Biopsy needle and biopsy sampling device

Abstract

The utility model relates to a kind of biopsy needle and biopsy sampling device, the farthest end of inner cutter tube is inserted into internal passage after passing through guide passage along insertion direction, to realize the assembly connection between inner cutter tube and outer cutter tube. Since the diameter of the tapered section of the guide passage gradually decreases along the insertion direction until the diameter at the farthest end matches the outer diameter of the inner cutter tube, the inner cutter tube and the guide sleeve are in line contact. Even if there is a deviation between the center axis of the inner cutter tube and the center axis of the outer cutter tube, and the amplitude of the inner cutter tube is large, no additional resonance cavity will be generated, and abnormal noise can be effectively eliminated.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a biopsy needle and a biopsy sampling device. Background Technology

[0002] The biopsy needle includes an outer tube and an inner tube. The outer tube has a sampling window on its outer wall near the front end. The inner tube is partially inserted into the outer tube. The inner tube can rotate relative to the outer tube around its axis and can move along the axial direction of the outer tube to cut the tissue that is sucked into the outer tube through the sampling window.

[0003] In traditional biopsy needles, a guide sleeve is located near the proximal end of the outer blade. The inlet end of the guide sleeve is chamfered to guide the inner blade into the outer blade. During sampling, the tip of the inner blade passes through the guide sleeve before entering the outer blade, and the inner blade rotates at high speed throughout the feeding process. Due to assembly and manufacturing errors, there is a deviation between the central axis of the inner and outer blades, resulting in significant vibration of the inner blade and generating abnormal noise. Utility Model Content

[0004] Therefore, it is necessary to provide a biopsy needle and biopsy device to address the technical problem of abnormal noise generated by the biopsy needle during the sampling process.

[0005] The technical solution is as follows:

[0006] On the one hand, a biopsy needle is provided, comprising:

[0007] An outer blade tube, wherein the outer blade tube is provided with an internal channel extending axially;

[0008] An inner blade tube, rotatably inserted into the internal channel and movable along the internal channel; and

[0009] A guide sleeve is disposed at the proximal end of the outer blade tube. The guide sleeve has a guide channel that communicates with the internal channel. The guide channel has a tapered section whose diameter gradually decreases along the insertion direction of the inner blade tube into the guide sleeve. The diameter of the tapered section at its farthest end matches the outer diameter of the inner blade tube, and the diameter of the guide channel at all other points is greater than the diameter of the tapered section at its farthest end.

[0010] The technical solution will be further explained below:

[0011] In one embodiment, the entire guide channel forms the tapering section from its proximal end to its farthest end.

[0012] In one embodiment, the tapered section has a guide cone surface whose diameter gradually decreases along the insertion direction.

[0013] In one embodiment, the biopsy needle further includes a mounting sleeve, a portion of which is fitted onto the proximal end of the outer blade tube, and another portion of which is fitted onto the outer side wall of the guide sleeve.

[0014] The guide sleeve and the mounting sleeve are fixed relative to each other; or, the mounting sleeve and the guide sleeve are clearance-fitted so that the guide sleeve can move radially relative to the mounting sleeve.

[0015] In one embodiment, the gap between the mounting sleeve and the guide sleeve is L, wherein 0.035mm≤L≤0.08mm.

[0016] In one embodiment, the proximal end of the outer blade tube is further provided with a flared structure, the inner diameter of which decreases along the insertion direction until it communicates with the internal channel.

[0017] In one embodiment, the biopsy needle further includes a housing, the proximal end of the outer blade tube and the guide sleeve are both disposed within the housing, the mounting sleeve has a first positioning part, the housing is provided with a second positioning part, and the guide sleeve is at least partially positioned between the first positioning part and the second positioning part along the axial direction.

[0018] In one embodiment, the first positioning part is disposed on the inner side wall of the mounting sleeve, and the outer side wall of the guide sleeve is provided with a third positioning part, wherein the first positioning part and the third positioning part are positioned and engaged.

[0019] In one embodiment, the first positioning part includes a positioning step, and the third positioning part includes a positioning end face, the positioning end face being fitted and limited to the positioning step surface.

[0020] On the other hand, a biopsy sampling device is provided, including a biopsy handle and the biopsy needle, wherein the biopsy needle is adapted to the biopsy needle.

[0021] In the biopsy needle and biopsy sampling device of the above embodiment, during the sampling process, the farthest end of the inner blade tube passes through the guide channel along the insertion direction and is inserted into the inner channel. Since the diameter of the tapered section of the guide channel gradually decreases along the insertion direction until the diameter at the farthest end of the tapered section matches the outer diameter of the inner blade tube, and the diameter at all other points of the guide channel is larger than the diameter at the farthest end of the tapered section, the inner blade tube and the guide sleeve are in line contact. Even if there is a deviation between the central axis of the inner blade tube and the central axis of the outer blade tube, and the amplitude of the inner blade tube is large, a resonance cavity will not be formed between the guide sleeve and the inner blade tube, which can effectively reduce or even eliminate abnormal noise. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A partial sectional view of the assembly of the outer blade, guide sleeve, mounting sleeve and inner blade of a biopsy needle according to one embodiment;

[0025] Figure 2 for Figure 1 A magnified view of part C of the biopsy needle;

[0026] Figure 3 A partial cross-sectional view of the assembly of the outer blade, guide sleeve, mounting sleeve, and inner blade of a biopsy needle according to another embodiment.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100. Outer blade; 110. Internal channel; 120. Flared structure; 200. Guide sleeve; 210. Guide channel; 211. Guide cone surface; 220. Third positioning part; 300. Mounting sleeve; 310. First positioning part; 400. Housing; 410. Second positioning part; 500. Inner blade. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0030] In traditional biopsy needles, the inlet end of the guide sleeve is chamfered to guide the inner blade through the guide sleeve into the outer blade. During sampling, the blade tip of the inner blade first passes through the guide sleeve and then enters the outer blade, rotating at high speed throughout the entire feeding process. Due to assembly and manufacturing errors, there is a deviation between the central axis of the inner blade and the central axis of the outer blade. This creates a significant resonance cavity on the inner wall of the guide sleeve and the outer wall of the inner blade, resulting in a large amplitude of vibration in the inner blade and generating abnormal noise.

[0031] To reduce or even eliminate abnormal noise, such as Figure 1 As shown, in one embodiment, a biopsy sampling device is provided, which includes a biopsy handle and a biopsy needle. During the sampling process, the biopsy handle can be held while the biopsy needle is used to take a sample from the affected area. Furthermore, the biopsy needle does not produce any abnormal noise during use.

[0032] It should be noted that the biopsy handle can be an existing device, which will not be elaborated here.

[0033] like Figure 1 and Figure 3 As shown, in one embodiment, a biopsy needle is provided, including an outer blade 100, an inner blade 500, and a guide sleeve 200.

[0034] The outer blade tube 100 is provided with an internal channel 110 extending along the axial direction.

[0035] The inner blade tube 500 is rotatably inserted into the inner channel 110, and the inner blade tube 500 can move along the inner channel 110, that is, the inner blade tube 500 can move axially relative to the outer blade tube 100 within the inner channel 110.

[0036] The guide sleeve 200 is disposed at the proximal end of the outer blade tube 100. Furthermore, the guide sleeve 200 has a guide channel 210 that communicates with the internal channel 110. Moreover, the guide channel 210 has an insertion direction (e.g., along the inner blade tube 500 into the guide sleeve 200) for inserting into the guide sleeve 200. Figure 1 and Figure 3 (as shown in direction A) Diameter (e.g.) Figure 1 The guide channel 210 (as shown in R1) gradually decreases in diameter, with the diameter at its furthest point matching the outer diameter of the inner tube 500. Furthermore, the diameter of the guide channel 210 at all other points is larger than the diameter at the furthest point of the tapered section, meaning that the inner diameter of the guide channel 210 gradually decreases along the insertion direction to be equal to or approximately equal to the outer diameter of the inner tube 500.

[0037] It should be noted that in this embodiment, the proximal end refers to the end furthest from the blade tip, and correspondingly, the farthest end refers to the end closest to the blade tip. Additionally, it should be noted that "all other parts of the guide channel 210" in the above description refers to all other sections of the guide channel 210 except for the tapering section.

[0038] In the biopsy needle of the above embodiment, during the sampling process, the farthest end of the inner tube 500 passes through the guide channel 210 along the insertion direction and is inserted into the inner channel 110. Since the diameter of the tapered section of the guide channel 210 gradually decreases along the insertion direction until the diameter at the farthest end of the tapered section matches the outer diameter of the inner tube 500, and the diameter at all other points of the guide channel is larger than the diameter at the farthest end of the tapered section, the inner tube 500 and the guide sleeve 200 are in line contact. Even if there is a deviation between the central axis of the inner tube 500 and the central axis of the outer tube 100, and the amplitude of the inner tube 500 is large, a resonance cavity will not be formed between the guide sleeve 200 and the inner tube 500, which can effectively reduce or even eliminate abnormal noise.

[0039] It should be noted that the inner blade tube 500 and the guide sleeve 200 are in line contact. This can be achieved by the proximal end of the guide channel 210 being cylindrical and the distal end being a tapered surface with a gradually decreasing diameter along the insertion direction; or by the proximal end of the guide channel 210 being a tapered surface with a gradually decreasing diameter along the insertion direction, while the distal end is a tapered surface with a gradually increasing diameter. In this case, the smallest diameter part of the entire guide channel 210 is located in the middle region of the guide channel 210. Of course, the guide channel 210 can also adopt other methods, as long as the inner blade tube 500 and the guide sleeve 200 are in line contact during the sampling process.

[0040] In addition, the statement that "the diameter of the tapered section at its farthest end matches the outer diameter of the inner tube 500" can be understood as the diameter of the tapered section at its farthest end being slightly larger than the outer diameter of the inner tube 500, allowing the inner tube 500 to pass through, and also helping to reduce the amplitude of the inner tube.

[0041] In one embodiment, the entire guide channel 210 forms a tapering section from its proximal end to its distal end. This ensures that the entire guide channel 210 makes line contact with the inner knife tube 500, effectively preventing the formation of a resonance cavity and effectively eliminating abnormal noise.

[0042] like Figures 1 to 3 As shown, in one embodiment, the tapered section has a guide cone surface 211, the diameter of which (e.g.) Figure 1 As shown in R1, the inner diameter of the guide cone 211 gradually decreases along the insertion direction, that is, the inner diameter of the guide cone 211 gradually decreases along the insertion direction to be slightly larger than the outer diameter of the inner knife tube 500. This ensures that the guide cone 211 makes line contact with the inner knife tube 500 at its furthest point near the guide sleeve 200, while the guide cone 211 is spaced apart from the inner knife tube 500 at other positions, effectively avoiding the formation of a resonance cavity and effectively eliminating abnormal noise. Furthermore, the design of the guide cone 211 provides reliable guidance for the inner knife tube 500 as it is inserted into the internal channel 110.

[0043] like Figures 1 to 3As shown, in one embodiment, the biopsy needle further includes an mounting sleeve 300. A portion of the mounting sleeve 300 is fitted onto the proximal end of the outer blade tube 100, and another portion of the mounting sleeve 300 is fitted onto the outer side wall of the guide sleeve 200, thereby achieving the assembly connection between the mounting sleeve 300 and the outer blade tube 100 and the guide sleeve 200, and realizing the initial positioning assembly between the guide sleeve 200 and the outer blade tube 100. The guide sleeve 200 and the mounting sleeve 300 can be relatively fixed to avoid relative movement. Alternatively, the mounting sleeve 300 and the guide sleeve 200 can be clearance-fitted, allowing the guide sleeve 200 to move radially relative to the mounting sleeve 300. Traditionally, the mounting sleeve 300 and the guide sleeve 200 are assembled using sealant filling and bonding, resulting in no relative movement between them. In this embodiment, the clearance fit between the guide sleeve 200 and the mounting sleeve 300 allows the guide sleeve 200 to move radially relative to the mounting sleeve 300 (e.g., ...). Figure 1 The jumping (as shown in direction B) can release and absorb the energy of friction resonance and torque force, which is beneficial to eliminate or reduce abnormal noise or make the noise uniform.

[0044] like Figure 2 As shown, in one embodiment, the gap between the mounting sleeve 300 and the guide sleeve 200 is L, where 0.035mm ≤ L ≤ 0.08mm. For example, L can take values ​​such as 0.035mm, 0.04mm, 0.045mm, 0.05mm, 0.055mm, 0.06mm, 0.065mm, 0.07mm, 0.075mm, and 0.08mm, or any other value between 0.035mm and 0.08mm. This ensures that the gap between the mounting sleeve 300 and the guide sleeve 200 is appropriate, allowing the guide sleeve 200 to radially run relative to the mounting sleeve 300, thus releasing and absorbing the energy of frictional resonance and off-center torque. It also avoids affecting assembly quality and accuracy due to excessive gap.

[0045] like Figure 3 As shown, in one embodiment, the proximal end of the outer blade tube 100 is further provided with a flared structure 120. Furthermore, the inner diameter of the flared structure 120 (e.g., Figure 3 The flared structure 120 decreases along the insertion direction (as shown in R2) until it communicates with the internal channel 110. Furthermore, the flared structure 120 can be fitted with the mounting sleeve 300 along the insertion direction. Thus, the flared structure 120 can provide secondary guidance for the insertion of the inner knife tube 500 into the internal channel 110, correcting any deviation in the guide channel 210.

[0046] Optionally, the flared structure 120 can be in the shape of a trumpet.

[0047] like Figure 1 As shown, in one embodiment, the biopsy needle further includes a housing 400. The proximal end of the outer blade 100 and the guide sleeve 200 are both disposed within the housing. The mounting sleeve 300 has a first positioning portion 310, and the housing 400 has a second positioning portion 410. The guide sleeve 200 is at least partially positioned between the first positioning portion 310 and the second positioning portion 410 along the axial direction. Thus, the axial positioning of the guide sleeve 200 is achieved by the first positioning portion 310 and the second positioning portion 410.

[0048] It is worth mentioning that the axial limit here can mean that the guide sleeve 2000 is completely limited and cannot move, or it can mean that the range of motion of the guide sleeve 200 is restricted. For example, in Figure 1 , Figure 3 In the illustrated embodiment, the first positioning part 310 and the second positioning part 410 axially limit the guide sleeve 200 to prevent it from moving axially. In another embodiment, provided that the guide sleeve 200 and the mounting sleeve 300 are in clearance fit, the first positioning part 310 and the second positioning part 410 can also be used to allow the guide sleeve 200 to move slightly within a certain range between them, so that the resonant energy can be quickly released through the moving guide sleeve 200, which is more conducive to eliminating or reducing abnormal noise or making the noise uniform.

[0049] like Figure 2 As shown, in one embodiment, a first positioning part 310 is disposed on the inner sidewall of the mounting sleeve 300, and a third positioning part 220 is disposed on the outer sidewall of the guide sleeve 200. The first positioning part 310 and the third positioning part 220 are positioned and engaged. Thus, the positioning and limiting between the first positioning part 310 and the third positioning part 220 improves the assembly accuracy of the mounting sleeve 300 and the guide sleeve 200, and also ensures that the guide sleeve 200 is positioned at the tail end of the outer knife tube 100, thereby ensuring that the guide channel 210 and the insertion channel 110 are correspondingly connected.

[0050] The positioning engagement between the first positioning part 310 and the second positioning part 220 can be achieved through a plug-in engagement or a contact engagement, as long as the guide sleeve 200 is positioned at the tail end of the outer knife tube 100 so that the guide channel 210 and the internal channel 110 are correspondingly connected.

[0051] In one embodiment, the first positioning part 310 includes a positioning step, and the third positioning part 220 includes a positioning end face, which is engaged and limited with the positioning step surface. Thus, the assembly positioning and limiting of the mounting sleeve 300 and the guide sleeve 200 are achieved through the surface engagement between the positioning end face and the positioning step, which is simple, convenient, reduces assembly difficulty, and improves assembly accuracy.

[0052] It should be noted that "a certain body" or "a certain part" can be a portion of the corresponding "component," meaning that "a certain body" or "a certain part" is integrally formed and manufactured with the "other parts of the component"; or it can be an independent component that can be separated from the "other parts of the component," meaning that "a certain body" or "a certain part" can be manufactured independently and then combined with the "other parts of the component" to form a whole. The expression of "a certain body" or "a certain part" in this application is only one embodiment for ease of reading, and is not intended to limit the scope of protection of this application. Any technical solution that includes the above features and has the same function should be understood as an equivalent technical solution of this application.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0054] It should be noted that when a component is referred to as "fixed to," "set on," "fixed to," or "installed on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component. Furthermore, when a component is considered to be "fixed transmission connection" to another component, the two can be fixed in a detachable or non-detachable manner, as long as power transmission can be achieved. Methods such as socketing, snap-fitting, integral molding, and welding are feasible in existing technologies and will not be elaborated upon here. When a component is perpendicular or approximately perpendicular to another component, it means that the ideal state is perpendicularity, but due to manufacturing and assembly factors, a certain degree of perpendicularity error may exist.

[0055] It should also be understood that, in interpreting the connection or positional relationships of components, although not explicitly described, connection and positional relationships are interpreted to include a range of error, which should be within the acceptable deviation range of a specific value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A biopsy needle, characterized in that, include: An outer blade tube, wherein the outer blade tube is provided with an internal channel extending axially; An inner blade tube is rotatably inserted into the internal channel and is movable along the internal channel; as well as A guide sleeve is disposed at the proximal end of the outer blade tube. The guide sleeve has a guide channel that communicates with the internal channel. The guide channel has a tapered section whose diameter gradually decreases along the insertion direction of the inner blade tube into the guide sleeve. The diameter of the tapered section at its farthest end matches the outer diameter of the inner blade tube, and the diameter of the guide channel at all other points is greater than the diameter of the tapered section at its farthest end.

2. The biopsy needle according to claim 1, characterized in that, The entire guide channel forms the tapering section from its proximal end to its farthest end.

3. The biopsy needle according to claim 1, characterized in that, The tapered section has a guide cone surface, the diameter of which gradually decreases along the insertion direction.

4. The biopsy needle according to claim 1, characterized in that, The biopsy needle also includes a mounting sleeve, a portion of which is fitted onto the proximal end of the outer blade tube, and another portion of which is fitted onto the outer side wall of the guide sleeve. The guide sleeve and the mounting sleeve are fixed relative to each other; or, the mounting sleeve and the guide sleeve are clearance-fitted so that the guide sleeve can move radially relative to the mounting sleeve.

5. The biopsy needle according to claim 4, characterized in that, The gap between the mounting sleeve and the guide sleeve is L, wherein 0.035mm≤L≤0.08mm.

6. The biopsy needle according to claim 4, characterized in that, The proximal end of the outer blade tube is also provided with a flared structure, the inner diameter of which decreases along the insertion direction until it communicates with the internal channel.

7. The biopsy needle according to claim 4, characterized in that, The biopsy needle also includes a housing, the proximal end of the outer blade tube and the guide sleeve are both disposed in the housing, the mounting sleeve has a first positioning part, the housing is provided with a second positioning part, and the guide sleeve is at least partially located between the first positioning part and the second positioning part along the axial direction.

8. The biopsy needle according to claim 7, characterized in that, The first positioning part is provided on the inner side wall of the mounting sleeve, and the outer side wall of the guide sleeve is provided with a third positioning part, and the first positioning part and the third positioning part are positioned and engaged.

9. The biopsy needle according to claim 8, characterized in that, The first positioning part includes a positioning step, and the third positioning part includes a positioning end face, which is fitted and limited to the positioning step surface.

10. A biopsy sampling device, characterized in that, It includes a biopsy handle and a biopsy needle as described in any one of claims 1 to 9, wherein the biopsy needle is adapted to the biopsy needle.

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