Needle biopsy device

Abstract

The utility model provides a needle biopsy device which comprises an outer shell, an outer knife tube, an inner knife tube and a transmission mechanism arranged in the outer shell, the near end of the outer knife tube is fixed to the far end of the outer shell, the far end of the inner knife tube is inserted into the outer knife tube, a first sliding face is arranged on one inner wall of the outer shell, and a second sliding face is arranged on the other inner wall of the outer shell. The transmission mechanism comprises a driving part and a driven part, the driven part is arranged on the outer side of the inner cutter tube in a sleeving mode, the driving part is arranged on the outer side of one end of the driven part in a sleeving mode and is in threaded transmission connection with the driven part, and a first guide structure and a limiting structure corresponding to the first sliding face are arranged on the driven part. The other inner wall of the outer shell is provided with a second guide structure slidably connected with the first guide structure so that the driving part can drive the inner knife tube to move relative to the outer knife tube, and the limiting structure and the first sliding face are arranged at intervals, so that shaking of the inner knife tube in the moving process can be reduced, the stability of the inner knife tube in a human body is improved, and the service life of the inner knife tube is prolonged. The injury risk of the patient is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a puncture biopsy device. Background Art

[0002] The puncture biopsy device is a medical device used to sample the patient's living tissue during, for example, a breast tissue biopsy. The puncture biopsy device is mostly used in breast medicine to biopsy clinically inaccessible lesions that are positive in imaging examinations, such as multiple breast fibroids, breast nodules, and gynecomastia. The main purpose of the breast excision puncture needle is to sample breast lesions and partially or completely remove abnormal tissue. Biopsy needles have been increasingly used in recent years because of their high safety, small surgical incision, less bleeding, faster healing, less pain during surgery, convenience, high efficiency of surgery, and no need for hospitalization.

[0003] The puncture biopsy device includes an outer shell, an outer blade tube and an inner blade tube. When working, the inner blade tube needs to be driven to move relative to the outer blade tube so that the cutting device at the end of the inner blade tube cuts the lesion tissue. However, in the prior art, the stability of the puncture biopsy device when inserted into the human body is not high, which will have an adverse effect on cutting the lesion tissue and there is also a risk of patient injury. Utility Model Content

[0004] The purpose of the utility model is to provide a puncture biopsy device, which, through the arrangement of a first guide structure, a second guide structure, a first sliding surface and a limiting structure, can improve the stability of an inner knife tube when it moves, reduce the shaking of the inner knife tube in the human body, and thereby reduce the damage of the puncture biopsy device to the human body.

[0005] The technical solution provided by the utility model is as follows:

[0006] A puncture biopsy device comprises an outer shell, an outer knife tube, an inner knife tube and a transmission mechanism arranged in the outer shell, wherein the proximal end of the outer knife tube is fixed to the distal end of the outer shell, the distal end of the inner knife tube is inserted in the outer knife tube, and a first sliding surface is arranged on an inner wall of the outer shell;

[0007] The transmission mechanism comprises a driving member and a driven member, wherein the driven member is sleeved on the outside of the inner knife tube, and the driving member is sleeved on the outside of one end of the driven member and is threadedly connected to the driven member;

[0008] The follower is provided with a first guide structure and a limiting structure corresponding to the first sliding surface, and the other inner wall of the outer shell is provided with a second guide structure slidably connected to the first guide structure, so that the active member can drive the inner knife tube to move relative to the outer knife tube, and the limiting structure is spaced apart from the first sliding surface.

[0009] In some embodiments, a plane is provided on one side of the outer housing close to the limiting structure to form the first sliding surface, and a second sliding surface parallel to the first sliding surface is provided on one side of the limiting structure close to the first sliding surface.

[0010] In some embodiments, the second guiding structure is provided as a plurality of parallel sliding rails, the first guiding structure is provided as sliding grooves corresponding to the sliding rails one by one, and the sliding rails are movably arranged in the sliding grooves.

[0011] In some embodiments, the driven member includes a driven member body, and a first protrusion and a second protrusion arranged on both sides of the driven member body, and the driving member is sleeved on the outside of the driven member body;

[0012] The sliding groove is formed on the side of the second protrusion away from the driven member body, and the second sliding surface is arranged on the side of the first protrusion away from the driven member body.

[0013] In some embodiments, a first positioning seat is further included, and the first positioning seat is sleeved on the outside of the outer cutter tube and is fixedly connected to the outer cutter tube;

[0014] An installation groove is provided at the distal end of the outer housing, and the first positioning seat is adapted to be snap-fitted with the installation groove to install and fix the first positioning seat in the outer housing.

[0015] In some embodiments, a second positioning seat sleeved on the outside of the inner cutter tube is further included, and the second positioning seat is in clearance fit with the inner cutter tube and is installed and fixed at the proximal end of the outer housing.

[0016] In some embodiments, a first glue injection groove is provided at the connection of the driven member and the inner cutter tube, and a second glue injection groove is provided at the connection of the first positioning seat and the outer cutter tube.

[0017] In some embodiments, an internal thread is provided inside the driving member, and an external thread matching the internal thread is provided on the outside of the driven member;

[0018] A gear is further provided on the driven member, the gear is sleeved on the outside of the driven member, and a through hole is provided on the outer housing, and one end of the gear is located inside the through hole.

[0019] In some embodiments, the outer housing includes an upper half shell and a lower half shell covering the opening of the upper half shell, the first sliding surface and the through hole are both located on the top wall of the upper half shell, and the sliding rails are arranged on the bottom wall of the lower half shell;

[0020] A puncture knife is provided at one end of the outer knife tube away from the drive mechanism, and a sampling groove is further provided on the side wall of the distal end of the outer knife tube. An insulating knife head is provided at one end of the inner knife tube located inside the outer knife tube.

[0021] In some embodiments, the distance between the first sliding surface and the limiting structure is not greater than 0.2 mm.

[0022] The puncture biopsy device provided by the present utility model has the following beneficial effects:

[0023] 1. For the puncture biopsy device provided by the present utility model, the distal end of the inner knife tube is inserted into the outer knife tube, and the proximal end of the outer knife tube is fixed to the distal end of the outer housing, so that the distal end of the inner knife tube can stably move inside the outer knife tube. Moreover, the first guiding structure and the second guiding structure can cooperate with each other, so that while the driving member drives the inner knife tube to move, the stability of the inner knife tube can be improved. The limiting structure and the first sliding surface cooperate with each other to reduce the torsional angle of the inner knife tube, further improving the stability of the inner knife tube during movement, thereby reducing the harm to the human body by the inner knife tube and alleviating the pain of the patient.

[0024] 2. For the puncture biopsy device provided by the present utility model, a first positioning seat is sleeved outside the outer knife tube. The first positioning seat and the outer knife tube are directly connected and fixed by injecting glue into the second glue injection groove. The first positioning seat is snap-fitted with the installation groove of the outer housing, and can stably install and fix the outer knife tube at one end of the outer housing. A second positioning seat is provided outside the inner knife tube, and the second positioning seat is fixed to the proximal end of the outer housing. Through the cooperation of the first positioning seat and the second positioning seat, the stability of the inner knife tube during movement can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following will further illustrate the above characteristics, technical features, advantages and their implementation manners of the solution in a clear and understandable manner in combination with the drawings of the preferred embodiments.

[0026] Figure 1 is a schematic structural diagram of a puncture biopsy device provided by the present utility model;

[0027] Figure 2 is an internal structural diagram of a puncture biopsy device provided by the present utility model;

[0028] Figure 3 is a partial enlarged schematic diagram of A of a puncture biopsy device provided by the present utility model;

[0029] Figure 4 is a cross-sectional view of a puncture biopsy device provided by the present utility model;

[0030] Figure 5It is a schematic structural diagram of a follower of a puncture biopsy device provided by the present utility model.

[0031] Explanation of reference numerals in the drawings:

[0032] Outer housing 1, first sliding surface 11, second guiding structure 12, slide rail 121, upper half shell 13, lower half shell 14, outer cutter tube 2, first positioning seat 21, second glue injection groove 211, puncture knife 22, inner cutter tube 3, second positioning seat 31, transmission mechanism 4, driving member 41, gear 411, follower 42, first guiding structure 421, limiting structure 422, second sliding surface 423, sliding groove 424, first protruding portion 425, second protruding portion 426, first glue injection groove 427, collection shell 5, protective tube 6. Specific embodiments

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the specific embodiments of the present utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other embodiments can be obtained.

[0034] For the sake of simplicity of the drawings, only the parts related to the present utility model are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, for the sake of simplicity and easy understanding of the drawings, in some drawings, components with the same structure or function are only schematically shown for one of them, or only one of them is marked. In this article, "one" not only means "only this one", but also means "more than one" situation.

[0035] In this article, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0037] In one embodiment, a percutaneous biopsy device is described. The first guiding structure 421 and the second guiding structure 12 cooperate with each other, and the first sliding surface 11 and the limiting structure 422 cooperate with each other to achieve stable and reliable operation of the inner cutter tube 3, reduce the harm caused to the human body during the movement of the inner cutter tube, and relieve the pain of the patient.

[0038] Specifically, referring to the accompanying drawings of the specification Figures 1 to 5 , a percutaneous biopsy device includes an outer housing 1, an outer cutter tube 2, an inner cutter tube 3, and a transmission mechanism 4. The transmission mechanism 4 is disposed inside the outer housing 1. In addition, it is set that when a medical staff uses the percutaneous biopsy device, the end of the percutaneous biopsy device close to the medical staff is the proximal end, and the end far from the medical staff is the distal end. The proximal end of the outer cutter tube 2 is fixed to the distal end of the outer housing 1, and the distal end of the inner cutter tube 3 is inserted into the outer cutter tube 2 so that the inner cutter tube 3 can move relative to the outer cutter tube 2. The outer cutter tube 2 is fixedly connected to the outer housing 1, which can improve the stability of the inner cutter tube 3.

[0039] In addition, the transmission mechanism 4 includes a driving member 41 and a driven member 42. The driving member 41 is sleeved outside the driven member 42 and is threadedly connected to the driven member 42. Moreover, the driven member 42 is also sleeved outside the outer cutter tube 2. A first guiding structure 421 and a limiting structure 422 are further provided on the driven member 42. A first sliding surface 11 corresponding to the limiting structure 422 is provided on an inner wall of the outer housing 1, and the first sliding surface 11 and the limiting structure 422 are arranged at intervals. A second guiding structure 12 is further provided at another inner wall of the outer housing 1. The second guiding structure 12 is slidably connected to the first guiding structure 421 so that when the driving member 41 rotates, it can drive the driven member 42 and the inner cutter tube 3 to move relative to the outer cutter tube 2.

[0040] It can be understood that in the prior art, the inner cutter tube moves relative to the outer cutter tube so that the cutting device (puncture knife) located at the end of the inner cutter tube cuts the diseased tissue. Due to the characteristics of the transmission mechanism driving the movement of the inner cutter tube, the inner cutter tube is prone to unstable phenomena such as shaking and torsion during the movement. This is likely to cause greater harm to the human body during the puncture of the inner cutter tube and bring greater pain to the user. In this embodiment, through the cooperation of the first guiding structure 421 and the second guiding structure 12, while the transmission mechanism 4 drives the inner cutter tube 3 to move, the stability of the movement of the inner cutter tube 3 is improved. Through the cooperation of the first sliding surface 11 and the limiting structure 422, the torsion angle of the driven member 42 is further reduced, and further the stability of the movement of the inner cutter tube 3 is improved, and the harm of the percutaneous biopsy device to the human body is reduced.

[0041] In one embodiment, referring to the accompanying drawings of the specification Figure 2 and Figure 4, in this embodiment, the first sliding surface 11 is further described. A plane is provided on one side of the outer housing 1 close to the limiting structure 422 to form the first sliding surface 11, and the first sliding surface 11 is a plane. In addition, a second sliding surface 423 is provided on one side of the limiting structure 422 with respect to the first sliding surface 11, and the first sliding surface 11 and the second sliding surface 423 are arranged in parallel.

[0042] It can be understood that through the arrangement of the first sliding surface 11 and the second sliding surface 423, when the inner cutter tube 3 moves, it is limited by the first sliding surface 11 and the second sliding surface 423, reducing the torsional degree of the follower 42 and the inner cutter tube 3, and thus improving the stability of the inner cutter tube 3 during movement. Generally, the distance between the first sliding surface 11 and the second sliding surface 423 (limiting structure 422) is set to be not greater than 0.2 mm to limit the torsional degree of the follower 42 and the inner cutter tube 3 within a certain angular range (generally between 2° and 5°).

[0043] In addition, a puncture knife 22 is provided at one end of the outer cutter tube 2 away from the transmission mechanism 4, and a sampling groove is also provided on the side wall of the distal end of the outer cutter tube 2. When the outer cutter tube 2 is inserted into the patient's body, the diseased tissue enters the outer cutter tube 2 through the sampling groove. Correspondingly, an insulating cutter head is provided at one end of the inner cutter tube 3 located inside the outer cutter tube 2, and the insulating cutter head is electrically connected to the radio frequency generating device through a conductive wire to realize the cutting of the diseased tissue. It should be noted that by improving the stability of the inner cutter tube 3, the possibility of the conductive wire being broken can be reduced.

[0044] In one example, referring to the accompanying drawings of the specification Figures 1 to 5 , the second guiding structure 12 is provided as a plurality of parallel sliding rails 121. Correspondingly, the first guiding structure 421 is provided as sliding grooves 424 arranged in one-to-one correspondence with the sliding rails 121, and the sliding rails 121 are movably arranged in the sliding grooves 424.

[0045] Furthermore, the follower 42 includes a follower body, a first protrusion 425 and a second protrusion 426. The first protrusion 425 and the second protrusion 426 are respectively arranged on both sides of the follower body, and the first protrusion 425 forms the limiting structure 422. Correspondingly, the driving member 41 is sleeved outside the follower body. The sliding groove 424 is opened on the side of the second protrusion 426 away from the follower body, and the second sliding surface 423 is arranged on the side of the first protrusion 425 away from the follower body.

[0046] It should be noted that the positions of the first protrusion 425 and the second protrusion 426 can be set according to the actual situation, and then the positions of the first sliding surface 11 and the second guiding structure 12 are set according to the positions of the first protrusion 425 and the second protrusion 426. For example, the first protrusion 425 and the second protrusion 426 can be arranged correspondingly, and the first protrusion 425, the driven member body and the second protrusion 426 are in a straight line. Of course, the first protrusion 425 and the second protrusion 426 can also be arranged on the adjacent sides of the driven member body, so that the three are in an L shape. Here, they will not be described one by one, and all are within the protection scope of the present utility model.

[0047] In one embodiment, referring to the accompanying drawings of the specification Figure 2 , this embodiment further describes the puncture biopsy device. It further includes a first positioning seat 21, and the first positioning seat 21 is sleeved outside the outer cutter tube 2 and fixedly connected to the outer cutter tube 2. Correspondingly, an installation groove is provided at the distal end of the outer housing 1, and the first positioning seat 21 is adapted to be snap-fitted with the installation groove, and the first positioning seat 21 can be installed and fixed in the outer housing 1.

[0048] Furthermore, a second glue injection groove 211 is provided at the connection between the first positioning seat 21 and the outer cutter tube 2, and the connection and fixation between the first positioning seat 21 and the outer cutter tube 2 can be realized by injecting glue into the second glue injection groove 211. It can be understood that the first positioning seat 21 is snap-fitted with the installation groove, and the first positioning seat 21 is adhesively fixed to the outer cutter tube 2, so that the outer cutter tube 2 can be stably fixed at the distal end of the outer housing 1. Furthermore, when the distal end of the inner cutter tube 3 is inserted into the outer cutter tube 2, the outer cutter tube 2 can be stably moved in the human body, and the inner cutter tube 3 is subjected to the stable limiting effect of the outer cutter tube 2, thereby improving the stability of the puncture biopsy device.

[0049] Even further, it further includes a second positioning seat 31 sleeved outside the inner cutter tube 3. The second positioning seat 31 is in clearance fit with the inner cutter tube 3 to ensure that the inner cutter tube 3 can move, and the second positioning seat 31 is installed and fixed at the proximal end of the outer housing 1. The setting of the second positioning seat 31 can limit the proximal end of the inner cutter tube 3 and further improve the stability of the inner cutter tube 3 during movement.

[0050] In some embodiments, referring to the accompanying drawings of the specification Figure 4 , a first glue injection groove 427 is provided at the connection between the driven member 42 and the inner cutter tube 3, and the connection and fixation between the driven member 42 and the inner cutter tube 3 can be realized by injecting glue into the first glue injection groove 427. Preferably, both the first glue injection groove 427 and the second glue injection groove 211 can be provided in several numbers to improve the connection stability.

[0051] Further, an internal thread is provided inside the driving member 41, and an external thread that mates with the internal thread is provided on the outer side of the driven member 42. Rotation of the driving member 41 drives the driven member 42 to move. Additionally, a gear 411 is provided on the driven member 42. The gear 411 is sleeved on the outer side of the driven member 42, and a through hole is provided on the outer housing 1 to position one end of the gear 411 inside the through hole. During use, medical staff can rotate the gear 411 to drive the driving member 41 to rotate, thereby driving the driven member 42 and the inner cutter tube 3 to move.

[0052] Furthermore, the outer housing 1 includes an upper half shell 13 and a lower half shell 14 covering the opening of the upper half shell 13. The first sliding surface 11 and the through hole are both located on the top wall of the upper half shell 13, and the slide rail 121 is provided on the bottom wall of the lower half shell 14.

[0053] In addition, a collection shell 5 is provided at the proximal end of the outer housing 1. The proximal end of the inner cutter tube 3 is located inside the collection shell 5, and the collection shell 5 is used to collect the cut lesion tissue. A protective tube 6 is also provided at one end of the outer housing 1 away from the collection shell 5. The protective tube 6 is detachably connected to the outer housing 1, and the outer cutter tube 2 is provided inside the protective tube 6. The protective tube 6 is removed before using the puncture biopsy device.

[0054] It should be noted that the above embodiments can be freely combined as needed. The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A puncture biopsy device, characterized in that, It includes an outer housing, an outer cutter tube, an inner cutter tube, and a transmission mechanism disposed within the outer housing. The proximal end of the outer cutter tube is fixed to the distal end of the outer housing. The distal end of the inner cutter tube is inserted into the outer cutter tube. A first sliding surface is provided on an inner wall of the outer housing. The transmission mechanism includes a driving member and a driven member. The driven member is sleeved outside the inner cutter tube. The driving member is sleeved outside one end of the driven member and is in threaded driving connection with the driven member. The driven member is provided with a first guiding structure and a limiting structure corresponding to the first sliding surface. A second guiding structure slidably connected to the first guiding structure is provided at another inner wall of the outer housing for the driving member to drive the inner cutter tube to move relative to the outer cutter tube. The limiting structure is spaced from the first sliding surface.

2. The puncture biopsy device according to claim 1, wherein, A plane is provided on one side of the outer housing close to the limiting structure to form the first sliding surface. A second sliding surface parallel to the first sliding surface is provided on one side of the limiting structure close to the first sliding surface.

3. The puncture biopsy device according to claim 2, wherein, The second guiding structure is provided as a plurality of parallel rails. The first guiding structure is provided as chutes corresponding to the rails one by one. The rails are movably disposed within the chutes.

4. A puncture biopsy device according to claim 3, characterized in that, The driven member includes a driven member body, and a first protruding portion and a second protruding portion provided on both sides of the driven member body. The driving member is sleeved outside the driven member body. The chute is opened on a side of the second protruding portion away from the driven member body. The second sliding surface is provided on a side of the first protruding portion away from the driven member body.

5. A puncture biopsy device according to any one of claims 1-4, characterized in that, It further includes a first positioning seat sleeved outside the outer cutter tube and fixedly connected to the outer cutter tube. An installation groove is provided at the distal end of the outer housing. The first positioning seat is adapted to be snap-fitted with the installation groove to fixedly install the first positioning seat within the outer housing.

6. The puncture biopsy device according to claim 5, wherein, It further includes a second positioning seat sleeved outside the inner cutter tube. The second positioning seat is in clearance fit with the inner cutter tube and is fixedly installed at the proximal end of the outer housing.

7. A puncture biopsy device according to claim 6, wherein, The driven member is provided with a first glue injection groove at the connection with the inner cutter tube. The first positioning seat is provided with a second glue injection groove at the connection with the outer cutter tube.

8. The puncture biopsy device according to claim 3, characterized in that, Internal threads are provided within the driving member. External threads matching the internal threads are provided on the outside of the driven member. A gear is further provided on the driven member. The gear is sleeved outside the driven member. A through hole is provided on the outer housing. One end of the gear is located within the through hole.

9. The puncture biopsy device according to claim 8, characterized in that, The outer housing includes an upper half shell and a lower half shell covering the opening of the upper half shell. The first sliding surface and the through hole are both located on the top wall of the upper half shell. The rails are provided on the bottom wall of the lower half shell. A puncture knife is provided at one end of the outer cutter tube away from the transmission mechanism. A sampling groove is further provided on the side wall of the distal end of the outer cutter tube. An insulating cutter head is provided at one end of the inner cutter tube located within the outer cutter tube.

10. A puncture biopsy device according to claim 1, characterized in that, The distance between the first sliding surface and the limiting structure is not greater than 0.2 mm.

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