Catheter handle and steerable microcatheter

Abstract

The embodiment of the application provides a catheter handle and a controllable bending microcatheter, and relates to the technical field of microcatheters. The catheter handle is used for controlling the bending of the head end of the catheter. The catheter has a control wire. The catheter handle comprises a handle shell, a handle control knob and a control wire handle. The handle control knob is rotatably installed on the handle shell. The handle control knob is used for being connected with the control wire. The control wire handle is slidably installed on the handle shell. The control wire handle is used for abutting against the control wire. When the control wire handle is slid relative to the handle shell to tension the control wire, the handle control knob is rotated to pull the control wire and make the head end of the catheter bend. Since the control wire handle is slidably installed on the handle shell, the control wire can be tensioned. Therefore, when the handle control knob is rotated to pull the control wire, the bending of the head end of the catheter can be more accurately controlled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of microcatheter, in particular to a catheter handle and a controllable bending microcatheter. BACKGROUND

[0002] Chronic Total Occlusion (CTO) is a kind of coronary artery disease, which means the original coronary artery is completely occluded. Microcatheter is an essential tool for treating CTO lesions, and often needs to use a guide wire to improve the superselection of the microcatheter and improve the support and passability of the microcatheter.

[0003] However, when passing through complex coronary artery lesions such as bifurcation lesions, the controllability of the microcatheter is obviously insufficient, and it cannot provide accurate tracking, and the guide wire has poor controllability. Moreover, with the increasingly wide application of microcatheters in aneurysm interventional surgery, the microcatheter is used as an auxiliary transport tool to inject spring coils, embolic particles, embolic microspheres and other media into the blood vessel, and needs to pass through the tortuous blood vessels to achieve precise targeted therapy, so the shaping and controllability of the head end of the microcatheter are increasingly high.

[0004] In the prior art, although the controllable bending microcatheter can control the bending of the catheter head end, it cannot accurately adjust the bending angle of the catheter head end, and the controllability and control precision are poor. SUMMARY

[0005] The present application provides a catheter handle and a controllable bending microcatheter, which can accurately control the bending angle of the catheter head end.

[0006] Embodiments of the present application can be implemented as follows:

[0007] In a first aspect, the present application provides a catheter handle for controlling the bending of the catheter head end of a catheter, the catheter having a steering wire, the catheter handle comprising:

[0008] a handle housing;

[0009] a handle control knob rotatably mounted on the handle housing, the handle control knob being configured to be connected to the steering wire; and

[0010] a steering wire handle slidably mounted on the handle housing, the steering wire handle being configured to abut against the steering wire;

[0011] wherein, in the case that the steering wire handle is slid relative to the handle housing to tension the steering wire, the handle control knob is rotated to pull the steering wire and bend the catheter head end.

[0012] In an optional embodiment, the steering wire handle is provided with a limiting buckle, and the handle housing is provided with a limiting protrusion.

[0013] Wherein, in the case that the handle control knob is slid relative to the handle shell to a preset position, the limiting buckle is clamped with the limiting protrusion to lock the handle control knob.

[0014] In an optional embodiment, the handle control knob comprises a knob upper cover, a rotating member and a knob lower cover, the knob lower cover is slidably mounted on the handle shell, the rotating member is rotatably mounted on the knob lower cover, and the knob upper cover is buckled on the knob lower cover.

[0015] In an optional embodiment, the rotating axis of the rotating member is parallel to the rotating axis of the handle control knob.

[0016] In an optional embodiment, the knob lower cover is provided with an arc-shaped slot, and the part of the outer wall of the rotating member and the arc-shaped inner wall of the arc-shaped slot define an arc-shaped limiting space, and the arc-shaped inner wall of the arc-shaped slot is used for guiding the guide wire to pass through the arc-shaped limiting space.

[0017] In an optional embodiment, the handle control knob comprises a guide wire fixing disc, a force relieving concave disc, a force relieving convex disc and a knob cover which are sequentially assembled, the guide wire fixing disc is rotatably mounted on the handle shell and is used for connecting with the guide wire.

[0018] Wherein, in the case that the handle control knob is slid relative to the handle shell to a preset position, the limiting buckle is clamped with the limiting protrusion to lock the handle control knob.

[0019] In an optional embodiment, the locking buckle is used for abutting against and pushing the handle control knob to slide to tension the guide wire.

[0020] In an optional embodiment, the guide wire fixing disc has a plurality of columns which are distributed at intervals around the rotating center line of the handle control knob, and the part of the guide wire is used for being wound on the plurality of columns at the same time.

[0021] In an optional embodiment, the catheter handle further comprises a locking buckle which is slidably connected to the handle shell, and the locking buckle is used for abutting against or being separated from the handle control knob to lock or unlock the handle control knob.

[0022] In an optional embodiment, the catheter handle further comprises a catheter seat and a stress protection tube, and the catheter seat and the stress protection tube are connected to the handle shell.

[0023] In a second aspect, the present application provides a controllable bending microcatheter, comprising a catheter and the catheter handle of any one of the preceding embodiments, the catheter handle and the catheter being connected to control the bending of the distal end of the catheter.

[0024] In an optional embodiment, the catheter comprises a catheter body segment, a catheter head end and a steering wire, the catheter body segment being mounted in the handle housing, the catheter head end being connected to the distal end of the catheter body segment, and the steering wire being connected to the catheter head end.

[0025] The catheter handle and the controllable bending microcatheter of the embodiments of the present application have the following advantages, for example:

[0026] The present application provides a catheter handle for controlling the bending of a catheter head end of a catheter, the catheter having a steering wire, the catheter handle comprising a handle housing, a handle control knob rotatably mounted in the handle housing and configured to be connected to the steering wire, and a steering wire lever slidably mounted in the handle housing and configured to abut the steering wire, wherein, in the case that the steering wire lever is slid relative to the handle housing to tension the steering wire, the handle control knob is rotated to pull the steering wire and bend the catheter head end. Since the steering wire lever is slidably mounted in the handle housing, the steering wire can be tensioned, and thus the bending of the catheter head end can be more accurately controlled when the handle control knob is rotated to pull the steering wire.

[0027] The present application provides a controllable bending microcatheter, comprising a catheter and the catheter handle of any one of the preceding embodiments, the catheter handle and the catheter being connected to control the bending of the distal end of the catheter. The controllable bending microcatheter has all the functions of the handle. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and thus should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0029] Figure 1 It is a top view schematic diagram of the controllable bending microcatheter provided in the embodiments of the present application;

[0030] Figure 2 It is an exploded perspective view of the handle bottom cover and the handle top cover of the catheter handle provided in the embodiments of the present application;

[0031] Figure 3 It is an exploded perspective view of the handle control knob and the knob tray, the steering wire lever, and the handle bottom cover assembly provided in the embodiments of the present application;

[0032] Figure 4 Figure 1 is a plan view showing the steering wire handle in the original state, with the first and second steering wires in the relaxed state;

[0033] Figure 5 Figure 2 is a plan view showing the steering wire handle being pulled back, with the first and second steering wires in the tensioned state;

[0034] Figure 6 Figure 3 is a plan view showing the first and second steering wires in the tensioned state, with the handle control knob being rotated clockwise to bend the catheter head to the right;

[0035] Figure 7 Figure 4 is a plan view showing the first and second steering wires in the tensioned state, with the handle control knob being rotated counterclockwise to bend the catheter head to the left;

[0036] Figure 8 Figure 5 is a transverse sectional view of the controllable bending microcatheter head, which is the A-A sectional view of Figure 1; Figure 1

[0037] Figure 9 Figure 6 is a longitudinal sectional view of the controllable bending microcatheter head, which is the B-B sectional view of Figure 1; Figure 2

[0038] Figure 7 is a plan view showing the locking buckle in the locked state, with the handle control knob being fixed and unable to rotate; Figure 10

[0039] Figure 8 is a plan view showing the locking buckle in the unlocked state, with the handle control knob being able to rotate clockwise or counterclockwise. Figure 11

[0040] ​​Icon: 01-catheter handle; 02-catheter body section; 03-catheter tip; 04-catheter seat; 05-stress protection tube; 06-handle bottom cover; 07-handle upper cover; 08-handle control knob; 09-locking buckle; 10-operating wire handle; 11-first groove; 12-first buckle; 13-force relief concave disc; 14-force relief convex disc; 15-knob cover; 16-operating wire fixing disc; 17-knob tray; 18-handle lower cover; 19-rotary part; 20-handle upper cover; 31-second buckle; 32-second groove; 21a-first operating wire; 21b-second operating wire; 22-first outer tube; 23-second outer tube; 24a-second cavity; 24b-third cavity; 25-stainless steel wire; 26-woven wire; 27-first cavity; 28-development ring; 29-limiting buckle; 30-limiting protrusion. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0043] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0044] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0045] In addition, if the terms "first", "second", and the like appear, they are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0046] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0047] As mentioned in the background section, chronic total occlusion (CTO) of the coronary arteries refers to the complete occlusion of the original coronary artery. Microcatheters are an essential tool for treating CTO lesions, and guidewires are often used to improve the superselectivity of microcatheters, thereby enhancing their support and permeability.

[0048] However, when navigating complex coronary artery lesions such as bifurcation lesions, the microcatheter's maneuverability is significantly insufficient, it cannot provide accurate tracking, and the guidewire maneuverability is poor.

[0049] Furthermore, as the application of microcatheters in interventional aneurysm surgery becomes more and more widespread, microcatheters, as auxiliary transport tools, inject media such as coils, embolization particles, and embolization microspheres into blood vessels. They need to pass through tortuous blood vessels to achieve precise targeted treatment, so the shaping and maneuverability of the microcatheter tip are becoming increasingly important.

[0050] In the prior art, although the controllable bending microcatheter can control the bending of the catheter tip, due to structural defects in its structure and the wire fixing plate, the pull wire used to bend the catheter tip is prone to loosening. The knob used to move the pull wire has empty stroke or even slips or gets tangled during rotation, making it impossible to accurately adjust the bending angle of the catheter tip. The controllable bending microcatheter has poor controllability and control precision.

[0051] In view of this, please refer to Figures 1-11 The catheter handle 01 and controllable bending microcatheter provided in the embodiments of the present invention can solve this problem, and will be described in detail below.

[0052] It should be noted that in this application, the terms "proximal" and "distal" are commonly used terms in the medical field. Specifically, "distal" refers to the end away from the operator during the surgical procedure, and "proximal" refers to the end closer to the operator during the surgical procedure.

[0053] Please refer to Figure 1 The present invention provides a controllable bending microcatheter, which includes a catheter and a catheter handle 01. The catheter handle 01 is connected to the catheter, and the catheter has an operating line. The catheter handle 01 is connected to the operating line of the catheter to control the bending of the distal end of the catheter.

[0054] Specifically, the catheter comprises a catheter body segment 02, a catheter head end 03, and two control lines, namely a first control line 21a and a second control line 21b, the catheter body segment 02 is installed in the handle shell, the catheter head end 03 is connected to the distal end of the catheter body segment 02, and the first control line 21a and the second control line 21b are both connected to the catheter head end 03.

[0055] The catheter handle 01 can pull the first control line 21a or the second control line 21b to bend the catheter head end 03. It should be noted that in this embodiment, the flexibility of the catheter head end 03 is greater than that of the catheter body segment 02, so that the bending degree of the catheter head end 03 is greater than that of the catheter body segment 02, thereby improving the flexibility of the catheter.

[0056] For example, Figure 1 In a, a plan view of the angle at which the catheter handle 01 operates in one direction and the catheter head end 03 can be bent is shown. Figure 1 In b, a plan view of the angle at which the catheter handle 01 operates in another direction and the catheter head end 03 can be bent is shown, that is, the catheter head end 03 can be freely and bidirectionally adjusted to any angle within one hundred and eighty degrees.

[0057] Please refer to Figure 8 and Figure 9 In this embodiment, the catheter body segment 02 is a multi-cavity composite tube, which has three cavities. Specifically, the catheter body segment 02 comprises a first cavity 27, a second cavity 24a and a third cavity 24b. The first cavity 27 is formed by a layer of PTFE (polytetrafluoroethylene) tube. The second cavity 24a is located on the left side of the first cavity 27 and is composed of a layer of PI (polyimide) tube. The first control line 21a is arranged in the second cavity 24a. The third cavity 24b is located on the right side of the first cavity 27 and is composed of a layer of PI (polyimide) tube. The second control line 21b is arranged in the third cavity 24b.

[0058] The catheter body segment 02 further comprises sixteen stainless steel wires 25, which are interlaced into braided wires 26 two by two, and are wound and braided on the outer surface of the first cavity 27. At the same time, the second cavity 24a and the third cavity 24b are wrapped on the left and right sides by using the first outer layer tube 22 after heat melting, and are symmetrical about the axis of the first cavity 27. Then, the second outer layer tube 23 is wrapped on the first outer layer tube 22.

[0059] It should be noted that the first outer layer tube 22 and the second outer layer tube 23 can both be PEBAX (polyether block polyamide) tubes, and no braided layer is arranged on the first outer layer tube 22 and the first outer layer tube 22.

[0060] It should be noted that the difference between the catheter head end 03 and the catheter body segment 02 is that the distance from the end face of the catheter head end 03 is about 1mm, and the development ring 28 with a length of about 1mm is arranged. The length of the development ring 28 here can be understood as the size in the direction of the axis of the first cavity 27.

[0061] The development ring 28 is pressed on the braided wire 26 and the first operating wire 21a and the second operating wire 21b, and the first operating wire 21a and the second operating wire 21b are separately welded on the development ring 28. By pulling the first operating wire 21a or the second operating wire 21b, the development ring 28 is inclined to the direction of the pulling force, causing the catheter head end 03 to be bent at a certain angle.

[0062] Next, please refer to Figure 2 and Figure 3 , specifically for the catheter handle 01, the catheter handle 01 is used to control the bending of the catheter head end 03, the catheter handle 01 includes a handle shell, a handle control knob 08 and an operating wire handle 10, the handle control knob 08 is rotatably installed on the handle shell, the handle control knob 08 is used to connect with the operating wire, and the operating wire handle 10 is slidably installed on the handle shell, and the operating wire handle 10 has a contact surface for abutting the operating wire.

[0063] Wherein, in the case that the operating wire handle 10 slides relative to the handle shell to tension the operating wire, the handle control knob 08 is rotated to pull the first operating wire 21a or the second operating wire 21b, and the catheter head end 03 is bent. Since the operating wire handle 10 is slidably installed on the handle shell, the first operating wire 21a and the second operating wire 21b can be tensioned, and thus when the handle control knob 08 pulls the first operating wire 21a or the second operating wire 21b by rotating, the handle control knob 08 does not have an idle stroke, and the bending of the catheter head end 03 can be more accurately controlled.

[0064] Specifically, the handle shell includes a handle bottom cover 06 and a handle upper cover 07, the handle bottom cover 06 is provided with a first buckle 12 and a second groove 32, and the handle upper cover 07 is provided with a first groove 11 and a second buckle 31, the first buckle 12 and the first groove 11 are matched, and the second groove 32 and the second buckle 31 are matched, so that the handle upper cover 07 can be detachably installed on the handle bottom cover 06.

[0065] At the same time, the catheter handle 01 also includes a catheter seat 04 and a stress protection tube 05, the catheter seat 04 and the stress protection tube 05 are connected to the handle shell, the catheter body segment 02 can pass through the stress protection tube 05, and the stress protection tube 05 can provide a certain supporting force to the catheter body segment 02 to avoid bending of the catheter body segment 02.

[0066] In addition, the catheter handle 01 further comprises a locking buckle 09, which is slidably connected to the handle shell and is used to abut or be separated from the handle control knob 08 to lock or unlock the handle control knob 08. Meanwhile, the locking buckle 09 is also used to abut and push the operating wire handle 10 to slide to tension the operating wire.

[0067] Specifically, as shown in Figure 10 and Figure 11 , when the locking buckle 09 slides to the right and abuts against the handle control knob 08, the handle control knob 08 can be locked, at this time, the handle control knob 08 cannot be rotated. When the locking buckle 09 slides to the left and abuts against the operating wire handle 10, the operating wire handle 10 can be driven to move away from the handle control knob 08, at this time, the operating wire handle 10 can tension the operating wire.

[0068] In Figure 10 , when the catheter handle 01 is in an initial state of non-use, the locking buckle 09 clamps the handle control knob 08 so that it cannot be rotated clockwise or counterclockwise. At this time, the operating wire handle 10, the first operating wire 21a and the second operating wire 21b are all in an original relaxed state.

[0069] In Figure 11 , the locking buckle 09 is pushed backward to move the operating wire handle 10 backward, so that the first operating wire 21a and the second operating wire 21b are both in a taut state, and the handle control knob 08 can be rotated clockwise or counterclockwise at this time.

[0070] In order to facilitate the operating wire handle 10 to continuously ensure that the operating wire is in a taut state after tensioning the operating wire, the operating wire handle 10 is provided with a limiting buckle 29, and the handle bottom cover 06 of the handle shell is provided with a limiting protrusion 30. In the case that the operating wire handle 10 slides relative to the handle shell to a preset position, the limiting buckle 29 is clamped with the limiting protrusion 30 to lock the operating wire handle 10. The preset position herein can be understood as the position of the operating wire handle 10 when the limiting buckle 29 is clamped with the limiting protrusion 30.

[0071] Please refer to Figure 3 again, the operating wire handle 10 comprises a handle upper cover 20, a rotating piece 19 and a handle lower cover 18. The handle lower cover 18 is slidably installed in the handle shell, the rotating piece 19 is rotatably installed in the handle lower cover 18, and the handle upper cover 20 is buckled on the handle lower cover 18. The side of the handle upper cover 20 away from the handle bottom cover 06 is protruded to form an abutting portion. The locking buckle 09 can contact and push the abutting portion to move the operating wire handle 10 away from the handle control knob 08.

[0072] In this embodiment, the rotating piece 19 is a bearing, and the rotating axis of the rotating piece 19 is parallel to the rotating axis of the handle control knob 08.

[0073] Meanwhile, please refer to Figure 3 and Figure 4 , the lower cover 18 of the handle is provided with an arc-shaped slot, and the outer wall of the rotating member 19 and the arc-shaped inner wall of the arc-shaped slot define an arc-shaped limiting space, and the arc-shaped inner wall of the arc-shaped slot is used to guide the first control wire 21a and the second control wire 21b to pass through the arc-shaped limiting space.

[0074] Please refer to Figure 3 again, the knob tray 17 is installed on the handle bottom cover 06, the handle control knob 08 includes the control wire fixing disc 16, the force relieving concave disc 13, the force relieving convex disc 14 and the knob cover 15 which are sequentially assembled, the control wire fixing disc 16 is rotatably installed on the handle shell through the knob tray 17, and is used to be connected with the control wire, wherein, in the case that the handle control knob 08 is rotated to pull the control wire and bend the catheter head 03, the handle control knob 08 is rotated to pull the control wire and bend the catheter head 03.

[0075] It should be noted that, in order to facilitate the rotation of the knob cover 15 and facilitate the abutment and locking of the locking buckle 09 with the handle control knob 08, a plurality of grooves are arranged on the peripheral wall of the knob cover 15 to increase the friction when the knob cover 15 is rotated, and at the same time, the locking buckle 09 can abut in the grooves to limit the rotation of the knob cover 15.

[0076] In addition, it should be noted that, in order to facilitate the winding and fixing of the first control wire 21a and the second control wire 21b, the control wire fixing disc 16 has a plurality of columns, the columns are cylindrical, the axis of the columns is parallel to the rotation center line of the knob cover 15, and the plurality of columns are uniformly and spacedly distributed around the rotation center line of the handle control knob 08, and the part of the wire body of the control wire is used to be wound on the plurality of columns at the same time, and the control wire fixing disc 16 and the force relieving concave disc 13 are connected and fixed by clamping.

[0077] For example, the first control wire 21a and the second control wire 21b can be wound on the outer walls of all the columns at the same time and fixed by the control wire fixing disc 16, at this time, the first control wire 21a and the second control wire 21b can be wound on the control wire fixing disc 16 in a polygonal structure, and at the same time, after winding, the first control wire 21a and the second control wire 21b can be fixed with the control wire fixing disc 16 in the area between adjacent columns.

[0078] Please refer to Figures 2-4 again, in the process of assembling the catheter handle 01, the locking buckle 09 is assembled to the handle upper cover 07, and at the same time, the handle upper cover 20, the rotating member 19 and the handle lower cover 18 are assembled into the control wire handle 10.

[0079] Next, the first control line 21a and the second control line 21b are passed through the arc-shaped limiting space of the control line lever 10 and wound and fixed on the column of the control line fixing plate 16. Then, the control line fixing plate 16, the unloading concave plate 13, the unloading convex plate 14, and the knob cover 15 are assembled into the handle control knob 08. Then, the knob tray 17 and the control line lever 10 are installed in the corresponding slots of the handle bottom cover 06 in sequence. The handle control knob 08 is then installed on the knob tray 17. Finally, the guide seat 04 is installed, the handle top cover 07 is covered, and the stress protection tube 05 is put on to complete the assembly of the guide handle 01.

[0080] Please refer to Figures 4 to 7 ,like Figure 4 The diagram shows a top view of the control cable lever 10 in its original state, with both the first control cable 21a and the second control cable 21b in a relaxed state.

[0081] exist Figure 4 In the process, the first control line 21a passes through the main body section 02 of the catheter, passes through the arc-shaped limiting space, that is, passes through the rotating member 19, and then wraps around the control line fixing plate 16 one and a half times and is fixed to the control line fixing plate 16. At the same time, the second control line 21b passes through the main body section 02 of the catheter, intersects with the first control line 21a, passes through the arc-shaped limiting space, and then wraps around the control line fixing plate 16 one and a half times and is fixed to the control line fixing plate 16.

[0082] Please refer to Figure 5 Move the locking buckle 09 backward, that is, move the locking buckle 09 away from the control cable fixing plate 16, push the control cable lever 10 backward, and both the first control cable 21a and the second control cable 21b are in a taut state. In addition, the limiting buckle 29 engages with the limiting protrusion 30, restricting the control cable lever 10 from approaching the handle control knob 08. At this time, the tube head is in a straight state.

[0083] Please refer to Figure 6 Rotate the control knob 08 clockwise. The first control cable 21a will be tightened clockwise around the control cable fixing disc 16, and the guide tube end 03 will bend to the right. The second control cable 21b will be in a slack state because it has been wound in the opposite direction for one and a half turns.

[0084] The angle at which the catheter tip 03 bends to the right varies depending on the angle at which the control knob 08 is rotated clockwise. For example, the greater the angle at which the control knob 08 is rotated clockwise, the more likely the catheter tip 03 will be bent at the preset bending angle. After adjusting to the preset bending angle, the locking buckle 09 can be pulled back to lock the bending angle of the catheter tip 03.

[0085] The greater the angle of the catheter head 03 bending to the right, the more linear the angle adjustment of the catheter head 03 bending to the right, the more flexible the control, and the higher the precision.

[0086] Please refer to Figure 7 , it is illustrated that the first control wire 21a and the second control wire 21b are in a tension state, and counterclockwise rotation of the handle control knob 08 can achieve a plan view of the catheter head 03 bending to the left. Counterclockwise rotation of the handle control knob 08 causes the second control wire 21b to be tightened counterclockwise around the pull wire fixing disc, and the catheter head 03 bends to the left. However, the first control wire 21a is in a relaxed state due to the reason that it is wound in the opposite direction by half a turn.

[0087] The greater the angle of the catheter head 03 bending to the left, the more linear the angle adjustment of the catheter head 03 bending to the left, the more flexible the control, and the higher the precision.

[0088] In summary, the catheter handle 01 is used to control the bending of the catheter head 03 of the catheter, the catheter has a control wire, the catheter handle 01 includes a handle shell, a handle control knob 08, and a control wire lever 10. The handle control knob 08 is rotatably installed on the handle shell, the handle control knob 08 is used to connect with the control wire, and the control wire lever 10 is slidably installed on the handle shell, and the control wire lever 10 has a lever for abutting the control wire.

[0089] In the case of sliding the control wire lever 10 relative to the handle shell to tension the control wire, rotating the handle control knob 08 to pull the control wire and bend the catheter head 03. Since the control wire lever 10 is slidably installed on the handle shell, the control wire can be tensioned, and the bending of the catheter head 03 can be more accurately controlled when the handle control knob 08 is rotated to pull the control wire.

[0090] The controllable bending microcatheter includes a catheter and the above-mentioned catheter handle 01, and the catheter handle 01 is connected with the catheter to control the bending of the distal end of the catheter. The controllable bending microcatheter has all the functions of the above-mentioned handle.

[0091] In addition, compared with the microcatheter in the prior art, the controllable bending microcatheter can reach the lesion site through the tortuous blood vessels without the help of a guide wire, because the catheter head 03 bends flexibly.

[0092] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A catheter handle for controlling bending of a catheter tip (03) of a catheter having a steering wire, characterized in that, The catheter handle comprises: a handle housing; a handle control knob (08) rotatably mounted on the handle housing, the handle control knob (08) being used for connecting with the steering wire; and a steering wire handle (10) slidably mounted on the handle housing, and the steering wire handle (10) having a handle upper cover (20), a rotating piece (19) and a handle lower cover (18), the handle lower cover (18) being slidably mounted on the handle housing, the rotating piece (19) being rotatably mounted on the handle lower cover (18), and the handle upper cover (20) being buckled on the handle lower cover (18), the handle lower cover (18) being provided with an arc-shaped slot, and part of the outer wall of the rotating piece (19) and the arc-shaped inner wall of the arc-shaped slot defining an arc-shaped limiting space, and the arc-shaped inner wall of the arc-shaped slot being used for guiding the steering wire to pass through the arc-shaped limiting space. Wherein, in the case that the steering wire handle (10) slides relative to the handle housing to tension the steering wire, the handle control knob (08) is rotated to pull the steering wire and bend the catheter head end (03).

2. The catheter handle of claim 1, wherein, The steering wire handle (10) is provided with a limiting buckle (29), and the handle housing is provided with a limiting protrusion (30); Wherein, in the case that the steering wire handle (10) slides relative to the handle housing to a preset position, the limiting buckle (29) is clamped with the limiting protrusion (30) to lock the steering wire handle (10).

3. The catheter handle of claim 1, wherein, The handle control knob (08) comprises a steering wire fixing disc (16), a force relieving concave disc (13), a force relieving convex disc (14) and a knob cover (15) which are sequentially assembled, the steering wire fixing disc (16) being rotatably mounted on the handle housing and being used for connecting with the steering wire; Wherein, in the case that the steering wire handle (10) slides relative to the handle housing to tension the steering wire, the knob cover (15) is rotated to pull the steering wire and bend the catheter head end (03).

4. The catheter handle of claim 3, wherein, The steering wire fixing disc (16) has a plurality of columns which are distributed at intervals around the rotation center line of the handle control knob (08), and part of the wire body of the steering wire is used for being simultaneously wound on the plurality of columns.

5. The catheter handle of claim 1, wherein, The catheter handle further comprises a locking buckle (09) which is slidably connected to the handle housing, and the locking buckle (09) is used for abutting against or being separated from the handle control knob (08) to lock or unlock the handle control knob (08).

6. The catheter handle of claim 5, wherein, The locking buckle (09) is used for abutting against and pushing the steering wire handle (10) to slide to tension the steering wire.

7. A steerable microcatheter, comprising: The catheter handle and the catheter are connected to control the bending of the distal end of the catheter.

8. The steerable microcatheter of claim 7, wherein, The catheter comprises a catheter body section (02), a catheter head end (03) and a steering wire, the catheter body section (02) is mounted in the handle housing, the catheter head end (03) is connected to the distal end of the catheter body section (02), and the steering wire is connected with the catheter head end (03).

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