing button is arranged on the shell, and the firing button is arranged on the side wall and/or the rear wall of the shell and can drive the unlocking push plate to move forward when being pressed.

The advantage of adopting above-mentioned further institutional advancement is, conveniently press the percussion.

Further, the firing buttons are two, namely a back firing button and a side firing button, the back firing button is fixedly connected with the rear end of the outer frame and extends out of the rear end of the shell, a clamping groove is formed in the side wall of the outer frame, and the side firing button is rotatably connected to the side wall of the shell and is provided with a clamping joint extending into the clamping groove of the side wall of the outer frame.

The side firing and the back firing can be realized independently, and the side firing and the back firing are convenient to use.

Further, the firing seat and the unlocking push plate are both made of hard plastic.

The improved structure has the advantages of easy material acquisition, light weight and relatively low noise during firing.

The application also provides a biopsy needle device which is provided with the single-time loading firing mechanism.

Compared with the prior art, the application has the beneficial effects that:

the structure of the firing seat, the second accessory, the third accessory and the like is specially designed to realize that the second accessory and the third accessory can finish the loading of the needle sleeve and the steel sheet respectively through single back-pulling of the firing seat, the locking part only has the clamping tongue and the clamping block which are matched with each other, the loading is finished through one back-pulling and is in a to-be-fired use state, and when the device is used, the sampling can be fired and sampled once only by pressing the firing button, so that the device is very convenient to use, the defects of troublesome operation, increased sampling risk and the like caused by the loading and/or the firing twice in the last time are avoided, and the sampling efficiency and the safety are greatly improved; is beneficial to realizing single-hand feeding and firing and overcomes the defects of double-hand operation.

Drawings

FIG. 1 is an isometric view of a biopsy needle device provided by the present application;

FIG. 2 is a schematic view of the internal structure of the biopsy needle device of FIG. 1 with the outer housing removed;

FIG. 3 is a front view of the internal structure of FIG. 2;

FIG. 4 is a top view of the internal structure of FIG. 2;

FIG. 5 is a schematic view of the internal structure of FIG. 2 after the unlocking push plate, the firing seat and the fixing seat are assembled;

FIG. 6 is a top view of the assembled structure of FIG. 5;

FIG. 7 is an isometric view of an assembled structure of the core, sleeve, steel sheet and first through third fittings;

FIG. 8 is a top view of the assembled structure of FIG. 7;

FIG. 9 is an enlarged schematic view of the first through third fittings (showing a portion of the needle) in the assembled configuration of FIG. 7;

FIG. 10 is an exploded view of the assembled structure of FIG. 7;

FIG. 11 is an enlarged schematic view of the first through third fittings of FIG. 10;

FIG. 12 is a front view of the firing seat;

FIG. 13 is a top view of the firing seat;

FIG. 14 is an isometric view of a firing seat;

FIG. 15 is an isometric view of an unlocking push plate;

fig. 16 is a top view of an unlocking push plate.

In the drawings, the list of components represented by the various numbers is as follows:

1. a needle core; 2. a needle sleeve; 3. a steel sheet; 4. a first fitting; 5. a second fitting; 6. a third fitting; 7. a firing seat; 8. unlocking the push plate; 9. a housing; 10. a firing spring;

401. a connecting plate; 4011. a first chute; 4012. a second chute; 4013. a transition inclined plane;

501. a first downward extending plate; 502. a second downward extending plate; 503. a stop block; 504. a second protrusion; 505. a rear extension end surface; 5011. a connecting lug;

601. pulling holes; 602. a movable block; 603. a third protrusion; 604. a hook plate; 6021. a fourth protrusion;

701. a clamping tongue; 702. a boss; 703. drawing a groove; 704. a first post; 705. a second post; 706. a circular limit groove;

801. a tongue plate; 802. a cross plate; 803. a second return spring;

901. a fixing seat; 902. a pull button is arranged in the upper chamber; 903. an inner chute; 904. a first return spring; 905. a firing button.

Detailed Description

The principles and features of the present application are described below with reference to the drawings and specific embodiments, the examples being provided for illustration only and not for the purpose of limiting the application.

In the description of the present application, if terms indicating orientations such as "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. are used, the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the indicated devices or elements must have a specific orientation, be configured and operated in the specific orientation, and thus are not to be construed as limiting the present application.

As shown in fig. 1 to 16, the application provides a single-time loading firing mechanism of a biopsy needle device, which comprises a first fitting 4, a second fitting 5 and a third fitting 6 which are respectively corresponding to and fixed with the rear ends of a needle core 1, a needle sleeve 2 and a steel sheet 3, wherein one side of the first fitting 4 is provided with a connecting plate 401 for sliding connection with the second fitting 5, the third fitting 6 is slidably connected with the second fitting 5, the single-time loading firing mechanism further comprises a firing seat 7 and an unlocking push plate 8, the firing seat 7 is arranged in a shell 9 and can slide back and forth, the firing seat 7 is provided with a clamping tongue 701, a limit connection structure matched with the clamping tongue 701 is arranged on the inner wall of the shell 9, the top of the firing seat 7 is provided with a limit connection structure matched with the second fitting 5 and the third fitting 6, the firing seat 7 is connected with a firing spring 10 in the shell 9, when the clamping tongue is pulled back to the clamping block, the third fitting 6 is slidably connected with the second fitting 5, the firing seat 10 completes potential energy, the firing seat 7 drives the second fitting 5 and the steel sheet 5 to be completely triggered, the firing seat 7 is completely and the firing seat 5 is completely and the clamping steel sheet is completely and the clamping seat is completely released from the clamping tongue 7 and the third fitting 6 is completely and the firing seat 2 is completely triggered, and the clamping seat is completely triggered, and is completely triggered to the clamping seat 6 and is completely is matched with the clamping fitting 6 and 3 fitting 6 and has a clamping seat 6 is completely 3 is completely matched with the clamping plate 6.

The single-time loading firing mechanism of the biopsy needle device provided by the application has the advantages that once the single-time loading firing mechanism is pulled to clamp the clamping tongue and the clamping block, the loading of the needle sleeve and the steel sheet is smoothly completed, namely, once loading is realized, when the unlocking push plate is pushed forward to unlock the clamping tongue and the clamping block, the firing spring pushes the firing seat to move forward, the needle sleeve is firstly fired and then the steel sheet is fired, the front end of the needle sleeve is moved forward beyond the front end of the needle core to enable a tissue sample to enter the inner cavity of the front end of the needle sleeve, and the pre-bent front end of the steel sheet which is fired later cuts the tissue sample when the front end of the needle sleeve extends out, so that a cylindrical sample is trapped in the needle sleeve, and the sampling is completed. The biopsy needle assembly with the needle sleeve, the needle core and the steel sheet structure can refer to the prior application patent CN201610863433 of the applicant, and corresponding accessories for connecting the needle sleeve and the steel sheet are improved to realize the functions of single loading and single firing.

When sampling, the trigger seat is pulled to a clamping state of the clamping tongue and the clamping block successively, the needle sleeve and the steel sheet are in the state, the needle sleeve and the steel sheet are loaded, the sharp part at the front end of the needle core extends out of the front end of the needle sleeve, the front end of the needle core is aligned to the sampling part during sampling, the shell is held (the trigger button on the shell is avoided) to push forward to puncture into tissues, after reaching a specified depth (the X-ray film is matched and judged), the trigger button is pressed, the unlocking push plate is moved forward to disconnect the clamping tongue from the clamping block, the trigger spring pushes the trigger seat to move forward, the needle sleeve and the steel sheet are sequentially triggered, a cylindrical sample is trapped in the front end of the needle sleeve, the needle sleeve is pulled out of tissues, then the steel sheet is retracted into the steel sheet interlayer cavity of the needle sleeve firstly after the action of repeating the loading, the needle sleeve is opened, the needle sleeve is retracted, and the needle core ejects the cylindrical tissues taken down from the front end opening of the needle sleeve.

In one embodiment of the present application, as shown in fig. 7 to 14, the limiting connection structure includes a boss 702, a pull groove 703, a first boss 704 and a second boss 705, the rear end of the first fitting 4 is covered on the fixing seat 901 in the housing 9, the connecting plate 401 extends in the front-back direction and is parallel to and close to one side surface of the firing seat 7, the boss 702 is located on one side of the top surface of the firing seat 7 near the connecting plate 401, the pull groove 703 is opened on the other side of the top surface of the boss 702, a first downward extending plate 501 and a second downward extending plate 502 are respectively fixed on the left and right sides of the bottom of the second fitting 5, the second fitting 5 is covered on the top surface of the firing seat 7, a pull block clamped in the pull groove 703 extends downward from the rear side of the bottom edge of the first downward extending plate 501, an L-shaped connecting lug 5011 extends outward from the rear side of the top edge of the first downward extending plate 501, the bottom of one side of the second downward extending plate 502 far away from the first downward extending plate 501 is outwards extended with a first bulge, the upper part is outwards extended with a stop block 503, the bottom surface and the top surface of the connecting plate 401 are respectively provided with a first chute 4011 and a second chute 4012, the first chute 4011 is in sliding fit with the first bulge, the stop block 503 is abutted with one side of the top surface of the connecting plate 401, the top surface of the second fitting 5 is provided with a second bulge 504 which extends forwards and backwards and is matched with a third chute on the bottom surface of the third fitting 6, the third fitting 6 is provided with a pulling hole 601 for the first protruding column 704 to pass through, a movable block 602 is clamped between the rear end of the third fitting 6 and the second protruding column 705, one side of the third fitting 6 is also provided with a hook plate 604 matched with the connecting lug 5011, the top end of the second protruding column 705 is connected with a loading operation part outside the shell 9, the movable block 602 can slide back and forth along the second chute 4012 and is moved in the left-right direction by the second chute 4012 during the sliding process to approach or separate from the rear extension end surface 505 of the second protrusion 504.

It should be noted that, the fixing base is fixed on the casing, and the unblock push pedal and the percussion seat are all can relative the casing is slided in the fore-and-aft direction, and the effect of unblock push pedal is mainly for making the block break away from the fixture block, and the effect of percussion seat is then for realizing the loading and the percussion of needle cover and steel sheet.

In an embodiment of the present application, a third protrusion 603 is disposed at a rear end of the third fitting 6, the movable block 602 is sleeved on the third protrusion 603, a fourth protrusion 6021 protruding downward and slidably engaged with the second chute 4012 is disposed at one end of the movable block 602, the second chute 4012 is formed by connecting a front section, a middle section and a rear end, wherein the front section and the rear section have the same groove width and are narrower than the middle section, the front section and the rear section are parallel and are closer to the second protrusion 504 than the front section in a left-right direction, a groove wall at a connection position between the middle section and the front section and the rear section is provided with a transition slope 4013, and when the fourth protrusion 6021 slides back and forth in the second chute 4012 through the middle section, the transition slope 4013 can drive the movable block 602 to slide left and right relative to the third protrusion 603 so as to approach or separate from the second protrusion 504.

It should be noted that, the thickness of the fourth protrusion in the left-right direction is equivalent to the groove widths of the front section and the rear section, the middle section is wider, the front, middle and rear adjacent sections are connected through the transition inclined surface section, the fourth protrusion is pushed to the left at the transition inclined surface at the rear during loading, specifically, the movable block moves to the left to be close to the second protrusion, the front side of the movable block is abutted to the rear extension end surface 505 of the second protrusion, the movable block moves to the right to be separated from the rear extension end surface at the transition inclined surface at the front during firing, and the second protrusion moves forward to be blocked by the second protrusion of the second accessory when the movable block is lost forward after separation.

In one embodiment of the present application, as shown in fig. 14, a circular limiting groove 706 is correspondingly formed on the rear end surface of the firing seat 7 and the front end surface of the fixing seat 901, and the front end and the rear end of the firing spring 10 respectively extend into the corresponding circular limiting groove 706.

In one embodiment of the present application, as shown in fig. 2 to 6, the loading operation portion includes a loading knob 902 and a first return spring 904, an inner sliding groove 903 extending back and forth is provided on the housing 9, the loading knob 902 is slidably connected in the inner sliding groove 903, a bayonet for inserting and fixing the second boss 705 is provided at the bottom of the loading knob 902, the first return spring 904 is further provided in the inner sliding groove 903, one end of the first return spring 904 is connected with the loading knob 902, and the other end is connected with the inner side wall at the front end of the housing 9.

It should be noted that, be equipped with a clamp plate that opens the spout between the upper wall of casing inner chamber and the top surface of first, second and third accessory, each accessory is sprung upward when avoiding loading or firing.

In one embodiment of the present application, as shown in fig. 15 and 16, the unlocking push plate 8 includes an outer frame and a tongue plate 801 fixed at the bottom of the outer frame, the front end of the tongue plate 801 is configured as an inclined plane, a cross plate 802 is disposed in the middle of the outer frame, a second return spring 803 is sandwiched between the front end surface of the cross plate 802 and the rear end surface of the fixing seat 901, a limiting plate is further disposed at the bottom of the outer frame, and a positioning block abutting against the rear end surface of the limiting plate is fixed on the bottom wall of the housing 9.

In one embodiment of the present application, a firing button 905 is disposed on the housing 9, and the firing button 905 is disposed on a side wall and/or a rear wall of the housing 9 and can drive the unlocking push plate 8 to move forward when being pressed.

In one embodiment of the present application, the two firing buttons 905 are respectively a back firing button and a side firing button, the back firing button is fixedly connected with the back end of the outer frame and extends out from the back end of the housing 9, a clamping groove is formed on the side wall of the outer frame, and the side firing button is rotatably connected to the side wall of the housing 9 and has a clamping joint extending into the clamping groove of the side wall of the outer frame.

In one embodiment of the present application, the firing block 7 and unlocking plate 8 are both made of rigid plastic.

The foregoing description of the preferred embodiments of the application is not intended to limit the application to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the application are intended to be included within the scope of the application.

Claims

1. The utility model provides a single-time loading firing mechanism of biopsy needle device, includes first accessory (4), second accessory (5) and third accessory (6) that correspond respectively with the rear end of needle core (1), needle cover (2) and steel sheet (3) fixed, one side of first accessory (4) is equipped with and is used for sliding connection connecting plate (401) of second accessory (5), third accessory (6) sliding connection in on second accessory (5), characterized by still includes firing seat (7) and unlocking push pedal (8), firing seat (7) are located in casing (9) and can slide fore-and-aft, firing seat (7) have block tongue (701), be equipped with on casing (9) inner wall with block tongue (701) complex spacing connection structure, firing seat (7) with firing spring (10) in casing (9) are connected, firing seat (7) are to after-mentioned block tongue (7) and third accessory (6) finish firing seat (7) and stop tongue (701) complex fixture block, firing seat (7) and finish when finishing firing seat (7) and third accessory (6), when the unlocking push plate (8) is pushed forward until the clamping tongue (701) and the clamping block lose clamping connection, the potential energy of the firing spring (10) is released to enable the firing seat (7) to emit forward, and the firing seat (7) drives the second accessory (5) and the third accessory (6) to complete firing of the needle sleeve (2) and the steel sheet (3);

the limit connection structure comprises a boss (702), a pull groove (703), a first protruding column (704) and a second protruding column (705), wherein the rear end of a first fitting (4) is covered on a fixed seat (901) in a shell (9), the connecting plate (401) extends in the front-back direction and is parallel to and close to one side surface of the pull groove (7), the boss (702) is positioned on one side, close to the connecting plate (401), of the top surface of the firing seat (7), the pull groove (703) is formed in the other side of the top surface of the boss (702), a first downward extending plate (501) and a second downward extending plate (502) are respectively fixed on the left side and the right side of the bottom of the second fitting (5), the second fitting (5) is covered on the top surface of the firing seat (7), a pull block clamped into the pull groove (703) is downwards extended in the rear side of the bottom edge of the first downward extending plate (501), an L-shaped connecting plate (5011) is outwards extended in the rear side of the top edge of the firing seat (7), the second downward extending plate (502) is far away from the first downward extending plate (501) and is provided with a first sliding groove (401) and a sliding groove (401), the first downward extending plate (401) is respectively extended towards the bottom surface (401), the stopper (503) with connecting plate (401) top surface one side butt, second accessory (5) top surface be equipped with around extension second arch (504) and with the cooperation of third spout of third accessory (6) bottom surface, be equipped with on third accessory (6) confession first projection (704) pass draw hole (601) just press from both sides between the rear end of third accessory (6) and second projection (705) movable block (602), third accessory (6) one side still be equipped with link (5011) complex hooking plate (604), the top of second projection (705) with the operation portion of painting on casing (9) is connected, movable block (602) can follow second spout (4012) back and forth slip and receive second spout (4012) effect and along left and right directions and move in order to be close to or keep away from second protruding (504) back terminal surface (505).

2. The single-shot loading firing mechanism of a biopsy needle device according to claim 1, wherein a third protrusion (603) is arranged at the rear end of the third fitting (6) and the movable block (602) is sleeved on the third protrusion (603), a fourth protrusion (6021) protruding downwards and slidingly matched with the second sliding groove (4012) is arranged at one end of the movable block (602), the second sliding groove (4012) is formed by connecting a front section, a middle section and a rear end, the groove widths of the front section and the rear section are the same and are smaller than those of the middle section, the front section and the rear section are parallel and are closer to the second protrusion (504) than the front section in the left-right direction, a transition inclined plane (4013) is arranged at the groove wall at the joint of the middle section and the front section and the rear section, and the transition inclined plane (4013) can drive the movable block (602) to slide forwards and backwards in the second sliding groove (4012) to be relatively far away from the third protrusion (603).

3. The single-loading firing mechanism of a biopsy needle device according to claim 1, wherein a circular limit groove (706) is correspondingly formed on the rear end surface of the firing seat (7) and the front end surface of the fixing seat (901), and the front end and the rear end of the firing spring (10) respectively extend into the corresponding circular limit groove (706).

4. The single-time loading firing mechanism of a biopsy needle device according to claim 1, wherein the loading operation part comprises a loading pull button (902) and a first reset spring (904), an inner sliding groove (903) extending forwards and backwards is arranged on the shell (9), the loading pull button (902) is slidably connected in the inner sliding groove (903), a bayonet for inserting and fixing the second convex column (705) is arranged at the bottom of the loading pull button (902), the first reset spring (904) is further arranged in the inner sliding groove (903), one end of the first reset spring (904) is connected with the loading pull button (902), and the other end of the first reset spring (904) is connected with the inner side wall of the front end of the shell (9).

5. The single-shot loading firing mechanism of a biopsy needle device according to claim 1, wherein the unlocking push plate (8) comprises an outer frame and a tongue plate (801) fixed at the bottom of the outer frame, the front end of the tongue plate (801) is set to be an inclined plane, a transverse plate (802) is arranged in the middle of the outer frame, a second reset spring (803) is clamped between the front end face of the transverse plate (802) and the rear end face of the fixed seat (901), a limiting plate is further arranged at the bottom of the outer frame, and a positioning block abutted to the rear end face of the limiting plate is fixed on the bottom wall of the shell (9).

6. The single-load firing mechanism of a biopsy needle device according to claim 5, wherein a firing button (905) is provided on the housing (9), and the firing button (905) is provided on a side wall and/or a rear wall of the housing (9) and can drive the unlocking push plate (8) to move forward when pressed.

7. The single-load firing mechanism of a biopsy needle device according to claim 6, wherein the number of firing buttons (905) is two, namely a back firing button and a side firing button, the back firing button is fixedly connected with the back end of the outer frame and extends out from the back end of the housing (9), a clamping groove is formed in the side wall of the outer frame, and the side firing button is rotatably connected to the side wall of the housing (9) and is provided with a clamping joint extending into the clamping groove of the side wall of the outer frame.

8. A single-load firing mechanism for a biopsy needle device according to any one of claims 1 to 6, wherein the firing seat (7) and unlocking push plate (8) are both made of rigid plastic.

9. A biopsy needle device having the single firing mechanism of any one of claims 1 to 8.