Adjustable handle and microcatheter

Abstract

The utility model discloses an adjustable handle and a micro catheter. The adjustable handle is used for being connected with a catheter of the micro catheter and comprises a fixed handle, a rotating handle, a wire winding shaft and a traction wire. The rotating handle and the fixed handle are rotationally connected to form a cavity, and at least part of the rotating handle is located in the cavity. At least one wire winding shaft is fixedly connected with the rotating handle located in the cavity. The traction wire is configured to be in traction connection with the wire winding shaft and the catheter located outside the cavity, and the section, close to the wire winding shaft, of the traction wire is wound around the wire winding shaft. When the rotating handle rotates relative to the fixed handle, the wire winding shaft moves along with the rotating handle, and at the moment, the length of the traction wire can be increased or decreased, so that the distance between the contact point, connected with the traction wire, of the catheter and the wire winding shaft is controlled. According to the technical scheme, the control accuracy of the paying-off length of the micro catheter can be improved, and therefore the control accuracy of the angle of the head end of the micro catheter is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to an adjustable handle and a micro-catheter. Background Art

[0002] Microcatheter refers to a reinforced catheter with a very small diameter, and there is no strict size definition. Microcatheters are used for guidewire support or exchange, by delivering embolic agents or stents to lesions. The small structure makes it very suitable for moving in human blood vessels, so it is increasingly used in minimally invasive interventional surgery. Existing adjustable curved handle structures such as Figure 1 As shown, the traction line 4 is wound on the turntable 8, and the diameter of the turntable 8 is relatively large. One rotation will result in a longer line release, and the length of the line release cannot be accurately controlled, thereby failing to accurately control the angle of the head end. Utility Model Content

[0003] The main purpose of the utility model is to provide an adjustable handle, aiming to improve the control accuracy of the length of the microcatheter's release line, thereby improving the accuracy of controlling the angle of the microcatheter's head end.

[0004] To achieve the above object, the utility model provides an adjustable handle for connecting with a catheter of a microcatheter, comprising:

[0005] Fixed handle;

[0006] A rotating handle, the rotating handle is rotatably connected to the fixed handle and forms a cavity, and at least a portion of the rotating handle is located in the cavity;

[0007] A wire winding shaft, at least one of which is fixedly connected to the rotating handle located in the cavity; and

[0008] A traction wire, the traction wire is configured to tractionally connect the wire winding shaft and the catheter located outside the cavity, and a section of the traction wire close to the wire winding shaft is wound around the wire winding shaft;

[0009] When the rotating handle rotates relative to the fixed handle, the wire winding shaft moves along with the rotating handle. At this time, the length of the traction wire will increase or decrease to control the distance from the contact point where the catheter is connected to the traction wire to the wire winding shaft.

[0010] It can be further configured that a positioning groove is provided on the wire winding shaft, the positioning groove is spirally arranged on the wire winding shaft, and the traction wire is located in the positioning groove and is attached to the wire winding shaft.

[0011] It can be further configured that two winding shafts are provided, the parts of the two winding shafts located in the cavity are fixedly connected to the rotating handle, the winding direction of the traction wire of one winding shaft is clockwise, and the winding direction of the traction wire of the other winding shaft is counterclockwise.

[0012] It can be further configured that the cavity communicates the inner space of the fixed handle and the inner space of the rotating handle, and the rotating handle includes:

[0013] a rotating portion, the rotating portion being located outside the cavity; and

[0014] A mounting plate, part of which is located inside the cavity and is rotatably connected to the fixed handle, part of which is connected to the mounting plate, and the wire winding shaft is disposed on a side of the mounting plate facing the catheter;

[0015] Wherein, the mounting disk is configured to transmit the kinetic energy of the rotating part to change the length of the traction wire on the winding shaft.

[0016] It can be further configured that the adjustable handle further includes a locking assembly, and the locking assembly includes:

[0017] A locking member capable of being attached to or away from the mounting plate;

[0018] A first clamping portion is configured on one side of the mounting plate close to the locking member;

[0019] The locking member is formed with a second clamping portion corresponding to the first clamping portion, and the first clamping portion and the second clamping portion are tightly locked.

[0020] It can be further configured that the locking member has a limiting portion and a locking portion that can approach or move away from the mounting plate, the limiting portion is configured to limit the movable direction of the locking portion, and the locking assembly further includes:

[0021] An elastic member, the elastic member comprising a movable end attached to the locking portion, a fixed end relatively stationary to the fixed handle, and a telescopic section disposed between the movable end and the fixed end and configured to provide elastic force and change its own length; and

[0022] A limit baffle, the limit baffle is fixedly connected to the fixed handle, the limit baffle has a limit hole penetrating through the limit baffle and communicating with the cavity, and the limit hole is configured to allow the limit portion to movably pass through;

[0023] The telescopic section is sleeved on the limiting portion, and the fixed end is in contact with and fixed to the limiting baffle. When the length of the telescopic section itself is shortened or extended, the limiting portion moves together with the locking portion.

[0024] It can be further configured that the limiting portion also has a pin hole, and the locking assembly also includes a limiting pin, the limiting pin passes through the pin hole and is fixed to the limiting portion, and the limiting pin is configured to limit the maximum length that the telescopic section can extend.

[0025] It can be further configured that the adjustable handle also includes a positioning ring, the positioning ring has a connecting portion fixed to the wire winding shaft, the connecting portion is formed with a wire threading hole penetrating itself and communicating with the cavity, the traction wire passes through the wire threading hole and is connected to the catheter, and the wire threading hole is configured to limit the torsion angle of the traction wire in the cavity.

[0026] A microcatheter comprises the adjustable handle described in any one of the above items and the catheter connected to the adjustable handle, wherein the catheter comprises an outer layer, a braided layer, and an inner layer arranged in sequence from the outside to the inside, wherein the hardness of the proximal end of the outer layer is greater than the hardness of the distal end.

[0027] It can be further configured that the catheter also includes a wire wrapping tube, the wire wrapping tube is arranged between the braided layer and the outer layer, and the wire wrapping tube is configured to limit the direction of the traction wire.

[0028] The technical solution of the utility model is to wind the traction wire on the wire winding shaft, and rotate the handle relative to the fixed handle so that the wire winding shaft rotates together with the rotating handle. During this process, the wire winding shaft changes the length of the straight segment of the traction wire, so that the distance from the contact point where the catheter and the traction wire are connected to the wire winding shaft can be more accurately adjusted, thereby improving the control accuracy of the length of the microcatheter's pay-off, thereby improving the accuracy of controlling the angle of the head end of the microcatheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 A handle in the prior art;

[0031] Figure 2 This is an overall view of the microcatheter;

[0032] Figure 3 It is a cross-sectional view of an embodiment of the adjustable handle of the utility model;

[0033] Figure 4 It is a cross-sectional view of the wire winding shaft in the adjustable handle of the utility model;

[0034] Figure 5 This is a schematic diagram of the structure of the adjustable handle of the utility model, in which the spiral directions of the two winding shafts are opposite;

[0035] Figure 6 This is a schematic diagram of the structure of the mounting plate in the adjustable handle of the utility model, wherein the left side is a top view and the right side is a side view;

[0036] Figure 7 This is a schematic diagram of the structure of the locking member in the adjustable handle of the utility model;

[0037] Figure 8 for Figure 3 The enlarged view of point A in the middle;

[0038] Fig. 9 This is a schematic diagram of the installation structure of the positioning ring in the adjustable handle of the utility model;

[0039] Fig.10 This is a schematic diagram of the structure of the positioning ring in the adjustable handle of the utility model;

[0040] Fig.11 It is a schematic diagram of the structure of the micro-catheter of the utility model;

[0041] Fig.12 It is a cross-sectional view of the catheter in the micro-catheter of the utility model;

[0042] Fig.13 The utility model is a schematic diagram of the structure of the microcatheter embodying three different shapes of the wire-wrapped tube.

[0043] Description of Figure Numbers:

[0044] 100. Microcatheter;

[0045] 1. Fixed handle; 11. Cavity;

[0046] 2. Rotating handle; 21. Rotating portion; 22. Mounting plate; 23. First clamping portion;

[0047] 3. Wire winding shaft; 31. Positioning groove;

[0048] 4. Traction wire;

[0049] 5. Locking assembly;

[0050] 51, locking member; 511, locking portion; 512, second clamping portion; 513, limiting portion; 514, pin hole;

[0051] 52, elastic member; 521, mobile end; 522, telescopic section; 523, fixed end;

[0052] 53. Limit baffle; 531. Limit hole;

[0053] 54. Limit pin;

[0054] 6. Positioning ring; 61. Connecting part; 62. Threading hole;

[0055] 7. catheter; 71. outer layer; 72. braided layer; 73. inner layer; 74. wire-wrapped tube;

[0056] 8. Rotating shaft.

[0057] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0058] 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 of 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.

[0059] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0060] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0061] like Figures 2 to 10 The utility model provides an adjustable handle for connecting with the catheter 7 of the micro-catheter 100. Figure 2 and Figure 3The adjustable handle includes a fixed handle 1, a rotating handle 2, a wire winding shaft 3 and a traction wire 4. The rotating handle 2 is rotatably connected to the fixed handle 1 and forms a cavity 11, and at least part of the rotating handle 2 is located in the cavity 11. At least one wire winding shaft 3 is fixedly connected to the rotating handle 2 located in the cavity 11. The traction wire 4 is configured to tractionally connect the wire winding shaft 3 and the catheter 7 located outside the cavity 11, and a section of the traction wire 4 close to the wire winding shaft 3 is wound around the wire winding shaft 3. When the rotating handle 2 rotates relative to the fixed handle 1, the wire winding shaft 3 moves with the rotating handle 2. At this time, the length of the traction wire 4 will increase or decrease to control the distance from the contact point where the catheter 7 is connected to the traction wire 4 to the wire winding shaft 3.

[0062] The rotating handle 2 can be axially rotated 360 degrees reciprocatingly relative to the fixed handle 1, and the rotating handle 2 can be a disc-shaped structure. The traction wire 4 is made of metal materials such as stainless steel and nickel titanium, preferably nickel titanium wire, which can have good shape retention when wound on the wire winding shaft 3. In other embodiments, the shape of the wire can be fixed according to the positioning groove 31 on the wire winding shaft 3 before being wound on the wire winding shaft 3. The advantage is that the traction wire 4 can be smoothly returned to the positioning groove 31 when the wire is reeled in after being released.

[0063] The traction wire 4 can be round wire or flat wire. The diameter of the round wire is selected between 0.03-1mm, and the flat wire can be selected to be 0.01-1mm wide and 0.01-1mm thick. Specifically, the present embodiment selects a flat wire as the traction wire 4. For example, the width of the flat wire is 0.3mm and the thickness is 0.1mm, which can reduce the diameter of the inner cavity of the wire, thereby minimizing the diameter of the catheter 7. In addition, a larger width can also ensure the strength of the traction wire 4. The distal end of the traction wire 4 is less than 5cm from the distal end of the catheter 7, and more preferably less than 3cm. This distance is too far, which may result in the distal end not being pulled and the traction effect cannot be achieved.

[0064] The wire winding shaft 3 is a solid cylindrical structure, and the diameter of the wire winding shaft 3 is 0.2-4mm, which can reduce the contact length of the traction wire 4. Similarly, when the wire winding shaft 3 rotates one circle, the length of the traction wire 4 released is also relatively short, the angle adjustment range is smaller, the accuracy of the wire release and retraction is higher, and it can adapt to more complex blood vessel bends. In addition, this wire winding shaft 3 is used for stretching and relaxing the traction wire 4. The wire winding shaft 3 can have a single or multiple wires for multi-directional bending.

[0065] The technical solution is to wind the traction wire 4 on the wire winding shaft 3, and rotate the handle 2 relative to the fixed handle 1, so that the wire winding shaft 3 rotates together with the rotating handle 2. During this process, the wire winding shaft 3 changes the length of the straight segment of the traction wire 4, so that the distance from the contact point where the catheter 7 and the traction wire 4 are connected to the wire winding shaft 3 can be more accurately adjusted, thereby improving the control accuracy of the length of the microcatheter 100, thereby improving the accuracy of controlling the angle of the head end of the microcatheter 100.

[0066] In other embodiments, it can be further configured that a positioning groove 31 is provided on the winding shaft 3, the positioning groove 31 is spirally provided on the winding shaft 3, and the traction wire 4 is located in the positioning groove 31 and is attached to the winding shaft 3. The positioning groove 31 is provided on the surface of the winding shaft 3 and has a spiral structure, and the size of the positioning groove 31 can be determined according to the size of the traction wire 4. The positioning groove 31 can make the traction wire 4 more firmly attached to the winding shaft 3, and the traction wire 4 is more stable when it is released and reeled in.

[0067] In other embodiments, it can be further configured to refer to Figure 4 and Figure 5 There are two winding shafts 3, and the parts of the two winding shafts 3 located in the cavity 11 are fixedly connected to the rotating handle 2. The winding direction of the traction wire 4 of one winding shaft 3 is clockwise, and the winding direction of the traction wire 4 of the other winding shaft 3 is counterclockwise.

[0068] Specifically, in this embodiment, there are two wire winding shafts 3, which are evenly distributed at 180° with reference to the center point of the rotating handle 2. The wire winding positioning groove 31 of one wire winding shaft 3 is spirally wound in a clockwise direction, while the other is the opposite, spirally wound in a counterclockwise direction. Because the two wire winding shafts 3 are simultaneously installed on a rotating handle 2, when the rotating handle 2 rotates, the length of the traction wire 4 on one wire winding shaft 3 decreases, and the length of the traction wire 4 in its straight section increases; the length of the traction wire 4 on the other wire winding shaft 3 increases, and the length of the traction wire 4 in its straight section decreases, thereby realizing the adjustment of the adjustable bend portion of the distal end of the traction catheter 7 in two directions.

[0069] In other embodiments, it can be further configured that the cavity 11 connects the inner space of the fixed handle 1 and the rotating handle 2, and the rotating handle 2 includes a rotating portion 21 and a mounting plate 22. The rotating portion 21 is located outside the cavity 11. Part of the mounting plate 22 is located inside the cavity 11 and is rotatably connected to the fixed handle 1, and part of the rotating portion 21 is connected to the mounting plate 22, and the wire winding shaft 3 is arranged on the side of the mounting plate 22 facing the catheter 7. Among them, the mounting plate 22 is configured to transmit the kinetic energy of the rotating portion 21 to change the length of the traction wire 4 on the wire winding shaft 3.

[0070] Specifically, in this embodiment, the surface of the rotating part 21 is treated with anti-skid treatment to prevent the doctor from slipping and being unable to accurately control the rotation angle of the rotating part 21. The rotating part 21 can drive the mounting plate 22 to rotate with the rotating part 21, and the mounting plate 22 and the winding shaft 3 can be fixed by welding, welding, gluing, threaded knobs, pins, buckle structures, etc. This embodiment adopts the welding fixing method, which has the advantage of being more firm.

[0071] View Figure 3 , Figures 6 to 8In other embodiments, the adjustable handle further includes a locking assembly 5, and the locking assembly 5 includes a locking member 51 that can be close to or away from the mounting plate 22. The mounting plate 22 is provided with a first clamping portion 23 on one side close to the locking member 51, and the locking member 51 is provided with a second clamping portion 512 corresponding to the first clamping portion 23, and the first clamping portion 23 and the second clamping portion 512 are tightly locked.

[0072] Specifically, in this embodiment, the first clamping portion 23 is a convex point, and the second clamping portion 512 is a concave groove. The number of convex points can be 1-3, and 1 is used in this embodiment. The number of concave grooves can be 6-24, evenly distributed at 360°. When the number is 6, the angle between each concave groove is 360° / 6=60°. In this embodiment, 12 concave grooves are used, and the angle is 30°; the smaller the angle, the higher the adjustment accuracy, and the range of length change of the traction wire 4 during a single adjustment can be more accurately controlled.

[0073] By utilizing the convex point located on the mounting disk 22, in this embodiment, the convex point is spherical, and the space inside the concave groove is spherical and can be adapted to the convex point. The convex point is clamped in the concave groove, so that the mounting disk 22 can be kept stationary relative to the locking portion 511 without being subjected to external force, thereby ensuring that the length of the straight segment of the traction wire 4 does not change, and can better maintain the bending angle of the adjustable bend portion at the distal end of the catheter 7.

[0074] View Figure 2 and Figure 8 In other embodiments, it can be further configured that the locking member 51 has a limiting portion 513 and a locking portion 511 that can be close to or away from the mounting plate 22, and the limiting portion 513 is configured to limit the movable direction of the locking portion 511, and the locking assembly 5 also includes an elastic member 52 and a limiting baffle 53. The elastic member 52 has a movable end 521 attached to the locking portion 511, a fixed end 523 relatively stationary with the fixed handle 1, and a telescopic section 522 arranged between the movable end 521 and the fixed end 523 and configured to provide elastic force and change its own length. The limiting baffle 53 is fixedly connected to the fixed handle 1, and the limiting baffle 53 has a limiting hole 531 that penetrates itself and communicates with the cavity 11. The limiting hole 531 is configured to allow the limiting portion 513 to movably pass through; wherein, the telescopic section 522 is sleeved on the limiting portion 513, and the fixed end 523 is in contact with and fixed to the limiting baffle 53. When the length of the telescopic section 522 itself is shortened or extended, the limiting portion 513 moves together with the locking portion 511.

[0075] Specifically, in this embodiment, the elastic member 52 is preferably a spring, and the elastic force generated by the compression of the telescopic end enables the mounting disk 22 to fit with the locking portion 511, thereby improving the locking effect of the convex point and the concave groove. When the mounting disk 22 rotates, the convex point is drawn out from the concave groove. During this process, the convex point contacts the locking portion 511 to make the locking portion 511 move away from the mounting disk 22, and the moving end 521 moves with the locking portion 511 to compress the length of the telescopic section 522; when the mounting disk 22 continues to rotate, the convex point slides from the surface of the locking portion 511 to the concave groove. During this process, the convex point contacts the concave groove to make the locking portion 511 close to the mounting disk 22, and the moving end 521 moves with the locking portion 511 to extend the length of the telescopic section 522.

[0076] In this way, the limiting portion 513 moves back and forth in the limiting hole 531 to limit the movement direction of the locking portion 511 connected thereto, and at the same time, the elastic member 52 is sleeved on the limiting portion 513, so that the telescopic displacement energy generated by the telescopic section 522 under force compression can be kept synchronized with the movement direction of the locking portion 511, avoiding asymmetry of the telescopic section 522 during the telescopic process, causing uneven elastic force applied by the moving end 521 to the locking portion 511, and reducing the locking effect between the locking portion 511 and the mounting plate 22.

[0077] In other embodiments, it can be further configured that the limiting portion 513 also has a pin hole 514, and the locking assembly 5 also includes a limiting pin 54, which passes through the pin hole 514 and is fixed to the limiting portion 513, and the limiting pin 54 is configured to limit the maximum length that the telescopic section 522 can extend.

[0078] In this way, the convex point can be prevented from sliding from the surface of the locking portion 511 to the concave groove. Due to the extension of the telescopic section 522, when the locking portion 511 is in contact with the mounting disk 22, the impact of the locking portion 511 on the mounting disk 22 is reduced, thereby improving the stability of the device.

[0079] View Fig. 9 and Fig.10 In other embodiments, it can be further configured that the adjustable handle also includes a positioning ring 6, the positioning ring 6 has a connecting portion 61 fixed to the wire winding shaft 3, the connecting portion 61 is formed with a wire threading hole 62 that penetrates itself and communicates with the cavity 11, the traction wire 4 passes through the wire threading hole 62 and is connected to the catheter 7, and the wire threading hole 62 is configured to limit the torsion angle of the traction wire 4 in the cavity 11.

[0080] In this way, the traction wire 4 enters the catheter 7 along the wire threading hole 62, which can guide the traction wire 4 and prevent the traction wire 4 from deviating when the adjustment handle is rotated. The traction wire 4 used in this embodiment can be made of metal wires such as stainless steel wire, nickel-titanium wire, cobalt-chromium alloy wire, or a high-strength polymer material.

[0081] View Figures 11 to 13 The utility model also proposes a microcatheter 100, which includes an adjustable handle and a catheter 7 connected to the adjustable handle. The specific structure of the adjustable handle refers to the above embodiment. Since the microcatheter 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0082] The catheter 7 includes an outer layer 71, a braided layer 72, and an inner layer 73 which are sequentially arranged from the outside to the inside, wherein the hardness of the proximal end of the outer layer 71 is greater than the hardness of the distal end.

[0083] Specifically, in this embodiment, the outer layer 71 is made of polymer materials, such as polyether block polyamide (Pebax), thermoplastic polyurethane (TPU), polyolefin elastomer (POE), polypropylene (PP), polyethylene (PE), etc. Such polymer materials can enter the human body without toxic side effects, and have a smooth surface without damaging blood vessels. The distal end uses a softer and thinner polymer tube with better reach performance, and the proximal end uses a thicker and harder polymer tube with stronger support capacity and better push force. Generally, the wall thickness can be selected from 0.05mm to 0.5mm, and the hardness can be controlled at 15D-85D. In this embodiment, the outer layer 71 uses polymer materials of different materials and thicknesses. The distal end uses TPU with a thickness of 0.1mm and a hardness of 60A, and the proximal end uses nylon material with a hardness of 80D. It can meet the push performance of the proximal end of the catheter 7 and the compliance performance of the distal end. Meanwhile, in order to enhance the developing property of the microcatheter 100 , a developing agent such as barium sulfate, iopamidol, iohexol, ioversol or other developing materials may be added to the outer layer 71 .

[0084] The braided layer 72 is woven from a metal material, and the braiding method can be one-press-one or one-press-two (one-press-one refers to a braiding method of one top and one bottom, and one-press-two refers to a braiding method of one top and two bottoms). In this embodiment, the one-press-two method is preferred. In other embodiments, in order to ensure excellent pushing performance at the proximal end, it can be further configured that both the proximal end and the distal end of the braided layer 72 are provided with springs. In this way, the pushing performance and anti-bending performance of the proximal end are guaranteed, while the softness and adjustable bending performance of the distal end are guaranteed.

[0085] The inner layer 73 is made of a polymer material, and the materials generally used are polytetrafluoroethylene (PTFE), polyolefin elastomer (POE), polyoxymethylene (POM), etc. Such materials are relatively smooth, have low friction, and can smoothly transport the traction wire 4. In this embodiment, PTFE is preferred. The wall thickness of the entire inner layer 73 is the same to ensure the uniformity and smoothness of its inner wall. The wall thickness is generally 0.005mm to 2mm, and the preferred wall thickness in this embodiment is 0.025mm.

[0086] View Fig.12 In other embodiments, it can be further configured that the catheter 7 also includes a wire wrapping tube 74, and the wire wrapping tube 74 is arranged between the braided layer 72 and the outer layer 71, and the wire wrapping tube 74 is configured to limit the direction of the traction wire 4.

[0087] The wire wrapping tube 74 is heat-fused together with the wall of the catheter 7 to establish a traction channel for the traction wire 4 and limit the direction of the traction wire 4. The inner diameter of the wire wrapping tube 74 is slightly larger than the outer diameter of the traction wire 4 and can be designed into an elliptical shape or an irregular shape to meet the demand for reducing the wall thickness, thereby reducing the outer diameter of the catheter 7 and facilitating the catheter 7 to adapt to blood vessels of more sizes.

[0088] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An adjustable handle for connecting to a catheter of a microcatheter, characterized in that: include: Fixed handle; A rotating handle, the rotating handle is rotatably connected to the fixed handle and forms a cavity, and at least a portion of the rotating handle is located in the cavity; A wire winding shaft, at least one of which is fixedly connected to the rotating handle located in the cavity; and A traction wire, the traction wire is configured to tractionally connect the wire winding shaft and the catheter located outside the cavity, and a section of the traction wire close to the wire winding shaft is wound around the wire winding shaft; When the rotating handle rotates relative to the fixed handle, the wire winding shaft moves along with the rotating handle. At this time, the length of the traction wire will increase or decrease to control the distance from the contact point where the catheter is connected to the traction wire to the wire winding shaft.

2. The adjustable handle according to claim 1, characterized in that: The wire winding shaft is provided with a positioning groove, which is spirally arranged on the wire winding shaft. The traction wire is located in the positioning groove and is attached to the wire winding shaft.

3. The adjustable handle according to claim 1, characterized in that: There are two wire winding shafts, and the parts of the two wire winding shafts located in the cavity are fixedly connected to the rotating handle. The winding direction of the traction wire of one wire winding shaft is clockwise, and the winding direction of the traction wire of the other wire winding shaft is counterclockwise.

4. The adjustable handle according to claim 1, characterized in that: The cavity connects the inner space of the fixed handle and the inner space of the rotating handle, and the rotating handle includes: a rotating portion, the rotating portion being located outside the cavity; and A mounting plate, part of which is located inside the cavity and is rotatably connected to the fixed handle, part of which is connected to the mounting plate, and the wire winding shaft is disposed on a side of the mounting plate facing the catheter; Wherein, the mounting disk is configured to transmit the kinetic energy of the rotating part to change the length of the traction wire on the winding shaft.

5. The adjustable handle according to claim 4, characterized in that: The adjustable handle also includes a locking assembly, which includes: A locking member capable of being attached to or away from the mounting plate; A first clamping portion is configured on one side of the mounting plate close to the locking member; The locking member is formed with a second clamping portion corresponding to the first clamping portion, and the first clamping portion and the second clamping portion are tightly locked.

6. The adjustable handle according to claim 5, characterized in that: The locking member comprises a limiting portion and a locking portion that can approach or depart from the mounting plate, wherein the limiting portion is configured to limit the movable direction of the locking portion, and the locking assembly further comprises: An elastic member, the elastic member comprising a movable end attached to the locking portion, a fixed end relatively stationary to the fixed handle, and a telescopic section disposed between the movable end and the fixed end and configured to provide elastic force and change its own length; and A limit baffle, the limit baffle is fixedly connected to the fixed handle, the limit baffle has a limit hole penetrating through the limit baffle and communicating with the cavity, and the limit hole is configured to allow the limit portion to movably pass through; The telescopic section is sleeved on the limiting portion, and the fixed end is in contact with and fixed to the limiting baffle. When the length of the telescopic section itself is shortened or extended, the limiting portion moves together with the locking portion.

7. The adjustable handle according to claim 6, characterized in that: The limiting portion also has a pin hole, and the locking assembly also includes a limiting pin, which passes through the pin hole and is fixed to the limiting portion, and the limiting pin is configured to limit the maximum length that the telescopic section can extend.

8. The adjustable handle according to claim 1, wherein: The adjustable handle also includes a positioning ring, which has a connecting portion fixed to the wire winding shaft, the connecting portion is formed with a wire threading hole that penetrates itself and communicates with the cavity, the traction wire passes through the wire threading hole and is connected to the catheter, and the wire threading hole is configured to limit the torsion angle of the traction wire in the cavity.

9. A microcatheter, characterized in that: The invention comprises the adjustable handle according to any one of claims 1 to 8 and the catheter connected to the adjustable handle, wherein the catheter comprises an outer layer, a braided layer, and an inner layer arranged in sequence from the outside to the inside, wherein the hardness of the proximal end of the outer layer is greater than the hardness of the distal end.

10. The microcatheter according to claim 9, characterized in that The catheter further comprises a wire wrapping tube, which is disposed between the braided layer and the outer layer, and is configured to limit the direction of the traction wire.

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