A fully automatic biopsy needle with a gear shifting structure

Abstract

The present invention relates to a fully automatic biopsy needle with a shifting structure, comprising a needle holder assembly, a needle tube holder assembly, a cover body assembly, a sleeve assembly, a shifting assembly, and a firing connecting rod; the shifting assembly comprises a conversion block and a conversion slider, front plug-in blocks are respectively arranged on both sides of the front end of the conversion block, and rear plug-in blocks are respectively arranged on both sides of the rear end of the conversion block, a shifting slot matched with the front plug-in block and the rear plug-in block is arranged on the outer wall of the sleeve assembly, a shifting spring is arranged between the conversion block and the sleeve assembly, the conversion block is arranged between the outer wall of the sleeve assembly and the inner wall of the cover body assembly, the front plug-in block and the rear plug-in block of the conversion block are pressed into the sleeve assembly, the needle tube holder is arranged between the front plug-in block and the rear plug-in block, the needle holder is arranged on the rear side of the rear plug-in block, and a slidingly matched conversion slider is arranged at the bottom of the rear plug-in block; the needle holder is fired by the firing connecting rod, the travel of the needle holder is limited by the rear plug-in block, and the needle holder drives the conversion slider to move, the conversion slider fires the needle tube holder, and the travel of the needle tube holder is limited by the front plug-in block.

Description

Technical Field

[0001] The invention relates to the technical field of medical detection equipment, in particular to a full-automatic biopsy needle with a gear shifting structure. Background Art

[0002] A biopsy needle is a medical device that is suitable for use in multiple organs such as the kidneys, liver, lungs, breasts, thyroid glands, prostate glands, pancreas, testicles, uterus, ovaries, and body surface. It can be used for sampling living tissue and aspirating cells from vertebral tumors and tumors of unknown types.

[0003] Clinically, when examining a tumor patient, in order to determine the nature of the tumor, a biopsy needle is needed to take some living tissue from the diseased area. In the past, the traditional method of human tissue biopsy was surgical incision, in which the tissue was removed for biopsy. This method has the disadvantages of large trauma, high cost, and great pain for the patient. In recent years, tissue biopsy mainly uses a biopsy needle, which is composed of a needle body, a needle seat, and a needle core. The needle core is inserted into the needle body from the needle seat. The end of the needle core has a needle groove, and the end of the needle body is made into a bevel, forming a blade-like incision. The biopsy needle is used to remove tissue with a small trauma surface and a high biopsy success rate. However, since the parts of the patient that need biopsy sampling are different, such as prostate, kidney, liver, spleen, breast and other tissues, the size of the suspected tumor that needs puncture biopsy is usually different. Therefore, a biopsy needle with a suitable ejection stroke and puncture sampling length is required for surgery. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a fully automatic biopsy needle with a shift structure which is simple in structure and easy to operate.

[0005] In order to solve the above technical problems, the present invention provides a fully automatic biopsy needle with a shifting structure, comprising a needle holder assembly, a needle tube holder assembly, a cover body assembly, a sleeve assembly, a shifting assembly, and a firing connecting rod; the sleeve assembly is placed in the cover body assembly, and the firing connecting rod is arranged between the outer wall of the sleeve assembly and the inner wall of the cover body assembly so that the firing connecting rod can slide axially along the sleeve assembly, the needle holder assembly comprises a needle holder and a biopsy needle, the needle tube holder assembly comprises a needle tube holder and a needle tube, the needle holder and the needle tube holder are slidably arranged in the sleeve assembly, the front end of the needle tube extends out of the sleeve assembly, and the front end of the biopsy needle is deep into the needle tube, the shifting assembly comprises a conversion block and a conversion slider, front insertion blocks are respectively arranged on both sides of the front end of the conversion block, rear insertion blocks are respectively arranged on both sides of the rear end of the conversion block, and the sleeve The outer wall of the assembly is provided with a shift slot compatible with the front plug-in block and the rear plug-in block, a shift spring is provided between the conversion block and the sleeve assembly, the conversion block is placed between the outer wall of the sleeve assembly and the inner wall of the cover body assembly, and the needle tube rack is placed between the front plug-in block and the rear plug-in block after the front plug-in block and the rear plug-in block of the conversion block are pressed into the sleeve assembly, and the needle rack is placed on the rear side of the rear plug-in block, and a sliding conversion slider is provided at the bottom of the rear plug-in block. When the conversion block is not pressed, the needle rack is fired by the firing connecting rod and the needle rack is fired by the needle rack. When the conversion block is pressed, the front plug-in block and the rear plug-in block extend into the sleeve assembly, and the needle rack is fired by the firing connecting rod, and the travel of the needle rack is limited by the rear plug-in block, and the needle rack drives the conversion slider to move, and the conversion slider fires the needle tube rack, and the travel of the needle tube rack is limited by the front plug-in block, thereby realizing the gear adjustment of the moving travel of the needle rack and the needle tube rack.

[0006] Furthermore, the shift assembly also includes a shift button, a button plug-in block is arranged at the bottom end of the shift button, an I-shaped button slot is arranged in the middle of the button plug-in block, button protrusions are arranged on both sides of the button slot, a shift slot suitable for the button plug-in block to pass through is arranged on the cover body assembly, a shift button slot matching the button protrusion is arranged on the inner wall of the shift slot, and an I-shaped column of the plug-in block matching the button slot is arranged on the conversion block, so that the button plug-in block of the shift button can be plugged and matched with the I-shaped column of the plug-in block after passing through the shift slot, so as to facilitate the shift button to press the conversion block, and after the conversion block moves to the desired position, the button protrusion is inserted into the shift button slot to limit the conversion block.

[0007] Furthermore, a slider I-shaped column is arranged on the top of the conversion slider, an I-shaped block slide groove is arranged on the bottom end of the front plug block, and the conversion slider is slidably matched with the block slide groove of the front plug block via the slider I-shaped column.

[0008] Furthermore, a slider spring is arranged in the insert block slide groove, which is used to drive the conversion slider to extend out of the rear insert block, and the slider spring is compressed when the needle holder triggers the conversion slider to move.

[0009] Furthermore, the sleeve assembly includes a plug-in positioning left sleeve and a positioning right sleeve, and the outer wall of the positioning left sleeve is symmetrically provided with connecting rod limit blocks, and a connecting rod slide groove is formed between the two connecting rod limit blocks. The front part of the firing connecting rod is slidably matched with the connecting rod slide groove, and the firing connecting rod is guided by the connecting rod limit blocks.

[0010] Furthermore, a rectangular shift groove is arranged on the positioning right sleeve, the shift slots are arranged at the four corners of the shift groove, spring mounting grooves are arranged at both ends of the shift groove, and the ends of the shift springs are placed in the spring mounting grooves.

[0011] Furthermore, the positioning left sleeve and the positioning right sleeve both include a semicircular first sleeve portion and a second sleeve portion. After the positioning left sleeve and the positioning right sleeve are plugged into each other, the first sleeve portion forms a first cylinder and the second sleeve portion forms a second cylinder. The diameter of the first cylinder is greater than that of the second cylinder.

[0012] Furthermore, the fully automatic biopsy needle with a shift structure also includes a firing button, the firing rod includes a connecting rod body, a firing button slot is arranged at the front end of the connecting rod body, a button clamping column is arranged on the firing button, and a firing window is arranged on the cover body assembly, and the button clamping column passes through the firing window and then is inserted into the firing button slot, so that when the firing button outside the cover body assembly moves, the firing rod is driven to move.

[0013] Furthermore, the tail end of the connecting rod body is L-shaped, a sliding bracket is provided at the tail end of the connecting rod body, and a connecting rod slot suitable for the firing connecting rod to pass through is provided on the first sleeve part, so that the connecting rod body passes through the connecting rod slot and is placed outside the sleeve assembly.

[0014] Furthermore, a needle holder block and a connecting rod block are arranged in the first sleeve part, and a firing chamber is formed between the needle holder block and the connecting rod block after the left positioning sleeve and the right positioning sleeve are plugged in and matched, and the sliding bracket is placed in the firing chamber.

[0015] The technical effects of the invention are as follows: (1) The fully automatic biopsy needle with a shift structure of the present invention, compared with the prior art, is provided with a pressable conversion block. When the conversion block is started, the front plug-in block and the rear plug-in block of the conversion block limit the stroke of the needle holder and the needle rack. When the conversion block is not enabled, the stroke of the needle holder and the needle rack is free and unrestricted, thereby realizing two-speed stroke adjustment to meet different usage requirements; (2) The setting of the conversion slider enables the needle holder to be indirectly driven by the conversion slider when the stroke is limited; (3) By setting a shift button slot and a button protrusion, when the shift button moves to the point where the button protrusion is inserted into the shift button slot, the conversion block is limited; (4) The setting of the shift spring provides elastic support for the conversion block, which is convenient for pressing it; (5) The setting of the slider spring enables the conversion slider to be supported by the slider spring when the conversion slider is not fired, so that the conversion slider protrudes out of the conversion block setting, and the slider spring is compressed when the conversion slider is fired. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of a fully automatic biopsy needle with a gear shift structure;

[0018] Figure 2 It is a schematic diagram of the exploded structure after the cover assembly and the sleeve assembly are separated;

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the upper cover;

[0020] Figure 4 yes Figure 3 A partial enlarged schematic diagram of the middle A area;

[0021] Figure 5 is a three-dimensional structural schematic diagram of a gear shift assembly;

[0022] Figure 6 It is a schematic diagram of the exploded structure of the gear shift assembly;

[0023] Figure 7 It is a three-dimensional structural diagram of a shift button;

[0024] Figure 8 It is a schematic diagram of the decomposition structure of the conversion slider;

[0025] Fig. 9 1 is a three-dimensional structural schematic diagram of the sleeve assembly;

[0026] Fig.10 It is a schematic diagram of the three-dimensional structure of the positioning right sleeve;

[0027] Fig.11 It is a three-dimensional structural schematic diagram of the positioning left sleeve;

[0028] Fig.12 It is a structural schematic diagram of positioning the right sleeve at another angle;

[0029] Fig.13 It is a three-dimensional structural schematic diagram of the firing rod;

[0030] Fig.14 is a schematic diagram of the exploded structure of the biopsy needle assembly;

[0031] Fig.15 is a schematic diagram of the exploded structure of a biopsy needle assembly;

[0032] In the figure:

[0033] Upper cover 10, lower cover 11, push rod window 12, firing window 13, rectangular slot 14, sleeve limit slot 16, shift slot 17, shift button slot 18,

[0034] Positioning left sleeve 20, positioning right sleeve 21, needle holder slide 22, needle tube holder slide 23, connecting rod limit block 24, needle holder block 25, firing chamber 26, needle tube holder block 27, connecting rod block 28, first sleeve portion 210, limit column 211, connecting rod slot 212, second sleeve portion 213, needle holder moving chamber 214, needle tube holder moving chamber 215, needle holder card slot 216, needle tube holder card slot 217, shift slot 221, shift slot 222, spring mounting slot 223,

[0035] Firing rod 30, firing button 31, sliding bracket 32, limiting bracket 33, rear cover 34, firing button slot 35, connecting rod extrusion slot 38, connecting rod body 39,

[0036] Needle holder 50, needle holder push rod 51, needle holder extrusion groove 52, biopsy needle 53, needle holder slot 54, first spring 55, needle holder buckle 56, needle holder plug post 57,

[0037] The needle tube rack 60, the needle tube rack push rod 61, the shielding cover 62, the needle tube 63, the needle tube rack slot 64, the second spring 65, the needle tube rack buckle 66, the needle tube rack plug column 67,

[0038] Shift assembly 70, shift button 71, button insert block 711, button slot 712, button protrusion 713, conversion block 72, front insert block 721, rear insert block 722, insert block slot 723, insert block I-beam column 724, shift spring 73, conversion slider 74, slider I-beam column 741, slider spring 742, plug 75. DETAILED DESCRIPTION

[0039] Example 1

[0040] like Figures 1 to 15 As shown, the fully automatic biopsy needle with a shift structure of this embodiment includes a cover body assembly, a sleeve assembly, a firing rod 30, a firing button 31, a shift assembly 70, a needle holder assembly and a needle tube holder assembly; the cover body assembly includes a semi-cylindrical upper cover 10 and a lower cover 11 that are plugged together, rectangular grooves 14 are symmetrically arranged at the front of the upper cover 10 and the lower cover 11, and rectangular shift grooves are symmetrically arranged on the upper cover and the lower cover, so that after the upper cover 10 and the lower cover 11 are plugged together, the two rectangular grooves 14 form a firing window 13, and the two shift grooves form a shift slot 17.

[0041] The sleeve assembly is placed in the cover body assembly, and the sleeve assembly includes a plug-in positioning left sleeve 20 and a right sleeve 21. The positioning left sleeve 20 and the positioning right sleeve 21 both include a semicircular first sleeve portion 210 and a second sleeve portion 213. After the positioning left sleeve 20 and the positioning right sleeve 21 are plug-in-fitted, the first sleeve portion 210 forms a first cylinder, and the second sleeve portion 213 forms a second cylinder. The diameter of the first cylinder is greater than that of the second cylinder.

[0042] A sleeve limiting groove 16 is also provided in the upper cover 10 and the lower cover 11. A limiting column 211 which is plugged into and cooperates with the sleeve limiting groove 16 is provided on the outer wall of the first sleeve portion 210. During assembly, the limiting column 211 is placed in the sleeve limiting groove 16 for circumferential positioning of the sleeve assembly.

[0043] The firing link 30 is arranged between the outer wall of the sleeve assembly and the inner wall of the cover body assembly so that the firing link 30 can slide axially along the sleeve assembly. The firing link 30 includes a connecting rod body 39. A firing button slot 35 is arranged at the front end of the connecting rod body 39. A button clamping column 311 is arranged on the firing button 31. The button clamping column 311 passes through the firing window 13 and is inserted into the firing button slot 35, so that when the firing button 31 outside the cover body assembly moves, the firing link 30 is driven to move.

[0044] The tail end of the connecting rod body 39 is L-shaped, and a sliding bracket 32 ​​is set at the tail end of the connecting rod body 39. A connecting rod slot 212 suitable for the connecting rod body 39 of the firing connecting rod 30 to pass through is set on the first sleeve part 210, so that the connecting rod body 39 passes through the connecting rod slot 212 and is placed outside the second sleeve part 213.

[0045] A needle holder block 25 and a connecting rod block 28 are disposed in the first sleeve portion 210. After the left sleeve 20 and the right sleeve 21 are positioned and plugged in, a firing chamber 26 is formed between the needle holder block 25 and the connecting rod block 28. The sliding bracket 32 ​​is placed in the firing chamber 26, and the connecting rod slot 212 is placed on the side wall of the firing chamber 26.

[0046] The outer wall of the left positioning sleeve 20 is symmetrically provided with connecting rod limit blocks 24 , and a connecting rod sliding groove is formed between the two connecting rod limit blocks 24 . The front part of the firing connecting rod 30 is slidably matched with the connecting rod sliding groove, and the firing connecting rod 30 is guided by the connecting rod limit blocks 24 .

[0047] Limiting brackets 33 are arranged on both sides of the rear end of the sliding bracket 32 ​​. The limiting brackets 33 are placed outside the connecting rod stopper 28 during assembly.

[0048] A rear cover 34 is provided at the rear end of the limiting bracket 33 for closing the rear end of the cover assembly.

[0049] The needle holder assembly includes a needle holder 50, a needle holder push rod 51, a biopsy needle 53, and a first spring 55. The needle tube holder assembly includes a needle tube holder 60, a needle tube holder push rod 61, a shielding cover 62, a needle tube 63, and a second spring 65. The needle tube holder 60 and the needle holder 50 are slidably arranged in a sleeve assembly composed of a positioning left sleeve 20 and a positioning right sleeve 21, and a needle holder slide groove 22 and a needle tube holder slide groove 23 are arranged on the side wall of the sleeve assembly. A needle tube holder stopper 27 is arranged in the second sleeve portion 213, and the needle tube holder stopper 27 isolates the second sleeve portion 213 into a needle holder moving bin 214 and a needle tube holder moving bin 215. The needle holder slide groove 22 is arranged on one side of the needle holder moving bin 214, and the needle tube holder slide groove 23 is arranged on one side of the needle tube holder moving bin 215.

[0050] A push rod window 12 is provided on one side of the upper cover 10, a shielding cover 62 is fixedly provided at the front end of the sleeve assembly, the tail end of the needle tube 63 is fixedly connected to the front end of the needle tube stand 60, the front end of the needle tube 60 extends out of the shielding cover 62 and is slidably matched with the shielding cover 62, a needle tube stand buckle 66 is provided at the tail end of the needle tube stand 60, a needle tube stand plug column 67 is protruded from one side of the needle tube stand 60, a needle tube stand push rod 61 is slidably provided in the push rod window 12, and a needle tube stand slot 64 adapted to the needle tube stand plug column 67 is provided on the needle tube stand push rod 61 , so that the needle tube rack plug 67 passes through the needle tube rack slide groove 23 and is plugged into the needle tube rack slot 64. When the needle tube rack push rod 61 moves, it drives the needle tube rack 60 and the needle tube 63 to move. A needle tube rack clamping groove 217 matched with the needle tube rack buckle 66 is provided in the middle of the needle tube rack block 27. The second spring 65 is placed between the needle tube rack block 27 and the needle tube rack 60, so that the needle tube rack 60 moves until the needle tube rack buckle 66 is placed in the needle tube rack clamping groove 217. The second spring 65 is compressed to realize the loading of the needle tube 63 and the needle tube rack 60.

[0051] The tail end of the biopsy needle 53 is fixedly connected to the front end of the needle holder 50, the front end of the biopsy needle 53 extends into the needle tube 63 and slides with the needle tube 63, the tail end of the needle holder 50 is provided with a needle holder buckle 56, one side of the needle holder 50 is provided with a needle holder plug 57, the needle holder push rod 51 is slidably arranged in the push rod window 12, and the needle holder push rod 51 is provided with a needle holder slot 54 adapted to the needle holder plug 57, so that the needle holder plug 57 passes through the needle holder slide groove 2 2 is plugged and matched with the needle holder slot 54, and when the needle holder push rod 51 moves, the needle holder 50 and the biopsy needle 53 are driven to move. The middle part of the needle holder stopper 25 is provided with a needle holder clamping groove 216 adapted to the needle holder buckle 56. The first spring 55 is arranged between the needle holder stopper 25 and the needle holder 50, so that the needle holder 50 moves until the needle holder buckle 56 is placed in the needle holder clamping groove 216, and the first spring 55 is compressed, so that the biopsy needle 53 and the needle holder 50 are loaded.

[0052] The shift assembly 70 includes a conversion block 72, a conversion slider 74, a shift button 71, a shift spring 73, a slider spring 742 and a plug 75. Two front plug blocks 721 are symmetrically arranged on both sides of the front end of the conversion block 72, and two rear plug blocks 722 are symmetrically arranged on both sides of the rear end of the conversion block 72. A rectangular shift groove 221 is arranged on the outer wall of the positioning right sleeve 21. Four shift slots 222 are arranged at the four corners of the shift groove 221 to match the front plug blocks 721 and the rear plug blocks 722. Spring mounting grooves 223 are arranged at both ends of the shift groove 221 for limiting the shift spring 73. When assembled, the shift spring 73 is placed between the conversion block 72 and the positioning right sleeve 21.

[0053] A button plug-in block 711 matched with the shift slot 222 is provided at the bottom end of the shift button 71, an I-shaped button slot 712 is provided in the middle of the button plug-in block 711, button protrusions 713 are provided on both side walls of the button slot 712, a shift button slot 18 matched with the button protrusion 713 is provided on the inner wall of the shift slot 222, and an insert block I-shaped column 724 matched with the button slot 712 is provided on the conversion block 72, so that the button plug-in block 711 of the shift button 71 passes through the shift slot 17 and is plugged into and matched with the insert block I-shaped column 724, so that the shift button 71 presses the conversion block 72, and after the conversion block 72 is axially translated to the desired position, the button protrusion 713 is snapped into the shift button slot 18, which is used to limit the conversion block 72.

[0054] A slider I-shaped column 741 is set on the top of the conversion slider 74, and an I-shaped block slot 723 is set at the bottom of the rear plug block 722. The conversion slider 74 slides with the block slot 723 of the rear plug block 722 through the slider I-shaped column 741; a slider spring 742 is set in the block slot 723, which is used to drive the conversion slider 74 to extend out of the rear plug block 722. When the needle holder 50 triggers the conversion slider 74 to move, the slider spring 742 is compressed; after the slider I-shaped column 741 is inserted into the block slot 723, it is limited by the plug 75 to prevent the conversion slider 74 from detaching from the conversion block 72.

[0055] A conical needle rack squeezing groove 52 is also provided at the front end of the needle rack 50, so that when the needle rack 50 moves to abut against the needle tube rack block 27, the needle tube rack buckle 66 is squeezed by the needle rack squeezing groove 52, the needle tube rack buckle 66 is disengaged from the needle tube rack slot 217, and the compressed second spring 66 is fired after the needle tube rack 60 is freed from the restraint.

[0056] A conical connecting rod extrusion groove 38 matched with the needle holder buckle 56 is set in the middle of the sliding bracket 32 ​​of the firing link 30, and the firing link 30 is driven to move by the firing button 31. At this time, the sliding bracket 32 ​​moves in the firing chamber 26. When the sliding bracket 32 ​​moves to abut against the needle holder block 25, the needle holder buckle 56 is squeezed by the connecting rod extrusion groove 38, and the needle holder buckle 56 is separated from the needle holder slot 216. After the needle holder 50 is freed from the restraint, the compressed first spring 55 is fired, thereby realizing the movement of the needle holder 50, and the needle holder 50 realizes the firing of the needle tube holder 60.

[0057] In the process of the firing link 30 firing the needle holder 50 and the needle holder 50 firing the needle tube holder 60, when the conversion block 72 is not pressed, the front insert block 721 and the rear insert block 722 of the conversion block 72 do not enter the sleeve assembly, and will not interfere with the travel of the needle tube holder 60 and the needle holder 50; when the conversion block 72 is pressed by the shift button 71, the front insert block 721 and the rear insert block 722 of the conversion block 72 are pressed into the sleeve assembly, and the needle tube holder 60 is placed between the front insert block 721 and the rear insert block 722, and the needle holder 50 is placed on the rear side of the rear insert block 722, and the travel of the needle holder 50 fired by the firing link 30 and the needle holder 50 is limited by the rear insert block 722, and the needle holder 50 drives the conversion slider 74 to move, and the two conversion sliders 74 are between An extrusion groove is formed, and the extrusion groove squeezes the needle tube rack buckle 66 when moving, and the needle tube rack buckle 66 is disengaged from the needle tube rack slot 217, and the conversion slider 74 replaces the needle rack 50 to fire the needle tube rack 60. The stroke of the needle tube rack 60 is limited by the front insert block 721, thereby realizing the gear adjustment of the moving stroke of the needle rack 50 and the needle tube rack 60. The specific stroke can be set to two gears of 10mm and 20mm, that is, when the shift button 71 is not fired, the moving stroke of the needle rack 50 and the needle tube rack 60 is 20mm, and when the shift button 71 is fired, the moving stroke of the needle rack 50 and the needle tube rack 60 is 10mm. The spacing and position of the front insert block 721, the rear insert block 722 and the conversion slider 74 can be set according to the stroke.

[0058] Obviously, the above embodiments are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A fully automatic biopsy needle with a shifting structure, characterized in that: The invention comprises a needle holder assembly, a needle tube holder assembly, a cover assembly, a sleeve assembly, a shift assembly and a firing connecting rod; the sleeve assembly is placed in the cover assembly, the firing connecting rod is arranged between the outer wall of the sleeve assembly and the inner wall of the cover assembly so that the firing connecting rod can slide axially along the sleeve assembly, the needle holder assembly comprises a needle holder and a biopsy needle, the needle tube holder assembly comprises a needle tube holder and a needle tube, the needle holder and the needle tube holder are slidably arranged in the sleeve assembly, the front end of the needle tube extends out of the sleeve assembly, the front end of the biopsy needle penetrates into the needle tube, the shift assembly comprises a conversion block and a conversion slider, front plug-in blocks are respectively arranged on both sides of the front end of the conversion block, rear plug-in blocks are respectively arranged on both sides of the rear end of the conversion block, and the outer wall of the sleeve assembly is arranged to be compatible with the front plug-in block and the rear plug-in block A shift slot is provided, a shift spring is arranged between the conversion block and the sleeve assembly, the conversion block is placed between the outer wall of the sleeve assembly and the inner wall of the cover body assembly, and the needle tube rack is placed between the front block and the rear block after the front block and the rear block of the conversion block are pressed into the sleeve assembly, and the needle rack is placed on the rear side of the rear block, and a sliding conversion slider is arranged at the bottom of the rear block, when the conversion block is not pressed, the needle rack is fired by the firing connecting rod, and the needle rack is fired by the needle rack, when the conversion block is pressed, the front block and the rear block extend into the sleeve assembly, the needle rack is fired by the firing connecting rod, and the travel of the needle rack is limited by the rear block, and the needle rack drives the conversion slider to move, and the needle tube rack is fired by the conversion slider, and the travel of the needle tube rack is limited by the front block; the cover body assembly includes a semi-cylindrical and plug-fitting upper cover and lower cover.

2. The fully automatic biopsy needle with a gear shift structure according to claim 1, characterized in that: The shift assembly also includes a shift button, a button plug-in block is arranged at the bottom end of the shift button, an I-shaped button slot is arranged in the middle of the button plug-in block, button protrusions are arranged on both sides of the button slot, a shift slot suitable for the button plug-in block to pass through is arranged on the cover body assembly, a shift button slot matching the button protrusion is arranged on the inner wall of the shift slot, and an I-shaped column of the plug-in block matching the button slot is arranged on the conversion block, so that the button plug-in block of the shift button passes through the shift slot and is plugged into the I-shaped column of the plug-in block, so that the shift button presses the conversion block, and the button protrusion is inserted into the shift button slot after the conversion block moves to the desired position.

3. The fully automatic biopsy needle with a shifting structure according to claim 2, characterized in that: The top of the conversion slider is provided with a slider I-shaped column, the bottom of the front plug block is provided with an I-shaped plug block slot, and the conversion slider is slidably matched with the plug block slot of the front plug block via the slider I-shaped column.

4. The fully automatic biopsy needle with a gear shift structure according to claim 3, characterized in that: A slider spring is arranged in the insert block slide groove to drive the conversion slider to extend out and insert the rear block.

5. The fully automatic biopsy needle with a shifting structure according to claim 3 or 4, characterized in that: The sleeve assembly includes a plug-in positioning left sleeve and a positioning right sleeve, the outer wall of the positioning left sleeve is symmetrically provided with connecting rod limit blocks, a connecting rod slide groove is formed between the two connecting rod limit blocks, and the front part of the firing connecting rod is slidably matched with the connecting rod slide groove.

6. The fully automatic biopsy needle with a gear shift structure according to claim 5, characterized in that: A rectangular shift groove is arranged on the positioning right sleeve, the shift slots are arranged at the four corners of the shift groove, spring mounting grooves are arranged at both ends of the shift groove, and the ends of the shift springs are placed in the spring mounting grooves.

7. The fully automatic biopsy needle with a shifting structure according to claim 6, characterized in that: The positioning left sleeve and the positioning right sleeve both include a semicircular first sleeve portion and a second sleeve portion. After the positioning left sleeve and the positioning right sleeve are plugged into each other, the first sleeve portion forms a first cylinder and the second sleeve portion forms a second cylinder. The diameter of the first cylinder is greater than that of the second cylinder.

8. The fully automatic biopsy needle with a shifting structure according to claim 7, characterized in that: It also includes a firing button, the firing link includes a connecting rod body, a firing button slot is arranged at the front end of the connecting rod body, a button clamping column is arranged on the firing button, and a firing window is arranged on the cover body assembly. The button clamping column passes through the firing window and is clamped into the firing button slot, so that the firing button outside the cover body assembly moves and drives the firing link to move.

9. The fully automatic biopsy needle with a gear shift structure according to claim 8, characterized in that: The tail end of the connecting rod body is L-shaped, a sliding bracket is arranged at the tail end of the connecting rod body, and a connecting rod slot suitable for the firing connecting rod to pass through is arranged on the first sleeve part, so that the connecting rod body passes through the connecting rod slot and is placed outside the sleeve assembly.

10. The fully automatic biopsy needle with a gear shift structure according to claim 9, characterized in that: A needle holder block and a connecting rod block are arranged in the first sleeve part, and a firing chamber is formed between the needle holder block and the connecting rod block after the left positioning sleeve and the right positioning sleeve are plugged and matched, and the sliding bracket is placed in the firing chamber.

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