Balloon catheter

Abstract

Provided in the present disclosure is a balloon catheter, comprising: a catheter body, which defines a proximal portion and a distal portion, and a balloon, a connector, and an acting component, wherein a distal end of the acting component is at least partially arranged in the catheter body, and the distal end of the acting component is fixedly connected to a distal end of the balloon; and a connecting portion is provided between the proximal portion of the catheter body and the distal portion of the catheter body, and the distal portion of the catheter body is movable relative to the proximal portion of the catheter body. The balloon catheter provided in the present disclosure enables the balloon to have a relatively small radial dimension after being deflated and contracted, facilitating the withdrawal of the balloon into a guiding catheter; and the balloon catheter has a simple structure, is safe and reliable, and is convenient for an operator to operate.

Description

A balloon catheter Technical Field

[0001] The present disclosure relates to the technical field of medical devices, and in particular to a balloon catheter. Background Art

[0002] Balloon catheters are commonly used in interventional medical procedures such as ablation, angioplasty / dilation, and intracavitary drug delivery and occlusion. Prior to use, the balloon is deflated and folded, requiring guidance into the body through a guide tube (e.g., the instrument channel of a bronchoscope used in bronchial cryoablation). During use, inflation expands the balloon, allowing it to adhere to the target tissue, increasing the contact area and enabling the appropriate treatment.

[0003] In the prior art, balloon folding typically involves forming multiple wings on the balloon surface, resulting in a smaller size before use and a larger surface area after inflation. Ideally, the balloon itself would collapse and fold along the pre-use flaps after being deflated, thereby achieving a smaller radial dimension. This would allow the balloon to be withdrawn into the guide tube after use, transferred along with the guide tube to another treatment site, and then extended from the guide tube again for treatment; or removed from the patient's organ or tissue along with the guide tube to complete the treatment. However, in reality, during the balloon deflation process, the air will cause the non-winged parts of the balloon to gather directly in the middle, preventing the balloon from collapsing and folding along the initial flap shape, or even causing it to gather into a ball. This results in the balloon's radial dimension after deflation being much larger than that in the initial folded state, making it impossible to directly withdraw it into the guide tube. This can lead to inconvenience in operation, prolonged surgery time, and difficulty in achieving the treatment effect. In severe cases, complications may occur.

[0004] In view of this, the present disclosure desires to provide a balloon catheter that can have a smaller radial dimension after the balloon is deflated to facilitate removal and / or repositioning. Summary of the Invention

[0005] In order to overcome the above problems, the present disclosure proposes a balloon catheter so that the balloon can have a smaller radial size after being deflated.

[0006] Specifically, the present disclosure proposes a balloon catheter, which includes: a catheter body defining a proximal part and a distal part, a balloon, and an action component; the distal end of the action component is at least partially arranged in the catheter body, and the distal end of the action component is fixedly connected to the distal end of the balloon and does not undergo relative axial movement; wherein, the distal part of the catheter body is connected to the proximal end of the balloon, and the distal part of the catheter body is movable relative to the proximal part of the catheter body.

[0007] As a variation of the above embodiment, the distal end of the action component and the distal end of the balloon are independent of each other and can undergo relative displacement; the maximum value of the relative displacement is less than the maximum axial displacement value of the distal end portion of the catheter body relative to the proximal end portion of the catheter body. It should be specifically explained that the independence of the distal end of the action component and the distal end of the balloon means that the distal end of the action component and the distal end of the balloon are in a completely separated (non-contact) state at least at a certain position, for example: there is no connection between the distal end of the action component and the distal end of the balloon; or, the distal end of the action component and the distal end of the balloon are indirectly connected through at least one deformable member (such as a spring), and it is ensured that the distal end of the action component and the distal end of the balloon are in a completely separated (non-contact) state.

[0008] Furthermore, a connecting portion is provided between the proximal end portion of the catheter body and the distal end portion of the catheter body.

[0009] Furthermore, the connecting portion may be at least one of a bellows structure, a sleeve expansion joint provided with a stuffing box seal, a rubber tube, a silicone tube, a telescopic nylon tube, a balloon, and a fiber fabric expansion joint, or a combination thereof.

[0010] Furthermore, the balloon catheter further comprises a connector, the proximal end portion of the catheter body is at least partially disposed in the connector, and the connector and the distal end portion of the catheter body are relatively movable axially.

[0011] Furthermore, the action component and the working medium supply pipeline are the same component or different components, preferably the same component.

[0012] Furthermore, the balloon catheter is also provided with a working fluid reflux pipeline and / or a vacuum layer.

[0013] As another optional alternative, a balloon catheter comprises: a catheter body defining a proximal portion and a distal portion, and a balloon; the distal portion of the catheter body is directly / indirectly connected to the proximal end of the balloon and the distal portion of the catheter body is movable relative to the proximal portion of the catheter body, wherein the distal end of the balloon and the proximal portion of the catheter body are respectively provided with magnetic components and the forces acting on them repel each other.

[0014] Furthermore, the magnetic component is at least one of a permanent magnet and an electromagnet, or a combination thereof.

[0015] As another alternative to the above-mentioned scheme, a balloon catheter comprises: a catheter body defining a proximal part and a distal part, and a balloon; the distal part of the catheter body is directly / indirectly connected to the proximal end of the balloon, wherein the distal end of the balloon and the distal part of the catheter body are respectively provided with magnetic components and the forces acting on them repel each other.

[0016] Furthermore, at least one of the magnetic components is an electromagnet, and the presence, strength and direction of magnetism are controlled by controlling the electrical physical quantity (such as current) of the electromagnet.

[0017] As another alternative to the above-mentioned scheme, a balloon catheter comprises: a catheter body defining a proximal part and a distal part, a balloon, and an action component; the distal end of the action component is at least partially disposed within the catheter body, and magnetic components are respectively provided at the distal end of the action component and the distal part of the catheter body, and the action forces repel each other, wherein the distal part of the catheter body is directly / indirectly connected to the proximal end of the balloon and the distal part of the catheter body is movable relative to the proximal part of the catheter body.

[0018] Furthermore, in the aforementioned technical solution, the distal end portion of the catheter body is fixed to the proximal end of the balloon by welding.

[0019] Technical Effects

[0020] Due to the adoption of the above technology, the present disclosure has the following positive effects compared with the prior art:

[0021] (1) The present invention controls the distal end of the catheter body to produce axial displacement relative to the proximal end of the catheter body or utilizes repulsive magnetic forces to achieve the balloon collapsing and folding along the initial folded wing shape during the balloon deflation process, and the radial size after deflation is equal to or close to the radial size in the initial folded state, ensuring that the balloon can be smoothly withdrawn to the guide tube.

[0022] (2) Regarding the scheme of using the control method to generate axial displacement of the distal end portion of the catheter body relative to the proximal end portion of the catheter body, this scheme is easy to operate and has a fast response speed.

[0023] (3) In the scheme of utilizing repulsive magnetic forces, on the one hand, the number of active components can be reduced and the structure can be simplified; on the other hand, the magnetic field can be controlled by controlling the electrical parameters, which is convenient for coordinating with the pumping speed to control the balloon folding mode and speed.

[0024] (4) The balloon catheter disclosed herein has a simple overall structure and is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] FIG1 is a schematic diagram of the overall structure of a balloon catheter disclosed in the present invention.

[0027] FIG. 2 is a front view of the first embodiment of the balloon catheter of the present disclosure.

[0028] FIG3 is an enlarged partial cross-sectional view of the balloon catheter at point A in FIG2 , in which the balloon is in an expanded state.

[0029] FIG4 is an enlarged partial cross-sectional view corresponding to FIG3 , in which the balloon is in a deflated state.

[0030] FIG5 is an enlarged partial cross-sectional view of the balloon catheter at point B in FIG2 , in which the connecting portion is in the longest extended state.

[0031] FIG6 is an enlarged partial cross-sectional view corresponding to FIG5 , in which the connecting portion is in the shortest telescopic state.

[0032] FIG7 shows a state where the distal end of the action component and the distal end of the balloon are independent of each other and are axially farthest apart from each other.

[0033] FIG8 is a front view of a second embodiment of a balloon catheter according to the present disclosure.

[0034] FIG. 9 is a front view of a third embodiment of a balloon catheter according to the present disclosure.

[0035] 10 to 12 are enlarged cross-sectional views of the balloon in the balloon catheter.

[0036] FIG13 is a front view of a deformed structure of the third embodiment of the balloon catheter disclosed herein. DETAILED DESCRIPTION

[0037] Various aspects and features of the present disclosure are described herein with reference to the accompanying drawings.

[0038] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0039] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0040] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0041] It should also be understood that although the present disclosure has been described with reference to certain specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the characteristics recited in the claims and are therefore within the scope of protection defined thereby.

[0042] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0043] Specific embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repetitive functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant detail. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but rather serve merely as a basis and representative basis for teaching those skilled in the art to employ the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0044] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," which may all refer to one or more of the same or different embodiments according to the present disclosure.

[0045] First embodiment:

[0046] 1 to 6 , an embodiment of the present disclosure provides a balloon catheter comprising an elongated catheter body 1, a balloon 2 capable of expanding by injecting a fluid or contracting by discharging a fluid, and an active component 3 at least partially disposed within the catheter body 1. The catheter body 1 may define a proximal portion 10 and a distal portion 11, and may include at least one passage or lumen therein for mechanical, electrical, and / or fluid functions, or a combination thereof. For example, a fluid supply line 31, a fluid discharge lumen 32, and a vacuum chamber 33 (not shown in the drawings for ease of visualization) may be disposed within the catheter body 1. A connector 5 is disposed between the proximal portion 10 and the distal portion 11 of the catheter body 1, connecting the proximal portion 10 to the distal portion 11 via the connector 5. The connector 5 allows relative axial movement between the proximal portion 10 and the distal portion 11 of the catheter body 1.

[0047] A connector 4 is provided on the proximal portion 10 of the catheter body 1 , and the proximal end of the active component 3 is fixedly connected to the connector 4 . When the balloon catheter is in use, the connector 4 can be docked and fixed with an external device.

[0048] Furthermore, the balloon 2 is at least partially disposed on the distal portion 11 of the catheter body 1. Specifically, the balloon 2 and the distal portion 11 of the catheter body 1 can be directly or indirectly connected by welding, adhesion or other methods.

[0049] Figures 3-4 show the expanded state and the contracted state of the balloon. When the working fluid is input into the balloon 2 to achieve expansion, the radial expansion of the balloon 2 will pull the distal end and the proximal end of the balloon 2 closer to each other, and the axial length of the balloon 2 in the expanded state will be slightly shorter than the axial length in the contracted state.

[0050] As shown in Figures 1-6, the connecting portion 5 can be extended and moved along the axial direction of the catheter body 1; since the connector 4 located on the proximal portion 10 of the catheter body 1 is connected and fixed to the external device, the proximal portion 10 remains fixed in position relative to the external device. When the balloon 2 needs to be withdrawn toward the connector 4, the distal portion 11 is pulled toward the proximal direction of the catheter body 1. At this time, the distal portion 11 of the catheter body 1 moves toward the connector 4 relative to the proximal portion 10 of the catheter body 1, thereby at least driving the proximal portion 10 of the balloon 2 to move axially toward the proximal direction of the catheter body 1. Since the balloon 2 moves axially or is axially tightened relative to the action component 3, the action component 3 presses against the distal end of the balloon 2 and forms a limiting effect on the distal end of the balloon 2, ensuring that the working medium in the balloon 2 can be smoothly sucked out and collapses and folds along the initial folding shape. Finally, the radial size of the balloon 2 after deflating is equal to or close to the radial size in the initial folded state, and it is smoothly withdrawn to the guide tube.

[0051] 3-4, the distal end of the action component 3 is fixedly connected to the distal end of the balloon 2; or, as another variation, as shown in FIG5-7, the distal end of the action component 3 is independent of the distal end of the balloon 2 and can undergo axial relative displacement, and the maximum value X1 of the axial relative displacement is less than the maximum axial displacement value X2 of the distal end portion 11 of the catheter body 1 relative to the proximal end portion 10 of the catheter body 1, wherein X2 is equal to the difference between the longest length X4 and the shortest length X3 of the connecting portion 5 after extension in the axial direction; when the balloon 2 begins to withdraw, the distal end portion 11 of the catheter body 1 is pulled to make the balloon 2 move axially toward the proximal direction. When the axial distance moved by the balloon 2 relative to the action component 3 is equal to the action component 3, the balloon 2 moves in the proximal direction in the axial direction. When the distal end of the component 3 and the distal end of the balloon 2 reach the maximum axial relative displacement X1, the distal end of the action component 3 begins to contact the distal end of the balloon 2. During this process, the axial distance that the balloon 2 moves relative to the action component 3 is equal to the axial distance that the distal end portion 11 of the catheter body 1 moves relative to the proximal end portion 10 of the catheter body 1; when the axial distance that the balloon 2 moves relative to the action component 3 is less than the axial distance between the distal end portion 11 of the catheter body and the proximal end 10 of the catheter body, the distal end of the action component 3 presses against the distal end of the balloon 2 and forms a limit on the distal end of the balloon 2, so that the radial dimension of the balloon 2 after deflation is equal to or close to the radial dimension in the initial folded state, and it can be smoothly withdrawn to the guide tube.

[0052] The action component 3 and the working fluid supply pipeline 31 may be the same pipeline or different pipelines; FIG3-7 shows that the action component 3 and the working fluid supply pipeline 31 are the same pipeline.

[0053] In addition, the catheter body 1 is also provided with other lumens; for example: a wire cavity can be provided to accommodate a wire to realize electrical signal transmission; a vacuum layer can also be provided to realize thermal insulation; a bronchial tube can also be provided for working fluid flow path planning; its lumen setting location can be set only in the proximal part 10 of the catheter body 1, or can be set only in the distal part 11 of the catheter body 1, or respectively arranged in the proximal part 10 and the distal part 11 of the catheter body. Its specific setting is arranged based on actual needs to meet the requirements of temperature measurement, pressure measurement or thermal insulation.

[0054] Furthermore, the distal end 11 of the catheter body 1 and the proximal end of the balloon 2 can be directly connected or indirectly connected, preferably directly connected. Furthermore, the distal end 11 of the catheter body 1 and the proximal end of the balloon 2 can be fixed by gluing, welding, threading, etc., preferably ultrasonic welding.

[0055] Among them, the connecting part 5 can be a bellows structure or a sleeve expansion joint or a rubber tube or a silicone tube or a telescopic nylon tube or a balloon or a fiber fabric expansion joint with a stuffing box seal, wherein Figure 2 shows that the connecting part 5 is a bellows structure; Figure 8 shows that the connecting part 5 is a balloon; Figure 9 shows that the connecting part 5 is a rubber tube; it should be noted that the present disclosure lists the above-mentioned various structural components that can realize the axial movement of the distal part of the catheter body relative to the proximal part of the catheter body, but is not limited to this. The deformation structures and combinations thereof for realizing the axial movement of the distal part of the catheter body relative to the proximal part of the catheter body are regarded as equivalent technical features of the corresponding technical means of this embodiment.

[0056] Second embodiment:

[0057] Referring to Figures 8 and 10, another embodiment of the present disclosure provides a balloon catheter, which includes: a catheter body 1 defining a proximal portion 10 and a distal portion 11, a balloon 2 that can expand and contract, an action component 3, and a connector 4 connected to the proximal portion 11 of the catheter body 1. The balloon catheter is connected to an external device via the connector 4, and a working fluid is transmitted to the catheter via the external device. The working fluid can be a low-temperature medium, such as liquid nitrogen; a room-temperature medium, such as physiological saline; or a high-temperature medium, such as water vapor. A working fluid supply line 31 is provided in the catheter body 1 to transport the working fluid to the balloon 2, and a working fluid discharge lumen 32 is provided to discharge the working medium. In this embodiment, the action component 3 and the working fluid supply line 31 are the same component. Of course, the action component 3 can also be provided separately.

[0058] The distal portion 11 of the catheter body 1 is directly / indirectly connected to the proximal end of the balloon 2, and the distal portion 11 of the catheter body 1 can move axially relative to the proximal end 10 of the catheter body 1, wherein the distal end of the balloon 2 and the distal portion 11 of the catheter body 1 are respectively provided with magnetic components and the forces acting on them repel each other.

[0059] It should be noted that, similar to the first embodiment, the connecting portion 5 in this embodiment can be a bellows structure or a sleeve expansion joint with a stuffing box seal, or a rubber tube, or a silicone tube, or a telescopic nylon tube, or a balloon, or a fiber fabric expansion joint, or a combination thereof.

[0060] Furthermore, as shown in FIG10 , a permanent magnet 6 is fixed to the distal end of the balloon 2, and a permanent magnet 7 is also fixed to the corresponding action component 3 at the position of the distal portion 11 of the catheter body 1, and the permanent magnet 6 and the permanent magnet 7 are axially oppositely arranged, and the relative magnetic poles are the same. The permanent magnet 6 can be fixedly arranged inside or outside the distal end of the balloon 2 or nested on the distal end of the balloon 2, and the permanent magnet 7 can also be fixedly mounted on the action component 3 or set at the distal end of the action component 3. Preferably, the permanent magnet 7 is fixedly arranged at the distal end of the action component 3, and the permanent magnet 6 is fixedly arranged inside the distal end of the balloon 2.

[0061] When the balloon 2 needs to be retracted, the distal part 11 of the catheter body 1 is pulled back in the direction of the connector 4, so that the balloon 2 fixed on the distal part 11 of the catheter body 1 moves axially toward the proximal direction of the catheter body 1. Since the action component 3 is fixed, the permanent magnet 6 at the distal part of the balloon 2 approaches the permanent magnet 7 on the action component 3. Since the opposite magnetic poles of the permanent magnet 6 and the permanent magnet 7 are the same, the distal end of the balloon 2 is supported by the magnetic force when it is stretched and retracted, thereby ensuring that the working medium in the balloon 2 can be smoothly sucked out, which is beneficial for the balloon 2 to collapse and fold along the initial folded wing shape, so that the radial size of the balloon 2 after deflating is equal to or close to the radial size in the initial folded state, and it can be smoothly retracted to the guide tube.

[0062] Third embodiment:

[0063] Referring to Figures 9 and 11-13, another embodiment of the present disclosure provides a balloon catheter comprising: a catheter body 1 defining a proximal portion 10 and a distal portion 11; an inflatable and deflable balloon 2; and a connector 4 connected to the proximal portion 11 of the catheter body 1. The balloon catheter is connected to an external device via the connector 4, and a working fluid is delivered to the catheter via the external device. The working fluid can be a low-temperature medium, such as liquid nitrogen; a room-temperature medium, such as saline; or a high-temperature medium, such as water vapor. A working fluid supply line 31 is provided within the catheter body 1 for delivering the working fluid to the balloon 2, and a working fluid discharge lumen 32 is provided for discharging the working fluid. Unlike the above-described embodiment, in this embodiment, the active component 3 may not be provided. Furthermore, as shown in Figure 13, the distal portion 11 of the catheter body 1 may not move relative to the proximal portion 10 of the catheter body 1.

[0064] In this example, the distal portion 11 of the catheter body 1 is directly / indirectly connected to the proximal end of the balloon 2, and as shown in Figures 11-12, magnetic components are respectively provided at the distal end of the balloon 2 and the distal portion 11 of the catheter body 1, and the acting forces repel each other, wherein at least one magnetic component is an electromagnet 8. Specifically, based on the type of magnetic component, its combination can be divided into permanent magnet-electromagnetic and electromagnetic-electromagnetic; wherein, based on the installation position and the type of magnetic component, a variety of arrangements can be formed. For example, referring to Figure 11, the electromagnetic-permanent magnet combination is respectively provided in the distal portion 11 of the catheter body 1 and on the distal end of the balloon 2; or the types of magnetic components are swapped at the corresponding positions; or, based on actual conditions, an action component 3 can be provided, and a magnetic component can be provided at the distal portion / end of the action component 3, etc., all of which constitute equivalent schemes of this embodiment.

[0065] Furthermore, the coil of the electromagnet 8 is preferably provided with a component for enhancing magnetism, such as an iron core.

[0066] Furthermore, as shown in FIG12 , in an electromagnetic-electromagnetic type solution, the two electromagnets 8 may be composed of different coils of the same circuit; of course, this is not limiting, and the electromagnets 8 may also be composed of coils of different circuits.

[0067] Furthermore, the balloon catheter is connected to an external power source, and the magnetic field strength of the electromagnet 8 is adjusted by controlling the presence and magnitude of current / voltage, thereby changing the force between the magnetic components.

[0068] For ease of understanding, a preferred embodiment is described below. Referring to Figures 12-13, when the balloon 2 needs to be retracted into the guide tube, the current of the external power supply is controlled so that the coil of the electromagnet 8 at the distal end of the balloon 2 and the coil of the electromagnet 8 in the distal portion 11 of the balloon body 1 are energized, generating a repulsive force. Simultaneously, the fluid in the balloon 2 is extracted by an external suction pump, allowing the working fluid in the balloon 2 to be smoothly extracted. Due to the repulsive force, the balloon 2 collapses and folds along its initial folded shape, so that the radial dimension of the balloon 2 after deflating is equal to or close to the radial dimension in the initial folded state, allowing it to be smoothly retracted into the guide tube and then transferred together with the guide tube to another treatment site and extended out of the guide tube again for treatment, or removed from the patient's organ or tissue along with the guide tube to complete the treatment.

[0069] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0070] In addition to the above, it should be noted that references to "one embodiment," "another embodiment," "an embodiment," and the like in this specification refer to specific features, structures, or characteristics described in conjunction with that embodiment as included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with any embodiment, it is intended that such feature, structure, or characteristic be implemented in conjunction with other embodiments and fall within the scope of this disclosure.

[0071] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0072] The foregoing description is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. A balloon catheter, comprising: A catheter body, a balloon, a connector, and an actuating member that define a proximal portion and a distal portion; The distal end of the actuating member is at least partially disposed within the catheter body, and the distal end of the actuating member is fixedly connected to the distal end of the balloon; the proximal portion of the catheter body is at least partially disposed within the connector, and the distal portion of the catheter body is connected to the proximal end of the balloon, characterized in that a connecting portion is provided between the proximal portion and the distal portion of the catheter body, and the distal portion of the catheter body is movable relative to the proximal portion of the catheter body.

2. The balloon catheter according to claim 1, wherein The distal end of the actuating member and the distal end of the balloon are independent of each other and can undergo an axial relative displacement, and the maximum value of the axial relative displacement is less than the maximum displacement value of the distal portion of the catheter body relative to the proximal portion of the catheter body in the axial direction.

3. A balloon catheter, comprising: A catheter body, a balloon, a connector, and an actuating member that define a proximal portion and a distal portion; The distal end of the actuating member is at least partially disposed within the catheter body; The proximal portion of the catheter body is at least partially disposed within the connector, and the distal portion of the catheter body is connected to the proximal end of the balloon, characterized in that a connecting portion is provided between the proximal portion of the catheter body and the connector, and the distal portion of the catheter body is movable relative to the connector.

4. The balloon catheter according to any one of claims 1 to 3, characterized in that, The connecting portion is at least one of a bellows structure, a telescopic sleeve joint provided with a stuffing box seal, a rubber tube, a silica gel tube, a telescopic nylon tube, a balloon, a fiber fabric telescopic joint or a combination thereof.

5. A balloon catheter, comprising: A catheter body, a balloon, and a connector that define a proximal portion and a distal portion, wherein the proximal portion of the catheter body is at least partially disposed within the connector; The distal portion of the catheter body is connected to the proximal end of the balloon, characterized in that magnetic members are respectively provided at the distal end of the balloon and the distal portion of the catheter body and the acting forces are mutually repulsive.

6. The balloon catheter according to claim 5, wherein An actuating member is further included, and a magnetic member is provided at the distal end of the actuating member to replace the magnetic member provided at the distal portion of the catheter body.

7. The balloon catheter according to claim 5 or 6, characterized in that, The magnetic member is at least one of a permanent magnet and an electromagnet or a combination thereof.

8. The balloon catheter according to claim 7, characterized in that, At least one of the magnetic members is an electromagnet; the magnetic force is controlled by controlling the current of the electromagnet.

9. The balloon catheter according to any one of claims 5-6 and 8, characterized in that, The magnetic members are all electromagnets, and the two electromagnets are formed by different coils of the same circuit or coils of different circuits.

10. A balloon catheter, comprising: A catheter body, a balloon, a connector, and an actuating member that define a proximal portion and a distal portion; The distal end of the actuating member is at least partially disposed within the catheter body, and the distal end of the actuating member is fixedly connected to the distal end of the balloon, and the proximal end of the actuating member is fixedly connected to the connector; characterized in that the proximal portion of the catheter body is at least partially disposed within the connector, and the distal portion of the catheter body is movable relative to the connector or the proximal portion of the catheter body.

11. The balloon catheter according to any one of claims 1-3, 5-6, and 10, characterized in that, The actuating member and the working fluid supply pipeline are the same component or different components.

12. The balloon catheter according to any one of claims 1-3, 5-6, and 10, characterized in that, A working fluid return pipeline and / or a vacuum layer is further provided.

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