A biopsy needle puncture outer knife tube assembly positioning device

Abstract

The present invention discloses a biopsy needle puncture outer knife tube assembly and positioning device, which is used to realize the assembly of a sleeve and an outer knife tube, and is characterized in that it includes a device body, on which a first positioning portion for positioning the sleeve and a second positioning portion for positioning the outer knife tube are provided, and the first positioning portion and the second positioning portion are located in the same axial direction; after the sleeve and the outer knife tube are pre-sheathed, they are placed on the device body, the sleeve is placed on the first positioning portion, and the outer knife tube is placed on the second positioning portion, so as to realize the coaxial assembly and positioning between the sleeve and the outer knife tube, so as to perform a subsequent fixed connection. The device eliminates the assembly error of the outer knife tube and the sleeve, and improves the surgical accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to an assembly and positioning device for an outer blade tube of a biopsy needle puncture. Background Art

[0002] With the rapid increase in the incidence of breast diseases, breast biopsy puncture needles are increasingly used in minimally invasive surgical procedures. Since the puncture tip of the blade is relatively sharp and dangerous, it is difficult to measure the distance between the puncture tip and the top end face of the outer blade tube. Moreover, when the outer blade tube is fixed, how to ensure that the axis of the outer blade tube coincides with the axis of the inner wall of the outer blade tube sleeve has a certain impact on the function of the biopsy puncture needle product.

[0003] In the prior art, the outer knife tube is generally assembled in the sleeve manually. However, the manual method cannot ensure that the outer knife tube is assembled in place, resulting in assembly errors, thereby reducing surgical accuracy. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide a biopsy needle puncture outer knife tube assembly positioning device, which eliminates the assembly error between the outer knife tube and the sleeve and improves the surgical accuracy.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A biopsy needle puncture outer knife tube assembly positioning device, used to realize the assembly of a sleeve and an outer knife tube, comprising a device body, the device body is provided with a first positioning portion for positioning the sleeve, and a second positioning portion for positioning the outer knife tube, and the first positioning portion and the second positioning portion are located in the same axial direction;

[0007] After the sleeve and the outer knife tube are pre-installed, they are placed on the device body, the sleeve is placed on the first positioning part, and the outer knife tube is placed on the second positioning part to achieve coaxial assembly positioning between the sleeve and the outer knife tube for subsequent fixed connection.

[0008] According to an embodiment of the present invention:

[0009] The first positioning portion is a first arc groove provided on the device body, the outer wall of the sleeve is provided with a first arc surface, and the diameter of the first arc surface is the same as that of the first arc groove;

[0010] The second positioning portion is a second arc groove provided on the device body, the second arc groove and the first arc groove are coaxially arranged, the outer wall of the outer knife tube is provided with a second arc surface, and the diameter of the second arc surface is the same as that of the second arc groove;

[0011] During assembly and positioning, the first arc surface is fitted with the first arc groove surface, and the second arc surface is fitted with the second arc groove surface.

[0012] According to an embodiment of the present invention:

[0013] A first axial positioning portion is provided between the sleeve and the device body;

[0014] A second axial positioning portion is provided between the outer knife tube and the device body;

[0015] The sleeve and the outer knife tube are axially fixed on the device body through the first axial positioning portion and the second axial positioning portion respectively.

[0016] According to an embodiment of the present invention:

[0017] The first axial positioning portion includes a first positioning surface and a first positioning matching surface;

[0018] The sleeve is provided with a positioning flange, and one end surface of the positioning flange is the first positioning surface;

[0019] The device body is provided with an assembly window, and one end surface of the assembly window is the first positioning matching surface;

[0020] The first positioning surface is fitted with the first positioning matching surface to achieve axial positioning of the sleeve.

[0021] According to an embodiment of the present invention, the positioning flange is provided at one end of the sleeve where the mounting hole opens, and the first positioning surface is an end surface of the positioning flange close to the sleeve.

[0022] According to an embodiment of the present invention:

[0023] The second axial positioning portion includes a third positioning surface and a third positioning matching surface;

[0024] The outer knife tube is provided with a knife groove at one end away from the sleeve, and one end surface of the knife groove is the third positioning surface;

[0025] The device body is provided with a positioning protrusion, one end surface of the positioning protrusion is the third positioning matching surface, and the positioning protrusion is arranged in the knife groove during assembly and positioning;

[0026] The third positioning surface and the third positioning matching surface are fitted together to achieve axial positioning of the outer knife tube.

[0027] According to an embodiment of the present invention, the third positioning surface is an end surface of the knife groove close to the sleeve, and the third positioning matching surface is an end surface of the positioning protrusion close to the sleeve.

[0028] According to an embodiment of the present invention, a first rotation positioning portion is provided between the sleeve and the device body, and the sleeve is fixed by self-rotation on the device body through the first rotation positioning portion.

[0029] According to an embodiment of the present invention:

[0030] The first rotation positioning portion includes a second positioning surface and a second positioning matching surface;

[0031] The second positioning surface is provided on the outer wall of the sleeve;

[0032] A positioning groove is provided on one side of the first arc groove away from its opening, and a side end surface of the positioning groove is the second positioning matching surface;

[0033] The second positioning surface and the second positioning matching surface are fitted together to achieve the self-rotation fixation of the sleeve on the device body.

[0034] According to an embodiment of the present invention, a second rotation positioning portion is provided between the outer knife tube and the device body, and the outer knife tube is fixed in rotation on the device body through the second rotation positioning portion.

[0035] According to an embodiment of the present invention:

[0036] The second rotation positioning portion includes a fourth positioning surface and a fourth positioning matching surface;

[0037] The fourth positioning surface is the two side surfaces of the knife groove;

[0038] The fourth positioning matching surface is the two side surfaces of the positioning protrusion;

[0039] The fourth positioning surface and the fourth positioning matching surface are fitted together to achieve the self-rotation fixation of the outer knife tube on the device body.

[0040] According to an embodiment of the present invention, the protruding end of the positioning protrusion is a third arc surface having the same diameter as the inner wall of the outer knife tube, and the third arc surface fits against the inner wall of the outer knife tube during assembly and positioning.

[0041] According to an embodiment of the present invention, the device body is provided with a positioning plane on both sides of the positioning protrusion, and the end surface of the opening end of the knife groove is in contact with the positioning plane during assembly.

[0042] According to an embodiment of the present invention, the sleeve is provided with a positioning mark, and the positioning mark is directly opposite to the knife groove.

[0043] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0044] (1) In the embodiment of the present invention, the coaxial assembly positioning between the sleeve and the outer knife tube is achieved by the first positioning portion and the second positioning portion, so that the sleeve and the outer knife tube can be assembled together with high precision, and the axes of the sleeve and the outer knife tube are coincident, thereby reducing the amplitude of the outer knife tube in the radial direction during surgery, so as to achieve the purpose of alleviating the patient's pain.

[0045] (2) In the embodiment of the present invention, the sleeve and the outer blade tube can be axially fixed on the device body through the first axial positioning portion and the second axial positioning portion, and the sleeve and the outer blade tube are further positioned, making the assembly more precise.

[0046] (3) In the embodiment of the present invention, the first rotation positioning portion and the second rotation positioning portion prevent the sleeve and the outer blade tube from rotating during assembly, making the assembly more accurate.

[0047] (4) In the embodiment of the present invention, the protruding end of the positioning protrusion is a third arc surface. During assembly, the third arc surface fits against the inner wall of the outer knife tube, making the outer knife tube more stable during assembly. Since the outer knife tube is relatively long, adding a fixing point can make it more stable.

[0048] (5) In the embodiment of the present invention, a positioning plane is provided on both sides of the positioning protrusion of the device body. During assembly, the open end surface of the knife groove fits with the positioning plane, making the outer knife tube more stable during assembly and preventing the outer knife tube from rotating during assembly, thereby further ensuring assembly accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0050] Figure 1 It is an isometric view of the device body of the present invention;

[0051] Figure 2 It is a front view of the device body of the present invention;

[0052] Figure 3 It is a left side view of the device body of the present invention;

[0053] Figure 4 It is an axonometric view of the sleeve of the present invention;

[0054] Figure 5 It is a schematic diagram of the outer knife tube of the present invention when being inserted into the sleeve;

[0055] Figure 6 For the present invention Figure 5 Partial cross-sectional view cut along section line AA;

[0056] Figure 7 It is a front view of the sleeve and the outer knife tube of the present invention when they are assembled on the device body;

[0057] Figure 8 It is a top view of the sleeve and the outer knife tube of the present invention when they are assembled on the device body;

[0058] Fig. 9 It is a right side view of the sleeve and the outer knife tube of the present invention when they are assembled on the device body.

[0059] Description of reference numerals:

[0060] 1: sleeve; 2: mounting hole; 3: first arc surface; 4: outer knife tube; 5: knife groove; 6: second arc surface; 7: device body; 8: first arc groove; 9: second arc groove; 10: first positioning surface; 11: positioning flange; 12: first positioning mating surface; 13: assembly window; 14: second positioning surface; 15: second positioning mating surface; 16: positioning groove; 17: third positioning surface; 18: third positioning mating surface; 19: positioning protrusion; 20: fourth positioning surface; 21: fourth positioning mating surface; 22: third arc surface; 23: positioning plane; 24: positioning mark. DETAILED DESCRIPTION

[0061] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0062] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0063] See also Figures 1 to 9 The core of the present invention is to provide a biopsy needle puncture outer knife tube assembly positioning device, which is used to realize the assembly of the sleeve 1 and the outer knife tube 4, including a device body 7, on which a first positioning portion for positioning the sleeve 1 and a second positioning portion for positioning the outer knife tube 4 are provided, and the first positioning portion and the second positioning portion are located in the same axial direction;

[0064] After the sleeve 1 and the outer knife tube 4 are pre-installed, they are placed on the device body 7, with the sleeve 1 placed on the first positioning portion and the outer knife tube 4 placed on the second positioning portion to achieve coaxial assembly positioning between the sleeve 1 and the outer knife tube 4 for subsequent fixed connection.

[0065] The coaxial assembly positioning between the sleeve and the outer knife tube is achieved by the first positioning portion and the second positioning portion, so that the sleeve and the outer knife tube can be assembled together with high precision, and the axes of the sleeve and the outer knife tube are made to coincide, thereby reducing the amplitude of the outer knife tube in the radial direction during surgery, so as to achieve the purpose of alleviating the patient's pain.

[0066] The biopsy needle puncture outer knife tube assembly positioning device of the present invention is described in detail below:

[0067] The sleeve 1 is provided with a mounting hole 2 along its central axis, and a positioning flange 11 is provided at one end of the sleeve 1 where the mounting hole 2 opens. A first arc surface 3 is provided on the outer wall of the sleeve 1, and the first arc surface 3 is two arc surfaces symmetrically arranged on the outer wall of the sleeve 1 with the same center, that is, the first arc surface 3 is divided into two symmetrical parts.

[0068] The outer wall of the sleeve 1 is also provided with a second positioning surface 14, which is two surfaces symmetrically arranged on the outer wall of the sleeve 1, that is, the second positioning surface 14 is also divided into two symmetrical parts, and the two symmetrical parts of the second positioning surface 14 are respectively adjacent to the two symmetrical parts of the first arc surface 3. A positioning mark 24 is also provided at the center position of the outer wall of the sleeve 1.

[0069] One end of the outer knife tube 4 is provided with a knife groove 5, and the knife groove 5 is connected to the inside of the outer knife tube 4. During assembly, the positioning mark 24 on the sleeve 1 is aligned with the knife groove 5, so that the position of the knife groove 5 can be determined according to the position of the positioning mark 24. The other end of the outer knife tube 4 is used to be inserted into the mounting hole 2 of the sleeve 1 during pre-assembly. The outer wall of the outer knife tube 4 is provided with a second arc surface 6.

[0070] The device body 7 is provided with a first arc groove 8, an assembly window 13, a second arc groove 9 and a positioning protrusion 19 in sequence from one end to the other end thereof, and the first arc groove 8 and the second arc groove 9 are coaxially arranged, the first arc groove 8 has the same diameter as the first arc surface 3, and the second arc groove 9 has the same diameter as the second arc surface 6. The assembly window 13 is used to provide an operating space when the outer knife tube 4 and the sleeve 1 are fixed.

[0071] A positioning groove 16 is provided on the side of the first arc groove 8 away from the opening thereof, that is, another positioning groove 16 is provided at the bottom of the first arc groove 8, and the positioning groove 16 divides the first arc groove 8 into two symmetrical parts. The part of the sleeve 1 where the second positioning surface 14 is provided matches the shape of the positioning groove 16.

[0072] In a preferred embodiment, the protruding end of the positioning protrusion 19 is a third arc surface 22 having the same diameter as the inner wall of the outer knife tube 4 , and the third arc surface 22 is coaxial with the first arc groove 8 .

[0073] In another preferred embodiment, the device body 7 is provided with a positioning plane 23 on both sides of the positioning protrusion 19 .

[0074] The first positioning portion is a first arc groove 8 provided on the device body 7, and the second positioning portion is a second arc groove 9 provided on the device body 7. During assembly, first insert the end of the outer knife tube 4 away from the knife groove 5 into the mounting hole 2 on the sleeve 1 and insert it to the bottom, then place the sleeve 1 and the outer knife tube 4 in the first arc groove 8 and the second arc groove 9 respectively, and insert the positioning protrusion 19 into the knife groove 5.

[0075] The first arc surface 3 on the sleeve 1 is made to fit with the groove surface of the first arc groove 8, so that the sleeve 1 is radially fixed on the device body 7; at the same time, the second arc surface 6 on the outer knife tube 4 is made to fit with the groove surface of the second arc groove 9, so that the outer knife tube 4 is radially fixed on the device body 7. And because the first arc groove 8 and the second arc groove 9 are coaxial, the axes of the outer knife tube 4 and the sleeve 1 coincide, so that the sleeve 1 and the outer knife tube 4 can be assembled together with high precision, and the amplitude of the outer knife tube 4 in the radial direction during surgery is reduced, so as to achieve the purpose of alleviating the pain of the patient.

[0076] A first axial positioning portion is provided between the sleeve 1 and the device body 7; a second axial positioning portion is provided between the outer knife tube 4 and the device body 7; the sleeve 1 and the outer knife tube 4 are axially fixed on the device body 7 through the first axial positioning portion and the second axial positioning portion respectively.

[0077] Specifically, the first axial positioning portion includes a first positioning surface 10 and a first positioning matching surface 12; the first positioning surface 10 is an end surface of the positioning flange 11 close to the sleeve 1, and the first positioning matching surface 12 is an end surface of the assembly window 13 close to the first arc groove 8. The axial positioning of the sleeve 1 is achieved by moving and adjusting the sleeve 1 to make the first positioning surface 10 fit with the first positioning matching surface 12.

[0078] The second axial positioning portion includes a third positioning surface 17 and a third positioning matching surface 18. The third positioning surface 17 is an end surface of the knife groove 5 close to the sleeve 1, and the third positioning matching surface 18 is an end surface of the positioning protrusion 19 close to the sleeve 1. The axial positioning of the outer knife tube 4 is achieved by moving and adjusting the outer knife tube 4 so that the third positioning surface 17 and the third positioning matching surface 18 fit together.

[0079] A first rotation positioning portion is provided between the sleeve 1 and the device body 7 , and the sleeve 1 is fixed in rotation on the device body 7 through the first rotation positioning portion.

[0080] Specifically, the first rotational positioning portion includes a second positioning surface 14 and a second positioning matching surface 15. The second positioning surface 14 is arranged on the sleeve 1. The second positioning matching surface 15 is the two side end surfaces of the positioning groove 16. During assembly and positioning, the second positioning surface 14 is fitted with the second positioning matching surface 15 to fix the sleeve 1 in rotation on the device body 7.

[0081] A second rotation positioning portion is provided between the outer knife tube 4 and the device body 7 , and the outer knife tube 4 is fixed in rotation on the device body 7 through the second rotation positioning portion.

[0082] Specifically, the second rotational positioning portion includes a fourth positioning surface 20 and a fourth positioning matching surface 21. The fourth positioning surface 20 is the two side surfaces of the knife groove 5, and the fourth positioning matching surface 21 is the two side surfaces of the positioning protrusion 19. During assembly and positioning, the two side surfaces of the positioning protrusion 19 are respectively fitted with the two side surfaces of the knife groove 5 to allow the outer knife tube 4 to rotate and be fixed on the device body 7.

[0083] Furthermore, during assembly and positioning, the third arc surface 22 of the protruding end of the positioning protrusion 19 fits against the inner wall of the outer knife tube 4, making the outer knife tube 4 more stable during assembly. Because the outer knife tube 4 is longer, adding a fixed point can make it more stable, and the third arc surface 22 is coaxial with the first arc groove 8, further ensuring the coaxiality of the sleeve 1 and the outer knife tube 4.

[0084] The open end surface of the knife groove 5 of the outer knife tube 4 is in contact with the positioning plane 23, so that the outer knife tube 4 is more stable during assembly, and the outer knife tube 4 is further prevented from rotating during assembly, thereby further ensuring assembly accuracy.

[0085] The assembly process of the present invention is further described below:

[0086] First, insert the end of the outer blade tube 4 away from the blade groove 5 into the mounting hole 2 on the sleeve 1 and insert it to the bottom, and make the positioning mark 24 on the sleeve 1 face the blade groove 5 to achieve pre-assembly. Figure 5 shown.

[0087] Then adjust the positions of the outer knife tube 4 and the sleeve 1 to match them with the device body 7, and then put the outer knife tube 4 and the sleeve 1 into the device body 7 as a whole, so that the first arc surface 3 on the sleeve 1 fits with the groove surface of the first arc groove 8, the second positioning surface 14 on the sleeve 1 fits with the second positioning matching surface 15 of the positioning groove 16, and the first positioning surface 10 on the positioning flange 11 fits with the first positioning matching surface 12 of the assembly window 13.

[0088] At the same time, the second arc surface 6 on the outer knife tube 4 is fitted with the groove surface of the second arc groove 9, the positioning protrusion 19 is inserted into the knife groove 5, the third positioning surface 17 on the knife groove 5 is fitted with the third positioning matching surface 18 of the positioning protrusion 19, the fourth positioning surfaces 20 on both sides of the knife groove 5 are fitted with the fourth positioning matching surfaces 21 on both sides of the positioning protrusion 19, the third arc surface 22 at the protruding end of the positioning protrusion 19 is fitted with the inner wall of the outer knife tube 4, and the end face of the opening end of the knife groove 5 is fitted with the positioning plane 23.

[0089] The above measures ensure the coaxiality of the sleeve 1 and the outer knife tube 4, and make the sleeve 1 and the outer knife tube 4 fixed on the device body 7 in radial, axial and rotational directions.

[0090] After being fixed, measures are taken from the assembly window 13 of the device body 7 to fix the outer knife tube 4 and the sleeve 1, for example, the outer knife tube 4 and the sleeve 1 are fixed together by gluing.

[0091] If the assembly of the outer blade tube 4 and the sleeve 1 cannot be embedded in the device body 7 during the assembly process, it means that the assembly is unqualified and not assembled in place, and needs to be reworked and fixed again.

[0092] The biopsy needle puncture outer knife tube assembly positioning device of the present invention has the following advantages:

[0093] 1. It can detect whether the outer knife tube 4 and the sleeve 1 are properly assembled. The distance between the third positioning surface 17 of the knife groove 5 of the outer knife tube 4 and the first positioning surface 10 of the positioning flange 11 of the sleeve 1 can be used to check whether the outer knife tube 4 and the sleeve 1 are properly assembled. It can also be replaced by the distance between other surfaces of the knife groove 5 of the outer knife tube 4 and a certain point of the sleeve 1. The length of the semi-finished product of the outer knife tube 4 and the sleeve 1 is unified, which is convenient for controlling the depth of the knife head entering the tissue during surgery and improving the surgical accuracy.

[0094] 2. Ensure that the center plane of the knife groove 5 of the outer knife tube 4 coincides with the center plane of the positioning mark 24 on the sleeve 1 to improve surgical accuracy. The mark on the outer knife tube 4 fixed sleeve 1 is oriented vertically upward, and the angle of the outer knife tube 4 rotating around its axis is zero. If the center plane of the knife groove 5 of the outer knife tube 4 deviates too much from the center plane of the positioning mark 24 on the sleeve 1, it will cause a large error when adjusting the biopsy needle puncture notch to face the tumor tissue during surgery, thereby reducing surgical accuracy.

[0095] 3. Ensure that the axis of the outer knife tube 4 coincides with the axis of the sleeve 1 to ensure coaxiality and improve surgical accuracy. If the axis of the outer knife tube 4 does not coincide with the axis of the sleeve 1 or the deviation is large, the radial amplitude of the outer knife tube 4 will be too large during surgery, which will increase the patient's pain and reduce the user experience.

[0096] 4. It can eliminate processing errors and assembly errors and improve accuracy.

[0097] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A biopsy needle puncture outer knife tube assembly and positioning device, used to realize the assembly of the sleeve and the outer knife tube, characterized in that: The device comprises a device body, wherein the device body is provided with a first positioning portion for positioning the sleeve and a second positioning portion for positioning the outer knife tube, and the first positioning portion and the second positioning portion are located in the same axial direction; After the sleeve and the outer knife tube are pre-mounted, they are placed on the device body, with the sleeve placed on the first positioning portion and the outer knife tube placed on the second positioning portion, so as to achieve coaxial assembly and positioning between the sleeve and the outer knife tube for subsequent fixed connection; The first positioning portion is a first arc groove provided on the device body, the outer wall of the sleeve is provided with a first arc surface, and the diameter of the first arc surface is the same as that of the first arc groove; The second positioning portion is a second arc groove provided on the device body, the second arc groove and the first arc groove are coaxially arranged, the outer wall of the outer knife tube is provided with a second arc surface, and the diameter of the second arc surface is the same as that of the second arc groove; During assembly and positioning, the first arc surface is fitted with the first arc groove surface, and the second arc surface is fitted with the second arc groove surface; A first axial positioning portion is provided between the sleeve and the device body; A second axial positioning portion is provided between the outer knife tube and the device body; The sleeve and the outer knife tube are axially fixed on the device body through the first axial positioning portion and the second axial positioning portion respectively; A first rotation positioning portion is provided between the sleeve and the device body, and the sleeve is fixed on the device body by self-rotation through the first rotation positioning portion; The first rotation positioning portion includes a second positioning surface and a second positioning matching surface; The second positioning surface is provided on the outer wall of the sleeve; A positioning groove is provided on one side of the first arc groove away from its opening, and a side end surface of the positioning groove is the second positioning matching surface; The second positioning surface and the second positioning matching surface are fitted together to achieve the self-rotation fixation of the sleeve on the device body.

2. The biopsy needle puncture outer blade tube assembly and positioning device according to claim 1, characterized in that: The first axial positioning portion includes a first positioning surface and a first positioning matching surface; The sleeve is provided with a positioning flange, and one end surface of the positioning flange is the first positioning surface; The device body is provided with an assembly window, and one end surface of the assembly window is the first positioning matching surface; The first positioning surface is fitted with the first positioning matching surface to achieve axial positioning of the sleeve.

3. The biopsy needle puncture outer blade tube assembly and positioning device according to claim 2, characterized in that: The sleeve is provided with a mounting hole, the positioning flange is provided at one end of the sleeve where the mounting hole opens, and the first positioning surface is an end surface of the positioning flange close to the sleeve.

4. The biopsy needle puncture outer blade tube assembly and positioning device according to claim 1, characterized in that: The second axial positioning portion includes a third positioning surface and a third positioning matching surface; The outer knife tube is provided with a knife groove at one end away from the sleeve, and one end surface of the knife groove is the third positioning surface; The device body is provided with a positioning protrusion, one end surface of the positioning protrusion is the third positioning matching surface, and the positioning protrusion is arranged in the knife groove during assembly and positioning; The third positioning surface and the third positioning matching surface are fitted together to achieve axial positioning of the outer knife tube.

5. The biopsy needle puncture outer blade tube assembly and positioning device according to claim 4, characterized in that: The third positioning surface is an end surface of the knife groove close to the sleeve, and the third positioning matching surface is an end surface of the positioning protrusion close to the sleeve.

6. The biopsy needle puncture outer blade tube assembly and positioning device according to claim 4, characterized in that: A second rotation positioning portion is provided between the outer knife tube and the device body, and the outer knife tube is fixed on the device body by self-rotation through the second rotation positioning portion.

7. The biopsy needle puncture outer blade tube assembly and positioning device according to claim 6, characterized in that: The second rotation positioning portion includes a fourth positioning surface and a fourth positioning matching surface; The fourth positioning surface is the two side surfaces of the knife groove; The fourth positioning matching surface is the two side surfaces of the positioning protrusion; The fourth positioning surface and the fourth positioning matching surface are fitted together to achieve the self-rotation fixation of the outer knife tube on the device body.

8. The biopsy needle puncture outer blade tube assembly and positioning device according to claim 4, characterized in that: The protruding end of the positioning protrusion is a third arc surface with the same diameter as the inner wall of the outer knife tube. During assembly and positioning, the third arc surface fits against the inner wall of the outer knife tube.

9. The biopsy needle puncture outer blade tube assembly and positioning device according to claim 4, characterized in that: The device body is provided with a positioning plane on both sides of the positioning protrusion, and the end surface of the opening end of the knife groove is in contact with the positioning plane during assembly.

10. The biopsy needle puncture outer blade tube assembly and positioning device according to claim 4, characterized in that: The sleeve is provided with a positioning mark, and the positioning mark is directly opposite to the knife groove.

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