CN219982934U

CN219982934U - Automatic continuous firing mechanism of biopsy needle

Info

Publication number: CN219982934U
Application number: CN202320749811.6U
Authority: CN
Inventors: 肖军; 周蕾; 徐东
Original assignee: Changsha Huiding Medical Technology Co ltd
Current assignee: Changsha Huiding Medical Technology Co ltd
Priority date: 2023-04-06
Filing date: 2023-04-06
Publication date: 2023-11-10
Anticipated expiration: 2033-04-06

Abstract

The utility model belongs to the technical field of medical auxiliary equipment, and particularly relates to an automatic continuous firing mechanism of a biopsy needle. The device comprises a mounting cylinder surrounded by an upper shell and a lower shell with semicircular sections and a firing mechanism arranged in the mounting cylinder; the firing mechanism includes: the needle core pressing device comprises a front lantern ring, a needle cylinder pressing cap, a needle core pressing cap, a rear lantern ring, a firing part, a front sliding block, a rear sliding block, a first transverse spring, a second transverse spring and a guide cylinder; the guide cylinder is arranged along the front-back direction, the first transverse spring and the second transverse spring are sleeved on the guide cylinder, the firing part can be arranged in the mounting cylinder in a front-back sliding way, and the needle cylinder pressing cap is connected with the front lantern ring and extends out of the mounting cylinder; the needle core pressing cap is connected with the rear lantern ring and extends out of the mounting barrel. The automatic continuous firing mechanism of the biopsy needle has compact structure, small volume, convenient operation by one hand, connection or positioning of internal spare parts through various structures and connecting surfaces and good puncture stability.

Description

Automatic continuous firing mechanism of biopsy needle

Technical Field

The utility model belongs to the technical field of medical auxiliary equipment, and particularly relates to an automatic continuous firing mechanism of a biopsy needle.

Background

The biopsy needle is a special diagnosis and treatment tool for taking living samples, and is convenient for medical staff to directly determine the illness state, when the biopsy needle is used, the needle cylinder and the needle core are required to directly penetrate into the tissue structure of a patient, the needle cylinder and the needle core can be directly cut with the tissue structure in the process of puncturing operation, in order to reduce pain of the patient and shorten the time of puncturing operation, the movement speed and accuracy of the needle cylinder and the needle core in the process of puncturing are required to be improved as much as possible, and the early puncture needle is mainly driven based on manual stretching.

Disclosure of Invention

The utility model aims to provide the automatic continuous firing mechanism of the biopsy needle, which can realize automatic continuous control, respectively excite and drive the needle cylinder and the needle core, realize one-key firing continuous action, facilitate the use of medical staff, effectively shorten the puncturing operation time and reduce the uncertainty of the puncturing process.

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

An automatic continuous firing mechanism of a biopsy needle comprises a mounting cylinder 1 surrounded by an upper shell 10 and a lower shell 11 with semicircular sections and a firing mechanism 2 arranged inside the mounting cylinder 1;

a bar-shaped control hole 10a is arranged in the center of the top of the upper shell 10, and a control button 100 capable of sliding back and forth is arranged in the bar-shaped control hole 10 a; the inner wall of the upper shell 10 is provided with a first positioning column 10B and a second positioning column 10B which are positioned at the front side and the rear side of the strip-shaped control hole 10a, the left side and the right side of the first positioning column 10B and the second positioning column 10B are respectively provided with a guide fin plate 10c, and the guide fin plate 10c is provided with a guide groove 10d which extends vertically; the bottom of the lower shell 11 is provided with a strip-shaped sliding groove 11a, and the wall surface of the inner wall of the lower shell 11, which is positioned at the front side of the strip-shaped sliding groove 11a, protrudes to form a front limiting part 11b; a passage port 11c is arranged in the middle of the front limiting part 11b;

the firing mechanism 2 includes: a front collar 20, a syringe pressing cap 21, a needle pressing cap 22, a rear collar 23, a firing member 24, a front slider 25, a rear slider 26, a first lateral spring 27, a second lateral spring 28, and a guide cylinder 29;

the front lantern ring 20 and the rear lantern ring 23 are arranged on the upper side of the strip-shaped sliding groove 11a in a tandem way, and the bottoms of the front lantern ring 20 and the rear lantern ring 23 are provided with a connecting part 9a which can be inserted into the strip-shaped sliding groove 11a and slide back and forth; the needle cylinder 9b is arranged on the connecting part on the front lantern ring 20, the needle core 9c is arranged on the connecting part on the rear lantern ring 23, and the needle core 9c is inserted into the needle cylinder 9 b;

the left side and the right side of the top of the front lantern ring 20 are respectively protruded to form a first limiting block 20a, the rear side of the first limiting block 20a is an inclined rear lower inclined surface, and a supporting plate surface 20c is arranged between the left side and the right side of the first limiting block 20 a;

the top of the rear lantern ring 23 is provided with a linkage rod 23a; the linkage rod 23a extends horizontally and forwards, the front end of the linkage rod is lapped on the supporting plate surface 20c, the rear end of the linkage rod is provided with a second limiting block 23b protruding upwards, the middle part of the linkage rod is provided with a squeezing part 23c protruding upwards, and the front side and the rear side of the squeezing part 23c are inclined upwards;

the guide cylinder 29 is arranged along the front-rear direction, the middle part of the outer wall of the guide cylinder is provided with an annular limiting part 29a, the front sleeve ring 20 is sleeved on the front side cylinder of the annular limiting part 29a, and the rear sleeve ring 23 is sleeved on the rear side cylinder of the annular limiting part 29a;

the first transverse spring 27 and the second transverse spring 28 are sleeved on the guide cylinder 29, and the front end of the first transverse spring 27 props against the front lantern ring 20 to press the front limiting part 11b; the front end of the second transverse spring 28 abuts against the rear collar 23 to press the rear collar against the annular limiting part 29a;

the front sliding block 25 is arranged in the guide grooves on two sides of the first positioning column 10b in a vertically sliding manner, the front sliding block 25 comprises a first limiting body 250 in the middle and a second limiting body 251 positioned on the left side and the right side of the first limiting body 250, and the front side surfaces of the first limiting body 250 and the second limiting body 251 are inclined surfaces obliquely facing downwards; the first positioning column 10b is sleeved with a first vertical spring 40, and the lower end of the first vertical spring 40 props against the front sliding block 25 to press the front sliding block to the linkage rod 23a;

the firing part 24 is arranged in the mounting barrel 1 in a sliding way and comprises a connecting plate surface 24a which horizontally extends forwards to the lower side of the strip-shaped control hole 10a, a control plate surface 24b which is formed by downwards extending the rear edge of the connecting plate surface 24a and then bending backwards, and a pressing plate surface 24c which is positioned at the rear side of the control plate surface 24 b; the connecting plate surface 24a is connected with the control button 100, the front side of the control plate surface 24b is provided with a clearance opening 24d, and the rear side wall surface of the clearance opening 24d is provided with a extrusion head 24e protruding forwards;

the rear sliding block 26 is arranged in the guide grooves on two sides of the second positioning column 10B in a vertically sliding manner, the bottom of the rear sliding block 26 protrudes downwards to form a third limiting body 26a, and the front side and the rear side of the third limiting body 26a are inclined planes which incline downwards; a second vertical spring 41 is sleeved on the second positioning column 10B, and the lower end of the second vertical spring 41 props against the rear sliding block 26 to press the rear sliding block to the clearance opening 24d;

the rear inclined surface of the third limiting body 26a is aligned with the extrusion head 24e, the front inclined surface is aligned with the second limiting block 23b, and the rear inclined surface of the second limiting body 251 is opposite to the rear inclined surface of the first limiting block 20 a;

the syringe pressing cap 21 is connected with the front collar 20 and protrudes from the mounting cylinder 1; the plunger pressing cap 22 is connected to the rear collar 23 and protrudes from the mounting barrel 1.

In a further improved or preferred embodiment of the automatic continuous firing mechanism of the biopsy needle, positioning holes are formed in the inner walls of the rear sides of the upper shell 10 and the lower shell 11, the two positioning holes are arranged opposite to each other, a through hole opposite to the positioning holes is formed in the rear end of the guide cylinder 29, and a positioning rod 5 is arranged in the through hole; the two ends of the positioning rod 5 are inserted into the positioning holes on the upper casing 10 and the lower casing 11.

In a further improved or preferred embodiment of the automatic continuous firing mechanism for biopsy needle, the pressing plate surface 24c is formed by extending the rear edge of the control plate surface 24b downwards, the pressing plate surface 24c is positioned at the rear opening of the mounting barrel 1, and a strip-shaped hole for avoiding the positioning rod 5 is arranged on the control plate surface 24 b.

In a further improved or preferred embodiment of the automatic continuous firing mechanism for biopsy needle, two limiting plates 24f are disposed on the front side of the pressing plate 24c, and the two sides of the rear end of the guiding cylinder 29 are cut out and then clamped between the two limiting plates 24 f.

Further improvement or preferred implementation of the automatic continuous firing mechanism of the biopsy needle, wherein the top center of the upper shell 10 is provided with a bar-shaped limit groove 10e, and a bar-shaped control hole 10a is dug out from the bottom of the bar-shaped limit groove 10 e; the bar-shaped limiting groove 10e extends along the front-rear direction along the bar-shaped control hole 10a and the bar-shaped sliding groove 11 a; limiting guide bars 11d extending in the front-rear direction are provided on the left and right sides of the groove bottom of the bar-shaped sliding groove 11 a.

In a further improved or preferred embodiment of the automatic continuous firing mechanism of the biopsy needle, two positioning plates 11e are arranged on the wall surface of the inner wall of the lower shell 11 behind the strip-shaped sliding groove 11 a; the rear end of the guide tube 29 is cut out from both sides and then is clamped between the two positioning plates 11 e.

In a further improved or preferred embodiment of the automatic continuous firing mechanism of the biopsy needle, the outer edges of the upper shell 10 and the lower shell 11 are provided with movable buckling structures 9d capable of being spliced, and the mounting barrel 1 is formed by splicing the upper shell 10 and the lower shell 11 through the movable buckling structures 9 d.

Further improvement or preferred implementation of the automatic continuous firing mechanism of the biopsy needle, the front end of the lower shell 11 is provided with a positioning end plate 110, and the positioning end plate 110 is provided with a needle cylinder positioning hole 11f opposite to the passage port 11c; the needle cylinder 9b mounted on the front collar 20 sequentially passes through the passage port 11c and the needle cylinder positioning hole 11f and then protrudes.

The beneficial effects are that:

1. the automatic continuous firing mechanism of the biopsy needle has compact structure, small volume, convenient operation by one hand, good puncture stability and the like, and the internal spare and accessory parts are connected or positioned through various structures and connecting surfaces;

2. the elastic drive and the limiting surface are utilized to realize linkage, when the needle is used, the needle cylinder can realize continuous action of quick cutting immediately after the needle core is quickly punctured after the percussion part is pressed after the medical staff only needs to find the position needing to be punctured, the speed is high, the action is stable, and the puncturing efficiency is high;

3. the motion direction and each position node of the movable part are controlled through the internal guiding and limiting structure, the control is accurate and efficient, the motion direction is stable and consistent, the movable part cannot be blocked, and the puncture effectiveness and precision are effectively guaranteed.

Drawings

FIG. 1 is a schematic view of the automatic continuous firing mechanism of a biopsy needle;

FIG. 2 is a schematic structural view of the upper housing;

FIG. 3 is a schematic view of the structure of the lower housing;

FIG. 4 is a schematic view of the firing member

FIG. 5 is a schematic structural view of the rear collar;

FIG. 6 is a schematic view of the structure of the front slider;

FIG. 7 is a schematic view of the structure of the rear slider;

FIG. 8 is an assembled schematic view of an automatic continuous firing mechanism for a biopsy needle;

wherein the reference numerals include:

the needle cartridge comprises an installation cylinder 1, an upper shell 10, a strip-shaped control hole 10a, a first positioning column 10B, a second positioning column 10B, a guide fin plate 10c, a guide groove 10d, a strip-shaped limit groove 10e, a control button 100, a lower shell 11, a strip-shaped sliding groove 11a, a front limit part 11B, a channel opening 11c, a limit guide strip 11d, a positioning plate 11e, a needle cylinder positioning hole 11f, a positioning end plate 110, a firing mechanism 2, a front collar 20, a first limit block 20a, a support plate surface 20c, a needle cylinder pressing cap 21, a needle core pressing cap 22, a rear collar 23, a linkage rod 23a, a second limit block 23B, a pressing part 23c, a firing member 24, a connecting plate surface 24a, a control plate surface 24B, a pressing plate surface 24c, a clearance opening 24d, a pressing head 24e, a limit plate surface 24f, a front slide block 25, a first limit body 250, a second limit body 251, a rear slide block 26, a third limit body 26a, a first lateral spring 27, a second lateral spring 28, a guide cylinder 29, an annular limit part 29a, a connecting part 9B, a needle core 9c, a second spring structure 5, a vertical positioning structure 41 and a vertical positioning rod 5.

Detailed Description

The present utility model will be described in detail with reference to specific examples.

The utility model has the main structure shown in fig. 1-8, and in particular relates to an automatic continuous firing mechanism of a biopsy needle, which is used for improving the existing driving mode and structure of the puncture needle, and provides a mechanism with better stability, smoother action and good action direction retention, thereby improving the effectiveness of a puncture tool and the puncture efficiency.

As shown in fig. 1, it mainly comprises a mounting cylinder 1 surrounded by an upper shell 10 and a lower shell 11 with semi-circular sections, and a firing mechanism 2 arranged inside the mounting cylinder 1;

wherein a bar-shaped control hole 10a is arranged at the center of the top of the upper shell 10, and a control button 100 capable of sliding back and forth is arranged in the bar-shaped control hole 10 a; the inner wall of the upper shell 10 is provided with a first positioning column 10B and a second positioning column 10B which are positioned at the front side and the rear side of the strip-shaped control hole 10a, the left side and the right side of the first positioning column 10B and the second positioning column 10B are respectively provided with a guide fin plate 10c, and the guide fin plate 10c is provided with a guide groove 10d which extends vertically; the bottom of the lower shell 11 is provided with a strip-shaped sliding groove 11a, and the wall surface of the inner wall of the lower shell 11, which is positioned at the front side of the strip-shaped sliding groove 11a, protrudes to form a front limiting part 11b; a passage port 11c is arranged in the middle of the front limiting part 11b;

the firing mechanism 2 comprises a front lantern ring 20, a needle cylinder pressing cap 21, a needle core pressing cap 22, a rear lantern ring 23, a firing piece 24, a front sliding block 25, a rear sliding block 26, a first transverse spring 27, a second transverse spring 28 and a guide cylinder 29;

two limiting plate surfaces 24f are arranged on the front side of the pressing plate surface 24c, and the two sides of the rear end of the guide cylinder 29 are cut out and then clamped between the two limiting plate surfaces 24 f.

The rear side inner walls of the upper shell 10 and the lower shell 11 are provided with positioning holes, the two positioning holes are arranged opposite to each other, the rear end of the guide cylinder 29 is provided with a through hole opposite to the positioning holes, and the positioning rod 5 is arranged in the through hole; the two ends of the positioning rod 5 are inserted into the positioning holes on the upper casing 10 and the lower casing 11.

The pressing plate surface 24c is formed by extending the rear edge of the control plate surface 24b downwards, the pressing plate surface 24c is positioned at the rear opening of the mounting barrel 1, and a strip-shaped hole for avoiding the positioning rod 5 is formed in the control plate surface 24 b.

The bar-shaped limiting groove 10e is arranged in the center of the top of the upper shell 10, and the bar-shaped control hole 10a is dug out from the bottom of the bar-shaped limiting groove 10 e; the bar-shaped limiting groove 10e extends in the front-rear direction along the bar-shaped control hole 10a and the bar-shaped sliding groove 11 a; the groove bottom left and right sides of the bar-shaped slide groove 11a are provided with stopper guide bars 11d extending in the front-rear direction.

Two positioning plates 11e are arranged on the wall surface of the inner wall of the lower shell 11 behind the strip-shaped sliding groove 11 a; the rear end of the guide tube 29 is cut out on both sides and then is caught between the two positioning plates 11 e.

The outer edges of the upper shell 10 and the lower shell 11 are provided with movable buckling structures 9d capable of being spliced, and the mounting cylinder 1 is formed by splicing the upper shell 10 and the lower shell 11 through the movable buckling structures 9 d.

The front end of the lower shell 11 is provided with a positioning end plate 110, and the positioning end plate 110 is provided with a needle cylinder positioning hole 11f which is opposite to the passage port 11c; the needle cylinder 9b mounted on the front collar 20 sequentially passes through the passage port 11c and the needle cylinder positioning hole 11f and then protrudes.

After the biopsy needle is assembled in the configuration shown in fig. 1; sampling and sample retrieval is accomplished based on the following steps:

1. simultaneously pressing the needle cylinder pressing cap and the needle core pressing cap; the needle cylinder presses the cap to drive the front lantern ring to move backwards, and the front lantern ring presses the front sliding block to force the front sliding block to move upwards until the first limiting block (20 a) moves to the rear side of the front sliding block; the needle pressing core presses the cap to drive the rear lantern ring to move backwards, and a second limiting block (23 b) on the rear lantern ring extrudes the rear sliding block to move upwards; until the second limiting block (23 b) moves to the rear side of the rear sliding block; in the process, the first transverse spring, the second transverse spring, the first vertical spring and the second vertical spring are pressed;

2. releasing the syringe pressing cap and the needle pressing core pressing cap; after loosening, the first vertical spring forces the front sliding block to move downwards, the first transverse spring forces the front sleeve ring to move forwards, the front side of the first limiting block (20 a) is propped against the rear side of the front sliding block to be locked, at the moment, the needle cylinder is locked along with the front sleeve ring, and meanwhile, the first transverse spring stores potential; the second vertical spring forces the rear sliding block to move downwards, the second transverse spring forces the rear lantern ring to move forwards, the front side of the second limiting block (23 b) is propped against the rear side of the rear sliding block to be locked, at the moment, the needle core is locked with the lantern ring, and meanwhile, the second transverse spring stores potential;

3. pressing the firing bar to enable the rear sliding block to move upwards until the second limiting block (23 b) is separated from the rear sliding block, releasing the second transverse spring and pushing the rear lantern ring to move forwards quickly, enabling the needle core to move forwards quickly to penetrate into tissues, enabling the extrusion part (23 c) to extrude the front sliding block to move upwards when the rear lantern ring approaches the annular limiting part and is propped against the front part, enabling the first limiting block (20 a) to be separated from the front sliding block, enabling the first transverse spring to be released and pushing the needle cylinder to move forwards quickly to penetrate into the tissues, and completing penetration;

4. after the puncture is confirmed, the sampling needle is moved back; the needle cylinder pressing cap is pressed independently again, the needle cylinder pressing cap drives the front sleeve ring to move backwards, the front sliding block is pressed to force the front sleeve ring to move upwards, at the moment, the needle cylinder moves backwards to expose the needle core in the needle cylinder, meanwhile, the tissue sample is exposed, the front end of the sampling needle is placed into a fixing agent and other medicaments to be washed and rocked gently, and the sample is separated from the needle core to finish sampling.

Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the scope of the present utility model, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.

Claims

1. An automatic continuous firing mechanism of a biopsy needle is characterized by comprising a mounting cylinder (1) surrounded by an upper shell (10) and a lower shell (11) with semicircular sections, and a firing mechanism (2) arranged inside the mounting cylinder (1);

a strip-shaped control hole (10 a) is formed in the center of the top of the upper shell (10), and a control button (100) capable of sliding forwards and backwards is arranged in the strip-shaped control hole (10 a); the inner wall of the upper shell (10) is provided with a first positioning column (10B) and a second positioning column (10B) which are positioned at the front side and the rear side of the strip-shaped control hole (10 a), the left side and the right side of the first positioning column (10B) and the second positioning column (10B) are respectively provided with a guide fin plate (10 c), and the guide fin plate (10 c) is provided with a guide groove (10 d) which extends vertically; the bottom of the lower shell (11) is provided with a strip-shaped sliding groove (11 a), and the wall surface of the inner wall of the lower shell (11) positioned at the front side of the strip-shaped sliding groove (11 a) protrudes to form a front limiting part (11 b); a passage opening (11 c) is arranged in the middle of the front limiting part (11 b);

the firing mechanism (2) comprises: the needle cylinder comprises a front lantern ring (20), a needle cylinder pressing cap (21), a needle core pressing cap (22), a rear lantern ring (23), a firing piece (24), a front sliding block (25), a rear sliding block (26), a first transverse spring (27), a second transverse spring (28) and a guide cylinder (29);

the front lantern ring (20) and the rear lantern ring (23) are arranged on the upper side of the strip-shaped sliding groove (11 a) in a tandem way, and connecting parts (9 a) which can be inserted into the strip-shaped sliding groove (11 a) and slide back and forth are arranged at the bottoms of the front lantern ring (20) and the rear lantern ring (23); a needle cylinder (9 b) is arranged on the connecting part of the front lantern ring (20), a needle core (9 c) is arranged on the connecting part of the rear lantern ring (23), and the needle core (9 c) is inserted into the needle cylinder (9 b);

the left side and the right side of the top of the front lantern ring (20) are respectively protruded to form a first limiting block (20 a), the rear side of the first limiting block (20 a) is an inclined rear lower inclined surface, and a supporting plate surface (20 c) is arranged between the first limiting blocks (20 a) on the left side and the right side;

the top of the rear lantern ring (23) is provided with a linkage rod (23 a); the linkage rod (23 a) horizontally extends forwards, the front end of the linkage rod is lapped on the supporting plate surface (20 c), the rear end of the linkage rod is provided with a second limiting block (23 b) protruding upwards, the middle part of the linkage rod is provided with an extrusion part (23 c) protruding upwards, and the front side and the rear side of the extrusion part (23 c) are inclined planes which are inclined upwards;

the guide cylinder (29) is arranged along the front-back direction, the middle part of the outer wall of the guide cylinder is provided with an annular limiting part (29 a), the front sleeve ring (20) is sleeved on the front side cylinder of the annular limiting part (29 a), and the rear sleeve ring (23) is sleeved on the rear side cylinder of the annular limiting part (29 a);

the first transverse spring (27) and the second transverse spring (28) are sleeved on the guide cylinder (29), and the front end of the first transverse spring (27) props against the front sleeve ring (20) to press the front limiting part (11 b); the front end of the second transverse spring (28) is propped against the rear lantern ring (23) to press the rear lantern ring to the annular limiting part (29 a);

the front sliding block (25) is arranged in the guide grooves on two sides of the first positioning column (10 b) in a vertically sliding manner, the front sliding block (25) comprises a first limiting body (250) in the middle and a second limiting body (251) positioned on the left side and the right side of the first limiting body (250), and the front side surfaces of the first limiting body (250) and the second limiting body (251) are inclined planes obliquely facing downwards; a first vertical spring (40) is sleeved on the first positioning column (10 b), and the lower end of the first vertical spring (40) props against the front sliding block (25) to press the front sliding block to the linkage rod (23 a);

the firing part (24) is arranged in the mounting barrel (1) in a front-back sliding way and comprises a connecting plate surface (24 a) which horizontally extends forwards to the lower side of the strip-shaped control hole (10 a), a control plate surface (24 b) formed by downwards extending the rear edge of the connecting plate surface (24 a) and then bending backwards, and a pressing plate surface (24 c) positioned at the rear side of the control plate surface (24 b); the connecting plate surface (24 a) is connected with the control button (100), the front side of the control plate surface (24 b) is provided with a clearance opening (24 d), and the rear side wall surface of the clearance opening (24 d) is provided with a forward protruding extrusion head (24 e);

the rear sliding block (26) is arranged in the guide grooves on two sides of the second positioning column (10B) in a vertically sliding manner, the bottom of the rear sliding block (26) downwards protrudes to form a third limiting body (26 a), and the front side and the rear side of the third limiting body (26 a) are inclined downwards; a second vertical spring (41) is sleeved on the second positioning column (10B), and the lower end of the second vertical spring (41) props against the rear sliding block (26) to press the rear sliding block to the clearance opening (24 d);

the rear inclined surface of the third limiting body (26 a) is aligned with the extrusion head (24 e), the front inclined surface is aligned with the second limiting block (23 b), and the rear inclined surface of the second limiting body (251) is opposite to the rear inclined surface of the first limiting block (20 a);

the needle cylinder pressing cap (21) is connected with the front lantern ring (20) and extends out of the mounting cylinder (1); the needle core pressing cap (22) is connected with the rear lantern ring (23) and extends out of the mounting cylinder (1).

2. The automatic continuous firing mechanism for biopsy needle according to claim 1, wherein positioning holes are formed in the inner walls of the rear sides of the upper shell (10) and the lower shell (11), the two positioning holes are arranged opposite to each other, a through hole opposite to the positioning hole is formed in the rear end of the guide cylinder (29), and a positioning rod (5) is arranged in the through hole; the two ends of the positioning rod (5) are inserted into the positioning holes on the upper shell (10) and the lower shell (11).

3. The automatic continuous firing mechanism for biopsy needle according to claim 2, wherein the pressing plate surface (24 c) is formed by extending the rear edge of the control plate surface (24 b) downwards, the pressing plate surface (24 c) is positioned at the rear opening of the mounting barrel (1), and a strip-shaped hole for avoiding the positioning rod (5) is arranged on the control plate surface (24 b).

4. The automatic continuous firing mechanism for biopsy needles according to claim 2, wherein two limiting plate surfaces (24 f) are arranged on the front side of the pressing plate surface (24 c), and the two sides of the rear end of the guide cylinder (29) are clamped between the two limiting plate surfaces (24 f) after being excavated.

5. The automatic continuous firing mechanism for biopsy needle according to claim 1, wherein the upper housing (10) has a bar-shaped limiting groove (10 e) at the top center, and the bar-shaped control hole (10 a) is dug out from the bottom of the bar-shaped limiting groove (10 e); the strip-shaped limiting groove (10 e) is provided with a strip-shaped control hole (10 a) and a strip-shaped sliding groove (11 a) which extend along the front-back direction; limiting guide strips (11 d) extending in the front-rear direction are arranged on the left side and the right side of the groove bottom of the strip-shaped sliding groove (11 a).

6. The automatic continuous firing mechanism for biopsy needle according to claim 1, wherein two positioning plates (11 e) are provided on the wall surface of the inner wall of the lower housing (11) behind the bar-shaped sliding groove (11 a); the two sides of the rear end of the guide cylinder (29) are cut out and then clamped between the two positioning plates (11 e).

7. The automatic continuous firing mechanism for biopsy needle according to claim 1, wherein the outer edges of the upper shell (10) and the lower shell (11) are provided with movable buckling structures (9 d) capable of being spliced, and the mounting cylinder (1) is formed by splicing the upper shell (10) and the lower shell (11) through the movable buckling structures (9 d).

8. The automatic continuous firing mechanism for biopsy needle according to claim 1, wherein a positioning end plate (110) is provided at the front end of the lower housing (11), and a needle cylinder positioning hole (11 f) opposite to the passage port (11 c) is provided on the positioning end plate (110); the needle cylinder (9 b) arranged on the front lantern ring (20) sequentially passes through the channel port (11 c) and the needle cylinder positioning hole (11 f) and then extends out.