biopsy needle

Abstract

The utility model provides a kind of biopsy needle, it is related to medical instrument technical field.The biopsy needle includes needle tube;The needle tube includes proximal end and distal end, from the proximal end to the distal end of needle tube, the tube body of needle tube is equipped with proximal end helical slit and distal end helical slit in turn, proximal end helical slit and distal end helical slit are helically extended along the axial direction of needle tube, and the pitch of distal end helical slit is less than the pitch of proximal end helical slit;Proximal end helical slit is multiple and the pitch of at least two proximal end helical slit is equal;The tube body of needle tube is covered with flexible sealing layer, and sealing layer extends from the proximal end of needle tube to the distal end of needle tube.The biopsy needle can improve the flexibility of needle tube by proximal end helical slit and distal end helical slit, so that biopsy needle is easy to bend deformation, can smoothly enter into small and curved cavity in human body and carry out biopsy sampling, and the sealing layer on needle tube, which extends from its proximal end to distal end, can effectively ensure the sealing property of needle tube.

Description

Technical Field

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

[0002] A biopsy needle is a medical device used for in vivo sampling. During use, the biopsy needle is first inserted into the patient's body through the working channel of an endoscope, and then puncture and aspirate through the biopsy needle to remove a certain amount of diseased tissue from the patient's body for pathological examination.

[0003] A biopsy needle has a distal end for entering the patient's body and a proximal end for entering the body. A biopsy needle usually consists of an outer tube, a needle tube, and a probe that are connected in sequence. The distal end of the needle tube is the needle tip, which is used for puncture. The probe is a rigid structure made of metal or alloy and its distal end extends beyond the needle tip.

[0004] However, existing biopsy needles generally have poor flexibility and are difficult to bend, making it difficult for the distal end of the biopsy needle to enter the small and curved cavities in the human body for biopsy sampling. Utility Model Content

[0005] The purpose of this invention is to provide a biopsy needle to alleviate the technical problem in the prior art where the distal part of the biopsy needle is usually not flexible and difficult to bend, making it difficult for the distal part of the biopsy needle to enter the small and curved cavities in the human body for biopsy sampling.

[0006] In a first aspect, this utility model provides a biopsy needle, including a needle tube; The needle tube includes a proximal end and a distal end. From the proximal end to the distal end of the needle tube, the body of the needle tube is provided with a proximal spiral slit and a distal spiral slit in sequence. Both the proximal spiral slit and the distal spiral slit extend spirally along the axial direction of the needle tube, and the pitch of the distal spiral slit is smaller than the pitch of the proximal spiral slit. The proximal helical cuts are multiple, and at least two of the proximal helical cuts have equal pitch; The syringe tube is covered with a flexible sealing layer, which extends from the proximal end of the syringe tube to the distal end of the syringe tube.

[0007] In an optional embodiment, an outer tube is further included, which is sleeved over the needle tube and extends from the inside to the outside of the outer tube. The outer tube includes a plurality of tube layers that are sequentially sleeved.

[0008] In an optional embodiment, at least one set of two adjacent tube layers are provided with a helical element, which extends helically along the axial direction of the outer tube to form a tubular protective layer.

[0009] In an optional embodiment, the spiral is flat and the flat surface of the spiral is parallel to the axial direction of the outer tube.

[0010] In an optional embodiment, the spiral component is made of metal or alloy.

[0011] In an optional embodiment, the outer tube includes a proximal end and a distal end, the outermost tube layer among the multiple tube layers of the outer tube is the outer tube layer, and the end of the spiral member near the distal end of the outer tube is located inside the outer tube layer.

[0012] In an optional embodiment, each layer of the outer tube is made of a polymer material.

[0013] In an optional embodiment, the distal end of the syringe is provided with a blade to form a needle tip, and the needle tip is covered with a rigid coating.

[0014] In an optional embodiment, a probe is further included, which is slidably mounted inside the needle tube.

[0015] In an optional embodiment, the probe is made of metal or alloy, the probe includes a proximal end and a distal end, the probe is covered with a flexible material layer, and the distal end of the probe extends beyond the flexible material layer.

[0016] The biopsy needle provided by this utility model includes a needle tube; the needle tube includes a proximal end and a distal end. From the proximal end to the distal end of the needle tube, the body of the needle tube is provided with a proximal spiral slit and a distal spiral slit in sequence. Both the proximal and distal spiral slits extend spirally along the axial direction of the needle tube, and the pitch of the distal spiral slit is smaller than the pitch of the proximal spiral slit; there are multiple proximal spiral slits, and at least two of the proximal spiral slits have equal pitches; the body of the needle tube is covered with a flexible sealing layer, and the sealing layer extends from the proximal end of the needle tube to the distal end of the needle tube. The biopsy needle provided by this utility model is used for live sampling of human bodies. The end of the biopsy needle used to enter the patient's body is the distal end, and the other end is the proximal end. The end of the needle tube near the distal end of the biopsy needle is its distal end, and the end of the needle tube near the proximal end of the biopsy needle is its proximal end. When using the biopsy needle provided by this invention to perform biopsy sampling on a human body, the distal end of the biopsy needle can be first inserted into the body cavity through the endoscope's working channel pre-installed within the body until the distal end of the biopsy needle reaches the target location within the cavity. The proximal end of the biopsy needle usually has an operating handle and does not need to enter the body. During the process of the biopsy needle entering the body, because the needle tube has proximal and distal spiral slits, the needle tube is easy to deform at the slits, thus improving its overall flexibility. Correspondingly, the flexibility of the biopsy needle is also improved, and the biopsy needle can easily bend and deform along the direction of the body cavity, thereby allowing the distal end of the biopsy needle to smoothly enter the small and curved cavities of the body for biopsy sampling. Furthermore, the biopsy needle provided by this invention features a larger pitch proximal helical slit near the proximal end of the needle tube and a smaller pitch distal helical slit near the distal end. This enhances the overall flexibility of the biopsy needle, further improving the flexibility near the distal end and thus improving the smoothness of distal insertion into the body. Simultaneously, it effectively ensures support near the proximal end to meet the rigidity requirements of the proximal end. Having multiple proximal helical slits, with at least two having equal pitch, further enhances the support near the proximal end, satisfying various rigidity requirements and effectively improving the biopsy needle's performance. Moreover, the biopsy needle provided by this invention features a flexible sealing layer covering the entire tube from proximal to distal end, sealing all helical slits and effectively improving the needle's sealing performance.

[0017] Compared with existing technologies, the biopsy needle provided by this invention improves the flexibility of the needle tube by setting proximal and distal spiral slits, making the needle easier to bend and deform, and allowing it to smoothly enter the small and curved cavities of the human body for biopsy sampling. The pitch of the distal spiral slit is smaller than that of the proximal spiral slit, which further improves the flexibility of the needle tube near its distal end while simultaneously enhancing the support of the needle tube near its proximal end. This satisfies the rigidity requirements of the proximal end of the needle tube, preventing the tube from being too flexible and affecting the effectiveness of the biopsy needle. Furthermore, the equal pitch of at least two proximal spiral slits further enhances the support of the biopsy needle near its proximal end, simultaneously meeting various rigidity requirements of the proximal end of the biopsy needle. In addition, the biopsy needle's sealing layer, which covers the entire area from the proximal to the distal end of the needle tube, effectively ensures the needle tube's airtightness. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A front view of the biopsy needle provided in an embodiment of this utility model; Figure 2 A partial structural schematic diagram of the biopsy needle provided in an embodiment of this utility model; Figure 3 This is another partial structural schematic diagram of the biopsy needle provided in an embodiment of the present invention; Figure 4 A front view of the syringe provided in an embodiment of this utility model; Figure 5 A cross-sectional view of the outer tube provided in an embodiment of this utility model; Figure 6 A partial structural schematic diagram of the needle and probe provided in an embodiment of this utility model; Figure 7 A partial cross-sectional view of the probe provided in an embodiment of this utility model.

[0020] Icons: 1-Needle; 10-Proximal spiral cut; 11-Distal spiral cut; 12-Blade face; 2-Outer tube; 20-Spiral component; 21-Inner tube layer; 22-Outer tube layer; 3-Probe; 30-Flexible material layer. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0024] Example: like Figures 1-4 As shown, the biopsy needle provided in this embodiment includes a needle tube 1; the needle tube 1 includes a proximal end and a distal end. From the proximal end to the distal end of the needle tube 1, the body of the needle tube 1 is sequentially provided with a proximal spiral slit 10 and a distal spiral slit 11. Both the proximal spiral slit 10 and the distal spiral slit 11 extend spirally along the axial direction of the needle tube 1, and the pitch of the distal spiral slit 11 is smaller than the pitch of the proximal spiral slit 10; there are multiple proximal spiral slits 10, and at least two of the proximal spiral slits 10 have equal pitches; the body of the needle tube 1 is covered with a flexible sealing layer, and the sealing layer extends from the proximal end of the needle tube 1 to the distal end of the needle tube 1.

[0025] The biopsy needle provided in this embodiment is used to perform live sampling on the human body. The end of the biopsy needle that enters the patient's body is the distal end, and the other end is the proximal end. The end of the needle tube 1 that is close to the distal end of the biopsy needle is its distal end, and the end of the needle tube 1 that is close to the proximal end of the biopsy needle is its proximal end.

[0026] When using the biopsy needle provided in this embodiment to perform biopsy sampling on a human body, the distal end of the biopsy needle can be inserted into the body cavity through the endoscope working channel pre-set inside the body until the distal end of the biopsy needle reaches the target area of ​​the cavity. The proximal end of the biopsy needle usually needs to be equipped with an operating handle and does not need to enter the body. During the process of the biopsy needle entering the body, because the needle tube 1 of the biopsy needle is provided with a proximal spiral slit 10 and a distal spiral slit 11, the needle tube 1 is easy to deform at the slits, and its overall flexibility is improved. Correspondingly, the flexibility of the biopsy needle is also improved. The biopsy needle can easily bend and deform along the direction of the body cavity, so that the distal end of the biopsy needle can smoothly enter the small and curved cavities of the body for biopsy sampling.

[0027] Furthermore, the biopsy needle provided in this embodiment has a larger pitch proximal spiral slit 10 near the proximal end of the needle tube 1, and a smaller pitch distal spiral slit 11 near the distal end of the needle tube 1. This can improve the overall flexibility of the biopsy needle, and further enhance the flexibility of the biopsy needle near its distal end, thereby improving the smoothness of the distal end of the biopsy needle entering the human body. At the same time, it can effectively ensure the support of the biopsy needle near its proximal end to meet the rigidity requirements of the proximal end of the biopsy needle.

[0028] The fact that there are multiple proximal spiral slits 10 and at least two of them have equal pitch can further improve the support of the biopsy needle near its proximal position and meet the various rigidity requirements of the proximal end of the biopsy needle, thereby effectively improving the use effect of the biopsy needle.

[0029] Furthermore, the biopsy needle provided in this embodiment covers the entire tube body from the proximal end to the distal end of the needle tube 1 with a flexible sealing layer, which can block the distal spiral cut 11 and the proximal spiral cut 10, thereby sealing all spiral cuts in the needle tube 1 and effectively improving the sealing performance of the needle tube 1.

[0030] Compared with existing technologies, the biopsy needle provided in this embodiment enhances the flexibility of the needle tube 1 by providing a proximal spiral slit 10 and a distal spiral slit 11 on the needle tube 1. This makes the biopsy needle easier to bend and deform, allowing it to smoothly enter the small and curved cavities of the human body for biopsy sampling. The pitch of the distal spiral slit 11 is smaller than that of the proximal spiral slit 10, which further enhances the flexibility of the needle tube 1 near its distal end while simultaneously improving the support of the needle tube 1 near its proximal end. This satisfies the rigidity requirements at the proximal end of the needle tube 1, preventing the proximal end of the needle tube 1 from being too flexible and affecting the effectiveness of the biopsy needle. Furthermore, the equal pitch of at least two proximal spiral slits 10 further enhances the support of the biopsy needle near its proximal end, simultaneously satisfying various rigidity requirements at the proximal end of the biopsy needle. In addition, the biopsy needle's sealing layer, which fully covers the area from the proximal to the distal end of the needle tube 1, effectively ensures the airtightness of the needle tube 1.

[0031] The sealing layer can be made of polymer materials such as PTFE (Polytetrafluoroethylene), PEBAX (Poly Ether Block Amide), or PTFE (Polytetrafluoroethylene). PEBAX is a nylon elastic foam material that combines rigid polyamide with flexible polyether, resulting in a material that is both flexible and durable.

[0032] When the sealing layer is made of PTFE or PEBAX, the sealing layer can be formed by heat shrinking a heat shrink tube made of PTFE or PEBAX onto the needle tube 1. When the sealing layer is made of PTFE, the sealing layer can be formed onto the needle tube 1 by spraying.

[0033] To effectively ensure the rigidity of the proximal end of the needle tube 1 and the tube body near the proximal end, in this embodiment, it is preferred that at least two of the proximal spiral cuts 10 that are close to the proximal end of the needle tube 1 and are adjacent are equal pitch spiral cuts, and the pitch of the two proximal spiral cuts 10 is equal.

[0034] Based on this, if the number of proximal spiral slits 10 is at least three, the pitch of the remaining proximal spiral slits 10 can be set to a gradually changing pitch or a constant pitch, and the pitch of the remaining proximal spiral slits 10 is less than the pitch of the proximal spiral slit 10 closest to the proximal end of the needle tube 1.

[0035] For example, when there are three proximal spiral slits 10, from the proximal end of the needle tube 1 to the distal end, the pitch of the two proximal spiral slits 10 closest to the proximal end of the needle tube 1 is constant and equal, while the pitch of the proximal spiral slits 10 farther from the proximal end of the needle tube 1 gradually changes, and from the proximal end of the needle tube 1 to the distal end, the pitch of the proximal spiral slit 10 decreases.

[0036] When there are at least four proximal spiral slits 10, the pitch of the two proximal spiral slits 10 closest to the proximal end of the needle tube 1 is constant and equal, and the remaining proximal spiral slits 10 are all variable pitch spiral slits, and the pitch of each of the remaining proximal spiral slits 10 decreases sequentially from the proximal end of the needle tube 1 to the distal end of the needle tube 1; or, the pitch of each of the remaining proximal spiral slits 10 is constant, and from the proximal end of the needle tube 1 to the distal end of the needle tube 1, the pitch of the proximal spiral slit 10 closer to the distal end of the needle tube 1 is smaller than the pitch of the proximal spiral slit 10 closer to the proximal end of the needle tube 1.

[0037] To further enhance the overall flexibility of the needle tube 1, a middle spiral slit can also be provided on the tube body of the needle tube 1. The middle spiral slit is located between the proximal spiral slit 10 and the distal spiral slit 11. One end of the middle spiral slit near the proximal spiral slit 10 is connected to the proximal spiral slit 10, and the other end is connected to the distal spiral slit 11. At this time, a continuous spiral slit is formed on the tube body of the needle tube 1.

[0038] It should be noted that there is no limitation on the pitch of the intermediate spiral cut. In order to improve the performance of the needle tube 1, in this embodiment, it is preferred that the maximum pitch of the intermediate spiral cut is less than the minimum pitch of the proximal spiral cut 10, and the minimum pitch of the intermediate spiral cut is greater than the maximum pitch of the distal spiral cut 11.

[0039] like Figure 6 As shown, the tube body near its distal end of the needle tube 1 may also be provided with multiple perforations. These multiple perforations are used to further enhance the flexibility of the tube body near its distal end of the needle tube 1, thereby further enhancing the flexibility of the biopsy needle in use.

[0040] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the biopsy needle provided in this embodiment also includes an outer tube 2, which is sleeved outside the needle tube 1 and extends from the inside to the outside of the outer tube 2. The outer tube 2 includes multiple tube layers that are sleeved sequentially.

[0041] The outer tube 2, formed by multiple tube layers nested in sequence, is a composite tube. Compared with the one-piece molded outer tube 2, the composite tube is more flexible and can further improve the overall flexibility of the biopsy needle, making the biopsy needle easier to bend and deform.

[0042] like Figure 5 As shown, at least one set of two adjacent tube layers are provided with a spiral member 20, which extends spirally along the axial direction of the outer tube 2 to form a tubular protective layer.

[0043] It should be noted that the pitch of the auger 20 can be small enough or equal to zero so that the auger 20 can form a tubular protective layer after it extends spirally along the axial direction of the outer tube 2.

[0044] The tubular protective layer formed by the spiral component 20 can not only provide support to ensure the structural stability of the outer tube 2, but also has better flexibility than the integrally formed tubular protective layer, and will not cause a reduction in the overall flexibility of the outer tube 2.

[0045] In addition, since the proximal end of the needle tube 1 is usually the needle tip, the tubular protective layer formed by the spiral member 20 can also play a protective role, preventing the needle tip of the needle tube 1 from puncturing the outer tube 2 during its movement inside the outer tube 2.

[0046] Furthermore, the spiral component 20 is flat and the flat surface of the spiral component 20 is parallel to the axial direction of the outer tube 2.

[0047] When the spiral part 20 is flat, it not only makes it easier for the spiral part 20 to form a tubular protective layer, but also the flat surface of the spiral part 20 can be used to further effectively prevent the needle tip of the needle tube 1 from puncturing the outer tube 2.

[0048] To ensure the supporting effect of the spiral component 20 and the protection effect on the needle tip, the spiral component 20 is preferably made of metal or alloy in this embodiment.

[0049] Furthermore, the material of the spiral component 20 can be SUS304 (i.e., 304 stainless steel).

[0050] In this embodiment, the outer tube 2 includes a proximal end and a distal end, and the outermost tube layer among the multiple tube layers of the outer tube 2 is the outer tube layer 22, such as... Figure 5 As shown, the end of the spiral member 20 near the far end of the outer tube 2 is located inside the outer tube layer 22.

[0051] The end of the outer tube 2 closest to the distal end of the biopsy needle is its distal end, and the end of the outer tube 2 closest to the proximal end of the biopsy needle is its proximal end. For example... Figure 5 As shown, when the end of the spiral member 20 near the distal end of the outer tube 2 is located inside the outer tube layer 22, the end of the spiral member 20 near the distal end of the outer tube 2 can be blocked by the outer tube layer 22 and will not be exposed outside the outer tube 2, so that it will not come into contact with the endoscope working channel and damage the endoscope when the biopsy needle moves in the endoscope working channel.

[0052] To effectively improve the flexibility of the outer tube 2, each layer of the outer tube 2 can be made of polymer material.

[0053] Specifically, the outer tube 2 may include two tube layers. The inner tube layer is called the inner tube layer 21, and the outer tube layer is called the outer tube layer 22. The inner tube layer 21 may be made of PEBAX or PTFE, and the outer tube layer 22 may be made of PEBAX.

[0054] like Figure 2 , Figure 3 and Figure 6 As shown, the distal end of the needle tube 1 is provided with a blade surface 12 to form a needle tip, and the needle tip is covered with a rigid coating.

[0055] The cutting edge 12 at the distal end of the needle tube 1 is used to form the needle tip so that the biopsy needle can perform puncture, and covering the needle tip with a rigid coating can improve the puncture stability of the needle tip.

[0056] The number of blade surfaces 12 at the distal end of the needle tube 1 is not limited, such as... Figure 2As shown, the cutting edge 12 can be formed by cutting from one side of the needle tube 1 to the other in one go, in which case there is only one cutting edge 12, and the needle tip is an A-type needle tip. Or, as Figure 3 As shown, the needle tube 1 is cut once on each side to form a blade surface 12. At this time, there are two blade surfaces 12, and the needle tip is a type B needle tip.

[0057] There are several options for the material of the rigid coating on the needle tip. The rigid coating material can be DLC (Diamond-Like Carbon) or nitride.

[0058] DLC is a high-hardness, low-friction carbon-based coating. When the rigid coating material is DLC, a coating process can be used to cover the outside of the needle tip with DLC. Nitrides also have high hardness. When the rigid coating material is nitride, a nitriding process can be used to form nitrides on the surface of the needle tip.

[0059] like Figure 2 , Figure 3 and Figure 6 As shown, the biopsy needle provided in this embodiment also includes a probe 3, which is slidably installed inside the needle tube 1.

[0060] The end of probe 3 near the distal end of the biopsy needle is its distal end, and the end of probe 3 near the proximal end of the biopsy needle is its proximal end. The distal end of probe 3 can be rounded by grinding or other methods.

[0061] To further improve the overall flexibility of the biopsy needle, the diameter of probe 3 in this embodiment can be smaller than the diameter of probe 3 in existing biopsy needles.

[0062] Therefore, to ensure the overall strength of probe 3 and maintain its good flexibility, probe 3 can be made of metal or alloy, such as... Figure 7 As shown, the probe 3 is covered with a flexible material layer 30, and the distal end of the probe 3 extends beyond the flexible material layer 30.

[0063] The metal and alloy materials ensure the overall strength of the probe 3, while the flexible material layer 30 further enhances its overall strength and provides good flexibility, thus solving the problem of difficulty in moving the distal end of the biopsy needle into place due to its high hardness. Simultaneously, the flexible material layer 30 also ensures the proper gap between the probe 3 and the needle tube 1.

[0064] The fact that the distal end of the probe 3 extends beyond the flexible material layer 30 can prevent the flexible material layer 30 from affecting the normal function of the distal end of the probe 3.

[0065] In this embodiment, the probe 3 can be made of nickel-titanium alloy, and the flexible material layer 30 can be a polymer thin-walled tube. Specifically, the flexible material layer 30 can be made of PEEK (Polyetheretherketone, abbreviated as PEEK).

[0066] In summary, the biopsy needle provided in this embodiment maximizes the overall flexibility of the biopsy needle by setting a proximal spiral slit 10 and a distal spiral slit 11 on the needle tube 1, using a more flexible and compliant composite tube for the outer tube 2, and thinning the probe 3 and covering the probe 3 with a flexible material layer 30. This makes the biopsy needle more flexible to use and can be adapted to existing Fuji or Pentax ultrasonic bronchoscopes.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A biopsy needle, characterized in that, Including the syringe (1); The needle tube (1) includes a proximal end and a distal end. From the proximal end to the distal end of the needle tube (1), the body of the needle tube (1) is provided with a proximal spiral slit (10) and a distal spiral slit (11) in sequence. Both the proximal spiral slit (10) and the distal spiral slit (11) extend spirally along the axial direction of the needle tube (1), and the pitch of the distal spiral slit (11) is smaller than the pitch of the proximal spiral slit (10). The proximal helical cut (10) is a plurality of, and at least two of the proximal helical cuts (10) have equal pitch; The needle tube (1) is covered with a flexible sealing layer, and the sealing layer extends from the proximal end of the needle tube (1) to the distal end of the needle tube (1).

2. The biopsy needle according to claim 1, characterized in that, It also includes an outer tube (2), which is sleeved outside the needle tube (1) and extends from the inside to the outside of the outer tube (2). The outer tube (2) includes multiple tube layers that are sleeved sequentially.

3. The biopsy needle according to claim 2, characterized in that, At least one set of two adjacent tube layers are provided with a spiral member (20), which extends spirally along the axial direction of the outer tube (2) to form a tubular protective layer.

4. The biopsy needle according to claim 3, characterized in that, The spiral component (20) is flat and the flat surface of the spiral component (20) is parallel to the axial direction of the outer tube (2).

5. The biopsy needle according to claim 3, characterized in that, The spiral component (20) is made of metal or alloy.

6. The biopsy needle according to claim 3, characterized in that, The outer tube (2) includes a proximal end and a distal end. The outermost tube layer among the multiple tube layers of the outer tube (2) is the outer tube layer (22). The end of the spiral (20) near the distal end of the outer tube (2) is located inside the outer tube layer (22).

7. The biopsy needle according to claim 2, characterized in that, Each layer of the outer tube (2) is made of polymer material.

8. The biopsy needle according to any one of claims 1-7, characterized in that, The distal end of the needle tube (1) is provided with a blade surface (12) to form a needle tip, and the needle tip is covered with a rigid coating.

9. The biopsy needle according to any one of claims 1-7, characterized in that, It also includes a probe (3), which is slidably mounted inside the needle tube (1).

10. The biopsy needle according to claim 9, characterized in that, The probe (3) is made of metal or alloy. The probe (3) includes a proximal end and a distal end. The probe (3) is covered with a flexible material layer (30), and the distal end of the probe (3) extends beyond the flexible material layer (30).

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