Tumor puncture sampling device

Abstract

The invention relates to the technical field of medical equipment, in particular to a tumor puncture sampling device which comprises a body, a cannula, a needle core, a limiting mechanism, an excitation mechanism and a plugging mechanism. By changing the shape of the front end of the needle core, 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, so that the tumor tissue is directly cut in the process that the needle core pierces the tumor tissue, and the problem that in the prior art, a puncture needle with the front end being a solid cylinder pushes away the tumor tissue is solved; when the cannula is pierced, a tissue sample and tumor tissue around the tissue sample are cut off, and when the cannula moves by 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 assembly plugs a gap between the needle core and the cannula, so that the tissue sample is prevented from being separated from the sampling groove. The problem that in the prior art, when a puncture sampling needle conducts puncture sampling, the needle core pushes away tumor tissue, and consequently the tissue sampling amount is insufficient is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical equipment, in particular to a puncture sampling device for tumors. BACKGROUND

[0002] Tumor puncture biopsy is a minimally invasive technique that obtains a lesion tissue sample for pathological diagnosis through a puncture needle. During the puncture process, a puncture biopsy gun and a coaxial needle are required. The coaxial needle is an auxiliary positioning device that includes an outer guide sheath needle and a detachable inner core. The principle is that during operation, the doctor punctures the outer sheath needle to the edge of the lesion under image guidance, removes the inner core, and then inserts and removes the biopsy needle through the internal channel of the sheath needle for sampling, thereby avoiding repeated puncture and causing tumor tissue to fall off into normal tissue. By using the coaxial needle, the opportunity for tumor cells to contact normal tissue is minimized, significantly reducing the risk of needle tract implantation and diffusion, puncture trauma, and bleeding.

[0003] The core equipment in the puncture sampling process, the puncture biopsy gun, includes a needle core, a hollow sleeve, an activation device, and a tissue sample slot. During puncture sampling, the puncture needle is positioned at the target tumor area, and then the activation device is started. The built-in spring or air pressure system releases power instantaneously, pushing the needle core to penetrate the tumor tissue at high speed. The outer sleeve then moves forward quickly to cut and intercept the tumor tissue and seal it in the tissue sample slot. The puncture biopsy gun achieves precise cutting through instantaneous mechanical energy conversion, providing samples for pathological analysis. However, existing puncture biopsy needles, such as the puncture biopsy needle disclosed in Chinese patent application document CN118680640A and the biopsy puncture needle disclosed in Chinese patent document CN221599985U, have solid cylindrical ends at the front of the needle core, which can push away the tissue when penetrating the tumor, resulting in insufficient tissue sampling. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a puncture sampling device for tumors, which solves the problem of insufficient tissue sampling when using the puncture biopsy gun in the prior art.

[0005] The puncture sampling device for tumors of the present application adopts the following technical solution, which includes: The main body extends in the front-rear direction, and the inside of the main body is hollow. The sleeve extends in the front-rear direction, the rear end of the sleeve is slidingly installed in the main body, the front end of the sleeve extends out of the main body, and the end face of the front end of the sleeve is a beveled surface. The needle core extends along the front-rear direction, the rear end of the needle core is slidingly mounted in the sleeve along the axis of the needle core, and the front end of the needle core extends out of the sleeve by a preset distance; the end face of the front end of the needle core is a bevel, and the front end of the needle core is provided with a sampling groove extending forward and backward; 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; the limiting mechanism is mounted on the main body and 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 forward and backward under the action of external force; The activating mechanism is configured to make the needle core and the sleeve slide forward away from the main body, and the distance by which the sleeve slides forward is greater than the distance by which the needle core slides forward; The blocking mechanism is configured to cut off the front end of the tissue in the sampling groove when the sleeve is away from the main body by a preset distance; and the gap between the needle core and the sleeve is blocked.

[0006] Optionally, the blocking mechanism comprises a blocking spring and an adjusting assembly, the sampling groove comprises a horizontal plane, which is a sampling surface; the front part of the sampling groove is provided with a mounting groove extending along the front-rear direction, and the mounting groove is lower than the sampling surface; the front end of the blocking spring is fixedly connected to the mounting groove, and the rear end of the blocking spring is a bevel, the lower side of which is located forward of the upper side; the adjusting assembly is configured to make the rear end of the blocking spring rise upward to block the gap between the sleeve and the needle core when the sleeve moves forward relative to the needle core by a preset distance.

[0007] Optionally, the limiting mechanism comprises a sliding groove, a connecting ring, a moving block, a pull ring, a limiting spring, two limiting rings, and two limiting grooves; The sliding groove is provided in the main body and extends along a first direction; the limiting grooves extend along the radial direction of the main body and are located at the two ends of the sliding groove and communicate with the sliding groove; the two limiting rings are fixedly installed in the two limiting grooves; the connecting ring is fixedly connected to the outer periphery of the sleeve and slidingly mounted in the main body; the limiting spring extends along the radial direction of the sleeve, one end of the limiting spring is fixedly connected to the connecting ring, and the other end of the limiting spring is fixedly connected to the moving block; the moving block extends along the radial direction of the sleeve and is slidingly mounted in the sliding groove, the end of the moving block away from the limiting spring extends out of the main body through the sliding groove and is fixedly connected to the pull ring; the moving block is fixedly connected to a limiting protrusion, and when the moving block moves outward along the radial direction of the sleeve by a preset distance in the limiting groove, the limiting protrusion abuts against the limiting ring; the limiting spring has a tendency to move the moving block away from the sleeve so that the limiting protrusion abuts against the limiting ring; Optionally, two limiting mechanisms are provided, and the two limiting mechanisms are uniformly distributed along the circumference of the sleeve.

[0008] 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, the first cavity is located at the rear end of the second cavity, the diameter of the first cavity is larger than that of the second cavity; the trigger mechanism comprises a trigger spring, a first push block and a second push block; the first push block is slidingly installed in the first cavity, and the first push block is 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 slidingly installed in the first cavity and the second cavity; the second push block is fixedly connected to the connecting ring; the second push block is located at the front end of the first push block; and the trigger spring is fixedly connected to the front end of the screw cap and extends forward.

[0009] Optionally, when the pull ring is located in the limiting groove close to the screw cap, the sampling groove extends out of the sleeve; the length of the first cavity is greater than that of the sampling groove; and the length of the second cavity is greater than twice the length of the first cavity.

[0010] Optionally, in the initial state, the rear end of the blocking spring is higher than the sampling surface; the adjusting assembly comprises an adjusting rod; the adjusting rod extends leftward and rightward, is fixedly connected to the inside of the sleeve, and is lower than the rear end of the blocking spring.

[0011] Optionally, in the initial state, the blocking spring is accommodated in the mounting groove, and the adjusting assembly comprises an adjusting spring and an adjusting wire; the adjusting spring extends forward and backward, is sleeved outside the sleeve, and has a rear end fixedly connected to the first push block; two accommodating grooves are formed in the outer wall of the sleeve, are oppositely arranged, extend in the forward and backward directions, and have a bottom height higher than that of the mounting groove; the middle part of the adjusting wire is located on the upper surface of the sampling groove, and both ends of the adjusting wire pass through the accommodating grooves and are fixedly connected to the front end of the adjusting spring; and the adjusting spring keeps the adjusting wire in a tensioned state.

[0012] Optionally, the end faces of the front ends of the sleeve and the needle core are parallel.

[0013] Optionally, anti-skid protrusions are arranged on the outer peripheral wall of the main body.

[0014] The beneficial effects of the present application are: in the tumor puncture sampling device, by changing the shape of the front end of the needle core, the end face of the sampling groove is flush with the end face of the front end of the needle core. In the process of the needle core penetrating into the tumor tissue, the tumor tissue is not pushed away like the puncture needle with a solid cylindrical front end in the prior art, but is directly cut, so that the tumor tissue sample is located above the sampling groove. In the process of the cannula penetrating into the tumor tissue, the tissue above the sampling groove is cut off from the surrounding tumor tissue, and the tissue sample is stored in the sampling groove. At this time, the front end of the sample is still connected with the tumor tissue, and the other positions are separated from the tumor tissue. When the cannula moves a predetermined distance, the blocking 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 blocking assembly blocks the gap between the needle core and the cannula to prevent the tissue sample from separating from the sampling groove. In the process of single puncture, there is no phenomenon that the needle core pushes the tissue, and the problem that the tissue sampling amount is insufficient caused by the needle core pushing away the tumor tissue during puncture sampling in the prior art is solved.

[0015] On this basis, by setting the blocking spring and the adjusting assembly, in the process of the cannula wrapping the needle core, the blocking spring is raised upward by the adjusting assembly to cut off the position where the tissue sample is connected with the tumor tissue, and the blocking spring is in abutment with the inner wall of the cannula to prevent the sample tissue from separating from the sampling groove. By cooperating the adjusting wire and the adjusting spring, the sampling amount is further ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is a schematic diagram of the overall structure of the tumor puncture sampling device of the present application. Figure 2 It is an exploded schematic diagram of the tumor puncture sampling device of the present application. Figure 3 It is a top view of the tumor puncture sampling device of the present application. Figure 4 It is Figure 3 It is a cross-sectional view of A-A in the middle. Figure 5 It is Figure 4 It is an enlarged view of X in the middle. Figure 6 It is a front view of the tumor puncture sampling device of the present application. Figure 7 It is a schematic diagram of the needle core and the cannula before punctureFigure 6 A schematic view of the middle B-B cross section; Figure 8 A schematic view of the middle B-B cross section; Figure 7 A schematic view of the middle C-C cross section; Figure 9 A schematic view of the middle C-C cross section; Figure 8 A schematic view of the middle Y; Figure 10 A schematic view of the middle B-B cross section; Figure 7 A schematic view of the middle D-D cross section; Figure 11 A schematic view of the middle D-D cross section; Figure 10 A schematic view of the middle Z; Figure 12 A schematic view of the middle D-D cross section; Figure 13 A schematic view of the middle D-D cross section; Figure 14 A schematic view of the middle D-D cross section; Figure 15 A schematic view of the middle D-D cross section.

[0018] In the figure: 100, main body; 101, anti-skid protrusion; 110, rotating cap; 120, first cavity; 130, second cavity; 200, sleeve; 210, accommodating groove; 300, needle core; 310, sampling groove; 311, sampling surface; 320, mounting groove; 400, limiting mechanism; 410, sliding groove; 420, connecting ring; 430, moving block; 431, limiting protrusion; 440, pull ring; 450, limiting spring; 460, limiting ring; 470, limiting groove; 500, triggering mechanism; 510, triggering spring; 520, first push block; 530, second push block; 600, blocking mechanism; 610, blocking sheet; 620, adjusting assembly; 621, adjusting steel wire; 622, adjusting spring. DETAILED DESCRIPTION

[0019] With reference to the drawings and embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0020] As shown in Figures 1 to 15 The tumor puncture sampling device provided by the embodiments of the present application comprises a main body 100, a sleeve 200, a needle core 300, a limiting mechanism 400, an excitation mechanism 500 and a plugging mechanism 600.

[0021] The main body 100 extends in the front-rear direction, and the inside of the main body 100 is hollow. Anti-skid protrusions 101 are arranged on the outer peripheral wall of the main body 100.

[0022] The sleeve 200 extends in the front-rear direction. The rear end of the sleeve 200 is slidingly installed in the main body 100, and the front end of the sleeve 200 extends out of the main body 100. The end face of the front end of the sleeve 200 is beveled.

[0023] The needle core 300 extends in the front-rear direction. The rear end of the needle core 300 is slidingly installed in the sleeve 200 along the axis of the needle core 300, and the front end of the needle core 300 extends out of the sleeve 200 by a preset distance. The end face of the front end of the needle core 300 is beveled. A sampling groove 310 is arranged in the front end of the needle core 300, and the sampling groove 310 extends in the front-rear 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 faces of the front ends of the sleeve 200 and the needle core 300 are parallel.

[0024] The limiting mechanism 400 is installed in 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 in the front-rear direction under the action of an external force.

[0025] The excitation mechanism 500 is configured to make the needle core 300 and the sleeve 200 slide forward away from the main body 100, and the distance by which the sleeve 200 slides forward is greater than the distance by which the needle core 300 slides forward.

[0026] The plugging mechanism 600 is configured to cut off the front end of the tissue in the sampling groove 310 when the sleeve 200 is away from the main body 100 by a preset distance, and to plug the gap between the needle core 300 and the sleeve 200.

[0027] When the puncture sampling is performed, the needle core 300 and the sleeve 200 are sterilized, and then moved backward by a preset distance, at which time the limiting mechanism 400 is in the limiting state, the needle core 300 and the sleeve 200 are limited, and the two cannot move forward and backward, the doctor inserts the coaxial needle into the lesion edge under the image guidance, removes the inner core, holds the main body 100, inserts the needle core 300 and the sleeve 200 into the outer sheath needle of the coaxial needle, and stops the puncture after reaching the appropriate depth, at which time the needle core 300 does not reach the preset puncture depth, at which time the limiting mechanism 400 is switched to the unlocking state, and at the same time, the triggering mechanism 500 promotes the forward rapid movement of the needle core 300 and the sleeve 200, because the front end of the needle core 300 protrudes from the sleeve 200, the needle core 300 first punctures into the preset sampling depth, and then the sleeve 200 punctures into the sampling depth. Because the end faces of the front ends of the needle core 300 and the sleeve 200 are parallel, it is ensured that the sharp tip of the needle core 300 and the cutting edge of the sleeve 200 form a continuous cutting track during puncture, reduce the tissue resistance, and avoid tissue extrusion or tearing caused by angle deviation; the obtained sample is more complete, and the puncture path section is smooth, reducing the risk of needle bleeding and tumor cell diffusion along the needle.

[0028] In the present application, 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, so that in the process of the needle core 300 puncturing into the tumor tissue, the tumor tissue is not pushed away like the puncture needle in the prior art, but is directly cut, and the tumor tissue sample is located above the sampling groove 310. In the process of the sleeve 200 puncturing into the tumor tissue, the tissue above the sampling groove 310 is cut off from the surrounding tissue, and the tissue sample is stored in the sampling groove 310, at which time the front end of the sample is still connected with the tumor tissue, and other positions are separated from the tumor tissue. When the sleeve 200 moves by a preset distance, the blocking mechanism 600 cuts off the front end of the tissue in the sampling groove 310, so that the sample is completely separated from the tumor tissue, and the blocking assembly blocks the gap between the needle core 300 and the sleeve 200, preventing the tissue sample from being separated from the sampling groove 310; at this time, the sampling work is completed, the main body 100 is pulled backward, the needle core and the sleeve 200 move backward synchronously with the main body 100, and the tissue sample in the sampling groove 310 is driven to leave the tumor tissue. When the tissue is taken out, the needle core 300 and the sleeve 200 are moved backward, the needle core 300 stops moving after moving by a preset distance, and the sleeve 200 continues to move backward, so that the sampling groove 310 protrudes from the sleeve 200, thereby facilitating the pouring of the tissue sample from the sampling groove 310.

[0029] In a further embodiment, the plugging mechanism 600 comprises a plugging spring 610 and an adjusting assembly 620, the sampling groove 310 comprises a horizontal surface, which is the sampling surface 311; the front part of the sampling groove 310 is provided with a mounting groove 320, which extends along the front-rear direction and is lower than the sampling surface 311; the front end of the plugging spring 610 is fixedly connected to the mounting groove 320, and the rear end surface of the plugging spring 610 is a bevel surface, the lower side of which is located in front of the upper side; the adjusting assembly 620 is used to make the rear end of the plugging spring 610 tilt upward to block the gap between the sleeve 200 and the needle core 300 when the sleeve 200 moves forward relative to the needle core 300 by a preset distance.

[0030] When the puncture sampling is performed, the coaxial needle is punctured to the edge of the lesion, the inner core is removed, the main body 100 is held, the needle core 300 and the sleeve 200 are inserted into the outer sheath needle of the coaxial needle, and the puncture is stopped after reaching the appropriate depth, so that the limiting mechanism 400 is switched to the unlocked state, at the same time, the triggering mechanism 500 makes the needle core 300 and the sleeve 200 move forward quickly, the needle core 300 first punctures to the preset sampling depth, and then the sleeve 200 punctures to the sampling depth. In the process that the needle core 300 punctures into the tumor tissue, the tissue sample passes above the plugging spring 610, and when the sleeve 200 moves forward relative to the needle core 300 by a preset distance, the adjusting assembly 620 makes the rear end of the plugging spring 610 tilt upward, because the rear end of the plugging spring 610 is a bevel surface and the lower side is located in front of the upper side, so in the process that the plugging spring 610 tilts upward, the front end of the tissue sample is cut from the lower end to the upper end, so that the tissue sample is separated from the tumor tissue, and after the plugging spring 610 tilts upward, the upper end thereof abuts against the inner wall of the sleeve 200, the gap between the sleeve 200 and the needle core 300, when the puncture needle is separated from the tumor tissue, the front end of the tissue in the sampling groove 310 is blocked by the rear end surface and the lower surface of the plugging spring 610, and will not be separated from the needle core 300.

[0031] In a further embodiment, the limiting mechanism 400 is provided with two, which are uniformly distributed along the circumference of the sleeve 200; the limiting mechanism 400 comprises 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.

[0032] The sliding groove 410 is arranged on the main body 100 and extends along a first direction; the limiting grooves 470 extend along the radial direction of the main body 100 and are respectively arranged at the two ends of the sliding groove 410 and communicate with the sliding groove 410; the limiting rings 460 are respectively fixedly arranged in the limiting grooves 470; the connecting ring 420 is fixedly connected to the outer periphery of the sleeve 200 and is arranged in the main body 100 in a forward and backward sliding manner; the limiting spring 450 extends along the radial direction of the sleeve 200, one end of the limiting spring 450 is fixedly connected to the connecting ring 420, and the other end of the limiting spring 450 is fixedly connected to the moving block 430; the moving block 430 extends along the radial direction of the sleeve 200 and is arranged in the sliding groove 410 in a forward and backward sliding manner, one end of the moving block 430 away from the limiting spring 450 extends out of the main body 100 through the sliding groove 410 and is fixedly connected to the pull ring 440; the moving block 430 is fixedly connected to the limiting protrusion 431, when the moving block 430 moves outward along the radial direction of the sleeve 200 by a preset distance in the limiting groove 470, the limiting protrusion 431 abuts against the limiting ring 460; the limiting spring 450 has a tendency to move the moving block 430 away from the sleeve 200 so that the limiting protrusion 431 abuts against the limiting ring 460.

[0033] When the puncture sampling is performed, the coaxial needle is punctured to the edge of a lesion, the inner core is removed, the main body 100 is held, the needle core 300 and the sleeve 200 are inserted into the outer sheath needle of the coaxial needle, and the puncture is stopped after reaching a suitable depth, at this time, the pull ring 440 is located in the limiting groove 470 at the rear side, the limiting spring 450 pushes the moving block 430 outward along the radial direction, the limiting protrusion 431 abuts against the limiting ring 460, and the moving block 430 cannot slide forward and backward 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, the moving block 430 is driven to move inward synchronously, the limiting spring 450 is compressed and stores energy, after the pull ring 440 moves inward by a preset distance, the limiting protrusion 431 extends into the main body 100 and is separated from the abutment of the limiting ring 460, the limiting assembly is switched to the unlocked state, and then the triggering mechanism 500 promotes the forward rapid movement of the needle core 300 and the sleeve 200. In the process of the forward movement of the sleeve 200, the sleeve 200 drives the connecting ring 420 to move forward synchronously, and then drives the limiting spring 450, the moving block 430 and the pull ring 440 to move forward synchronously and slide in the sliding groove 410. In this process, the limiting spring 450 cannot release the elastic force. When the pull ring 440 moves to the limiting groove 470 at the front, the moving block 430 can move outward in the limiting groove 470, the limiting spring 450 releases the elastic force, pushes the moving block 430 to move outward, and makes the limiting protrusion 431 abut against the limiting ring 460, so as to block the forward and backward movement of the sleeve. At this time, the sleeve 200 is punctured to a preset puncture depth, and the sampling work is completed.

[0034] When the tissue needs to be taken out, the pull ring 440 is pressed to make the limiting protrusion 431 disengage from the limiting ring 460, and the pull ring 440 is pulled backward to drive the sleeve 200 to move backward, so that the sampling groove 310 is exposed outside the sleeve 200, and the tissue is taken out from the sampling groove 310.

[0035] In a further embodiment, the main body 100 is hollow inside, and the rear end of the main body 100 is threadedly connected with the screw cap 110; the cavity inside the main body 100 is divided into a first cavity 120 and a second cavity 130, and the first cavity 120 is located at the rear end of the second cavity 130; the diameter of the first cavity 120 is greater than that of the second cavity 130; the trigger mechanism 500 includes a trigger spring 510, a first push block 520 and a second push block 530; the first push block 520 is slidingly installed in the first cavity 120, and the first push block 520 is fixedly connected to the needle core 300 by a screw; the diameter of the first push block 520 is greater than that of the second push block 530; the second push block 530 is slidingly 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 a screw; the second push block 530 is located at the front end of the first push block 520; and the trigger spring 510 is fixedly connected to the front end of the screw cap 110 and extends forward.

[0036] When the pull ring 440 is located in the limiting groove 470 close to the screw cap 110, the sampling groove 310 extends out of the sleeve 200; the length of the first cavity 120 is greater than that of the sampling groove 310; and the length of the second cavity 130 is greater than twice the length of the first cavity 120.

[0037] In the preparation stage of sampling, the pull ring 440 is pressed and pulled backward, so that the moving block 430 reaches the rear limiting groove 470, and in the process of backward movement of the pull ring 440, the sleeve 200 is driven to move backward by the moving block 430, the limiting spring 450 and the connecting ring 420. When the connecting ring 420 moves backward, the second push block 530 is driven to move backward, and after the second push block 530 moves backward by a preset distance, the rear end of the second push block 530 abuts against the front end of the first push block 520. In the process of continuous backward movement of the second push block 530, the first push block 520 is driven to move backward, and the trigger spring 510 is compressed to store energy. When the moving block 430 reaches the rear limiting groove 470, the moving block 430 is pushed outward by the limiting spring 450, the limiting protrusion 431 abuts against the limiting ring 460, and the moving block 430 cannot slide forward and backward, so the trigger spring 510 cannot release the elastic force.

[0038] When the needle core 300 and the sleeve 200 are pierced into the tumor tissue from the outer sheath needle of the coaxial needle to the appropriate depth, the pull ring 440 is pushed inward, the limiting protrusion 431 is disengaged from the abutment with the limiting ring 460, at this time, the trigger spring 510 releases the elastic force, the first push block 520 is pushed forward, the second push block 530 is pushed forward by the first push block 520, and the two are synchronized to slide forward in the first cavity 120, the first push block 520 drives the needle core 300 to move forward, and the second push block 530 drives the sleeve 200 to move forward. When the front end of the first push block 520 reaches the connecting position of the first cavity 120 and the second cavity 130, the first push block 520 is blocked by the main body 100, the first push block 520 stops moving forward, and the needle core 300 stops moving forward, at this time, the needle core 300 pierces into the preset puncture depth, the second push block 530 continues to move forward under the action of inertia, and the sleeve 200 is driven by the second push block 530 to move forward synchronously, when the moving block 430 moves into the limiting groove 470 in the front, the second push block 530 moves forward a distance greater than twice the distance that the first push block 520 moves forward, when the puncture is completed, the needle core 300 is located in the sleeve 200, and the tissue sample is located between the needle core 300 and the sleeve 200.

[0039] In a further embodiment, in the initial state, the rear end of the blocking spring 610 is higher than the sampling surface 311; the adjusting assembly 620 comprises an adjusting rod; the adjusting rod extends left and right and is fixedly connected in the sleeve 200, and the adjusting rod is lower than the rear end of the blocking spring 610.

[0040] After the needle core 300 pierces into the tumor tissue to the preset puncture depth, the sleeve 200 continues to move forward under the action of inertia, the adjusting rod passes under the tissue sample in the sampling groove 310, and as the sleeve 200 continues to move, the adjusting rod contacts the rear end surface of the blocking spring 610 and causes the blocking spring 610 to deform, the rear end of the blocking spring 610 is raised upward, the front end of the tissue sample is cut off, and the tissue sample is blocked between the needle core 300 and the sleeve 200.

[0041] Referring to Figure 7 , Figure 11 , Figure 13 , Figure 14 and Figure 15In one preferred embodiment of the present application, the blocking spring 610 is accommodated in the mounting groove 320 in the initial state, the adjusting assembly 620 comprises an adjusting wire 621 and an adjusting spring 622; the adjusting spring 622 extends forward and backward and is sleeved outside the sleeve 200, the rear end of the adjusting spring 622 is fixedly connected to the first push block 520; two accommodating grooves 210 are formed in the outer wall of the sleeve 200, the two accommodating grooves 210 are oppositely arranged and extend in the forward and backward direction, the height of the bottom of the accommodating groove 210 is higher than the height of the bottom of the mounting groove 320; the middle part of the adjusting wire 621 is located on the upper surface of the sampling groove 310, the two ends of the adjusting wire 621 pass through the accommodating grooves 210 and are fixedly connected to the front end of the adjusting spring 622; the adjusting spring 622 makes the adjusting wire 621 in the tensioned state.

[0042] After the needle core 300 pierces the tumor tissue to the preset puncture depth, the sleeve 200 continues to move forward under the action of inertia, the adjusting wire 621 moves forward from the sampling surface 311, in this process, the adjusting spring 622 is stretched to store energy, after the adjusting wire 621 enters the mounting groove 320, the adjusting spring 622 releases part of the elastic force, so that the adjusting wire 621 is in the tensioned state, in the projection of the vertical section, the adjusting wire 621 located on the front side of the needle core 300 changes from the state of being convex upward in the middle part as shown in Figure 7 to the state of being in the horizontal line type as shown in Figure 14 and continues to move forward, with the continuous movement of the sleeve 200, the adjusting wire 621 contacts the rear end surface of the blocking spring 610, so that the blocking spring 610 is deformed, the rear end of the blocking spring 610 is raised upward, in the process of the upward raising of the blocking spring 610, the front end of the tissue sample is cut off. Since the height of the bottom of the accommodating groove 210 is higher than the height of the bottom of the mounting groove 320, when the sleeve 200 moves forward, the height of the raising of the blocking spring 610 can be ensured, so that the blocking spring 610 abuts against the upper surface of the sleeve 200, thereby blocking the tissue sample between the needle core 300 and the sleeve 200.

[0043] Compared with the adjusting rod, in the adjusting rod, the upper surface of the rear end of the blocking spring 610 in the initial state is higher than the sampling surface 311 of the sampling groove 310, and the adjusting rod moves forward to make the blocking spring 610 elastically deformed, cut off the tissue and block the gap between the needle core 300 and the sleeve 200. The embodiment reduces the degree of pushing away the tumor tissue by the needle core 300 to a certain extent, but due to the upper surface of the rear end of the blocking spring 610 being higher than the sampling surface 311 of the sampling groove 310, the problem of insufficient amount of tissue samples in the sampling groove 310 still exists. In the embodiment of the adjusting wire 621 and the adjusting spring 622, because in the initial state, the blocking spring 610 is completely accommodated in the mounting groove 320, the tissue sample will not be pushed away in the process of entering the sampling groove 310, further solving the problem of insufficient sample amount caused by the tissue sample being blocked in the process of entering the sampling groove 310.

[0044] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tumor biopsy sampling device, characterized in that, The application relates to a needle core and sleeve structure of a biopsy device. The main body extends in the front-rear direction, and the inside of the main body is hollow; The sleeve extends in the front-rear direction, the rear end of the sleeve is slidingly installed on the main body, the front end of the sleeve extends out of the main body, and the end face of the front end of the sleeve is an inclined plane; The needle core extends in the front-rear direction, the rear end of the needle core is slidingly installed on the sleeve along the axis of the needle core, the front end of the needle core extends out of the sleeve by a preset distance, the end face of the front end of the needle core is an inclined plane, a sampling groove is formed in the front end of the needle core and extends in the front-rear direction, 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, 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, and when the limiting mechanism is in the unlocking state, the sleeve and the needle core slide in the front-rear direction under the action of external force; The exciting mechanism is used for sliding the needle core and the sleeve away from the main body in the front direction, and the sliding distance of the sleeve in the front direction is greater than the sliding distance of the needle core in the front direction; The blocking mechanism is configured to cut off the front end of the tissue in the sampling groove when the sleeve is away from the main body by a preset distance; The blocking mechanism blocks the gap between the needle core and the sleeve.

2. The device for puncture sampling of a tumor according to claim 1, wherein The blocking mechanism comprises a blocking spring and an adjusting assembly, the sampling groove comprises a horizontal plane, and the horizontal plane is a sampling surface; a mounting groove is formed in the front part of the sampling groove and extends in the front-rear direction, and the mounting groove is lower than the sampling surface; the front end of the blocking spring is fixedly connected to the mounting groove, the rear end face of the blocking spring is an inclined plane, and the lower side of the end face is located in front of the upper side; the adjusting assembly is used for lifting the rear end of the blocking spring upward to block the gap between the sleeve and the needle core when the sleeve moves forward relative to the needle core by a preset distance.

3. The device of claim 2, wherein the needle is configured to be inserted into a tumor. The limiting mechanism comprises a sliding groove, a connecting ring, a moving block, a pull ring, a limiting spring, two limiting rings and two limiting grooves; The sliding groove is formed in the main body and extends in a first direction; the limiting grooves extend in the radial direction of the main body, and the two limiting grooves are located at the two ends of the sliding groove and communicate with the sliding groove; the two limiting rings are fixedly installed in the two limiting grooves; the connecting ring is fixedly connected to the outer periphery of the sleeve and slidingly installed in the main body in the front-rear direction; the limiting spring extends in the radial direction of the sleeve, one end of the limiting spring is fixedly connected to the connecting ring, and the other end of the limiting spring is fixedly connected to the moving block; the moving block extends in the radial direction of the sleeve and slidingly installed in the sliding groove, and the end of the moving block away from the limiting spring extends out of the main body through the sliding groove and is fixedly connected to the pull ring; the moving block is fixedly connected to a limiting protrusion, and when the moving block moves outward in the radial direction of the sleeve by a preset distance in the limiting groove, the limiting protrusion abuts against the limiting ring; the limiting spring has a tendency to move the moving block away from the sleeve so that the limiting protrusion abuts against the limiting ring.

4. The device of claim 3, wherein the needle is configured to be inserted into a tumor. The limiting mechanism is provided with two limiting mechanisms, and the two limiting mechanisms are uniformly distributed in the circumferential direction of the sleeve.

5. The device of claim 4, wherein the needle is configured to be inserted into a tumor. The main body is hollow inside, and the rear end of the main body is fixedly connected with a rotating cap; the cavity inside the main body is divided into a first cavity and a second cavity, the first cavity is located at the rear end of the second cavity, the diameter of the first cavity is larger than that of the second cavity; the exciting mechanism comprises an exciting spring, a first push block and a second push block; the first push block is slidingly installed in the first cavity and is fixedly connected with the needle core; the diameter of the first push block is larger than that of the second push block; the second push block is slidingly installed in the first cavity and the second cavity; the second push block is fixedly connected with the connecting ring; the second push block is located at the front end of the first push block; the exciting spring is fixedly connected with the front end of the rotating cap and extends forward.

6. The device of claim 5, wherein the needle is configured to be inserted into a tumor. When the pull ring is located in the limiting groove close to the rotating cap, the sampling groove extends out of the sleeve; the length of the first cavity is greater than that of the sampling groove; the length of the second cavity is greater than twice the length of the first cavity.

7. The device of claim 6, wherein the needle is configured to be inserted into a tumor. In the initial state, the rear end of the blocking spring is higher than the sampling surface; the adjusting assembly comprises an adjusting rod; the adjusting rod extends left and right, is fixedly connected inside the sleeve, and is lower than the rear end of the blocking spring.

8. The device of claim 6, wherein the needle is configured to be inserted into a tumor. In the initial state, the blocking spring is accommodated in the mounting groove, and the adjusting assembly comprises an adjusting steel wire and an adjusting spring; the adjusting spring extends forward and backward, is sleeved outside the sleeve, and the rear end of the adjusting spring is fixedly connected with the first push block; two accommodating grooves are formed in the outer wall of the sleeve, the two accommodating grooves are oppositely arranged and extend in the front-rear direction, the height of the bottom of the accommodating groove is higher than that of the bottom of the mounting groove; the middle part of the adjusting steel wire is located on the upper surface of the sampling groove, and the two ends of the adjusting steel wire pass through the accommodating grooves and are fixedly connected with the front end of the adjusting spring; the adjusting spring makes the adjusting steel wire in a tensioned state.

9. The device of claim 8, wherein the needle is configured to be inserted into a tumor. The end faces of the front ends of the sleeve and the needle core are parallel.

10. The device of claim 9, wherein the needle is configured to be inserted into a tumor. Anti-skid protrusions are arranged on the outer peripheral wall of the main body.

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