Neurosurgery tumor sampler

Abstract

The invention provides a neurosurgical tumor sampler, and belongs to the technical field of neurosurgical tumor sampling, the neurosurgical tumor sampler comprises a negative pressure cylinder for providing negative pressure to attract tumor tissues, a hollow needle tube for collecting the tumor tissues is mounted at the lower end of the negative pressure cylinder, and a solid needle is movably connected in the hollow needle tube along the axis direction; two groups of triangular tool bits are symmetrically arranged on the end face of the solid needle about the axis; a sealing column is embedded and fixed in the upper end of the negative pressure cylinder, and a piston rod is slidably connected in the sealing column in a penetrating manner; a built-in groove is formed in the piston rod, a steering power mechanism for driving the solid needle to rotate and cut tumor tissue is arranged in the built-in groove, and a pressing type driving mechanism for applying pressure to the steering power mechanism is arranged in the piston rod; the solid needle and the triangular tool bit are controlled to rotationally cut tumor tissue, the elastic pressing rod is pressed on the inner wall of the negative pressure cylinder in the cutting process, the stability of the sampler for cutting the tissue at the moment is kept, and the sampling operation safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of neurosurgery tumor sampling, in particular to a neurosurgery tumor sampler. Background Art

[0002] The tumor sampler used in neurosurgery is mainly based on the principle of negative pressure suction technology and mechanical assisted operation to achieve accurate collection of tumor tissue. The tumor tissue is sucked out of the surgical area through negative pressure suction and sent into the sampling device. Compared with traditional tissue forceps sampling, the sampler operation is more intuitive and is especially suitable for tumor tissue that is difficult to obtain by clamping.

[0003] For example, publication number CN113349838A discloses an oncology puncture sampler; the oncology puncture sampler includes a puncture outer needle and a sampling inner needle, the puncture outer needle and the sampling inner needle are arranged in the same direction, and the puncture outer needle is sleeved on the outer peripheral side of the sampling inner needle; the puncture outer needle includes a barrel sleeve, a first needle tip with a sampling groove and a needle handle, the barrel sleeve is sleeved on the outer peripheral side of the needle handle and is slidably connected to the needle handle, the first needle tip is arranged on the lower side of the needle handle and is fixedly connected to the needle handle, the sampling groove radially penetrates the first needle tip, and the first needle tip cooperates with the barrel sleeve to achieve protection of the tumor after sampling, thereby preventing tumor cells from spreading to other parts during sampling, causing the tumor to spread.

[0004] For example, publication number CN219742754U discloses a gynecological tumor sampler, comprising: a sampling main cavity; a hand clamping end, which is installed at corresponding positions on the left and right sides of the outer surface of the sampling main cavity; an extraction end, which is installed on the rear surface of the sampling main cavity; and a collection end, which is installed on the front surface of the sampling main cavity; wherein the sampling main cavity includes a medical gynecological tumor sampling main cavity, a reserve tube is fixedly installed in the middle position of the inner part of the medical gynecological tumor sampling main cavity, and scale marking rulers are fixedly installed at corresponding positions on the upper and lower sides of the outer surface of the reserve tube; it is easy to use, the operation can be completed by the single-handed clamping end, and the needle can be used for positioning during the collection and extraction process, which can accurately hit the target and facilitate clinical use during medical care; the sampling external plate is a clear visual marking window, which is easier for clinical operation during medical care, and the improved needle is longer in length, which can reach a wider sampling site, and can easily collect local tissue of the endometrium.

[0005] For example, publication number CN220309148U discloses a tumor sampling device that is convenient for separating tumors, comprising a sampling needle, a sampling rod, a cutting knife, a first catheter and a second catheter; one end of the sampling needle is connected to the first catheter, the sampling rod is placed in the first catheter, one end of the sampling rod is connected to the cutting knife, and the blade of the cutting knife is in close contact with the inner wall of the first catheter and the sampling needle; the other end of the sampling rod passes through the first catheter; a plurality of sampling holes are provided on the sampling needle; the second catheter is integrated with the first catheter, a direction regulator is provided on the second catheter, a first guide wire and a second guide wire are provided in the second catheter, and the catheter head end of the second catheter is closed; one end of the first guide wire and the second guide wire are both placed on the inner wall of the end of the second catheter; the other ends of the first guide wire and the second guide wire are both connected to the direction regulator Multiple cutting knives are evenly distributed on the sampling rod; after cutting a tumor, the sampler can be pulled back again after the tumor tissue enters the sampling hole again, thereby cutting more tumor tissue and avoiding multiple sampling operations; in order to sample complete tumor tissue, some existing samplers cut off the attracted tissue after negative pressure sampling. During the cutting operation, the needle is likely to move in the patient's body or pierce other tissues, which may cause bleeding or tissue damage, and may also cause infection or other complications. In addition, if the sampler cannot stably cut off the tumor tissue, or the tumor tissue attracted by the negative pressure is not completely retained when it is withdrawn, the tumor tissue may fall off, and the falling off may cause tumor cells to enter the blood circulation or lymphatic system, thereby causing tumor metastasis.

[0006] In summary, it is particularly important to design a neurosurgical tumor sampler that can cut off tumor tissue stably. Summary of the Invention

[0007] The purpose of the present invention is to overcome the problem of tray placement space in the above-mentioned background technology and to design a neurosurgical tumor sampler that can cut off tumor tissue stably.

[0008] In order to achieve the above-mentioned purpose, the technical idea adopted by the present invention is: in solving the problem of unstable tumor tissue cutting in the prior art, in order to keep the tumor stably attracted into the hollow needle tube, the solid needle and the triangular cutter head are controlled to rotate by a press-type drive mechanism, and the triangular cutter head can rotate and cut the tumor tissue in the hollow needle tube. During the cutting process, the elastic pressure rod is pressed on the inner wall of the negative pressure cylinder, which can prevent the hollow needle tube and the solid needle from moving in the patient's body, maintain the sampling stability, and the cut tumor tissue can be completely received in the hollow needle tube under the shielding effect of the triangular cutter head, avoiding the situation where the tissue falls off during the withdrawal of the sampler.

[0009] Based on the above technical ideas, the technical solution adopted by the present invention is: A neurosurgical tumor sampler comprises a negative pressure cylinder that provides negative pressure to attract tumor tissue, a hollow needle tube for collecting tumor tissue being installed at the lower end of the negative pressure cylinder, a solid needle being movably connected in the hollow needle tube along the axial direction, and two groups of triangular cutter heads being symmetrically arranged on the end face of the solid needle about the axis; a sealing column being fixedly embedded in the upper end of the negative pressure cylinder, a piston rod being slidably connected through the sealing column, a piston disk being fixedly installed at the end of the piston rod, and the solid needle being rotatably connected through the lower end face of the piston disk; a built-in groove being provided inside the piston rod, a steering power mechanism for driving the solid needle to rotate and cut the tumor tissue being provided in the built-in groove, and a pressing drive mechanism for applying pressure to the steering power mechanism being provided in the piston rod.

[0010] As a further limitation of the above technical solution, the negative pressure cylinder has a pressure channel opened inside one end close to the hollow needle tube, and the solid needle is arranged through the pressure channel.

[0011] A further limitation of the above technical solution is that the steering power mechanism includes a fixed seat fixedly installed in the built-in groove inside the piston rod, and a twisted transmission rod is rotatably installed in the fixed seat; the twisted transmission rod is rotatably arranged in the built-in groove along the axial direction, and the lower end surface of the twisted transmission rod is fixedly connected to the solid needle.

[0012] A further limitation of the above technical solution is that the twisted transmission rod has an external spiral sleeve connected to a twisted groove positioning plate, and the twisted groove positioning plate is longitudinally movably arranged in the built-in groove.

[0013] As a further limitation of the above technical solution, the lower end surface of the twist groove positioning plate and the upper end surface of the fixing seat are elastically connected with a positioning spring, and the positioning spring is sleeved on the outside of the twist transmission rod.

[0014] To further limit the above technical solution, the pressing drive mechanism includes a slideway opened in the negative pressure cylinder and connected to the built-in groove, a disc seat is fixedly installed in the slideway, a pressing power rod is slidingly connected through the disc seat, and the pressing power rod is slidingly arranged inside the slideway; two sets of linkage plates are fixed on the lower end surface of the pressing power rod, and the two sets of linkage plates are respectively fixedly connected to the two sides of the twist groove positioning plate.

[0015] To further limit the above technical solution, an embedded groove is provided on the pressing power rod, an upper return spring is elastically connected between the pressing power rod and the upper end surface of the disc seat, and a lower return spring is elastically connected between the pressing power rod and the lower end surface of the disc seat; the upper return spring and the lower return spring are embedded in the embedded groove.

[0016] As a further limitation of the above technical solution, the piston rod is internally provided with a stable positioning mechanism for squeezing the inner wall of the negative pressure cylinder to maintain the stability of cutting tumor tissue.

[0017] A further limitation of the above technical solution is that the stable positioning mechanism includes a slide groove opened on the piston rod and connected to the built-in groove, and a guide ring seat is fixedly connected to the piston rod along the direction of the slide groove, and an elastic pressure rod is slidably connected through the slide groove and the guide ring seat; two groups of elastic pressure rods are symmetrically arranged about the axis in the piston rod, and the end faces of the elastic pressure rods are in contact with the inner wall of the negative pressure cylinder.

[0018] To further limit the above technical solution, the elastic pressure rod is provided with a side groove at one end close to the twist transmission rod, and a rotating support rod is rotatably connected to the inside of the side groove in the elastic pressure rod; convex plates are fixedly installed on both sides of the lower end surface of the twist groove positioning plate, the convex plates are rotatably connected to the rotating support rod, and the rotating support rod is obliquely arranged on the outside of the positioning spring.

[0019] Compared with the prior art, the present invention has the following beneficial effects: (1) Rotational cutting of tumor tissue: The twist groove positioning disk is controlled to move longitudinally inside the piston rod. The twist groove positioning disk is mounted on the outside of the twist transmission rod and moves. The twist transmission rod can be controlled to rotate under the spiral transmission. The twist transmission rod drives the solid needle fixed at the lower end to rotate synchronously. The triangular blade head at the lower end of the solid needle can be rotated to cut off the tumor tissue, so that the tumor tissue attracted into the hollow needle tube by negative pressure can be quickly separated.

[0020] By pressing the power rod, the longitudinal movement of the twist groove positioning disk can be controlled. When the power rod is pressed and moved, the upper return spring, the lower return spring and the positioning spring are elastically deformed. When the pressing force is removed, the elastic thrust of each spring can push the power rod to move and reset, thereby realizing intermittent pressing operation of the power rod and continuously providing power for the movement of the twist groove positioning disk.

[0021] (2) Stable tissue cutting: When the twist groove positioning disk moves longitudinally to control the solid needle and the triangular blade to rotate and cut the tissue, the elastic pressure rod can be pushed to move horizontally under the transmission of the convex disk and the rotating support rod. The elastic pressure rod is elastically squeezed on the inner wall of the negative pressure cylinder. Under the squeezing action, the piston rod can be kept firmly set inside the negative pressure cylinder at this time, avoiding the longitudinal movement of the piston rod when cutting the tissue and pushing the solid needle outward to puncture the patient's body tissue, thereby improving the safety of the sampling operation.

[0022] (3) Stable tissue sampling: Before sampling, the solid needle is controlled to move toward the outside of the hollow needle tube, and the piston rod is stretched to form a negative pressure force inside the negative pressure cylinder. The tumor tissue enters the hollow needle tube under the action of negative pressure, and the piston rod can drive the solid needle to move synchronously into the hollow needle tube. Then, the solid needle and the triangular blade are controlled to rotate and cut the tumor tissue. The cut tissue remains inside the hollow needle tube, and the triangular blade is limited at the end face of the hollow needle tube, which can prevent the tissue from falling out of the hollow needle tube when the sampler is withdrawn. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 The figure is a schematic diagram of the hollow needle structure of a neurosurgery tumor sampler of the present invention.

[0025] Figure 2 The figure is a schematic diagram of the cross-sectional structure of a negative pressure cylinder of a neurosurgery tumor sampler according to the present invention.

[0026] Figure 3 The figure is a schematic structural diagram of a triangular blade head of a neurosurgery tumor sampler according to the present invention.

[0027] Figure 4 The figure is a schematic diagram of the piston disk structure of a neurosurgery tumor sampler of the present invention.

[0028] Figure 5 The figure is a schematic diagram of the piston rod structure of a neurosurgery tumor sampler of the present invention.

[0029] Figure 6 The figure is a schematic diagram of the structure of a pressing power rod of a neurosurgery tumor sampler of the present invention.

[0030] Figure 7 The figure is a schematic diagram of the elastic pressure rod structure of a neurosurgery tumor sampler of the present invention.

[0031] Figure 8 The figure is a schematic diagram of the structure of a twisted transmission rod of a neurosurgery tumor sampler according to the present invention.

[0032] Figure 9 The figure is a schematic diagram of the positioning spring structure of a neurosurgery tumor sampler of the present invention.

[0033] Figure 10 The figure is a schematic diagram of the rotating support structure of a neurosurgery tumor sampler of the present invention.

[0034] Figure 11 The figure is a schematic diagram of the linkage plate structure of a neurosurgery tumor sampler of the present invention.

[0035] Figure 12 The figure is a schematic structural diagram of an upper return spring and a lower return spring of a neurosurgery tumor sampler according to the present invention.

[0036] Among them, 1. negative pressure cylinder; 2. hollow needle tube; 3. solid needle; 31. triangular blade head; 4. sealing column; 5. piston rod; 51. built-in groove; 52. slide groove; 6. piston disc; 7. pressure channel; 8. fixed seat; 9. twist transmission rod; 10. twist groove positioning disc; 11. slideway; 12. disc seat; 13. pressing power rod; 131. embedded groove; 132. upper return spring; 133. lower return spring; 14. linkage plate; 15. guide ring seat; 16. elastic pressure rod; 17. side groove; 18. rotating support rod; 19. convex disc; 20. positioning spring. DETAILED DESCRIPTION

[0037] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art will make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0038] Example 1 This embodiment provides a neurosurgery tumor sampler, such as Figures 1-6 As shown, the negative pressure cylinder 1 provides negative pressure to attract tumor tissue. A hollow needle tube 2 for collecting tumor tissue is mounted at the lower end of the negative pressure cylinder 1. A solid needle 3 is movably connected to the hollow needle tube 2 along the axis. Two sets of triangular blades 31 are symmetrically arranged on the end face of the solid needle 3 about the axis. A sealing column 4 is fixedly engaged with the upper end of the negative pressure cylinder 1. A piston rod 5 is slidably connected to the sealing column 4. A piston disk 6 is fixedly mounted at the end of the piston rod 5. The solid needle 3 is rotatably connected to the lower end face of the piston disk 6. A built-in groove 51 is provided in the piston rod 5. A steering mechanism for driving the solid needle 3 to rotate and cut the tumor tissue is provided in the built-in groove 51. The piston rod 5 is also provided with a pressing drive mechanism for applying pressure to the steering mechanism. A pressure channel 7 is provided inside the negative pressure cylinder 1, near one end of the hollow needle tube 2. The solid needle 3 is disposed through the pressure channel 7.

[0039] refer to Figure 4-Figure 9 The steering power mechanism includes a fixed seat 8 fixedly mounted in a built-in groove 51 within the piston rod 5. A twisted transmission rod 9 is rotatably mounted in the fixed seat 8. The twisted transmission rod 9 is centrally mounted and rotatably disposed in the built-in groove 51 along the axis direction, and the lower end surface of the twisted transmission rod 9 is fixedly connected to the solid needle 3. The twisted transmission rod 9 is spirally sleeved on the outside with a twisted groove positioning plate 10, which is longitudinally movable in the built-in groove 51. The lower end surface of the twisted groove positioning plate 10 is elastically connected to the upper end surface of the fixed seat 8, and the positioning spring 20 is sleeved on the outside of the twisted transmission rod 9.

[0040] refer to Figure 5 、 Figure 6 、 Figure 11 and Figure 12 The push-type drive mechanism includes a slideway 11 provided in the negative pressure cylinder 1 and connected to the built-in groove 51. A disc seat 12 is fixedly mounted in the slideway 11. A push-type power rod 13 is slidably connected to the disc seat 12 and is slidably disposed within the slideway 11. Two sets of linkage plates 14 are fixed to the lower end surface of the push-type power rod 13, and the two sets of linkage plates 14 are respectively fixedly connected to the two sides of the twist groove positioning plate 10. An embedded groove 131 is provided on the push-type power rod 13. An upper return spring 132 is elastically connected between the push-type power rod 13 and the upper end surface of the disc seat 12. A lower return spring 133 is elastically connected between the push-type power rod 13 and the lower end surface of the disc seat 12. The upper return spring 132 and the lower return spring 133 are embedded in the embedded groove 131.

[0041] Control the hollow needle tube 2 to puncture into the patient's body so that the needle tip of the hollow needle tube 2 is located at the tumor tissue. First, push the piston rod 5 downward, and the piston rod 5 drives the piston disk 6 and the solid needle 3 to move downward synchronously, and the solid needle 3 moves away from the hollow needle tube 2. Then, control the piston rod 5 to move upward, and the piston rod 5 drives the piston disk 6 to move upward on the inner wall of the negative pressure cylinder 1. When the piston disk 6 moves, a negative pressure force is formed inside the negative pressure cylinder 1. The tumor tissue is attracted into the hollow needle tube 2 under the action of the negative pressure. At the same time, the piston disk 6 drives the solid needle 3 to move into the interior of the hollow needle tube 2, thereby quickly achieving the attraction of the tumor tissue.

[0042] If you want to press the power rod 13 to apply downward pressure, the power rod 13 is pressed to pass through the slide 11 and move downward, and it drives the twist groove positioning plate 10 to move downward synchronously through the linkage plate 14. The twist groove positioning plate 10 is sleeved on the outside of the twist transmission rod 9. Under the action of the spiral transmission, the twist transmission rod 9 can control the rotation of the twist transmission rod 9. The twist transmission rod 9 drives the solid needle 3 fixed at the lower end to rotate synchronously. The triangular blade head 31 on the end face of the solid needle 3 rotates to cut off the tumor tissue, so that the tissue remains in the hollow needle tube 2. When the sampler is withdrawn from the patient's body after sampling, the tissue can stay more stably in the hollow needle tube 2 under the blocking limit of the triangular blade head 31, thereby preventing the sampled tissue from falling out when the sampler is withdrawn.

[0043] When the pressing power rod 13 moves longitudinally in the slide 11, the upper return spring 132 and the lower return spring 133 are elastically compressed, and the pressing power rod 13 drives the twist groove positioning disk 10 to move synchronously, and the positioning spring 20 is compressed. When the pressure applied to the pressing power rod 13 is removed, under the elastic thrust of the upper return spring 132, the lower return spring 133 and the positioning spring 20, the pressing power rod 13 and the twist groove positioning disk 10 can be controlled to move upward and reset. In this way, pressure can be applied to the pressing power rod 13 repeatedly to keep the solid needle 3 and the triangular cutter head 31 able to rotate back and forth continuously, thereby quickly rotating and cutting off the tumor tissue.

[0044] Example 2 refer to Figures 4-10 The piston rod 5 is internally provided with a stable positioning mechanism that squeezes the inner wall of the negative pressure cylinder 1 to maintain the stability of the tumor tissue being cut. The stable positioning mechanism includes a slide groove 52 formed on the piston rod 5 and extending through the internal groove 51. A guide ring seat 15 is fixedly connected to the piston rod 5 along the direction in which the slide groove 52 is formed. Elastic pressure rods 16 are slidably connected to both the slide groove 52 and the guide ring seat 15. Two sets of elastic pressure rods 16 are symmetrically arranged about the axis of the piston rod 5, and the end faces of the elastic pressure rods 16 are in contact with the inner wall of the negative pressure cylinder 1.

[0045] refer to Figure 7-10 , the elastic pressure rod 16 is provided with a side groove 17 at one end close to the twist transmission rod 9, and the elastic pressure rod 16 is rotatably connected to the internal part of the side groove 17 with a rotating support rod 18; both sides of the lower end surface of the twist groove positioning plate 10 are fixedly mounted with convex plates 19, which are rotatably connected to the rotating support rod 18, and the rotating support rod 18 is tilted and arranged on the outside of the positioning spring 20.

[0046] When pressure is applied to the pressing power rod 13 to drive the twist groove positioning disk 10 to move longitudinally, the convex plate 19 fixed on the twist groove positioning disk 10 moves synchronously. At this time, the two ends of the rotating support rod 18 connected between the convex plate 19 and the elastic pressure rod 16 rotate accordingly. The rotating support rod 18 in the rotating state can push the elastic pressure rod 16 to move horizontally in the guide ring seat 15. The elastic pressure rod 16 moves horizontally and is pressed against the inner wall of the negative pressure cylinder 1. Under the limiting action of the elastic pressure rod 16, the piston rod 5 can be kept in the position where it stays inside the negative pressure cylinder 1 at this time, preventing the movement of the piston rod 5 from causing the solid needle 3 to move outward and pierce the patient's body tissue, thereby improving the safety of the tumor sampler operation.

[0047] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, which is convenient for those skilled in the art to understand and apply the present invention. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art of the present invention, several simple deductions or substitutions can be made without departing from the concept of the present invention, without having to go through creative work. Therefore, based on the disclosure of the present invention, simple improvements made to the present invention by those skilled in the art should be within the scope of protection of the present invention.

Claims

1. A neurosurgery tumor sampler, comprising a negative pressure cylinder (1) for providing negative pressure to attract tumor tissue, a hollow needle tube (2) for collecting tumor tissue being installed at the lower end of the negative pressure cylinder (1), characterized in that: A solid needle (3) is movably connected to the hollow needle tube (2) along the axis direction, and two sets of triangular cutter heads (31) are symmetrically arranged on the end surface of the solid needle (3); A sealing column (4) is fixedly embedded in the upper end of the negative pressure cylinder (1), a piston rod (5) is slidably connected to the sealing column (4), a piston disc (6) is fixedly installed at the end of the piston rod (5), and a solid needle (3) is rotatably connected to the lower end surface of the piston disc (6); A built-in groove (51) is provided inside the piston rod (5), and a steering power mechanism for driving the solid needle (3) to rotate and cut the tumor tissue is provided in the built-in groove (51), and a pressing drive mechanism for applying pressure to the steering power mechanism is provided in the piston rod (5).

2. The neurosurgery tumor sampler according to claim 1, characterized in that: The negative pressure cylinder (1) has a pressure channel (7) formed inside one end of the negative pressure cylinder (1) near the hollow needle tube (2), and the solid needle (3) is arranged to penetrate the pressure channel (7).

3. The neurosurgery tumor sampler according to claim 1, characterized in that: The steering power mechanism comprises a fixed seat (8) fixedly mounted in a built-in groove (51) inside the piston rod (5), and a twisted transmission rod (9) rotatably mounted in the fixed seat (8); The twist transmission rod (9) is centrally rotatably arranged in the built-in groove (51) along the axis direction, and the lower end surface of the twist transmission rod (9) is fixedly connected to the solid needle (3).

4. The neurosurgery tumor sampler according to claim 3, characterized in that: The twist transmission rod (9) is provided with a twist groove positioning plate (10) on the outside of the twist transmission rod (9), and the twist groove positioning plate (10) is longitudinally movably arranged in the built-in groove (51).

5. The neurosurgery tumor sampler according to claim 4, characterized in that: The twist groove positioning plate (10) has a positioning spring (20) elastically connected to the upper end surface of the fixing seat (8) at its lower end surface. The positioning spring (20) is sleeved on the outside of the twist transmission rod (9).

6. The neurosurgery tumor sampler according to claim 1, characterized in that: The pressing drive mechanism comprises a slideway (11) provided in the negative pressure cylinder (1) and connected to the built-in groove (51), a disc seat (12) being fixedly installed in the slideway (11), a pressing power rod (13) being slidably connected to the disc seat (12), and the pressing power rod (13) being slidably arranged inside the slideway (11); The lower end surface of the power rod (13) is pressed to fix two groups of linkage plates (14), and the two groups of linkage plates (14) are respectively fixedly connected to the positions on both sides of the twist groove positioning plate (10).

7. The neurosurgery tumor sampler according to claim 6, characterized in that: An embedded groove (131) is provided on the pressing power rod (13), an upper return spring (132) is elastically connected between the pressing power rod (13) and the upper end surface of the disc seat (12), and a lower return spring (133) is elastically connected between the pressing power rod (13) and the lower end surface of the disc seat (12); The upper return spring (132) and the lower return spring (133) are embedded in the inner groove (131).

8. The neurosurgery tumor sampler according to claim 5, characterized in that: The piston rod (5) is internally provided with a stable positioning mechanism for squeezing the inner wall of the negative pressure cylinder (1) to maintain the stability of the cut tumor tissue.

9. The neurosurgery tumor sampler according to claim 8, characterized in that: A stable positioning mechanism includes a slide groove (52) provided on the piston rod (5) and connected to the built-in groove (51), and a guide ring seat (15) is fixedly connected to the piston rod (5) along the direction in which the slide groove (52) is provided, and an elastic pressure rod (16) is slidably connected to both the slide groove (52) and the guide ring seat (15); Two groups of elastic pressure rods (16) are symmetrically arranged about the axis in the piston rod (5), and the end faces of the elastic pressure rods (16) are fitted on the inner wall of the negative pressure cylinder (1).

10. The neurosurgery tumor sampler according to claim 9, characterized in that: An elastic pressure rod (16) is provided with a side groove (17) at one end close to the twist transmission rod (9), and a rotating support rod (18) is rotatably connected to the inside of the side groove (17) of the elastic pressure rod (16); Both sides of the lower end surface of the twist groove positioning plate (10) are fixedly mounted with convex plates (19), the convex plates (19) are rotatably connected to the rotating support rod (18), and the rotating support rod (18) is tilted and arranged outside the positioning spring (20).

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