A tumor puncture sampling device

Abstract

The present application relates to the technical field of medical equipment, in particular to a puncture sampling device for tumor, which comprises a main body, a sleeve, a needle core, a limiting mechanism, an exciting mechanism and a plugging mechanism; the present application changes the shape of the front end of the needle core, so that the end face of the front end of the sampling groove is flush with the end face of the front end of the needle core, thereby directly cutting the tumor tissue in the process of the needle core piercing into the tumor tissue, and the problem that the tumor tissue is pushed away by the puncture needle with a solid cylindrical front end in the prior art does not exist; the tissue sample and the tumor tissue around it are cut off in the process of the sleeve piercing in; when the sleeve moves a preset distance, the plugging mechanism cuts off the front end of the tissue in the sampling groove, so that the sample is completely separated from the tumor tissue, and the plugging component plugs the gap between the needle core and the sleeve to prevent the tissue sample from separating from the sampling groove. The present application solves the problem that the tissue sampling amount is insufficient due to the tumor tissue being pushed away by the needle core when the puncture sampling needle in the prior art performs puncture sampling.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a tumor biopsy device. Background Technology

[0002] Tumor biopsy is a minimally invasive technique that uses a needle to obtain tissue samples from lesions for pathological diagnosis. The procedure requires a biopsy gun and a coaxial needle. The coaxial needle is an auxiliary positioning device consisting of an outer guiding sheath and a detachable inner core. Its principle is as follows: during the procedure, under image guidance, the physician inserts the outer sheath to the edge of the lesion, removes the inner core, and then inserts the biopsy needle through the internal channel of the sheath to collect the sample. This avoids repeated punctures that could cause tumor tissue to detach and spread into normal tissue. By using a coaxial needle, the chance of tumor cells coming into contact with normal tissue is minimized, significantly reducing the risk of needle tract seeding and spread, as well as puncture trauma and bleeding.

[0003] The core equipment in the puncture sampling process—the biopsy gun—includes a needle core, a hollow cannula, a triggering device, and a tissue sample slot. During puncture sampling, the needle is positioned over the target tumor area, and then the triggering device is activated. The built-in spring or pneumatic system instantly releases power, propelling the needle core at high speed into the tumor tissue. Subsequently, the outer cannula rapidly moves forward to cut and extract the tumor tissue, sealing it within the tissue sample slot. The biopsy gun achieves precise cutting through the instantaneous conversion of mechanical energy, providing samples for pathological analysis. However, existing biopsy needles, such as those disclosed in Chinese patent application CN118680640A and Chinese patent CN221599985U, have solid cylindrical tips at the tip of the needle core. When inserted into the tumor, these tips push away the tissue, resulting in insufficient tissue sample volume. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention proposes a tumor puncture sampling device, which solves the problem of insufficient tissue sample volume when using a puncture biopsy gun in the prior art.

[0005] The tumor biopsy sampling device of the present invention adopts the following technical solution, including:

[0006] The main body extends in the front-to-back direction, and its interior is hollow.

[0007] The sleeve extends in the front-to-back direction, with the rear end of the sleeve slidingly mounted on the main body and the front end extending out of the main body. The end face of the front end of the sleeve is a bevel.

[0008] The needle core extends in the front-to-back direction, with its rear end slidably mounted inside the sleeve along its own axis, and its front end extending a predetermined distance beyond the sleeve. The end face of the front end of the needle core is beveled, and a sampling groove is provided at the front end of the needle core, extending front-to-back. The end face of the front end of the sampling groove is flush with the end face of the front end of the needle core. A limiting mechanism is installed on the main body, and the limiting mechanism has a limiting state and an unlocking state. When the limiting mechanism is in the limiting state, the sleeve and the needle core are stationary relative to the main body. When the limiting mechanism is in the unlocking state, the sleeve and the needle core slide back and forth when subjected to external force.

[0009] The actuation mechanism is used to slide the needle core and the cannula forward away from the main body, and the distance the cannula slides forward is greater than the distance the needle core slides forward.

[0010] The sealing mechanism is configured to cut off the front end of the tissue in the sampling groove when the cannula is far away from the main body at a preset distance; and to seal the gap between the needle core and the cannula.

[0011] Optionally, the sealing mechanism includes a sealing spring and an adjustment assembly. The sampling groove includes a horizontal plane, which serves as the sampling surface. A mounting groove is provided at the front of the sampling groove, extending in the front-rear direction and being lower than the sampling surface. The front end of the sealing spring is fixedly connected to the mounting groove, and the rear end face of the sealing spring is an inclined surface, with the lower side of the inclined surface located in front of the upper side. The adjustment assembly is used to cause the rear end of the sealing spring to tilt upwards to seal the gap between the sleeve and the needle core when the sleeve moves forward a preset distance relative to the needle core.

[0012] Optionally, the limiting mechanism includes a slide groove, a connecting ring, a moving block, a pull ring, a limiting spring, two limiting rings, and two limiting grooves;

[0013] A sliding groove is formed in the main body and extends along a first direction; a limiting groove extends radially along the main body, with two limiting grooves located at both ends of the sliding groove and communicating with it; two limiting rings are fixedly installed in the two limiting grooves respectively; a connecting ring is fixedly connected to the outer periphery of the sleeve and slidably installed inside the main body; a limiting spring extends radially along the sleeve, with one end fixedly connected to the connecting ring and the other end fixedly connected to the moving block; the moving block extends radially along the sleeve and slidably installed in the sliding groove, with the end of the moving block away from the limiting spring passing through the sliding groove and extending out of the main body, and fixedly connected to the pull ring; a limiting protrusion is fixedly connected to the moving block, and when the moving block moves a preset distance radially outward along the sleeve in the limiting groove, the limiting protrusion abuts against the limiting ring; the limiting spring causes the moving block to tend to move away from the sleeve, so that the limiting protrusion abuts against the limiting ring;

[0014] Optionally, two limiting mechanisms are provided, and the two limiting mechanisms are evenly distributed along the circumference of the sleeve.

[0015] Optionally, the main body is hollow inside, and a screw cap is fixedly connected to the rear end of the main body; the cavity inside the main body is divided into a first cavity and a second cavity, with the first cavity located at the rear end of the second cavity; the diameter of the first cavity is larger than the diameter of the second cavity; the excitation mechanism includes an excitation spring, a first push block, and a second push block; the first push block is slidably installed in the first cavity and fixedly connected to the needle core; the diameter of the first push block is larger than that of the second push block; the second push block is slidably installed in both the first and second cavities; the second push block is fixedly connected to a connecting ring; the second push block is located at the front end of the first push block; the excitation spring is fixedly connected to the front end of the screw cap and extends forward.

[0016] Optionally, when the pull ring is located in the limiting groove near the screw cap, the sampling groove extends out of the sleeve; the length of the first cavity is greater than the length of the sampling groove; the length of the second cavity is greater than twice the length of the first cavity.

[0017] Optionally, in the initial state, the rear end of the sealing spring is higher than the sampling surface; the adjustment assembly includes an adjustment rod; the adjustment rod extends to the left and right and is fixedly connected inside the sleeve, with the adjustment rod lower than the rear end of the sealing spring.

[0018] Optionally, in the initial state, the sealing spring is housed in the mounting slot, and the adjustment assembly includes an adjustment wire and an adjustment spring; the adjustment spring extends forward and backward and is sleeved on the outside of the sleeve, and the rear end of the adjustment spring is fixedly connected to the first push block; two receiving slots are opened on the outer wall of the sleeve, the two receiving slots are arranged opposite each other and extend in the forward and backward direction, and the bottom of the receiving slot is higher than the bottom of the mounting slot; the middle part of the adjustment wire is located on the upper surface of the sampling slot, and both ends pass through the receiving slots and are fixedly connected to the front end of the adjustment spring; the adjustment spring keeps the adjustment wire in a taut state.

[0019] Optionally, the end faces of the cannula and the needle core are parallel.

[0020] Optionally, anti-slip protrusions are provided on the outer peripheral wall of the main body.

[0021] The beneficial effects of this invention are as follows: In the tumor puncture sampling device of this invention, by changing the shape of the needle core tip, the end face of the sampling groove tip is made flush with the end face of the needle core tip. During the needle core insertion into the tumor tissue, unlike existing puncture needles with a solid cylindrical tip that push the tumor tissue away, this device directly cuts the tumor tissue, placing the tumor tissue sample above the sampling groove. During the insertion of the cannula into the tumor tissue, the tissue in the sampling groove is severed from the surrounding tumor tissue, storing the tissue sample in the sampling groove. At this time, the sample tip remains connected to the tumor tissue, while other parts are separated. When the cannula moves a preset distance, the sealing mechanism cuts off the tip of the tissue in the sampling groove, completely separating the sample from the tumor tissue. The sealing component seals the gap between the needle core and the cannula, preventing the tissue sample from detaching from the sampling groove. This invention eliminates the phenomenon of the needle core pushing tissue during a single puncture, solving the problem of insufficient tissue sample volume caused by the needle core pushing away tumor tissue during puncture sampling in existing technologies.

[0022] Building upon this, by incorporating a sealing spring and an adjustment assembly, the sealing spring is tilted upwards during the process of the cannula wrapping the needle core. This cuts off the connection between the tissue sample and the tumor tissue and ensures the sealing spring abuts against the inner wall of the cannula, preventing the sample tissue from detaching from the sampling slot. The sampling volume is further guaranteed by adjusting the steel wire and the adjusting spring. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of a tumor puncture and sampling device according to the present invention.

[0025] Figure 2 This is an explosion diagram of a tumor puncture and sampling device according to the present invention;

[0026] Figure 3 This is a top view of a tumor puncture and sampling device according to the present invention;

[0027] Figure 4 for Figure 3 Sectional view of section AA;

[0028] Figure 5 for Figure 4 Enlarged view at point X;

[0029] Figure 6 This is a front view of a tumor puncture and sampling device according to the present invention;

[0030] Figure 7 For the needle core and cannula at the puncture front Figure 6 Schematic diagram of the section BB cut-out state;

[0031] Figure 8 The present invention provides a tumor biopsy device at the puncture front. Figure 7 Schematic diagram of the cross-section of the middle CC section;

[0032] Figure 9 for Figure 8 Enlarged view at point Y;

[0033] Figure 10 The present invention provides a tumor biopsy device at the puncture front. Figure 7 Schematic diagram of the cut-off state of the DD section;

[0034] Figure 11 for Figure 10 Enlarged view at point Z;

[0035] Figure 12 This is a top view of the tumor puncture sampling device of the present invention after sampling is completed;

[0036] Figure 13 This is a schematic diagram showing the state of the sealing spring after sampling is completed using the tumor puncture and sampling device of the present invention;

[0037] Figure 14 This is a schematic diagram illustrating the adjustment of the steel wire after sampling is completed using a tumor puncture and sampling device according to the present invention.

[0038] Figure 15 This is a schematic diagram of the state of the activation mechanism after sampling is completed in the tumor puncture sampling device of the present invention.

[0039] In the picture:

[0040] 100. Main body; 101. Anti-slip protrusion; 110. Screw cap; 120. First cavity; 130. Second cavity;

[0041] 200, sleeve; 210, receiving groove;

[0042] 300, needle core; 310, sampling groove; 311, sampling surface; 320, mounting groove;

[0043] 400, Limiting mechanism; 410, Slide groove; 420, Connecting ring; 430, Moving block; 431, Limiting protrusion; 440, Pull ring; 450, Limiting spring; 460, Limiting ring; 470, Limiting groove;

[0044] 500. Actuation mechanism; 510. Actuation spring; 520. First push block; 530. Second push block;

[0045] 600, Blocking mechanism; 610, Blocking spring; 620, Adjustment assembly; 621, Adjustment wire; 622, Adjustment spring. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] like Figures 1 to 15 As shown, an embodiment of the present invention provides a tumor puncture and sampling device including a main body 100, a cannula 200, a needle core 300, a limiting mechanism 400, a stimulating mechanism 500, and a blocking mechanism 600.

[0048] The main body 100 extends in the front-to-back direction and is hollow inside; anti-slip protrusions 101 are provided on the outer peripheral wall of the main body 100.

[0049] The sleeve 200 extends in the front-to-back direction. The rear end of the sleeve 200 is slidably installed on the main body 100, and the front end extends out of the main body 100. The end face of the front end of the sleeve 200 is a bevel.

[0050] The needle core 300 extends in the front-to-back direction. The rear end of the needle core 300 is slidably installed in the sleeve 200 along its own axis. The front end of the needle core 300 extends out of the sleeve 200 by a predetermined distance. The end face of the front end of the needle core 300 is inclined. A sampling groove 310 is opened at the front end of the needle core 300. The sampling groove 310 extends in the front-to-back direction. The end face of the front end of the sampling groove 310 is flush with the end face of the front end of the needle core 300. The end face of the sleeve 200 and the front end of the needle core 300 are parallel.

[0051] The limiting mechanism 400 is installed on the main body 100. The limiting mechanism 400 has a limiting state and an unlocking state. When the limiting mechanism 400 is in the limiting state, the sleeve 200 and the needle core 300 are stationary relative to the main body 100. When the limiting mechanism 400 is in the unlocking state, the sleeve 200 and the needle core 300 slide back and forth when subjected to external force.

[0052] The actuation mechanism 500 is used to slide the needle core 300 and the sleeve 200 forward away from the body 100, and the distance that the sleeve 200 slides forward is greater than the distance that the needle core 300 slides forward.

[0053] The sealing mechanism 600 is configured to cut off the front end of the tissue in the sampling groove 310 when the sleeve 200 is a preset distance away from the main body 100; and to seal the gap between the needle core 300 and the sleeve 200.

[0054] During puncture sampling, the needle core 300 and cannula 200 are disinfected, and then moved backward a preset distance. At this time, the limiting mechanism 400 is in a limiting state, and the needle core 300 and cannula 200 are limited and cannot move back and forth. Under image guidance, the doctor punctures the coaxial needle to the edge of the lesion, removes the inner core, holds the main body 100, and inserts the needle core 300 and cannula 200 into the outer sheath of the coaxial needle. After reaching the appropriate depth, the insertion is stopped. At this time, the needle core 300 has not reached the preset puncture depth. At this time, the limiting mechanism 400 is switched to the unlocked state. At the same time, the triggering mechanism 500 causes the needle core 300 and cannula 200 to move forward quickly. Since the front end of the needle core 300 extends out of the cannula 200, the needle core 300 first penetrates to the preset sampling depth, and then the cannula 200 penetrates to the sampling depth. Because the end faces of the needle core 300 and the cannula 200 are parallel, the sharp tip of the needle core 300 and the cutting edge of the cannula 200 form a continuous cutting trajectory during puncture, reducing tissue resistance and avoiding tissue compression or tearing caused by angular deviation; the obtained sample is more complete, and the puncture path cut surface is flat, reducing the risk of needle tract bleeding and tumor cell spread along the needle tract.

[0055] Compared with the prior art, in this invention, the end face of the sampling groove 310 is flush with the end face of the needle core 300. Therefore, during the process of the needle core 300 piercing the tumor tissue, it will not push the tumor tissue away like the puncture needle in the prior art, but will directly cut the tumor tissue. The tumor tissue sample is located above the sampling groove 310. During the process of the cannula 200 piercing the tumor tissue, the tissue on the sampling groove 310 is cut off from the surrounding tissue, and the tissue sample is stored in the sampling groove 310. At this time, the front end of the sample is still connected to the tumor tissue, while the other parts are separated from the tumor tissue. When the cannula 200 moves a preset distance, the sealing mechanism 600 cuts off the front end of the tissue in the sampling groove 310, completely separating the sample from the tumor tissue. The sealing component seals the gap between the needle core 300 and the cannula 200, preventing the tissue sample from detaching from the sampling groove 310. At this point, the sampling is complete. Pulling the main body 100 backward causes the needle core and cannula 200 to move backward synchronously with the main body 100, pulling the tissue sample in the sampling groove 310 away from the tumor tissue. When removing the tissue, the needle core 300 and cannula 200 move backward. After the needle core 300 moves a preset distance, it stops moving, while the cannula 200 continues to move backward, causing the sampling groove 310 to extend beyond the cannula 200, thus facilitating the removal of the tissue sample from the sampling groove 310.

[0056] In a further embodiment, the sealing mechanism 600 includes a sealing spring 610 and an adjustment component 620. The sampling groove 310 includes a horizontal surface, which is the sampling surface 311. The front part of the sampling groove 310 is provided with an installation groove 320, which extends in the front-rear direction and is lower than the sampling surface 311. The front end of the sealing spring 610 is fixedly connected to the installation groove 320, and the rear end face of the sealing spring 610 is a slope, with the lower side of the slope located in front of the upper side. The adjustment component 620 is used to cause the rear end of the sealing spring 610 to tilt upward to seal the gap between the sleeve 200 and the needle core 300 when the sleeve 200 moves forward a preset distance relative to the needle core 300.

[0057] During puncture sampling, the coaxial needle is punctured to the edge of the lesion, the inner core is removed, the main body 100 is held, and the needle core 300 and cannula 200 are inserted into the outer sheath of the coaxial needle. After reaching the appropriate depth, the insertion is stopped, and the limiting mechanism 400 is switched to the unlocked state. At the same time, the triggering mechanism 500 causes the needle core 300 and cannula 200 to move forward quickly. The needle core 300 first penetrates to the preset sampling depth, and then the cannula 200 penetrates to the sampling depth. During the insertion of the needle core 300 into the tumor tissue, the tissue sample passes over the blocking spring 610. When the cannula 200 moves forward a preset distance relative to the needle core 300, the adjusting component 620 causes the rear end of the blocking spring 610 to tilt upward. Since the rear end of the blocking spring 610 is inclined and its lower side is in front of the upper side, the front end of the tissue sample will be cut from bottom to top during the upward tilting of the blocking spring 610, so that the tissue sample is separated from the tumor tissue. After the blocking spring 610 tilts upward, its upper end abuts against the inner wall of the cannula 200. When the puncture needle is withdrawn from the tumor tissue, the front end of the tissue in the sampling groove 310 is blocked by the rear end face and lower surface of the blocking spring 610 and will not detach from the needle core 300.

[0058] In a further embodiment, two limiting mechanisms 400 are provided, and the two limiting mechanisms 400 are evenly distributed along the circumference of the sleeve 200; the limiting mechanism 400 includes a sliding groove 410, a connecting ring 420, a moving block 430, a pull ring 440, a limiting spring 450, two limiting rings 460 and two limiting grooves 470.

[0059] A slide groove 410 is formed in the main body 100 and extends along a first direction; a limiting groove 470 extends radially along the main body 100, with two limiting grooves 470 located at both ends of the slide groove 410 and communicating with it; two limiting rings 460 are fixedly installed in the two limiting grooves 470 respectively; a connecting ring 420 is fixedly connected to the outer periphery of the sleeve 200 and slidably installed inside the main body 100; a limiting spring 450 extends radially along the sleeve 200, with one end fixedly connected to the connecting ring 420 and the other end fixedly connected to the moving block 430; the moving block ... moving block 450 and the other end fixedly connected to the moving block 450. Extending radially along the sleeve 200, the movable block 430 is slidably mounted in the slide groove 410. One end of the movable block 430, away from the limiting spring 450, extends out of the main body 100 through the slide groove 410 and is fixedly connected to the pull ring 440. The movable block 430 is fixedly connected to the limiting protrusion 431. When the movable block 430 moves a preset distance radially outward in the limiting groove 470 along the sleeve 200, the limiting protrusion 431 abuts against the limiting ring 460. The limiting spring 450 causes the movable block 430 to tend to move away from the sleeve 200 so that the limiting protrusion 431 abuts against the limiting ring 460.

[0060] During puncture sampling, the coaxial needle is punctured to the edge of the lesion, the inner core is removed, the main body 100 is held, and the needle core 300 and the cannula 200 are inserted into the outer sheath of the coaxial needle. After reaching the appropriate depth, the insertion is stopped. At this time, the pull ring 440 is located in the rear limiting groove 470, and the limiting spring 450 pushes the moving block 430 radially outward. The limiting protrusion 431 abuts against the limiting ring 460, and the moving block 430 cannot slide back and forth in the sliding groove 410. At this time, the pull ring 440 is pressed inward along the radial direction of the sleeve 200. When the pull ring 440 moves inward, it drives the moving block 430 to move inward synchronously. The limiting spring 450 is compressed and stored. After the pull ring 440 moves inward a preset distance, the limiting protrusion 431 extends into the main body 100 and disengages from the limiting ring 460. The limiting component switches to the unlocked state. After that, the excitation mechanism 500 causes the needle core 300 and the sleeve 200 to move forward quickly. During the forward movement of the sleeve 200, the sleeve 200 drives the connecting ring 420 to move forward synchronously, which in turn drives the limiting spring 450, the moving block 430 and the pull ring 440 to move forward synchronously and slide in the slide groove 410. During this process, the limiting spring 450 cannot release its elastic force. When the pull ring 440 moves into the front limiting groove 470, the moving block 430 can move outward in the limiting groove 470. The limiting spring 450 releases its elastic force, pushing the moving block 430 outward, so that the limiting protrusion 431 abuts against the limiting ring 460, thereby blocking the sleeve from moving back and forth. At this time, the sleeve 200 penetrates to the preset puncture depth, completing the sampling work.

[0061] When it is necessary to remove the tissue, press the pull ring 440 to disengage the limiting protrusion 431 from the limiting ring 460, and pull the pull ring 440 backward to move the sleeve 200 backward, so that the sampling groove 310 is exposed outside the sleeve 200, and the tissue is removed from the sampling groove 310.

[0062] In a further embodiment, the main body 100 is hollow inside, and a screw cap 110 is threadedly connected to the rear end of the main body 100; the cavity inside the main body 100 is divided into a first cavity 120 and a second cavity 130, with the first cavity 120 located at the rear end of the second cavity 130; the diameter of the first cavity 120 is larger than the diameter of the second cavity 130; the excitation mechanism 500 includes an excitation spring 510, a first push block 520, and a second push block 530; the first push block 520 is slidably installed in the first cavity 120 and is fixedly connected to the needle core 300 by screws; the diameter of the first push block 520 is larger than that of the second push block 530; the second push block 530 is slidably installed in the first cavity 120 and the second cavity 130; the second push block 530 is fixedly connected to the connecting ring 420 by screws; the second push block 530 is located at the front end of the first push block 520; the excitation spring 510 is fixedly connected to the front end of the screw cap 110 and extends forward.

[0063] When the pull ring 440 is located in the limiting groove 470 near the screw cap 110, the sampling groove 310 extends out of the sleeve 200; the length of the first cavity 120 is greater than the length of the sampling groove 310; the length of the second cavity 130 is greater than twice the length of the first cavity 120.

[0064] During the sampling preparation stage, press the pull ring 440 and pull it backward, causing the moving block 430 to reach the rear limiting groove 470. As the pull ring 440 moves backward, the sleeve 200 moves backward through the moving block 430, the limiting spring 450, and the connecting ring 420. When the connecting ring 420 moves backward, it drives the second push block 530 to move backward. After the second push block 530 moves backward a preset distance, its rear end abuts against the front end of the first push block 520. As the second push block 530 continues to move backward, it drives the first push block 520 to move backward, compressing the excitation spring 510 and activating the spring 510 to store force. When the moving block 430 reaches the rear limiting groove 470, the limiting spring 450 pushes the moving block 430 to move outward, and the limiting protrusion 431 abuts against the limiting ring 460. The moving block 430 cannot slide back and forth, so the excitation spring 510 cannot release its elastic force.

[0065] When the needle core 300 and the cannula 200 are inserted into the tumor tissue from the outer sheath of the coaxial needle and reach the appropriate depth, the pull ring 440 is pushed inward to disengage the limiting protrusion 431 from the limiting ring 460. At this time, the spring 510 is activated to release its elastic force, pushing the first push block 520 forward. The first push block 520 pushes the second push block 530 forward, and the two slide forward synchronously in the first cavity 120. The first push block 520 drives the needle core 300 forward, and the second push block 530 drives the cannula 200 forward. When the front end of the first push block 520 reaches the connection position between the first cavity 120 and the second cavity 130, the first push block 520 is blocked by the main body 100 and stops moving forward. The needle core 300 also stops moving forward. At this time, the needle core 300 is inserted into the preset puncture depth. The second push block 530 continues to move forward under the action of inertia. When the second push block 530 moves, it drives the cannula 200 forward synchronously. When the moving block 430 moves into the front limiting groove 470, the distance that the second push block 530 moves forward is more than twice the distance that the first push block 520 moves forward. When the puncture is completed, the needle core 300 is located inside the cannula 200, and the tissue sample is located between the needle core 300 and the cannula 200.

[0066] In a further embodiment, in the initial state, the rear end of the sealing spring 610 is higher than the sampling surface 311; the adjustment assembly 620 includes an adjustment rod; the adjustment rod extends to the left and right and is fixedly connected inside the sleeve 200, and the adjustment rod is lower than the rear end of the sealing spring 610.

[0067] After the needle core 300 penetrates the tumor tissue to the preset puncture depth, the cannula 200 continues to move forward under the action of inertia. The adjusting rod passes under the tissue sample in the sampling slot 310. As the cannula 200 continues to move, the adjusting rod contacts the rear end face of the sealing spring 610, causing the sealing spring 610 to deform. The rear end of the sealing spring 610 tilts upward, cutting off the front end of the tissue sample and sealing the tissue sample between the needle core 300 and the cannula 200.

[0068] Reference Figure 7 , Figure 11 , Figure 13 , Figure 14 and Figure 15In one preferred embodiment of the present invention, in the initial state, the sealing spring 610 is housed in the mounting groove 320. The adjusting assembly 620 includes an adjusting wire 621 and an adjusting spring 622. The adjusting spring 622 extends back and forth and is sleeved on the outside of the sleeve 200. The rear end of the adjusting spring 622 is fixedly connected to the first push block 520. Two receiving grooves 210 are formed on the outer wall of the sleeve 200. The two receiving grooves 210 are arranged opposite to each other and extend in the front-back direction. The bottom height of the receiving groove 210 is higher than the bottom height of the mounting groove 320. The middle part of the adjusting wire 621 is located on the upper surface of the sampling groove 310, and both ends pass through the receiving grooves 210 and are fixedly connected to the front end of the adjusting spring 622. The adjusting spring 622 keeps the adjusting wire 621 in a taut state.

[0069] After the needle core 300 penetrates the preset puncture depth into the tumor tissue, the cannula 200 continues to move forward under inertia. The adjusting wire 621 moves forward from the sampling surface 311. During this process, the adjusting spring 622 stretches and stores force. After the adjusting wire 621 enters the mounting groove 320, the adjusting spring 622 releases part of its elasticity, putting the adjusting wire 621 under tension. In the projection of the vertical section, the adjusting wire 621 located in front of the needle core 300... Figure 7 The state shown, where the middle part bulges upward, becomes like... Figure 14 As shown in the diagram, the tube 200 continues to move forward. As the tube 200 continues to move, the adjusting wire 621 contacts the rear end face of the sealing spring 610, causing the sealing spring 610 to deform. The rear end of the sealing spring 610 tilts upward, cutting off the front end of the tissue sample during this upward tilt. Because the bottom of the receiving groove 210 is higher than the bottom of the mounting groove 320, the tilting height of the sealing spring 610 is maintained as the tube 200 moves forward, ensuring that the sealing spring 610 abuts against the upper surface of the tube 200, thereby sealing the tissue sample between the needle core 300 and the tube 200.

[0070] Compared to the embodiment with the adjusting rod, in the embodiment with the adjusting rod, the upper surface of the rear end of the sealing spring 610 needs to be higher than the sampling surface 311 of the sampling groove 310 in the initial state. Only when the adjusting rod moves forward can the sealing spring 610 undergo elastic deformation, cut off the tissue, and seal the gap between the needle core 300 and the cannula 200. This embodiment reduces the degree to which the needle core 300 pushes away the tumor tissue to a certain extent. However, since the upper surface of the rear end of the sealing spring 610 is higher than the sampling surface 311 of the sampling groove 310, there is still a problem of insufficient tissue sample volume in the sampling groove 310. In the embodiment with the adjusting wire 621 and the adjusting spring 622, since the sealing spring 610 is completely housed in the mounting groove 320 in the initial state, the tissue sample will not be pushed away during the process of entering the sampling groove 310, which further solves the problem of insufficient sample volume caused by the tissue sample being blocked during the process of entering the sampling groove 310.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tumor biopsy sampling device, characterized in that, include: The main body extends in the front-to-back direction, and its interior is hollow. The sleeve extends in the front-to-back direction. The rear end of the sleeve is slidably installed on the main body, and the front end extends out of the main body. The end face of the front end of the sleeve is a bevel. The needle core extends in the front-to-back direction, with its rear end slidably mounted inside the sleeve along its own axis, and its front end extending a predetermined distance beyond the sleeve. The end face of the front end of the needle core is beveled, and a sampling groove is provided at the front end of the needle core, extending front-to-back. The end face of the front end of the sampling groove is flush with the end face of the front end of the needle core. A limiting mechanism is installed on the main body, and the limiting mechanism has a limited state and an unlocked state. When the limiting mechanism is in the limited state, the sleeve and the needle core are stationary relative to the main body. When the limiting mechanism is in the unlocked state, the sleeve and the needle core slide back and forth when subjected to external force. The limiting mechanism includes a sliding groove, a connecting ring, a moving block, a pull ring, a limiting spring, two limiting rings, and two limiting grooves. A sliding groove is formed in the main body and extends along a first direction; a limiting groove extends radially along the main body, with two limiting grooves located at both ends of the sliding groove and communicating with it; two limiting rings are fixedly installed in the two limiting grooves respectively; a connecting ring is fixedly connected to the outer periphery of the sleeve and slidably installed inside the main body; a limiting spring extends radially along the sleeve, with one end fixedly connected to the connecting ring and the other end fixedly connected to the moving block; the moving block extends radially along the sleeve and slidably installed in the sliding groove, with the end of the moving block away from the limiting spring passing through the sliding groove and extending out of the main body, and fixedly connected to the pull ring; a limiting protrusion is fixedly connected to the moving block, and when the moving block moves a preset distance radially outward along the sleeve in the limiting groove, the limiting protrusion abuts against the limiting ring; the limiting spring causes the moving block to tend to move away from the sleeve, so that the limiting protrusion abuts against the limiting ring; The actuation mechanism is used to slide the needle core and cannula forward away from the main body, and the distance the cannula slides forward is greater than the distance the needle core slides forward. The sealing mechanism is configured to cut off the front end of the tissue in the sampling groove when the cannula moves away from the main body by a preset distance; and to seal the gap between the needle core and the cannula. The sealing mechanism includes a sealing spring and an adjustment assembly. The sampling groove includes a horizontal plane, which is the sampling surface. An installation groove is provided at the front of the sampling groove, which extends in the front-rear direction and is lower than the sampling surface. The front end of the sealing spring is fixedly connected to the installation groove, and the rear end face of the sealing spring is an inclined plane, with the lower side of the inclined plane located in front of the upper side. The adjustment assembly is used to cause the rear end of the sealing spring to tilt upward to seal the gap between the cannula and the needle core when the cannula moves forward a preset distance relative to the needle core.

2. The tumor biopsy device according to claim 1, characterized in that, There are two limiting mechanisms, which are evenly distributed along the circumference of the sleeve.

3. The tumor biopsy device according to claim 2, characterized in that, The main body is hollow inside, and a screw cap is fixedly connected to the rear end of the main body; the cavity inside the main body is divided into a first cavity and a second cavity, with the first cavity located at the rear end of the second cavity; the diameter of the first cavity is larger than the diameter of the second cavity; the excitation mechanism includes an excitation spring, a first push block, and a second push block; the first push block is slidably installed in the first cavity and fixedly connected to the needle core; the diameter of the first push block is larger than that of the second push block; the second push block is slidably installed in both the first and second cavities; the second push block is fixedly connected to a connecting ring; the second push block is located at the front end of the first push block; the excitation spring is fixedly connected to the front end of the screw cap and extends forward.

4. The tumor biopsy device according to claim 3, characterized in that, When the pull ring is located in the limiting groove near the screw cap, the sampling groove extends out of the sleeve; the length of the first cavity is greater than the length of the sampling groove; the length of the second cavity is greater than twice the length of the first cavity.

5. The tumor biopsy device according to claim 4, characterized in that, In the initial state, the rear end of the sealing spring is higher than the sampling surface; the adjustment assembly includes an adjustment rod; the adjustment rod extends to the left and right and is fixedly connected inside the sleeve, with the adjustment rod lower than the rear end of the sealing spring.

6. The tumor biopsy sampling device according to claim 4, characterized in that, In the initial state, the sealing spring is housed in the mounting slot. The adjustment assembly includes an adjustment wire and an adjustment spring. The adjustment spring extends forward and backward and is sleeved on the outside of the sleeve. The rear end of the adjustment spring is fixedly connected to the first push block. Two receiving slots are opened on the outer wall of the sleeve. The two receiving slots are arranged opposite each other and extend in the forward and backward direction. The bottom of the receiving slot is higher than the bottom of the mounting slot. The middle part of the adjustment wire is located on the upper surface of the sampling slot. Both ends pass through the receiving slots and are fixedly connected to the front end of the adjustment spring. The adjustment spring keeps the adjustment wire in a taut state.

7. The tumor biopsy device according to claim 6, characterized in that, The end faces of the cannula and the needle core are parallel.

8. The tumor biopsy device according to claim 7, characterized in that, Anti-slip protrusions are provided on the outer perimeter wall of the main body.

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