Bending adjusting conduit

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a bending adjusting catheter which comprises a catheter body and a pull wire, a plurality of pull wire cavities are formed in the catheter body at intervals in the circumferential direction, and each pull wire cavity extends in the axial direction of the catheter body and penetrates through the near end of the catheter body; the pull wire penetrates through the pull wire cavity, part of the wire segment of the pull wire is embedded in the far end of the catheter body so that the pull wire can be fixedly connected with the far end of the catheter body, and at least one end of the pull wire extends out of the near end of the catheter body. According to the bending adjusting catheter, part of the line segment of the pull line is embedded in the far end of the catheter body, the pull line and the far end of the catheter body can be fixedly connected firmly and reliably, connection looseness of the pull line is effectively prevented, the service life is prolonged, at least one end of the pull line extends out of the near end of the catheter body, and the bending adjusting catheter is convenient to use. The bending amount of the catheter body can be conveniently controlled through the pull wire.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a bending-adjusting catheter. Background Art

[0002] Intracardiac ultrasound (ICE) is an innovative echocardiographic diagnostic technology that uses a catheter to deliver a miniature transducer to the heart cavity through the vein. The transducer emits sound waves and receives echo signals. The echo signals are processed by a computer to form an ultrasound image, providing high-resolution images of the anatomical structure of the heart cavity and other intracardiac catheters and equipment, and real-time monitoring of hemodynamic status. Intracardiac ultrasound is not hindered by structures around the heart, such as ribs, and does not require general anesthesia. It improves the accuracy and safety of surgeries such as radiofrequency ablation of atrial fibrillation and left atrial appendage closure, reduces surgical risks, reduces complications, reduces surgical costs, and improves patient comfort and surgical efficiency. In addition, intracardiac ultrasound can also effectively reduce the use of X-rays and reduce radiation to patients and doctors.

[0003] In the prior art, the catheter on which the transducer is installed is usually a wire-type adjustable bending catheter, and a force is applied to the proximal end of the wire to bend the distal end of the catheter. However, when the catheter is bent for a long time, the connection between the wire and the catheter may become loose, which affects the service life of the catheter. Utility Model Content

[0004] The utility model aims to provide a bending-adjusting conduit, which can effectively prevent the connection of a pull wire from being loosened and prolong the service life.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Provided is a bending-adjusting catheter, comprising:

[0007] The catheter body is provided with a plurality of wire pulling cavities spaced apart along the circumferential direction, each of the wire pulling cavities extending along the axial direction of the catheter body and penetrating the proximal end of the catheter body;

[0008] A pull wire is passed through the pull wire cavity, a part of the pull wire is buried in the distal end of the catheter body so that the pull wire is fixedly connected to the distal end of the catheter body, and at least one end of the pull wire extends out of the proximal end of the catheter body.

[0009] Optionally, the catheter body includes a bending adjustment section and a reinforcement section from the proximal end to the distal end, the hardness of the reinforcement section is greater than the hardness of the bending adjustment section, the distal end of the bending adjustment section and the proximal end of the reinforcement section are fused into one, the pull wire cavity extends to the fusion area between the bending adjustment section and the reinforcement section, and part of the pull wire is buried in the fusion area between the bending adjustment section and the reinforcement section.

[0010] Optionally, the material of the bending section is polyamide, polyether block polyamide, high-density polyethylene or low-density polyethylene; and / or

[0011] the material of the reinforcement section is polycaprolactam, polyurethane or high-density polyethylene.

[0012] Optionally, the catheter body is circumferentially and spacedly provided with an even number of the wire drawing cavities, and two of the wire drawing cavities are set as a group, and the two wire drawing cavities in the same group are symmetrically arranged with the central axis of the catheter body as the center.

[0013] Optionally, the catheter body is circumferentially and spacedly provided with an even number of the wire drawing cavities, and two of the wire drawing cavities arranged at an interval of 180° are set as a group; wherein,

[0014] one wire is threaded through the two wire drawing cavities in the same group, and both ends of the wire extend out of the proximal end of the catheter body, and the middle section of the wire is buried in the distal end of the catheter body; or

[0015] the wires are respectively threaded through the wire drawing cavities, the distal ends of the wires are buried in the distal end of the catheter body, and the proximal ends of the wires extend out of the proximal end of the catheter body.

[0016] Optionally, at least one knotting point is provided on a partial line segment of the wire buried in the distal end of the catheter body.

[0017] Optionally, the catheter body is provided with a wiring channel through which the wires of the transducer can be threaded, and the cross-sectional shape of the wiring channel is set as a circle or a cross.

[0018] Optionally, the catheter body includes at least one layer of tube sleeve.

[0019] Optionally, it further includes an operating handle, the operating handle is connected to the proximal end of the catheter body, the operating handle is provided with a rotatable transmission member, the transmission member is provided with a wire winding portion, and the corresponding wire is wound on the wire winding portion.

[0020] Optionally, the transmission member is set as a gear member, the gear members are arranged in one-to-one correspondence with the wire drawing cavities, and the gear member is provided with the wire winding portion; or

[0021] the transmission member is set as a screw, the screw is provided with the wire winding portion, the catheter body is circumferentially and spacedly provided with an even number of the wire drawing cavities, and two of the wire drawing cavities arranged at an interval of 180° are arranged in one-to-one correspondence with two meshing screws.

[0022] The beneficial effects of the present utility model:

[0023] The bending-adjusting catheter provided by the present utility model buries partial line segments of the pulling wire at the distal end of the catheter body, which can make the fixed connection between the pulling wire and the distal end of the catheter body firm and reliable, effectively prevent the connection of the pulling wire from loosening, extend the service life, and at least one end of the pulling wire extends out of the proximal end of the catheter body, facilitating the control of the bending amount of the catheter body through the pulling wire. Description of the Drawings

[0024] Figure 1 is a schematic structural view of an embodiment of the bending-adjusting catheter provided by the present utility model;

[0025] Figure 2 is a cross-sectional view of another embodiment of the bending-adjusting catheter provided by the present utility model;

[0026] Figure 3 is a cross-sectional view of yet another embodiment of the bending-adjusting catheter provided by the present utility model;

[0027] Figure 4 is a schematic structural view of the connection structure between the pull ring and the pulling wire provided by the present utility model;

[0028] Figure 5 is a schematic structural view of the bending-adjusting catheter with the transmission member being a gear member provided by the present utility model;

[0029] Figure 6 is a cross-sectional view of the bending-adjusting catheter with the transmission member being a gear member provided by the present utility model;

[0030] Figure 7 is a schematic structural view of the operating handle with the transmission member being a screw provided by the present utility model;

[0031] Figure 8 is a cross-sectional view of the operating handle with the transmission member being a screw provided by the present utility model;

[0032] Figure 9 is a schematic structural view of the present utility model with two screws having the same helix direction;

[0033] Figure 10 is a schematic winding diagram of the pulling wire of the present utility model with two screws having the same helix direction;

[0034] Figure 11 is a schematic structural view of the present utility model with two screws having opposite helix directions;

[0035] Figure 12 is a schematic winding diagram of the pulling wire of the present utility model with two screws having opposite helix directions.

[0036] In the figure:

[0037] 100. Conduit body; 101. Pull wire cavity; 102. Wiring channel; 110. Bend adjustment section; 120. Reinforcement section; 130. Pipe sleeve;

[0038] 200. Pull wire; 210. Intermediate section; 211. Knotting point;

[0039] 300. Pull wire loop; 310. Through hole;

[0040] 400. Operating handle; 401. Wire winding part; 410. Gear part; 420. Screw; 430. Handwheel; 440. Sleeve; 450. Tension spring. Specific embodiments

[0041] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model rather than all structures are shown in the drawings.

[0042] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0043] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can include the direct contact between the first and second features, or can also include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and over", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and under", and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0044] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0045] Reference Figure 1 As shown, this embodiment provides a bending-adjusting catheter, which includes a catheter body 100 and a pull wire 200 .

[0046] Specifically, the catheter body 100 is provided with a plurality of wire pulling cavities 101 spaced apart along the circumferential direction, each wire pulling cavity 101 extends along the axial direction of the catheter body 100 and penetrates the proximal end of the catheter body 100; the wire pulling 200 is passed through the wire pulling cavity 101, and a part of the wire pulling 200 is buried in the distal end of the catheter body 100 so that the wire pulling 200 is fixedly connected to the distal end of the catheter body 100, and at least one end of the wire pulling 200 extends out of the proximal end of the catheter body 100. Among them, the distal end of the catheter body 100 refers to the end that extends into the body during the operation, and the proximal end of the catheter body 100 refers to the opposite end of the distal end. In addition, the definition of the proximal end and the distal end of other components in this embodiment is the same as the definition of the proximal end and the distal end of the catheter body 100, and this application will not be repeated in detail.

[0047] In this embodiment, part of the pull wire 200 is buried at the distal end of the catheter body 100, so that the fixed connection between the pull wire 200 and the distal end of the catheter body 100 is firm and reliable, effectively preventing the connection of the pull wire 200 from being loosened, and extending the service life, and at least one end of the pull wire 200 is extended from the proximal end of the catheter body 100, so that the bending amount of the catheter body 100 can be controlled by the pull wire 200. In addition, the pull wire 200 is buried at the distal end of the catheter body 100, which reduces the difficulty of the production process.

[0048] Exemplarily, the material of the pull wire 200 can be non-metallic materials such as polyamide (PA), polyethylene (PE), polypropylene (PP), polyethylene terephthalate plastic (PET) or liquid crystal polymer (LCP). The material is light, has good flexibility and tensile strength, has good controllability for the bending of the catheter body 100, and the pull wire 200 has a long service life.

[0049] Exemplarily, the material of the pull wire 200 can also be a metal material such as stainless steel, tungsten-rhenium alloy or nickel-titanium alloy, which has strong corrosion resistance and wear resistance, and the pull wire 200 has a long service life.

[0050] In some embodiments, Figure 1As shown, the catheter body 100 sequentially includes a bending section 110 and a reinforcement section 120 from the proximal end to the distal end. The hardness of the reinforcement section 120 is greater than that of the bending section 110. The distal end of the bending section 110 and the proximal end of the reinforcement section 120 are fused into one body. The wire-drawing cavity 101 extends to the fusion area between the bending section 110 and the reinforcement section 120, and a partial line segment of the wire 200 is buried in the fusion area between the bending section 110 and the reinforcement section 120. In this embodiment, since the hardness of the reinforcement section 120 is greater than that of the bending section 110, the deformation amount of the fusion area can be reduced, and the connection strength between the wire 200 and the catheter body 100 can be improved, so as to further increase the connection firmness between the wire 200 and the catheter body 100 and extend the service life of the bending catheter.

[0051] Exemplarily, the material of the bending section 110 includes, but is not limited to, polyamide (PA), polyether block polyamide (Pebax), high-density polyethylene (HDPE), or low-density polyethylene (LDPE), which has good flexibility and biocompatibility, facilitates the bending of the bending section 110, and effectively reduces the risk of infection and inflammation after the catheter body 100 enters the body.

[0052] Exemplarily, the material of the reinforcement section 120 includes, but is not limited to, polycaprolactam (PA12), polyurethane (PU), or high-density polyethylene (HDPE), which has higher hardness and rigidity and effectively ensures the firm connection between the wire 200 and the catheter body 100.

[0053] In some other embodiments, as Figure 2 shown, at least one knotting point 211 is provided on a partial line segment of the wire 200 buried in the distal end of the catheter body 100. The contact area between the wire 200 and the catheter body 100 can be increased, and the connection firmness between the wire 200 and the catheter body 100 can be further increased, and the service life of the bending catheter can be extended.

[0054] In a feasible implementation manner, while the catheter body 100 includes the bending section 110 and the reinforcement section 120, the wire 200 can be provided with at least one knotting point 211 to make the connection between the wire 200 and the catheter body 100 more firm and extend the service life of the bending catheter.

[0055] In this embodiment, referring to Figure 2 and Figure 3 shown, the catheter body 100 is circumferentially provided with an even number of wire-drawing cavities 101 at intervals. Two wire-drawing cavities 101 arranged at an interval of 180° are set as a group, and the bending direction and bending amount of the catheter body 100 can be more accurately controlled through the wire 200.

[0056] Exemplarily, two wire-drawing cavities 101 of the same group can be symmetrically arranged centered on the central axis of the catheter body 100 to ensure the compact structure of the catheter body 100.

[0057] Exemplarily, two groups of wire-drawing cavities 101 can be formed in the catheter body 100, that is, four wire-drawing cavities 101 are formed in the catheter body 100, enabling the catheter body 100 to be bent in four directions, namely front, back, left, and right. Of course, according to actual requirements, the wire-drawing cavities 101 can also be set to three groups, four groups or other arrays, so that the catheter body 100 can be bent in more directions.

[0058] In some embodiments, as Figure 2 shown, one wire 200 is threaded through two wire-drawing cavities 101 of the same group. Both ends of the wire 200 extend out of the proximal end of the catheter body 100, and the middle section 210 of the wire 200 is buried in the distal end of the catheter body 100. In this embodiment, the middle section 210 of the wire 200 is buried in the distal end of the catheter body 100, so that there is a sufficiently large contact area between the middle section 210 of the wire 200 and the catheter body 100, that is, there is a sufficiently large frictional force between the middle section 210 of the wire 200 and the catheter body 100, so that the middle section 210 of the wire 200 is fixedly connected to the distal end of the catheter body 100, and this connection is firm and reliable; the two wire-drawing cavities 101 of the same group are arranged at an interval of 180°, and one wire 200 is threaded through the two wire-drawing cavities 101 of the same group, that is, one end of the same wire 200 feeds the wire and the other end takes in the wire to realize the bending of the catheter body 100 in a certain direction. During the bending process, the pulling force of the wire 200 on the catheter body 100 is more uniform, effectively improving the stress distribution between the middle section 210 of the wire 200 and the catheter body 100, and further effectively preventing the connection between the wire 200 and the catheter body 100 from loosening and extending the service life of the bending catheter.

[0059] Exemplarily, the middle section 210 of the wire 200 can be buried in the catheter body 100 in a semi-circular shape to ensure a sufficiently large contact area between the middle section 210 of the wire 200 and the catheter body 100.

[0060] Exemplarily, when there are multiple knotting points 211 on the middle section 210 of the wire 200, the knotting points 211 can be evenly spaced or arranged in other arrangements, which is not limited in this application. When there is one knotting point 211 on the middle section 210 of the wire 200, the knotting point 211 can be located at the center of the middle section 210.

[0061] In other embodiments, the wires 200 are respectively threaded through the wire-drawing cavities 101. The distal ends of the wires 200 are buried in the distal end of the catheter body 100, and the proximal ends of the wires 200 extend out of the proximal end of the catheter body 100, which is convenient for the forming and manufacturing of the bending catheter.

[0062] In a feasible embodiment, as Figure 4 shown, the setting method in which the pulling wire 200 is buried at the distal end of the catheter body 100 can be replaced with a setting method in which the pulling wire 200 is welded to a pulling wire loop 300, and the pulling wire loop 300 is buried at the distal end of the catheter body 100. Specifically, the pulling wires 200 are arranged in one-to-one correspondence with the pulling wire cavities 101. Through holes 310 corresponding to the pulling wires 200 are formed in the circumferential portion of the pulling wire loop 300. The distal end of the pulling wire 200 passes through the corresponding through hole 310 from the outer ring surface of the pulling wire loop 300 and is welded to the inner ring surface of the pulling wire 200, so as to increase the contact area between the pulling wire 200 and the pulling wire loop 300, improve the firmness of the connection between the pulling wire 200 and the pulling wire loop 300, and can extend the service life of the deflectable catheter.

[0063] In this embodiment, referring to Figure 2 and Figure 3 shown, a transducer (not shown) may be provided at the distal end of the catheter body 100. The catheter body 100 is provided with a wiring channel 102 through which the wires of the transducer can pass, so as to facilitate wiring. Among them, the wires of the transducer can be FPC flexible flat cables.

[0064] Exemplarily, the wiring channel 102 can be opened at the center of the catheter body 100, and the pulling wire cavities 101 are arranged around the wiring channel 102, effectively ensuring the accuracy of the bending of the catheter body 100 by the pulling wire 200 and the structural compactness of the deflectable catheter.

[0065] Exemplarily, the cross-sectional shape of the wiring channel 102 is set to be circular, and there is still a certain gap after laying the wires, which is convenient for other designs.

[0066] Exemplarily, the cross-sectional shape of the wiring channel 102 is set to be cross-shaped, the fixation of the wires is more reliable, the bending and folding resistance of the catheter body 100 is increased, and it helps to improve the surgical accuracy. Among them, the pulling wire cavities 101 can be respectively opened at the four depressions on the outer periphery of the wiring channel 102, effectively reducing the diameter of the catheter body 100, making the structure of the deflectable catheter more compact and more suitable for extending into the body.

[0067] Of course, the cross-sectional shape of the wiring channel 102 can also be set to other shapes, which is not limited in this application.

[0068] In this embodiment, referring to Figure 3 shown, the catheter body 100 includes at least one layer of tube sleeve 130. Preferably, the catheter body 100 includes one to three layers of tube sleeves 130. In this embodiment, the design of the catheter body 100 with one layer of tube sleeve 130 facilitates the shaping of the catheter body 100; when the catheter body 100 includes multiple layers of tube sleeves 130, the catheter body 100 can have better flexibility suitable for bending.

[0069] Exemplarily, when the catheter body 100 includes two layers of sleeves 130, the cross-sectional shape of the wiring channel 102 can be set to a cross shape. Specifically, the wire-drawing cavity 101 and the wiring channel 102 are both opened on the inner-layer sleeve 130, effectively ensuring the structural compactness of the catheter body 100.

[0070] Exemplarily, when the catheter body 100 includes multiple layers of sleeves 130, the materials of the multiple layers of sleeves 130 can be the same or different, which is not limited in this application. Among them, taking the catheter body 100 including a bending section 110 and a reinforcing section 120 as an example, the bending section 110 can include at least one layer of sleeve 130, and the reinforcing section 120 can be a non-layered design. In this embodiment, the middle section 210 of the wire 200 can be buried between the sleeve 130 with the hardest material among the multiple layers of sleeves 130 and the reinforcing section 120 to ensure the connection strength between the middle section 210 of the wire 200 and the catheter body 100, further increasing the connection firmness between the middle section 210 of the wire 200 and the catheter body 100 and extending the service life of the bending catheter.

[0071] In this embodiment, referring to Figures 5 to 12 as shown, the bending catheter further includes an operating handle 400. The operating handle 400 is connected to the proximal end of the catheter body 100. A rotatable transmission member is provided on the operating handle 400. A wire-winding portion 401 is provided on the transmission member. The corresponding wire 200 is wound around the wire-winding portion 401. By rotating the transmission member, the feeding or retracting of the wire 200 is realized, and thus the bending function of the catheter body 100 is realized, which is convenient for operation.

[0072] Exemplarily, the wire-winding portion 401 can be configured as an annular groove to limit the wound wire 200.

[0073] In some embodiments, referring to Figure 5 and Figure 6 as shown, the transmission member is set as a gear member 410. The gear member 410 is provided in one-to-one correspondence with the wire-drawing cavity 101. A wire-winding portion is provided on the gear member 410. Among them, the gear members 410 are arranged at intervals along the circumferential direction of the operating handle 400. In this embodiment, by rotating the gear member 410, the feeding and retracting of the wire 200 in the wire-drawing cavity 101 corresponding to the gear member 410 are realized, and the gear members 410 corresponding to the remaining wire-drawing cavities 101 follow the movement under the action of the wire 200. In this embodiment, the annular groove can be directly provided on the circumferential portion of the gear member 410, or the gear member 410 is provided with a boss (not shown) along the axial direction, and the annular groove is provided on the circumferential portion of the boss.

[0074] Exemplarily, to ensure that the wire 200 is always taut and prevent the wire 200 from detaching from the wire-winding portion, a torsion spring can be connected to the gear member 410.

[0075] Exemplarily, for the convenience of rotating the gear member 410, a partial area of the gear member 410 protrudes from the operation handle 400.

[0076] In some embodiments, as Figures 7 to 12 shown, the transmission member is arranged as a screw 420, and a wire winding portion 401 is provided on the screw 420. By rotating the screw 420, the wire 200 in the corresponding wire pulling cavity 101 of the screw 420 can be wound and unwound.

[0077] Exemplarily, when the catheter body 100 is circumferentially provided with an even number of wire pulling cavities 101 at intervals, two wire pulling cavities 101 arranged at an interval of 180° are correspondingly arranged with two mutually meshing screws 420. Among them, as Figure 9 and Figure 10 shown, when the rotation directions of the two mutually meshing screws 420 are the same, the winding directions of the wires 200 in the corresponding two wire pulling cavities 101 on the corresponding wire winding portions 401 are opposite; as Figure 11 and Figure 12 shown, when the rotation directions of the two mutually meshing screws 420 are opposite, the winding directions of the wires 200 in the corresponding two wire pulling cavities 101 on the corresponding wire winding portions 401 are the same. In this embodiment, when one of the screws 420 is rotated, the other screw 420 rotates accordingly, so that while the wire winding portion 401 on one screw 420 winds the wire, the wire winding portion 401 on the other screw 420 feeds the wire, effectively preventing the situation that the two ends of the wire 200 wind or feed the wire simultaneously, and facilitating bending.

[0078] Specifically, one end of one of the two screws 420 protrudes from the operation handle 400 and is connected with a handwheel 430 to facilitate rotating the screw 420.

[0079] In a feasible implementation manner, the two mutually meshing screws 420 are arranged through a sleeve 440, and the sleeve 440 is fixed in the operation handle 400. Through the limitation of the sleeve 440, a stable meshing state is maintained between the two screws 420, and the screw 420 is prevented from moving along its own axial direction.

[0080] In a feasible implementation manner, a tension spring 450 is connected to the proximal end of the wire 200, and the tension spring 450 is wound around the wire winding portion 401. The tension spring 450 has the effect of compensating for the length of the wire 200 to prevent the situation that the wire 200 is overstressed.

[0081] Of course, the transmission member can also be in other structural forms, and the present application does not make any limitation.

[0082] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A bending catheter, characterized in that, include: The catheter body (100) is provided with a plurality of wire pulling cavities (101) spaced apart along the circumferential direction, each of the wire pulling cavities (101) extending along the axial direction of the catheter body (100) and penetrating the proximal end of the catheter body (100); The pull wire (200) is passed through the pull wire cavity (101), and a partial segment of the pull wire (200) is buried in the distal end of the catheter body (100) so that the pull wire (200) is fixedly connected to the distal end of the catheter body, and at least one end of the pull wire (200) extends out of the proximal end of the catheter body (100).

2. The bending catheter according to claim 1, wherein The catheter body (100) includes a bending adjustment section (110) and a reinforcement section (120) from the proximal end to the distal end, the hardness of the reinforcement section (120) is greater than the hardness of the bending adjustment section (110), the distal end of the bending adjustment section (110) and the proximal end of the reinforcement section (120) are fused into one, the pull wire cavity (101) extends to the fusion area between the bending adjustment section (110) and the reinforcement section (120), and part of the pull wire (200) is buried in the fusion area between the bending adjustment section (110) and the reinforcement section (120).

3. The bending catheter according to claim 2, wherein, The material of the bending adjustment section (110) is polyamide, polyether block polyamide, high-density polyethylene or low-density polyethylene; and / or The material of the reinforcement section (120) is polylaurolactam, polyurethane or high-density polyethylene.

4. The bending catheter according to claim 1, characterized in that, The catheter body (100) is provided with an even number of the wire pulling cavities (101) spaced apart along the circumferential direction, two of the wire pulling cavities (101) are provided as a group, and the two wire pulling cavities (101) in the same group are symmetrically arranged with the central axis of the catheter body (100) as the center.

5. The bending catheter according to claim 1, characterized in that, The catheter body (100) is provided with an even number of the wire pulling cavities (101) spaced apart along the circumferential direction, and two of the wire pulling cavities (101) spaced apart at 180° are arranged as a group; wherein, A pull wire (200) is passed through the two pull wire cavities (101) of the same group, both ends of the pull wire (200) are extended out of the proximal end of the catheter body (100), and the middle section (210) of the pull wire (200) is buried in the distal end of the catheter body (100); or The pull wires (200) are respectively passed through the pull wire cavities (101), the distal ends of the pull wires (200) are buried in the distal ends of the catheter body (100), and the proximal ends of the pull wires (200) are extended out of the proximal ends of the catheter body (100).

6. The bending catheter according to claim 1, characterized in that, The portion of the pull wire (200) buried at the distal end of the catheter body (100) is provided with at least one knotting point (211).

7. The bending catheter according to claim 1, characterized in that, The catheter body (100) is provided with a wiring channel (102) through which the conductor wire of the transducer can pass, and the cross-sectional shape of the wiring channel (102) is set to be circular or cross-shaped.

8. The deflectable catheter according to claim 1, wherein, The catheter body (100) comprises at least one layer of sheath (130).

9. The bending catheter according to claim 1, wherein It further includes an operating handle (400). The operating handle (400) is connected to the proximal end of the catheter body (100). A rotatable transmission member is provided on the operating handle (400). A wire winding portion (401) is provided on the transmission member, and the corresponding wire pulling line (200) is wound around the wire winding portion (401).

10. The bent catheter according to claim 9, wherein The transmission member is arranged as a gear member (410). The gear member (410) is arranged in one-to-one correspondence with the wire pulling cavity (101), and the wire winding portion (401) is provided on the gear member (410); or The transmission member is arranged as a screw rod (420). The wire winding portion is provided on the screw rod (420). The catheter body (100) is circumferentially provided with an even number of the wire pulling cavities (101) at intervals, and two of the wire pulling cavities (101) arranged at an interval of 180° are arranged in one-to-one correspondence with two mutually meshing screw rods (420).

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