CN217592924U - Breast linear cutting biopsy system - Google Patents

Abstract

The utility model discloses a breast straight line cutting biopsy system, include: a puncture needle tip; the distal end of the outer knife tube is connected with the needle point of the puncture needle, the outer knife tube is provided with a sample receiving and cutting groove, and the edge of the sample receiving and cutting groove, which is close to the distal end of the outer knife tube, is provided with a first cutting edge; the inner cutter is arranged in the outer cutter tube in a penetrating mode, linear movement can be conducted along the axial direction of the outer cutter tube relative to the outer cutter tube, the far end of the inner cutter is provided with a second cutting edge, and the second cutting edge can form shearing motion with the first cutting edge. The inner cutter moves linearly relative to the outer cutter tube along the axial direction of the outer cutter tube, so that the sample tissue is cut; and utilize the cutting of first blade help, through the shearing motion of second blade and first blade for sample tissue can be cut off completely. Compared with the prior art that the breast linear cutting biopsy system is singly rotated and cut by the cutting edge of the inner knife tube, the motion form of the inner knife of the breast linear cutting biopsy system is simple, the sample tissue can be completely cut off, the cutting efficiency is high, and the cutting effectiveness is good.

Description

Breast linear cutting biopsy system

Technical Field

The utility model relates to the technical field of medical equipment, more specifically say, relate to a breast straight line cutting biopsy system.

Background

With the development of medical device technology, breast biopsy is usually obtained by a rotary breast biopsy system to diagnose whether a patient has breast cancer.

The rotary cutting system for breast biopsy in the prior art comprises a disposable puncture needle, an inner knife tube, an outer knife tube, a driving power source, a vacuum pump and an ultrasonic imaging device, wherein the outer knife tube is provided with a sample receiving groove. When vacuum-assisted minimally invasive rotary cutting is performed, the puncture needle is punctured into breast tissues of a human body under the guidance of an ultrasonic imaging device, so that the puncture needle accurately reaches the position near a breast tumor, the breast tumor is adsorbed to a sample receiving groove under the negative pressure suction effect of a vacuum pump, the inner cutter tube is driven to rotate and cut under the action of a driving power source, a tissue sample strip is cut, and the tissue sample strip is conveyed to the outside of the human body along the inner cutter tube under the negative pressure suction effect under the condition that the puncture needle is not withdrawn out of the tissue.

However, in the breast biopsy rotary-cutting system in the prior art, the cutting edge of the inner knife tube is used for rotary cutting, which is likely to cause the incomplete cutting of the tissue.

Therefore, how to ensure that the sample tissue is completely cut off is a problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a linear cutting biopsy system for breast, which can ensure that the sample tissue can be completely cut.

In order to achieve the above object, the present invention provides the following technical solutions:

a linear breast cutting biopsy system comprising:

a puncture needle tip;

the distal end of the outer cutter tube is connected with the needle point of the puncture needle, the outer cutter tube is provided with a sample receiving and cutting groove, and a first cutting edge is arranged on the edge of the sample receiving and cutting groove, which is close to the distal end of the outer cutter tube;

the inner cutter penetrates through the outer cutter tube and can move linearly relative to the outer cutter tube along the axial direction of the outer cutter tube, a second cutting edge is arranged at the far end of the inner cutter, and the second cutting edge can form shearing motion with the first cutting edge.

Optionally, the second cutting edge has a cutting edge, and the second cutting edge protrudes from the distal end of the inner knife; and/or the presence of a gas in the atmosphere,

the first cutting edge is of a V-shaped structure which is inwards concave in the edge of the sample receiving and cutting groove.

Optionally, the inner cutter is of a blade structure, and the outer cutter tube is provided with a plane for matching with the inner cutter.

Optionally, the inner knife is connected with a driving mechanism for driving the inner knife to make linear motion.

Optionally, the drive mechanism comprises:

the screw rod is connected with the inner knife and can be slidably arranged on a shell of the breast linear cutting biopsy system, and the sliding direction of the screw rod is the same as the moving direction of the inner knife;

the input gear is provided with an internal thread which is used for being in threaded connection with the screw;

the driving gear is in meshed transmission with the input gear;

and the rotary power source is used for outputting rotary motion, and an output shaft of the rotary power source is connected with the driving gear.

Optionally, the housing comprises a handle housing and a consumable housing connected to the handle housing; the rotary power source and the driving gear are arranged in the handle shell; the input gear and the screw rod are arranged in the consumable shell.

Optionally, one of the consumable housing and the screw is provided with a guide groove, and the other is provided with a guide part for sliding fit with the guide groove; and/or the presence of a gas in the gas,

the both ends of input gear are equipped with the shoulder respectively, the consumptive material casing is equipped with and is used for right the shoulder carries out the spacing portion of axial.

Optionally, a fixing seat is arranged in the consumable shell, the fixing seat is provided with a mounting hole and a limiting step, the outer cutter tube is inserted into the mounting hole and abuts against the limiting step, and the outer cutter tube is bonded with the fixing seat.

Optionally, the puncture needle tip includes a first cutting edge, a second cutting edge, a third cutting edge and a fourth cutting edge, the length of the first cutting edge is shortest, the length of the second cutting edge is equal to that of the third cutting edge, the length of the fourth cutting edge is longest, and the first cutting edge, the second cutting edge, the third cutting edge and the fourth cutting edge intersect at a point.

The utility model provides a breast straight line cutting biopsy system, during the use, inside getting into human tissue with the puncture needle point puncture, and make puncture needle point arrive near target tissue, so that target tissue is sucked the sample under the negative pressure suction effect and is received cutting groove, at this moment, be rectilinear movement for outer sword pipe along the axial of outer sword pipe through making interior sword, make the distal end direction motion of interior sword orientation near outer sword pipe, along with the rectilinear movement of interior sword, under the effect of the second blade of interior sword, cut sample tissue, move the distal end to outer sword pipe until interior sword, at this in-process, the first blade that cuts cutting groove is received with the sample to the second blade of interior sword forms shearing motion, cut sample tissue completely.

Therefore, the inner knife linearly moves relative to the outer knife tube along the axial direction of the outer knife tube, so that the sample tissue is cut; and, set up first blade through the border that receives the cutting groove at the sample and be close to the distal end of outer sword pipe, utilize first blade help cutting, through the shearing motion of second blade and first blade for sample tissue can be cut off completely. Compare in the single blade that relies on interior sword pipe of prior art and carry out the rotary cutting, the utility model provides a motion form of breast straight line cutting biopsy system's interior sword is simple, and can ensure that sample tissue can be cut off completely, cuts efficiently, and the cutting validity is good.

In addition, the inner knife does linear cutting motion, compared with rotary cutting, the risk that tissues are twisted in can be avoided, the vibration of the breast linear cutting biopsy system can be reduced, and the reliability is better. Further, compared with rotary cutting, the inner cutter performs linear cutting, the limitation on the shapes of the outer cutter pipe and the inner cutter is reduced, the shapes of the outer cutter pipe and the inner cutter do not need to be in a round pipe shape, the shapes of the outer cutter pipe and the inner cutter can be optimally designed according to specific conditions, and the design space is larger.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a breast linear cutting biopsy system according to an embodiment of the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a schematic view of the second cutting edge and the first cutting edge of FIG. 1;

FIG. 4 is a schematic structural view of the inner blade of FIG. 1;

FIG. 5 is a schematic structural view of the outer cutter tube in FIG. 1;

fig. 6 is a schematic structural view of an outer knife tube and an inner knife of a breast linear cutting biopsy system according to a second embodiment of the present invention;

fig. 7 is a schematic structural view of the driving mechanism and the housing in the embodiment of the present invention;

FIG. 8 is a schematic structural view of the needle tip of the puncture needle in the embodiment of the present invention;

fig. 9 is a left side view of fig. 8.

The reference numerals in fig. 1 to 9 are as follows:

the puncture needle comprises a puncture needle point 1, a puncture needle point 11, a puncture needle point 13, a puncture point 14, a puncture needle point 2, an outer cutter tube 21, a sample receiving and cutting groove 21, a first cutting edge 211, a flat surface 22, an inner cutter 3, a second cutting edge 31, a cutting edge 311, a screw 41, a guide 411, an input gear 42, a shoulder 421, a drive gear 43, a rotary power source 44, an output shaft 441, a housing 5, a handle housing 51, a consumable housing 52, a pin 521, a fixing seat 6 and a positioning part 61.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The core of the utility model is to provide a breast straight line cutting biopsy system, which can ensure that the sample tissue can be completely cut off.

Referring to fig. 1 to 9, fig. 1 is a schematic structural diagram of a breast linear cutting biopsy system according to an embodiment of the present invention; FIG. 2 is a front view of FIG. 1; FIG. 3 is a schematic view of the second cutting edge and the first cutting edge of FIG. 1; FIG. 4 is a schematic structural view of the inner blade of FIG. 1; FIG. 5 is a schematic structural view of the outer cutter tube in FIG. 1; fig. 6 is a schematic structural view of an outer knife tube and an inner knife of a breast linear cutting biopsy system according to a second embodiment of the present invention; fig. 7 is a schematic structural view of the driving mechanism and the housing in the embodiment of the present invention; FIG. 8 is a schematic structural view of the tip of the puncture needle according to an embodiment of the present invention; fig. 9 is a left side view of fig. 8.

Referring to fig. 1-5, an embodiment of the present invention provides a breast linear cutting biopsy system, which includes a puncture needle tip 1, an outer knife tube 2 and an inner knife 3, wherein the puncture needle tip 1 is connected to a distal end of the outer knife tube 2, the outer knife tube 2 is provided with a sample receiving and cutting groove 21, and a first cutting edge 211 is disposed at an edge of the sample receiving and cutting groove 21, which is close to the distal end of the outer knife tube 2; the inner knife 3 is arranged in the outer knife pipe 2 in a penetrating manner, the inner knife 3 can move linearly relative to the outer knife pipe 2 along the axial direction of the outer knife pipe 2, the far end of the inner knife 3 is provided with a second cutting edge 31, and the arrangement position of the second cutting edge 31 corresponds to the first cutting edge 211, so that the second cutting edge 31 can form shearing motion with the first cutting edge 211.

When the puncture needle is used, the puncture needle point 1 is punctured into human tissue, the puncture needle point 1 reaches the position near target tissue, so that the target tissue is sucked into the sample receiving and cutting groove 21 under the action of negative pressure suction, at the moment, the inner knife 3 moves towards the direction close to the far end of the outer knife tube 2 by enabling the inner knife 3 to move linearly relative to the outer knife tube 2 along the axial direction of the outer knife tube 2, along with the linear movement of the inner knife 3, the sample tissue is cut under the action of the second cutting edge 31 of the inner knife 3 until the inner knife 3 moves to the far end of the outer knife tube 2, and in the process, the second cutting edge 31 of the inner knife 3 and the first cutting edge 211 of the sample receiving and cutting groove 21 form a cutting motion, and the sample tissue is completely cut.

Therefore, in the embodiment, the inner knife 3 linearly moves relative to the outer knife tube 2 along the axial direction of the outer knife tube 2, so that the sample tissue is cut; and, through receiving the border that cuts the distal end that cutting groove 21 is close to outer sword pipe 2 at the sample and set up first blade 211, utilize first blade 211 help cutting, through the shearing motion of second blade 31 and first blade 211 for the sample tissue can be cut off completely. Compare in the single blade that relies on interior sword pipe of prior art and carry out the rotary cutting, the utility model provides a breast straight line cutting biopsy system's interior sword 3's motion form is simple, and can ensure that the sample tissue can be cut off completely, cuts efficiently, and cutting validity is good.

In addition, the inner knife 3 does linear cutting motion, compared with rotary cutting, the risk that tissues are twisted in can be avoided, the vibration of the breast linear cutting biopsy system can be reduced, and the reliability is better. Further, compared with the rotary cutting, the inner cutter 3 performs linear cutting, the limitation on the shapes of the outer cutter tube 2 and the inner cutter 3 is reduced, the shapes of the outer cutter tube 2 and the inner cutter 3 do not need to be in a round tube shape, the shapes of the outer cutter tube 2 and the inner cutter 3 can be optimally designed according to specific conditions, and the design space is larger.

In this embodiment, the distal end of the outer blade tube 2 and the distal end of the inner blade 3 are both the ends close to the human tissue when operating.

To enhance the cutting effect, in some embodiments, as shown in fig. 3 and 4, the second cutting edge 31 has a tip 311, and the second cutting edge 31 protrudes from the distal end of the inner knife 3; and/or, as shown in fig. 3, the first cutting edge 211 is a V-shaped structure recessed within the edge of the sample receiving cutting groove 21. Therefore, when cutting, the blade tip 311 of the second cutting edge 31 firstly pierces into the tissue, and then the cutting is carried out by the blade edge of the second cutting edge 31, so that the cutting effect of the second cutting edge 31 can be improved, and the cutting efficiency can be improved; in addition, when first blade 211 help the cutting, sample tissue gets into the V font structure of indent, utilizes the cutting edge of first blade 211 to cut, is favorable to cutting sample tissue completely.

Certainly, in other embodiments, the second cutting edge 31 may also be an inward V-shaped structure, and the first cutting edge 211 is a protruding cutting edge protruding from the edge of the sample receiving cutting groove 21; or, the second cutting edge 31 and the first cutting edge 211 are convex cutting edges, or the second cutting edge 31 and the first cutting edge 211 are concave cutting edges, so as to meet the requirements of different operations.

Further, in some embodiments, as shown in fig. 6, the inner cutter 3 is a blade structure, and the outer cutter tube 2 is provided with a flat surface 22 for mating with the inner cutter 3. It can be understood that, the inner knife 3 is designed into a blade structure, which is beneficial to controlling the sharpness and the strength of the inner knife 3, saving the cost and being convenient to process. The outer cutter tube 2 is provided with a plane 22 for matching with the inner cutter 3, which is beneficial to ensuring the stability of the linear cutting motion of the inner cutter 3.

In addition, in order to enhance the cutting sharpness, in some embodiments, the first cutting edge 211 and/or the second cutting edge 31 are inclined-type cutting edges, that is, the first cutting edge 211 and/or the second cutting edge 31 have a slope, which is favorable for enhancing the cutting sharpness.

In order to facilitate the linear movement of the inner knife 3 relative to the outer knife tube 2, in some embodiments, the inner knife 3 is connected to a driving mechanism, and the driving mechanism is used for driving the inner knife 3 to perform linear motion. That is to say, this embodiment utilizes actuating mechanism drive inner cutter 3 to do rectilinear motion, can ensure the accuracy of inner cutter 3 motion, promotes cutting efficiency.

In the present embodiment, the specific structure of the driving mechanism is not limited as long as the inner blade 3 can be driven to move linearly.

Referring to fig. 1 and 2, in some embodiments, the driving mechanism includes a screw 41, an input gear 42, a driving gear 43, and a rotary power source 44, the screw 41 is connected to the inner blade 3, the screw 41 is slidably disposed in the housing 5 of the breast linear-cutting biopsy system, and the sliding direction of the screw 41 is the same as the moving direction of the inner blade 3; the input gear 42 is provided with an internal thread for threaded connection with the screw 41; the driving gear 43 is in meshed transmission with the input gear 42; the rotary power source 44 is for outputting rotary motion, and an output shaft 441 of the rotary power source 44 is connected to the drive gear 43.

During operation, the rotary power source 44 outputs rotary motion to drive the driving gear 43 to rotate together, the driving gear 43 is in meshing transmission with the input gear 42, so that the input gear 42 rotates, the screw rod 41 is slidably arranged on the shell 5 of the breast linear cutting biopsy system, that is, the screw rod 41 only has a degree of freedom of sliding along the moving direction of the inner knife 3, and the internal thread of the input gear 42 is in threaded connection with the screw rod 41, that is, the internal thread forms threaded fit with the external thread of the screw rod 41, when the input gear 42 rotates, the internal thread rotates to generate thrust on the external thread, so that the screw rod 41 drives the inner knife 3 to move, and linear cutting of the inner knife 3 is realized.

That is, the present embodiment transmits the torque to the input gear 42 through the driving gear 43 under the driving of the rotation power source 44, and converts the torque into the forward or backward movement of the inner cutter 3 in the outer cutter tube 2 through the screw engagement of the input gear 42 and the screw 41. Therefore, the driving mechanism has the advantages of simple working principle, high reliability and compact structure.

In some embodiments, the rotary power source 44 is an electric motor.

To facilitate the provision of the drive mechanism, in some embodiments, as shown in fig. 1 and 2, the housing 5 comprises a handle housing 51 and a consumable housing 52 connected to the handle housing 51; the rotary power source 44 and the drive gear 43 are provided in the handle case 51; the input gear 42 and the screw 41 are provided in the consumable housing 52. That is, the housing 5 is divided into two parts in the present embodiment, which are designed as a handle housing 51 and a consumable housing 52, and it should be noted that the handle housing 51 is used for the physician to grasp during operation. By locating the rotary power source 44 and the drive gear 43 within the handle housing 51 and the input gear 42 and the threaded rod 41 within the consumable housing 52, it is advantageous to make reasonable use of the interior space of the housing 5 and to make the balance of the balance appropriate.

To facilitate limiting the sliding of the threaded rod 41, in some embodiments, one of the consumable housing 52 and the threaded rod 41 is provided with a guide slot, and the other is provided with a guide 411 for sliding engagement with the guide slot. When the screw 41 drives the inner knife 3 to move, the guide part 411 moves along the direction limited by the guide groove, so that the motion stability of the inner knife 3 can be improved, and the moving direction correctness of the inner knife 3 can be improved, and the cutting precision is improved.

Referring to fig. 7, in one embodiment, the consumable housing 52 is provided with a guide slot, and the screw 41 is provided with a guide portion 411 for facilitating the processing.

In some embodiments, the guide 411 is an elongated key.

Referring to fig. 7, in some embodiments, the input gear 42 is provided with shoulders 421 at two ends thereof, and the consumable housing 52 is provided with a limiting portion for axially limiting the shoulders 421. That is, the present embodiment axially limits the shoulder 421 by the limiting portion, so that the input gear 42 has only rotational freedom, which is beneficial to ensure the positional accuracy of the input gear 42.

Referring to fig. 1 and 2, in order to facilitate the fixing of the outer cutter tube 2, in some embodiments, a fixing seat 6 is disposed in the consumable housing 52, the fixing seat 6 is provided with a mounting hole and a limiting step, the outer cutter tube 2 is inserted into the mounting hole and abuts against the limiting step, and the outer cutter tube 2 is bonded to the fixing seat 6. That is to say, in this embodiment, the outer knife pipe 2 is installed in the consumable housing 52 through the fixing seat 6, the outer knife pipe 2 is limited by the limiting step, which is beneficial to positioning the outer knife pipe 2, and the outer knife pipe 2 is inserted into the installation hole, so that the outer knife pipe 2 and the fixing seat 6 are installed, which is convenient for assembly and easy for operation; moreover, the outer cutter tube 2 is bonded with the fixed seat 6, so that the firmness and reliability of connection of the outer cutter tube 2 and the fixed seat 6 can be improved.

Referring to fig. 7, in some embodiments, the fixing seat 6 is provided with a pin hole and a positioning portion 61, and the consumable housing 52 is provided with a pin 521 for matching with the pin hole and a positioning groove for matching with the positioning portion 61. During the installation, aim at the constant head tank of consumptive material casing 52 with fixing base 6's location portion 61, be favorable to fixing base 6's quick location, then insert the pinhole of fixing base 6 and consume material casing 52's round pin post 521, realize fixing base 6 and consumptive material casing 52's installation.

In the above embodiments, the specific structure of the puncture needle tip 1 is not limited as long as it can perform a puncturing function.

Referring to fig. 8 and 9, in some embodiments, the puncture needle tip 1 includes a first cutting edge 11, a second cutting edge 12, a third cutting edge 13, and a fourth cutting edge 14, wherein the first cutting edge 11 has the shortest length, the second cutting edge 12 and the third cutting edge 13 have the same length, and the fourth cutting edge 14 has the longest length, and the first cutting edge 11, the second cutting edge 12, the third cutting edge 13, and the fourth cutting edge 14 intersect at a point, which is a puncture point 111.

When the puncture needle point 1 punctures the human tissue, the puncture point 111 firstly punctures the human tissue, then the first cutting edge 11, the second cutting edge 12, the third cutting edge 13 and the fourth cutting edge 14 cut simultaneously, so that the tissue around the puncture needle point 1 is gradually opened, because the length of the first cutting edge 11 is shortest, the first cutting edge 11 firstly and completely enters the human tissue, then the second cutting edge 12, the third cutting edge 13 and the fourth cutting edge 14 continue to cut, so that the human tissue around the puncture needle point 1 continues to be opened, after the second cutting edge 12 and the third cutting edge 13 completely enter the human tissue, the fourth cutting edge 14 continues to cut, so that the human tissue around the puncture needle point 1 further opens. This embodiment is through the first cutting arris 11 that design length is different, second cutting arris 12, third cutting arris 13 and fourth cutting arris 14, make the cutting wound that the human tissue that punctures formed littleer, and, utilize first cutting arris 11, second cutting arris 12, four cutting arris of third cutting arris 13 and fourth cutting arris 14 cut, make pjncture needle point 1 sharper, can reduce the resistance of continuous puncture in-process, make the doctor not need too big strength just can puncture smoothly, be favorable to puncturing the compactness tissue among the human tissue etc..

Further, in some embodiments, the puncture needle tip 1 is an eccentric tip, which facilitates the formation of the first cutting edge 11, the second cutting edge 12, the third cutting edge 13, and the fourth cutting edge 14 having different lengths.

In addition, referring to fig. 9, in some embodiments, a first curved surface 15 is formed between the first cutting edge 11 and the second cutting edge 12, a second curved surface 16 is formed between the first cutting edge 11 and the third cutting edge 13, and the first curved surface 15 and the second curved surface 16 are symmetrical with respect to the first cutting edge 11; a third curved surface 17 is formed between the fourth cutting edge 14 and the second cutting edge 12, a fourth curved surface 18 is formed between the fourth cutting edge 14 and the third cutting edge 13, and the third curved surface 17 and the fourth curved surface 18 are symmetrical with respect to the fourth cutting edge 14. It will be appreciated that the first curved surface 15, the second curved surface 16, the third curved surface 17 and the fourth curved surface 18 are designed to prevent the soft tissue from sticking to the puncture needle tip 1 after the puncture of the puncture needle tip 1.

Further, while the above embodiments are not limited to the specific connection between the lancet tip 1 and the outer blade 2, in some embodiments, as shown in fig. 8, the lancet tip 1 is provided with a coupling portion 19, and the coupling portion 19 is connected to the distal end of the outer blade 2. In some embodiments, the connection 19 is welded to the distal end of the outer blade tube 2. In some embodiments, the connecting portion 19 is a truncated cone-shaped structure.

It should also be noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The above has detailed the breast linear cutting biopsy system provided by the present invention. The principles and embodiments of the present invention have been explained herein using specific examples, and the above description of the embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the scope of the appended claims.

Claims (9)

1. A linear breast cutting biopsy system, comprising:

a puncture needle tip (1);

the far end of the outer knife tube (2) is connected with the puncture needle point (1), the outer knife tube (2) is provided with a sample receiving and cutting groove (21), and the edge of the sample receiving and cutting groove (21) close to the far end of the outer knife tube (2) is provided with a first cutting edge (211);

the inner knife (3) penetrates through the outer knife pipe (2), and can move linearly relative to the outer knife pipe (2) along the axial direction of the outer knife pipe (2), a second cutting edge (31) is arranged at the far end of the inner knife (3), and the second cutting edge (31) can form shearing motion with the first cutting edge (211).

2. The linear breast cutting biopsy system according to claim 1, wherein the second cutting edge (31) has a cutting edge (311), and the second cutting edge (31) protrudes beyond the distal end of the inner knife (3); and/or the presence of a gas in the atmosphere,

the first cutting edge (211) is of a V-shaped structure inwards concave in the edge of the sample receiving and cutting groove (21).

3. The linear breast cutting biopsy system according to claim 1, wherein the inner knife (3) is a blade structure and the outer knife tube (2) is provided with a flat surface (22) for mating with the inner knife (3).

4. The linear breast cutting biopsy system according to any one of claims 1-3, wherein a drive mechanism is connected to the inner knife (3) for driving the inner knife (3) in a linear motion.

5. The linear breast cutting biopsy system of claim 4, wherein the drive mechanism comprises:

the screw rod (41) is connected with the inner knife (3), the screw rod (41) is slidably arranged on a shell (5) of the breast linear cutting biopsy system, and the sliding direction of the screw rod (41) is the same as the moving direction of the inner knife (3);

an input gear (42) provided with an internal thread for screw-coupling with the screw (41);

a drive gear (43) in meshing transmission with the input gear (42);

a rotary power source (44) for outputting a rotary motion, an output shaft (441) of which is connected to the drive gear (43).

6. The linear breast cutting biopsy system according to claim 5, wherein the housing (5) comprises a handle housing (51) and a consumable housing (52) connected to the handle housing (51); the rotary power source (44) and the driving gear (43) are arranged in the handle shell (51); the input gear (42) and the screw (41) are disposed within the consumable housing (52).

7. The linear breast cutting biopsy system according to claim 6, wherein one of the consumable housing (52) and the threaded rod (41) is provided with a guide slot, and the other is provided with a guide portion (411) for sliding engagement with the guide slot; and/or the presence of a gas in the gas,

the two ends of the input gear (42) are respectively provided with a shoulder (421), and the consumable shell (52) is provided with a limiting part for axially limiting the shoulder (421).

8. The breast linear cutting biopsy system according to claim 6, wherein a fixed seat (6) is provided in the consumable housing (52), the fixed seat (6) is provided with a mounting hole and a limiting step, the outer knife tube (2) is inserted into the mounting hole and abuts against the limiting step, and the outer knife tube (2) is bonded with the fixed seat (6).

9. The linear breast cutting biopsy system according to any one of claims 1-3, wherein the puncture needle tip (1) comprises a first cutting edge (11), a second cutting edge (12), a third cutting edge (13) and a fourth cutting edge (14), the first cutting edge (11) having the shortest length, the second cutting edge (12) and the third cutting edge (13) having the same length, the fourth cutting edge (14) having the longest length, and the first cutting edge (11), the second cutting edge (12), the third cutting edge (13) and the fourth cutting edge (14) intersecting at a point.

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