Punch biopsy needle with changeable cutting surface

Abstract

The utility model discloses a puncture biopsy needle with transformable cutting surface belongs to puncture medical instrument field, including handle, needle cover and needle core, needle cover is connected with handle, and needle core is movably inserted into needle cover, and the front end of needle core has puncture bevel, and puncture bevel can go out by the front end opening of needle cover, and the outer wall of the front end of needle cover is provided with a plurality of cutting bevels along the circumference, and the adjacent two cutting bevels are connected with each other, and the intersection of cutting bevel and the inner wall of needle cover forms the cutting edge, and the connecting place between the adjacent two cutting bevels is provided with transition bevel, and transition bevel and the adjacent two cutting bevels three intersection points form the sharp part. The biopsy needle of the utility model is convenient for puncture, realizes 360 full range cutting to the tissue to be sampled, guarantees that more tissue strip can enter into needle cover, and the sharp part of needle cover front end first and stings into the tissue to be sampled, helps the front end of needle cover to sting into the tissue, greatly facilitates the operation of medical staff.

Description

Technical Field

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

[0002] Biopsy needles are commonly used tools in interventional diagnostics and treatment. They are medical devices used for sampling and aspirating cells from pyramidal tumors and unidentified tumors in various organs such as the kidneys, liver, lungs, breasts, thyroid glands, prostate, pancreas, testes, uterus, ovaries, and the body surface. The main types of biopsy needles include aspiration biopsy needles and cutting biopsy needles. When using an aspiration biopsy needle, the needle sheath is first inserted through the skin, and then the needle sheath is inserted into the tissue to be sampled. At this time, some tissue strips enter the needle sheath, and the aspiration device (such as a syringe) connected to the tail of the biopsy needle aspirates and collects the tissue strips inside the needle sheath. Currently, the puncture site at the tip of the needle sheath of biopsy needles is generally designed with a single-bevel puncture structure (see [link to biopsy needle description]). Figure 1 This biopsy needle only cuts the tissue to be sampled from one side. The single-bevel puncture structure has limited cutting ability, resulting in insufficient tissue aspiration in a single session. Multiple punctures increase patient discomfort and complicate procedures for medical staff. Existing cutting biopsy needles, due to their multiple cutting surfaces at the tip, are prone to causing excessive damage along the puncture path, increasing the risk of complications. Utility Model Content

[0003] The technical problem this invention aims to solve is that, in the prior art, aspiration biopsy needles cannot remove enough tissue at once, and multiple punctures increase patient pain and risks; cutting biopsy needles are prone to bleeding and ectopic tissue impaction along the puncture path. Therefore, this invention provides a biopsy needle with an adjustable cutting surface.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a biopsy needle with a changeable cutting surface, including a handle, a needle sheath, and a needle core. The needle sheath is connected to the handle, and the needle core is movably inserted into the needle sheath. The front end of the needle core has a puncture bevel, which can be extended through the front opening of the needle sheath. Multiple cutting bevels are provided circumferentially on the outer wall of the front end of the needle sheath. Adjacent cutting bevels are connected to each other. The intersection of the cutting bevels and the inner wall of the needle sheath forms a cutting edge. A transition bevel is provided at the connection between adjacent cutting bevels. The transition bevel and the adjacent cutting bevels converge at a point to form a spike.

[0005] Furthermore, the plurality of cutting bevels are evenly arranged along the circumference of the needle sleeve.

[0006] Furthermore, the cutting bevel has three surfaces.

[0007] Furthermore, both the needle sheath and the needle core have circular cross-sections. The inner diameter of the needle sheath is D, and the outer diameter of the needle core is d, where 0.1mm ≤ Dd ≤ 0.2mm.

[0008] Furthermore, the front end of the needle core is symmetrically provided with two oblique wedge surfaces, and the two oblique wedge surfaces and the puncture oblique surface intersect at a point to form a puncture part.

[0009] Furthermore, the biopsy needle for easy puncture also includes an outer tube, which is fixedly connected to the handle, and the needle sheath passes through the outer tube.

[0010] Furthermore, a connector is installed on the end of the handle away from the outer tube. The connector has a hollow structure and is connected to the needle sleeve.

[0011] The beneficial effects of this invention are as follows: The biopsy needle with adjustable cutting surfaces of this invention first uses the single-sided oblique cut surface of the needle core to penetrate normal tissue. The oblique cut surface at the front end of the needle core acts as a pre-opening for the needle sheath to enter. At this time, the needle sheath with multiple cutting surfaces passes through normal tissue under the protection of the needle core, greatly reducing damage along the puncture path. The oblique cut surface facilitates the smooth insertion of the needle sheath tip into the target tumor tissue. After the needle sheath with multiple cutting surfaces enters the target tissue, the needle core is withdrawn. The cutting edge on the needle sheath forms a complete circle in the circumferential direction, thereby achieving 360° all-round cutting of the target tissue, ensuring that more tissue strips enter the needle sheath, greatly increasing the biopsy sample volume, and reducing the risk of puncture biopsy. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a three-dimensional view of the biopsy needle with an interchangeable cross-section according to this utility model;

[0014] Figure 2 yes Figure 1 A magnified view of point A in the biopsy needle with variable cross-section shown;

[0015] Figure 3 yes Figure 2 The left view of the needle sheath in a biopsy needle with a variable cross-section is shown.

[0016] In the diagram: 1. Handle, 2. Needle sheath, 21. Cutting bevel, 22. Blade edge, 23. Transition bevel, 24. Spike, 3. Needle core, 31. Puncture bevel, 32. Wedge bevel, 33. Puncture part, 4. Outer tube, 5. Connector. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0018] Please see Figures 1-3 This utility model provides a biopsy needle with a variable cut surface, including a handle 1, a needle sheath 2, and a needle core 3. The needle sheath 2 is connected to the handle 1 and is a tubular structure with both ends open. The needle core 3 is movably inserted into the needle sheath 2. The front end of the needle core 3 has a puncture bevel 31, which can be extended through the front opening of the needle sheath 2. The rear opening of the needle sheath 2 is used to communicate with an aspiration device (e.g., an injection syringe commonly used in medicine). Multiple cutting bevels 21 are provided circumferentially on the outer wall of the front end of the needle sheath 2. Adjacent cutting bevels 21 are connected to each other. The intersection of the cutting bevels 21 and the inner wall of the needle sheath 2 forms a cutting edge 22. A transition bevel 23 is provided at the connection between adjacent cutting bevels 21 on the needle sheath 2. The transition bevel 23 and the two adjacent cutting bevels 21 intersect at a point to form a spike 24.

[0019] This invention relates to a biopsy needle with a variable cutting surface. The needle core 3 is a solid structure. Medical personnel can control the movement of the needle core 3 from the rear end of the handle 1, thereby moving the needle core 3 forward to ensure that the puncture bevel 31 extends outside the front opening of the needle sheath 2, or pulling the needle core 3 backward from the needle sheath 2 to separate it from the needle sheath 2. In use, the puncture bevel 31 is first moved to the outside of the front opening of the needle sheath 2, and the front end of the needle core 3 passes through normal human tissue into the tissue to be sampled. Then, the needle sheath 2 is passed through the human tissue. During this process, the puncture bevel at the front end of the needle core 3 acts as a pre-opening and guiding protection for the entry of the needle sheath 2, which is conducive to the smooth insertion of the front end of the needle sheath 2 into the target tissue.

[0020] When the needle sheath 2 pierces human tissue and moves into the tissue to be sampled, the medical staff pulls the needle core 3 out of the needle sheath 2 from the rear end of the handle 1 to avoid occupying the internal space of the needle sheath 2 and thus affecting the amount of tissue sampled. After the needle core 3 is pulled out, because the two adjacent cutting bevels 21 are connected to each other, the cutting edge 22 on the needle sheath 2 forms a complete circle in the circumferential direction, thereby achieving 360° all-round cutting of the tissue to be sampled, ensuring that more tissue strips can enter the needle sheath 2, greatly increasing the puncture sampling volume. The spike 24 formed at the intersection of the transition bevel 23 and the two adjacent cutting bevels 21 is located at the foremost end of the needle sheath 2, and it comes into contact with the tissue first, which helps the front end of the needle sheath 2 to penetrate into the tissue, greatly facilitating the operation of the medical staff.

[0021] Multiple cutting bevels 21 are evenly arranged along the circumference of the needle sleeve 2. In this embodiment, there are three cutting bevels 21, which are evenly arranged along the circumference of the needle sleeve 2. In other embodiments, there may be two or more cutting bevels 21, and the specific number is not limited here.

[0022] Both the needle sheath 2 and the needle core 3 have circular cross-sections. The inner diameter of the needle sheath 2 is D, and the outer diameter of the needle core 3 is d. Where 0.1mm≤Dd≤0.2mm, that is, the difference between the inner diameter of the needle sheath 2 and the outer diameter of the needle core 3 is between (0.1-0.2)mm. This ensures that the needle core 3 can move smoothly within the needle sheath 2. At the same time, since the difference between the inner diameter of the needle sheath 2 and the outer diameter of the needle core 3 is not large, when the needle core 3 punctures the human tissue first, the front end of the needle sheath 2, which follows closely behind, can further puncture the human tissue smoothly not far from the puncture site of the needle core 3.

[0023] In a preferred embodiment, the front end of the needle core 3 is symmetrically provided with two inclined wedge surfaces 32, which intersect with the puncture oblique surface 31 at a point to form a puncture portion 33. The puncture portion 33 has a pointed structure, which ensures that the needle core 3 can be smoothly punctured into the human skin, providing protection for the needle core 3 and the needle sheath to puncture the skin.

[0024] The biopsy needle with a changeable cut surface of this utility model also includes an outer tube 4, which is fixedly connected to the handle 1. The needle sleeve 2 passes through the outer tube 4. The needle sleeve 2 can enhance the structural strength of the part on the needle sleeve 2 that is connected to the handle 1, effectively preventing the connection between the needle sleeve 2 and the handle 1 from easily bending or even breaking, and ensuring the reliability of the connection between the needle sleeve 2 and the handle 1.

[0025] In addition, a connector 5 is installed on the end of the handle 1 away from the outer tube 4. The connector 5 has a hollow structure and is connected to the needle sleeve 2. The connector 5 is used to connect to the suction device so that the needle sleeve 2 can be connected to the suction device.

[0026] This utility model discloses a biopsy needle with a changeable cutting surface. First, the needle core 3 punctures human tissue, and then the needle sheath 2 passes through the human tissue. The puncture bevel at the front end of the needle core 3 acts as a pre-opening and guiding protection for the entry of the needle sheath 2, which is conducive to the smooth puncture of human tissue by the front end of the needle sheath 2. During sampling, the cutting edge 22 on the needle sheath 2 forms a complete circle in the circumferential direction, thereby realizing 360° all-round cutting of the tissue to be sampled, ensuring that more tissue strips can enter into the needle sheath 2. The spike 24 at the front end of the needle sheath 2 first punctures into the tissue to be sampled, which helps the front end of the needle sheath 2 to puncture into the tissue. The traditional method of directly inserting the beveled surface of the needle sheath 2 into the tissue is changed to inserting the beveled surface of the needle core 3 into the tissue, which greatly facilitates the operation of medical personnel.

[0027] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A biopsy needle with a variable cross-section, characterized in that: The device includes a handle, a needle sheath, and a needle core. The needle sheath is connected to the handle, and the needle core is movably inserted into the needle sheath. The front end of the needle core has a puncture bevel, which can protrude through the front opening of the needle sheath. Multiple cutting bevels are circumferentially formed on the outer wall of the front end of the needle sheath. Adjacent cutting bevels are interconnected, and the intersection of the cutting bevels and the inner wall of the needle sheath forms a cutting edge. A transition bevel is provided at the connection between adjacent cutting bevels, and the transition bevel and the adjacent cutting bevels converge at a point to form a spike.

2. The biopsy needle with a changeable cross-section as described in claim 1, characterized in that: Multiple cutting bevels are evenly arranged along the circumference of the needle sleeve.

3. The biopsy needle with a variable cross-section as described in claim 2, characterized in that: The cutting bevel has three.

4. The biopsy needle with a changeable cross-section as described in claim 1, characterized in that: Both the needle sheath and the needle core have circular cross-sections. The inner diameter of the needle sheath is D, and the outer diameter of the needle core is d, where 0.1mm ≤ Dd ≤ 0.2mm.

5. The biopsy needle with a variable cross-section as described in claim 1, characterized in that: The front end of the needle core is symmetrically provided with two oblique wedge surfaces, and the two oblique wedge surfaces and the puncture oblique surface intersect at a point to form a puncture part.

6. The biopsy needle with a changeable cross-section as described in claim 1, characterized in that: The biopsy needle with a variable cross-section also includes an outer tube, which is fixedly connected to the handle, and the needle sheath passes through the outer tube.

7. The biopsy needle with a variable cross-section as described in claim 6, characterized in that: A connector is installed on the end of the handle away from the outer tube. The connector has a hollow structure and is connected to the needle sleeve.

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