A pullback bending catheter and method of assembling the same

Abstract

The application discloses a traction bending-adjustable catheter and an assembling method thereof, and relates to the technical field of interventional medical devices. The traction bending-adjustable catheter comprises a functional tube segment, a transmission tube segment, a handle and a plurality of groups of pull wires. The functional tube segment comprises a probe and a transparent tube sleeved outside the probe. The transmission tube segment is connected to the proximal end of the functional tube segment and is provided with an even number of threading cavities, and each threading cavity penetrates through the length direction of the transmission tube segment and is separated from each other. The handle is connected to the proximal end of the transmission tube segment. Any group of pull wires has one common end and two free ends. The common end is embedded in a connecting table between the transparent tube and the transmission tube segment, and the fixed position of the common end on the connecting table is distributed in a staggered manner with the threading cavities. The two free ends of any group of pull wires are connected to the handle through different threading cavities, and any free end is independently driven by the handle, so that the process convenience, the assembling damagelessness and the bending durability are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of interventional medical devices, and more particularly to a traction bending catheter and an assembling method thereof. BACKGROUND

[0002] At present, many interventional diagnosis catheters and treatment catheters need to realize directional bending. Specifically, a pull wire is generally configured inside the catheter, the proximal end of the pull wire is fixed at the handle, and the distal end of the pull wire is fixedly connected to the bending segment at the distal end of the catheter. The handle is used to control the individual pull wires to realize the directional bending of the catheter.

[0003] Correspondingly, in the catheter manufacturing process, special processes and methods are needed to realize the fixation of the pull wire, such as using a pull wire welding point fixation or connecting the pull wire with a specially designed fixation member arranged at the distal end of the catheter. However, the welding point fixation method has high process requirements, and is prone to insufficient connection strength of the distal end of the pull wire, thereby causing the pull wire to be pulled off during repeated bending. The arrangement of the fixation member increases the hard segment length of the pull wire connection part of the catheter and the outer diameter of the catheter. In addition, the fixation member needs to be fixed by high-temperature welding, which is prone to deformation or performance damage of the functional components at the distal end of the catheter.

[0004] In summary, how to improve the process simplicity, assembly damagelessness and bending durability of the catheter is a problem to be solved by the technical personnel in the field at present. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a traction bending catheter with high process simplicity, assembly damagelessness and bending durability.

[0006] Another purpose of the present application is to provide an assembling method applied to the traction bending catheter.

[0007] In order to achieve the above purpose, the present application provides the following technical solutions:

[0008] A traction bending catheter comprises:

[0009] a functional tube segment comprising a probe and an energy transmission tube sleeved outside the probe;

[0010] a transmission tube segment connected to the proximal end of the functional tube segment, provided with an even number of wire passing cavities, and each wire passing cavity penetrates along the length direction of the transmission tube segment and is separated from each other;

[0011] a handle connected to the proximal end of the transmission tube segment;

[0012] A plurality of groups of pull wires, any one of the groups of pull wires having a common end and two free ends, the common end being embedded in a connecting platform between the energy-transmissive tube and the transmission tube segment, and the common end being distributed at a fixed position on the connecting platform that is staggered with the threading cavities, the two free ends of any one of the groups of pull wires being connected to the handle through different threading cavities, and any one of the free ends being independently driven by the handle.

[0013] In some embodiments, the transmission tube segment is provided with a central cavity for accommodating a communication core connected to the probe, and a plurality of the threading cavities are distributed around the central cavity.

[0014] The connecting platform is arranged at an angle with the threading cavities, and any one of the groups of pull wires is bent at the connecting platform to extend into the threading cavities.

[0015] In some embodiments, the two free ends of the pull wires are respectively threaded into a first cavity and a second cavity.

[0016] The common end of the pull wires is fixed between the first cavity and the second cavity, and each of the pull wires is distributed at a staggered position on the connecting platform; or the common end of the pull wires is fixed on the opposite side of the first cavity and the second cavity, any one of the pull wires is arranged in a semi-enclosed manner around the communication core on the connecting platform, and each of the pull wires is distributed in a crossing manner on the connecting platform.

[0017] In some embodiments, the connecting platform is provided with a mounting groove for accommodating the pull wires, and the mounting groove is arranged around the central cavity.

[0018] In some embodiments, the common end of the pull wires is formed by an anti-disengagement structure, and the maximum width of the threading cavities is smaller than the width of the anti-disengagement knot.

[0019] In some embodiments, the connecting platform comprises a hardened tube segment and a transition tube segment, the hardened tube segment and the transition tube segment are sequentially arranged between the transmission tube segment and the energy-transmissive tube, the hardened tube segment is provided with a passage that is in communication with the threading cavities and the central cavity, the transition tube segment is provided with a cavity that is in communication with the central cavity, and the common end is embedded between the hardened tube segment and the transition tube segment.

[0020] In some embodiments, the hardness of the hardened tube segment is greater than the hardness of the transmission tube segment and the hardness of the energy-transmissive tube, and the hardness of the transition tube segment is between the hardness of the hardened tube segment and the hardness of the energy-transmissive tube.

[0021] In some embodiments, the probe is an ultrasonic probe, the energy-transmissive tube is an acoustic-transmissive hose, and the handle pulls the pull wires in the threading cavities to drive the transmission tube segment to adjust the imaging field of view of the ultrasonic probe.

[0022] An assembly method of a traction bending catheter, applied to the traction bending catheter of any one of the preceding claims, the assembly method comprising:

[0023] Assembling the probe inside the energy-transmitting tube;

[0024] Exposing the first free end of the pull wire to the proximal end of the transmission tube segment, threading the second free end of the pull wire into the first lumen to the distal end of the transmission tube segment, threading the second free end of the pull wire into the second lumen and exposing it to the proximal end of the transmission tube segment, and knotting the pull wire at the distal end of the transmission tube segment to form a common end;

[0025] Embedding the common end in the connecting platform between the energy-transmitting tube and the transmission tube segment;

[0026] Connecting the first free end and the second free end of the pull wire to the handle, respectively.

[0027] In some embodiments, a stiffening tube segment is connected to the distal end of the transmission tube segment;

[0028] A transition tube segment is connected to the proximal end of the functional tube segment;

[0029] Exposing the first free end of the pull wire to the proximal end of the transmission tube segment, threading the second free end of the pull wire into the first lumen to the distal end of the stiffening tube segment, knotting the pull wire at the distal end of the stiffening tube segment to form a common end, and then threading the second free end into the second lumen and exposing it to the proximal end of the transmission tube segment;

[0030] Fusing the stiffening tube segment and the transition tube segment to form the connecting platform, and embedding the common end in the connecting platform.

[0031] In some embodiments, before embedding the common end in the connecting platform between the energy-transmitting tube and the transmission tube segment, the method comprises:

[0032] Pulling the common end of the pull wire to the opposite side of the first lumen and the second lumen, and then installing a communication core in the central lumen, so that the pull wire is arranged around the communication core at the distal end of the transmission tube segment.

[0033] In the present application, the traction bending catheter is along the length direction, and the distal end is a functional tube section, wherein the probe is a device capable of emitting and recovering detection signals to realize in-vivo detection imaging, and the corresponding energy-transparent tube is a soft tube through which the probe emits signals, and the probe is arranged inside the energy-transparent tube to protect the probe, and the energy-transparent tube is in contact with the patient through the outer surface, so that the traction bending catheter can be inserted into the patient's body and realize imaging through the probe detection, and the middle position of the length of the traction bending catheter is a transmission tube section for inserting the probe cable and the pull wire, and the proximal end of the traction bending catheter is a handle which can control the traction bending catheter of the present application to realize steering during the process of traveling in the complex physiological tissue environment such as the heart.

[0034] The beneficial effect is that the number of threading cavities opened in the transmission tube section is even, the threading cavities penetrate along the length direction of the transmission tube section, one end of the threading cavity is opened at the distal end face of the transmission tube section, and the other end is opened at the proximal end face of the transmission tube section, and correspondingly, a group of pull wires are arranged in U shape or V shape on the distal end face of the transmission tube section, and the two parts of the pull wires pass through two independent threading cavities.

[0035] Since each group of pull wires in the several groups of pull wires is a complete and continuous pull wire, and is folded at the distal end of the transmission tube section, and since the common end is directly embedded in the connecting table, compared with the related art, the traction bending catheter in the present application has the advantages of convenient assembly and can ensure the regulation and control of the bending of the catheter in different directions, and the direct embedding of the common end does not require the use of customized fixing parts, which is beneficial to shorten the length of the hard segment of the pull wire connection part and reduce the outer diameter of the catheter, and the process is simple, the assembly is lossless, the bending is durable, the stress change is small, and the bending ability is high. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creating any creative labor.

[0037] Figure 1 The overall structure schematic diagram of the specific embodiment provided by the present application;

[0038] Figure 2 The local structure schematic diagram of the specific embodiment provided by the present application;

[0039] Figure 3 The local structure sectional view of the specific embodiment provided by the present application;

[0040] Figure 4Another partial structural sectional view of the specific embodiment provided by the present application;

[0041] Figure 5 For Figure 4 A-A in the middle of the schematic Figure 1 ;

[0042] Figure 6 Schematic diagram of the double-group pull wire non-crossing state of the specific embodiment provided by the present application;

[0043] Figure 7 For Figure 4 A-A in the middle of the schematic Figure 2 ;

[0044] Figure 8 Schematic diagram of the double-group pull wire double-side crossing state of the specific embodiment provided by the present application;

[0045] Figure 9 Schematic diagram of another angle of the double-group pull wire double-side crossing state of the specific embodiment provided by the present application;

[0046] Figure 10 For Figure 4 A-A in the middle of the schematic Figure 3 ;

[0047] Figure 11 For Figure 4 A-A in the middle of the schematic Figure 4 ;

[0048] Figure 12 For Figure 4 A-A in the middle of the schematic Figure 5 .

[0049] The reference signs include:

[0050] 1-function tube segment; 11-probe; 12-energy transmission tube;

[0051] 2-transmission tube segment; 201-threading cavity; 201a-first cavity; 201b-second cavity; 202-central cavity; 21-bending adjustment tube segment; 22-non-bending main tube segment; 23-connection tube segment;

[0052] 3-connection table; 31-hardened tube segment; 32-transition tube segment;

[0053] 4-pull wire; 41-anti-drop knot;

[0054] 5-communication core;

[0055] 6-handle; 61-outer layer rotating mechanism; 62-inner layer bending control mechanism; 63-handle main body;

[0056] 7-wire protection sleeve;

[0057] 8-connection seat. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0059] In the specific embodiments, the distal end refers to the part of the corresponding component far away from the operator, usually the end of the component entering the patient's body or the surgical area, and the proximal end refers to the part of the corresponding component close to the operator, usually the end held or operated by the operator. For a single component, the end closer to the operator is the proximal end, and the end farther away from the operator is the distal end. In addition, in the present application, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting", "fixing", "communicating" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] The core of the present application is to provide a traction bending catheter with high process simplicity, assembly losslessness and bending durability. Another core of the present application is to provide an assembly method applied to the traction bending catheter.

[0061] The present application provides a traction bending catheter, which comprises a functional tube segment 1, a transmission tube segment 2, a handle 6 and a plurality of groups of pull wires 4 (one group or more than one group of pull wires 4); wherein the functional tube segment 1 comprises a probe 11 and an energy-transmitting tube 12 sleeved outside the probe 11; the transmission tube segment 2 is connected to the proximal end of the functional tube segment 1, and is provided with an even number of threading cavities 201, and each threading cavity 201 penetrates along the length direction of the transmission tube segment 2 and is separated from each other; the handle 6 is connected to the proximal end of the transmission tube segment 2; any group of pull wires 4 has a common end and two free ends, the common end is embedded in a connecting table 3 between the energy-transmitting tube 12 and the transmission tube segment 2, and the fixed position of the common end on the connecting table 3 is distributed away from the threading cavities 201, and the two free ends of any group of pull wires 4 are connected to the handle 6 through different threading cavities 201, and any free end is independently driven by the handle 6.

[0062] Reference Figures 1-3The traction bending catheter is shown along the length direction, and the left end is a functional tube segment 1, wherein a probe 11 is a device capable of emitting and recovering detection signals to achieve in-vivo detection imaging, and a transparent tube 12 is a soft tube through which the probe 11 emits signals, and has an internal cavity with a circular or rectangular cross-sectional shape, and the probe 11 is arranged in the internal cavity of the transparent tube 12 to protect the probe 11, and the external surface of the transparent tube 12 contacts the patient, so that the traction bending catheter can be inserted into the patient's body and detected by the probe 11 to achieve imaging, such as ultrasonic imaging or OCT imaging, and the middle of the length of the traction bending catheter is a transmission tube segment 2 for inserting a probe 11 cable and a pull wire 4, and the right end of the traction bending catheter is a handle 6 which cooperates with the pull wire 4 to control the traction bending catheter to achieve steering during the process of traveling in the complex physiological tissue environment of the heart.

[0063] Reference Figure 6 , Figure 8 and Figure 9 The number of the wire passing cavities 201 in the transmission tube segment 2 is even, and the wire passing cavities 201 penetrate along the length direction of the transmission tube segment 2, and one end of the wire passing cavities 201 is open at the left end face of the transmission tube segment 2, and the other end is open at the right end face of the transmission tube segment 2, and a group of pull wires 4 are arranged in a U shape or a V shape on the distal end face of the transmission tube segment 2, and the two parts of the pull wires 4 pass through two independent wire passing cavities 201.

[0064] The common end of the pull wire 4 is embedded in the connection table 3 between the left end of the transmission tube segment 2 and the functional tube segment 1, and the connection table 3 is a structure for connecting the left end of the transmission tube segment 2 and the right end of the functional tube segment 1, and the pull wire 4 is fixed by embedding the common end in the connection table 3, and since the two wire passing cavities 201 in which the two parts of the pull wire 4 are inserted are arranged at intervals, the parts of the two parts of the pull wire 4 that extend from the ports of the wire passing cavities 201 at the left end of the transmission tube segment 2 need to extend close to each other to be connected or closed, so that the fixed position of the common end of the pull wire 4 on the connection table 3 is distributed away from the wire passing cavities 201.

[0065] It should be noted that the type of the connecting table 3 is not limited, as long as the fixed end of the pull wire 4 can be embedded, for example, the connecting table 3 can have two pipe sections, the fixed end of the pull wire 4 is located between the two pipe sections, and the two pipe sections are connected by bonding or welding; or the connecting table 3 is a molten mixture generated during the process of fixing the transmission pipe section 2 and the energy transmission pipe 12 by fusion welding, and the fixed end of the pull wire 4 is wrapped in the molten mixture, so that the common end of the pull wire 4 does not need to be designed and machined to be fixed; or the connecting table 3 is a structure for bonding between the transmission pipe section 2 and the energy transmission pipe 12.

[0066] The two ends of the pull wire 4 located outside the right end of the transmission pipe section 2 are free ends or open ends, and the free ends of the pull wire 4 are connected to the handle 6, so that the position of the pull wire 4 can be positioned by controlling the two free ends of the pull wire 4. When one pull wire 4 is pulled, the catheter bends in the direction of the pull wire 4. Since the common end is embedded in the connecting table 3, even if one of the free ends of the pull wire 4 and the pull wire 4 on that side are pulled, the pull wire 4 on the other side will not move to the pull wire 4 on that side, so the control of the bending of each free end of the pull wire 4 is independent of each other.

[0067] Generally, the part of the bending catheter connected to the distal end of the pull wire 4 (i.e. the connecting table 3 of the present application) is more beneficial to the flexibility of the distal end of the catheter if a shorter hard section is used, which has better pushing ability to pass through the tortuous tissue. At the same time, the shorter hard section can more directly and quickly transmit the force when the pull wire 4 is pulled, so that the angle and shape of the bending can be more accurately controlled to meet the requirements of the positioning accuracy of the catheter during the operation. Therefore, the above can shorten the required hard section, i.e. the connecting table 3 is shorter, and the connection strength of the pull wire 4 and the connecting table 3 is better.

[0068] Since each group of pull wires 4 is a complete and continuous pull wire 4, and the common end is directly embedded in the connecting table 3, compared with the related art, the bending catheter in the present application has the advantages of convenient assembly and the ability to control the bending of the catheter in different directions, and the direct embedding of the common end does not require the use of custom fixing parts, which is beneficial to shorten the length of the hard section of the pull wire 4 connection part and reduce the outer diameter of the catheter. The process is simple, the assembly is lossless, the bending is durable, the stress change is small, and the bending ability is high.

[0069] It can be understood that the drawings of the present application are more specifically shown in two groups or more than two groups of pull wires 4 to illustrate the implementation in more complex situations, but the present application can also be applied to the case of only one group of pull wires 4, and accordingly, it can be applied to bending in two directions (such as forward and backward bending or left and right bending), for example, Figure 12The application also does not exclude the combination of the pull wire 4 bending adjustment and other bending adjustment modes to realize multi-directional bending adjustment, such as the combination of the bidirectional bending adjustment mode shown in Figure 12 and other modes to realize four-directional bending adjustment.

[0070] In some embodiments, the transmission pipe section 2 is provided with a central cavity 202 for accommodating the communication core 5 connected with the probe 11, and a plurality of threading cavities 201 are distributed around the central cavity 202; the connecting table 3 is arranged at an angle with the threading cavities 201, and any group of pull wires 4 is bent at the connecting table 3 to extend into the threading cavities 201.

[0071] Reference is made to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 , the transmission pipe section 2 is provided with a central cavity 202 and the above-mentioned threading cavities 201 which are independent of each other, the central cavity 202 and the threading cavities 201 both extend along the length direction of the transmission pipe section 2 and penetrate through, and the central cavity 202 is located at the central position of the transmission pipe section 2, while the several threading cavities 201 are arranged around the central cavity 202, wherein the communication core 5 is inserted into the central cavity 202, and the cross-sectional shape of the communication core 5 can be circular or rectangular, etc., to connect the probe 11 to meet its working needs, and the pull wires 4 are inserted into the several threading cavities 201 to meet the bending adjustment needs of the functional pipe section 1. In this embodiment, the arrangement mode of the central cavity 202 and the several threading cavities 201 is beneficial to enhance the bending control precision and stability of the traction bending catheter.

[0072] In addition, as mentioned above, the threading cavities 201 extend along the length direction of the transmission pipe section 2, while the connecting table 3 is a disc-shaped structure formed by the adhesive welding connection between the left end of the transmission pipe section 2 and the right end of the functional pipe section 1, and the expansion direction thereof towards the periphery has a non-zero included angle with the length direction of the threading cavities 201 and covers the threading cavities 201 at the left end opening of the transmission pipe section 2, and the structure of any group of pull wires 4 located inside the connecting table 3 needs to be bent relative to the length direction of the threading cavities 201, i.e. to extend along the width direction of the catheter, so that the two parts of the pull wire 4 threaded in the two threading cavities 201 can be closed or connected to form a common end, and the structure of the group of pull wires 4 located inside the connecting table 3 extends along the curved or straight segment of the threading cavities 201 in which the two free ends of the group of pull wires 4 are inserted, while the free ends of the pull wires 4 extend along the length direction of the threading cavities 201 and are connected with the handle 6.

[0073] In some embodiments, the two free ends of the pull wire 4 are respectively inserted into the first lumen 201a and the second lumen 201b, and the common end of the pull wire 4 is fixed between the first lumen 201a and the second lumen 201b, and each pull wire 4 is distributed on the connecting platform 3 in a staggered manner; or the common end of the pull wire 4 is fixed on the opposite side of the first lumen 201a and the second lumen 201b, and any pull wire 4 is arranged around the communication core 5 on the connecting platform 3 in a half-enclosed manner, and each pull wire 4 is distributed on the connecting platform 3 in a staggered manner.

[0074] In the embodiment, the threading lumen 201 in which the partial line segment between the common end and one free end of a group of pull wires 4 is inserted is defined as the first lumen 201a, and the threading lumen 201 in which the partial line segment between the common end and the other free end of the group of pull wires 4 is inserted is defined as the second lumen 201b, and the transmission pipe segment 2 is provided with at least one group of the above-mentioned first lumen 201a and the second lumen 201b.

[0075] Optionally, as shown in Figure 5 and Figure 6 illustrated, the pull wire 4 can be arranged in a non-crossing manner. Specifically, the first lumen 201a and the second lumen 201b for inserting a group of pull wires 4 are located on the same side of the central cavity 202, and in cooperation, the common end of the same group of pull wires 4 is located in the region between the first lumen 201a and the second lumen 201b in which it is inserted, and in particular, the common end of a group of pull wires 4 and the first lumen 201a and the second lumen 201b in which it is inserted are located on the same side of the central cavity 202, and the transmission pipe segment 2 has a plurality of threading lumens 201 arranged in sequence around one turn of the central cavity 202, and the first lumen 201a and the second lumen 201b in which a group of pull wires 4 are inserted are adjacent to each other among the plurality of threading lumens 201 arranged around one turn of the central cavity 202, so that each pull wire 4 is distributed on the connecting platform 3 in a staggered manner.

[0076] Optionally, as shown in Figure 7 , Figure 8 and Figure 9It is illustrated that the pull wires 4 can be arranged in a double-sided crossing manner. Specifically, the first cavity 201a and the second cavity 201b for inserting a group of pull wires 4 are located on the same side of the central cavity 202. However, the structure of the group of pull wires 4 located inside the connecting table 3 is arranged in a half-encircling manner around the communication core 5, that is, the part of the line segment of the group of pull wires 4 passing through the first cavity 201a and the part of the line segment of the group of pull wires 4 passing through the second cavity 201b need to extend along the width direction of the guide tube to the other side of the central cavity 202 after extending out of the port at the distal end of the transmission tube segment 2, so as to connect the first cavity 201a and the second cavity 201b on the opposite side of the group of pull wires 4. Then, the common end of the group of pull wires 4 is fixed on the opposite side of the first cavity 201a and the second cavity 201b. Since the structure of the group of pull wires 4 located inside the connecting table 3 is arranged in a half-encircling manner around the communication core 5 (the group of pull wires 4 in the connecting table 3 is in a bent state and the central angle of the arc segment is not less than 180 degrees), the first cavity 201a and the second cavity 201b inserted by the same group of pull wires 4 are arranged in an adjacent or spaced manner by at least one threading cavity 201. The structure of each pull wire 4 inside the connecting table 3 is arranged in a double-sided crossing manner. Since the group of pull wires 4 passes around the communication core 5, the force conducted by the pull wire 4 can be decomposed into two directions, that is, the transverse direction and the longitudinal direction. The force value of the pull wire 4 in a single direction is effectively reduced. Thus, the pull wire 4 can withstand greater tension without being pulled off, and the fixing strength of the common end of the pull wire 4 can be improved.

[0077] It should be noted that Figure 9 In order to facilitate understanding of the winding manner of the pull wire 4 arranged in a double-sided crossing manner, two groups of pull wires 4 are processed and embodied in a manner that the outer diameter of one group of pull wires 4 is greater than the outer diameter of the other group of pull wires 4. It should be noted that the present application does not limit the outer diameters of the groups of pull wires 4. The outer diameters of the groups of pull wires 4 can be the same or different. Even part of the groups of pull wires 4 can have the same outer diameter, and the remaining groups of pull wires 4 can have different outer diameters. The similarities and differences in the physical properties of the pull wires 4 cannot be understood as being out of the protection scope of the present application.

[0078] In some embodiments, further arrangement, no matter whether the structure of the pull wire 4 inside the connecting table 3 is arranged in a double-sided crossing manner or a non-crossing manner, the common end of the pull wire 4 is located on the symmetry axis of the two free ends of the group of pull wires 4 inserted into the first cavity 201a and the second cavity 201b at the port at the left end (i.e., the distal end) of the transmission tube segment 2. Specifically, the group of pull wires 4 extends out of the first cavity 201a and is arranged on the connecting table 3. The extension from the first cavity 201a to the common end is a segment a. The extension from the second cavity 201b to the common end is a segment b. As shown in FIG. 1, Figure 5 、 Figure 6 、 Figure 7 and Figure 8As shown, the lengths of the a section and the b section are equal in the initial state (before the bending is started), and the a section and the b section are symmetric to the line connecting the common end and the axis in the initial state, so as to ensure that each structure in the connecting table has good symmetry and stability.

[0079] It should be noted that the arrangement of the plurality of groups of pull wires 4 is not limited to the above optional manner, and as long as the fixing and bending requirements of the pull wires 4 can be met, for example, in some embodiments, a through-cavity 201 is arranged between the first cavity 201a and the second cavity 201b through which a group of pull wires 4 passes, and optionally, as shown in Figure 10 As shown, at least two adjacent groups of pull wires 4 on the same side of the central cavity 202 are distributed in a cross distribution on one side close to each other, and at this time, each structure of the pull wires 4 inside the connecting table 3 is distributed in a single-sided cross manner; or, as shown in Figure 11 As shown, each structure of the pull wires 4 inside the connecting table 3 is distributed in a double-sided cross manner, and the above double-sided cross distribution refers to the cross of the line segments on both sides of the common end of one group of pull wires 4 and the line segments on both sides of the common end of at least another group of pull wires 4.

[0080] In some embodiments, the connecting table 3 is provided with a mounting groove for accommodating the pull wires 4, and the mounting groove is arranged around the central cavity 202.

[0081] Reference Figure 3 , Figure 4 , Figure 5 and Figure 7 It is explained that in order to accommodate the pull wires 4 and achieve the fixing of the common end, the connecting table 3 has a mounting groove inside to better ensure the accuracy of the fixed position of the common end, and the port of the through-cavity 201 at the distal end of the transmission pipe section 2 is opened in the mounting groove, so that the common end of the pull wire 4 and the part of the line segment from the common end to the port of the through-cavity 201 at the distal end of the transmission pipe section 2 can be in a state of being threaded through the mounting groove of the connecting table 3, and since the plurality of through-cavities 201 are arranged around the central cavity 202, the connecting line segment of the pull wire 4 having the common end between the two through-cavities 201 threaded by itself is arranged around the central cavity 202, and then the mounting groove for accommodating the above connecting line segment of the pull wire 4 is also arranged around the central cavity 202.

[0082] In some embodiments, the common end of the pull wire 4 is composed of an anti-escape knot 41, and the maximum width of the through-cavity 201 is less than the width of the anti-escape knot 41.

[0083] Reference Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9The common end of the pull wire 4 is provided with a knot 41 for preventing the pull wire 4 from being pulled out. The knot 41 can be a single knot, a double knot, or an eight-shaped knot. The knot 41 can also be achieved by using adhesive or an attachment member. The knot 41 can prevent the common end of the pull wire 4 from being pulled into the threading cavity 201 when the pull wire 4 is bent. The maximum width of the knot 41 is less than the outer diameter of the pipe wall at the position of the knot 41, so that the knot 41 does not protrude outside the pipe.

[0084] In some embodiments, the connecting table 3 includes a hardened pipe segment 31 and a transition pipe segment 32. The hardened pipe segment 31 and the transition pipe segment 32 are sequentially arranged between the transmission pipe segment 2 and the energy transmission pipe 12. The hardened pipe segment 31 is provided with passages that are in communication with the threading cavity 201 and the central cavity 202. The transition pipe segment 32 is provided with a cavity that is in communication with the central cavity 202. The common end is embedded between the hardened pipe segment 31 and the transition pipe segment 32.

[0085] Reference Figure 3 The connecting table 3 for connecting the transmission pipe segment 2 and the functional pipe segment 1 is composed of two pipe segments. The hardened pipe segment 31 is arranged close to and connected to the transmission pipe segment 2. The transition pipe segment 32 is arranged close to and connected to the functional pipe segment 1. The length of the transition pipe segment 32 is in the range of 1-5 mm. The transition pipe segment 32 is connected to the end of the hardened pipe segment 31 close to the transition pipe segment 32. The hardened pipe segment 31 is provided with passages that are arranged in the same way as the central cavity 202 and the threading cavity 201 of the transmission pipe segment 2. One of the passages in the central position of the hardened pipe segment 31 is in communication with the central cavity 202 of the transmission pipe segment 2, so that the communication core 5 can pass through. The remaining passages are arranged around the passage in the central position and are in communication with the corresponding threading cavity 201 of the transmission pipe segment 2, so that the pull wire 4 can pass through. The transition pipe segment 32 is provided with a passage in the central position, so that the communication core 5 can pass through the passage in the central position of the hardened pipe segment 31 and the central cavity 202 of the transmission pipe segment 2. The pull wire 4 cannot pass through the transition pipe segment 32. The common end is embedded between the hardened pipe segment 31 and the transition pipe segment 32.

[0086] In the above embodiments, the hardness of the hardened pipe segment 31 is greater than the hardness of the transmission pipe segment 2 and the hardness of the energy transmission pipe 12. The hardness of the transition pipe segment 32 is between the hardness of the hardened pipe segment 31 and the hardness of the energy transmission pipe 12. In the structure shown in FIG. 4, the hardness of the energy transmission pipe 12, the transition pipe segment 32, and the hardened pipe segment 31 arranged from right to left increases in order. The hardness of the hardened pipe segment 31 is also greater than the hardness of the transmission pipe segment 2. Figure 3 In the structure shown in FIG. 4, the hardness of the energy transmission pipe 12, the transition pipe segment 32, and the hardened pipe segment 31 arranged from right to left increases in order. The hardness of the hardened pipe segment 31 is also greater than the hardness of the transmission pipe segment 2.

[0087] In some embodiments, the transition pipe segment 32 is a pipe segment structure connected to the proximal end of the energy-transparent pipe 12 before the connection table 3 is welded to the energy-transparent pipe 12, which is particularly suitable for the scheme in which the several groups of pull wires 4 are arranged in a double-sided cross manner inside the connection table 3, because even in the extreme case that the pull wires 4 are pulled out or slide during the bending adjustment, each group of pull wires 4 is arranged around the communication core 5, and since the communication core 5 can share part of the pulling force of the pull wires 4, the pull wires 4 will not be broken, and the bending control will not fail. That is, the present application achieves the fixation of the distal end of the pull wire 4 by embedding the common end of each group of pull wires 4 into the connection table 3, and by arranging the common end around the communication core 5 in a semi-enclosed manner (U-shaped, V-shaped, etc.) at the distal end of the catheter, it helps to maintain the state of each group of pull wires 4 around the communication core 5 when the distal end embedding structure (i.e., the connection table 3) is damaged and the common end position cannot be maintained in a fixed state, so that the pull wires 4 are not easily broken, and the bending adjustment function can still be achieved, thereby achieving double protection of the bending control resistance and safety.

[0088] In other embodiments, the transition pipe segment 32 is a molten structure formed during the welding process of the hardening pipe segment 31 of the connection table 3 to the energy-transparent pipe 12, and the transition pipe segment 32 is a mixed structure formed by the mixed cooling of the part of the material of the energy-transparent pipe 12 after melting and the part of the material of the hardening pipe segment 31 after melting. The energy-transparent pipe 12 needs to have a low hardness to ensure good energy transmission, and the hardening pipe segment 31 needs to have a high hardness to ensure that the pull wires 4 do not pull out or slide during the bending adjustment, so the hardness of the transition pipe segment 32 formed by the partial melting of the energy-transparent pipe segment and the hardening pipe segment 31 is between the hardness of the energy-transparent pipe segment and the hardening pipe segment 31.

[0089] The above connecting table 3 setting promotes the hardness gradient setting of the connecting table 3 to the energy transmission tube 12, which is conducive to guaranteeing the compliance of the distal end of the catheter, especially avoiding the bending caused by the sudden change of hardness in the process of bending adjustment at an unexpected place (such as the connecting place of the connecting table 3 and the energy transmission tube 12), guaranteeing that the distal end of the catheter is in accordance with the expected integrity and has better bending control performance. When the energy transmission tube 12 is selected to be made of a relatively soft material, and there is a higher requirement for the regularity of the shape of the energy transmission tube 12, the connecting table 3 preferably includes a transition tube segment 32 and a hardening tube segment 31 with different hardness. In this way, the length of the hard segment of the connecting table 3 is shortened, which is conducive to guaranteeing the pushability and the accuracy of the bending adjustment. On the other hand, the hardening tube segment 31 and the energy transmission tube 12 are directly fused, and the corresponding melting temperature difference is also large due to the difference in hardness. Therefore, the temperature needs to be raised above the melting temperature of the hardening tube segment 31, so that the melting degree of the energy transmission tube 12 is intensified and it will be difficult to maintain the regularity of its own shape. The setting of the transition tube segment 32 avoids the problem of directly fusing the hardening tube segment 31 and the energy transmission tube 12. The first fusion of the transition tube segment 32 and the energy transmission tube 12 will reduce the influence on the shape of the energy transmission tube 12 due to the smaller difference in hardness and melting temperature between the two. The second fusion of the transition tube segment 32 and the hardening tube segment 31 will also facilitate the embedding and fixing of the common end in them due to the smaller difference in melting temperature. Therefore, through the overall ingenious design, the firm fixing of the common end is realized, the length of the hard segment is reduced to facilitate the bending adjustment, and the energy transmission tube 12 basically maintains its original shape during the connection process, which ingeniously balances the actual needs in many aspects.

[0090] On the basis of the above embodiment, the probe 11 is an ultrasonic probe, the energy transmission tube 12 is an acoustic transmission hose, and the handle 6 pulls the pull wire 4 in the threading lumen 201 to drive the transmission tube segment 2 to adjust the imaging field of view of the ultrasonic probe. The ultrasonic probe collects image information through rotation and / or retraction, and it is particularly necessary to ensure the consistency of the inner cavity of the energy transmission tube 12 to guarantee the normal work of the ultrasonic probe.

[0091] The probe 11 is an ultrasonic probe 11 with signal generation and recovery functions, and the communication core 5 connected to the probe 11 uses a cable capable of transmitting ultrasonic signals. In cooperation with the acoustic transmission hose used by the energy transmission tube 12 as an acoustic window, the traction and bending adjustment catheter can realize ultrasonic imaging.

[0092] And, the pull wire 4 is located at the connection position between the proximal end of the energy transmission tube 12 and the distal end of the transmission tube segment 2 as the distal end fixed point of the pull wire 4, and the two connections of the pull wire 4 are at the free end of the handle 6 as the proximal end movable point of the pull wire 4. When the imaging field of view of the probe 11 needs to be adjusted, that is, when the bending of the traction bending guide tube needs to be adjusted, the handle 6 is operated to pull the corresponding pull wire 4, and the pull wire 4 drives the bendable tube segment in the transmission tube segment 2 to tilt towards the side of the pulled pull wire 4. At this time, the bendable tube segment in the transmission tube segment 2 is in a structure of shrinkage deformation on the side where the pulled pull wire 4 is located, and the bendable tube segment in the transmission tube segment 2 is in a structure of expansion deformation on the side opposite to the pulled pull wire 4.

[0093] In some embodiments, the transmission tube segment 2 includes a bending tube segment 21 and a non-bending main tube segment 22, the proximal end of the energy transmission tube 12 is connected to the distal end of the bending tube segment 21 through the connection table 3, and the proximal end of the bending tube segment 21 is connected to the distal end of the non-bending main tube segment 22 to form a complete transmission tube segment 2. Further, the transmission tube segment 2 further includes a connection tube segment 23, which is the connection between the proximal end of the bending tube segment 21 and the distal end of the non-bending main tube segment 22. It should be noted that the transmission tube segment 2 can not be of uniform material, and in order to facilitate the bending of the distal end of the guide tube, the transmission tube segment 2 can be provided with the aforementioned segmented structure or a structure with gradually increasing hardness from the distal end to the proximal end, and the material hardness of the part of the transmission tube segment 2 closer to the connection table 3 is lower, that is, this part is connected to the hardened tube segment 31. Therefore, when the handle 6 drives the pull wire 4, the pull wire 4 is connected to the hardened tube segment 31 and drives the guide tube to bend, and the bending more easily occurs in the transmission tube segment 2 near the connection with the hardened tube segment 31, so as to realize the bending of the distal end of the guide tube according to the operation to drive the probe 11 to collect the tissue information in the required direction.

[0094] For example, Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9As shown, in some embodiments, the number of pull wires 4 is two, and the inner part of the transmission pipe section 2 has four wire passing cavities 201, which are parallel to each other and evenly arranged around the center line of the transmission pipe section 2, that is, the central angle of any two adjacent wire passing cavities 201 is 90 degrees. In some embodiments, the four wire passing cavities 201 are arranged in a rectangular shape, that is, they are arranged at the top corners of the rectangular region, respectively. Correspondingly, the two pull wires 4 together have four free ends, which are respectively inserted into the corresponding wire passing cavities 201, so that the central angle of any two adjacent free ends is 90 degrees, and the common end connecting the two free ends of the same pull wire 4 is located outside the left end of the transmission pipe section 2. After the left end of the transmission pipe section 2 is butt welded and connected to the right end of the functional pipe section 1 to form the connection table 3, the common end can be wrapped and fixed inside the connection table 3. In the above embodiment of arranging two groups of pull wires 4, the traction bending guide tube can be bent in four directions with adjacent angles of 90 degrees.

[0095] Of course, the number of pull wires 4 is not limited, and it can also be three or four groups, etc., as long as it meets the bending requirements.

[0096] In some embodiments, the traction bending guide tube further comprises a wire protection sleeve 7 and a connection seat 8. The distal end of the wire protection sleeve 7 is connected to the proximal end of the handle 6, and the wire protection sleeve 7 is sleeved outside the communication core 5 to protect it. The connection seat 8 is connected to the proximal end of the wire protection sleeve 7, and the communication core 5 is signal connected to the connection seat 8. In use, the connection seat 8 is connected to the imaging system, so that the signal transmitted back by the communication core 5 can be transmitted to the imaging system for processing.

[0097] In some embodiments, the handle 6 comprises an outer layer rotating mechanism 61, an inner layer bending control mechanism 62, and a handle main body 63. The outer layer rotating mechanism 61 and the inner layer bending control mechanism 62 are movably arranged in the handle main body 63. The outer layer rotating mechanism 61 is connected to the proximal end of the transmission pipe section 2, and is used to control the rotational movement of the outer layer guide tube including the energy transmission pipe 12 and the transmission pipe section 2. The inner layer bending control mechanism 62 is connected to the pull wire 4, and is used to pull the pull wire 4 to realize the bending control of the guide tube.

[0098] In addition to the above traction bending guide tube, the present application also provides an assembly method applied to the traction bending guide tube disclosed in the above embodiments. The assembly method comprises the following steps:

[0099] Step S1: Assemble the probe 11 inside the energy transmission pipe 12. It can be understood that the probe 11 is first assembled into the inside of the energy transmission pipe 12 to complete the assembly of the functional pipe section 1.

[0100] The first free end of the pull wire 4 is exposed to the proximal end of the transmission pipe segment 2, the second free end of the pull wire 4 is inserted into the first lumen 201a to the distal end of the transmission pipe segment 2, the second free end of the pull wire 4 is inserted into the second lumen 201b and exposed to the proximal end of the transmission pipe segment 2, and the second free end of the pull wire 4 is knotted at the distal end of the transmission pipe segment 2 to form a common end; the assembly of the pull wire 4 and the transmission pipe segment 2 is completed to complete the assembly work required before the transmission pipe segment 2 is assembled with the energy transmission pipe 12, and the two free ends of the pull wire 4 are defined as the first free end and the second free end respectively to facilitate the distinction, and the specific process of the assembly of the pull wire 4 is that the second free end of the pull wire 4 is taken and inserted into one of the lumen 201 of the transmission pipe segment 2 from the proximal opening of the lumen 201 until the second free end of the pull wire 4 extends to the outside of the distal end of the transmission pipe segment 2 and a target length is reserved outside the distal end of the transmission pipe segment 2, then the second free end is knotted at the target length of the pull wire 4 to form a common end, and the second free end is inserted into the other lumen 201 of the transmission pipe segment 2 from the distal opening of the lumen 201 until the second free end of the pull wire 4 extends to the outside of the proximal end of the transmission pipe segment 2, and the position of the pull wire 4 is adjusted slightly so that the anti-coming-off knot 41 is located at the target position of the distal end of the transmission pipe segment 2, such as the center position of the first lumen 201a and the second lumen 201b (the knot can be knotted first and then inserted into the second lumen 201b, or the knot can be knotted first and then inserted into the second lumen 201b from the proximal end of the second lumen 201b). Moreover, each group of pull wires 4 repeats the specific process of the assembly of the pull wire 4 in turn, that is, the assembly of the pull wire 4 and the transmission pipe segment 2 is completed.

[0101] Optionally, before the assembly of the pull wire 4 and the transmission pipe segment 2, the end of the pull wire 4 is connected to the end of the pull wire by bonding or a heat shrink tube; in the above process of assembling the pull wire 4 and the transmission pipe segment 2, the free end of the pull wire is inserted into one of the lumens 201 of the transmission pipe segment 2 from the proximal opening of the lumen 201, and the free end of the pull wire is inserted into the other lumen 201 of the transmission pipe segment 2 from the distal opening of the lumen 201.

[0102] It should be noted that the operation of assembling the probe 11 to the energy transmission pipe 12 in the above step S1 and the operation of assembling the pull wire 4 to the transmission pipe segment 2 can be performed simultaneously, or one of them can be performed first and the other can be performed later.

[0103] Step S2: The common end is fixedly embedded in the connection table 3 between the energy transmission pipe 12 and the transmission pipe segment 2; it can be understood that the distal end of the transmission pipe segment 2 and the proximal end of the energy transmission pipe 12 are connected by the connection table 3, and the common end of the pull wire 4 is embedded in the inside of the connection table 3. For example, the distal end of the transmission pipe segment 2 and the proximal end of the energy transmission pipe 12 are directly connected and fixed by fusion welding, and the connection table 3 is a part of the pipe body structure that is mixed and solidified by the fusion structure of the distal end of the transmission pipe segment 2 and the fusion structure of the proximal end of the energy transmission pipe 12.

[0104] The first free end and the second free end of the pull wire 4 are connected with the handle 6 respectively; it can be understood that both free ends of the pull wire 4 are connected with the handle 6, so that the first free end and the second free end can be pulled respectively by operating the handle 6, thereby realizing the bending adjustment.

[0105] It should be noted that the operation of assembling the energy-transmitting tube 12 with the transmission tube segment 2 in step S2 and the operation of connecting the pull wire 4 with the handle 6 can be performed simultaneously, or one of them can be performed first and the other can be performed later.

[0106] On the basis of the above embodiment, in step S1, the first free end of the pull wire 4 is exposed at the proximal end of the transmission tube segment 2, the second free end of the pull wire 4 is inserted into the first lumen 201a to the distal end of the transmission tube segment 2, the second free end of the pull wire 4 is inserted into the second lumen 201b and exposed at the proximal end of the transmission tube segment 2, and the second free end of the pull wire 4 is knotted at the distal end of the transmission tube segment 2 to form a common end, comprising the following steps:

[0107] Step S11: connecting the stiffening tube segment 31 at the distal end of the transmission tube segment 2; it can be understood that the stiffening tube segment 31 is connected at the distal end of the transmission tube segment 2 by means of bonding or welding, so as to form a complete lumen or path for the pull wire 4 to pass through inside the catheter, and the complete lumen required for the pull wire 4 to pass through inside the catheter is the threading lumen 201 in the transmission tube segment 2 and the passage in the stiffening tube segment 31 which communicates with the threading lumen 201, and a lumen main body for the communication core 5 to pass through inside the catheter is formed, and the lumen main body required for the communication core 5 to pass through inside the catheter is the central lumen 202 in the transmission tube segment 2 and the passage in the stiffening tube segment 31 which communicates with the central lumen 202.

[0108] Step S12: exposing the first free end of the pull wire 4 at the proximal end of the transmission tube segment 2, inserting the second free end of the pull wire 4 into the first lumen 201a to the distal end of the stiffening tube segment 31, inserting the second free end of the pull wire 4 into the second lumen 201b and exposing it at the proximal end of the transmission tube segment 2, and knotting the second free end of the pull wire 4 at the distal end of the stiffening tube segment 31 to form a common end;

[0109] It can be understood that after the complete pull wire 4 is formed to pass through the required lumen inside the catheter in step S11, the assembly work of the pull wire 4 is carried out in this step, specifically, the second free end of the pull wire 4 is taken and inserted into the first lumen 201a of the transmission pipe section 2 from the proximal end opening thereof until the second free end of the pull wire 4 extends out of the distal end of the hardening pipe section 31 outside after passing through the passage corresponding to the first lumen 201a of the hardening pipe section 31, and then the second free end is inserted into the passage corresponding to the target second lumen 201b of the hardening pipe section 31 from the distal end opening of the transmission pipe section 2, until the second free end of the pull wire 4 extends out of the proximal end of the transmission pipe section 2, and is knotted to form a common end at the target length position of the pull wire 4 (the knot can be made first and then inserted into the second lumen 201b, or the knot can be made first and then inserted from the proximal end of the second lumen 201b).

[0110] Correspondingly, before the above step S2, the following step is further included, or the step S1 further includes the following step: connecting the transition pipe section 32 to the proximal end of the functional pipe section 1; it can be understood that in order to prepare the traction bending catheter including the hardening pipe section 31 and the transition pipe section 32, the above steps S11 and S12 have completed the related preparation work of the hardening pipe section 31, and the preparation work of the transition pipe section 32 needs to be completed in this step, that is, the distal end of the transition pipe section 32 is connected to the proximal end of the energy-transmitting pipe 12 by bonding or welding. It should be noted that this step can be performed simultaneously with any one of the above steps S11 and S12, or before or after any one of them.

[0111] In the above step S2, the common end is fixedly embedded in the connection table 3 between the energy-transmitting pipe 12 and the transmission pipe section 2; including the following steps:

[0112] The hardening pipe section 31 and the transition pipe section 32 are fused to form the connection table 3, so that the common end is fixedly embedded in the connection table 3; it can be understood that the distal end of the hardening pipe section 31 and the proximal end of the transition pipe section 32 are fused to form the connection table 3, so that the fixed end of the pull wire 4 passing through the distal end of the hardening pipe section 31 is embedded in the inside of the connection table 3.

[0113] On the basis of the above embodiment, before the common end is fixedly embedded in the connection table 3 between the energy-transmitting pipe 12 and the transmission pipe section 2 in step S2, the following steps are included:

[0114] The common end of the pull wire 4 is pulled to the opposite side of the first lumen 201a and the second lumen 201b, and then the communication core 5 is installed in the central lumen 202, so that the pull wire 4 is arranged in a half-enclosed manner around the communication core 5 at the distal end of the transmission tube segment 2; it can be understood that, in order to prepare a plurality of groups of pull wires 4 arranged in the above-mentioned double-sided crossing manner, after the pull wire 4 is assembled to the transmission tube segment 2 through step S1, the common end of the pull wire 4 is pulled to the opposite side of the first lumen 201a and the second lumen 201b, and then the communication core 5 is installed in the transmission tube segment 2, which can be inserted into the central lumen 202 from the proximal end opening of the central lumen 202 until the communication core 5 penetrates out to the outside of the distal end of the transmission channel, so that the communication core 5 is located in the half-enclosed area of the pull wire 4, that is, the pull wire 4 is arranged in a half-enclosed manner around the communication core 5 at the distal end of the transmission tube segment 2.

[0115] It should be noted that the relationship terms such as "first" and "second" described above are only used to distinguish one entity from another entity, and do not necessarily require or imply any actual relationship or order between the entities; the "upper surface, lower surface, top, bottom" described above and the orientation words "up, down, left, right" are all defined based on the drawings.

[0116] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0117] The traction and bending guide catheter and the assembly method thereof provided by the present application are described in detail above. The principles and implementation modes of the present application are described by applying specific examples in this paper, and the above description of the embodiments is only used to help understand the method and its core idea of the present application. It should be pointed out that, for ordinary skilled in the art, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A pullback shaped catheter, comprising: The utility model relates to a kind of traction bending catheters, comprising: Functional tube section, including probe and energy transmission tube set outside the probe; Transmission tube section is connected in the proximal end of the functional tube section, it is provided with even number of threading cavities, and each threading cavity penetrates along the length direction of the transmission tube section and is separated from each other; Handle is connected in the proximal end of the transmission tube section; Several groups of pull wires, any group of the pull wire has a common end and two free ends, the common end is embedded in the connecting table between the energy transmission tube and the transmission tube section, and the fixed position of the common end on the connecting table is staggered distribution with the threading cavity, and the two free ends of any group of the pull wire are connected with the handle through different threading cavities, and any free end is independently driven by the handle; The common end is arranged around the communication core in the connecting table to be able to present the state of holding around the communication core.

2. The steerable catheter of claim 1, wherein, The transmission tube section is provided with a central cavity for accommodating a communication core connected with the probe, and a plurality of threading cavities are distributed around the central cavity; The connecting table is arranged at an angle with the threading cavities, and any group of the pull wire is bent in the connecting table to extend into the threading cavity.

3. The steerable catheter of claim 2, wherein, The two free ends of the pull wire are respectively threaded into a first cavity and a second cavity; The common end of the pull wire is fixed between the first cavity and the second cavity, and each pull wire is staggered on the connecting table;Or, the common end of the pull wire is fixed on the opposite side of the first cavity and the second cavity, and any pull wire is arranged around the communication core in the connecting table, and each pull wire is cross-distributed on the connecting table.

4. The steerable catheter of claim 2, wherein, The connecting table is provided with a mounting groove for accommodating the pull wire, and the mounting groove is arranged around the central cavity.

5. The steerable catheter of claim 1, wherein, The common end of the pull wire is formed by an anti-disengagement structure, and the maximum width of the threading cavity is less than the width of the anti-disengagement knot.

6. The steerable catheter of claim 2, wherein, The connecting table includes a hardened tube section and a transition tube section, and the hardened tube section and the transition tube section are sequentially arranged between the transmission tube section and the energy transmission tube, the hardened tube section is provided with a passage communicating with the threading cavity and the central cavity, the transition tube section is provided with a cavity communicating with the central cavity, and the common end is embedded between the hardened tube section and the transition tube section.

7. The steerable catheter of claim 6, wherein, The hardness of the hardened tube section is greater than the hardness of the transmission tube section and the hardness of the energy transmission tube, and the hardness of the transition tube section is between the hardness of the hardened tube section and the hardness of the energy transmission tube.

8. The steerable catheter of any of claims 1-7, wherein, The probe is an ultrasonic probe, the energy transmission tube is a sound transmission hose, and the handle pulls the pull wire in the threading cavity to drive the transmission tube section to adjust the imaging field of view of the ultrasonic probe.

9. A method of assembling a pull-wire deflection catheter, comprising: The assembly method is applied to the traction bending catheter comprising any one of the above claims 1-8, and the assembly method comprises: Assembling the probe inside the energy transmission tube; The first free end of the pull wire is exposed to the proximal end of the transmission tube section, the second free end of the pull wire is threaded into the first cavity to the distal end of the transmission tube section, the second free end of the pull wire is threaded into the second cavity and exposed to the proximal end of the transmission tube section, and the second free end of the pull wire is knotted to form a common end at the distal end of the transmission tube section. The public end is arranged to be semi-enclosed around the communication core in the connecting table to be able to present a state of embracing around the communication core; The public end is fixedly embedded in the connecting table between the energy-transmitting pipe and the transmission pipe section; The first free end and the second free end of the pull wire are connected with the handle respectively.

10. The method of assembly of claim 9, wherein, A hardening pipe section is connected at the distal end of the transmission pipe section; A transition pipe section is connected at the proximal end of the functional pipe section; The first free end of the pull wire is externally arranged at the proximal end of the transmission pipe section, the second free end of the pull wire is penetrated into the first cavity to the distal end of the hardening pipe section, the pull wire is knotted to form the public end at the distal end of the hardening pipe section, then the second free end is penetrated into the second cavity and exposed at the proximal end of the transmission pipe section; The hardening pipe section and the transition pipe section are fused to form the connecting table, and the public end is fixedly embedded in the connecting table.

11. The method of assembly of claim 9, wherein, Before the public end is fixedly embedded in the connecting table between the energy-transmitting pipe and the transmission pipe section, comprising: The public end of the pull wire is pulled to the opposite side of the first cavity and the second cavity, and then a communication core is installed in the central cavity, so that the pull wire is arranged to be semi-enclosed around the communication core at the distal end of the transmission pipe section.

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