Puncture needle and biopsy needle using same

Abstract

The utility model relates to a puncture needle and a biopsy needle adopting the puncture needle. The puncture needle comprises a needle body, a needle tip is formed at the front end of the needle body, a sampling groove is formed in the position, behind the needle tip, of the needle body, and at least one protrusion distributed in the length direction of the sampling groove is arranged at the bottom of the sampling groove in a protruding mode. According to the biopsy needle, the puncture needle is adopted as an inner needle, when the outer needle has a hollow part in a multi-gear mode, the protrusion at the bottom of the sampling groove can play a role in blocking sampled tissue, the sampled tissue is prevented from moving towards the hollow part of the outer needle along with loading of the outer needle, and therefore the tissue extraction efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to medical devices, and more particularly to a biopsy needle and a biopsy needle using the same. BACKGROUND

[0002] Tumors are generally divided into two categories: benign and malignant. In order to achieve early detection, correct diagnosis and timely treatment, biopsy is the main way to obtain pathological diagnosis. Biopsy needles are used to puncture organs or tissues under ultrasound or CT imaging to obtain histological specimens in a cutting manner for pathological diagnosis. The higher the puncture accuracy, the smaller the puncture blind area, and the more complete the sampling, the more effective method and approach for doctors, patients, specimen detection and rehabilitation treatment. For this reason, the prior art has designed biopsy needles that can adjust the sampling stroke and puncture depth, such as the biopsy needle disclosed in Chinese Utility Model Patent CN221599984U. However, the same biopsy needle will have a certain hollow distance inside the outer needle tube when sampling at different sampling stroke positions with the same sampling groove length. Referring to Figure 1a , when the biopsy needle is in the longest sampling stroke position L1, the entire sampling groove 3 of the inner needle 1 is exposed and will not be blocked by the outer needle 2. Referring to Figure 1b , when another sampling stroke position L2 is used, part of the sampling groove 3 is located inside the outer needle 2, resulting in a certain hollow distance L3 inside the needle tube of the outer needle 2. In this case, after sampling tissue is obtained using the sampling stroke position L2, there will be three situations during the extraction of the tissue: (1) the outer needle 2 is loaded backward, and the sampling tissue remains in its original state, making it easier to extract the tissue; (2) the outer needle 2 is loaded backward, and under the action of the outer needle 2, the sampling tissue moves to the hollow part L3 of the outer needle 2, resulting in partial exposure of the sampling tissue, which makes it difficult to extract the tissue; (3) the outer needle 2 is loaded backward, and under the action of the outer needle 2, the sampling tissue moves to the hollow part L3 of the outer needle 2 and is compressed, resulting in the inability of the sampling tissue to be exposed, which makes it impossible to extract the tissue. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a biopsy needle and a biopsy needle using the same, which can prevent the movement of the sampling tissue to facilitate the extraction of the sampling tissue, in view of the above-mentioned defects of the prior art.

[0004] To solve the technical problem, the present application provides a biopsy needle in a first aspect, comprising a needle body, a needle tip formed at a front end of the needle body, and a sampling groove formed on the needle body behind the needle tip, wherein the bottom of the sampling groove is provided with at least one protrusion distributed along the length direction of the sampling groove.

[0005] In one embodiment of the puncture needle according to the first aspect of the present application, the height of the protrusion in the sampling groove is between 1 / 2 and 2 / 3 of the depth of the sampling groove.

[0006] In one embodiment of the puncture needle according to the first aspect of the present application, the width of the protrusion is flush with the width of the sampling groove.

[0007] In one embodiment of the puncture needle according to the first aspect of the present application, the protrusion has a vertical surface on the side facing the needle tip, a first concave arc surface connected from the bottom of the vertical surface to the bottom of the sampling groove, and a first convex arc surface connected from the top of the vertical surface to the top of the protrusion.

[0008] In one embodiment of the puncture needle according to the first aspect of the present application, the protrusion has a first convex arc surface connected from the top of the protrusion to the bottom of the sampling groove on the side facing the needle tip.

[0009] In one embodiment of the puncture needle according to the first aspect of the present application, the protrusion has a second convex arc surface connected to the top of the protrusion on the side facing away from the needle tip, and a second concave arc surface connected from the bottom of the second convex arc surface to the bottom of the sampling groove.

[0010] In one embodiment of the puncture needle according to the first aspect of the present application, the protrusion has a second convex arc surface or an inclined surface connected from the top of the protrusion to the bottom of the sampling groove on the side facing away from the needle tip.

[0011] In one embodiment of the puncture needle according to the first aspect of the present application, the positions of the at least one protrusion distributed along the length direction of the sampling groove correspond to the sampling stroke levels of the puncture needle.

[0012] To solve the technical problems, the present application provides a biopsy needle in a second aspect, which has an inner needle and an outer needle coaxially sleeved and elastically loaded and fired, and the inner needle is the puncture needle described above.

[0013] The puncture needle and the biopsy needle using the same according to the present application have the following beneficial effects: the protrusion at the bottom of the sampling groove of the puncture needle according to the embodiments of the present application forms a blocking feature, which, when the puncture needle is used as the inner needle of the biopsy needle, can block the sampling tissue and prevent the sampling tissue from moving to the hollow part of the outer needle with the loading of the outer needle, thereby improving the efficiency of tissue extraction. BRIEF DESCRIPTION OF DRAWINGS

[0014] The present application will be further described below in conjunction with the drawings and embodiments, in which:

[0015] Figure 1ais a structural schematic diagram of a biopsy needle in the inner needle firing and outer needle loading state under the longest sampling stroke gear L1 in the prior art;

[0016] Figure 1b is Figure 1a is a structural schematic diagram of a biopsy needle in the inner needle firing and outer needle loading state under the sampling stroke gear L2 shown in the figure;

[0017] Figure 2 is a structural schematic diagram of a biopsy needle according to an embodiment of the present application;

[0018] Figure 3 is Figure 2 is an enlarged structural schematic diagram of part A in the figure;

[0019] Figure 4 is Figure 3 is a side view of the inner needle shown in the figure;

[0020] Figure 5 is Figure 4 is an enlarged structural schematic diagram of part B in the figure;

[0021] Figure 6 is Figure 2 is a sampling principle schematic diagram of a biopsy needle shown in the figure.

[0022] BRIEF DESCRIPTION OF DRAWINGS: 10-biopsy needle; 1, 11-inner needle; 111-needle body; 112-needle tip; 2, 12-outer needle; 3, 13-sampling groove; 131-front end face; 132-rear end face; 14-protrusion; 141-first concave arc face; 142-vertical face; 143-first convex arc face; 144-second convex arc face; 145-second concave arc face; 15-sampling tissue. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. Moreover, the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0024] The present application proposes a puncture needle, comprising a needle body, the front end of the needle body forms a needle tip, a sampling groove is formed on the needle body behind the needle tip, and at least one protrusion is formed on the bottom of the sampling groove and distributed along the length direction of the sampling groove, forming a blocking feature. When the puncture needle is used as the inner needle of a biopsy needle, and there is a hollow part in the outer needle under the multi-sampling stroke gear mode, the protrusion on the bottom of the sampling groove can block the sampling tissue from moving to the hollow part of the outer needle with the loading of the outer needle.

[0025] Figure 2This diagram illustrates the structure of a biopsy needle 10 according to an embodiment of the present application, which uses the above-described puncture needle as the inner needle 11. Figure 3 Then it shows Figure 2 Enlarged structural diagram of section A. See also Figure 2 and Figure 3 As shown, the biopsy needle 10 has an inner needle 11 and an outer needle 12 coaxially sleeved and extending outwards. The main body of the biopsy needle 10 is provided with a mechanical power structure capable of elastically loading and firing the inner and outer needles 11. It may also include an adjustment structure for adjusting the sampling stroke and puncture depth of the biopsy needle 10. This mechanical power structure and adjustment structure are existing technologies and will not be described in detail in this application.

[0026] See details Figure 3 Combination Figure 4 As shown, the inner needle 11 includes a needle body 111, with a needle tip 112 formed at the front end of the needle body 111. A sampling groove 13 is formed on the needle body 111 behind the needle tip 112. The sampling groove 13 extends axially along the needle body 111, and its axial length L11 is the longest sampling stroke setting of the biopsy needle 10. A protrusion 14 is provided at the bottom of the sampling groove 13 corresponding to another sampling stroke setting L12 of the biopsy needle 10. According to different embodiments of this application, the number of protrusions 14 and their positions along the length of the sampling groove correspond to the various sampling stroke settings of the biopsy needle. See also Figure 3 Combination Figure 4 As shown, the front face 131 of the sampling groove 13 near the needle tip 112 is a slope, and the rear face 132 away from the needle tip 112 is a vertical surface. The height h2 of the protrusion 14 within the sampling groove 13 is preferably between 1 / 2 and 2 / 3 of the depth h1 of the sampling groove 13, and the width of the protrusion 14 is flush with the width of the sampling groove 13. This design of the protrusion 14 creates a blocking feature, which can prevent the movement of the sampled tissue when the outer needle 12 is loaded after sampling.

[0027] See further Figure 4 Combination Figure 5As shown, the protrusion 14 on the side towards the needle tip 112 is composed of a first concave arc surface 141, a vertical surface 142 and a first convex arc surface 143, the first concave arc surface 141 is connected to the bottom of the sampling groove 13 from the bottom of the vertical surface 142, and the first convex arc surface 143 is connected to the top of the protrusion 14 from the top of the vertical surface 142. The vertical surface 142 can provide good blocking effect for the sampling tissue at the sampling stroke position L12, and the first concave arc surface 141 and the first convex arc surface 143 can facilitate the passage of the sampling tissue at the sampling stroke position L11. Further, the protrusion 14 on the side away from the needle tip 112 is composed of a second convex arc surface 144 connecting the top of the protrusion and a second concave arc surface 145 connecting the bottom of the sampling groove 13 from the bottom of the second convex arc surface 144, which can facilitate the passage of the sampling tissue at the sampling stroke position L11. According to different embodiments of the present application, the shape of the protrusion 14 is not limited to the illustrated embodiment, for example, the protrusion 14 on the side towards the needle tip 112 can directly use an entire first convex arc surface connecting the top of the protrusion to the bottom of the sampling groove instead, and on the side away from the needle tip 112 can use an entire second convex arc surface or an inclined surface connecting the top of the protrusion to the bottom of the sampling groove instead.

[0028] The biopsy needle 10 according to the above-mentioned embodiments of the present application is provided with a protrusion 14 in the sampling groove 13 of the inner needle 11 corresponding to the sampling stroke position, and the sampling principle is described with reference to Figure 6 As shown, the first sampling stroke position of the biopsy needle 10 is L11, and the second sampling stroke position is L12. As shown in Figure 6 (a), after the sampling at the first sampling stroke position is completed, the sampling tissue 15 fills the sampling groove 13 and covers the protrusion 14, and the loading of the outer needle 12 backward will not affect the sampling tissue 15, which remains in the original state position, and the outer needle 12 is loaded to expose the sampling groove 13, and the sampling tissue 15 can be extracted. After the sampling at the second sampling stroke position is completed, due to the difference in the characteristics of the tissue, there are three situations when the outer needle 12 is loaded to extract the sampling tissue 15: as shown in Figure 6 (b), the sampling tissue 15 remains in the original position during the loading of the outer needle 12; as shown in Figure 6 (c), when the sampling tissue 15 has good fluidity and poor adhesion during the loading of the outer needle 12, the sampling tissue 15 will retreat following the loading process of the outer needle 12, at this time the protrusion 14 can play a role in limiting and blocking, preventing the sampling tissue 15 from retreating into the hollow part of the outer needle 12 following the loading action of the outer needle 12; as shown in Figure 6(d) as shown, when the sampling tissue 15 is good in flowability, poor in adhesion and low in density during the loading of the outer needle 12, the sampling tissue 15 will retreat and be compressed after the loading process of the outer needle 12, at this time, the protrusion 14 can also play a limiting blocking role to prevent the sampling tissue 15 from retreating into the hollow part of the outer needle 12 following the loading action of the outer needle 12. In the above three cases, after the outer needle 12 is loaded in place, the sampling tissue 15 is exposed in the sampling groove 13, which is convenient for extraction.

[0029] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A puncture needle, comprising a needle body, wherein a needle tip is formed at the front end of the needle body, and a sampling groove is formed on the needle body behind the needle tip, characterized in that, The bottom of the sampling groove is provided with at least one protrusion distributed along the length of the sampling groove.

2. The puncture needle according to claim 1, characterized in that, The height of the protrusion within the sampling groove is between 1 / 2 and 2 / 3 of the depth of the sampling groove.

3. The puncture needle according to claim 2, characterized in that, The width of the protrusion is flush with the width of the sampling groove.

4. The puncture needle according to claim 3, characterized in that, The protrusion has a vertical surface on the side facing the needle tip, a first concave arc surface connecting the bottom of the vertical surface to the bottom of the sampling groove, and a first convex arc surface connecting the top of the vertical surface to the top of the protrusion.

5. The puncture needle according to claim 3, characterized in that, The protrusion has a first convex arc surface on the side facing the needle tip, which connects from the top of the protrusion to the bottom of the sampling groove.

6. The puncture needle according to claim 3, characterized in that, The protrusion has a second convex arc surface connecting the top of the protrusion and a second concave arc surface connecting the bottom of the second convex arc surface to the bottom of the sampling groove on the side opposite to the needle tip.

7. The puncture needle according to claim 3, characterized in that, The protrusion has a second convex arc or slope on the side opposite to the needle tip, which connects from the top of the protrusion to the bottom of the sampling slot.

8. The puncture needle according to claim 1, characterized in that, The position of the at least one protrusion distributed along the length of the sampling groove corresponds to the sampling stroke setting of the puncture needle.

9. A biopsy needle comprising an inner needle and an outer needle that are coaxially sleeved and can be elastically loaded and fired, characterized in that, The inner needle is a puncture needle according to any one of claims 1-7.

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