Guide needle positioning device for internal fistula puncture

Abstract

The invention relates to the technical field of puncture auxiliary instruments, and discloses a guide needle positioning device for internal fistula puncture, which comprises a puncture needle, a fixing clamp and an adjusting rod, one end of the adjusting rod is connected with the fixing clamp, and one end of the adjusting rod is provided with a needle insertion measuring unit and a needle insertion fixing unit; the inserted needle measuring unit is arranged at the other end of the adjusting rod, and the inserted needle fixing unit is arranged on the inserted needle measuring unit; through mutual cooperation of a needle inserting limiting part, a measuring part and a needle base limiting part in the needle inserting measuring unit, the needle inserting limiting part can limit the position of a puncture needle when no thrust exists, the measuring part can monitor the puncture depth of the puncture needle when the needle base is pushed and moved, and therefore the puncture depth can be accurately known, and the puncture accuracy is improved. The puncture is more accurate, the needle inserting depth is accurately controlled, the success rate of puncture is improved, and the needle base limiting component is arranged, so that the movable needle base keeps still when no thrust exists.

Description

Technical Field

[0001] The invention relates to the technical field of puncture auxiliary instruments, and in particular to a guide needle positioning device for internal fistula puncture. Background Art

[0002] Fistula puncture is a common medical procedure for treating patients with renal failure who are undergoing hemodialysis. The process involves inserting a needle accurately into the patient's blood vessels to establish a hemodialysis channel. Fistulas are usually located in the forearm and are a pathway formed by direct surgical anastomosis of an artery and a vein. This vascular anastomosis can increase blood flow in the vein, making it strong enough to be used to transport and recover blood during dialysis. There are three main methods for fistula puncture: regional puncture, rope ladder puncture, and buttonhole puncture. Regional puncture is the earliest method, but it may cause vascular damage and complications after long-term use. Rope ladder puncture is to evenly distribute the puncture points on the fistula and use them alternately. This method can reduce the risk of complications. The buttonhole puncture method is a professional doctor who selects specific points for puncture. It is suitable for patients with good fistula function, but attention should be paid to possible infection and vascular stenosis.

[0003] When performing arteriovenous fistula puncture, doctors usually need to be very careful to select the correct puncture path and ensure that the needle can accurately enter the target blood vessel. However, due to the lack of precise tools to assist this process, doctors can only rely on their own experience and feeling to perform the operation. Due to the lack of auxiliary tools, it is impossible to accurately control the depth of the needle insertion. Punctures are performed based on experience and feeling, resulting in inaccurate judgments. This not only increases the difficulty of the operation, but also increases the risk of puncture failure. In addition, when performing arteriovenous fistula puncture for hemodialysis patients, the puncture needle is only held and fixed by hand, which will cause the puncture path to deviate, increase the patient's pain, and affect the success rate of the puncture. Summary of the invention

[0004] In view of the problems existing in the prior art, a guide needle positioning device for internal fistula puncture is proposed.

[0005] The technical solution of the present invention is: a guide needle positioning device for internal fistula puncture, comprising a puncture needle, a fixing clamp and an adjusting rod, one end of the adjusting rod is connected to the fixing clamp, and one end of the adjusting rod is provided with a needle insertion measurement unit and a needle insertion fixing unit;

[0006] The needle insertion measuring unit is arranged at the other end of the adjusting rod, and the needle insertion fixing unit is arranged on the needle insertion measuring unit;

[0007] The needle insertion measurement unit comprises a needle insertion limiting component, the needle insertion limiting component is arranged at the other end of the adjusting rod, a measuring component is arranged on the needle insertion limiting component, and a needle seat limiting component is also arranged on the needle insertion limiting component;

[0008] The needle advancement limiting component includes a connecting frame, the measuring component is fixedly connected to the other end of the adjusting rod, a support plate is rotatably connected to the connecting frame, two parallel guide rods are symmetrically fixedly connected to the upper surface of the support plate, a movable needle seat is slidably sleeved on the two guide rods, a U-shaped block is fixedly connected to the upper surface of the support plate, two limiting cylinders are symmetrically arranged on the U-shaped block, a ball is movably arranged in the limiting cylinder, a reset spring is arranged in the limiting cylinder, one end of the reset spring is fixedly connected to the inner wall of the limiting cylinder, the other end of the reset spring is connected to the ball, and a needle placement groove is provided on the top of the movable needle seat.

[0009] Furthermore, the measuring component includes a measuring shell, a measuring horizontal axis is coaxially fixedly connected to the measuring shell, a measuring cylinder is rotatably sleeved on the measuring horizontal axis, a coil spring is arranged in the measuring cylinder, one end of the coil spring is fixedly connected to the inner wall of the measuring cylinder, and the other end of the coil spring is fixedly connected to the axis wall of the measuring horizontal axis, a measuring tape is arranged in the measuring shell, the measuring tape is wound on the measuring cylinder, one end of the measuring tape is fixedly connected to the outer wall of the measuring cylinder, the other end of the measuring tape passes through the measuring shell and extends to the outside and is fixedly connected to the seat wall of the movable needle seat, and a measuring pointer is fixedly connected to the upper surface of the support plate.

[0010] Furthermore, the needle seat limiting component includes a receiving groove, which is opened at the bottom of the movable needle seat, a rolling ball is movably arranged in the receiving groove, a buffer spring is arranged in the receiving groove, the top end of the buffer spring is fixedly connected to the inner wall of the receiving groove, the bottom end of the buffer spring is against the ball wall of the rolling ball, and the outer wall of the rolling ball is against the top of the movable needle seat.

[0011] Furthermore, the needle insertion fixing unit includes a needle pressing component, a position limiting component is arranged on the needle pressing component, the needle pressing component is arranged on the needle insertion limiting component, and the position limiting component is arranged on the needle pressing component.

[0012] Furthermore, the needle pressing component includes an arc-shaped pressing block, the arc groove of the arc-shaped pressing block is arranged opposite to the needle releasing groove, the top of the movable needle seat is fixedly connected with a vertical tube, the tube wall of the vertical tube is provided with a vertical guide groove and a spiral guide groove, the top of the vertical guide groove is connected with one end of the spiral guide groove, a threaded sleeve and a vertical threaded rod are movably arranged in the vertical tube, the bottom end of the vertical threaded rod is rotatably connected to the top of the movable needle seat, the top end of the vertical threaded rod is extended to the top of the vertical tube and is fixedly connected with a needle pressing handle, the threaded sleeve is threadedly sleeved on the vertical threaded rod, a rotating ring is rotatably sleeved on the threaded sleeve, a connecting cross bar is fixedly connected to the outer wall of the rotating ring, one end of the connecting cross bar passes through the vertical guide groove and is fixedly connected to the block wall of the arc-shaped pressing block.

[0013] Furthermore, the position limiting component includes a fixed shaft, the bottom end of the fixed shaft is fixedly connected to the top of the moving needle seat, one end of the fixed shaft is rotatably sleeved with a gear, a long slot is provided on the tube wall of the vertical tube, an adjusting rack is provided on one side of the gear, and a limiting rack is provided on the other side of the gear, the tooth grooves of the limiting rack and the adjusting rack are in opposite directions, the limiting rack and the adjusting rack are both meshed with the gear, one end of the adjusting rack passes through the long slot and is fixedly connected to the top of the threaded sleeve, a limiting hole matching the limiting rack is penetrated on the moving needle seat, a long strip hole is penetrated on the moving needle seat, a T-shaped slide rail is longitudinally penetrated and slidably connected on the limiting rack, and the T-shaped slide rail is fixedly connected to the seat wall of the moving needle seat.

[0014] Furthermore, an adjusting shaft is fixedly connected to the support plate, the adjusting shaft is coaxially arranged with the rotation point of the support plate and the connecting frame, and a worm gear is fixedly sleeved on one end of the adjusting shaft.

[0015] Furthermore, a worm is longitudinally penetrated through the wall of the connecting frame and is rotatably connected thereto, the worm is meshed with a worm wheel, and a limiting handle is fixedly connected to the top end of the worm.

[0016] Beneficial effects of the present invention:

[0017] 1. Through the mutual cooperation of the needle insertion limit component, the measuring component and the needle seat limit component in the needle insertion measurement unit, the needle insertion limit component can limit the position of the puncture needle when there is no thrust, and the measuring component can monitor the puncture depth of the puncture needle when the movable needle seat is pushed, so that the puncture depth can be accurately understood, the puncture is more accurate, the needle insertion depth can be accurately controlled, and the success rate of puncture is improved. The needle seat limit component is set so that the movable needle seat remains stationary when there is no thrust.

[0018] 2. Through the coordinated arrangement of the needle pressing component and the position limiting component in the needle insertion fixing unit, the puncture needle is pressed and fixed on the movable needle seat by the needle pressing component, so that the puncture needle will not be easily deviated during puncture, thereby improving accuracy. In addition, through the arrangement of the position limiting component, when the limiting rack is inserted into the limiting hole, the measuring pointer just points to the zero scale value on the measuring tape, thereby ensuring that the measuring pointer is just aligned with the zero scale value on the measuring tape at the beginning, and the limiting rack is inserted into the limiting hole, and the movable needle seat is initially limited and will not move.

[0019] 3. By adjusting the mutual cooperation of the shaft, worm gear, worm and limiting handle, the angle of the support plate can be adjusted, and then the angle of the puncture needle can be adjusted, so that the operator can keep the puncture angle of the puncture needle stable according to the puncture needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the needle insertion limiting component in the present invention;

[0022] Figure 3 It is a structural schematic diagram of the measuring component in the present invention;

[0023] Figure 4 It is a cross-sectional view of the U-shaped block in the present invention;

[0024] Figure 5 It is a cross-sectional view of the movable needle seat in the present invention;

[0025] Figure 6 It is a structural schematic diagram of the measuring housing in the present invention;

[0026] Figure 7 It is a structural schematic diagram of the needle pressing component in the present invention;

[0027] Figure 8 It is a structural schematic diagram of the vertical pipe in the present invention;

[0028] Fig. 9 It is a schematic diagram of the local structure of the needle insertion fixing unit in the present invention;

[0029] Fig.10 It is an enlarged view of point A in the present invention;

[0030] Fig.11 It is a structural schematic diagram of the worm gear in the present invention.

[0031] In the figure: 1, guide needle; 2, fixing clamp; 3, adjusting rod; 4, needle insertion measuring unit; 41, needle insertion limiting component; 411, connecting frame; 412, supporting plate; 413, guide rod; 414, movable needle seat; 415, U-shaped block; 416, limiting cylinder; 417, ball; 418, return spring; 419, needle placement groove; 42, measuring component; 421, measuring shell; 422, measuring horizontal axis; 423, measuring cylinder; 424, coil spring; 425, measuring tape; 426, measuring pointer; 43, needle seat limiting component; 431, receiving groove; 432, rolling ball; 433 , buffer spring; 5, needle fixing unit; 51, needle pressing component; 511, arc-shaped pressing block; 512, vertical tube; 513, vertical guide groove; 514, spiral guide groove; 515, threaded sleeve; 516, vertical threaded rod; 517, needle pressing handle; 518, rotating ring; 519, connecting cross bar; 52, position limiting component; 521, fixed shaft; 522, gear; 523, long notch; 524, adjusting rack; 525, limiting rack; 526, limiting hole; 527, long hole; 528, T-type slide rail; 6, adjusting shaft; 7, worm wheel; 8, worm; 9, limiting handle. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0033] Example 1, reference Figure 1-4 , which is the first embodiment of the present invention, provides a guide needle positioning device for internal fistula puncture, including a puncture needle 1, a fixing clamp 2 and an adjusting rod 3, one end of the adjusting rod 3 is connected to the fixing clamp 2, the fixing clamp 2 adopts the existing technology, and can be clamped on the edge of a bed or a table, so that the device can be fixed beside the patient for use, the adjusting rod 3 adopts the existing technology, and can be adjusted in the three-axis directions of X, Y, and Z. One end of the adjusting rod 3 is provided with a needle insertion measurement unit 4 and a needle insertion fixing unit 5; the needle insertion measurement unit 4 is arranged at the other end of the adjusting rod 3, and the needle insertion fixing unit 5 is arranged on the needle insertion measurement unit 4;

[0034] The needle insertion measuring unit 4 includes a needle insertion limiting component 41, which is arranged at the other end of the adjusting rod 3, and a measuring component 42 is arranged on the needle insertion limiting component 41, and a needle seat limiting component 43 is also arranged on the needle insertion limiting component 41; the needle insertion limiting component 41 includes a connecting frame 411, and the measuring component 42 is fixedly connected to the other end of the adjusting rod 3, and a supporting plate 412 is rotatably connected to the connecting frame 411, and the upper surface of the supporting plate 412 is symmetrically fixedly connected with two parallel guide rods 413, and the two guide rods 413 are symmetrically fixedly connected to the upper surface of the supporting plate 412. A movable needle seat 414 is provided on the common sliding sleeve of the rod 413, a U-shaped block 415 is fixedly connected to the upper surface of the support plate 412, two limiting cylinders 416 are symmetrically provided on the U-shaped block 415, a ball 417 is movably provided in the limiting cylinder 416, a return spring 418 is provided in the limiting cylinder 416, one end of the return spring 418 is fixedly connected to the inner wall of the limiting cylinder 416, and the other end of the return spring 418 is connected to the ball 417, and a needle placement groove 419 is provided on the top of the movable needle seat 414.

[0035] Specifically, the puncture needle 1 is placed in the U-shaped groove of the U-shaped block 415, and the puncture needle 1 is placed in the needle placement groove 419. When the puncture needle 1 is placed in the U-shaped groove of the puncture needle 1, the ball 417 is squeezed so that the return spring 418 is elastically compressed, and the ball 417 presses against the needle wall of the puncture needle 1, so that the puncture needle 1 remains stationary when there is no external force. The angle of the support plate 412 can be adjusted by rotating the support plate 412 along the rotation connection point with the connecting frame 411. The U-shaped groove of the U-shaped block 415 and the needle placement groove 419 on the movable needle seat 414 are both used to place the puncture needle 1.

[0036] Reference Figure 1-6 The measuring component 42 includes a measuring shell 421, a measuring horizontal axis 422 is coaxially fixedly connected in the measuring shell 421, a measuring cylinder 423 is rotatably sleeved on the measuring horizontal axis 422, a coil spring 424 is arranged in the measuring cylinder 423, one end of the coil spring 424 is fixedly connected to the inner wall of the measuring cylinder 423, and the other end of the coil spring 424 is fixedly connected to the shaft wall of the measuring horizontal axis 422, a measuring tape 425 is arranged in the measuring shell 421, the measuring tape 425 is wound on the measuring cylinder 423, one end of the measuring tape 425 is fixedly connected to the outer wall of the measuring cylinder 423, the other end of the measuring tape 425 passes through the measuring shell 421 and extends to the outside and is fixedly connected to the seat wall of the movable needle seat 414, and a measuring pointer 426 is fixedly connected to the upper surface of the support plate 412.

[0037] Specifically, the measuring tape 425 is pulled to move and extend out of the measuring housing 421 , and the measuring cylinder 423 rotates, and the coil spring 424 produces elastic deformation. As the puncture needle 1 penetrates deeper, the measuring pointer 426 points to the scale value on the measuring tape 425 , which is the puncture depth of the puncture needle 1 .

[0038] Reference Figure 1-6 The needle seat limiting component 43 includes a receiving groove 431, which is opened at the bottom of the movable needle seat 414. A rolling ball 432 is movably arranged in the receiving groove 431. A buffer spring 433 is arranged in the receiving groove 431. The top end of the buffer spring 433 is fixedly connected to the inner wall of the receiving groove 431, and the bottom end of the buffer spring 433 is against the ball wall of the rolling ball 432, and the ball outer wall of the rolling ball 432 is against the top of the movable needle seat 414.

[0039] Specifically, when the rolling ball 432 abuts against the top of the moving needle seat 414 , the buffer spring 433 is in an elastically compressed state, so that the rolling ball 432 abuts against the moving needle seat 414 under the action of the rebound force.

[0040] Example 2, reference Figure 1-9 , which is the second embodiment of the present invention, and this embodiment is different from the first embodiment in that: the needle insertion fixing unit 5 includes a needle pressing component 51, and a position limiting component 52 is arranged on the needle pressing component 51, the needle pressing component 51 is arranged on the needle insertion limiting component 41, and the position limiting component 52 is arranged on the needle pressing component 51; the needle pressing component 51 includes an arc-shaped pressing block 511, and the arc groove of the arc-shaped pressing block 511 is arranged opposite to the needle placing groove 419, and a vertical tube 512 is fixedly connected to the top of the movable needle seat 414, and a vertical guide groove 513 and a spiral guide groove 514 are opened on the tube wall of the vertical tube 512, and the vertical guide groove 513 is arranged on the wall of the vertical guide groove 513. The top is connected with one end of the spiral guide groove 514, and a threaded sleeve 515 and a vertical threaded rod 516 are movably arranged in the vertical tube 512. The bottom end of the vertical threaded rod 516 is rotatably connected to the top of the movable needle seat 414. The top of the vertical threaded rod 516 extends above the vertical tube 512 and is fixedly connected with a needle pressing handle 517. The threaded sleeve 515 is threadedly sleeved on the vertical threaded rod 516. A rotating ring 518 is rotatably sleeved on the threaded sleeve 515. A connecting cross bar 519 is fixedly connected to the outer wall of the rotating ring 518. One end of the connecting cross bar 519 passes through the vertical guide groove 513 and is fixedly connected to the block wall of the arc-shaped pressing block 511.

[0041] Specifically, by rotating the needle pressing handle 517, the vertical threaded rod 516 is driven to rotate, so that the threaded sleeve 515 moves downward. The downward movement of the threaded sleeve 515 drives the rotating ring 518 and the adjusting rack 524 to move downward together. When the rotating ring 518 moves downward, it drives the connecting cross bar 519 to move along the spiral guide groove 514 first, until the connecting cross bar 519 enters the vertical guide groove 513 from the spiral guide groove 514. At this time, the connecting cross bar 519 drives the arc-shaped clamping block 511 to move to the top of the needle placing groove 419, and continues to rotate the needle pressing handle 517 to move the arc-shaped clamping block 511 to the bottom and engage with the movable needle seat 414.

[0042] Reference Figure 1-9The position limiting component 52 includes a fixed shaft 521, the bottom end of the fixed shaft 521 is fixedly connected to the top of the movable needle seat 414, one end of the fixed shaft 521 is rotatably sleeved with a gear 522, a long notch 523 is opened on the wall of the vertical tube 512, one side of the gear 522 is provided with an adjustment rack 524, and the other side of the gear 522 is provided with a limiting rack 525, the tooth grooves of the limiting rack 525 and the adjusting rack 524 are opposite to each other, and the limiting rack 525 and the adjusting rack 524 are opposite to each other. The segment racks 524 are all meshed with the gears 522, and one end of the adjusting rack 524 passes through the long slot 523 and is fixedly connected to the top of the threaded sleeve 515. A limiting hole 526 matching the limiting rack 525 is penetrated through the movable needle seat 414, and a long hole 527 is penetrated through the movable needle seat 414. A T-shaped slide rail 528 is longitudinally penetrated and slidably connected to the limiting rack 525, and the T-shaped slide rail 528 is fixedly connected to the seat wall of the movable needle seat 414.

[0043] Specifically, when the adjustment rack 524 moves upward, it drives the gear 522 to rotate. The rotation of the gear 522 causes the limiting rack 525 to slide downward along the T-shaped slide rail 528 until the lower part of the limiting rack 525 is inserted into the limiting hole 526. By allowing the limiting rack 525 to be inserted into the limiting hole 526 and providing the long hole 527, when the limiting rack 525 corresponds to the long hole 527, the rack 525 can be extended into the long hole 527, so that the support plate 412 will not hinder the downward movement of the limiting rack 525.

[0044] The remaining structures are the same as those of Example 1.

[0045] Example 3, reference Figure 1-11 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: an adjusting shaft 6 is fixedly connected to the support plate 412, and the adjusting shaft 6 is coaxially arranged with the rotation point of the support plate 412 and the connecting frame 411, and a worm gear 7 is fixedly sleeved on one end of the adjusting shaft 6; a worm 8 is longitudinally penetrated through the wall of the connecting frame 411 and is rotatably connected, and the worm 8 is meshed with the worm gear 7, and a limiting handle 9 is fixedly connected to the top of the worm 8.

[0046] Specifically, the worm 8 is driven to rotate by rotating the limiting handle 9, the worm 8 drives the worm wheel 7 to rotate, and the worm wheel 7 drives the adjusting shaft 6 to rotate the support plate 412, so that the angle of the support plate 412 can be adjusted, and the cooperation of the worm wheel 7 and the worm 8 has a locking function, so that when it is not rotating, the angle of the support plate 412 is locked; the rest of the structure is the same as that of Example 1.

[0047] Reference Figure 1-11 The working principle of the guide needle positioning device for fistula puncture in the present invention is as follows:

[0048] When in use, the puncture needle 1 is placed in the U-shaped groove of the U-shaped block 415, and the puncture needle 1 is placed in the needle placement groove 419. When the puncture needle 1 is placed in the U-shaped groove of the puncture needle 1, the ball 417 is squeezed so that the return spring 418 is elastically compressed, and the ball 417 is pressed against the needle wall of the puncture needle 1, so that the puncture needle 1 is restricted when there is no thrust, and then the vertical threaded rod 516 is driven to rotate by rotating the needle pressing handle 517, and the vertical threaded rod 516 is threadedly matched with the threaded sleeve 515, so that the threaded sleeve 515 moves downward.

[0049] The threaded sleeve 515 moves downward, driving the rotating ring 518 and the adjusting rack 524 to move downward together. When the rotating ring 518 moves downward, it drives the connecting cross bar 519 to move along the spiral guide groove 514 first, until the connecting cross bar 519 enters the vertical guide groove 513 from the spiral guide groove 514. At this time, the connecting cross bar 519 drives the arc-shaped pressing block 511 to move to the top of the needle placement groove 419, and the needle pressing handle 517 is continuously rotated to move the arc-shaped pressing block 511 to the bottom, so that the arc-shaped pressing block 511 presses the puncture needle 1, so that the position of the puncture needle 1 is fixed;

[0050] At the same time, the threaded sleeve 515 drives the adjusting rack 524 to move synchronously, the adjusting rack 524 moves downward to drive the gear 522 to rotate, and the gear 522 drives the limiting rack 525 to move upward, so that the lower part of the limiting rack 525 moves out of the limiting hole 526. At this time, the movable needle seat 414 can be pushed to move, and because the rolling ball 432 is against the upper surface of the support plate 412, the buffer spring 433 is in an elastically compressed state. In this way, when there is no thrust, the movable needle seat 414 will not move.

[0051] The operator rotates the limiting handle 9 to drive the worm 8 to rotate, the worm 8 drives the worm wheel 7 to rotate, and the worm wheel 7 drives the adjusting shaft 6 to rotate the support plate 412, so that the angle of the support plate 412 changes, and the insertion angle of the puncture needle 1 is adjusted by adjusting the angle of the support plate 412. After the puncture needle 1 is adjusted to the required insertion angle, the limiting handle 9 is stopped, and the needle head of the puncture needle 1 corresponds to the puncture site of the patient, and then the needle seat 414 and the puncture needle 1 are pushed to move to make the puncture The needle 1 punctures to the patient's puncture position, and while pushing the movable needle seat 414, the movable needle seat 414 pulls the measuring tape 425 to move, and the measuring tape 425 extends out of the measuring shell 421, then the measuring cylinder 423 rotates, and the coil spring 424 produces elastic deformation. As the puncture needle 1 penetrates deeper, the measuring pointer 426 points to the scale value on the measuring tape 425, which is the puncture depth of the puncture needle 1, so that the operator can accurately understand the puncture depth, making the puncture more accurate.

[0052] By setting the long hole 527, when the limiting rack 525 corresponds to the long hole 527, the vertical threaded rod 516 can be rotated by rotating the needle pressing handle 517 in the opposite direction to drive the threaded sleeve 515 to move upward, and the threaded sleeve 515 drives the connecting cross bar 519 to move the arc-shaped clamping block 511 upward. When the connecting cross bar 519 enters the spiral guide groove 514 from the vertical guide groove 513, the arc-shaped clamping block 511 rotates to be offset from the puncture needle 1, so that the puncture needle 1 can be easily removed.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A guide needle positioning device for internal fistula puncture, comprising a puncture needle (1), a fixing clamp (2) and an adjusting rod (3), one end of the adjusting rod (3) being connected to the fixing clamp (2), characterized in that: One end of the adjusting rod (3) is provided with a needle insertion measuring unit (4) and a needle insertion fixing unit (5); The needle insertion measurement unit (4) is arranged at the other end of the adjustment rod (3), and the needle insertion fixing unit (5) is arranged on the needle insertion measurement unit (4); The needle insertion measurement unit (4) comprises a needle insertion limiting component (41), the needle insertion limiting component (41) is arranged at the other end of the adjusting rod (3), a measuring component (42) is arranged on the needle insertion limiting component (41), and a needle seat limiting component (43) is also arranged on the needle insertion limiting component (41); The needle-entry limiting component (41) comprises a connecting frame (411), the measuring component (42) is fixedly connected to the other end of the adjusting rod (3), a supporting plate (412) is rotatably connected to the connecting frame (411), two parallel guide rods (413) are symmetrically fixedly connected to the upper surface of the supporting plate (412), a movable needle seat (414) is slidably sleeved on the two guide rods (413), and a U-shaped block (414) is fixedly connected to the upper surface of the supporting plate (412). 5), two limiting cylinders (416) are symmetrically arranged on the U-shaped block (415), a ball (417) is movably arranged in the limiting cylinder (416), a return spring (418) is arranged in the limiting cylinder (416), one end of the return spring (418) is fixedly connected to the inner wall of the limiting cylinder (416), and the other end of the return spring (418) is connected to the ball (417), and a needle placement groove (419) is opened on the top of the movable needle seat (414).

2. A guide needle positioning device for internal fistula puncture according to claim 1, characterized in that: The measuring component (42) comprises a measuring housing (421), a measuring transverse axis (422) is coaxially fixedly connected inside the measuring housing (421), a measuring cylinder (423) is rotatably sleeved on the measuring transverse axis (422), a coil spring (424) is arranged inside the measuring cylinder (423), one end of the coil spring (424) is fixedly connected to the inner wall of the measuring cylinder (423), and the other end of the coil spring (424) is fixedly connected to the shaft wall of the measuring transverse axis (422). A measuring tape (425) is arranged in the measuring housing (421), the measuring tape (425) is wound on the measuring cylinder (423), one end of the measuring tape (425) is fixedly connected to the outer wall of the measuring cylinder (423), the other end of the measuring tape (425) passes through the measuring housing (421) and extends to the outside and is fixedly connected to the seat wall of the movable needle seat (414), and a measuring pointer (426) is fixedly connected to the upper surface of the support plate (412).

3. A guide needle positioning device for internal fistula puncture according to claim 2, characterized in that: The needle seat limiting component (43) comprises a receiving groove (431), wherein the receiving groove (431) is provided at the bottom of the movable needle seat (414), wherein a rolling ball (432) is movably arranged in the receiving groove (431), wherein a buffer spring (433) is arranged in the receiving groove (431), wherein the top end of the buffer spring (433) is fixedly connected to the inner wall of the receiving groove (431), wherein the bottom end of the buffer spring (433) abuts against the ball wall of the rolling ball (432), and the ball outer wall of the rolling ball (432) abuts against the top of the movable needle seat (414).

4. A guide needle positioning device for internal fistula puncture according to claim 3, characterized in that: The needle insertion fixing unit (5) comprises a needle pressing component (51), a position limiting component (52) is arranged on the needle pressing component (51), the needle pressing component (51) is arranged on the needle insertion limiting component (41), and the position limiting component (52) is arranged on the needle pressing component (51).

5. A guide needle positioning device for internal fistula puncture according to claim 4, characterized in that: The needle pressing component (51) comprises an arc-shaped pressing block (511), the arc-shaped groove of the arc-shaped pressing block (511) is arranged opposite to the needle placing groove (419), the top of the movable needle seat (414) is fixedly connected with a vertical tube (512), the tube wall of the vertical tube (512) is provided with a vertical guide groove (513) and a spiral guide groove (514), the top end of the vertical guide groove (513) is connected with one end of the spiral guide groove (514), a threaded sleeve (515) and a vertical threaded rod (516) are movably arranged in the vertical tube (512), and the vertical threaded rod (516) is provided with a vertical guide groove (513). The bottom end of the vertical threaded rod (516) is rotatably connected to the top of the movable needle seat (414), and the top of the vertical threaded rod (516) is extended to the top of the vertical tube (512) and is fixedly connected to the needle pressing handle (517). The threaded sleeve (515) is threadedly sleeved on the vertical threaded rod (516), and a rotating ring (518) is rotatably sleeved on the threaded sleeve (515). A connecting cross bar (519) is fixedly connected to the outer wall of the rotating ring (518), and one end of the connecting cross bar (519) passes through the vertical guide groove (513) and is fixedly connected to the block wall of the arc-shaped clamping block (511).

6. A guide needle positioning device for internal fistula puncture according to claim 5, characterized in that: The position limiting component (52) includes a fixed shaft (521), the bottom end of the fixed shaft (521) is fixedly connected to the top of the movable needle seat (414), one end of the fixed shaft (521) is rotatably sleeved with a gear (522), a long notch (523) is opened on the wall of the vertical tube (512), one side of the gear (522) is provided with an adjustment rack (524), and the other side of the gear (522) is provided with a limiting rack (525), the tooth grooves of the limiting rack (525) and the adjustment rack (524) are in opposite directions, and the limiting rack (525) and the adjusting rack (524) are meshed with the gear (522), one end of the adjusting rack (524) passes through the long slot (523) and is fixedly connected to the top of the threaded sleeve (515), the movable needle seat (414) is provided with a limiting hole (526) adapted to the limiting rack (525), the movable needle seat (414) is provided with a long hole (527), the limiting rack (525) is longitudinally penetrated and slidably connected with a T-shaped slide rail (528), and the T-shaped slide rail (528) is fixedly connected to the seat wall of the movable needle seat (414).

7. A guide needle positioning device for internal fistula puncture according to claim 1, characterized in that: An adjusting shaft (6) is fixedly connected to the support plate (412), and the adjusting shaft (6) is coaxially arranged with the rotation point of the support plate (412) and the connecting frame (411), and a worm gear (7) is fixedly sleeved on one end of the adjusting shaft (6).

8. A guide needle positioning device for internal fistula puncture according to claim 7, characterized in that: A worm (8) is longitudinally penetrated through the wall of the connecting frame (411) and is rotatably connected thereto. The worm (8) is meshed with the worm wheel (7), and a limiting handle (9) is fixedly connected to the top end of the worm (8).

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