Intrarenal puncture device

Abstract

The application provides a nephrology puncture device, which comprises a shell, a driving seat and a driving assembly. The shell comprises a driving cavity and a needle cavity in communication with the driving cavity. The driving seat is slidingly connected in the driving cavity and is provided with an electromagnetic ejection mechanism. The output end of the electromagnetic ejection mechanism extends into the needle cavity and is detachably connected with an inner needle. One side of the driving seat is provided with a first needle seat extending into the needle cavity. The first needle seat is detachably connected with an outer needle in sleeved connection with the inner needle. The driving assembly is arranged in the driving cavity and is connected with the driving seat at the output end, for driving the driving seat, and then driving the inner needle and the outer needle to extend out of or retract into the needle cavity. The electromagnetic ejection mechanism is used for driving the inner needle to extend out of the outer needle for puncture and to retract for resetting after puncture. The nephrology puncture device provided by the application can reduce the operation difficulty and deviation, reduce the puncture risk, improve the puncture position accuracy and the puncture success rate, and ensure the safety of the patient during the puncture process.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of medical puncture apparatus, and particularly relates to a nephrology puncture device. BACKGROUND

[0002] The main purpose of kidney puncture is to obtain a tissue sample of the kidney, and the sample is subjected to pathological examination to evaluate the lesion nature. The kidney puncture needs to puncture a puncture needle into the kidney through the skin under the guidance of B-ultrasound, and after reaching the target area, the inner and outer needles of the puncture needle cooperate to cut the tissue of the kidney and leave it in the needle cavity.

[0003] At present, common puncture devices include electromagnetic automatic launching type and spring semi-automatic launching type. When performing puncture operation, the puncture needle is first inserted into the subcutaneous target position by a handheld puncture device, and then a tissue is cut by triggering a launching switch. In order to improve the puncture position accuracy, a puncture frame is usually fixed on a B-ultrasound probe, and then the puncture needle passes through a guide sleeve on the puncture frame to ensure the puncture angle of the puncture needle accurate by using the pre-adjusted guide sleeve angle. Since the puncture needle is extremely long and slender, although the guide sleeve on the puncture frame can guide the puncture needle during the process of puncturing the puncture device into the subcutaneous tissue, the guide sleeve can only act on a small length of the puncture needle. During the whole process of puncturing downward, the operator needs to perform a stable pushing action with the limbs, which is very difficult to operate. If the action is slightly deformed, the puncture needle is easy to bend at the position of the guide sleeve. Once the puncture needle is bent, the inner and outer needles may be stuck or damaged, thereby causing puncture failure. In addition, the puncture needle bending will also cause the puncture angle to deviate, thereby causing the risk of piercing blood vessels or high-risk tissues and causing medical accidents.

[0004] Since the kidney is an important organ of the human body, the above-mentioned situations in the current puncture biopsy operation process are not conducive to puncture safety. Therefore, how to reduce the operation difficulty of kidney puncture and improve the puncture stability and success rate is a difficult problem to be solved in the industry. SUMMARY

[0005] The embodiment of the application provides a nephrology puncture device, which aims to reduce the operation difficulty and failure risk of kidney puncture and improve the puncture stability and success rate.

[0006] To achieve the above object, the technical scheme adopted by the present application is to provide a nephrology puncture device, comprising a shell, a driving seat and a driving assembly; the shell comprises a driving cavity and a needle cavity located on the side of the driving cavity and communicating with the driving cavity; the driving seat is slidingly connected in the driving cavity and is provided with an electromagnetic ejection mechanism, the output end of the electromagnetic ejection mechanism is provided with a first needle seat, the first needle seat is slidingly connected in the needle cavity and is detachably connected with an outer needle; one side of the driving seat is provided with a second needle seat, the second needle seat is slidingly connected in the needle cavity and is detachably connected with an inner needle, the inner needle is downwardly arranged in the inner part of the outer needle and is provided with a hook groove at the lower end; the driving assembly is arranged in the driving cavity, the output end is connected with the driving seat, for driving the driving seat, and then driving the inner needle and the outer needle to synchronously stretch and retract up and down; wherein the electromagnetic ejection mechanism is used for driving the outer needle to move upward to expose the hook groove, and after reaching the upper limit position, it is bounced back to reset to cut off the sample falling into the hook groove.

[0007] In a possible implementation manner, the electromagnetic ejection mechanism comprises:

[0008] A sliding seat is slidingly connected in the driving seat, one side of the sliding seat is provided with a first needle seat; the center of the sliding seat is provided with a cylindrical hole penetrating up and down, the inner peripheral wall of the cylindrical hole is sequentially distributed with a plurality of permanent magnetic rings along the axial direction, the magnetic pole directions of adjacent permanent magnetic rings are opposite;

[0009] An iron core is coaxially arranged in the cylindrical hole, the bottom end is fixedly connected with the driving seat and is provided with a positioning magnetic conducting sheet, a plurality of magnetic conducting sheets are spacedly distributed between the top end of the iron core and the positioning magnetic conducting sheet, coils are wound between the positioning magnetic conducting sheet and the lowermost magnetic conducting sheet and between each adjacent two magnetic conducting sheets, and the winding directions of adjacent coils are opposite;

[0010] Two groups of elastic members are respectively arranged between the upper and lower sides of the sliding seat and the driving seat;

[0011] Wherein, the positioning magnetic conducting sheet and the lowermost permanent magnetic ring are magnetically connected in the up-down direction, each magnetic conducting sheet is aligned with the combined area of two adjacent permanent magnetic rings; when the coil is energized, the magnetic pole obtained on the positioning magnetic conducting sheet is opposite to the magnetic pole direction of the lowermost permanent magnetic ring.

[0012] In some embodiments, each permanent magnetic ring is radially magnetized, the diameter of the positioning magnetic conducting sheet is smaller than the magnetic pole boundary line of the permanent magnetic ring; the edge of each magnetic conducting sheet is provided with a magnetic conducting ring, the two ends of the magnetic conducting ring are symmetrically extended to the upper and lower sides of the magnetic conducting sheet.

[0013] For example, the driving seat comprises:

[0014] A driving frame is arrayed with a plurality of slide rods penetrating through the sliding seat downward, and each slide rod is slidingly matched with the sliding seat, the driving frame is transmissionally connected with the output end of the driving assembly;

[0015] The first sliding plate is provided with a second needle seat on one side, and a ring-shaped magnet is embedded in the bottom wall of the first sliding plate, and the magnetic pole of the ring-shaped magnet is opposite to the magnetic pole distribution direction of the uppermost permanent magnet ring;

[0016] The second sliding plate is slidably connected to each sliding rod and located below the sliding seat, and the second sliding plate is fixed to the bottom end of the iron core, and the center of the second sliding plate is provided with a threaded sleeve;

[0017] The adjusting sleeve is rotationally connected to the center of the first sliding plate at the top end, and is screwedly connected to the threaded sleeve at the bottom end.

[0018] For example, the driving assembly comprises:

[0019] The operation head is arranged on the bottom wall of the shell and connected with the adjusting sleeve;

[0020] The fixed partition plate is arranged in the driving cavity and above the driving frame;

[0021] The driving rod is arranged in the adjusting sleeve and slidably connected with the adjusting sleeve, the driving rod passes through the driving frame and is screwedly connected with the driving frame, the top end of the driving rod is rotationally connected with the fixed partition plate, and the bottom end of the driving rod is rotationally connected with the operation head;

[0022] The motor is fixedly connected in the driving cavity and above the fixed partition plate, and the output end of the motor faces downward and is provided with a central gear;

[0023] The inner ring gear is fixedly connected to the top wall of the fixed partition plate and coaxial with the central gear;

[0024] The planet carrier is fixedly sleeved on the top end of the driving rod, a plurality of planet gears are uniformly distributed on the planet carrier in a circumferential direction and centered on the driving rod, and the planet gears are all meshingly connected with the inner ring gear and the central gear.

[0025] In a possible implementation, a telescopic sleeve is sleeved on the driving rod, the bottom end of the telescopic sleeve is connected with the operation head, and the top end of the telescopic sleeve is connected with the adjusting sleeve; the telescopic sleeve comprises a plurality of sleeve segments which are sequentially nested and connected, and the sleeve segments adjacent to each other are connected through sliding keys extending in the axial direction of the driving rod;

[0026] The top end of the operation head extends into the driving cavity and is provided with a connecting blind hole rotationally connected with the bottom end of the driving rod, a disc spring is arranged in the connecting blind hole, and the disc spring abuts against the bottom end of the driving rod;

[0027] The bottom wall of the shell is provided with a through hole suitable for rotationally connecting the operation head, the inner wall of the through hole has a spline groove extending in the axial direction thereof, the peripheral wall of the operation head is provided with a spline segment slidably connected with the spline groove, and the top end of the operation head is further provided with a positioning snap ring with a diameter larger than the inner diameter of the through hole;

[0028] The positioning ring abuts against the inner bottom wall of the drive cavity under the elastic pushing action of the disc spring on the operating head, and the spline segment is embedded in the spline groove. When the operating head is pressed upward until the positioning ring separates from the inner bottom wall of the drive cavity, the spline segment slides out of the spline groove.

[0029] In some embodiments, slides are provided on two opposite inner sidewalls of the needle cavity, and the first needle seat and the second needle seat are slidably connected to the slides; the sidewall of the housing is provided with a needle loading slot communicating with the needle cavity; a movable cover plate is slidably connected to the outer wall of the housing, and the movable cover plate has a closed state that slides to cover the needle loading slot, and also has an open state that slides to expose the needle loading slot.

[0030] The needle cavity has a guide block at the bottom, and the guide block has a guide hole that matches the diameter of the outer needle; the first needle seat has a first slot suitable for mounting the outer needle, the first needle seat has a first clearance groove facing the needle loading groove, and the second needle seat has a second slot suitable for mounting the inner needle.

[0031] For example, the bottom wall of the guide block has a threaded hole at its center, which is used to screw a fixed connector into the threaded hole. The connector is suitable for fitting and supporting on the skin and the support angle is adjustable. The top wall of the guide block has a core cavity. The side of the guide block facing the needle slot has a second clearance groove that communicates with the core cavity. Multiple rotating cores are rotatably connected in the core cavity. Each rotating core has a U-shaped groove that extends from its center to its edge. Each rotating core can be rotated sequentially to a needle-loading state where each U-shaped groove is aligned with the second clearance groove, and also to a needle-guided state where each U-shaped groove is rotated sequentially to a guide-needle state where each U-shaped groove is staggered with the second clearance groove. In the needle-guided state, the semi-circular wall surface of each U-shaped groove at the center of the rotating core together forms a needle-guided hole.

[0032] For example, each rotating core is sequentially named from the inside of the core cavity to the opening: first rotating core, second rotating core, and third rotating core. The opening of the core cavity is provided with a cover plate, and the cover plate is provided with a third clearance groove that is aligned with the second clearance groove.

[0033] The bottom of the core cavity is provided with a first limiting arc groove, and the side wall of the first rotating core facing the bottom of the core cavity is provided with a first limiting post, which extends into the first limiting arc groove; the side wall of the first rotating core away from the bottom of the core cavity is provided with a second limiting arc groove, and the side wall of the second rotating core facing the first rotating core is provided with a second limiting post, which extends into the second limiting arc groove; the side wall of the second rotating core away from the first rotating core is provided with a third limiting arc groove, and the side wall of the third rotating core facing the second rotating core is provided with a third limiting post, which extends into the third limiting arc groove; the side wall of the third rotating core away from the second rotating core is provided with an operating handle, which passes through the cover plate and extends out of the core cavity;

[0034] Wherein, in the needle loading state, each limiting column abuts with one end of the corresponding limiting arc groove in the same circumferential direction, and in the needle guiding state, each limiting column abuts with the other end of the corresponding limiting arc groove in the circumferential direction.

[0035] In some embodiments, a battery and a control circuit board are arranged in the driving cavity, the control circuit board is electrically connected with the electromagnetic ejection mechanism and the driving assembly respectively, two circuit switches electrically connected with the control circuit board are arranged on the side wall of the shell, one of the circuit switches is used for controlling the electromagnetic ejection mechanism, and the other circuit switch is used for controlling the driving assembly.

[0036] The kidney puncture device has the advantages that, compared with the prior art, the kidney puncture device is provided with a needle cavity on the side of the shell, the inner needle and the outer needle can be retracted in the needle cavity in the initial state, the shell is positioned by the puncture frame and the puncture angle is adjusted, then the driving assembly is started to drive the driving seat and then drive the inner needle and the outer needle to synchronously penetrate into the subcutaneous tissue, the electromagnetic ejection mechanism is triggered to drive the outer needle to reversely pop out to expose the hook groove after the needle tip reaches the target area detected by the B-ultrasonic probe, meanwhile, the sample tissue falls into the hook groove and is cut off and left in the hook groove in the process of the outer needle returning to the original position, then the driving assembly drives the driving seat to reversely move, and then drives the inner needle and the outer needle to exit the subcutaneous tissue and retract into the needle cavity, the operator only needs to hold the shell to keep stable under the support of the puncture frame, and does not need to swing the limbs to perform the insertion and extraction actions, the inner needle and the outer needle can always keep the predetermined puncture angle, the phenomenon of jamming or damage caused by the bending of the inner needle and the outer needle is avoided, the physical consumption of the operator in the puncture process is small, the penetration process of the inner needle and the outer needle is stable, the puncture operation difficulty and deviation are reduced, the risk of puncturing important blood vessels or surrounding high-risk tissues due to the instability of the puncture needle is reduced, the puncture position accuracy and the puncture success rate are improved, and the safety of the patient in the puncture process is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 A perspective structural schematic view of the kidney puncture device (the shell is cut open) provided by the embodiment of the present application is shown in the figure;

[0038] Figure 2 A perspective structural schematic view of the outer needle ejection state adopted by the embodiment of the present application is shown in the figure;

[0039] Figure 3 A sectional structural schematic view of the kidney puncture device provided by the embodiment of the present application when the inner needle and the outer needle are located in the needle cavity is shown in the figure;

[0040] Figure 4 A sectional structural schematic view of the kidney puncture device provided by the embodiment of the present application when the inner needle and the outer needle are extended out of the needle cavity is shown in the figure;

[0041] Figure 5 The schematic diagram of the magnetic pole distribution of the electromagnetic ejection mechanism coil in the embodiment of the present application when energized;

[0042] Figure 6 The schematic diagram of the enlarged structure at A in the embodiment of the present application; Figure 4 The schematic diagram of the enlarged structure at A in the embodiment of the present application;

[0043] Figure 7 The schematic diagram of the connection structure of the operating head and the shell in the embodiment of the present application;

[0044] Figure 8 The schematic diagram of the matching structure of two sleeve joints of the telescopic sleeve in the embodiment of the present application;

[0045] Figure 9 The schematic diagram of the structure of the first needle seat, the second needle seat and the guide block in the embodiment of the present application;

[0046] Figure 10 The schematic diagram of the exploded structure of the guide block in the embodiment of the present application in two different visual angles.

[0047] In the figure: 10, housing; 11, driving cavity; 12, needle cavity; 121, slide; 122, needle loading notch; 13, movable cover plate; 14, guide block; 141, threaded hole; 142, core cavity; 1421, first limiting arc groove; 143, second avoiding groove; 15, rotating core; 150, U-shaped groove; 151, first rotating core; 1511, first limiting column; 1512, second limiting arc groove; 152, second rotating core; 1521, second limiting column; 1522, third limiting arc groove; 153, third rotating core; 1531, third limiting column; 1532, operating handle; 154, cover plate; 1541, third avoiding groove; 16, spline groove; 20, driving seat; 200, second needle seat; 201, second clamping groove; 21, driving frame; 211, slide rod; 22, first slide plate; 221, ring-shaped magnet; 23, second slide plate; 231, screw sleeve; 24, adjusting sleeve; 30, electromagnetic ejection mechanism; 300, first needle seat; 301, first clamping groove; 302, first avoiding; 31, slide seat; 311, permanent magnet ring; 32, iron core; 321, positioning magnetic guide sheet; 322, magnetic guide disc; 3221, magnetic guide ring; 33, coil; 34, elastic member; 40, outer needle; 41, coating mark; 50, inner needle; 51, hook groove; 60, driving assembly; 61, operating head; 611, spline section; 612, positioning clamping ring; 613, connecting blind hole; 62, fixed partition plate; 63, driving rod; 64, motor; 641, central gear; 65, inner gear ring; 66, planet carrier; 661, planet gear; 67, telescopic sleeve; 671, sleeve joint; 6711, slide key; 68, disc spring; 70, battery; 80, control circuit board; 81, circuit switch; 82, charging socket; 90, connecting head; 91, connecting part; 92, supporting part; 921, taper hole; 93, adhesive sticker. DETAILED DESCRIPTION

[0048] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clearly, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0049] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or several of the features. In the description of the present application, the meaning of "a plurality of", "several" is two or more, unless otherwise explicitly specified.

[0050] Please refer to Figures 1 to 6 , now the renal puncture device provided by the present application will be described. The renal puncture device comprises a shell 10, a driving seat 20 and a driving assembly 60; the shell 10 comprises a driving cavity 11 and a needle cavity 12 located on the side of the driving cavity 11 and communicating with the driving cavity 11; the driving seat 20 is slidingly connected in the driving cavity 11 and is provided with an electromagnetic ejection mechanism 30, the output end of the electromagnetic ejection mechanism 30 is provided with a first needle seat 300, the first needle seat 300 is slidingly connected in the needle cavity 12 and is detachably connected with an outer needle 40; one side of the driving seat 20 is provided with a second needle seat 200, the second needle seat 200 is slidingly connected in the needle cavity 12 and is detachably connected with an inner needle 50, the inner needle 50 is downwardly provided in the inner part of the outer needle 40 and is provided with a hook groove 51 at the lower end; the driving assembly 60 is provided in the driving cavity 11, the output end is connected with the driving seat 20, for driving the driving seat 20, and then driving the inner needle 50 and the outer needle 40 to synchronously stretch and retract up and down; wherein the electromagnetic ejection mechanism 30 is used for driving the outer needle 40 to move upward to expose the hook groove 51, and after reaching the upper limit position, it is bounced back to cut off the sample falling into the hook groove 51.

[0051] It should be noted that when the puncture is performed, the inner needle 50 and the outer needle 40 are simultaneously punctured by the driving assembly 60 before the puncture into the subcutaneous and kidney tissue, at this time, the needle tip of the inner needle 50 and the needle tip of the outer needle 40 are flush or the needle tip of the inner needle 50 protrudes from the needle tip of the outer needle 40 by a small amount such as 2 mm, which can ensure that the needle tips of the inner needle 50 and the outer needle 40 form a closed conical tip, and the needle tip of the outer needle 40 and / or the tip of the inner needle 50 exposed from the outer needle 40 can be provided with a coating mark 41 for B-ultrasound observation and development to accurately grasp the position of the inner needle 50 and the outer needle 40, when the needle tip reaches the target position, the driving assembly 60 stops working, and then the electromagnetic ejection mechanism 30 is started, so that the outer needle 40 is ejected in reverse to expose the hook groove 51 at the front end of the inner needle 50, and the sample tissue falls into the hook groove 51, and the outer needle 40 returns to the original position after reaching the limit position, during which the tip of the outer needle 40 cuts the sample tissue, it should be understood that the electromagnetic ejection mechanism 30 not only can eject the outer needle 40 in reverse, but also can automatically return to the original position after the outer needle 40 is ejected to the limit position to complete a cutting action, the specific principle can be that the electromagnetic ejection mechanism 30 is ejected by electromagnetic repulsion and returned by elastic element, fully utilizes the rapidity of electromagnetic ejection to ensure the success rate of cutting the sample tissue by the tip of the outer needle 40, and further improves the success rate of puncture.

[0052] It should be understood that during the entire puncture process, the shell 10 only needs to be stably supported on the puncture frame, and then the driving assembly 60 drives the driving seat 20 to realize the puncture process to the target position in the subcutaneous tissue, and then the electromagnetic ejection mechanism 30 drives the outer needle 40 to cut the tissue falling into the hook groove 51 of the inner needle 50, and the operator does not need to perform the insertion or extraction action of the puncture needle by the body movement, so that the puncture stability can be ensured, and the bending of the inner needle 50 and the outer needle 40 is avoided to affect the smoothness and success rate of the puncture.

[0053] Further, the lower end of the needle cavity 12 is provided with a through hole matched with the outer needle 40, which ensures that the inner needle 50 and the outer needle 40 can maintain straight puncture during the entire process of being punctured into the subcutaneous tissue by the driving assembly 60, and avoids the bending of the part between the root of the inner needle 50 and the outer needle 40 and the puncture into the subcutaneous tissue.

[0054] Compared with the prior art, the renal department puncture device provided by the embodiment is provided with a needle cavity 12 on the side of the shell 10, and the inner needle 50 and the outer needle 40 can be retracted in the needle cavity 12 in the initial state. When puncturing, the shell 10 is positioned and the puncture angle is adjusted through the puncture frame, and then the driving assembly 60 is started to drive the driving seat 20 and then drive the inner needle 50 and the outer needle 40 to synchronously puncture subcutaneously. After the needle tip reaches the target area detected by the B-ultrasound probe, the electromagnetic ejection mechanism 30 is triggered to drive the outer needle 40 to reversely pop out to expose the hook groove 51, and the sample tissue falls into the hook groove 51 and is cut off and left in the hook groove 51 in the process of the outer needle 40 returning to the original position. Then the driving assembly 60 drives the driving seat 20 to reversely move, and then drives the inner needle 50 and the outer needle 40 to exit the subcutaneous tissue and retract into the needle cavity 12. In the whole puncture process, the operator only needs to hold the shell 10 to keep stable under the support of the puncture frame, without the need to swing the limbs to insert and pull out. Not only can the puncture angle of the inner needle 50 and the outer needle 40 be kept unchanged to avoid the buckling or damage of the inner needle 50 and the outer needle 40, but also the physical consumption of the operator in the puncture process is small, and the insertion process of the inner needle 50 and the outer needle 40 is stable, so as to reduce the puncture operation difficulty and deviation, and then reduce the risk of puncturing important blood vessels or surrounding high-risk tissues due to the instability of the puncture needle, improve the puncture position accuracy and puncture success rate, and ensure the safety of the patient in the puncture process.

[0055] In some embodiments, referring to Figures 3 to 5 , the electromagnetic ejection mechanism 30 comprises a sliding seat 31, a core 32 and two groups of elastic members 34; the sliding seat 31 is connected to the driving seat 20 in a sliding manner up and down, and a first needle seat 300 is arranged on one side of the sliding seat 31; the center of the sliding seat 31 is provided with a cylindrical hole penetrating up and down, and a plurality of permanent magnetic rings 311 are arranged on the inner circumferential wall of the cylindrical hole in sequence along the axial direction, and the magnetic pole directions of adjacent permanent magnetic rings 311 are opposite; the core 32 is coaxially arranged in the cylindrical hole, the bottom end is fixedly connected with the driving seat 20 and is provided with a positioning magnetic guide sheet 321, a plurality of magnetic guide discs 322 are arranged in the core 32 in a spaced manner between the top end and the positioning magnetic guide sheet 321, coils 33 are wound between the positioning magnetic guide sheet 321 and the lowermost magnetic guide disc 322 and between each two adjacent magnetic guide discs 322, and the winding directions of adjacent coils 33 are opposite; the two groups of elastic members 34 are arranged between the upper and lower sides of the sliding seat 31 and the driving seat 20 respectively;

[0056] The positioning magnetic guide sheet 321 is magnetically connected with the lowermost permanent magnetic ring 311 in the up-down direction, and each magnetic guide disc 322 is aligned with the combined area of two adjacent permanent magnetic rings 311; when the coil 33 is electrified, the magnetic pole obtained on the positioning magnetic guide sheet 321 is opposite to the magnetic pole direction of the lowermost permanent magnetic ring 311.

[0057] After the inner needle 50 and outer needle 40 are simultaneously inserted into the target position, the coil 33 is energized to generate a magnetic field. Here, the magnetic conductivity of the iron core 32 is utilized to converge the magnetic poles on each magnetically conductive disc 322. Since the winding directions of adjacent coils 33 are opposite, magnetic poles are formed on each magnetically conductive disc 322 and the magnetically positioned disc. Figure 5 The magnetic pole distribution shown is S, N, S, N, S from top to bottom. The bottommost N pole is the magnetic pole obtained from the positioning magnetic guide plate 321. Based on this, the inner magnetic poles of each permanent magnet ring 311 distributed from top to bottom are arranged as N, S, N, S. The positioning magnetic guide plate 321 generates an upward repulsive force on the bottommost permanent magnet pole, while the bottommost magnetic guide disc 322 generates an upward attractive force on the bottommost permanent magnet pole. In this way, each permanent magnet ring 311 is subjected to the upward repulsive or attractive force provided by the corresponding magnetic guide disc 322. Since the permanent magnet ring 311 is fixedly connected to the inner wall of the cylindrical hole, the slide 31 moves upward under the combined action of the upward magnetic repulsive force and magnetic attraction force, thereby driving the outer needle 40 to move upward and expose the hook groove 51.

[0058] During the upward movement of the slide block 31, the upper elastic element 34 gradually compresses and the lower elastic element 34 gradually stretches, thereby generating a downward pushing resistance on the slide block 31. When the pushing resistance exceeds the magnetic force, the upward speed of the slide block 31 gradually decreases until it stops and reaches its limit position. At this point, the pushing resistance reaches its maximum, and then the coil 33 is de-energized (specifically, this could be achieved by operating the energizing switch of the coil 33 once, energizing the coil 33 once for 0.1 seconds, or by other similar control and energizing methods in existing technologies), and the magnetic field disappears. As the magnetic poles on each magnetic disc 322 and the magnetic positioning plate disappear, the slide 31 begins to descend and reset under the pushing of the elastic element 34 above and the pulling of the elastic element 34 below. As the permanent magnet ring 311 gradually approaches the magnetic positioning plate, the lowest permanent magnet ring 311 begins to attract the magnetic positioning plate, thereby accelerating the descent speed of the slide 31 until the lowest permanent magnet ring 311 is completely in contact with the magnetic positioning plate. During this process, the tip of the outer needle 40 cooperates with the inner needle 50 to cut off the sample tissue that has fallen into the hook groove 51.

[0059] It should be understood that during the operation of the electromagnetic ejection mechanism 30 described above, the process of the slide 31 being upwardly ejected by the energized coil 33 against the outer needle 40 experiences a gradually decreasing electromagnetic ejection force (including upward magnetic repulsion and magnetic attraction) and a gradually increasing elastic force, and during this process, the slide 31 has a slow deceleration time before reaching the upper limit position, which can give the sample tissue sufficient time to fall into the exposed hook groove 51, and then when the coil 33 is de-energized and the electromagnetic force disappears, the elastic force of the two sets of elastic members 34 is released, and the slide 31 starts to accelerate downward. During the downward process, the distance between the permanent magnet ring 311 and the magnetic guiding positioning sheet becomes closer and closer, so the adsorption force of the permanent magnet ring 311 to the magnetic guiding positioning sheet (magnetic attraction principle of permanent magnet to magnetic conductor) becomes stronger and stronger, and thus the downward speed becomes faster and faster, until the lowermost permanent magnet ring 311 and the magnetic guiding positioning sheet are in abutment and are adsorbed together, thereby avoiding the deceleration process of the outer needle 40 in the conventional electromagnetic puncture and ejection cutting process, and the downward cutting speed of the outer needle 40 can be improved, which is more helpful to smoothly cut the sample tissue falling into the hook groove 51 and improve the success rate of puncture biopsy.

[0060] It should be noted that in the present embodiment, as shown in Figure 5 each permanent magnet ring 311 is radially magnetized, and the diameter of the positioning magnetic sheet 321 is smaller than the magnetic pole boundary line of the permanent magnet ring 311; the edge of each magnetic guiding disc 322 is provided with a magnetic guiding ring 3221, and the two ends of the magnetic guiding ring 3221 symmetrically extend to the upper and lower sides of the magnetic guiding disc 322.

[0061] The radial magnetization of the permanent magnet ring 311 can ensure uniform distribution of the magnetic poles on the inner ring surface, thereby ensuring that each permanent magnet ring 311 can maintain stable vertical magnetic repulsion and magnetic attraction with each magnetic guiding disc 322. On this basis, the magnetic poles are uniformly distributed on the permanent magnet ring 311 and each magnetic guiding disc 322, so that the radial magnetic force between them can be completely cancelled out, thereby generating only an axial force between the permanent magnet ring 311 and the magnetic guiding disc 322, avoiding the shaking of the outer needle 40 caused by the radial force borne by the slide 31, thereby improving the puncture accuracy and safety; on this basis, by providing the magnetic guiding ring 3221 on the edge of the magnetic guiding disc 322, uniform magnetic pole distribution can be obtained on the entire magnetic guiding ring 3221, thereby increasing the magnetic force acting distance between each magnetic guiding disc 322 and the corresponding permanent magnet ring 311 in the vertical direction, and further improving the ejection stroke of the outer needle 40.

[0062] As a specific embodiment of the drive seat 20 described above, please refer to Figures 1 to 4The driving seat 20 comprises a driving frame 21, a first sliding plate 22, a second sliding plate 23 and an adjusting sleeve 24. A plurality of sliding rods 211 are arranged on the driving frame 21 and pass through the sliding seat 31 downward, and each sliding rod 211 is in sliding fit with the sliding seat 31. The driving frame 21 is in transmission connection with the output end of the driving assembly 60. The first sliding plate 22 is located between the driving frame 21 and the sliding seat 31 and is fixedly connected with each sliding rod 211. The first sliding plate 22 is provided with a second needle seat 200 on one side. An annular magnet 221 is embedded in the bottom wall of the first sliding plate 22. The magnetic pole of the annular magnet 221 is opposite to the magnetic pole distribution direction of the uppermost permanent magnet ring 311. The second sliding plate 23 is in up-down sliding connection with each sliding rod 211 and is located below the sliding seat 31. The second sliding plate 23 is fixed with the bottom end of the iron core 32, and the center of the second sliding plate 23 is provided with a threaded sleeve 231. The top end of the adjusting sleeve 24 is in rotary connection with the center of the first sliding plate 22, and the bottom end is in screw joint with the threaded sleeve 231.

[0063] When the puncture is performed, the driving assembly 60 drives the driving frame 21 to move downward. The first sliding plate 22 connected with the driving frame 21 through each sliding rod 211 moves downward, so that the inner needle 50 arranged on the second needle seat 200 is stabbed downward. At the same time, the second sliding plate 23 connected with the first sliding plate 22 through the adjusting sleeve 24 moves downward synchronously, so that the iron core 32 connected with the second sliding plate 23 moves downward synchronously. Since the permanent magnet ring 311 in the cylindrical hole is adsorbed and fixed with the magnetic guiding positioning sheet, the sliding seat 31 moves downward synchronously with the iron core 32, so that the outer needle 40 arranged on the first needle seat 300 is stabbed synchronously with the inner needle 50. Similarly, when the driving assembly 60 drives the driving frame 21 to move upward, the inner needle 50 and the outer needle 40 can be extracted synchronously through the above connection relationship.

[0064] When the length of the obtained sample tissue needs to be adjusted for the puncture site, the elastic limit distance of the outer needle 40 relative to the inner needle 50 can be adjusted. Specifically, since the top end of the adjusting sleeve 24 is in rotary connection with the first sliding plate 22, and the bottom end is in screw joint with the second sliding plate 23, the distance between the first sliding plate 22 and the second sliding plate 23 can be adjusted by rotating the adjusting sleeve 24, so that the stroke of the sliding seat 31 located between the first sliding plate 22 and the second sliding plate 23 is adjusted, thereby adjusting the elastic stroke of the outer needle 40. Especially in the case that the puncture target area has high-risk tissues or blood vessels around, the length of the sample can be reduced by shortening the elastic stroke of the outer needle 40, so as to avoid touching and damaging the surrounding high-risk tissues or blood vessels, thereby improving the safety of the puncture process.

[0065] Since the bottom wall of the first sliding plate 22 is provided with the annular magnet 221 opposite to the magnetic pole of the uppermost permanent magnet ring 311, the annular magnet 221 has a downward repulsion force to the uppermost permanent magnet ring 311. When the slide 31 is raised to the limit position and the coil 33 is powered off, the slide 31 not only bears the downward elastic force of the two sets of elastic members 34, but also bears the downward repulsion force of the annular magnet 221 to the permanent magnet ring 311, so as to improve the speed of the reverse positioning of the slide 31 downward, improve the cutting speed of the front end of the outer needle 40 to the test material tissue falling into the hook groove 51, and further reduce the trauma and puncture risk of the puncture position.

[0066] As a specific embodiment of the above-mentioned driving assembly 60, please refer to Figures 1 to 4 , the driving assembly 60 comprises an operating head 61, a fixed partition plate 62, a driving rod 63, a motor 64, an inner ring gear 65, and a planet carrier 66; wherein the operating head 61 is arranged on the bottom wall of the shell 10 and connected with the adjusting sleeve 24; the fixed partition plate 62 is arranged in the driving cavity 11 and above the driving frame 21; the driving rod 63 is arranged in the adjusting sleeve 24 and slidably connected with the adjusting sleeve 24, the driving rod 63 passes through the driving frame 21 and is screw-connected with the driving frame 21, the top end of the driving rod 63 is rotationally connected with the fixed partition plate 62, and the bottom end is rotationally connected with the operating head 61; the motor 64 is fixedly connected in the driving cavity 11 and above the fixed partition plate 62, the output end of the motor 64 is downward and provided with a central gear 641; the inner ring gear 65 is fixedly connected on the top wall of the fixed partition plate 62 and coaxial with the central gear 641; the planet carrier 66 is fixedly sleeved on the top end of the driving rod 63, a plurality of planet gears 661 are uniformly distributed on the planet carrier 66 with the driving rod 63 as the center, and the planet gears 661 are meshingly connected with the inner ring gear 65 and the central gear 641.

[0067] When the motor 64 rotates forward, each planet gear is driven to rotate by the central gear 641, the planet carrier 66 is driven to rotate by each planet gear, thereby driving the driving rod 63 to rotate, the driving frame 21 is driven to move downward by the screw connection between the driving rod 63 and the driving frame 21, and then the inner needle 50 and the outer needle 40 are synchronously driven to move downward and puncture, when the motor 64 reverses, the driving rod 63 reversely rotates to drive the driving frame 21 to move upward, thereby synchronously driving the inner needle 50 and the outer needle 40 to move out, the driving mode is stable and reliable, a large transmission ratio can be realized in a very small space, and the puncture action accuracy and the stability of the state after puncturing the target position are ensured.

[0068] Specifically, in the embodiment, referring to Figures 3 to 8 , the driving rod 63 is sleeved with a telescopic sleeve 67, the bottom end of the telescopic sleeve 67 is connected with the operating head 61, and the top end is connected with the adjusting sleeve 24; the telescopic sleeve 67 comprises a plurality of sleeve segments 671 which are connected in sequence, and the inner and outer adjacent sleeve segments 671 are connected through the sliding keys 6711 extending along the axial direction of the driving rod 63.

[0069] The telescopic sleeve 67 is sleeved on the driving rod 63 to achieve the transmission connection between the adjusting sleeve 24 and the operating head 61, and meanwhile, the telescopic sleeve 67 has the telescopic function and the torque transmission function by virtue of the mutual nesting of the sleeve segments 671 and the cooperation of the sliding keys 6711, so that the ejection stroke of the outer needle 40 can be adjusted by rotating the operating head 61 when the driving seat 20 stays at any position of the driving cavity 11, thereby improving the use flexibility.

[0070] The top end of the operating head 61 extends into the driving cavity 11 and is provided with a connecting blind hole 613 at the center, which is rotationally matched with the bottom end of the driving rod 63. A disc spring 68 is arranged in the connecting blind hole 613 and abuts against the bottom end of the driving rod 63. The bottom wall of the shell 10 is provided with a through hole which is suitable for rotationally matching the operating head 61. The inner wall of the through hole has a spline groove 16 extending along the axial direction. The peripheral wall of the operating head 61 is provided with a spline segment 611 which is slidingly matched with the spline groove 16. The top end of the operating head 61 is further provided with a positioning snap ring 612 which has a larger diameter than the inner diameter of the through hole. The positioning snap ring 612 abuts against the inner bottom wall of the driving cavity 11 under the elastic pushing action of the disc spring 68. The spline segment 611 is correspondingly embedded in the spline groove 16. When the operating head 61 is pressed upwardly to separate the positioning snap ring 612 from the inner bottom wall of the driving cavity 11, the spline segment 611 slides out of the spline groove 16.

[0071] The operating head 61 is arranged at the bottom of the shell 10 to avoid accidental touch during the operation. Under the normal circumstances, the operating head 61 can keep the spline groove 16 and the spline segment 611 in the embedded state under the elastic pushing action of the disc spring 68, so that the ejection stroke change caused by the synchronous rotation of the operating head 61 with the driving rod 63 during the rotation of the driving rod 63 can be avoided. When it is necessary to adjust the ejection stroke of the outer needle 40, the spline segment 611 is separated from the spline groove 16 by pressing the operating head 61 upwardly, so that the operating head 61 can be rotated to drive the adjusting sleeve 24 to rotate through the telescopic sleeve 67, thereby moving the second sliding plate 23 upwardly or downwardly. This not only facilitates the adjustment of the ejection stroke of the outer needle 40, but also ensures the stability of the puncture operation.

[0072] In some embodiments, referring to Figure 3 , Figure 4 and Figure 9 , the two opposite inner side walls of the needle cavity 12 are provided with sliding channels 121, and the first needle seat 300 and the second needle seat 200 are slidingly connected to the sliding channels 121. The side wall of the shell 10 is provided with a needle loading slot 122 which is communicated with the needle cavity 12. The outer wall of the shell 10 is slidingly connected with a movable cover plate 13. The movable cover plate 13 has a closed state in which it is slid to cover the needle loading slot 122, and also has an open state in which it is slid to expose the needle loading slot 122.

[0073] The first needle seat 300 and the second needle seat 200 are exposed through the needle installation slot 122 by opening the movable cover plate 13, so that the inner needle 50 and the outer needle 40 are conveniently disassembled and assembled, and the movable cover plate 13 is closed after assembly, so that the inner needle 50 and the outer needle 40 are not exposed.

[0074] The bottom end of the needle cavity 12 is provided with a guide block 14, the guide block 14 is provided with a needle guide hole matched with the diameter of the outer needle 40; the first needle seat 300 is provided with a first clamping groove 301 suitable for clamping the outer needle 40, and the first needle seat 300 is provided with a first avoiding groove 302 towards the needle installation slot 122, and the second needle seat 200 is provided with a second clamping groove 201 suitable for clamping the inner needle 50.

[0075] The tail of the inner needle 50 and the outer needle 40 is a clamping head, and since the tail of the inner needle 50 protrudes above the tail of the outer needle 40, the first avoiding groove 302 is arranged on the first needle seat 300, so that the inner needle 50 can directly pass through the first avoiding groove 302, and the inner needle 50 is inserted into the outer needle 40 first during installation, and then the clamping head of the inner needle 50 is clamped into the second clamping groove 201 and the clamping head of the outer needle 40 is clamped into the first clamping groove 301, so that the operation is convenient and fast.

[0076] On this basis, the guide block 14 is arranged at the bottom end of the needle cavity 12, and the needle guide hole is used to constrain the part of the outer needle 40 protruding out of the needle cavity 12, compared with the conventional puncture needle which is simply supported by a single-point structure at the root during use, the needle guide hole is used to assist in supporting the middle segment of the outer needle 40, so that the overall rigidity of the outer needle 40 (and the inner needle 50 inserted therein) can be improved, and bending during puncture is avoided, so that the puncture accuracy and the puncture action smoothness are affected.

[0077] It should be understood that, in the embodiment, referring to Figure 6 and Figure 10 , a threaded hole 141 is arranged at the center of the bottom wall of the guide block 14, a connecting head 90 is screwed into the threaded hole 141, the connecting head 90 is suitable for being attached and supported on the skin and the supporting angle is adjustable; a core cavity 142 is arranged on the top wall of the guide block 14, a second avoiding groove 143 is arranged on the side of the guide block 14 towards the needle installation slot 122 and communicates with the core cavity 142, and a plurality of rotating cores 15 are rotatably connected in the core cavity 142; each rotating core 15 has a U-shaped groove 150 arranged from the center to the edge, each rotating core 15 has a needle installation state in which each U-shaped groove 150 is sequentially rotated to be aligned with the second avoiding groove 143, and has a needle guide state in which each U-shaped groove 150 is sequentially rotated to be staggered with the second avoiding groove 143; in the needle guide state, the semicircular wall surfaces of each U-shaped groove 150 at the center of the rotating core 15 together form a needle guide hole.

[0078] Generally, the puncture needle root of the puncture device is inserted into the guide sleeve of the puncture support, and the puncture support is fixed on the probe of the B-ultrasound. This mode has a greater impact on the operation of the B-ultrasound probe, and there is also a certain distance between the guide sleeve and the skin, thereby affecting the accuracy of the judgment of the puncture angle. In addition, the positioning of the guide sleeve is also needed to control the puncture depth during the puncture process. In the initial stage of puncture (when the needle has not been inserted into the body), the operator needs to insert the puncture needle into the guide sleeve and deliver the puncture needle downward under the guidance of the guide sleeve. In this process, the operator holding the puncture device is extremely easy to deform the action and cause the puncture needle to bend. In the present embodiment, the connecting head 90 is directly pressed against the skin at the puncture position of the patient. When the inner needle 50 and the outer needle 40 are not extended out of the needle cavity 12, the connecting head 90 can be directly pressed against the target position. Then, after adjusting the angle, the driving assembly 60 drives the driving seat 20 to move downward, so that the inner needle 50 and the outer needle 40 are synchronously extended and inserted into the body. This not only simplifies the operation and saves labor, but also can avoid the bending of the inner needle 50 and the outer needle 40, thereby improving the puncture accuracy.

[0079] Specifically, the connecting head 90 includes a connecting part 91 matched with the threaded hole 141, and a supporting part 92 connected with the bottom of the connecting part 91 by a ball joint. The center of the supporting part 92 is provided with a tapered hole 921 or a trumpet hole capable of accommodating the swing of the outer needle 40. The bottom surface of the supporting part 92 can be provided with an adhesive 93 for bonding and fixing with the skin at the puncture position.

[0080] Since the U-shaped groove 150 is arranged on the rotating core 15, when the U-shaped groove 150 of each rotating core 15 is rotated to be aligned with the second avoiding groove 143, the outer needle 40 can smoothly enter the inside of the U-shaped groove 150 (i.e., the center position of the rotating core 15). Then, rotating each rotating core 15 makes the U-shaped groove 150 deviate from the second avoiding groove 143, so that the peripheral wall of the outer needle 40 is in contact with the center groove wall of at least one U-shaped groove 150 at each angle. This is equivalent to that the center semicircular groove walls of each U-shaped groove 150 jointly form a guide needle hole. When the inner needle 50 and the outer needle 40 are disassembled, the guide block 14 does not need to be disassembled again, thereby improving the disassembly convenience of the inner needle 50 and the outer needle 40.

[0081] For example, in the present embodiment, referring to Figure 6 and Figure 10 , each rotating core 15 is sequentially provided with a first rotating core 151, a second rotating core 152, and a third rotating core 153 from the inside of the core cavity 142 to the mouth. The mouth of the core cavity 142 is provided with a cover plate 154, and the cover plate 154 is provided with a third avoiding groove 1541 aligned with the second avoiding groove 143.

[0082] The cavity bottom of the core cavity 142 is provided with a first limiting arc groove 1421, the side wall of the first rotating core 151 away from the bottom of the core cavity 142 is provided with a first limiting column 1511 which extends into the first limiting arc groove 1421; the side wall of the first rotating core 151 away from the bottom of the core cavity 142 is provided with a second limiting arc groove 1512, the side wall of the second rotating core 152 towards the first rotating core 151 is provided with a second limiting column 1521 which extends into the second limiting arc groove 1512; the side wall of the second rotating core 152 away from the first rotating core 151 is provided with a third limiting arc groove 1522, the side wall of the third rotating core 153 towards the second rotating core 152 is provided with a third limiting column 1531 which extends into the third limiting arc groove 1522; the side wall of the third rotating core 153 away from the second rotating core 152 is provided with an operating handle 1532 which extends out of the core cavity 142 through the cover plate 154;

[0083] In the needle mounting state, each limiting column abuts against one end of the corresponding limiting arc groove in the same circumferential direction, and in the needle guiding state, each limiting column abuts against the other end of the corresponding limiting arc groove in the circumferential direction.

[0084] Specifically, in the needle mounting state, the operating handle 1532 is first rotated in the forward direction. First, the third rotating core 153 rotates to the position where the third limiting column 1531 abuts against one end of the third limiting arc groove 1522, at which time the U-shaped groove 150 of the third rotating core 153 is offset by 90° from the second avoiding groove 143. Continued rotation causes the third rotating core 153 to begin to rotate the second rotating core 152, until the second limiting column 1521 abuts against one end of the second limiting arc groove 1512. At this time, the U-shaped groove 150 of the second rotating core 152 is offset by 90° from the second avoiding groove 143. Continued rotation causes the third rotating core 153 to rotate the second rotating core 152, which in turn rotates the first rotating core 151, until the first limiting column 1511 abuts against one end of the first limiting arc groove 1421. At this time, the U-shaped groove 150 of the first rotating core 151 is offset by 90° from the second avoiding groove 143. At this time, the operating handle 1532 cannot be further rotated in the forward direction. The U-shaped grooves 150 of the three rotating cores 15 are respectively offset by 90°, 180° and 270° from the second avoiding groove 143, thereby forming a complete needle guiding hole and achieving the needle guiding state. When the operating handle 1532 is rotated in the reverse direction in the needle guiding state, the three rotating cores 15 are rotated in the reverse direction by 90°, 180° and 270° in turn, so that the U-shaped grooves 150 are re-aligned with the second avoiding groove 143. The inner needle 50 and the outer needle 40 are simple and efficient to disassemble and assemble, and the guiding stability of the outer needle 40 in the needle guiding state is ensured, thereby ensuring the puncture accuracy.

[0085] It should be understood that, in the present embodiment, as Figure 1As shown, the drive cavity 11 is provided with a battery 70 and a control circuit board 80, the control circuit board 80 is electrically connected with the electromagnetic ejection mechanism 30 and the drive assembly 60 respectively, two circuit switches 81 electrically connected with the control circuit board 80 are arranged on the side wall of the shell 10, and a charging socket 82 electrically connected with the control circuit board 80 is arranged on the side wall of the shell 10, one of the circuit switches 81 is used for controlling the electromagnetic ejection mechanism 30, and the other circuit switch 81 is used for controlling the drive assembly 60.

[0086] Since the drive seat 20 has a space between the top wall and the bottom wall of the drive cavity 11 when reaching the upper and lower limit positions, the power source of the drive assembly 60 is arranged at the top space of the drive cavity 11, and the battery 70 and the control circuit board 80 are arranged at the bottom space of the drive cavity 11, so that the structural compactness is improved; the charging socket 82 is arranged to facilitate charging the battery 70, and the two circuit switches 81 are arranged to control the electromagnetic ejection mechanism 30 and the drive assembly 60 respectively; wherein the control mode of the electromagnetic ejection mechanism 30 is that the electromagnetic ejection mechanism 30 performs an action once by pressing the circuit switch 81 once, specifically, the coil 33 is powered for 0.1s and then loses power, and the control mode of the drive assembly 60 is that the corresponding circuit switch 81 has three gears, one of which controls the drive assembly 60 to drive the drive seat 20 to descend, the other controls the drive assembly 60 to drive the drive seat 20 to ascend, and the third controls the drive assembly 60 to stop. The above control principle itself is a conventional control mode, and the implementation principle will not be described in detail.

[0087] The above only describes the preferred embodiments of the present application and should not be used to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A nephrology puncture device, characterized in that, include: The housing includes a drive cavity and a needle cavity located on the side of the drive cavity and communicating with the drive cavity; A drive seat is slidably connected to the drive cavity and is provided with an electromagnetic ejection mechanism. The output end of the electromagnetic ejection mechanism is provided with a first needle seat. The first needle seat is slidably connected to the needle cavity and is detachably connected to an outer needle. A second needle seat is provided on one side of the drive seat. The second needle seat is slidably connected to the needle cavity and is detachably connected to an inner needle. The inner needle passes downward through the interior of the outer needle and has a hook groove at its lower end. A drive assembly is located inside the drive cavity, and its output end is connected to the drive seat. It is used to drive the drive seat, and in turn drive the inner needle and the outer needle to extend and retract synchronously up and down. The electromagnetic ejection mechanism is used to drive the outer needle to move upward to expose the hook groove, and after reaching the upper limit position, it rebounds to reset so as to cut off the sample that has fallen into the hook groove. The electromagnetic catapult mechanism includes: A slide block is slidably connected to the drive seat. The first needle seat is provided on one side of the slide block. A cylindrical hole that runs vertically through the center of the slide block is provided. Multiple permanent magnet rings are distributed sequentially along the axial direction of the inner peripheral wall of the cylindrical hole. The magnetic poles of adjacent permanent magnet rings are opposite. The iron core is coaxially disposed in the cylindrical hole, and its bottom end is fixedly connected to the drive seat and provided with a positioning magnetic plate. Multiple magnetic discs are distributed at intervals between the top of the iron core and the positioning magnetic plate. A coil is wound between the positioning magnetic plate and the bottommost magnetic disc, as well as between each two adjacent magnetic discs, and the winding directions of adjacent coils are opposite. Two sets of elastic elements are respectively disposed on the upper and lower sides of the slide and between the drive seat; The positioning magnetic conductive sheet is magnetically connected to the bottommost permanent magnet ring in the vertical direction, and each magnetic conductive disc is aligned with the bonding area of ​​two adjacent permanent magnet rings; when the coil is energized, the magnetic poles obtained on the positioning magnetic conductive sheet are opposite in direction to the magnetic poles of the bottommost permanent magnet ring. The drive unit includes: The drive frame has multiple sliding rods arranged in an array that pass downward through the slide block, and each of the sliding rods is slidably engaged with the slide block. The drive frame is connected to the output end of the drive assembly. The first slide plate is located between the drive frame and the slide base and is fixedly connected to each of the slide rods. A second pin seat is provided on one side of the first slide plate. A ring magnet is embedded in the bottom wall of the first slide plate. The magnetic poles of the ring magnet are opposite to the magnetic poles of the uppermost permanent magnet ring. The second slide plate is slidably connected to each of the slide rods and is located below the slide block. The second slide plate is fixed to the bottom end of the iron core, and a screw sleeve is provided at the center of the second slide plate. The adjusting sleeve has its top end rotatably connected to the center of the first sliding plate, and its bottom end is screwed into the threaded sleeve.

2. The nephrology puncture device as described in claim 1, characterized in that, Each of the permanent magnet rings is radially magnetized, and the diameter of the positioning magnetic guide plate is smaller than the magnetic pole dividing line of the permanent magnet ring; each of the magnetic guide discs has a magnetic guide ring on its edge, and the two ends of the magnetic guide ring extend symmetrically to the upper and lower sides of the magnetic guide disc, respectively.

3. The nephrology puncture device as described in claim 1, characterized in that, The driving component includes: The operating head is located on the bottom wall of the housing and is connected to the adjusting sleeve; A fixed partition is disposed inside the drive cavity and located above the drive frame; A drive rod passes through the adjusting sleeve and slides with the adjusting sleeve. The drive rod passes through the drive frame and is screwed to the drive frame. The top end of the drive rod rotates with the fixed partition and the bottom end rotates with the operating head. The motor is fixedly connected inside the drive cavity and located above the fixed partition. The output end of the motor faces downward and is provided with a central gear. An internal gear ring is fixedly connected to the top wall of the fixed partition and is coaxial with the central gear; A planetary carrier is fixedly mounted on the top of the drive rod. Multiple planetary gears are evenly distributed around the drive rod in a circumferential direction on the planetary carrier, and the planetary gears are meshed with the internal gear ring and the central gear.

4. The nephrology puncture device as described in claim 3, characterized in that, The drive rod is fitted with a telescopic sleeve, the bottom end of which is connected to the operating head and the top end of which is connected to the adjusting sleeve; the telescopic sleeve includes a plurality of sleeve sections nested together in sequence, and the inner and outer adjacent sleeve sections are engaged by a sliding key extending along the axial direction of the drive rod. The top of the operating head extends into the driving cavity and has a connecting blind hole in the center that rotates with the bottom end of the driving rod. A disc spring is provided in the connecting blind hole, and the disc spring abuts against the bottom end of the driving rod. The bottom wall of the housing has a through hole at its center, which is suitable for rotating the operating head. The inner wall of the through hole has a spline groove extending along its axial direction. The peripheral wall of the operating head has a spline segment that slides with the spline groove. The top of the operating head also has a positioning retaining ring with a diameter larger than the inner diameter of the through hole. The positioning ring abuts against the inner bottom wall of the drive cavity under the elastic pushing action of the disc spring on the operating head, and the spline segment is correspondingly embedded in the spline groove. When the operating head is pressed upward until the positioning ring separates from the inner bottom wall of the drive cavity, the spline segment slides out of the spline groove.

5. The nephrology puncture device as described in claim 1, characterized in that, The needle cavity has two opposite inner sidewalls with slides, and the first needle seat and the second needle seat are slidably connected to the slides; the sidewall of the housing has a needle loading slot communicating with the needle cavity; the outer wall of the housing is slidably connected to a movable cover plate, which has a closed state that slides to cover the needle loading slot and an open state that slides to expose the needle loading slot. The needle cavity has a guide block at its bottom end, and the guide block has a guide hole that matches the diameter of the outer needle; the first needle seat has a first slot suitable for holding the outer needle, and the first needle seat has a first clearance groove facing the needle loading slot; the second needle seat has a second slot suitable for holding the inner needle.

6. The nephrology puncture device as described in claim 5, characterized in that, The bottom wall of the guide block has a threaded hole at its center, which is used to screw a fixed connector. The connector is adapted to fit and support the skin, and the support angle is adjustable. The top wall of the guide block has a core cavity. The side of the guide block facing the needle slot has a second clearance groove that communicates with the core cavity. Multiple rotating cores are rotatably connected in the core cavity. Each rotating core has a U-shaped groove that extends from its center to its edge. Each rotating core can be rotated sequentially to a needle-loading state where each U-shaped groove is aligned with the second clearance groove, and also to a guide-needle state where each U-shaped groove is staggered from the second clearance groove. In the guide-needle state, the semi-circular wall surface of each U-shaped groove at the center of the rotating core together forms the guide-needle hole.

7. The nephrology puncture device as described in claim 6, characterized in that, Each of the rotating cores is sequentially named a first rotating core, a second rotating core, and a third rotating core from the inside of the core cavity to the opening. The opening of the core cavity is provided with a cover plate, and the cover plate is provided with a third clearance groove aligned with the second clearance groove. The core cavity has a first limiting arc groove at its bottom, and a first limiting post on the side wall of the first rotating core facing the bottom of the core cavity, extending into the first limiting arc groove; the first rotating core has a second limiting arc groove on the side wall of the first rotating core away from the bottom of the core cavity, and a second limiting post on the side wall of the second rotating core facing the first rotating core, extending into the second limiting arc groove; the second rotating core has a third limiting arc groove on the side wall of the second rotating core away from the first rotating core, and a third limiting post on the side wall of the third rotating core facing the second rotating core, extending into the third limiting arc groove; the third rotating core has an operating handle on the side wall of the third rotating core away from the second rotating core, the operating handle passing through the cover plate and extending out of the core cavity; In the needle-loading state, each of the limiting posts abuts against one end of the corresponding limiting arc groove in the same circumferential direction; in the guide needle state, each of the limiting posts abuts against the other end of the corresponding limiting arc groove in the same circumferential direction.

8. The nephrology puncture device according to any one of claims 1-7, characterized in that, The drive cavity is equipped with a battery and a control circuit board. The control circuit board is electrically connected to the electromagnetic catapult mechanism and the drive assembly, respectively. The side wall of the housing is equipped with two circuit switches that are electrically connected to the control circuit board, and a charging port that is electrically connected to the control circuit board. One of the circuit switches is used to control the electromagnetic catapult mechanism, and the other circuit switch is used to control the drive assembly.

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