Pulmonary vessel balloon dilatation catheter

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a pulmonary vessel balloon dilatation catheter. The pulmonary vessel balloon dilatation catheter comprises a balloon, and the balloon comprises a balloon body, a far-end cone-shaped body and a near-end cone-shaped body, wherein the far-end cone-shaped body and the near-end cone-shaped body are arranged at the two ends of the balloon body respectively. Wherein the balloon body is of a conical structure, and the diameter of the near end of the balloon body is larger than that of the far end of the balloon body. The pulmonary blood vessel balloon dilatation catheter is designed according to the characteristics of pulmonary artery anatomy, the balloon body can be well attached to the wall of a pulmonary artery when dilated under working pressure, and therefore the occurrence rate of blood vessel injuries can be reduced; and the diameter of the far end part of the balloon body is smaller, so that the balloon body can pass through the vascular lesion part more easily, the interventional operation is simplified, and the operation safety and effect are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical apparatus and instruments, especially relates to a pulmonary vessel balloon dilatation catheter. BACKGROUND

[0002] Vascular stenosis caused by various reasons is very common in clinic, when thrombus blocks pulmonary artery to cause pulmonary vascular obstruction or stenosis, it causes ventilation blood flow ratio imbalance, at the same time, with the increase of pulmonary vascular resistance, pulmonary artery pressure also rises, shows pulmonary circulation and respiratory dysfunction, when acute thrombosis is not completely dissolved, forms chronic pulmonary embolism, can cause patient's cardiopulmonary function to decline, severe person can lead to chronic thromboembolic pulmonary hypertension, finally leads to right heart dysfunction even right heart failure, is the serious long-term complication of acute pulmonary embolism, seriously affects patient's life quality even endangers life.

[0003] Balloon pulmonary angioplasty (BPA) is a percutaneous pulmonary artery interventional therapy technology developed rapidly in recent years, which uses pulmonary vessel balloon dilatation catheter for treatment. The balloon in the existing pulmonary vessel balloon dilatation catheter is a columnar balloon with uniform external dimensions, but because the pulmonary artery is conical and shrinks, the existing columnar balloon does not fit well with the pulmonary vessel wall when expanding, so that the incidence of vascular injury is high. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of pulmonary vessel conical pulmonary vessel balloon dilatation catheter for solving the technical problem that existing columnar balloon cannot be well fitted with the pulmonary vessel wall when expanding.

[0005] The utility model provides a kind of pulmonary vessel conical pulmonary vessel balloon dilatation catheter, including balloon, the balloon includes balloon body and respectively setting in the two ends of the balloon body far end conical body and proximal conical body;

[0006] Wherein, the balloon body is configured as conical structure, and the diameter of the proximal end of the balloon body is greater than the diameter of the distal end of the balloon body.

[0007] In one embodiment, the balloon body is a circular truncated cone structure, and the taper of the balloon body under working pressure is 1:10 to 1:12.

[0008] In one embodiment, the outer wall of one or more of the balloon body, the far end conical body and the proximal conical body is a smooth wall structure;Or

[0009] The outer wall of one or more of the balloon body, the far end conical body and the proximal conical body is provided with anti-displacement protrusions, and the anti-displacement protrusions are a plurality of spines or a plurality of thread-like protrusions.

[0010] In one embodiment, a hydrophilic coating is provided on the surfaces of the balloon body, the distal taper and the proximal taper.

[0011] In one embodiment, the length of the balloon is 20mm to 40mm.

[0012] In one embodiment, a tip, an inner tube and an outer tube are further included, the tip is connected to the distal taper through a distal connecting part, the outer tube is connected to the proximal taper through a proximal connecting part, the inner tube is arranged in the balloon, and both ends of the inner tube respectively extend out of the distal taper and the proximal taper, the distal end of the inner tube passes through the distal connecting part and is connected to the tip, and the proximal end of the inner tube extends into the outer tube.

[0013] In one embodiment, the tip, the balloon, the inner tube and the outer tube are coaxially arranged.

[0014] In one embodiment, a guide wire cavity for passing an interventional guide wire is arranged in the inner tube, the diameter of the guide wire cavity is 0.30mm to 0.90mm, and the guide wire cavity can pass an interventional guide wire with a diameter of 0.014 inch to 0.035 inch.

[0015] In one embodiment, a plurality of developing marks for positioning the balloon are further arranged on the inner tube, and the developing marks are respectively located at preset positions of the inner tube.

[0016] In one embodiment, an opening for passing the proximal end of the inner tube is arranged on the tube wall of the outer tube, the opening is located at a middle position of the outer tube, and the proximal end of the inner tube communicates with the opening.

[0017] In one embodiment, a catheter seat and a hypotube are further included, the proximal end of the outer tube is connected to the distal end of the hypotube, a pressurizing cavity is arranged in the catheter seat, and the proximal end of the hypotube extends into the catheter seat and is connected to the pressurizing cavity.

[0018] Compared with the prior art, the pulmonary vessel balloon dilatation catheter is designed according to the anatomical characteristics of the pulmonary artery, the balloon body is constructed as a conical structure, the diameter of the proximal end of the balloon body is larger than the diameter of the distal end of the balloon body, so that the balloon body can well conform to the wall of the pulmonary artery when expanding under working pressure, thereby reducing the incidence of vascular injury; and the diameter of the distal end of the balloon body is smaller, so that the balloon body is more easily passed through the vascular lesion, thereby facilitating the operation of the interventional surgery and improving the safety and effect of the surgery. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present invention will be described in more detail below based on embodiments with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the local anatomical taper of the pulmonary artery;

[0021] Figure 2 A schematic diagram of a tapered pulmonary vascular balloon dilatation catheter inserted into the pulmonary artery for treatment in one embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the overall structure of a pulmonary vascular balloon dilatation catheter in one embodiment of the present invention;

[0023] Figure 4 is a cross-sectional view of a pulmonary vascular balloon dilatation catheter in one embodiment of the present invention;

[0024] Figure 5 for Figure 4 Enlarged view at point A;

[0025] Figure 6 is a cross-sectional view of a balloon in another embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of welding at the proximal connection portion of the balloon in one embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of welding at the distal connection portion of the balloon in one embodiment of the present invention.

[0028] Figure 9 This is a schematic diagram of welding the inner tube and the outer tube, and the outer tube and the hypotube in one embodiment of the present invention.

[0029] Reference numerals:

[0030] 100. Pulmonary vascular balloon dilatation catheter;

[0031] 1. Tip; 2. Balloon; 21. Distal cone; 22. Balloon body; 23. Proximal cone; 24. Anti-displacement protrusion;

[0032] 3. Inner tube; 4. Outer tube; 41. Opening;

[0033] 5. Hypotube; 6. Catheter hub; 7. Proximal connection; 8. Distal connection; 9. Visual marker; 10. Marker ring; 11. Proximal opening of the guidewire lumen; 12. Outer tube welding axis; 13. Inner tube welding axis;

[0034] 14. Pulmonary artery, 15- Pulmonary artery taper.

[0035] Figures 1-9These drawings are schematic drawings and are not drawn according to actual sizes or proportions. DETAILED DESCRIPTION

[0036] The present invention will be further described below with reference to the accompanying drawings.

[0037] According to the location of pulmonary artery thromboembolism, chronic pulmonary embolism is divided into four types: Type 1 is thrombus involving one main pulmonary artery (when the thrombus completely blocks one pulmonary artery, it is called IC type), Type 2 is lobar pulmonary artery thrombosis, Type 3 is segmental pulmonary artery thrombosis, and Type 4 is subsegmental pulmonary artery and distal thrombosis. Proximal organized thrombus can be evaluated for pulmonary thromboendarterectomy (PEA), which can relieve symptoms to the greatest extent and make hemodynamic indicators close to normal. However, studies have shown that about 34% of CTEPH patients cannot undergo PEA treatment due to remote thrombus location, advanced age, and comorbidities with other diseases. About 16% of patients have residual pulmonary hypertension after PEA surgery. The CHEST-1 study used oral riociguat to treat CTEPH who could not undergo PEA surgery. The results showed that after 16 weeks of treatment, PVR decreased by 226 dyn·s·cm -5 , the 6-minute walking distance increased by 39 meters. Although the targeted drug riociguat can improve patients' exercise tolerance and reduce pulmonary vascular resistance, the degree of improvement is limited.

[0038] Balloon pulmonary angioplasty (BPA) is a percutaneous pulmonary artery interventional treatment technique that has developed rapidly in recent years. It uses a balloon catheter to dilate narrowed or occluded pulmonary arteries to improve pulmonary artery blood flow, reduce pulmonary vascular resistance, and improve clinical symptoms. In 1988, Voorburg first used balloon dilation to treat a patient with pulmonary hypertension caused by pulmonary embolism. In 2001, American scholars Feinstein et al. reported the clinical efficacy of BPA in treating 18 CTEPH patients who could not undergo PEA. Due to complications, it has not been widely used. Since 2012, with the application of the modified fractionated and step-by-step dilation BPA technology, the incidence of reperfusion pulmonary edema (RPE) and vascular injury has been significantly reduced. A meta-analysis showed that the 6-minute walk distance in the BPA group increased by 141.80 m, the mean pulmonary artery pressure decreased by 18.31 mmHg, and the pulmonary vascular resistance decreased by 443.49 dyn·s·cm. -5 The perioperative, 2-year and 3-year survival rates were 100%, 99% and 97%, respectively. BPA brings new treatment hope for CTEPH patients who cannot undergo PEA.

[0039] After the main pulmonary artery branches out into the left and right pulmonary arteries and enters the lungs through the hilum, it branches repeatedly and becomes thinner and thinner, and finally forms a capillary network that surrounds the alveolar wall for gas exchange. The pulmonary artery is different from the systemic artery in structure and function. The pulmonary circulation pathway is shorter than the systemic circulation, the blood vessel wall is thinner, the cross-sectional area is larger, the pulmonary blood vessels have many branches, and the inner diameter of the blood vessels varies greatly. As a result, the treatment strategy of pulmonary vascular balloon dilatation is different from that of the systemic artery. Under normal circumstances, the diameter of the main pulmonary artery is comparable to that of the aorta at the same level, but the pulmonary artery quickly branches into lobar pulmonary arteries, and then branches into segmental pulmonary arteries, such as Figure 1 As shown, the vascular inner diameter varies significantly, causing the pulmonary artery to taper from proximal to distal. When a pulmonary artery obstruction requires balloon dilatation, using existing cylindrical balloons, because the distal and proximal diameters of cylindrical balloons are identical, selecting a cylindrical balloon based on the diameter of the distal lesion can lead to insufficient dilatation of the proximal vessel. Conversely, selecting a cylindrical balloon based on the proximal diameter can lead to excessive dilatation of the distal vessel and even vascular damage, increasing the incidence of complications.

[0040] like Figures 2-9 As shown, the present invention provides a pulmonary vascular balloon dilatation catheter 100, which has better application value in the interventional treatment of pulmonary blood vessels, because the pulmonary vascular balloon dilatation catheter 100 of the present invention can fit well with the wall of the pulmonary artery during expansion, which can avoid insufficient vascular expansion and reduce the incidence of vascular damage during existing cylindrical balloon dilatation treatment, thereby facilitating the operation of interventional surgery and improving surgical safety and effectiveness; at the same time, since the embolic lesions in the pulmonary artery are organized thrombi, and the diameter of the distal end of the pulmonary vascular balloon dilatation catheter 100 of the present invention is smaller than that of the cylindrical balloon, it is easier to pass through the vascular lesions, thereby improving the success rate of the operation.

[0041] Specifically, if Figure 3 、 Figure 4 and Figure 5 As shown in FIG. 1 , the pulmonary vascular balloon dilatation catheter 100 of the present invention includes a balloon 2, which includes a balloon body 22 and a distal tapered body 21 and a proximal tapered body 23 respectively disposed at both ends of the balloon body 22. The balloon body 22 is configured as a cone-shaped structure, and the diameter of the proximal end of the balloon body 22 is larger than the diameter of the distal end of the balloon body 22.

[0042] By designing balloon body 22 as a cone, its shape closely matches the shape of the pulmonary artery wall. Therefore, when expanded under operating pressure, balloon body 22 conforms well to the pulmonary artery wall, thereby reducing the incidence of vascular damage. Furthermore, because the distal end of balloon body 22 has a smaller diameter, it is easier to pass through vascular lesions, thereby improving the success rate of the procedure.

[0043] Preferably, the balloon body 22 is a truncated cone structure, that is, the diameter of the balloon body 22 gradually decreases from the proximal end to the distal end. The taper of the balloon body 22 under working pressure is 1:10 to 1:12. The working pressure of the balloon body 22 is 6-8 atmospheres. Figure 5 As shown, the taper of the balloon body 22 is (d2-d1) / h1, d2 is the diameter of the proximal end of the balloon body 22, d1 is the diameter of the distal end of the balloon body 22, and h1 is the length of the balloon body 22.

[0044] like Figure 1 As shown, analysis of the pulmonary artery anatomy from pulmonary vascular CTA and pulmonary artery angiography reveals a tapered narrowing trend of the pulmonary artery, with a taper of 1:10 to 1:12. Therefore, in the present invention, the taper of the balloon body 22 is set to 1:10 to 1:12, allowing the balloon body 22 to almost completely conform to the pulmonary artery wall, thereby preventing inadequate vascular dilation and reducing the incidence of vascular damage during conventional cylindrical balloon dilation treatments.

[0045] Therefore, the pulmonary vascular balloon dilatation catheter 100 of the present invention is designed based on the tapered anatomical features of the pulmonary artery. Its tapered balloon structure overcomes the problem of existing cylindrical balloons not being able to conform well to the pulmonary vascular wall during dilatation. This reduces the incidence of vascular damage during treatment using existing cylindrical balloons, while improving surgical safety and success rates. Furthermore, the pulmonary vascular balloon dilatation catheter 100 of the present invention can rapidly treat pulmonary artery lesions, effectively preventing overdilation of distal pulmonary vessels and enhancing the safety of balloon dilatation procedures.

[0046] The balloon body 22, the distal tapered body 21, and the proximal tapered body 23 can be an integral structure. The distal tapered body 21 and the proximal tapered body 23 can also be configured as a truncated cone structure. The diameter of the distal tapered body 21 gradually decreases in the direction away from the balloon body 22, and the diameter of the proximal tapered body 23 gradually decreases in the direction away from the balloon body 22. The distal tapered body 21 and the proximal tapered body 23 can play a certain guiding role.

[0047] The distal conical body 21 is provided with a distal connection portion 8 on the side away from the balloon body 22. The distal connection portion 8 may be, for example, a connecting tube. The proximal conical body 23 is provided with a proximal connection portion 7 on the side away from the balloon body 22. The proximal connection portion 7 may be, for example, a connecting tube. The distal connection portion 8 and the proximal connection portion 7 are respectively used to connect to the tip 1 and the outer tube 4 described below.

[0048] The length h2 of the balloon 2 is 20mm-40mm. Figure 5 As shown, the length h2 of the balloon 2 is the sum of the lengths of the distal connecting portion 8 , the distal cone 21 , the balloon body 22 , the proximal cone 23 , and the proximal connecting portion 7 .

[0049] The balloon 2 may be a semi-compliant balloon, for example. A semi-compliant balloon means that when the balloon filling pressure continues to increase between the nominal pressure and the bursting pressure, the balloon diameter still increases by about 0.25-0.75 mm above the predetermined diameter.

[0050] like Figure 5 As shown, the outer walls of the balloon body 22, the distal cone 21 and the proximal cone 23 are all smooth wall structures, that is, the surfaces of the balloon body 22, the distal cone 21 and the proximal cone 23 are smooth surfaces. Figure 6 As shown, one or more of the balloon body 22, the distal tapered body 21, and the proximal tapered body 23 are provided with anti-displacement protrusions 24 on their outer walls. The anti-displacement protrusions 24 can reduce displacement of the balloon 2 during expansion. The anti-displacement protrusions 24 can be, for example, multiple spinous processes or multiple thread-like protrusions. The spinous processes can be shaped like a semicircle, a triangle, or the like.

[0051] A hydrophilic coating may be provided on the surface of the balloon body 22, the distal cone 21 and the proximal cone 23. During manufacture, the balloon 2 may be coated with the hydrophilic coating and then folded, or folded and then coated with the hydrophilic coating.

[0052] The pulmonary vascular balloon dilatation catheter 100 of the present invention further comprises a tip 1, an inner tube 3, an outer tube 4, a hypotube 5, and a catheter hub 6. The tip 1 is connected to the distal tapered body 21 via a distal connector 8. The inner tube 3 is located within the balloon 2, with the distal and proximal ends of the inner tube 3 extending from the distal tapered body 21 and the proximal tapered body 23, respectively. The distal end of the inner tube 3 passes through the distal tapered body 21 and the distal connector 8 to connect to the tip 1, while the proximal end of the inner tube 3 extends into the outer tube 4.

[0053] The tip 1, the balloon 2, the inner tube 3, the outer tube 4, the hypotube 5 and the catheter seat 6 are all coaxially arranged.

[0054] Preferably, the inner tube 3 is also provided with a plurality of imaging marks 9 for positioning the balloon 2, and the imaging marks 9 are respectively located at preset positions of the inner tube 3. The preset positions of the inner tube 3 can be, for example, the distal end of the balloon 2, the proximal end of the balloon 2, and the middle position of the balloon 2. More specifically, the preset positions of the inner tube 3 can be, for example, the position of the inner tube 3 on the tube section inside the balloon 2 close to the proximal connection part 7, the position close to the distal connection part 8, and the position in the middle of the balloon 2. Figure 3 and Figure 4 As shown, after the pulmonary vascular balloon dilatation catheter 100 enters the human body, the balloon 2 can be accurately positioned by the imaging mark 9 through fluoroscopy.

[0055] The inner tube 3 is provided with a guidewire lumen for passage of an interventional guidewire. The diameter of the guidewire lumen is 0.30 mm to 0.90 mm, preferably 0.30 mm to 0.50 mm. The proximal end of the inner tube 3 is provided with a guidewire lumen proximal opening 11, which is connected to the guidewire lumen. The guidewire lumen proximal opening 11 can be located, for example, at the mid-distal end of the outer tube 4. The guidewire lumen is used to pass an interventional guidewire with a diameter of 0.014 inches to 0.035 inches.

[0056] An opening 41 for the proximal end of the inner tube 3 to pass through is provided on the wall of the outer tube 4. The opening 41 is located in the middle of the outer tube 4. The proximal end of the inner tube 3 is connected to the opening 41. The proximal opening 11 of the guidewire cavity can be located inside the outer tube 4 or outside the outer tube 4. The diameter of the interventional guidewire is smaller than the inner diameter of the tip 1. Therefore, the interventional guidewire can be inserted into the guidewire cavity through the tip 1 and extended from the proximal opening 11 of the guidewire cavity. Specifically, when performing an interventional operation, the operator first places the interventional guidewire in the blood vessel, and then inserts the tip 1 from the tail of the interventional guidewire. The interventional guidewire can enter the guidewire cavity, and the interventional guidewire reaches the proximal opening 11 of the guidewire cavity along the guidewire cavity and extends from the proximal opening 11 of the guidewire cavity. The interventional guidewire is fixed, and the operator can push and pull back the pulmonary vascular balloon dilatation catheter 100 by operating the proximal end of the pulmonary vascular balloon dilatation catheter 100.

[0057] The distal end of the outer tube 4 is connected to the proximal connection portion 7, the proximal end of the outer tube 4 is connected to the distal end of the hypotube 5, and the proximal end of the hypotube 5 is connected to the catheter seat 6. The hypotube 5 is provided with a marking ring at a preset distance from the tip. Figure 4 As shown, marker rings 10 are provided at distances of 90 cm and 100 cm from the hypotube 5 to the tip 1 , respectively.

[0058] In one embodiment, Figure 4 As shown in FIG, a pressurization chamber is provided in the catheter adapter 6. The proximal end of the hypotube 5 extends into the catheter adapter 6 and is connected to the pressurization chamber. The pressurizing device sequentially applies pressure to the interior of the balloon 2 through the pressurization chamber, hypotube 5, and outer tube 4. The catheter adapter 6 is provided with a connection port communicating with the pressurization chamber for connection to the pressurizing device.

[0059] In one embodiment, the tip 1 is configured as a cone-shaped structure or its shape has a cone-shaped changing trend to increase the passability of the pulmonary vascular balloon dilatation catheter 100. The tip 1 can be configured into a cone-shaped structure by a thermoplastic method.

[0060] like Figure 7 As shown, with the support of the outer tube welding axis 12, the distal end of the outer tube 4 and the proximal connecting portion 7 are welded, and the welding methods include but are not limited to laser welding, hot melt welding or medical bonding.

[0061] like Figure 8As shown, with the support of the inner tube welding axis 13, the distal end of the inner tube 3 is welded to the distal connection portion 8, and the welding method includes but is not limited to laser welding, hot melt welding or medical bonding.

[0062] like Figure 8 As shown, when the distal end of the inner tube 3 is connected to the distal connection portion 8, the interior of the inner tube 3 can be supported. For example, an inner tube welding core 13 can be provided in the inner tube 3 to support the inner tube 3. The inner tube welding core 13 can extend from the tip 1 into the inner tube 3 and out of the proximal opening 11 of the guidewire lumen to provide support for the inner tube 3, facilitating welding between the inner tube 3 and the distal connection portion 8, and between the inner tube 3 and the outer tube 4, and preventing the inner tube 3 from collapsing during welding.

[0063] The inner tube welding axis 13 can be a guide wire structure, which can be straight or curved, for example, according to Figure 8 The bent state shown extends out of the proximal opening 11 of the guidewire lumen.

[0064] like Figure 9 As shown, when connecting the inner tube 3 to the outer tube, the interior of the outer tube 4 can be supported. For example, an outer tube welding core 12 can be provided in the outer tube 4. With the support of the outer tube welding core 12 and the inner tube welding core 13, the proximal end of the inner tube 3 is welded to the opening 41 of the outer tube 4. Welding methods include, but are not limited to, laser welding, hot melt welding, or medical adhesive bonding.

[0065] The outer tube welding axis 12 may be, for example, a guide wire structure, which may be inserted into the outer tube 4 to provide support and prevent the outer tube 4 from collapsing during welding.

[0066] The following is a detailed description of the process of performing dilation treatment using the pulmonary vascular balloon dilation catheter 100 of the present invention.

[0067] like Figure 2 As shown, the operator determines the location of pulmonary vascular lesions through pulmonary artery angiography, and selects a pulmonary vascular balloon dilatation catheter 100 of corresponding specifications according to the actual diameter of the blood vessels at the lesion site. After the guide wire passes through the lesion site, the pulmonary vascular balloon dilatation catheter 100 is sent along the guide wire cavity to reach the lesion site for dilation treatment.

[0068] When performing balloon dilatation for stenotic or occluded pulmonary arteries in patients with chronic thromboembolic pulmonary hypertension, a fractionated and stepwise dilatation strategy can be chosen to reduce the incidence of complications such as vascular injury and reperfusion pulmonary edema.

[0069] The descriptions of "distal end" and "proximal end" mentioned in the present invention are defined according to the usual meaning, wherein the "proximal end" is the end relatively close to the operator or the catheter seat 6, and the "distal end" is the end relatively far away from the operator or the catheter seat 6. It is only for the convenience of description and is not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0070] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0071] While the present invention has been described with reference to preferred embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner, provided no structural conflicts exist. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A pulmonary vascular balloon dilatation catheter, characterized in that: The balloon comprises a balloon body and a distal cone and a proximal cone respectively arranged at two ends of the balloon body; The balloon body is constructed as a cone-shaped structure, and the diameter of the proximal end of the balloon body is larger than the diameter of the distal end of the balloon body.

2. The pulmonary vascular balloon dilatation catheter according to claim 1, characterized in that: The balloon body is a truncated cone structure, and the taper of the balloon body under working pressure is 1:10 to 1:

12.

3. The pulmonary vascular balloon dilatation catheter according to claim 1 or 2, characterized in that: The outer wall of one or more of the balloon body, the distal cone and the proximal cone is a smooth wall structure; or Anti-displacement protrusions are provided on the outer walls of one or more of the balloon body, the distal cone and the proximal cone. The anti-displacement protrusions are a plurality of spinous processes or a plurality of thread-like protrusions.

4. The pulmonary vascular balloon dilatation catheter according to claim 1 or 2, characterized in that: The surfaces of the balloon body, the distal cone and the proximal cone are all provided with a hydrophilic coating.

5. The pulmonary vascular balloon dilatation catheter according to claim 1 or 2, characterized in that: The length of the balloon is 20 mm to 40 mm.

6. The pulmonary vascular balloon dilatation catheter according to claim 1 or 2, further comprising a tip, an inner tube, and an outer tube, wherein the tip is connected to the distal tapered body via a distal connecting portion, and the outer tube is connected to the proximal tapered body via a proximal connecting portion; the inner tube is disposed in the balloon, and both ends of the inner tube extend from the distal tapered body and the proximal tapered body, respectively; the distal end of the inner tube passes through the distal connecting portion and is connected to the tip, and the proximal end of the inner tube extends into the outer tube; in, The tip, the balloon, the inner tube and the outer tube are all coaxially arranged.

7. The pulmonary vascular balloon dilatation catheter according to claim 6, characterized in that: The inner tube is provided with a guidewire cavity for the passage of an interventional guidewire. The diameter of the guidewire cavity is 0.30 mm to 0.90 mm. The guidewire cavity can allow the passage of an interventional guidewire with a diameter of 0.014 inches to 0.035 inches.

8. The pulmonary vascular balloon dilatation catheter according to claim 6, characterized in that: The inner tube is also provided with a plurality of developing marks for positioning the balloon, and the developing marks are respectively located at preset positions of the inner tube.

9. The pulmonary vascular balloon dilatation catheter according to claim 6, characterized in that: An opening for the proximal end of the inner tube to pass through is provided on the tube wall of the outer tube. The opening is located in the middle of the outer tube, and the proximal end of the inner tube is communicated with the opening.

10. The pulmonary vascular balloon dilatation catheter according to claim 6, characterized in that: It also includes a catheter seat and a hypotube, the proximal end of the outer tube is connected to the distal end of the hypotube, a pressurized cavity is provided in the catheter seat, the proximal end of the hypotube extends into the catheter seat and is connected to the pressurized cavity.

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