Balloon dilatation catheter capable of being filled in segmented mode

Abstract

The invention provides a balloon dilatation catheter capable of being filled in a segmented mode, 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 being guided into a target blood vessel, and a filling channel extending in the axial direction is formed in the catheter body; the operating handle is arranged at the near end of the catheter body and is used for filling and discharging the filling medium into the filling channel; the balloon body is arranged at the position, close to the far end by a set distance, of the catheter body, a plurality of filling cavities are formed in the balloon body in the axial direction, a filling channel is communicated with the filling cavity at the farthest end, and a partition assembly is arranged between any two adjacent filling cavities and used for ensuring that the filling cavities are communicated with the filling cavity at the farthest end in the balloon body filling process. The plurality of filling chambers are sequentially filled from the far end to the near end; the balloon dilatation catheter is mainly used for solving the technical problems that in the prior art, a balloon dilatation catheter is integrally and synchronously filled and easily slips at a narrow blood vessel part, and a narrow area is difficult to accurately dilate.

Description

Technical Field

[0001] The invention belongs to the technical field of balloon dilatation catheters, and in particular relates to a balloon dilatation catheter that can be filled in sections. Background Art

[0002] As a key medical device in modern interventional therapy, balloon dilatation catheters are widely used in dilatation and angioplasty procedures for vascular stenosis. This procedure primarily uses minimally invasive puncture techniques to guide the catheter into the target vessel and place the balloon at the site of vascular stenosis requiring treatment. During the procedure, medical personnel inject a filling medium, such as liquid or gas, into the balloon. As the filling medium is introduced, the balloon gradually expands, exerting pressure on the surrounding vessel walls. This process reshapes the vessel through physical expansion, significantly improving blood flow and effectively alleviating problems such as tissue ischemia caused by vascular stenosis.

[0003] However, most existing balloon dilatation catheters use a single filling cavity design. This structure has limitations in practical applications: when the balloon begins to fill, it will show an overall synchronous expansion form. In the area of ​​vascular stenosis, there are often irregular atherosclerotic plaques, thrombi and other sedimentary tissues, which will exert reverse pressure on the filling balloon. Especially in complex cases where the degree of distal stenosis is significantly higher than that of the proximal end, if the overall filling method is still used, the balloon is prone to slip or jump towards the relatively loose blood vessel area at the proximal end under the action of pressure. This situation not only fails to ensure that the stenosis area is fully expanded, but also interferes with the precise operation of the operation, directly affecting the treatment effect and surgical safety.

[0004] Therefore, it is necessary to provide an improved technical solution to the above-mentioned deficiencies in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a segmentally inflatable balloon dilatation catheter to solve the technical problem in the prior art that the balloon dilatation catheter is easily slipped at the stenosis site during the overall synchronous filling and is difficult to accurately dilate the stenosis area.

[0006] In order to achieve the above-mentioned objectives, the segmentally inflatable balloon dilatation catheter of the present invention provides the following technical solutions:

[0007] A segmentally inflatable balloon dilatation catheter comprising:

[0008] a catheter body, the catheter body being used for introduction into a target blood vessel, the catheter body having an axially extending filling channel therein;

[0009] an operating handle, the operating handle being disposed at the proximal end of the catheter body and being used to fill or release a filling medium into the filling channel;

[0010] The balloon body is arranged at a position close to the distal end of the catheter body at a set distance. The balloon body has multiple filling chambers arranged axially inside, and the filling channel is connected to the filling chamber at the farthest end. A barrier component is provided between any two adjacent filling chambers to ensure that during the filling process of the balloon body, the multiple filling chambers are filled in sequence from the distal end to the proximal end.

[0011] As a further optimized technical solution, the barrier assembly includes a first barrier unit and a second barrier unit arranged adjacent to each other, the first barrier unit being arranged at a position toward the distal filling chamber, the first barrier unit having a first deformation slit arranged through both sides, the second barrier unit having a second deformation slit arranged through both sides, the first deformation slit and the second deformation slit being arranged opposite to each other;

[0012] In the early stage of filling, the first deformation joint and the second deformation joint do not deform or deform only slightly to ensure that the filling chamber near the distal end is quickly filled. In the later stage of filling, under the pressure of the filling medium, the first deformation joint and the second deformation joint expand and deform to allow the filling medium to pass through in large quantities and fill the adjacent proximal filling chamber.

[0013] As a further optimized technical solution, the first barrier unit includes a plurality of circumferentially arranged barrier sheets, each of which is fixedly connected to the inner wall of the balloon body on a side away from the catheter body, and the gap between any two adjacent barrier sheets constitutes the first deformation seam.

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

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

[0016] As a further optimized technical solution, a pressure relief component for relieving pressure from the balloon body is further arranged on the barrier assembly.

[0017] As a further optimized technical solution, the pressure relief component is a reflux hole provided through the circular diaphragm, and the reflux hole is provided at a position that can be completely covered by the barrier sheet.

[0018] As a further optimized technical solution, the reflow 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 in sequence from the outside to the inside, the guide layer has a lumen extending axially 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 arranged around the lumen.

[0021] Beneficial effects: First, the balloon dilatation catheter of the present invention can realize segmented filling of the balloon from the distal end to the proximal end by setting multiple filling chambers and barrier components. In this way, during the filling process, the filling medium will first enter the filling chamber at the distal end, so that it will expand first. When facing a blood vessel with a high degree of stenosis at the distal end and a relatively loose proximal end, the distal filling chamber will fit tightly to the stenosis after expansion, forming a stable support point. Compared with the overall filling of the balloon body in the prior art, the local filling of the present invention has a smaller contact area with the blood vessel wall, which will affect the shape of the blood vessel wall. Compared with the situation where the overall filled balloon has a larger contact area, the local expansion of the present invention makes the pressure on the blood vessel wall at the filled position greater, thereby making it easier to position the balloon and making it less likely to slip or jump. As the filling progresses, the proximal filling chamber is filled in turn, gradually expanding toward the proximal end. This gradient expansion method from the distal end to the proximal end makes the force exerted by the balloon on the blood vessel gradual and orderly, avoiding the large impact force generated by the sudden overall expansion that causes the balloon to slip or jump toward the proximal end.

[0022] Furthermore, the barrier assembly installed between any two adjacent filling chambers ensures that the filling chambers are filled sequentially from distal to proximal. The barrier assembly restricts the flow of the filling medium during the initial filling phase, allowing the medium to rapidly accumulate in the distal filling chamber. Only when the distal chamber pressure reaches a certain level will the barrier assembly be activated, allowing the medium to flow to the proximal filling chamber. This directionally controlled filling sequence ensures that the balloon expands in a clear direction, always starting from the distal stenosis and gradually expanding proximally. This ensures that the balloon remains in contact with the vessel in need of treatment during expansion, preventing slippage due to disordered filling and improving the success rate of the procedure and the therapeutic effect.

[0023] Furthermore, the double deformation seam structure in the barrier assembly of the present invention gives the balloon filling process an intelligent control feature. In the initial filling stage, the first deformation seam and the second deformation seam are in a closed or slightly open state, strictly limiting the flow direction of the filling medium, ensuring that the distal filling chamber is quickly and fully filled, so that the balloon can act on the key narrow part in the shortest time, seizing the golden opportunity for surgery. When the pressure in the distal chamber reaches the threshold, the pressure generated by the filling medium on the deformation seam causes it to expand, and the medium is able to flow smoothly into the proximal chamber, realizing the overall orderly expansion of the balloon. This adaptive filling mechanism eliminates the need for doctors to frequently adjust the operating force and rhythm, and can more easily and efficiently control the surgical process, reduce surgical time and operational complexity, and improve surgical safety and smoothness.

[0024] Furthermore, after the operation is completed, when the balloon body needs to be depressurized in order to withdraw the catheter, the setting of the reflux hole provides a rapid reflux channel for the filling medium. When the filling medium is withdrawn through the operating handle, the filling medium is sucked to the outside through the position of the operating handle. The medium in the filling chamber now flows toward the filling chamber at the distal end, thereby pushing the baffle to deform in the distal direction to release the coverage of the reflux hole. At this time, the filling medium can quickly flow back to the filling channel through the reflux hole, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings and the accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. Among them:

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

[0027] Figure 2 for Figure 1 A schematic cross-sectional view of the middle conduit body along the AA direction;

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

[0029] Figure 4 for Figure 2 Schematic cross-sectional view of the middle balloon tube along the BB direction;

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

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

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

[0033] Figure 8 This is a schematic diagram of the state of the barrier assembly during the pressure relief process of the balloon according to one 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 hole; 140, tip structure; 200, operating handle; 300, balloon body; 310, filling chamber; 400, barrier assembly; 410, first barrier unit; 411, first deformation joint; 420, second barrier unit; 421, second deformation joint; 422, reflux hole. DETAILED DESCRIPTION

[0035] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0036] In the description of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through an intermediate component. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. In addition, the term "proximal end" refers to the end close to the operator, and "distal end" refers to the end away from the operator.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0038] The shapes and sizes of the components in the drawings do not reflect the actual proportions of the products, and are only intended to illustrate the contents of the present invention.

[0039] The present invention provides a balloon dilatation catheter that can be filled in segments. The catheter body 100 of the balloon dilatation catheter is provided with a filling channel 110 for filling and releasing a balloon body 300. The operating handle 200 is located at the proximal end of the catheter body 100 to facilitate the operation of filling and releasing the filling medium. The balloon body 300 is arranged at the distal end of the catheter body 100 and has multiple axially arranged filling chambers 310 inside. The filling channel 110 is connected to the farthest filling chamber 310. The barrier assembly 400 between any two adjacent filling chambers 310 ensures that the filling chambers 310 are filled sequentially from the distal end to the proximal end. The barrier assembly 400 includes first and second barrier units, which are respectively provided with first and second deformation seams, so as to realize rapid filling of the distal filling chamber 310 in the initial filling stage and sequential filling of the proximal filling chamber 310 in the later stage. The present invention reduces intraoperative slippage or pulsation through segmented filling of 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 dilatation 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 be introduced into a 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 in sequence 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 selected from polyamide (PA) or 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 force to prevent the catheter body 100 from bending in the blood vessel and increase the pushability and shape retention ability of the catheter body 100. The innermost guide layer 103 is made of polytetrafluoroethylene (PTFE) material with a low friction coefficient to facilitate the sliding of the catheter body 100 in the blood vessel. The guide layer 103 has an axially extending lumen 120 inside 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, located at the proximal end of the catheter body 100, serves as a handheld component, ensuring a stable grip during surgery. It allows the physician to precisely adjust the catheter body 100's position along the blood vessel through rotation, pushing, and pulling. The operating handle 200 also features a connector for connecting to the filling channel 110, facilitating connection to an external device (such as a syringe) for filling or discharging the filling medium.

[0044] The balloon 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 conical tip structure 140, which has a specially lubricated surface. This effectively reduces the resistance of the catheter body 100 as it travels within the blood vessel, allowing the catheter body 100 to smoothly traverse tortuous blood vessels along a guidewire and precisely reach the lesion site. The balloon 300 is positioned proximal to the tip structure 140. The outer shell of the balloon 300 is blow-molded from a polymer material such as polyetheramide copolymer (Pebax), polyamide (PA), or polyethylene terephthalate (PET). It contains multiple axially arranged filling chambers 310. A filling channel 110 communicates with the distal-most filling chamber 310. Specifically, a filling hole 130 is formed on the sidewall of the distal-most filling chamber 310 of the catheter body 100, connecting to the filling channel 110. The filling chambers 310 communicate with the filling channel 110 through the filling hole 130. A barrier assembly 400 is positioned between any two adjacent filling chambers 310 to ensure that the filling chambers 310 are filled sequentially from the distal end to the proximal end during balloon 300 inflation.

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

[0046] The barrier assembly 400 includes a first barrier unit 410 and a second barrier unit 420 arranged adjacent to each other. The first barrier unit 410 is arranged at a position toward the distal filling chamber 310. The first barrier unit 410 has a first deformation slit 411 arranged through both sides, and the second barrier unit 420 has a second deformation slit 421 arranged through both sides. The first deformation slit 411 and the second deformation slit 421 are arranged opposite to each other. In the early stage of filling, the first deformation slit 411 and the second deformation slit 421 do not deform or deform very little to ensure that the filling chamber 310 near the distal end is quickly filled. In the later stage of filling, under the pressure of the filling medium, the first deformation slit 411 and the second deformation slit 421 expand and deform so that a large amount of filling medium passes through and fills the adjacent proximal filling chamber 310.

[0047] In this embodiment, if Figure 5As shown, the first barrier unit 410 comprises four circumferentially arranged arcuate barrier pieces. These four arcuate barrier pieces of equal size form a barrier structure circumferentially arranged around the catheter body 100. Each barrier piece is fixedly connected to the inner wall of the balloon body 300 on the side facing away from the catheter body 100, and the gap between any two adjacent barrier pieces constitutes the aforementioned first deformation seam 411. The second barrier unit 420 comprises an integrally arranged circular diaphragm that is sheathed over the catheter body 100 and circumferentially fixedly connected to the inner wall of the balloon body 300. Four second deformation seams 421 are evenly arranged circumferentially around the center of the circular diaphragm.

[0048] Furthermore, both the first and second deformation joints 411 and 421 are linear in shape. Compared to complex-shaped deformation joints, linear deformation joints 411 and 421 are easier to manufacture, whether using mold forming, laser cutting, or other processing techniques. This reduces production complexity and effectively reduces processing costs and production cycles. Furthermore, simple, regular shapes also facilitate improved quality control during production, reducing product defects caused by irregular shapes and increasing product yield. Furthermore, when subjected to stress, linear deformation joints exhibit more regular deformation direction and degree, facilitating precise control. In the initial stage of filling, the linear gap has a small opening in its initial state, which can effectively limit the flow of filling medium to the proximal filling chamber 310, ensuring that the distal filling chamber 310 is filled quickly and preferentially; when the pressure of the distal filling chamber 310 increases to a certain level, the linear deformation seam expands evenly along its own length, allowing the filling medium to flow stably to the proximal filling chamber 310, ensuring the stability and consistency of the segmented filling process of each filling chamber 310 of the balloon body 300, making it easier for doctors to control the rhythm of the operation.

[0049] Furthermore, a pressure relief component for relieving pressure of the balloon body 300 is also arranged on the barrier assembly 400. Figure 6As shown, the pressure relief component is a reflux hole 422 provided through the circular diaphragm, and the reflux hole 422 is located in a position that can be completely covered by the barrier sheet. Thus, during the inflation process of the balloon 300, the barrier sheet of the first barrier unit 410 deforms toward the proximal filling chamber 310, thereby compressing and covering the reflux hole 422, preventing premature leakage or diversion of the filling medium from the reflux hole 422. This ensures that the filling medium follows a predetermined path, preferentially filling the distal filling chamber 310 quickly. Subsequently, under the action of pressure, the proximal filling chamber 310 is filled in an orderly manner through the deformation seam of the barrier assembly 400, maintaining the normal order of the segmented inflation of the balloon 300 and ensuring that the balloon 300 can gradually expand from the distal end to the proximal end as expected, achieving precise treatment. During the pressure relief stage 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 toward the distal direction, causing the baffle to deform and open toward the distal direction, and the filling medium enters the distal filling chamber 310 through the four reflux holes 422 of the second baffle unit 420.

[0050] Furthermore, the reflux hole 422 between any two adjacent second deformation seams 421 is arranged in the middle position between the two second deformation seams 421. In this way, it can be ensured that during the inflation process of the balloon body 300, the baffle can more fully cover the sealed reflux hole 422. In addition, this regular layout method is more convenient for mold design, implementation of processing technology, and quality inspection during the production and manufacturing process of balloon dilatation catheters. During production, the position and size of the reflux hole 422 can be more accurately controlled, reducing the product rejection rate due to position deviation; in the quality inspection link, it is also easier to formulate unified inspection standards and quickly determine whether the product meets the design requirements, thereby improving production efficiency and reducing production costs.

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

[0052] In addition, balloon dilatation catheters are generally divided into rapid exchange type (RX) and overall exchange type (OTW). The balloon body 300 is usually located at the distal end of the catheter body 100. The balloon body is generally made of polymer tubing such as nylon and polyamide through drawing and blow molding. The rapid exchange balloon catheter is provided with a rapid exchange port so that it can be used in conjunction with other instruments such as guide wires. Filling media such as gas or liquid enters the catheter body 100 through the proximal end and eventually reaches the interior of the balloon body 300 along the catheter body 100 to fill it. The overall exchange balloon catheter is not provided with a rapid exchange port. The proximal end of the catheter body 100 is connected to the operating handle 200. Filling media such as gas or liquid enters the catheter body 100 through the operating handle 200 and eventually reaches the interior of the balloon body 300 to fill it.

[0053] Based on the pathogenesis of vascular stenosis and restenosis, and in conjunction with the expansion function of balloon 300, drugs such as paclitaxel and rapamycin that can treat vascular stenosis and inhibit restenosis can be sprayed onto the surface of balloon 300. Alternatively, depending on the actual use of balloon 300, a corresponding therapeutic drug can be sprayed onto the surface of the balloon 300. This allows the drug to be released into the contacted vascular wall during balloon 300 expansion, thereby achieving the corresponding therapeutic purpose. In this embodiment, a whole-exchange (OTW) balloon dilation catheter is used.

[0054] Specifically, when performing dilatation surgery on a narrowed blood vessel, the doctor first introduces the balloon dilatation catheter into the blood vessel through the puncture site, and guides the balloon body 300 to the narrowed blood vessel under the guidance of the guide wire. Subsequently, the filling medium is injected into the filling channel 110 through the filling and discharging device connected to the operating handle 200. Since the first deformation seam 411 and the second deformation seam 421 do not deform or deform slightly in the initial stage of filling, the filling medium preferentially enters the farthest filling chamber 310 through the filling hole 130, causing the chamber to be quickly filled. Figure 4 As shown, at this time, the medium in the most distal filling chamber 310 pushes the first barrier unit 410 and the second barrier unit 420 to fit together and deform toward the proximal direction, and the distal end of the balloon body 300 initially expands to initially dilate the distal stenosis of the blood vessel, as shown in FIG. Figure 7 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, and the filling medium passes through the barrier assembly 400 and enters the adjacent proximal filling chamber 310, completing the filling of each filling chamber 310 of the balloon body 300 in sequence, achieving gradual and precise expansion of the stenotic area of ​​the blood vessel.

[0055] When the operation is completed and the balloon body 300 needs to be depressurized, the filling medium is sucked out from the outside by operating the filling medium filling and discharging device at the position of the operating handle 200. The medium in the filling chamber 310 flows to the filling chamber 310 at the distal end, thereby pushing the baffle to deform in the distal direction to release the cover of the reflux hole 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 dilatation 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 segmented balloon dilatation catheter provided by the present invention can achieve the goal of filling the distal end of the balloon body 300 first during filling, with the distal end being fixed to the blood vessel before the proximal end is filled in sequence. This prevents slippage or jerking of the catheter body 100 during filling, thereby eliminating the limitations of inaccurate positioning during expansion by existing balloon dilatation catheters, achieving precise expansion and reducing vascular damage. This facilitates achieving more ideal therapeutic effects, effectively avoids various abnormal symptoms caused by balloon jerking, reduces risks during clinical surgery, and has promising clinical application prospects.

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

[0058] The above are only 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 are within the scope of protection of the pending claims of the present invention.

Claims

1. A segmentally inflatable balloon dilatation catheter, characterized in that: include: A catheter body (100), the catheter body (100) is used to be introduced into a target blood vessel, and the catheter body (100) has an axially extending filling channel (110) therein; an operating handle (200), the operating handle (200) being disposed at the proximal end of the catheter body (100) and being used for filling or releasing a filling medium into the filling channel (110); A balloon body (300) is provided at a position of the catheter body (100) close to the distal end at a set distance. The balloon body (300) has a plurality of filling chambers (310) arranged axially therein, a filling channel (110) is connected to the filling chamber (310) at the farthest end, and a barrier assembly (400) is provided between any two adjacent filling chambers (310) to ensure that during the filling process of the balloon body (300), the plurality of filling chambers (310) are filled in sequence from the distal end to the proximal end.

2. The segmentally inflatable balloon dilatation catheter according to claim 1, characterized in that: The barrier assembly (400) comprises a first barrier unit (410) and a second barrier unit (420) arranged adjacent to each other, the first barrier unit (410) being arranged at a position toward the distal end of the filling chamber (310), the first barrier unit (410) having a first deformation slit (411) extending through both sides, the second barrier unit (420) having a second deformation slit (421) extending through both sides, the first deformation slit (411) and the second deformation slit (421) being arranged opposite to each other; In the early stage of filling, the first deformation seam (411) and the second deformation seam (421) do not deform or deform slightly to ensure that the filling chamber (310) near the distal end is quickly filled. In the later stage of filling, under the pressure of the filling medium, the first deformation seam (411) and the second deformation seam (421) expand and deform to allow the filling medium to pass through in large quantities and fill the adjacent proximal filling chamber (310).

3. The segmentally inflatable balloon dilatation catheter according to claim 2, characterized in that: The first barrier unit (410) includes a plurality of circumferentially arranged barrier sheets, and the side of each barrier sheet away from the catheter body (100) is fixedly connected to the inner wall of the balloon body (300), and the gap between any two adjacent barrier sheets constitutes the first deformation seam (411).

4. The segmentally inflatable balloon dilatation catheter according to claim 3, characterized in that: The second barrier unit (420) comprises an integrally arranged circular diaphragm, which is sleeved on the catheter body (100) and fixedly connected to the inner wall of the balloon body (300) in the circumferential direction. A plurality of the second deformation seams (421) are arranged at intervals in the circumferential direction around the center of the circular diaphragm.

5. The segmentally inflatable balloon dilatation catheter according to claim 2, characterized in that: The first deformation seam (411) and the second deformation seam (421) are both in a straight line shape.

6. The segmentally inflatable balloon dilatation catheter according to claim 3, characterized in that: The barrier assembly (400) is also provided with a pressure relief component for relieving pressure of the balloon body (300).

7. The segmentally inflatable balloon dilatation catheter according to claim 6, characterized in that: The pressure relief component is a reflux hole (422) provided through the circular diaphragm, and the reflux hole (422) is provided at a position that can be completely covered by the barrier sheet.

8. The segmentally inflatable balloon dilatation catheter according to claim 7, characterized in that: The return hole (422) between any two adjacent second deformation seams (421) is arranged at a middle position between the two second deformation seams (421).

9. The segmentally inflatable balloon dilatation catheter according to any one of claims 1 to 8, characterized in that: The catheter body (100) comprises a protective layer (101), a support layer (102) and a guide layer (103) arranged in sequence from the outside to the inside, the guide layer (103) comprises an axially extending lumen (120) therein, and the filling channel (110) is arranged on one side of the lumen (120).

10. The segmentally inflatable balloon dilatation catheter according to any one of claims 9, characterized in that: The cross section of the filling channel (110) is in the shape of an arc arranged around the lumen (120).

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