Intracardiac ultrasound catheter and control handle

Abstract

The utility model discloses an intracardiac ultrasound catheter and a control handle. The control handle comprises a fixing mechanism, a rotating mechanism and a self-locking mechanism. The rotating mechanism is movably connected to the fixing mechanism, can rotate around the self axis longitudinally arranged along the control handle, and comprises a front stay wire fixing piece and a rear stay wire fixing piece which are respectively used for fixing one pair of stay wires and driving the corresponding stay wires to longitudinally move along the control handle through rotation; the deformation of the front end of the catheter body is controlled by controlling the tensioning and loosening of the corresponding stay wire, so that bending shapes with different angles are generated; the self-locking mechanism comprises a wave-shaped gasket and two movable gaskets, and the wave-shaped gasket and the two movable gaskets are movably connected to the fixing mechanism and can rotate around the self axis longitudinally arranged along the control handle; the waveform gasket is located between the two movable gaskets and axially connected with the front stay wire fixing piece and the rear stay wire fixing piece in series so as to achieve self-locking of the control handle. The self-locking device is simple in structure, convenient to operate and good in self-locking effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an intracardiac ultrasound catheter and a control handle. BACKGROUND

[0002] Diagnosis and operation of intracardiac diseases are difficult to be directly observed by optical observation, and ultrasound waves can propagate in opaque medium, so the intracardiac ultrasound catheter has wide application in the medical field.

[0003] In order to directly observe anatomical structures such as fossa ovalis, left atrial appendage, left and right atria and ventricles in the heart cavity, guide and position interventional instruments such as occluder, ablation catheter and ventricular assist device, and measure physiological characteristics such as blood flow, thrombus and pericardial effusion, and then monitor safety during operation and evaluate postoperative effect of operations such as atrial fibrillation ablation, patent foramen ovale occlusion, left atrial appendage occlusion, valve repair or replacement, the front end of the catheter needs to realize bending of different angles (commonly known as "bending adjustment"), and the spatial position and imaging angle of the ultrasound probe need to be flexibly adjusted. However, the current realization mode of the bending adjustment function is relatively complex in structure and inconvenient to operate, which affects the success rate of operation and treatment effect. CONTENT OF THE UTILITY MODEL

[0004] To solve the above technical problems, the purpose of the present utility model is to provide an intracardiac ultrasound catheter and a control handle which are simple in structure and convenient to operate.

[0005] The technical solutions provided by the present utility model are as follows:

[0006] A control handle of an intracardiac ultrasound catheter is used for being connected to the rear end of a catheter body of the intracardiac ultrasound catheter, and controlling deformation of the front end of the catheter body. Four pull wire cavities separated by 90° are arranged in the catheter body, and each pull wire cavity is arranged with a pull wire which can freely move in the pull wire cavity. One end of each pull wire is fixed to the front end of the catheter body, and pull wires separated by 180° form a pair, and two pairs are formed. The control handle fixes the other end of each pull wire, and includes a fixing mechanism, a rotating mechanism and a self-locking mechanism. The rotating mechanism is movably connected to the fixing mechanism, can rotate around its own axis arranged in the longitudinal direction of the control handle, includes a front pull wire fixing part and a rear pull wire fixing part, respectively fixes one pair of pull wires, drives the corresponding pull wire to move in the longitudinal direction of the control handle through rotation, controls the deformation of the front end of the catheter body by controlling the tension and relaxation of the corresponding pull wire, and generates bending of different angles. The self-locking mechanism includes a wave-shaped gasket and two movable gaskets. The wave-shaped gasket and the two movable gaskets are movably connected to the fixing mechanism, and can rotate around their own axes arranged in the longitudinal direction of the control handle. The wave-shaped gasket is located between the two movable gaskets, and is axially connected with the front pull wire fixing part and the rear pull wire fixing part in series. The friction force between the front pull wire fixing part, the rear pull wire fixing part and the adjacent elements is increased through the elasticity of the wave-shaped gasket, so as to realize self-locking of the control handle.

[0007] Preferably, the rotating mechanism further includes two rotating shafts, guide wheels, and multiple cylindrical pins; the front pull cable fixing member and the rear pull cable fixing member are located in front of and behind the guide wheels, respectively; each rotating shaft is movably connected to the fixing mechanism and can rotate about its own axis arranged horizontally along the control handle; the two rotating shafts are arranged longitudinally along the control handle and correspond to the front pull cable fixing member and the rear pull cable fixing member, respectively; the guide wheel is connected to the fixing mechanism and cannot rotate; the guide wheel has a pull cable outlet arranged longitudinally; multiple cylindrical pins are installed on the outer circumference of the guide wheel and can rotate along their own axes; one pair of pull cables passes over the rotating shaft located in front and extends out from the pull cable outlet, then passes over the cylindrical pins in opposite directions and is fixed to the front pull cable fixing member; another pair of pull cables passes over the rotating shaft located behind and extends out from the pull cable outlet, then passes over the cylindrical pins in opposite directions and is fixed to the rear pull cable fixing member, so that the front pull cable fixing member and the rear pull cable fixing member fix and control one pair of pull cables, respectively.

[0008] Preferably, the fixing mechanism includes a handle housing and a slotted cylinder located at the front end of the handle housing. The front end of the slotted cylinder has a central groove along the longitudinal direction and two pivot holes along the transverse direction to install two pivots respectively.

[0009] Preferably, a retaining ring is provided in front of the front cable fixing member, and the self-locking mechanism is located between the front cable fixing member and the retaining ring. The retaining ring is fixed on the slotted cylinder, and the two movable pads are located between the retaining ring and the front cable fixing member. The elasticity of the wave-shaped pad pushes the rear movable pad to push the front cable fixing member, thereby increasing the friction between the front cable fixing member, the guide wheel and the rear cable fixing member, so as to achieve the self-locking of the control handle.

[0010] Preferably, the rotating mechanism further includes a front rotating wheel and a rear rotating wheel, which are respectively sleeved and fixed on the front and rear pull wire fixing parts for the operator to perform rotation operations.

[0011] Preferably, the front rotating wheel and the rear rotating wheel form a receiving cavity, and the self-locking mechanism, the front pull cable fixing member, the rotating shaft, the guide wheel, multiple cylindrical pins, and the rear pull cable fixing member are received in the receiving cavity.

[0012] Preferably, the rotating mechanism further includes a front rotating wheel and a rear rotating wheel, which are respectively sleeved and fixed on the front and rear cable fixing members for the operator to perform rotation operations; the control handle further includes an adapter sleeve and a transmission sleeve, which is sleeved on a slotted cylinder and can rotate on the slotted cylinder along its own axis; the front cable fixing member, guide wheel, rear cable fixing member, and adapter sleeve are sequentially assembled on the transmission sleeve, wherein the guide wheel and rear cable fixing member can rotate on the transmission sleeve along their own axis; the transmission sleeve is provided with two U-shaped grooves for two pairs of cable extensions; the front rotating wheel and The adapter sleeve is rigidly connected to the transmission sleeve. The front cable fixing component is movably connected to the transmission sleeve. The front cable fixing component can move axially along the transmission sleeve but cannot rotate. Through this structure, the rotational motion from the front rotating wheel is transmitted to the front cable fixing component via the transmission sleeve. The rear rotating wheel is rigidly connected to the rear cable fixing component, and the two rotate synchronously. The two pairs of cables pass through the two rotating shafts and extend out from the two U-shaped grooves on the transmission sleeve, then extend out from the cable outlet of the guide wheel, and then pass through the cylindrical pin to fix the two pairs of cables to the front cable fixing component and the rear cable fixing component respectively.

[0013] Preferably, the front rotating wheel, the rear rotating wheel and the front part of the handle housing form a receiving cavity, and the adapter sleeve, the self-locking mechanism, the rear cable fixing member, the guide wheel and the front cable fixing member are received in the receiving cavity.

[0014] Preferably, the self-locking mechanism is located between the rear cable fixing member and the adapter sleeve. A retaining ring is provided in front of the adapter sleeve and the retaining ring is fixed on the slotted cylinder. The wave-shaped gasket is located between two movable gaskets. The elasticity of the wave-shaped gasket pushes the movable gasket behind it to push the rear cable fixing member, thereby increasing the friction between the rear cable fixing member, the guide wheel and the front cable fixing member, so as to realize the self-locking of the control handle.

[0015] An intracardiac ultrasound catheter includes a catheter body and a control handle connected to the rear end of the catheter body. The catheter body has four drawstring cavities spaced 90° apart, and each drawstring cavity is provided with a drawstring that can move freely within the drawstring cavity. One end of each drawstring is fixed to the front end of the catheter body, and drawstrings spaced 180° apart form a pair, forming two pairs. The control handle is the control handle of the intracardiac ultrasound catheter as described above.

[0016] Compared with the prior art, the intracardiac ultrasound catheter and control handle of this utility model increase the friction between the front pull wire fixing component, the rear pull wire fixing component and adjacent components through a self-locking mechanism including a waveform pad and two movable pads, so as to achieve self-locking of the control handle. It has a simple structure, is easy to operate and has a good self-locking effect. Attached Figure Description

[0017] 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 some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an intracardiac ultrasound catheter according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the structure of the catheter tip in an intracardiac ultrasound catheter is shown.

[0020] Figure 3 for Figure 1 A schematic diagram of the catheter body in an intracardiac ultrasound catheter is shown.

[0021] Figure 4 for Figure 1 A schematic diagram of another structure in the catheter body of the intracardiac ultrasound catheter shown;

[0022] Figure 5 for Figure 1 An exploded perspective view of the control handle in the intracardiac ultrasound catheter of Embodiment 1.

[0023] Figure 6 for Figure 5 A perspective view of the control handle partially assembled according to Embodiment 1 shown;

[0024] Figure 7 for Figure 5 A perspective view of a further partial assembly of the control handle embodiment 1 shown;

[0025] Figure 8 for Figure 5 The cross-sectional view of the control handle embodiment 1 after complete assembly is shown;

[0026] Figure 9 for Figure 1 An exploded perspective view of the control handle in the intracardiac ultrasound catheter, Example 2.

[0027] Figure 10 for Figure 9 The cross-sectional view of the control handle embodiment 2 after complete assembly is shown. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0030] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0032] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0033] like Figures 1 to 4As shown, this embodiment of the present invention provides an intracardiac ultrasound catheter, which includes a catheter tip 1, a catheter body 2, a control handle 3, a communication unit 4, and a connector plug 5. The catheter tip 1 includes an ultrasound unit 11, two magnetic positioning sensors 12 arranged in an "X" shape, and a protective layer 13 covering the ultrasound unit 11 and the magnetic positioning sensors 12. In this embodiment, the protective layer 13 is made of block polyamide. The ultrasound unit 11 is used to provide ultrasound imaging, and the magnetic positioning sensors 12 can provide positioning information for a three-dimensional cardiac electrophysiological mapping system. The electrical signals generated by the ultrasound unit 11 and the magnetic positioning sensors 12 are transmitted to the connector plug 5 via the communication unit 4. The signals from the connector plug 5 are transmitted to the three-dimensional electrophysiological mapping system and the ultrasound host via a matching connecting cable, enabling imaging of the heart and great vessels, ultrasound imaging of other instruments within the heart, and positioning of the catheter within the cardiac chamber.

[0034] The catheter body 2 has a multi-layered structure. The inner layer 21 can be made of any suitable material, including, for example, polytetrafluoroethylene (PTFE). The inner side of the inner layer 21 forms a central lumen 20, which can be circular in shape (e.g., ...). Figure 3 ) or other shapes (such as Figure 4 The outer layer is a braided layer 22. Between the inner layer 21 and the braided layer 22 are four pull-cord cavities 25, spaced 90° apart, to accommodate four pull-cords. These four pull-cords are spaced 90° apart at the front end of the fixed catheter body, forming two pairs, each pair spaced 180° apart. The pull-cords 24 are arranged within the pull-cord cavities 25 and can move freely. The braided layer 22 expands the inner lumen while providing strong support and flexural strength. The outer layer 23 can include materials with different hardness for different segments of the catheter body 2 to provide different flexibility characteristics. The material contains a certain proportion (e.g., 25%) of barium sulfate and is visible under X-ray. The catheter body 2 includes an adjustable bend section and a reinforcing section. The principle of catheter bend adjustment is to fix one end of the pull wire 24 on the tube wall to the front end of the catheter body 2, and extend the other end from the rear end of the catheter body 2. Then, the tension and relaxation of the pull wire 24 are controlled by the control handle 3 to control the deformation of the front end of the catheter body 2, so that the catheter tip 1 can reach any part of the heart.

[0035] In this embodiment, each magnetic positioning sensor 12 is a 5-DOF sensor. The two magnetic positioning sensors 12 are arranged in an "X" shape with an included angle of more than 40°, thereby achieving higher spin angle accuracy (the included angle between two traditional 5-DOF sensors does not exceed 20°), and thus having higher positioning accuracy, enabling the ultrasound unit 11 to accurately reach the lesion location.

[0036] In this embodiment, each magnetic positioning sensor 12 is a 5-DOF sensor. The two magnetic positioning sensors 12 are arranged in an "X" shape with an included angle greater than or equal to 40°, thereby achieving higher spin angle accuracy (the included angle between two traditional 5-DOF sensors does not exceed 20°), and thus having higher positioning accuracy, enabling the ultrasound unit 11 to accurately reach the lesion location.

[0037] Figures 5 to 8 The image shown is Example 1 of the control handle for the intracardiac ultrasound catheter in this embodiment.

[0038] like Figures 5 to 8 As shown, the control handle includes a fixing mechanism and a rotating mechanism. The rotating mechanism is movably connected to the fixing mechanism and can rotate around its own axis, which is set along the longitudinal direction of the control handle. The ends of each pull wire are fixed to the corresponding rotating mechanism. When the rotating mechanism rotates, it drives the corresponding pull wire to move along the longitudinal direction of the control handle, so as to control the deformation of the front end of the conduit body by manipulating the tension and relaxation of the corresponding pull wire, thereby producing a bend at different angles.

[0039] Specifically, in this embodiment, the rotating mechanism includes a rotating wheel, a cable fixing member, a rotating shaft 311, a guide wheel 308, and a plurality of cylindrical pins 309. The fixing mechanism includes a handle housing 312 and a slotted cylinder 318 located at the front end of the handle housing 312. The front end of the slotted cylinder 318 has a central groove along the longitudinal direction and a rotating shaft hole 316 along the transverse direction for mounting the rotating shaft 311.

[0040] In this embodiment, since there are two pairs of pull wires 24, the rotating wheel includes a front rotating wheel 302 and a rear rotating wheel 303, the pull wire fixing components include a front pull wire fixing component 307 and a rear pull wire fixing component 310, there are two rotating shafts 311, and there are also two rotating shaft holes 316. If there are not two pairs of pull wires, the above structure needs to be adjusted according to the number of pull wires, which should be known by those skilled in the art based on the above description, and will not be repeated here.

[0041] In this embodiment, a retaining ring 304 is provided in front of the front cable fixing member 307, and a self-locking mechanism is provided between the front cable fixing member 307 and the retaining ring 304. The self-locking mechanism includes a wave-shaped washer 306 and two movable washers 305. The retaining ring 304 is fixed on the slotted cylinder 318, the two movable washers 305 are located between the retaining ring 304 and the front cable fixing member 307, and the wave-shaped washer 306 is located between the two movable washers 305.

[0042] In this embodiment, the rear end of the conduit body 2 is fixed on the slotted cylinder 318, which is located at the front end of the handle housing 312. Two rotating shafts 311 are inserted into two rotating shaft holes 316 on the slotted cylinder 318. The front cable fixing member 307, the guide wheel 308, and the rear cable fixing member 310 are sequentially mounted on the slotted cylinder 318. The front cable fixing member 307 and the rear cable fixing member 310 can rotate on the slotted cylinder 318, while the guide wheel 308 cannot rotate relative to the slotted cylinder 318. Two pairs of pull wires 24 pass over two rotating shafts 311 (which can rotate along their own axis within the holes of the slotted cylinder 318) and extend from the pull wire outlet 317 of the guide wheel 308. They then pass over a cylindrical pin 309 (which can rotate along its own axis on the guide wheel 308) and are fixed to the pull wire fixing posts 313 and 314 on the front pull wire fixing member 307 and the rear pull wire fixing member 310, respectively. When the pull wires 24 slide across the surfaces of the rotating shafts 311 and the cylindrical pins 309, the relative friction is rolling friction, making operation more effortless. The front rotating wheel 302 and the rear rotating wheel 303 are connected to the pull wire fixing posts 313 and 314 on the front pull wire fixing member 307 and the rear pull wire fixing member 310, respectively. The connection method is not limited to snap-fit ​​or adhesive bonding. The strain relief sleeve 301 is fixed to the front end of the slotted cylinder 318. When the front rotating wheel 302 is rotated, it will cause the connected front cable fixing member 307 to rotate together. The cable fixing member post 313 on the front cable fixing member 307 will pull the cable 24 fixed thereon. The cable 24 will cause the front end of the conduit to deform, producing a bend at different angles. Similarly, when the rear rotating wheel 303 is rotated, it will cause the connected rear cable fixing member 310 to rotate together. The cable fixing member post 314 on the rear cable fixing member 310 will pull the cable 24 fixed thereon. The cable 24 will cause the front end of the conduit to deform, producing a bend at different angles.

[0043] The front and rear rotating wheels are used for rotational operation by the operator. In other embodiments, the front and rear rotating wheels may be omitted, and the front and rear cable fixing components may be operated directly. In this case, the structure of the front and rear cable fixing components would be more complex. Furthermore, in this embodiment, the front and rear rotating wheels form a receiving cavity, which houses the self-locking mechanism, the front cable fixing component, the rotating shaft, the guide wheel, multiple cylindrical pins, and the rear cable fixing component, thus protecting these parts. The front and rear rotating wheels and the handle housing overlap each other.

[0044] The retaining ring 304 is inserted into the slot 315 of the slotted cylinder 318, and the wave-shaped washer 306 is located between the two movable washers 305. The retaining ring 304 restricts these components to the cylinder of the handle housing 312 with a certain pre-pressure. The pre-pressure of the wave-shaped washer 306 increases the friction between the front cable fixing member 307, the guide wheel 308 and the rear cable fixing member 310, so as to realize the self-locking function of the handle.

[0045] Figures 9 to 10 The image shown is Example 2 of the control handle for the intracardiac ultrasound catheter in this embodiment.

[0046] like Figures 9 to 10 As shown, the control handle includes a fixing mechanism and a rotating mechanism. The rotating mechanism is movably connected to the fixing mechanism and can rotate around its own axis, which is set along the longitudinal direction of the control handle. The ends of each pull wire are fixed to the corresponding rotating mechanism. When the rotating mechanism rotates, it drives the corresponding pull wire to move along the longitudinal direction of the control handle, so as to control the deformation of the front end of the conduit body by manipulating the tension and relaxation of the corresponding pull wire, thereby producing a bend at different angles.

[0047] Specifically, in this embodiment, the control handle structure is modified by adding an adapter sleeve 319 and a transmission sleeve 320 compared to embodiment 1. This allows the guide wheel 308 and the front cable fixing member 307 to be placed inside the handle housing 312, reducing the width and outer diameter of the front rotating wheel 302 and the rear rotating wheel 303, thus achieving a miniaturized handle design. The front rotating wheel 302, the rear rotating wheel 303, and the front part of the handle housing 312 form a receiving cavity, in which parts such as the retaining ring 304, the adapter sleeve 319, the self-locking mechanism, the rear cable fixing member 310, the guide wheel 308, and the front cable fixing member 307 are housed.

[0048] In this embodiment, the transmission sleeve 320 is fitted onto the slotted cylinder 318 and can rotate freely on the slotted cylinder 318. The front cable fixing component 307, guide wheel 308, rear cable fixing component 310, gasket 305, corrugated gasket 306, gasket 305, and adapter sleeve 319 are sequentially assembled onto the transmission sleeve 320. The guide wheel 308, front cable fixing component 307, gasket 305, corrugated gasket 306, and gasket 305 can rotate freely and move axially on the transmission sleeve 320. These components are fixed to the slotted cylinder 318 by a shaft elastic retaining ring 304. The transmission sleeve 320 has two U-shaped grooves 321 for two pairs of cable extensions. The front rotating wheel 302 and the adapter sleeve 319 are rigidly connected. The adapter sleeve 319 is rigidly connected to the transmission sleeve 320. The front cable fixing member 307 is connected to the transmission sleeve 320 through the transmission protrusion 323 and the transmission groove 322. The front cable fixing member 307 can move axially along the transmission sleeve 320 but cannot rotate. Through this structure, the rotational motion from the front rotating wheel 302 can be transmitted to the front cable fixing member 307 via the transmission sleeve 320. The rear rotating wheel 303 and the rear cable fixing member 310 are directly rigidly connected, and the two rotate synchronously. The two pairs of cables 24 pass over the two rotating shafts 311 and extend out from the two U-shaped grooves 321 on the transmission sleeve 320, then extend out from the cable outlet 317 of the guide wheel 308, and then pass over the cylindrical pin 309 to fix the two pairs of cables 24 to the cable fixing posts 313 on the front cable fixing member 307 and the rear cable fixing member 310, respectively. The principle of bending adjustment is basically the same as that in Example 1.

[0049] The self-locking mechanism in this embodiment differs slightly from that in Embodiment 1. In this embodiment, the self-locking mechanism is located between the rear cable fixing member 310 and the adapter sleeve 319. A retaining ring 304 is provided in front of the adapter sleeve 319. The retaining ring 304 is fixed on the slotted cylinder 318. The wave-shaped gasket 306 is located between two movable gaskets 305. The elasticity of the wave-shaped gasket 306 pushes the movable gasket 305 behind it to push the rear cable fixing member 310, thereby increasing the friction between the rear cable fixing member 310, the guide wheel 308, and the front cable fixing member 307 to achieve self-locking of the control handle.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control handle for an intracardiac ultrasound catheter, used to connect to the rear end of the catheter body of the intracardiac ultrasound catheter, controlling the deformation of the front end of the catheter body, wherein the catheter body has four drawstring cavities spaced 90° apart, each drawstring cavity containing a drawstring that can move freely within the drawstring cavity; one end of each drawstring is fixed to the front end of the catheter body, and drawstrings spaced 180° apart form a pair, forming two pairs; characterized in that, The control handle fixes the other end of each of the pull cables and includes a fixing mechanism, a rotating mechanism, and a self-locking mechanism. The rotating mechanism is movably connected to the fixing mechanism and can rotate around its own axis arranged longitudinally along the control handle. It includes a front pull cable fixing member and a rear pull cable fixing member, which respectively fix one pair of pull cables. By rotating, the corresponding pull cables move longitudinally along the control handle to control the tension and relaxation of the corresponding pull cables, thereby controlling the deformation of the front end of the conduit body and producing different angle bends. The self-locking mechanism includes a wave-shaped washer and two movable washers. The wave-shaped washer and the two movable washers are movably connected to the fixing mechanism and can rotate around their own axis arranged longitudinally along the control handle. The wave-shaped washer is located between the two movable washers and is axially connected in series with the front pull cable fixing member and the rear pull cable fixing member. The elasticity of the wave-shaped washer increases the friction between the front pull cable fixing member, the rear pull cable fixing member, and adjacent components, thereby achieving self-locking of the control handle.

2. The control handle of the intracardiac ultrasound catheter as described in claim 1, characterized in that, The rotating mechanism further includes two rotating shafts, guide wheels, and multiple cylindrical pins; the front and rear cable fixing components are located in front of and behind the guide wheels, respectively; each rotating shaft is movably connected to the fixing mechanism and can rotate around its own axis arranged laterally along the control handle; the two rotating shafts are arranged longitudinally along the control handle and correspond to the front and rear cable fixing components, respectively; the guide wheel is connected to the fixing mechanism and cannot rotate; the guide wheel has a longitudinally arranged cable outlet; multiple cylindrical pins are installed on the outer circumference of the guide wheel and can rotate along their own axes; one pair of cables passes over the rotating shaft located in front and extends out from the cable outlet, then passes over the cylindrical pins in opposite directions and is fixed to the front cable fixing component; another pair of cables passes over the rotating shaft located behind and extends out from the cable outlet, then passes over the cylindrical pins in opposite directions and is fixed to the rear cable fixing component, so that the front and rear cable fixing components fix and control one pair of cables, respectively.

3. The control handle of the intracardiac ultrasound catheter as described in claim 2, characterized in that, The fixing mechanism includes a handle housing and a slotted cylinder located at the front end of the handle housing. The front end of the slotted cylinder has a central groove along the longitudinal direction and two pivot holes along the transverse direction to install two pivots respectively.

4. The control handle of the intracardiac ultrasound catheter as described in claim 3, characterized in that, A retaining ring is provided in front of the front cable fixing component. The self-locking mechanism is located between the front cable fixing component and the retaining ring. The retaining ring is fixed on the slotted cylinder. Two movable pads are located between the retaining ring and the front cable fixing component. The elasticity of the wave-shaped pads pushes the movable pads behind to push the front cable fixing component, thereby increasing the friction between the front cable fixing component, the guide wheel, and the rear cable fixing component to achieve self-locking of the control handle.

5. The control handle of the intracardiac ultrasound catheter as described in claim 4, characterized in that, The rotating mechanism also includes a front rotating wheel and a rear rotating wheel, which are respectively sleeved and fixed on the front and rear pull wire fixing parts for the operator to perform rotation operations.

6. The control handle of the intracardiac ultrasound catheter as described in claim 5, characterized in that, The front rotating wheel and the rear rotating wheel form a receiving cavity, in which the self-locking mechanism, the front pull cable fixing component, the rotating shaft, the guide wheel, multiple cylindrical pins, and the rear pull cable fixing component are housed.

7. The control handle of the intracardiac ultrasound catheter as described in claim 3, characterized in that, The rotating mechanism further includes a front rotating wheel and a rear rotating wheel, which are respectively fitted and fixed on the front and rear cable fixing parts for the operator to perform rotation operations; the control handle further includes an adapter sleeve and a transmission sleeve, which is fitted on a slotted cylinder and can rotate on the slotted cylinder along its own axis; the front cable fixing part, guide wheel, rear cable fixing part, and adapter sleeve are sequentially assembled on the transmission sleeve, wherein the guide wheel and rear cable fixing part can rotate on the transmission sleeve along their own axis; the transmission sleeve is provided with two U-shaped grooves for the two pairs of cables to extend out; the front rotating wheel and the adapter sleeve... The sleeve is rigidly connected to the adapter sleeve and the transmission sleeve. The front cable fixing component is movably connected to the transmission sleeve. The front cable fixing component can move axially along the transmission sleeve, but cannot rotate. Through this structure, the rotational motion from the front rotating wheel is transmitted to the front cable fixing component via the transmission sleeve. The rear rotating wheel is rigidly connected to the rear cable fixing component, and the two rotate synchronously. The two pairs of cables pass through the two rotating shafts and extend out from the two U-shaped grooves on the transmission sleeve, then extend out from the cable outlet of the guide wheel, and then pass through the cylindrical pin to fix the two pairs of cables to the front cable fixing component and the rear cable fixing component, respectively.

8. The control handle of the intracardiac ultrasound catheter as described in claim 7, characterized in that, The front rotating wheel, the rear rotating wheel and the front part of the handle housing form a receiving cavity, and the adapter sleeve, the self-locking mechanism, the rear cable fixing component, the guide wheel and the front cable fixing component are received in the receiving cavity.

9. The control handle of the intracardiac ultrasound catheter as described in claim 7, characterized in that, The self-locking mechanism is located between the rear cable fixing component and the adapter sleeve. A retaining ring is provided in front of the adapter sleeve and is fixed on the slotted cylinder. The wave-shaped gasket is located between two movable gaskets. The elasticity of the wave-shaped gasket pushes the movable gasket behind it to push the rear cable fixing component, thereby increasing the friction between the rear cable fixing component, the guide wheel, and the front cable fixing component to achieve self-locking of the control handle.

10. An intracardiac ultrasound catheter, characterized in that, The catheter includes a catheter body and a control handle connected to the rear end of the catheter body. The catheter body has four pull-wire cavities spaced 90° apart. Each pull-wire cavity is provided with a pull-wire that can move freely within the pull-wire cavity. One end of each pull-wire is fixed to the front end of the catheter body. Pull-wires spaced 180° apart form a pair, forming two pairs. The control handle is the control handle of the intracardiac ultrasound catheter as described in any one of claims 1 to 9.

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