A segmentable inflatable balloon dilatation catheter

Abstract

The application provides a segmentally inflatable balloon dilatation catheter, and belongs to the technical field of balloon dilatation catheters.The balloon dilatation catheter comprises a catheter body, an operating handle and a balloon body, the catheter body is used for leading into a target blood vessel, and the catheter body is internally provided with an axially extending inflation channel; the operating handle is arranged at the proximal end of the catheter body and is used for inflating and deflating the inflation channel with an inflation medium; the balloon body is arranged at a position of the catheter body which is located at a distance close to the distal end, the balloon body is internally provided with a plurality of inflation cavities arranged in the axial direction, the inflation channel is communicated with the inflation cavity at the distal end, and a partition assembly is arranged between any two adjacent inflation cavities, so as to ensure that the plurality of inflation cavities are sequentially inflated from the distal end to the proximal end in the process of inflating the balloon body; and the balloon dilatation catheter is mainly used for solving the technical problems that the overall synchronous inflation of the balloon dilatation catheter in the prior art is prone to slipping at a stenosis site of a blood vessel and is difficult to accurately dilate a stenosis region.

Description

Technical Field

[0001] This invention belongs to the field of balloon dilation catheter technology, specifically relating to a segmentally inflatable balloon dilation catheter. Background Technology

[0002] Balloon dilation catheters, as key medical devices in modern interventional therapy, are widely used in angioplasty for endovascular stenosis. These procedures primarily utilize minimally invasive puncture techniques to insert the catheter into the target blood vessel and position the balloon at the site of stenosis requiring treatment. During the procedure, medical staff inject a filling medium, such as liquid or gas, into the balloon. As the filling medium is introduced, the balloon gradually inflates, applying pressure to the surrounding blood vessel walls. This process, through physical dilation, reshapes the blood vessel, significantly improving blood flow patency and effectively alleviating tissue ischemia and other problems caused by vascular stenosis.

[0003] However, most existing balloon dilation catheters employ a single-filling-lumen design. This structure has limitations in practical applications: when the balloon begins to inflate, it expands synchronously throughout the entire vessel. At the site of vascular stenosis, irregular atherosclerotic plaques, thrombi, and other deposits often exist, which can exert reverse pressure on the inflating balloon. Especially in complex cases where the distal stenosis is significantly greater than the proximal stenosis, if a single-filling method is still used, the balloon is prone to slipping or bouncing towards the relatively looser proximal vessel area under pressure. This not only fails to ensure sufficient dilation of the stenotic site but also interferes with the precision of the procedure, directly affecting treatment outcomes and surgical safety.

[0004] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0005] The purpose of this invention is to provide a segmentally inflatable balloon dilation catheter to solve the technical problem in the prior art where the entire balloon dilation catheter is prone to slippage at the site of vascular stenosis and it is difficult to accurately dilate the stenotic area when it is inflated synchronously.

[0006] To achieve the above objectives, the segmentally inflatable balloon dilation catheter of the present invention provides the following technical solution:

[0007] A segmentally inflatable balloon dilation catheter, comprising:

[0008] The catheter body is used to insert into a target blood vessel, and the catheter body has an axially extending filling channel inside;

[0009] An operating handle is located at the proximal end of the catheter body and is used to fill the filling channel with filling medium.

[0010] The balloon body is positioned at a predetermined distance from the distal end of the catheter body. The balloon body has multiple filling chambers arranged axially inside. The filling channel communicates with the most distal filling chamber. A partition assembly is provided between any two adjacent filling chambers to ensure that the multiple filling chambers are sequentially filled from the distal end to the proximal end during the inflation of the balloon body.

[0011] As a further optimized technical solution, the partition assembly includes a first partition unit and a second partition unit arranged adjacent to each other. The first partition unit is located in the filling chamber facing the far end. The first partition unit has a first deformation joint arranged through both sides. The second partition unit has a second deformation joint arranged through both sides. The first deformation joint and the second deformation joint are arranged opposite to each other.

[0012] In the initial stage of filling, the first and second expansion joints do not deform or deform only slightly to ensure that the filling chamber near the far end is filled quickly. In the later stage of filling, under the pressure of the filling medium, the first and second expansion joints expand and deform to allow a large amount of filling medium to pass through and fill the adjacent near-end filling chamber.

[0013] As a further optimized technical solution, the first partition unit includes multiple circumferentially arranged partition pieces. The side of each partition piece away from the catheter body is fixedly connected to the inner wall of the balloon body, and the gap between any two adjacent partition pieces constitutes the first deformation joint.

[0014] As a further optimized technical solution, the second partition unit includes an integrally arranged circular diaphragm, which is sleeved on the catheter body and is circumferentially fixedly connected to the inner wall of the balloon body. Multiple second deformation slits are arranged circumferentially around the center of the circular diaphragm.

[0015] As a further optimized technical solution, both the first deformation joint and the second deformation joint are straight lines.

[0016] As a further optimized technical solution, the baffle assembly is also equipped with a pressure relief component for depressurizing the balloon body.

[0017] As a further optimized technical solution, the pressure relief component is a return hole that runs through a circular diaphragm, and the return hole is located at a position that can be completely covered by the baffle plate.

[0018] As a further optimized technical solution, the reflux hole between any two adjacent second deformation joints is arranged in the middle position between the two second deformation joints.

[0019] As a further optimized technical solution, the catheter body has a protective layer, a support layer and a guide layer arranged sequentially from the outside to the inside. The guide layer has a lumen extending along the axial direction inside, and the filling channel is arranged on one side of the lumen.

[0020] As a further optimized technical solution, the cross-section of the filling channel is an arc shape arranged around the cavity.

[0021] Beneficial effects: First, the balloon dilation catheter of the present invention, by setting multiple filling chambers and septum components, can achieve segmented inflation of the balloon from distal to proximal. During inflation, the filling medium first enters the most distal filling chamber, causing it to expand preferentially. When dealing with vessels with high distal stenosis and relatively loose proximal sections, the expanded distal filling chamber will tightly adhere to the stenosis, forming a stable support point. Compared to the overall inflation of the balloon in existing technologies, the localized inflation of the present invention has a smaller contact area with the vessel wall, which reduces the impact on vessel wall shape. By applying concentrated pressure, compared to a fully inflated balloon resulting in a larger contact area, the localized expansion of this invention allows for greater pressure on the blood vessel wall at the inflation point, making it easier to position the balloon and reducing the likelihood of slippage or jumping. Furthermore, as inflation progresses, the proximal inflation chambers are filled sequentially, gradually expanding proximally. This gradient expansion from distal to proximal ensures that the balloon's force on the blood vessel is gradual and orderly, avoiding the large impact force caused by sudden overall expansion that could lead to proximal slippage or jumping of the balloon.

[0022] Furthermore, the baffle components positioned between any two adjacent filling chambers ensure that the filling chambers are filled sequentially from distal to proximal. During the initial filling phase, the baffle components restrict the flow of the filling medium, allowing it to accumulate rapidly in the distal filling chamber. Only when the pressure in the distal chamber reaches a certain level will the baffle components change, allowing the medium to flow into the proximal filling chamber. This directional control of the filling sequence ensures that the balloon expansion has a clear directionality, always starting from the distal stenosis and gradually expanding proximally. This guarantees that the balloon remains in contact with the treated blood vessel during expansion, preventing slippage due to disordered filling, thus improving the success rate and treatment outcome.

[0023] Furthermore, the double deformation suture structure in the baffle assembly of this invention enables intelligent regulation of the balloon inflation process. In the initial stage of inflation, the first and second deformation sutures are in a closed or slightly open state, strictly limiting the flow direction of the inflation medium and ensuring that the distal inflation chamber is rapidly and fully inflated. This allows the balloon to act on the critical narrowing site in the shortest possible time, seizing the golden opportunity for surgery. When the pressure in the distal chamber reaches the threshold, the pressure exerted by the inflation medium on the deformation sutures causes them to expand, allowing the medium to flow smoothly into the proximal chamber, achieving orderly inflation of the entire balloon. This adaptive inflation mechanism allows doctors to control the surgical process more easily and efficiently without frequently adjusting the intensity and rhythm of the operation, reducing surgical time and operational complexity, and improving surgical safety and smoothness.

[0024] Furthermore, after the procedure, when it is necessary to depressurize the balloon to withdraw the catheter, the reflux orifice provides a rapid return channel for the filling medium. When the filling medium is aspirated through the operating handle, the medium in the filling chamber flows to the distal filling chamber, which in turn pushes the septum to deform distally to remove the cover from the reflux orifice. At this time, the filling medium can quickly flow back to the filling channel through the reflux orifice, allowing the surgeon to withdraw the balloon dilation catheter from the blood vessel more quickly, reducing the patient's operation time, lowering the surgical risk, and improving the overall surgical efficiency. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0026] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention;

[0027] Figure 2 for Figure 1 A cross-sectional view of the central catheter body along the AA direction;

[0028] Figure 3 This is a schematic diagram of the structure of a balloon body according to an embodiment of the present invention;

[0029] Figure 4 for Figure 2 Cross-sectional view of the central balloon duct along the BB direction;

[0030] Figure 5 This is a schematic diagram of the overall structure of the first partition unit according to an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the overall structure of the second partition unit according to an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the filling state of the distal filling chamber according to an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the state of the baffle assembly during the decompression process of the balloon body according to an embodiment of the present invention.

[0034] In the figure: 100, catheter body; 101, protective layer; 102, support layer; 103, guide layer; 110, filling channel; 120, lumen; 130, filling orifice; 140, tip structure; 200, operating handle; 300, balloon body; 310, filling chamber; 400, baffle assembly; 410, first baffle unit; 411, first expansion joint; 420, second baffle unit; 421, second expansion joint; 422, reflux orifice. Detailed Implementation

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0036] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. Furthermore, the term "proximal end" uniformly refers to the end closer to the operator, while "distal end" refers to the end farther from the operator.

[0037] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0038] The shapes and sizes of the components in the accompanying drawings do not reflect the actual proportions of the product; they are only intended to illustrate the content of the invention.

[0039] This invention provides a segmentally inflatable balloon dilatation catheter. The catheter body 100 of the balloon dilatation catheter has an inflation channel 110 for inflating and deflating a balloon body 300. An operating handle 200 is located at the proximal end of the catheter body 100 to facilitate the inflation and deflation of the inflation medium. The balloon body 300 is located at the distal end of the catheter body 100 and has multiple axially arranged inflation chambers 310 inside. The inflation channel 110 communicates with the distal inflation chamber 310. A partition assembly 400 between any two adjacent inflation chambers 310 ensures that the inflation chambers 310 are inflated sequentially from the distal end to the proximal end. The partition assembly 400 includes a first and a second partition unit, with a first and a second deformation joint respectively, to achieve rapid filling of the distal filling chamber 310 in the initial stage of filling, and sequential filling of the proximal filling chamber 310 in the later stage. This invention reduces intraoperative slippage or jumping by segmenting the balloon body 300, accurately expands the stenotic area of ​​the blood vessel, effectively improves the success rate and safety of the operation, and has good clinical application value.

[0040] Example 1

[0041] like Figure 1 As shown, the segmentally inflatable balloon dilation catheter in this embodiment includes a catheter body 100, an operating handle 200, and a balloon body 300.

[0042] The catheter body 100 is used to insert into the target blood vessel, such as Figure 2 As shown, the catheter body 100 has a protective layer 101, a support layer 102, and a guide layer 103 arranged sequentially from the outside to the inside. The outermost protective layer 101 is made of a polymer material through extrusion molding, wherein the polymer material can be polyamide (PA), polyetheramide copolymer (Pebax), or polyurethane (PU). The middle support layer 102 is a braided metal (such as stainless steel) wire structure, which can provide sufficient support to prevent the catheter body 100 from bending in the blood vessel and increase the pushability and shape retention of the catheter body 100. The innermost guide layer 103 is made of polytetrafluoroethylene (PTFE) material with a low coefficient of friction, which facilitates the sliding of the catheter body 100 in the blood vessel. The guide layer 103 has an axially extending lumen 120 for the guide wire to pass through, and an axially extending filling channel 110 is arranged on one side of the lumen 120.

[0043] The operating handle 200 is located at the proximal end of the catheter body 100 as a handheld component, ensuring that the physician can hold it stably during the procedure and precisely adjust the state of the catheter body 100 as it moves along the blood vessel through rotation, pushing, and pulling movements. Simultaneously, the operating handle 200 has a connector for connecting to the filling channel 110, facilitating the connection of an external filling medium filling device (such as a syringe) to fill the filling channel 110 with filling medium.

[0044] The balloon body 300 is positioned at a predetermined distance from the distal end of the catheter body 100. Specifically, the distal end of the catheter body 100 forms a tip structure 140, which is conical in shape and has a specially lubricated surface. This effectively reduces the resistance of the catheter body 100 during its movement within the blood vessel, allowing the catheter body 1000 to smoothly pass through the tortuous blood vessel along the guidewire and accurately reach the lesion site. The balloon body 300 is positioned proximal to the tip structure 140. The outer capsule of the balloon body 300 is blow-molded from a polymer material such as polyether amide copolymer (Pebax), polyamide (PA), or polyethylene terephthalate (PET). Internally, it has multiple filling chambers 310 arranged axially. The filling channel 110 communicates with the distal filling chamber 310. Specifically, the catheter body 100 has an filling hole 130 on the side wall of the distal filling chamber 310, communicating with the filling channel 110. A partition assembly 400 is provided between any two adjacent filling chambers 310 to ensure that the filling chambers 310 are sequentially filled from distal to proximal during the inflation of the balloon body 300.

[0045] In this embodiment, two filling chambers 310 are provided, specifically as follows: Figure 3 , Figure 4 As shown, the baffle assembly 400 is disposed between the distal filling chamber 310 and the proximal filling chamber 310.

[0046] The baffle assembly 400 includes a first baffle unit 410 and a second baffle unit 420 arranged adjacent to each other. The first baffle unit 410 is located at the filling chamber 310 facing the distal end. The first baffle unit 410 has a first deformation joint 411 arranged through both sides. The second baffle unit 420 has a second deformation joint 421 arranged through both sides. The first deformation joint 411 and the second deformation joint 421 are arranged opposite to each other. In the initial stage of filling, the first deformation joint 411 and the second deformation joint 421 do not deform or deform only slightly to ensure that the filling chamber 310 near the distal end is filled quickly. In the later stage of filling, under the pressure of the filling medium, the first deformation joint 411 and the second deformation joint 421 expand and deform to allow a large amount of filling medium to pass through and fill the adjacent proximal filling chamber 310.

[0047] In this embodiment, as Figure 5As shown, the first partition unit 410 includes four circumferentially arranged arc-shaped partitions, which together form a partition structure circumferentially arranged around the catheter body 100. Each partition is fixedly connected to the inner wall of the balloon body 300 on the side furthest from the catheter body 100, and the gap between any two adjacent partitions constitutes the aforementioned first deformation joint 411. The second partition unit 420 includes an integrally arranged circular diaphragm, which is fitted onto the catheter body 100 and circumferentially fixedly connected to the inner wall of the balloon body 300. Four second deformation joints 421 are evenly arranged circumferentially around the center of the circular diaphragm.

[0048] Furthermore, both the first expansion joint 411 and the second expansion joint 421 are straight lines. Compared to expansion joints with complex shapes, the straight shapes of the first expansion joint 411 and the second expansion joint 421 are easier to manufacture, whether using mold forming, laser cutting, or other processing techniques. This results in lower production difficulty and effectively reduces processing costs and production cycles. Simultaneously, the simple and regular shape also facilitates better quality control during production, reducing product defects caused by irregular shapes and increasing product yield. In addition, the straight shape of the expansion joint exhibits more regular deformation direction and degree under stress, making it easier to control precisely. In the initial stage of inflation, the straight slit has a small opening, which effectively restricts the flow of the inflation medium to the proximal inflation chamber 310, ensuring that the distal inflation chamber 310 is preferentially and rapidly inflated. When the pressure in the distal inflation chamber 310 increases to a certain extent, the straight deformation slit expands uniformly along its own length, allowing the inflation medium to flow stably to the proximal inflation chamber 310, ensuring the stability and consistency of the segmented inflation process of each inflation chamber 310 of the balloon body 300, and making it easier for the doctor to control the rhythm of the operation.

[0049] Furthermore, the baffle assembly 400 is also equipped with a pressure relief component for depressurizing the balloon body 300. For example... Figure 6As shown, the pressure relief component is a reflux hole 422 that runs through the circular diaphragm, positioned where it can be completely covered by the baffle plate. In this way, during the inflation of the balloon 300, the baffle plate of the first baffle unit 410 deforms towards the proximal inflation chamber 310, thus compressing and covering the reflux hole 422. This prevents premature leakage or diversion of the inflation medium from the reflux hole 422, ensuring that the inflation medium follows a predetermined path, preferentially inflating the distal inflation chamber 310 quickly. Then, under pressure, the proximal inflation chamber 310 is inflated systematically through the deformation joint of the baffle assembly 400, maintaining the normal order of segmented inflation of the balloon 300. This ensures that the balloon 300 expands gradually from distal to proximal as expected, achieving precise treatment. During the decompression phase of the balloon body 300, the pressure in the distal filling chamber 310 decreases first. At this time, the pressure in the proximal filling chamber 310 pushes the baffle plate in the distal direction, causing the baffle plate to deform and open in the distal direction. The filling medium enters the distal filling chamber 310 through the four return holes 422 of the second baffle unit 420.

[0050] Furthermore, the reflux hole 422 between any two adjacent second deformation joints 421 is positioned at the midpoint between the two second deformation joints 421. This ensures that during the inflation of the balloon body 300, the baffle plate can more fully cover and seal the reflux hole 422. In addition, this regular layout facilitates mold design, processing technology implementation, and quality inspection during the manufacturing process of the balloon dilation catheter. During production, the position and size of the reflux hole 422 can be more precisely controlled, reducing the product defect rate due to positional deviations. In the quality inspection stage, it is also easier to establish unified inspection standards and quickly determine whether the product meets design requirements, thereby improving production efficiency and reducing production costs.

[0051] Furthermore, the cross-section of the filling channel 110 is an arc shape arranged around the lumen 120. This design ensures that the lumen 120 can accommodate the guide wire while efficiently utilizing space to set up a filling channel 110 with a larger cross-sectional area. It avoids excessively increasing the outer diameter of the catheter body 100 to set up two relatively independent filling channels 110 and the lumen 120. While ensuring functional integrity, it maintains the slender shape of the catheter body 100, reduces the difficulty of vascular puncture and the risk of damage to blood vessels, and is especially suitable for treatment scenarios with small blood vessel diameters.

[0052] In addition, balloon dilation catheters are generally divided into quick-exchange (RX) and integral-exchange (OTW) types. The balloon body 300 is usually located at the distal end of the catheter body 100, and the balloon body is generally made of polymer tubing such as nylon or polyamide through drawing and blow molding. RX balloon catheters are equipped with a quick-exchange port, allowing them to be used in conjunction with guidewires and other devices. Gas or liquid filling media enter the catheter body 100 through the proximal end and eventually reach the balloon body 300 to inflate it. Integral-exchange balloon catheters do not have a quick-exchange port; the proximal end of the catheter body 100 is connected to the operating handle 200. Gas or liquid filling media enter the catheter body 100 through the operating handle 200 and eventually reach the balloon body 300 to inflate it.

[0053] Based on the pathogenesis of vascular stenosis and restenosis, and considering the dilation effect of the balloon 300, drugs such as paclitaxel and rapamycin, which can treat vascular stenosis and inhibit restenosis, can be sprayed onto the surface of the balloon 300. Alternatively, depending on the actual purpose of the balloon 300, appropriate therapeutic drugs can be sprayed onto its surface. This allows the drugs to be released onto the blood vessel wall in contact with the balloon 300 during dilation, achieving the corresponding therapeutic purpose. In this embodiment, an integral exchange-wound (OTW) balloon dilation catheter is selected.

[0054] Specifically, during the procedure to dilate a narrowed blood vessel, the surgeon first inserts a balloon dilation catheter into the blood vessel through the puncture site, and then, guided by a guide wire, guides the balloon body 300 to the narrowed area. Subsequently, the filling medium is injected into the filling channel 110 via a filling medium dispensing device connected to the handle 200. Because the first deformation slit 411 and the second deformation slit 421 do not deform or deform only slightly during the initial filling stage, the filling medium preferentially enters the distal filling chamber 310 through the filling orifice 130, rapidly inflating the chamber. Figure 4 As shown, at this time, the medium in the distal filling chamber 310 will push the first septum unit 410 and the second septum unit 420 to adhere together and deform towards the proximal end. The distal end of the balloon body 300 initially expands, initially dilating the stenotic portion of the distal blood vessel, such as... Figure 7 As shown, as the filling medium is continuously injected, the pressure in the distal filling chamber 310 gradually increases. When the pressure reaches a certain level, the first deformation joint 411 and the second deformation joint 421 begin to expand and deform. The filling medium passes through the partition assembly 400 and enters the adjacent proximal filling chamber 310, thus completing the filling of each filling chamber 310 of the balloon body 300 in sequence, achieving gradual and precise expansion of the stenotic part of the blood vessel.

[0055] When the balloon 300 needs to be depressurized after the surgery, the inflation medium is aspirated externally through the inflation / deflation device at the operating handle 200. The medium in the inflation chamber 310 then flows towards the distal inflation chamber 310, thereby pushing the septum to deform distally and release its cover over the return orifice 422. Figure 8 As shown, at this time, the filling medium can quickly flow back to the filling channel 110 through the reflux hole 422, allowing the doctor to withdraw the balloon dilation catheter from the blood vessel more quickly, reducing the patient's operation time, reducing the operation risk, and improving the overall operation efficiency.

[0056] In summary, the segmentally inflatable balloon dilatation catheter provided by this invention allows for sequential inflation of the distal end of the balloon body 300 before it is fully inflated and fixed to the blood vessel. This avoids slippage or jumping of the catheter body 100 during inflation, thus eliminating the limitations of inaccurate positioning in existing balloon dilatation catheters, achieving precise dilatation and reducing vascular damage. This leads to more ideal therapeutic effects and effectively avoids various abnormal symptoms caused by balloon jumping, reducing the risks during clinical procedures and demonstrating promising clinical application prospects.

[0057] It is understood that the above description is merely exemplary and the embodiments of this application do not limit the scope of the application.

[0058] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention shall be within the scope of protection of the pending claims of the present invention.

Claims

1. A segmentally inflatable balloon dilation catheter, characterized in that, include: The catheter body (100) is used to insert into a target blood vessel, and the catheter body (100) has an axially extending filling channel (110) inside. An operating handle (200) is located at the proximal end of the catheter body (100) and is used to fill the filling channel (110) with filling medium. A balloon body (300) is positioned at a predetermined distance from the distal end of the catheter body (100). The balloon body (300) has multiple filling chambers (310) arranged axially inside. The filling channel (110) communicates with the most distal filling chamber (310). A partition assembly (400) is provided between any two adjacent filling chambers (310) to ensure that during the inflation of the balloon body (300), the multiple filling chambers (310) are sequentially inflated from the distal end to the proximal end. The partition assembly (400) includes a first partition unit (410) and a second partition unit (420) arranged adjacent to each other. The first partition unit (410) is located in the filling chamber (310) facing the distal end. The first partition unit (410) has a first expansion joint (411) arranged through both sides. The second partition unit (420) has a second expansion joint (421) arranged through both sides. The first expansion joint (411) and the second expansion joint (421) are arranged opposite to each other. In the initial stage of filling, the first deformation joint (411) and the second deformation joint (421) do not deform or deform only slightly, so as to ensure that the filling chamber (310) near the far end is filled quickly. In the later stage of filling, under the pressure of the filling medium, the first deformation joint (411) and the second deformation joint (421) expand and deform, so that the filling medium passes through in large quantities and fills the adjacent near-end filling chamber (310). The baffle assembly (400) is also provided with a pressure relief component for depressurizing the balloon body (300); The pressure relief component is a return hole (422) that penetrates the second partition unit (420), and the return hole (422) is located in a position that can be completely covered by the first partition unit (410); The first baffle unit (410) includes multiple circumferentially arranged baffles. During the inflation of the balloon body (300), the baffles of the first baffle unit (410) deform towards the proximal inflation chamber (310), pressing and covering the reflux hole (422) to prevent the inflation medium from leaking or diverting prematurely from the reflux hole (422). During the depressurization stage of the balloon body (300), the pressure in the distal inflation chamber (310) decreases first, and the pressure in the proximal inflation chamber (310) pushes the baffles towards the distal direction, causing the baffles to deform and open towards the distal direction. The inflation medium enters the distal inflation chamber (310) through the four reflux holes (422) of the second baffle unit (420).

2. The segmentally inflatable balloon dilation catheter according to claim 1, characterized in that, Each of the septa is fixedly connected to the inner wall of the balloon body (300) on the side away from the catheter body (100), and the gap between any two adjacent septa constitutes the first deformation joint (411).

3. The segmentally inflatable balloon dilation catheter according to claim 2, characterized in that, The second partition unit (420) includes an integrally arranged circular diaphragm, which is sleeved on the catheter body (100). The circular diaphragm is circumferentially fixedly connected to the inner wall of the balloon body (300), and a plurality of second deformation seams (421) are circumferentially spaced around the center of the circular diaphragm.

4. The segmentally inflatable balloon dilation catheter according to claim 1, characterized in that, Both the first expansion joint (411) and the second expansion joint (421) are straight lines.

5. The segmentally inflatable balloon dilation catheter according to claim 1, characterized in that, The return hole (422) between any two adjacent second expansion joints (421) is arranged at the middle position between the two second expansion joints (421).

6. The segmentally inflatable balloon dilation catheter according to any one of claims 1-5, characterized in that, The catheter body (100) has a protective layer (101), a support layer (102) and a guide layer (103) arranged sequentially from the outside to the inside. The guide layer (103) has a lumen (120) extending axially inside, and the filling channel (110) is arranged on one side of the lumen (120).

7. The segmentally inflatable balloon dilation catheter according to claim 6, characterized in that, The cross-section of the filling channel (110) is an arc shape arranged around the cavity (120).

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