Traction bending adjusting catheter and assembling method thereof

Abstract

The invention discloses a traction bending adjusting catheter and an assembling method thereof, and relates to the technical field of interventional medical equipment. The traction bending-adjusting catheter comprises a functional tube section, a transmission tube section, a handle and a plurality of groups of stay wires; the functional pipe section comprises a probe and an energy-permeable pipe arranged outside the probe in a sleeving mode. The transmission pipe section is connected to the near end of the functional pipe section and is provided with an even number of threading cavities, and the threading cavities are communicated in the length direction of the transmission pipe section and are separated from one another; the handle is connected to the near end of the transmission pipe section; any group of stay wires is provided with a common end and two free ends, the common end is embedded in the connecting table between the energy permeable pipe and the transmission pipe section, the fixed position of the common end on the connecting table and the threading cavity channels are distributed in a staggered manner, the two free ends of any group of stay wires are connected with the handle through different threading cavity channels, and any free end is independently driven by the handle; and the process simplicity, the assembly lossless property and the bending adjustment durability are greatly improved.

Description

Technical Field

[0001] This application relates to the field of interventional medical device technology, and more specifically, to a traction and bending catheter and its assembly method. Background Technology

[0002] Currently, many interventional diagnostic and therapeutic catheters require directional bending. Specifically, the catheter usually needs to be equipped with a pull cord inside. The proximal end of the pull cord is fixed to the handle, and the distal end of the pull cord is fixed to the bending section at the distal end of the catheter. The individual pull cords are controlled by the handle to achieve directional bending of the catheter.

[0003] Correspondingly, special processes and methods are required to fix the pull wire during the conduit manufacturing process. For example, the pull wire can be fixed by welding or connected to a special fastener located at the distal end of the conduit. However, the welding method has high process requirements and is prone to insufficient connection strength at the distal end of the pull wire, which can lead to pull-out during repeated pulling and bending. The fastener increases the length of the hard section of the pull wire connection and the outer diameter of the conduit. Furthermore, the fastener needs to be encapsulated and fixed inside the conduit through high-temperature welding, which can easily cause deformation or performance damage to the functional components at the distal end of the conduit.

[0004] In summary, improving the ease of manufacturing, non-destructive assembly, and durability of catheters is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a traction bending guide tube that is simple to manufacture, non-destructive to assemble, and has high bending durability.

[0006] Another objective of this application is to provide an assembly method for the above-mentioned traction bending conduit.

[0007] To achieve the above objectives, this application provides the following technical solution:

[0008] A traction and bending guide tube, comprising:

[0009] The functional tube section includes a probe and a power-transmitting tube sleeved outside the probe;

[0010] A transmission pipe segment, connected to the proximal end of the functional pipe segment, is provided with an even number of threading cavities, and each of the threading cavities is connected along the length of the transmission pipe segment and separated from each other.

[0011] A handle is attached to the proximal end of the transmission pipe section;

[0012] Several sets of pull wires, each set of pull wires having a common end and two free ends, the common end being embedded in the connecting platform between the energy-transmitting tube and the transmission tube segment, and the fixed position of the common end on the connecting platform being staggered from the threading cavity, the two free ends of each set of pull wires being connected to the handle through different threading cavities, and each free end being driven independently by the handle.

[0013] In some embodiments, the transmission tube segment is provided with a central cavity, the central cavity being used to accommodate the communication core connected to the probe, and a plurality of the wire-passing cavities are distributed around the central cavity;

[0014] The connecting platform is set at an angle to the threading cavity, and any set of the pull wires is bent at the connecting platform to extend into the threading cavity.

[0015] In some embodiments, the two free ends of the pull wire are respectively inserted into the first cavity and the second cavity;

[0016] The common end of the pull wire is fixed between the first cavity and the second cavity, and the pull wires are staggered on the connecting platform; or, the common end of the pull wire is fixed on the opposite side of the first cavity and the second cavity, any one of the pull wires is arranged to semi-enclose the communication core on the connecting platform, and the pull wires are crisscrossed on the connecting platform.

[0017] In some embodiments, the connecting platform is provided with a mounting groove for receiving the pull wire, the mounting groove being disposed around the central cavity.

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

[0019] In some embodiments, the connecting platform includes a hardened pipe section and a transition pipe section. The hardened pipe section and the transition pipe section are sequentially arranged between the transmission pipe section and the energy-transmitting pipe. The hardened pipe section is provided with a channel communicating with the threading cavity and the central cavity. The transition pipe section is provided with a cavity communicating with the central cavity. The common end is embedded between the hardened pipe section and the transition pipe section.

[0020] In some embodiments, the hardness of the hardened pipe section is greater than the hardness of the transmission pipe section and greater than the hardness of the energy-transmitting pipe, and the hardness of the transition pipe section is between the hardness of the hardened pipe section and the hardness of the energy-transmitting pipe.

[0021] In some embodiments, the probe is an ultrasonic probe, the energy-transmitting tube is a sound-transmitting flexible tube, and the handle pulls the pull wire in the threaded cavity to drive the transmission tube section to adjust the imaging field of the ultrasonic probe.

[0022] A method for assembling a traction bending conduit, applied to a traction bending conduit comprising any one of the above-described embodiments, the assembly method comprising:

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

[0024] The first free end of the pull wire is placed outside the proximal end of the transmission pipe section, the second free end of the pull wire is inserted into the first cavity to the distal end of the transmission pipe section, the second free end of the pull wire is inserted into the second cavity and exposed outside the proximal end of the transmission pipe section, and the pull wire is knotted at the distal end of the transmission pipe section to form a common end.

[0025] The common end is fixedly embedded in the connecting platform between the energy-transmitting tube and the transmission tube segment;

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

[0027] In some embodiments, a hardened pipe section is connected to the distal end of the transmission pipe section;

[0028] A transition pipe section is connected to the proximal end of the functional pipe section;

[0029] The first free end of the pull wire is placed outside the proximal end of the transmission pipe section, and the second free end of the pull wire is inserted into the first cavity to the distal end of the hardened pipe section. The pull wire is knotted at the distal end of the hardened pipe section to form a common end, and then the second free end is inserted into the second cavity and exposed outside the proximal end of the transmission pipe section.

[0030] The hardened pipe section and the transition pipe section are fused together to form the connecting platform, so that the common end is fixedly embedded in the connecting platform.

[0031] In some embodiments, before the common end is fixedly embedded in the connecting platform between the energy-transmitting tube and the transmission tube segment, the following steps are included:

[0032] The common end of the pull wire is pulled to the opposite side of the first cavity and the second cavity, and then the communication core is installed in the central cavity, so that the pull wire is arranged to semi-enclose the communication core at the far end of the transmission tube section.

[0033] In this application, the traction-bending catheter has a functional segment at its distal end along its length. The probe is a device capable of emitting and receiving detection signals to achieve in vivo imaging. Correspondingly, a permeable tube is a flexible tube through which the signals emitted by the probe can pass. The probe is housed inside the permeable tube to protect it, while contacting the patient through the outer surface of the permeable tube. Thus, the traction-bending catheter can be inserted into the patient's body and imaging is achieved through probe detection. A transmission segment is located in the middle of the traction-bending catheter's length, used for inserting the probe cable and pull wire. The proximal end of the traction-bending catheter is a handle, which, together with the pull wire, allows the traction-bending catheter to bend during its journey through complex physiological environments such as the heart.

[0034] The beneficial effect is that the number of wiring cavities opened in the transmission pipe section is even, the wiring cavities run through the length of the transmission pipe section, one end of the wiring cavity is located at the far end face of the transmission pipe section, and the other end is located at the near end face of the transmission pipe section. Correspondingly, a set of pull wires is set in a U-shape and a V-shape on the far end face of the transmission pipe section, and its two parts pass through two independent wiring cavities.

[0035] Since each of the several sets of guy wires is a complete and continuous guy wire, and is folded in half at the far end of the transmission pipe section, and since the common end is directly embedded inside the connecting platform, compared with related technologies, the traction bending conduit in this application has both convenient assembly and the ability to ensure the controllability of the conduit bending in different directions. Furthermore, the method of directly embedding the common end does not require the use of custom fasteners, which is beneficial to shorten the hard section length of the guy wire connection and reduce the outer diameter of the conduit. The process is simple, the assembly is non-destructive, and the bending durability is high, and the stress change is small, resulting in a high bending capacity. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the overall structure of a specific embodiment provided by the present invention;

[0038] Figure 2 This is a partial structural diagram of a specific embodiment provided by the present invention;

[0039] Figure 3 This is a partial structural cross-sectional view of a specific embodiment provided by the present invention;

[0040] Figure 4This is another partial structural cross-sectional view of a specific embodiment provided by the present invention;

[0041] Figure 5 for Figure 4 AA (Chinese AA) Figure 1 ;

[0042] Figure 6 This is a schematic diagram of the non-crossing state of the double-group pull wires in a specific embodiment of the present invention;

[0043] Figure 7 for Figure 4 AA (Chinese AA) Figure 2 ;

[0044] Figure 8 This is a schematic diagram of the double-sided crossing state of the double-group pull wires in a specific embodiment of the present invention;

[0045] Figure 9 This is a schematic diagram from another angle showing the double-sided crossing state of the double-group pull wires in a specific embodiment provided by the present invention;

[0046] Figure 10 for Figure 4 AA (Chinese AA) Figure 3 ;

[0047] Figure 11 for Figure 4 AA (Chinese AA) Figure 4 ;

[0048] Figure 12 for Figure 4 AA (Chinese AA) Figure 5 .

[0049] The reference numerals in the figures include:

[0050] 1-Functional tube section; 11-Probe; 12-Energy-transmitting tube;

[0051] 2-Transmission pipe section; 201-Threading cavity; 201a-First cavity; 201b-Second cavity; 202-Center cavity; 21-Adjustable pipe section; 22-Non-adjustable main pipe section; 23-Connecting pipe section;

[0052] 3-Connecting platform; 31-Reinforced pipe section; 32-Transition pipe section;

[0053] 4-Pull cord; 41-Anti-knot;

[0054] 5-Communication core;

[0055] 6-Handle; 61-Outer rotating mechanism; 62-Inner bending control mechanism; 63-Handle body;

[0056] 7-Wire protection sleeve;

[0057] 8-Connector. Detailed Implementation

[0058] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0059] In the specific embodiments, the distal and proximal ends refer to the portion of the corresponding component that is farther from the surgeon or operator, typically the end where the component enters the patient's body or surgical area. The proximal end refers to the portion of the corresponding component that is closer to the surgeon or operator, typically the end held or manipulated by the surgeon or operator. For a single component, the end closer to the surgeon or operator is the proximal end, and the end farther from the surgeon or operator is the distal end. Furthermore, in this invention, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] The core of this application is to provide a traction bending conduit that is simple to manufacture, non-destructive to assemble, and durable in bending. Another core aspect of this application is to provide an assembly method for the aforementioned traction bending conduit.

[0061] This application provides a traction bending conduit, including a functional tube segment 1, a transmission tube segment 2, a handle 6, and several sets of pull wires 4 (one or more sets of pull wires 4); wherein, the functional tube segment 1 includes a probe 11 and a transmission 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 is connected along the length direction of the transmission tube segment 2 and separated from each other; the handle 6 is connected to the proximal end of the transmission tube segment 2; each set of pull wires 4 has a common end and two free ends, the common end is embedded in the connecting platform 3 between the transmission tube 12 and the transmission tube segment 2, and the fixed position of the common end on the connecting platform 3 is staggered from the threading cavity 201, and the two free ends of any set of pull wires 4 are connected to the handle 6 through different threading cavities 201, and each free end is driven independently by the handle 6.

[0062] refer to Figure 1-3As explained, along its length, the traction and bending catheter has a functional tube segment 1 at its left end. The probe 11 is a device capable of emitting and receiving detection signals to achieve in vivo imaging. Correspondingly, the permeable tube 12 is a flexible tube through which the signal emitted by the probe 11 can pass. It has internal cavities with a circular or rectangular cross-section. The probe 11 is placed within the internal cavity of the permeable tube 12 to protect it, while contacting the patient through the outer surface of the permeable tube 12. Thus, the traction and bending catheter can be inserted into the patient's body and imaging, such as ultrasound or OCT imaging, can be achieved through the probe 11. The middle section of the traction and bending catheter is a transmission tube segment 2, used to insert the probe 11 cable and pull wire 4. The right end of the traction and bending catheter is a handle 6, which, together with the pull wire 4, controls the traction and bending catheter to change direction during its journey through complex physiological environments such as the heart.

[0063] refer to Figure 6 , Figure 8 and Figure 9 As explained, the number of wiring cavities 201 opened in the transmission pipe section 2 is an even number. The wiring cavities 201 run through the transmission pipe section 2 along its length. One end of the wiring cavity 201 is located at the left end face of the transmission pipe section 2, and the other end is located at the right end face of the transmission pipe section 2. Correspondingly, a set of pull wires 4 are arranged in a U-shape and a V-shape on the far end face of the transmission pipe section 2, and its two parts pass through two independent wiring cavities 201.

[0064] In this set of pull wires 4, the common end is located outside the left end of the transmission pipe segment 2 and where the two parts of the wires are connected or closed. The common end of the pull wire 4 is embedded inside the connecting platform 3 between the left end of the transmission pipe segment 2 and the functional pipe segment 1. The connecting platform 3 is a structure for connecting the left end of the transmission pipe segment 2 and the right end of the functional pipe segment 1. The pull wire 4 is fixed by embedding the common end inside the connecting platform 3. Since the two wire passages 201 into which the two parts of the wires 4 are inserted are arranged at intervals, the parts of the two parts of the wires 4 extending from the port of the wire passage 201 at the left end of the transmission pipe segment 2 need to extend close to each other in order to connect or close. Therefore, the fixed position of the common end of the pull wire 4 on the connecting platform 3 is staggered from the wire passage 201.

[0065] It should be noted that the type of connecting platform 3 is not limited, as long as it can accommodate the fixed end of the pull wire 4. For example, the connecting platform 3 can have two pipe sections, with the fixed end of the pull wire 4 located between the two pipe sections, and the two pipe sections are connected by bonding or welding. Alternatively, the connecting platform 3 can be a molten mixture generated during the process of fixing the transmission pipe section 2 and the energy-transmitting pipe 12 by fusion welding, with the molten mixture wrapping around the fixed end of the pull wire 4. With this configuration, there is no need to design and process holes and grooves to fix the common end of the pull wire 4. Alternatively, the connecting platform 3 can be a structure for bonding between the transmission pipe section 2 and the energy-transmitting pipe 12.

[0066] In a set of pull wires 4, the two ends located on the outer right side of the transmission pipe section 2 are called free ends or open ends. The free ends of the pull wires 4 are connected to the handle 6, so that the position of the pull wires 4 can be positioned by manipulating the two free ends of the pull wires 4. When a pull wire 4 is pulled, the conduit bends in the direction of the pull wire 4. Since the common end is embedded inside the connecting platform 3, even if one of the free ends of a set of pull wires 4 and the pull wire 4 on that side are pulled, the pull wire 4 on the other side will not move into the threading cavity 201 where the pull wire 4 on that side is pulled. Therefore, the adjustment of bending at each free end of the pull wires 4 in this application is independent of each other.

[0067] Generally, in the portion of the bending catheter connected distal to the pull suture 4 (i.e., the connecting platform 3 of this application), a shorter rigid segment at this distal connection is more beneficial for the flexibility of the distal catheter, providing better propulsion through tortuous tissues. Simultaneously, a shorter rigid segment allows for more direct and rapid force transmission when the pull suture 4 pulls the bending segment, enabling more accurate control of the bending angle and shape, thus meeting the intraoperative requirements for catheter positioning accuracy. Therefore, the above approach effectively shortens the required rigid segment, resulting in a shorter connecting platform 3, while ensuring a strong connection between the pull suture 4 and the connecting platform 3.

[0068] Since each of the several sets of pull wires 4 is a complete and continuous pull wire 4, and is folded in half at the far end of the transmission pipe section 2, and since the common end is directly embedded inside the connecting platform 3, compared with related technologies, the traction bending conduit in this application has both convenient assembly and the ability to ensure the controllability of the conduit bending in different directions. Furthermore, the method of directly embedding the common end does not require the use of custom fasteners, which is beneficial to shorten the hard section length of the pull wire 4 connection part and reduce the outer diameter of the conduit. The process is simple, the assembly is non-destructive, and the bending durability is high. Moreover, the stress change is small and the bending capability is high.

[0069] It is understood that although the accompanying drawings of this application primarily illustrate specific embodiments with two or more sets of pull wires 4 to explain implementations in more complex situations, this application can also be applied to cases with only one set of pull wires 4, that is, to bending in two directions (such as forward / backward bending or left / right bending), as shown below. Figure 12As shown. Furthermore, this application does not exclude the use of a combination of wire bending and other bending methods to achieve multi-directional bending, such as utilizing... Figure 12 The bidirectional bending method shown is combined with other methods to achieve four-way bending.

[0070] In some embodiments, optionally, the transmission tube segment 2 is provided with a central cavity 202, which is used to accommodate the communication core 5 connected to the probe 11, and multiple wire-threading channels 201 are distributed around the central cavity 202; the connecting platform 3 is set at an angle to the wire-threading channels 201, and any group of pull wires 4 is bent at the connecting platform 3 to extend into the wire-threading channel 201.

[0071] refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As explained, the transmission pipe section 2 has independent central cavities 202 and the aforementioned threading cavities 201. Both the central cavity 202 and the threading cavities 201 extend and penetrate along the length of the transmission pipe section 2, with the central cavity 202 located at the center of the transmission pipe section 2. Several threading cavities 201 are arranged around the central cavity 202. A communication core 5 is inserted into the central cavity 202. The cross-sectional shape of the communication core 5 can be circular or rectangular, etc., to connect to the probe 11 and meet its working requirements. Pull wires 4 are inserted into the several threading cavities 201 to meet the bending requirements of the functional pipe section 1. In this embodiment, the arrangement of the central cavity 202 and the several threading cavities 201 is beneficial to enhancing the bending control accuracy and stability of the traction bending guide.

[0072] Furthermore, as mentioned above, the threading cavity 201 extends along the length of the transmission tube segment 2, while the connecting platform 3 is a disc-shaped structure formed by welding the left end of the transmission tube segment 2 to the right end of the functional tube segment 1. Its expansion direction in all directions has a non-zero angle with the length of the threading cavity 201 and covers the opening of the threading cavity 201 at the left end of the transmission tube segment 2. The structure of any set of pull wires 4 located inside the connecting platform 3 needs to be bent relative to the length of the threading cavity 201, that is, extend along the width of the conduit. Only then can the two segments of a set of pull wires 4 passing through the two threading cavities 201 close together or connect to form a common end. The structure of a set of pull wires 4 located inside the connecting platform 3 extends along the curved or straight segment of the threading cavity 201 into which its two free ends are inserted, while the free end of the pull wire 4 extends along the length of the threading cavity 201 and connects to the handle 6.

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

[0074] In this embodiment, the threading cavity 201 between a common end of a set of pull wires 4 and a free end is defined as the first cavity 201a, and the threading cavity 201 between a common end and another free end is defined as the second cavity 201b. Then, the transmission pipe section 2 is provided with at least one set of the above-mentioned first cavity 201a and second cavity 201b.

[0075] Optional, see reference Figure 5 and Figure 6 As explained, the pull wires 4 can be arranged in a non-crossing manner. Specifically, the first cavity 201a and the second cavity 201b used to insert a set of pull wires 4 are located on the same side of the central cavity 202. Correspondingly, the common end of the same set of pull wires 4 is located in the area between the first cavity 201a and the second cavity 201b into which they are inserted. In particular, the common end of a set of pull wires 4 and the first cavity 201a and the second cavity 201b into which they are inserted are both located on the same side of the central cavity 202. Furthermore, the transmission pipe section 2 has a number of threading cavities 201 arranged sequentially around the central cavity 202. The first cavity 201a and the second cavity 201b into which a set of pull wires 4 are inserted are two adjacent ones among the number of threading cavities 201 arranged around the central cavity 202, thereby making the pull wires 4 staggered on the connecting platform 3.

[0076] Optional, see reference Figure 7 , Figure 8 and Figure 9As explained, the pull wires 4 can be arranged in a double-sided crisscross manner. Specifically, the first cavity 201a and the second cavity 201b used to insert a set of pull wires 4 are located on the same side of the central cavity 202. However, the structure of the set of pull wires 4 inside the connecting platform 3 is arranged in a semi-enclosed manner around the communication core 5. That is, the part of the pull wire 4 that passes through the first cavity 201a and the part of the pull wire that passes through the second cavity 201b, after extending from the port at the far end of the transmission tube section 2, need to extend along the width direction of the conduit towards the other side of the central cavity 202 so as to connect on the opposite side of the first cavity 201a and the second cavity 201b where the pull wire 4 is inserted. Then the common end of the set of pull wires 4 is fixed on the opposite side of the first cavity 201a and the second cavity 201b where it is inserted. Due to several The pull wires 4 are all located inside the connecting platform 3 in a semi-enclosed manner around the communication core 5 (the pull wires 4 are in a bent state in the connecting platform 3 and the central angle of the arc segment is not less than 180 degrees). The first cavity 201a and the second cavity 201b of the same pull wire 4 are arranged either adjacently or with at least one wire passage 201 between them. The structure of each pull wire 4 inside the connecting platform 3 is distributed in a double-sided cross manner. Since the pull wires 4 bypass the communication core 5, the force transmitted by the pull wires 4 can be decomposed into two directions, horizontal and vertical, which effectively reduces the force value of the pull wires 4 in a single direction. This allows the pull wires 4 to withstand greater tension without being pulled out, and also improves the fixing strength of the common end of the pull wires 4.

[0077] It should be noted that, Figure 9 To facilitate understanding of the winding method of the double-sided cross arrangement of the guy wires 4, the two sets of guy wires 4 are presented with the outer diameter of one set of guy wires 4 being larger than that of the other set of guy wires 4. It should be noted that this application does not limit the outer diameter of several sets of guy wires 4. Several sets of guy wires 4 may have the same outer diameter, or several sets of guy wires 4 may have different outer diameters, or even some sets of guy wires 4 may have the same outer diameter and the remaining sets of guy wires 4 may have different outer diameters. The differences in the physical characteristics of each guy wire 4 should not be construed as falling outside the scope of protection of this application.

[0078] In some embodiments, it is further configured that, regardless of whether the structure of the pull wire 4 inside the connecting platform 3 adopts a double-sided crossing method or a non-crossing method, the common end of the pull wire 4 is located on the axis of symmetry of the first cavity 201a and the second cavity 201b, where the two free ends of a set of pull wires 4 are inserted, at the left end (i.e., the far end) port of the transmission pipe section 2. Specifically, a set of pull wires 4 extends from the first cavity 201a and is laid on the connecting platform 3. The section extending from the first cavity 201a to the common end is segment a, and the section extending from the second cavity 201b to the common end is segment b. Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the lengths of segment a and segment b are equal in the initial state (before bending begins), and segment a and segment b are symmetrical about the line connecting the common end and the axis in the initial state, thus ensuring that the structures in the connecting platform have good symmetry and stability.

[0079] It should be noted that the arrangement of the several sets of pull wires 4 is not limited to the above-mentioned optional methods, as long as it can meet the requirements for fixing and adjusting the pull wires 4. For example, in some embodiments, a threading cavity 201 is spaced between the first cavity 201a and the second cavity 201b through which a set of pull wires 4 pass. Optionally, such as Figure 10 As shown, at least two sets of adjacent pull wires 4 are distributed close to each other on the same side of the central cavity 202, and in this case, the structure of each pull wire 4 inside the connecting platform 3 adopts a single-sided cross distribution; or, optionally, as Figure 11 As shown, the structure of each guy wire 4 inside the connecting platform 3 adopts a double-sided cross distribution. The double-sided cross distribution refers to the line segments of one group of guy wires 4 located on both sides of the common end crossing with at least another group of guy wires 4 located on both sides of the common end.

[0080] In some embodiments, the connecting platform 3 is provided with a mounting groove for accommodating the pull wire 4, the mounting groove being disposed around the central cavity 202.

[0081] refer to Figure 3 , Figure 4 , Figure 5 and Figure 7 To accommodate the pull wire 4 and fix its common end, the connecting platform 3 has an installation slot inside to better ensure the accuracy of the fixed position of the common end. The port of the wire passage 201 at the far end of the transmission pipe section 2 is opened in the installation slot. Thus, the common end of the pull wire 4 and the part of the wire from the common end to the port of the wire passage 201 at the far end of the transmission pipe section 2 can be presented as if passing through the installation slot of the connecting platform 3. Since several wire passages 201 are arranged around the central cavity 202, the connecting wire of the pull wire 4 with a common end between the two wire passages 201 it passes through is set around the central cavity 202. Therefore, the installation slot used to accommodate the connecting wire of the pull wire 4 is also set around the central cavity 202.

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

[0083] refer to Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9As explained, the common end of the pull wire 4 is the anti-detachment knot 41 shown in the figure. The anti-detachment knot 41 can be a single knot, a double single knot, or a single figure-eight knot, or it can be achieved by adhesive or attachment. The anti-detachment knot 41 ensures that the maximum width of the common end of the pull wire 4 is greater than the maximum width of the threading cavity 201, thereby preventing the common end of the pull wire 4 from sliding and being dragged into the threading cavity 201 during bending. Furthermore, the maximum width of the anti-detachment knot 41 is at least less than the outer diameter of the tube wall at its location, so as to prevent the anti-detachment knot 41 from being exposed outside the conduit.

[0084] In some embodiments, the connecting platform 3 includes a hardened pipe section 31 and a transition pipe section 32. The hardened pipe section 31 and the transition pipe section 32 are sequentially arranged between the transmission pipe section 2 and the energy-transmitting pipe 12. The hardened pipe section 31 is provided with a channel communicating with the wire-passing cavity 201 and the central cavity 202. The transition pipe section 32 is provided with a cavity communicating with the central cavity 202. The common end is embedded between the hardened pipe section 31 and the transition pipe section 32.

[0085] refer to Figure 3 As explained, the connecting platform 3, used to connect the transmission pipe section 2 and the functional pipe section 1, consists of two pipe sections. The part adjacent to and connected to the transmission pipe section 2 is the hardened pipe section 31, and the part adjacent to and connected to the functional pipe section 1 is the transition pipe section 32. Optionally, the length of the transition pipe section 32 ranges from 1 to 5 mm, and the end of the transition pipe section 32 is connected to the end of the hardened pipe section 31 that is close to it. Furthermore, the hardened pipe section 31 has several channels arranged in the same way as the central cavity 202 and the threading cavity 201 of the transmission pipe section 2. Among the several channels of the hardened pipe section 31, the channel located at the center position communicates with the central cavity 202 of the transmission pipe section 2. This allows the communication core 5 to pass through, while the remaining channels are arranged around the center position and connected to the corresponding wiring cavity 201 of the transmission pipe section 2, allowing the pull wire 4 to pass through. The transition pipe section 32 only has a channel at the center position, so that it can connect to the central cavity 202 of the transmission pipe section 2 through the channel at the center position of the hardened pipe section 31, allowing the communication core 5 to pass through, but not the pull wire 4. The pull wire 4 is bent relative to the length direction of the wiring cavity 201 at the position between the hardened pipe section 31 and the transition pipe section 32, and the common end is embedded between the hardened pipe section 31 and the transition pipe section 32.

[0086] Based on the above embodiments, the hardened pipe section 31 has a harder hardness than the transmission pipe section 2 and a harder hardness than the energy-transmitting pipe 12. The hardness of the transition pipe section 32 is between the hardened pipe section 31 and the energy-transmitting pipe 12. That is, in this embodiment, as shown... Figure 3 In the structure shown, the hardness of the energy-transmitting pipe 12, the transition pipe section 32 and the hardened pipe section 31 arranged and connected from right to left increases sequentially, and the hardness of the hardened pipe section 31 is also greater than that of the transmission pipe section 2.

[0087] In some embodiments, the transition pipe section 32 is a pipe section structure that has been connected to the near end of the energy-transmitting pipe 12 before the connecting platform 3 is welded to the energy-transmitting pipe 12. It is particularly suitable for a scheme in which several sets of pull wires 4 are located inside the connecting platform 3 and are arranged in a double-sided cross manner. Even in extreme cases, if the pull wires 4 are pulled off or slipped during bending, each set of pull wires 4 is arranged around the communication core 5. Since the communication core 5 can share part of the tension on the pull wires 4, the pull wires 4 will not break, and thus the bending control will not fail. In other words, this application simplifies the fixation of the far end of the pull wire 4 by embedding the common end of each pull wire 4 into the connecting platform 3. Combined with the fact that the common end is semi-enclosed around the communication core 5 at the far end of the conduit (U-shaped, V-shaped, etc.), it helps that when the embedded structure (i.e., the connecting platform 3) at the far end of the pull wire 4 is damaged and the position of the common end cannot be maintained, each pull wire 4 can still be tightly wrapped around the communication core 5 at the far end of the conduit, making the pull wire 4 less likely to be broken and still able to achieve the bending adjustment function, thus providing dual protection for the bending resistance and safety.

[0088] In other embodiments, the transition section 32 is a molten structure formed by the hardened section 31 of the connecting platform 3 during the welding process with the energy-transmitting tube 12. The transition section 32 is a hybrid structure formed by the cooling of a portion of the molten material of the energy-transmitting tube 12 and a portion of the molten material of the hardened section 31. In order to ensure good energy transmission effect, the energy-transmitting tube 12 needs to adopt a structure with low hardness. However, in order to ensure that the pull wire 4 does not pull off or slip during bending, the hardened section 31 needs to have high hardness. Therefore, the hardness of the transition section 32 formed by the partial melting of the energy-transmitting section and the hardened section 31 is between that of the energy-transmitting section and the hardened section 31.

[0089] The above-mentioned connection platform 3 setting promotes a gradual change in hardness from the connection platform 3 to the energy-transmitting tube 12, which is beneficial to ensuring the conformability of the distal end of the conduit, especially avoiding bending at undesirable locations (such as the connection between the connection platform 3 and the energy-transmitting tube 12) during the bending process caused by sudden changes in hardness, ensuring that the distal end of the conduit remains intact as expected and has good bending control performance. When the energy-transmitting tube 12 is made of a softer material and there are higher requirements for the regularity of the shape of the energy-transmitting tube 12, it is preferable that the connection platform 3 includes a transition tube section 32 with different hardness and a hardened tube section 31. This shortens the length of the hardened section of the connection platform 3, which is beneficial to ensuring the pushing performance and the accuracy of bending. On the other hand, directly fusion-connecting the hardened tube section 31 and the energy-transmitting tube 12, due to the different hardness, results in a large difference in melting temperature. Direct fusion requires raising the temperature above the melting temperature of the hardened tube section 31. As a result, the melting degree of the energy-transmitting tube 12 is intensified, making it difficult to maintain its own regularity of shape. The design of section 32 avoids the problem of direct fusion connection between the hardened tube section 31 and the energy-transmitting tube 12. Welding the transition tube section 32 and the energy-transmitting tube 12 first reduces the impact on the shape of the energy-transmitting tube 12 because the difference in hardness and melting temperature between the two is smaller. Welding the transition tube section 32 and the hardened tube section 31 then makes it easier to embed and fix the common end in them because the difference in melting temperature is smaller. Thus, through the overall ingenious design, the common end is firmly fixed, the length of the hardened section is reduced to facilitate the adjustment of bending, and the energy-transmitting tube 12 basically maintains its original shape during the connection process, cleverly balancing multiple practical needs.

[0090] Based on the above embodiment, probe 11 is an ultrasonic probe, and the energy-transmitting tube 12 is a sound-transmitting flexible tube. The handle 6 pulls the pull wire 4 inside the wire-passing cavity 201 to drive the transmission tube section 2 to adjust the imaging field of the ultrasonic probe. When the ultrasonic probe acquires image information by rotating and / or retracting, it is especially necessary to ensure the consistency of the inner cavity of the energy-transmitting tube 12 to ensure the normal operation 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 is a cable capable of transmitting ultrasonic signals. Correspondingly, the sound-transmitting tube 12 is a sound-transmitting flexible tube as a sound-transmitting window, so the traction and bending tube can realize ultrasonic imaging.

[0092] Furthermore, the connection point between the proximal end of the energy-transmitting tube 12 and the distal end of the transmission tube segment 2 serves as the distal fixed point of the pull wire 4, while the two connections of the pull wire 4 to the free end of the handle 6 serve as the proximal movable points of the pull wire 4. When it is necessary to adjust the imaging field of the probe 11, that is, when it is necessary to bend the traction bending guide tube, the handle 6 is operated to pull the corresponding pull wire 4. The pull wire 4 causes the bendable tube segment in the transmission tube segment 2 to tilt toward the side of the pulled pull wire 4. At this time, the structure of the bendable tube segment in the transmission tube segment 2 on the side where the pulled pull wire 4 is located undergoes contraction deformation, while the structure of the bendable tube segment in the transmission tube segment 2 on the opposite side of the pulled pull wire 4 undergoes expansion deformation.

[0093] In some embodiments, the transmission pipe segment 2 includes a bendable pipe segment 21 and a non-bendable main pipe segment 22. The proximal end of the energy-transmitting pipe 12 is connected to the distal end of the bendable pipe segment 21 via a connecting platform 3, and the proximal end of the bendable pipe segment 21 is connected to the distal end of the non-bendable main pipe segment 22 to form a complete transmission pipe segment 2. Further, the transmission pipe segment 2 also includes a connecting pipe segment 23, which is the connection point between the proximal end of the bendable pipe segment 21 and the distal end of the non-bendable main pipe segment 22. It should be noted that the transmission tube segment 2 may not be made of a uniform material. To facilitate bending of the distal end of the catheter, the transmission tube segment 2 may be segmented as mentioned above or have a structure where the hardness gradually increases from the distal end to the proximal end. The part of the transmission tube segment 2 closer to the connecting platform 3 has a lower material hardness. That is, this segment is connected to the hardened tube segment 31. Thus, when the handle 6 drives the pull wire 4, the pull wire 4 is connected to the hardened tube segment 31 and causes the catheter to bend. This bending is more likely to occur in the transmission tube segment 2 near the connection with the hardened tube segment 31, thereby enabling the distal end of the catheter to bend according to the control to drive the probe 11 to collect tissue information in the required direction.

[0094] For example, such as Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9As shown, in some embodiments, there are two pull wires 4. Correspondingly, the transmission pipe section 2 has four wire-passing cavities 201 inside. The four parallel wire-passing cavities 201 are evenly arranged around the center line of the transmission pipe section 2, that is, the central angle between any two adjacent wire-passing cavities 201 is 90 degrees. In some embodiments, the four wire-passing cavities 201 are arranged in a rectangle, that is, they are respectively arranged at the apex of the rectangular area. Correspondingly, the two pull wires 4 have a total of four free ends. The ends are respectively inserted into the corresponding threading cavity 201, so that the central angle between any two adjacent free ends is 90 degrees. The common end of the two free ends connected to 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 welded to the right end of the functional pipe section 1 to form the connecting platform 3, the common end can be wrapped and fixed inside the connecting platform 3. In the above embodiment with two sets of pull wires 4, the traction bending guide can be bent in four adjacent directions with an included angle of 90 degrees.

[0095] Of course, there is no limit to the number of pull lines 4; there can be three or four sets, as long as the bending requirements are met.

[0096] In some embodiments, the traction bending guide tube further includes a sheath 7 and a connector 8. The distal end of the sheath 7 is connected to the proximal end of the handle 6, and the sheath 7 is fitted over the outside of the communication core 5 to protect it. The connector 8 is connected to the proximal end of the sheath 7, and the communication core 5 is connected to the connector 8. In use, the connector 8 is connected to the imaging system, which enables the signal transmitted back from the communication core 5 to be transmitted to the imaging system for processing.

[0097] In some embodiments, the handle 6 includes an outer rotating mechanism 61, an inner bending control mechanism 62, and a handle body 63. Both the outer rotating mechanism 61 and the inner bending control mechanism 62 are movably disposed on the handle body 63. The outer rotating mechanism 61 is connected to the proximal end of the transmission tube segment 2 and is used to control the rotational movement of the outer conduit, which includes the energy-permeable tube 12 and the transmission tube segment 2. The inner bending control mechanism 62 is connected to the pull wire 4 and is used to pull the pull wire 4 to achieve bending control of the conduit.

[0098] In addition to the aforementioned traction and bending conduit, this application also provides an assembly method for the traction and bending conduit disclosed in the above embodiments, the assembly method comprising the following steps:

[0099] Step S1: Assemble the probe 11 inside the energy-transmitting tube 12; it can be understood that the probe 11 is first assembled inside the energy-transmitting tube 12 to complete the assembly of the functional tube segment 1.

[0100] The first free end of the pull wire 4 is placed outside the proximal end of the transmission pipe section 2. The second free end of the pull wire 4 is inserted into the first cavity 201a to the distal end of the transmission pipe section 2. The second free end of the pull wire 4 is inserted into the second cavity 201b and exposed outside the proximal end of the transmission pipe section 2. The pull wire 4 is knotted at the distal end of the transmission pipe section 2 to form a common end. This is used to complete the assembly of the pull wire 4 and the transmission pipe section 2, so as to complete the assembly work required for the transmission pipe section 2 before assembly with the energy-transmitting tube 12. The two free ends of a set of pull wires 4 are defined as the first free end and the second free end, respectively, for easy distinction. The specific process of assembling a set of pull wires 4 is as follows: take the second free end of the pull wire 4 and insert it from the proximal end of one of the threading cavities 201 of the transmission pipe section 2. The pull wire 4 is inserted into the open end until the second free end extends to the outer side of the distal end of the transmission pipe section 2, leaving a target length on the outer side of the distal end of the transmission pipe section 2. Then, a knot is tied at the target length position of the pull wire 4 to form a common end. The second free end is then inserted into the open end of the other threading cavity 201 of the transmission pipe section 2 until the second free end of the pull wire 4 extends to the outer side of the proximal end of the transmission pipe section 2. The position of the pull wire 4 is then finely adjusted so that the anti-loosening knot 41 is located at the target position at the distal end of the transmission pipe section 2, such as the center position between the first cavity 201a and the second cavity 201b (the knot can be tied first and then inserted into the second cavity 201b, or it can be inserted from the proximal end of the second cavity 201b first and then tied). Furthermore, each group of pull wires 4 repeats the above specific assembly process for one group of pull wires 4 in sequence, that is, the assembly of the pull wire 4 and the transmission pipe section 2 is realized.

[0101] Optionally, before assembling the pull wire 4 and the transmission tube segment 2, the end of the traction wire is connected to the second free end of the pull wire 4 by means of adhesive bonding or heat shrink tubing; during the assembly process of the pull wire 4 and the transmission tube segment 2, the free end of the traction wire is inserted into the transmission tube segment 2 through the proximal opening of one of the threading channels 201, and the free end of the traction wire is inserted into the transmission tube segment 2 through the distal opening of the other threading channel 201.

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

[0103] Step S2: The common end is fixedly embedded in the connecting platform 3 between the energy-transmitting tube 12 and the transmission tube segment 2. It can be understood that the connecting platform 3 connects the distal end of the transmission tube segment 2 and the proximal end of the energy-transmitting tube 12, with the common end of the pull wire 4 embedded inside the connecting platform 3. For example, the distal end of the transmission tube segment 2 and the proximal end of the energy-transmitting tube 12 are directly connected and fixed using fusion welding. The connecting platform 3 is the part of the tube structure where the fused structure of the distal end of the transmission tube segment 2 and the fused structure of the proximal end of the energy-transmitting tube 12 are mixed and solidified.

[0104] Connect the first and second free ends of the pull cable 4 to the handle 6 respectively. It can be understood that by connecting both free ends of the pull cable 4 to the handle 6, the first and second free ends can be pulled respectively by operating the handle 6, thereby achieving bending.

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

[0106] Based on the above embodiment, in step S1, the first free end of the pull wire 4 is placed outside the proximal end of the transmission pipe section 2, the second free end of the pull wire 4 is inserted into the first cavity 201a to the distal end of the transmission pipe section 2, the second free end of the pull wire 4 is inserted into the second cavity 201b and exposed outside the proximal end of the transmission pipe section 2, and the pull wire 4 is knotted at the distal end of the transmission pipe section 2 to form a common end, including the following steps:

[0107] Step S11: Connect the hardened tube section 31 at the distal end of the transmission tube section 2; it can be understood that the hardened tube section 31 is connected at the distal end of the transmission tube section 2 by bonding or welding to form a complete cavity or path for the pull wire 4 to pass through the conduit. The complete cavity required for the pull wire 4 to pass through the conduit is the threading cavity 201 in the transmission tube section 2 and the channel in the hardened tube section 31 that communicates with the threading cavity 201, and forms the main body of the cavity for the communication core 5 to pass through the conduit. The main body of the cavity required for the communication core 5 to pass through the conduit is the central cavity 202 in the transmission tube section 2 and the channel in the hardened tube section 31 that communicates with the central cavity 202.

[0108] Step S12: Place the first free end of the pull wire 4 outside the proximal end of the transmission pipe section 2, insert the second free end of the pull wire 4 into the first cavity 201a to the distal end of the hardened pipe section 31, insert the second free end of the pull wire 4 into the second cavity 201b and expose it outside the proximal end of the transmission pipe section 2, and tie the pull wire 4 at the distal end of the hardened pipe section 31 to form a common end;

[0109] Understandably, after forming the complete drawstring 4 through step S11 and inserting it into the required cavity inside the catheter, this step involves assembling the drawstring 4. Specifically, the second free end of the drawstring 4 is taken and inserted into the proximal opening of the first cavity 201a of the transfer tube segment 2 until the second free end of the drawstring 4 extends to the distal outer side of the hardened tube segment 31 after passing through the channel corresponding to the first cavity 201a. Then, the second free end is inserted into the distal opening of the channel corresponding to the target second cavity 201b in the transfer tube segment 2 until the second free end of the drawstring 4 extends to the proximal outer side of the transfer tube segment 2. A knot is then tied at the target length position of the drawstring 4 to form a common end (the knot can be tied first and then inserted into the second cavity 201b, or it can be passed out from the proximal end of the second cavity 201b first and then tied).

[0110] Correspondingly, before step S2, the following steps are also included, or step S1 may include the following steps: connecting the transition section 32 to the proximal end of the functional section 1; it can be understood that, in order to prepare the traction bending guide tube including the hardened section 31 and the transition section 32 of the connecting platform 3, the relevant preparatory work for the hardened section 31 has been completed in steps S11 and S12. In this step, the preparatory work for the transition section 32 needs to be completed, that is, the distal end of the transition section 32 is connected to the proximal end of the energy-transmitting tube 12 by bonding or welding. It should be noted that this step can be performed simultaneously with either step S11 or step S12, or before or after either of them.

[0111] In step S2 above, the common end is fixedly embedded in the connecting platform 3 between the energy-transmitting tube 12 and the transmission tube segment 2; this includes the following steps:

[0112] The molten hardened pipe section 31 and the transition pipe section 32 form a connecting platform 3, so that the common end is fixedly embedded in the connecting platform 3. It can be understood that the far end of the molten hardened pipe section 31 and the near end of the transition pipe section 32 form a connecting platform 3, and the fixed end of the pull wire 4, which is passed through to the outside of the far end of the hardened pipe section 31 through the above step S12, is embedded inside the connecting platform 3.

[0113] Based on the above embodiments, before fixing the common end in the connecting platform 3 between the energy-transmitting tube 12 and the transmission tube segment 2 in step S2, the following steps are included:

[0114] Pull the common end of the pull wire 4 to the opposite side of the first cavity 201a and the second cavity 201b, and then install the communication core 5 in the central cavity 202, so that the pull wire 4 is semi-enclosed around the communication core 5 at the far end of the transmission pipe section 2. It can be understood that in order to prepare several sets of pull wires 4 arranged in the above-mentioned double-sided cross manner for traction bending conduits, in this step, after assembling the pull wire 4 to the transmission pipe section 2 through step S1, pull the common end of the pull wire 4 to the opposite side of the first cavity 201a and the second cavity 201b, and then install the communication core 5 into the transmission pipe section 2. This can be done by inserting the communication core 5 into the central cavity 202 from the proximal opening until the communication core 5 extends to the far end of the transmission channel, so that the communication core 5 is located in the semi-enclosed area of ​​the pull wire 4, that is, the pull wire 4 is semi-enclosed around the communication core 5 at the far end of the transmission pipe section 2.

[0115] It should be noted that the relational terms such as "first" and "second" mentioned above are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities; the terms "upper surface," "lower surface," "top," and "bottom" and the directional terms "upper," "lower," "left," and "right" mentioned above are defined based on the accompanying drawings in the specification.

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

[0117] The foregoing has provided a detailed description of the traction bending guide tube and its assembly method provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A traction bending guide tube, characterized in that, include: The functional tube section includes a probe and a power-transmitting tube sleeved outside the probe; A transmission pipe segment, connected to the proximal end of the functional pipe segment, is provided with an even number of threading cavities, and each of the threading cavities is connected along the length of the transmission pipe segment and separated from each other. A handle is attached to the proximal end of the transmission pipe section; Several sets of pull wires, each set of pull wires having a common end and two free ends, the common end being embedded in the connecting platform between the energy-transmitting tube and the transmission tube segment, and the fixed position of the common end on the connecting platform being staggered from the threading cavity, the two free ends of each set of pull wires being connected to the handle through different threading cavities, and each free end being driven independently by the handle.

2. The traction bending guide tube according to claim 1, characterized in that, The transmission tube section is provided with a central cavity, which is used to house the communication core connected to the probe, and a plurality of the wire-passing cavities are distributed around the central cavity; The connecting platform is set at an angle to the threading cavity, and any set of the pull wires is bent at the connecting platform to extend into the threading cavity.

3. The traction bending guide tube according to claim 2, characterized in that, The two free ends of the pull wire are respectively inserted into the first cavity and the second cavity; The common end of the pull wire is fixed between the first cavity and the second cavity, and the pull wires are staggered on the connecting platform; or, the common end of the pull wire is fixed on the opposite side of the first cavity and the second cavity, any one of the pull wires is arranged to semi-enclose the communication core on the connecting platform, and the pull wires are crisscrossed on the connecting platform.

4. The traction bending guide tube according to claim 2, characterized in that, The connecting platform is provided with a mounting groove for accommodating the pull wire, and the mounting groove is arranged around the central cavity.

5. The traction bending guide tube according to claim 1, characterized in that, The common end of the pull wire is made of an anti-detachment structure, and the maximum width of the threading cavity is less than the width of the anti-detachment knot.

6. The traction bending guide tube according to claim 2, characterized in that, The connecting platform includes a hardened pipe section and a transition pipe section. The hardened pipe section and the transition pipe section are sequentially arranged between the transmission pipe section and the energy-transmitting pipe. The hardened pipe section is provided with a channel communicating with the wire-passing cavity and the central cavity. The transition pipe section is provided with a cavity communicating with the central cavity. The common end is embedded between the hardened pipe section and the transition pipe section.

7. The traction bending guide tube according to claim 6, characterized in that, The hardness of the hardened pipe section is greater than that of the transmission pipe section and greater than that of the energy-permeable pipe, while the hardness of the transition pipe section is between that of the hardened pipe section and that of the energy-permeable pipe.

8. The traction bending guide tube according to any one of claims 1-7, characterized in that, The probe is an ultrasonic probe, the energy-transmitting tube is a sound-transmitting flexible tube, and the handle pulls the pull wire in the threaded cavity to drive the transmission tube section to move the ultrasonic probe to adjust the imaging field of view.

9. A method for assembling a traction bending guide tube, characterized in that, The assembly method, applied to the traction bending conduit according to any one of claims 1-8, comprises: Assemble the probe inside the energy-transmitting tube; The first free end of the pull wire is placed outside the proximal end of the transmission pipe section, the second free end of the pull wire is inserted into the first cavity to the distal end of the transmission pipe section, the second free end of the pull wire is inserted into the second cavity and exposed outside the proximal end of the transmission pipe section, and the pull wire is knotted at the distal end of the transmission pipe section to form a common end. The common end is fixedly embedded in the connecting platform between the energy-transmitting tube and the transmission tube segment; Connect the first and second free ends of the pull wire to the handle, respectively.

10. The assembly method according to claim 9, characterized in that, A hardened pipe section is connected to the far end of the transmission pipe section; A transition pipe section is connected to the proximal end of the functional pipe section; The first free end of the pull wire is placed outside the proximal end of the transmission pipe section, and the second free end of the pull wire is inserted into the first cavity to the distal end of the hardened pipe section. The pull wire is knotted at the distal end of the hardened pipe section to form a common end, and then the second free end is inserted into the second cavity and exposed outside the proximal end of the transmission pipe section. The hardened pipe section and the transition pipe section are fused together to form the connecting platform, so that the common end is fixedly embedded in the connecting platform.

11. The assembly method according to claim 9, characterized in that, Before the common end is fixedly embedded in the connecting platform between the energy-transmitting tube and the transmission tube segment, the following steps are included: The common end of the pull wire is pulled to the opposite side of the first cavity and the second cavity, and then the communication core is installed in the central cavity, so that the pull wire is arranged to semi-enclose the communication core at the far end of the transmission tube section.

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