Traction structure and adjustable bent catheter

Abstract

The utility model relates to the field of medical instruments, in particular to a traction structure which comprises a worm coaxially arranged in an adjusting cylinder, the worm is sequentially provided with a forward thread and a reverse thread in the axial direction, and a driven part matched with the forward thread and the reverse thread is further installed in the adjusting cylinder. And the worm is in worm and gear transmission or sliding fit with the two driven parts through the forward threads and the reverse threads, so that the two driven parts generate opposite movement actions, and drawing wires used for drawing the guide pipe are arranged on the two driven parts. According to the utility model, the catheter can be quickly and accurately bent by two hands, so that the operation time is greatly shortened.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, in particular to a traction structure and an adjustable curved catheter. Background Art

[0002] The adjustable curved catheter is a basic medical device used in interventional surgery to establish a channel between the patient's lesion location and the external operating end. By fixing two guide wires on both sides of the catheter tip, the curvature of the catheter can be adjusted by pulling the two guide wires. After the catheter tip is bent, the tip can point to the lesion location, which is convenient for surgical operations on curved paths in the cavity during interventional surgery. It can help patients establish vascular access more quickly, such as the selection of the renal artery, superior mesenteric artery, celiac trunk, and carotid artery. It can also be used for vascular thrombectomy, venous filter recovery, and the delivery and release of occluders.

[0003] Adjustable bend catheters provide the function of changing the curvature of the catheter tip during interventional surgery, but also increase the difficulty of surgical operations. As described in the patent number "CN216090610U", the existing adjustable bend catheters require the guidewire and various pipelines to be inserted into the working channel from the side in a bent manner. When adjusting the bend of the catheter, it is difficult to control two or more guidewires with the other hand while holding the handle with one hand. It is often necessary to fix the handle and then use both hands to pull the guidewire to bend the catheter. The controllability is poor and the bending accuracy is low, which increases the operation time and potential risks, and therefore needs to be solved urgently. Utility Model Content

[0004] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a traction structure and an adjustable bending catheter. The utility model can realize rapid and accurate bending of the catheter by both hands, greatly shortening the operation time.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A traction structure comprises a worm coaxially arranged in an adjusting cylinder, wherein a forward thread and a reverse thread are sequentially provided on the worm along the axial direction, and a driven component respectively matched with the forward thread and the reverse thread is also installed in the adjusting cylinder; the worm is driven or slidably matched with two driven components, a worm gear, through the forward thread and the reverse thread, so that the two driven components produce opposite movements, and wire drawing for pulling a catheter is arranged on both sets of driven components.

[0007] As a further solution of the utility model: the driven component is a worm wheel, the end of the drawing wire is fixed on the worm wheel, and the worm gear cooperates with the two worm wheels through forward threads and reverse threads to form a worm gear, driving the two worm wheels to rotate in opposite directions to respectively reel in or release the corresponding drawing wire.

[0008] As a further solution of the utility model: the driven component is a slider, and two groups of symmetrically arranged positioning grooves are opened on the wall of the adjusting cylinder along the axial direction. One end of the slider slides with the screw groove of the forward thread or the reverse thread, and the other end of the slider slides with the positioning groove; the end of the drawing wire is fixed on the slider, and the two sliders are driven by the worm to slide in opposite directions along the positioning groove, while producing a linear traction or release action on the drawing wire.

[0009] An adjustable curved catheter comprises a traction structure as described above, wherein an adjusting tube is arranged at the tail end of a handle, a first working hole for the catheter to pass through is axially opened at the head end of the handle, two sets of wire drawing ends away from the driven component are connected and fixed to the catheter body, and the connection points are symmetrically arranged.

[0010] As a further solution of the utility model: a rotating head coaxially rotating with the adjusting cylinder is arranged at the tail end of the handle, and the worm in the adjusting cylinder is coaxially fixed with the rotating head.

[0011] As a further solution of the utility model: a locking assembly is provided on the rotating head and / or the adjusting cylinder to position the rotation angle of the rotating head.

[0012] As a further solution of the utility model: a second working hole is opened on the side surface of the first end of the handle for the cable to pass through.

[0013] As a further solution of the utility model: a guide assembly is arranged in the handle to guide the two drawing wires to pass through the handle according to a set route.

[0014] As a further solution of the utility model: the outer ring of the handle and / or the rotating head is provided with anti-slip grooves for increasing the gripping friction.

[0015] As a further solution of the utility model: an alloy layer is provided on the surface of the screw groove of the worm and the forward thread and the reverse thread.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The utility model can drive two sets of driven components to pull or release two sets of drawing wires with opposite movements by rotating the worm, so as to adjust the curvature of the catheter through the two sets of drawing wires. The catheter can be quickly and accurately adjusted by both hands, which greatly shortens the operation time.

[0018] 2. The driven component of the utility model can be selectively set as a worm gear or a slider. The cooperation of the worm gear and the worm can make the two sets of worm gears rotate in opposite directions to reel in or release the two sets of drawing wires. The sliding cooperation of the slider and the thread groove can pull or release the two sets of drawing wires, thereby realizing the rapid bending of the catheter.

[0019] 3. The utility model fixes the catheter and the rotating head coaxially. During surgery, one hand holds the handle and the other hand holds the rotating head. The catheter can be bent by rotating the rotating head. After adjusting to the set curvature, the catheter curvature can be positioned by locking the rotating head through the locking assembly to prevent the catheter position from changing due to body pressure or malfunction during operation. While improving operational flexibility, it also improves the stability of the adjustable bend catheter and reduces production costs.

[0020] 4. The utility model improves the maneuverability, accuracy and reliability of the catheter by improving the design of the control mechanism. A high-proportional deceleration can be achieved through the worm drive, so that a tiny rotation can be converted into a fine movement of the catheter tip. The worm drive has a relatively smooth action characteristic, which helps to reduce vibration and instability during operation, provides a smoother sense of control, allows doctors to adjust the position and shape of the catheter more quickly, improves the accuracy and safety of the operation, reduces the difficulty of the doctor's operation and the risk to the patient, thereby improving the overall diagnosis and treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the adjustable curved conduit in the utility model.

[0022] Figure 2 It is a structural schematic diagram of the first embodiment of the traction structure in the utility model.

[0023] Figure 3 It is a structural schematic diagram of the second embodiment of the traction structure in the utility model.

[0024] Figure 4 It is a structural schematic diagram of the first embodiment of the locking assembly in the utility model.

[0025] Figure 5 It is a structural schematic diagram of the second embodiment of the locking assembly in the utility model.

[0026] Figure 6 It is a structural schematic diagram of the third embodiment of the locking assembly in the utility model.

[0027] Figure 7 It is a structural schematic diagram of the fourth embodiment of the locking assembly in the utility model.

[0028] Figure 8 It is a structural schematic diagram of the fifth embodiment of the locking assembly in the utility model.

[0029] In the figure:

[0030] 1. Rotating head; 2. Handle; 21. Adjusting cylinder; 22. Catheter;

[0031] 23. First working hole; 24. Second working hole; 25. Anti-slip pattern;

[0032] 31. Worm; 311. Forward thread; 312. Reverse thread;

[0033] 32. Wire drawing; 33. Worm gear; 34. Slider. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] See also Figures 1 to 8 In an embodiment of the utility model, a traction structure and an adjustable bend catheter include a handle 2, which is in the shape of a long cylinder. A first working hole 23 is axially opened at the head end of the handle 2. A catheter 22 is coaxially fixed in the handle 2, and its working section passes through the first working hole 23 and extends to the outside of the handle 2.

[0036] The main body of the catheter 22 is generally a tubular structure made of multiple layers of material. The inner layer may be flexible plastic or rubber, and the outer layer may be braided metal or polymer to provide strength and protection. The interior of the catheter 22 is hollow to allow medical devices, interventional needles or optical fibers to pass through.

[0037] The tip of the catheter 22 extends outside the handle 2. A set of outer sleeves are usually arranged outside the catheter 22. Two sets of wires 32 are symmetrically connected to both sides of the tip of the catheter 22. There is an annular gap between the outer sleeve and the catheter 22 to allow free movement of the wires 32. In some designs, the catheter 22 and the outer sleeve can also be connected by sliding to reduce friction during bending.

[0038] The outer sleeve is the outer structure surrounding the catheter 22, usually made of a hard material to increase the overall rigidity of the catheter and ensure that the force of the wire drawing 32 can be accurately converted into the movement of the tip of the catheter 22. The design of the outer sleeve allows it to have a certain flexibility so that the catheter 22 can easily bend and navigate through blood vessels or other body cavities.

[0039] The wire drawing 32 can be made of stainless steel or other high-strength, corrosion-resistant materials. A traction mechanism is provided in the handle 2 to pull the two sets of wire drawing 32 to move, and the two sets of wire drawing 32 can drive the tip of the catheter 22 to generate a bending action.

[0040] The adjusting cylinder 21 is a part of the handle 2 and is arranged at the tail end of the handle 2, that is, the end away from the tip of the catheter 22. The traction structure includes a worm 31 coaxially arranged in the adjusting cylinder 21, and the upper edge of the worm 31 is axially provided with a forward thread 311 and a reverse thread 312 that are symmetrical in front and back.

[0041] like Figure 2 As shown, in one embodiment, two groups of worm gears 33 are arranged in the adjusting cylinder 21, and the two groups of worm gears 33 respectively form a worm gear transmission with the positive thread 311 and the reverse thread 312 of the worm 31, and the two groups of worm gears 33 are arranged on both sides of the worm 31. When the worm 31 rotates, the two groups of worm gears 33 are driven to rotate in opposite directions. The end of the wire drawing 32 away from the catheter 22 can be fixed on the axle of the worm gear 33, and the wire drawing 32 can be wound or released when the worm gear 33 rotates. When one group of wire drawing 32 is wound, the other group of wire drawing 32 is released. At this time, the catheter 22 is pulled by the wire drawing 32 and bends in the direction of the wound wire drawing 32. When the catheter 22 is reset, the two groups of wire drawing 32 will be driven to reset synchronously under the action of its own elasticity. Figure 2 This is a simplified structural diagram of the assembly. During actual assembly, the dimensions will be adaptively adjusted according to different working conditions.

[0042] like Figure 3 As shown, in another embodiment, two groups of sliders 34 are arranged in the adjusting cylinder 21, and two groups of symmetrically arranged positioning grooves are opened on the cylinder wall of the adjusting cylinder 21 along the axial direction. Sliders 34 are slidably installed in the two groups of positioning grooves. While the sliders 34 slide with the positioning grooves, they also slide with the screw grooves of the forward thread 311 and the reverse thread 312. When the worm 31 rotates, the two sliders 34 are driven to slide along the corresponding screw grooves. While the sliders 34 slide along the screw grooves, they slide along the positioning grooves. The end of the wire drawing 32 away from the catheter 22 is fixed on the slider 34. When the worm 31 drives the two groups of sliders 34 to move toward or away from each other, the two groups of wire drawing 32 are pulled or released. While one group of wire drawing 32 is pulled away from the catheter 22, the other group of wire drawing 32 is released toward the catheter 22. At this time, the catheter 22 is pulled by the wire drawing 32 and bends in the direction of the wound wire drawing 32. When the catheter 22 is reset, the two groups of wire drawing 32 will be driven to reset synchronously under the action of its own elasticity.

[0043] The rotating head 1 can be coaxially mounted outside the tail end of the handle 2, and the rotating head 1 is coaxially rotated with the adjustment cylinder 21, and the worm 31 is coaxially fixed with the rotating head 1. When the operator (usually a doctor or medical professional) holds the handle 2 and rotates the rotating head 1, the worm 31 is driven to rotate, and the traction structure applies force to the wire drawing 32, and the wire drawing 32 converts this force into the movement of the tip of the catheter 22, causing the tip of the catheter 22 to bend or straighten, and the tip of the catheter changes its shape due to the pulling or relaxation of the wire drawing 32. The degree of bending of the tip of the catheter 22 depends on the displacement of the wire drawing 32, allowing the direction of the catheter 22 to be finely controlled. The outer sleeve provides protection for the catheter 22 and maintains the integrity of the overall structure so that the catheter 22 can pass through the blood vessels or other body cavities smoothly. The outer sleeve also gives the catheter 22 sufficient propulsion force so that it can resist the pressure and friction inside the body. Finally, the doctor can adjust the control according to the real-time image feedback and navigate the catheter 22 more accurately.

[0044] The forward thread 311 and the reverse thread 312 on the worm 31 balance the axial force through two tooth rows with opposite helix angles, so the axial and radial forces can be well balanced, while improving the load-bearing capacity and reducing noise. This arrangement allows the catheter 22 to be fine-tuned in two directions, rather than just bending in a single direction, which increases flexibility during surgery. And the design of the two sets of helical teeth can ensure that they fit the worm gear 33 without gaps, achieving smooth and accurate power transmission. At the same time, in general, the internal space of the catheter is limited, so the worm 31 and its related transmission mechanism must be designed to be compact and efficient. The present application transmits bidirectional motion through a worm 31, reducing space occupancy and design complexity, which is critical for efficient use of the internal space of precision medical devices such as the catheter 22.

[0045] In order to increase the friction when holding, the outer ring of the handle 2 and the rotating head 1 can be provided with anti-slip grooves to increase the friction when holding. Multiple sets of guide components can be installed in the handle 2 to guide the two sets of wires 32 to pass through the handle 2 according to the set route. The guide component can be a guide tube, and the wires pass through the lumen of the guide tube. The side of the head end of the handle 2 has a second working hole 24 for the cable to pass through, so as to avoid position interference between the cable and the catheter 22.

[0046] The rotation angle of the rotating head 1 corresponds to the displacement distance of the tip of the catheter 22. Taking the worm gear transmission as an example, the displacement distance of the tip of the catheter 22 is d=θ / T×P×360°.

[0047] Wherein, θ represents the rotation angle of the rotating head 1;

[0048] T represents the transmission ratio between the worm 31 and the worm wheel 33;

[0049] P represents the pitch of the thread on the worm 31 .

[0050] In order to further reduce the friction of the transmission, the worm 31 and the threads on the worm 31 are hardened, nitrided, carburized or plated (such as nickel plating) to enhance the surface wear resistance and reduce friction. In order to further optimize the performance of the transmission, the thread profile on the worm 31 is an involute tooth profile, because it has a constant linear speed ratio during rotation, which can achieve a smoother transmission. The shape of the involute can make the contact line of the worm wheel 33 parallel to the axis, helping to disperse the load and maintain the balance of axial and radial forces. Both the worm wheel 33 and the worm 31 need to be miniaturized to adapt to the size restrictions of the catheter 22, and sufficient accuracy and strength need to be guaranteed to meet the requirements of the operation of the catheter 22. The actual size range will depend on the specific application and design requirements of the catheter 22, such as the diameter of the catheter 22, the expected rotation range and the acceptable torque. In fields such as endoscopic technology, vascular intervention surgery or minimally invasive surgery. The tooth shape is usually custom-designed, usually an involute tooth shape or other tooth shape designed specifically for miniaturized transmission equipment. The pitch should be small enough to adapt to the inner diameter, usually a few millimeters or even smaller. The pitch (i.e., the helix angle) should match the number of teeth of the worm wheel 33 and the diameter of the worm 31 to achieve efficient power transmission. The tooth width is the width of the gear, which is usually narrow to fit into the small space of the catheter 22. The tooth height should be small enough to fit into the size restrictions of the catheter 22, but large enough to ensure the strength and durability of the gear. The diameter of the worm 31 must be small enough so that it can be integrated into the handle 2, while also ensuring that it can withstand the stress generated by operation.

[0051] The handle 2 and / or the rotating head 1 is also provided with a locking assembly, and after the rotating head 1 drives the worm 31 to rotate to a set angle, the worm 31 is locked by the locking assembly so as to be coaxially fixed with the handle 2. In interventional surgery, the locking assembly ensures that the catheter 22 can be firmly locked in place after being adjusted to a desired bending angle, thereby avoiding displacement or deformation during use.

[0052] In some embodiments, see Figure 4The locking assembly can be locked by a spring pin, and a plurality of small holes or grooves can be provided at the joint of the handle 2 and the rotating head 1 along the circumferential direction. The spring pin is a pin with a spring, which can move into or out of the locking position when the internal spring contracts. The spring provides pressure to the spring pin so that it can enter the locking position or exit during operation. The groove or hole is provided on the adjustable part of the handle 2, which is used to correspond to the spring pin to fix the position of the rotating head 1. It may also include an operating rod or button for manually controlling the extension and contraction of the spring pin, thereby unlocking or locking the catheter 22. When the catheter 22 is adjusted to the desired angle or position, the operating rod or button is released, and the elastic force of the spring pushes the spring pin into the groove or hole on the handle 2, so that the spring pin is stuck in place, thereby locking the position of the catheter 22; when the position of the catheter 22 needs to be adjusted, the operator presses the operating rod or button, which compresses the spring and pulls out the spring pin, releasing the catheter 22 from the groove or hole, allowing the operator to rotate the rotating head 1 to readjust the curvature of the catheter 22.

[0053] In some embodiments, see Figure 5 , the locking assembly can adopt wedge locking, and one or more movable wedge blocks are designed at the joint of the handle 2 and the rotating head 1. The wedge block can slide in one direction to be embedded in the corresponding recesses on the rotating head 1 and the handle 2. When the wedge block is pushed into the recess, the rotating head 1 stops rotating and the catheter 22 is locked. In this embodiment, the wedge block is usually an inclined block-shaped element, which can be radially embedded in the recesses on the handle 2 and the rotating head 1; the pushing mechanism of the wedge block is manual or mechanical, such as a knob, a lever or a screw mechanism, which is used to push the wedge block to the locking position, and the rotating head 1 is axially locked and can no longer rotate. When wedge locking is not required, the wedge block is reset to the initial position so that the catheter 22 can adjust its position again. In order to achieve resetting, a spring or other mechanism can be added to provide the wedge block with a resetting thrust.

[0054] In some embodiments, see Figure 6, the locking assembly can be threadedly locked, and the handle 2 and the rotating head 1 can be processed with external threads and internal threads respectively. The rotating head 1 is locked and fixed by the threaded cooperation of the handle 2 and the rotating head 1 to achieve the locking effect of the rotating head 1. This design can provide subtle adjustments, because each rotation of the rotating head 1 corresponds to a fixed distance or angle adjustment. In this embodiment, the rotating head 1 can be a knob, a handwheel or other rotating device, allowing the operator to manually rotate the external threaded part; a seal is installed between the rotating head 1 and the handle 2 to maintain the sterile environment inside the handle 2; a sealing ring can be optionally installed to improve the sealing of the entire system. During operation, when the operator turns the rotating head, due to the engagement of the internal and external threads, the linear movement of the rotating head during rotation can achieve precise bending of the catheter 22. When tightening, the external threaded part gradually moves toward the internal threaded part until the desired locking point is reached. This structure can provide a strong and adjustable locking mechanism, allowing the catheter 22 to be fixed at different angles or positions. When rotating to unlock, the external threaded portion is rotated in the opposite direction and retreats along the internal thread, thereby releasing the lock and allowing the catheter 22 to be repositioned.

[0055] In some embodiments, see Figure 7 The locking assembly can be interlocked with a spherical convex point and a groove, that is, a series of grooves are designed at the joint of the handle 2, and a spring with a spherical convex point is mounted on the movable part. When adjusted to the corresponding position, the spherical convex point is pushed into the nearest groove by the spring force to achieve locking. Among them, the spherical convex point is usually a small spherical structure, which can be made of metal or hard plastic material, and can be embedded in the corresponding groove. The groove is set in the adjustable part of the catheter. Usually, multiple groups of concave points can be arranged along the axial direction of the handle 2 to receive the spherical convex point. Each spherical convex point is usually equipped with a small spring behind it to push the spherical convex point outward so that it can be stably embedded in the groove; the spherical convex point can be pushed out of the groove by adding an elastic button to contact the locking of the catheter 22. When the catheter 22 needs to be fixed at a specific position or angle, the spherical convex point extends into the groove under the action of the spring, thereby locking the position of the catheter 22. This connection method allows multi-point positioning and can achieve more complex spatial positioning.

[0056] In some embodiments, see Figure 8The locking assembly can be locked by a rotary paddle. A paddle groove is provided in the axial direction of the inner ring of the rotating head 1 for the paddle on the handle 2 to be assembled into the groove body. The groove body of the paddle groove is opened radially along the rotating head 1. The paddle is an elastic paddle, which can float elastically in the paddle groove after being compressed. The number of paddles is unlimited. A guide groove is provided in the circumferential direction of the outer ring of the handle 2 for the paddle 11 to be clamped and positioned. When the rotating head 1 rotates, the paddle slides along the guide groove. Wave-shaped limiting bends are evenly spaced in the circumferential direction in the guide groove, and grooves are formed between adjacent limiting bends for the paddle to pass through. When the paddle passes through the limiting bend, it abuts against the paddle and pushes the paddle into the paddle groove to realize the interval rotation of the rotating head 1 and control the rotation angle. The rotary paddle locking is usually used to realize a quick locking and unlocking mechanism, and is suitable for adjustable curved conduits that need to frequently adjust the position or angle.

[0057] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0058] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

Claims

1. A traction structure, characterized in that: The invention comprises a worm (31) coaxially arranged in an adjusting cylinder (21), wherein a positive thread (311) and a reverse thread (312) are sequentially provided on the worm (31) along the axial direction, and a driven component respectively matched with the positive thread (311) and the reverse thread (312) is also installed in the adjusting cylinder (21); the worm (31) is worm-gear-driven or slidably matched with the two driven components through the positive thread (311) and the reverse thread (312), so that the two driven components produce opposite motions, and a drawing wire (32) for pulling the catheter (22) is arranged on both sets of driven components.

2. A traction structure according to claim 1, characterized in that: The driven component is a worm wheel (33), the end of the wire drawing (32) is fixed on the worm wheel (33), and the worm (31) is respectively matched with the two worm wheels (33) through a forward thread (311) and a reverse thread (312) to form a worm gear, driving the two worm wheels (33) to rotate in opposite directions to respectively reel in or release the corresponding wire drawing (32).

3. A traction structure according to claim 1, characterized in that: The driven component is a slider (34). Two groups of symmetrically arranged positioning grooves are opened on the wall of the adjusting cylinder (21) along the axial direction. One end of the slider (34) is slidably matched with the screw groove of the forward thread (311) or the reverse thread (312), and the other end of the slider (34) is slidably matched with the positioning groove. The end of the wire drawing (32) is fixed on the slider (34). The two sliders (34) are driven by the worm (31) to slide along the positioning groove in opposite directions, and at the same time, a linear pulling or releasing action is generated on the wire drawing (32).

4. An adjustable curved conduit, characterized in that: It comprises a traction structure as described in any one of claims 1 to 3, wherein the adjustment cylinder (21) is arranged at the rear end of the handle (2), the head end of the handle (2) is axially provided with a first working hole (23) for the catheter (22) to pass through, and the ends of the two sets of wire drawing (32) away from the driven components are connected and fixed to the tube body of the catheter (22), and the connection points are symmetrically arranged.

5. The adjustable curved conduit according to claim 4, characterized in that: A rotating head (1) coaxially rotating with the adjusting cylinder (21) is arranged at the tail end of the handle (2), and a worm (31) in the adjusting cylinder (21) is coaxially fixed with the rotating head (1).

6. The adjustable curved conduit according to claim 5, characterized in that: A locking assembly is provided on the rotating head (1) and / or the adjusting cylinder (21) to position the rotation angle of the rotating head (1).

7. The adjustable curved conduit according to claim 4, characterized in that: A second working hole (24) is provided on the side surface of the head end of the handle (2) for the cable to pass through.

8. The adjustable curved conduit according to claim 4, characterized in that: A guide assembly is arranged inside the handle (2) to guide the two drawing wires (32) to pass through the handle (2) along a set route.

9. The adjustable curved conduit according to claim 4, characterized in that: The outer ring of the handle (2) and / or the rotating head (1) is provided with anti-slip grooves (25) for increasing the gripping friction.

10. The adjustable curved conduit according to claim 4, characterized in that: The screw groove surfaces of the worm (31) and the forward thread (311) and the reverse thread (312) are provided with an alloy layer.

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