A multi-needle biopsy needle

Abstract

The application relates to a multi-needle biopsy needle, and relates to the technical field of medical devices, which comprises a handle and an outer needle arranged on the handle, a plurality of accommodating cavities are arranged in the outer needle, and an inner needle is arranged in any accommodating cavity; a firing mechanism for firing the plurality of inner needles is arranged in the handle, one end of the firing mechanism is communicated with the plurality of inner needles, and the other end of the firing mechanism is provided with an inner tube communicated with the other end; and the end of the inner tube away from the inner needle is located outside the handle and connected with a syringe. The application effectively solves the problem that the traditional single-needle biopsy needle needs to be repeatedly punctured for multiple times, has the effects of reducing the pain of patients, reducing tissue damage and the risk of missed diagnosis, and improving the operation efficiency and safety of biopsy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a multi-needle biopsy needle. BACKGROUND

[0002] In the medical field, biopsy needles are important tools for obtaining tissue samples of lesions for disease diagnosis. The development of biopsy needles is crucial for improving the accuracy and efficiency of diagnosis. With the continuous deepening of medical research and the increasing demand of clinical practice, the performance and function of biopsy needles are constantly improving and perfecting. Accurate tissue sampling can provide reliable basis for subsequent pathological analysis, which helps doctors to develop more precise treatment plans, and is of great significance for disease diagnosis and treatment of patients.

[0003] Currently, traditional biopsy needles almost all use single-needle design when taking tissue samples. When multiple tissue samples are needed, doctors usually have to pull out the needle and re-penetrate, achieving multi-point sampling through repeated puncture operations. This method is a common means in biopsy sampling and is widely used in clinical practice.

[0004] However, this traditional single-needle biopsy needle has obvious defects in multi-point sampling. Repeated puncture operations will cause more pain to patients, and the missed diagnosis rate is high. In addition, doctors need to perform multiple tedious insertion and removal operations, increasing the complexity and difficulty of operation. Therefore, the existing single-needle biopsy needle has great room for improvement in multi-point tissue sampling. CONTENT OF THE INVENTION

[0005] In order to solve the problem of traditional single-needle biopsy needle that is not convenient for multi-point tissue sampling, the present application provides a multi-needle biopsy needle.

[0006] The multi-needle biopsy needle provided by the present application adopts the following technical scheme: A multi-needle biopsy needle, comprising a handle and an outer needle arranged on the handle, a plurality of accommodating cavities are arranged in the outer needle, and an inner needle is arranged in any one of the accommodating cavities; a firing mechanism for firing the plurality of inner needles is arranged in the handle, one end of the firing mechanism is in communication with the plurality of inner needles, and the other end of the firing mechanism is provided with an inner tube in communication therewith; and one end of the inner tube away from the inner needle is located outside the handle and connected with a syringe.

[0007] By adopting the above technical scheme, the plurality of inner needles and the firing mechanism are arranged, so that the biopsy needle can synchronously fire the plurality of inner needles in one puncture operation, thereby obtaining tissue samples of multiple positions at one time, solving the problem of repeated puncture of the traditional single-needle biopsy needle multiple times, reducing the pain of the patient and the operation time, and also reducing the tissue damage and missed diagnosis risk caused by multiple punctures; the firing mechanism is communicated with the inner tube and the syringe, facilitating rapid collection of tissue samples by negative pressure suction during sampling, and facilitating pushing of the tissue samples out of the needle body after sampling, thereby improving the efficiency and convenience of biopsy operation.

[0008] Preferably, the firing mechanism comprises a sliding tube, a power spring, a pressing firing assembly and a reset handle, one end of the sliding tube is communicated with the plurality of inner needles, and the other end of the sliding tube is sleeved on the inner tube, the power spring is located at the end of the sliding tube away from the inner needles and is sleeved on the inner tube, the pressing firing assembly and the reset handle are both fixed on the sliding tube, the pressing firing assembly is in embedded fitting with the handle, and the pressing firing assembly and the reset handle are both in sliding fitting with the handle along the axial direction of the inner needles.

[0009] By adopting the above technical scheme, one end of the sliding tube in the firing mechanism is communicated with the plurality of inner needles and the other end is sleeved on the inner tube, so that the inner needles are communicated with the internal environment of the inner tube, thereby transmitting the negative pressure generated by the syringe for sample collection; the power spring is located at the end of the sliding tube away from the inner needles and is sleeved on the inner tube, thereby providing power for firing of the inner needles; the pressing firing assembly is in embedded fitting with the handle, so as to be locked, and after unlocking by pressing, the pressing firing assembly is in sliding fitting with the handle along the axial direction of the inner needles, thereby synchronously firing the plurality of inner needles for tissue sampling; and after sampling is completed, the reset handle can drive the entire firing mechanism to reset, so as to be used for next sampling, thereby improving the efficiency of multi-point tissue sampling and simplifying the operation process of the doctor.

[0010] Preferably, the pressing firing assembly comprises a fixed block, a firing spring, an embedded block, a sliding rod and a pressing block, the fixed block is fixedly connected with the sliding tube, the firing spring is arranged between the fixed block and the embedded block, a positioning groove is formed in the handle and in embedded fitting with the embedded block, the pressing block is located outside the handle, the two ends of the sliding rod are fixedly connected with the embedded block and the pressing block respectively, a sliding groove is formed in the handle along the axial direction of the inner needles and in sliding fitting with the sliding rod, and the sliding groove is communicated with the positioning groove.

[0011] By adopting the above technical solution, the fixed block and sliding tube in the pressing and firing assembly are fixedly connected to ensure synchronous movement during firing. The firing spring is set between the fixed block and the insert. When the pressing block is pressed, the slide rod can drive the insert to compress the firing spring, causing the insert to disengage from the positioning groove of the handle, thereby releasing the lock on the sliding tube and realizing the firing operation of the inner needle. During firing, the slide rod slides in the groove on the handle, ensuring the stability and accuracy of the firing process. After sampling is completed, the slide rod will slide in the opposite direction in the groove with the reset handle until the firing spring drives the insert to re-embed into the positioning groove, preparing for the next firing. The whole system realizes convenient and quick control of the firing of the inner needle, which is convenient for multi-needle biopsy needles to perform multi-point tissue sampling operations.

[0012] Preferably, the receiving cavity includes a main cavity located at the center of the outer needle and a plurality of auxiliary cavities arranged in a circumferential array along the main cavity. The inner needle includes a main needle and a plurality of auxiliary needles, and the auxiliary needles correspond one-to-one with the auxiliary cavities. The main needle is located in the main cavity, and any one of the auxiliary needles is located in an auxiliary cavity.

[0013] By adopting the above technical solution, the receiving cavity is arranged in an array of main cavities and multiple auxiliary cavities, and the inner needle is correspondingly equipped with a main needle and multiple auxiliary needles, enabling the biopsy needle to simultaneously sample from the center and multiple circumferential positions. Among them, the main needle can obtain tissue from the central area of ​​the lesion, while the auxiliary needles can cover the surrounding area. A wider range of samples can be collected in a single puncture, improving the representativeness and comprehensiveness of the sampling, reducing missed diagnoses caused by sampling position deviations, and enhancing the accuracy of biopsy results.

[0014] Preferably, the tip of any of the auxiliary needles is pre-shaped into a bent shape, and after firing, the tips of the multiple auxiliary needles spread outward along the circumference of the main needle to form a ring-shaped sampling area.

[0015] By adopting the above technical solution, the needle tip of the auxiliary needle is pre-treated into a bent shape and spreads outward to form a ring-shaped sampling area after firing. This can significantly expand the sampling coverage of a single puncture. Compared with a straight needle, it can more evenly obtain tissue samples from different locations in the lesion area, reduce the limitations of sampling, and improve the efficiency and comprehensiveness of multi-point sampling, which can provide richer sample evidence for pathological diagnosis.

[0016] Preferably, an annular groove is formed on the outer wall of one end of the inner tube located inside the sliding tube, and a sealing ring is embedded in the annular groove.

[0017] By adopting the above technical solution, an annular groove and sealing ring are set on the outer wall of the inner tube, which enhances the sealing performance at the connection between the inner tube and the sliding tube, prevents air leakage during negative pressure suction, and thus maintains a stable negative pressure environment, allowing the syringe to efficiently extract tissue samples. At the same time, it reduces the friction between the sliding tube and the inner tube, making the sliding tube move more smoothly, and improving the overall durability and reliability of the instrument.

[0018] Preferably, a limiting block is provided along the axial direction of the inner needle inside the handle, and a slide rail is provided on the sliding tube to form an embedded fit with the limiting block.

[0019] By adopting the above technical solution, the limiting block inside the handle is fitted with the slide rail on the sliding tube, which can restrict the movement direction of the sliding tube during firing or retraction, so that the sliding tube can only move in a straight line along the inner needle axis, preventing it from rotating or deviating during firing, thereby ensuring that multiple inner needles are accurately fired and returned to their original position, and improving the stability and accuracy of operation.

[0020] Preferably, a guide rod is provided between the fixing block and the insert, and the firing spring is sleeved on the guide rod.

[0021] By adopting the above technical solution, the firing spring is sleeved on the guide rod between the fixed block and the insert, which can keep the firing spring moving in a straight line during compression and release, avoid bending or jamming, ensure the smooth and efficient transmission of firing force, improve the response speed and consistency of the firing mechanism, reduce spring wear, and extend the service life of the pressing firing assembly.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. This application, by setting up multiple inner needles and a firing mechanism, enables the biopsy needle to fire multiple inner needles simultaneously in a single puncture operation, thereby obtaining tissue samples from multiple locations at once. This effectively solves the problem of traditional single-needle biopsy needles requiring multiple punctures, significantly reducing patient pain and operation time, and also reducing tissue damage and the risk of missed diagnoses caused by multiple punctures, thus improving the efficiency and safety of biopsy operations. At the same time, the firing mechanism is connected to the inner tube and syringe, facilitating rapid collection of tissue samples through negative pressure suction and simplifying the sample ejection process, thereby improving the convenience of operation. 2. The firing mechanism of this application achieves stable and precise firing control through the cooperation of the pressing firing component, the reset handle, and the limiting block and slide rail. Doctors can unlock the firing mechanism with a simple pressing operation. The power spring provides firing power, and the reset handle facilitates quick reset, simplifying the operation process. At the same time, the sealing ring design between the inner tube and the sliding tube ensures the sealing during the negative pressure aspiration process, maintains a stable negative pressure environment, and allows the syringe to efficiently extract tissue samples. The overall design improves the reliability and durability of the instrument. 3. This application adopts an array arrangement of a main cavity and multiple auxiliary cavities. The inner needle is equipped with a main needle and multiple auxiliary needles. The needle tips of the auxiliary needles are pre-bent and spread outward after firing to form a ring-shaped sampling area. This design can simultaneously sample from the center of the lesion and multiple circumferential positions, expand the sampling coverage of a single puncture, make sample collection more uniform and comprehensive, reduce the limitations caused by sampling position deviation, enhance the representativeness and accuracy of biopsy results, and provide a more reliable basis for pathological diagnosis. Attached Figure Description

[0023] Figure 1 This is an exploded view (before the inner needle is fired) that mainly illustrates the overall structure in the embodiments of this application. Figure 2 This is a cross-sectional view (before the inner pin fires) that mainly illustrates the structure of the firing mechanism in the embodiments of this application. Figure 3 This is an exploded view (after the inner pin is fired) of the main structure of the press-to-fire component in the embodiments of this application. Figure 4 This is a partial isometric schematic diagram (after the inner needle is fired) of the embodiment of this application, which mainly shows the receiving cavity and the inner needle structure.

[0024] Reference numerals: 1. Handle; 11. Upper housing; 111. Positioning groove; 112. Slide groove; 12. Lower housing; 121. Clearance groove; 122. Limiting block; 2. Outer needle; 21. Receiving cavity; 211. Main cavity; 212. Auxiliary cavity; 3. Plug; 4. Inner needle; 41. Main needle; 42. Auxiliary needle; 421. Annular sampling area; 5. Firing mechanism; 51. Sliding tube; 511. Communicating groove; 512. Slide rail; 52. Power spring; 53. Press-to-fire assembly; 531. Fixing block; 532. Guide rod; 5321. Anti-slip rod; 533. Firing spring; 534. Insert; 535. Slide rod; 536. Pressing block; 54. Reset handle; 6. Inner tube; 61. Annular mounting groove; 62. Sealing sleeve; 63. Annular groove; 631. Sealing ring; 7. Syringe; 8. Connector. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail.

[0026] This application discloses a multi-needle biopsy needle.

[0027] Reference Figure 1 and Figure 2A multi-needle biopsy needle includes a handle 1 and an outer needle 2 disposed on the handle 1. In this embodiment, the handle 1 includes an integrally formed upper shell 11 and a lower shell 12. A plug 3 is embedded in one end of the handle 1, and the outer needle 2 is inserted and fixed to the plug 3. The outer needle 2 has multiple receiving cavities 21, and an inner needle 4 is embedded in any one of the receiving cavities 21. The handle 1 is provided with a firing mechanism 5 for firing the multiple inner needles 4, and each inner needle 4 passes through the plug 3 and is connected to the firing mechanism 5. The end of the firing mechanism 5 away from the inner needle 4 is provided with an inner tube 6 connected to it. The end of the inner tube 6 away from the inner needle 4 is located outside the handle 1 and connected to the syringe 7. In this embodiment, an annular mounting groove 61 is provided on the outer wall of the end of the inner tube 6 away from the inner needle 4, and the annular mounting groove 61 forms an embedded fit with the upper housing 11 and the lower housing 12 of the handle 1. A connector 8 is provided between the inner tube 6 and the syringe 7, and one end of the connector 8 is connected to the syringe 7. A sealing sleeve 62 is fixedly connected to the end of the inner tube 6 located outside the handle 1, and the end of the connector 8 away from the syringe 7 is sleeved on the end of the inner tube 6 located outside the handle 1 and forms an interference fit with it.

[0028] In practical use, the doctor first holds the handle 1 and accurately inserts the outer needle 2 into the center of the patient's lesion. When the outer needle 2 reaches the appropriate position, the doctor operates the firing mechanism 5 in the handle 1 to push multiple inner needles 4 out of the receiving cavity 21 of the outer needle 2 and insert them into the center of the patient's lesion and surrounding tissue. Then, the doctor uses the negative pressure generated by the syringe 7 to quickly collect tissue samples. After sampling, the doctor reverses the operation of the firing mechanism 5 to reset the inner needles 4 so that the biopsy needle can be pulled out from the lesion. The whole process achieves the acquisition of tissue samples from multiple locations at one time, reducing patient pain and operation time, and also reducing the risk of tissue damage and missed diagnosis caused by multiple punctures. The syringe 7 is designed to facilitate the ejection of tissue samples from the needle after sampling, improving the efficiency and convenience of biopsy procedures. The plug 3, which is embedded and fixed at the end of the handle 1, provides a mounting base for the outer needle 2 and the inner needle 4. The inner tube 6 is fitted into the upper shell 11 and lower shell 12 of the handle 1 through the annular mounting groove 61, ensuring the stability of the inner tube 6 during use and preventing shaking from affecting sample collection. At the same time, the connector 8 is tightly connected to the inner tube 6 and the syringe 7 and forms an interference fit with the sealing sleeve 62, ensuring a sealed environment during sampling and ensuring the smooth progress of the collection process and the integrity of the sample.

[0029] Reference Figure 2 and Figure 3The firing mechanism 5 includes a sliding tube 51, a power spring 52, a pressing firing assembly 53, and a reset handle 54. Each of the inner needles 4 passes through a plug 3 and is inserted into the end of the sliding tube 51. The end of the sliding tube 51 is provided with multiple connecting grooves 511 for connecting the inner needles 4 and the interior of the sliding tube 51, corresponding to the number and position of the inner needles 4. The end of the sliding tube 51 away from the inner needles 4 is sleeved on the inner tube 6, and the power spring 52 is located at the end of the sliding tube 51 away from the inner needles 4 and is sleeved on the inner tube 6. Reference Figure 2 and Figure 3 The press-to-fire assembly 53 includes a fixing block 531, a guide rod 532, a firing spring 533, an insert 534, a slide rod 535, and a pressing block 536. The fixing block 531 is fixedly connected to the outer wall of the sliding tube 51, and two fixing blocks 531 are provided and symmetrically arranged about the sliding tube 51. Two guide rods 532 and two firing springs 533 are provided corresponding to the number and position of the fixing blocks 531. One end of each guide rod 532 is fixedly connected to the insert 534, and the other end of each guide rod 532 passes through a corresponding fixing block 531 and is fixedly connected to an anti-slip rod 5321. The firing spring 533 is located between the fixed block 531 and the insert block 534. The two firing springs 533 are respectively sleeved on the two guide rods 532. The upper housing 11 of the handle 1 is provided with a positioning groove 111 that forms an embedded fit with the insert block 534. The pressing block 536 is located on the outside of the handle 1. The two ends of the slide rod 535 are respectively fixedly connected to the insert block 534 and the pressing block 536. The upper housing 11 of the handle 1 is provided with a sliding groove 112 along the axial direction of the inner needle 4 that forms a sliding fit with the slide rod 535. The sliding groove 112 is located on the side of the positioning groove 111 close to the outer needle 2 and is connected to the positioning groove 111. Reference Figure 2 and Figure 3 The reset handle 54 is located on the side of the sliding tube 51 away from the pressing block 536 and is fixedly connected to the outer wall of the sliding tube 51. The reset handle 54 slides along the axial direction of the inner needle 4 with the handle 1, and the lower housing 12 of the handle 1 is provided with a relief groove 121 for avoiding the reset handle 54.

[0030] In practical use, after the doctor accurately inserts the outer needle 2 into the center of the patient's lesion, he only needs to press the pressing block 536 in the pressing and firing assembly 53. The pressing block 536 can drive the insert 534 to move downward and compress the firing spring 533, so that the insert 534 is disengaged from the positioning groove 111, thereby releasing the lock on the sliding tube 51. Then, under the elastic action of the power spring 52, the sliding tube 51 moves quickly along the inner tube 6 to the sampling site, and simultaneously drives the inner needle 4 to pierce the tissue for sampling, which improves the efficiency of multi-point tissue sampling. In addition, the inner needle 4 and the inside of the sliding tube 51 are connected through the connecting groove 511, which can transmit the negative pressure environment generated by the syringe 7 so as to quickly collect tissue samples. During the firing of the inner needle 4, the guide rod 532 in the firing assembly 53 provides guidance for the compression and release of the firing spring 533, preventing bending or jamming, ensuring a smooth and efficient transmission of firing force, reducing spring wear, and extending the service life of the firing assembly 53. The anti-slip rod 5321 prevents the guide rod 532 from sliding out of the fixing block 531, ensuring the stability of the firing process. Furthermore, when the fixing block 531 in the firing assembly 53 moves with the sliding tube 51, it can synchronously drive the sliding rod 535 to slide within the sliding groove 112, further ensuring the stability and accuracy of the firing process. After sampling is completed, medical staff only need to pull the reset handle 54 in the firing mechanism 5 in the opposite direction, so that it drives the sliding tube 51 to move away from the sampling site along the axis of the inner needle 4. This will drive the inner needle 4 to be pulled out of the tissue and returned to the receiving cavity 21. During this process, the slide bar 535 moves in the opposite direction in the slide groove 112 with the reset handle 54 and drives the insert 534 to move until the insert 534 moves to the positioning groove 111. Then the firing spring 533 returns to its original state, drives the insert 534 to re-embed into the positioning groove 111 and fixes the sliding tube 51 in the current position, so that the doctor can easily pull out the biopsy needle and process the tissue sample.

[0031] Reference Figure 2 and Figure 3 The lower housing 12 of the handle 1 has an integrally formed limiting block 122 along the axial direction of the inner needle 4 on its inner wall, and the outer wall of the sliding tube 51 has an integrally formed slide rail 512 that fits into the limiting block 122. In actual use, when the sliding tube 51 moves along the axial direction of the inner needle 4, the limiting block 122 and the slide rail 512 cooperate with each other to effectively limit the movement trajectory of the sliding tube 51, prevent the sliding tube 51 from deviating or shaking during movement, thereby ensuring that multiple inner needles 4 are accurately fired and returned to their original position, and further ensuring the accuracy of the sampling of the inner needle 4.

[0032] Reference Figure 2 and Figure 3The inner tube 6 has an annular groove 63 on the outer wall of one end of the sliding tube 51, and a sealing ring 631 is embedded in the annular groove 63. In actual use, when the sliding tube 51 moves along the inner tube 6, the sealing ring 631 embedded in the annular groove 63 on the outer wall of the inner tube 6 fits tightly against the inner wall of the sliding tube 51, which can effectively prevent air from entering from the gap between the inner tube 6 and the sliding tube 51, thereby maintaining a stable negative pressure environment. This allows the inner needle 4 to continuously and efficiently extract tissue samples, avoiding insufficient negative pressure due to air leakage, which would affect the sampling effect. At the same time, the sealing ring 631 can also reduce the friction between the sliding tube 51 and the inner tube 6, reduce the wear of the two during relative movement, extend the service life of the inner tube 6 and the sliding tube 51, and ensure the stability and reliability of the overall structure of the biopsy needle.

[0033] Reference Figure 3 and Figure 4 The receiving cavity 21 includes a main cavity 211 opened at the center of the outer needle 2 and a plurality of auxiliary cavities 212 arranged in a circumferential array along the main cavity 211. The inner needle 4 includes a main needle 41 and a plurality of auxiliary needles 42, and the number and position of the auxiliary needles 42 and the auxiliary cavities 212 correspond one-to-one. The main needle 41 is embedded in the main cavity 211, and any one of the auxiliary needles 42 is embedded in the corresponding auxiliary cavity 212. In this embodiment, the inner needle 4 is made of nickel-titanium material. The needle tip of any one of the auxiliary needles 42 is pre-shaped into a bent shape, and after firing, the needle tips of the plurality of auxiliary needles 42 spread outward along the circumference of the main needle 41 to form an annular sampling area 421.

[0034] In practical use, when the doctor fires the inner needle 4 through the firing mechanism 5, the main needle 41 first exits from the main cavity 211 and penetrates deep into the central area of ​​the lesion to obtain tissue samples from the core area. At the same time, multiple auxiliary needles 42 are fired from the auxiliary cavity 212 under the action of the firing force. Their pre-bent needle tips spread outwards around the main needle 41 to form a ring-shaped sampling area 421 to sample the tissue around the lesion. This design allows the biopsy needle to sample from the center and multiple circumferential positions simultaneously during a single puncture, significantly expanding the sampling coverage of a single puncture. Compared with traditional single-needle biopsy needles, this multi-needle array arrangement can more evenly obtain tissue samples from different locations in the lesion area, which not only improves the efficiency of multi-point sampling but also provides richer sample evidence for pathological diagnosis. This helps doctors to more accurately determine the nature and extent of the lesion, reduce the risk of missed diagnosis due to insufficient sampling, and enhance the accuracy and reliability of biopsy results.

[0035] The implementation principle of this application embodiment is as follows: the firing mechanism 5 (including a sliding tube 51, a power spring 52, a pressing firing assembly 53, and a reset handle 54) inside the handle 1 controls the synchronous firing and reset of multiple inner needles 4. The outer needle 2 is provided with multiple receiving cavities 21 to embed the inner needles 4 (including a central main needle 41 and circumferentially bent auxiliary needles 42). When the outer needle 2 is inserted into the lesion, the doctor presses the pressing block 536 to release the sliding tube 51. The power spring 52 drives the sliding tube 51 to quickly eject the inner needles 4. 41 punctures the center of the lesion, while the auxiliary needle 42, with its pre-bent design, spreads outward to form a ring-shaped sampling area 421, enabling multi-point sampling with a single puncture. In addition, the syringe 7 transmits negative pressure through the connecting groove 511 at the end of the inner tube 6 and the sliding tube 51, and works with the sealing ring 631 to maintain a sealed environment for efficient collection of tissue samples. After sampling, the inner needle 4 can be reset simply by pulling the sliding tube 51 with the reset handle 54. Overall, this reduces patient pain and operation time while improving sampling coverage and diagnostic accuracy.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-needle biopsy needle, characterized in that: The device includes a handle (1) and an outer needle (2) disposed on the handle (1). The outer needle (2) has multiple receiving cavities (21) and an inner needle (4) is disposed in any of the receiving cavities (21). The handle (1) is provided with a firing mechanism (5) for firing the multiple inner needles (4). One end of the firing mechanism (5) is connected to the multiple inner needles (4), and the other end of the firing mechanism (5) is provided with an inner tube (6) connected to it. The end of the inner tube (6) away from the inner needles (4) is located outside the handle (1) and is connected to a syringe (7).

2. The multi-needle biopsy needle according to claim 1, characterized in that: The firing mechanism (5) includes a sliding tube (51), a power spring (52), a pressing firing assembly (53), and a reset handle (54). One end of the sliding tube (51) is connected to a plurality of inner needles (4), and the other end of the sliding tube (51) is sleeved on the inner tube (6). The power spring (52) is located at the end of the sliding tube (51) away from the inner needles (4) and is sleeved on the inner tube (6). The pressing firing assembly (53) and the reset handle (54) are both fixed on the sliding tube (51). The pressing firing assembly (53) and the handle (1) are fitted together, and the pressing firing assembly (53) and the reset handle (54) are both slidably fitted together with the handle (1) along the axial direction of the inner needles (4).

3. The multi-needle biopsy needle according to claim 2, characterized in that: The press-to-fire assembly (53) includes a fixed block (531), a firing spring (533), an insert (534), a slide rod (535), and a pressing block (536). The fixed block (531) is fixedly connected to the sliding tube (51). The firing spring (533) is disposed between the fixed block (531) and the insert (534). The handle (1) has a positioning groove (111) that fits into the insert (534). The pressing block (536) is located outside the handle (1). The two ends of the slide rod (535) are fixedly connected to the insert (534) and the pressing block (536) respectively. The handle (1) has a sliding groove (112) that slides into the slide rod (535) along the axial direction of the inner needle (4). The sliding groove (112) is connected to the positioning groove (111).

4. The multi-needle biopsy needle according to claim 1, characterized in that: The receiving cavity (21) includes a main cavity (211) located at the center of the outer needle (2) and a plurality of auxiliary cavities (212) arranged in a circumferential array along the main cavity (211). The inner needle (4) includes a main needle (41) and a plurality of auxiliary needles (42), and the auxiliary needles (42) correspond one-to-one with the auxiliary cavities (212). The main needle (41) is located in the main cavity (211), and any one of the auxiliary needles (42) is located in the auxiliary cavity (212).

5. A multi-needle biopsy needle according to claim 4, characterized in that: The tip of any of the auxiliary needles (42) is bent after a pre-shaped process, and after firing, the tips of the multiple auxiliary needles (42) spread outward along the circumference of the main needle (41) to form an annular sampling area (421).

6. A multi-needle biopsy needle according to claim 2, characterized in that: The inner tube (6) has an annular groove (63) on the outer wall of one end inside the sliding tube (51), and a sealing ring (631) is embedded in the annular groove (63).

7. A multi-needle biopsy needle according to claim 2, characterized in that: A limiting block (122) is provided inside the handle (1) along the axial direction of the inner needle (4), and a slide rail (512) is provided on the sliding tube (51) to form an embedded fit with the limiting block (122).

8. A multi-needle biopsy needle according to claim 3, characterized in that: A guide rod (532) is provided between the fixing block (531) and the insert (534), and the firing spring (533) is sleeved on the guide rod (532).

Images