A dilatation balloon

Abstract

The utility model relates to a kind of expansion balloon, belong to medical instrument technical field.Balloon dilatation catheter includes inner tube, outer tube and balloon on the outer circumferential surface of the inner tube, the balloon includes fixed part, expansion part and tail end part;The expansion part is located between the fixed part and the tail end part, the fixed part and the expansion part are cylindrical, and woven mesh is sleeved on the outer circumferential surface of the expansion part, and the woven mesh covers more than half of the outer circumferential surface area of expansion part.Tail end part is clamped in blood vessel opening site, and expansion part is fixed by fixed part and tail end part simultaneously, to prevent the movement of expansion part, improve stability;And woven mesh is sleeved on the outer circumferential surface of expansion part, forms pillow part protrusion after swelling, reduces the contact area of fixed part and blood vessel inner wall, prevents excessive swelling, destroys blood vessel inner wall, improves safety.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an expandable balloon. Background Technology

[0002] Atherosclerosis is a major cause of coronary heart disease, cerebral infarction, and peripheral vascular disease. Atherosclerotic stenosis can occur anywhere in the blood vessels of the body, but it is more common at the opening of blood vessels.

[0003] To alleviate these problems, there are currently two methods: one is to use a balloon dilation catheter, and the other is to use a stent. A balloon dilation catheter is used to dilate the narrowed area to restore the blood vessel size; however, if aortic dissection or recoil occurs, a stent needs to be implanted using a balloon dilation catheter to support the blood vessel.

[0004] Balloon dilation catheters mainly consist of a balloon section. Whether used alone or in conjunction with a stent, the balloon expands to support narrowed areas or increase in diameter. However, during balloon inflation, the dilated stent forms a unique funnel-shaped structure, conforming to the anatomy of the vertebral artery opening, allowing the stent to adhere tightly to the vessel wall. As the funnel-shaped balloon expands, a reaction force is generated to move the balloon proximally in order for the stent to conform to the vertebral opening. This can cause the balloon section to shift in position. Furthermore, since there are no constraints on the outer surface of the balloon section during inflation, there is a risk that the balloon may rupture the vessel. Utility Model Content

[0005] Based on the above analysis, the present invention aims to provide an expansion balloon that can ensure greater stability and safety of the balloon expansion catheter during use.

[0006] This utility model provides an inflatable balloon, including an inner tube, an outer tube sleeved on the outer circumferential surface of the inner tube, and a balloon. The balloon includes a fixing part, an inflatable part, and a tail end. The fixing part, the inflatable part, and the tail end are separated by a partition ring.

[0007] The expansion portion is located between the fixing portion and the tail end. Both the fixing portion and the expansion portion are cylindrical, and a woven mesh is fitted on the outer peripheral surface of the expansion portion, covering more than half of the outer peripheral surface area of ​​the expansion portion.

[0008] Furthermore, the woven mesh has a semi-cylindrical structure, with both ends of the woven mesh fixed to the separating rings.

[0009] Furthermore, the woven mesh can rotate around the central axis of the expansion section, changing the restricted direction of the woven mesh.

[0010] Furthermore, the thickness of the fixed part, the expansion part, and the tail end of the balloon are different, and in order from thinnest to thickest, they are the fixed part, the tail end, and the expansion part.

[0011] Furthermore, a woven mesh is fitted on the outer peripheral surface of the fixing part. The woven mesh is composed of evenly distributed annular fiber bands, and the annular fiber bands are connected to each other by multiple fixing bands. When the balloon inflates, a occipital protrusion is formed, and the direction of the occipital protrusion is away from and perpendicular to the central axis of the fixing part.

[0012] Furthermore, the woven mesh is composed of annular fiber strips and semi-annular fiber strips, with the semi-annular fiber strips being spaced apart and relatively distributed, and the fiber strips being connected to each other by a fixing belt.

[0013] Furthermore, multiple developing marks are provided on the inner tube, and the distance between the developing marks is greater than or equal to the length of the expansion section.

[0014] Furthermore, the tail end of the balloon is sealed to the outer tube, and the fixing part of the balloon is sealed to the inner tube, forming a closed space.

[0015] Furthermore, the woven mesh is made of polymeric materials, including polypropylene, PLLA, PEEK, PI, aramid, polyester fiber, aromatic polyester, carbon fiber, and aliphatic polyamide.

[0016] Furthermore, the woven mesh is made of metal, including 304 stainless steel, 316 stainless steel, and cobalt-chromium alloy.

[0017] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0018] In this invention, the balloon is divided into three parts: a fixing part, an expansion part, and a tail end. The tail end is engaged with the opening of the blood vessel. The expansion part is fixed by both the fixing part and the tail end to prevent movement of the expansion part and improve stability. A woven mesh is fitted on the outer peripheral surface of the expansion part. After expansion, it forms a occipital protrusion, which reduces the contact area between the expansion part and the inner wall of the blood vessel, prevents over-expansion and damage to the inner wall of the blood vessel, and improves safety.

[0019] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the description and accompanying drawings, which are particularly pointed out. Attached Figure Description

[0020] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0021] Figure 1 This is a schematic diagram showing the position of the balloon dilation catheter at the opening of the blood vessel.

[0022] Figure 2 This is a diagram showing the overall structure of a balloon dilation catheter;

[0023] Figure 3 This is a schematic diagram of the woven mesh structure at the expansion section of Example 1;

[0024] Figure 4 This is a schematic diagram of the woven mesh structure at the fixing part in Example 1;

[0025] Figure 5 This is a schematic diagram of the woven mesh structure at the fixing part in Example 2;

[0026] Figure 6 This is a schematic diagram of the woven mesh structure at the fixing part in Example 3;

[0027] Figure label:

[0028] 1. Inner tube; 2. Outer tube; 3. Balloon; 31. Fixation part; 32. Dilation part; 33. Tail end; 34. Separating ring; 4. Blood vessel; 5. Braided mesh; 51. Fiber band; 52. Fixation band; 6. Imaging marker. Detailed Implementation

[0029] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0030] Atherosclerosis is a major cause of coronary heart disease, cerebral infarction, and peripheral vascular disease. Atherosclerotic stenosis can occur anywhere in the blood vessels of the body, but it is more common at the opening of blood vessels.

[0031] To dilate sclerosing stenosis and alleviate the aforementioned problems, there are currently two main methods: one is to directly dilate the sclerosing stenosis using a balloon dilatation catheter, and the other is to use a stent to dilate the stenosis with the support of the stent. Using a balloon dilatation catheter dilates the narrowed area to restore the vessel size; however, if aortic dissection or recoil occurs, a stent needs to be implanted using a balloon dilatation catheter to support the vessel.

[0032] Balloon dilation catheters mainly consist of a balloon section. Whether used alone or in conjunction with a stent, the balloon expands to support narrowed areas or increase in diameter. However, during balloon inflation, the dilated stent forms a unique funnel-shaped structure, conforming to the anatomy of the vertebral artery opening, allowing the stent to adhere tightly to the vessel wall. As the funnel-shaped balloon expands, a reaction force is generated to move the balloon proximally in order for the stent to conform to the vertebral opening. This can cause the balloon section to shift in position. Furthermore, since there are no constraints on the outer surface of the balloon section during inflation, there is a risk that the balloon may rupture the vessel.

[0033] This utility model provides a balloon 3 dilation catheter for the opening of a blood vessel 4, including an inner tube 1, an outer tube 2 sleeved on the outer peripheral surface of the inner tube 1, and a balloon 3. The balloon 3 includes a fixing part 31, an expansion part 32, and a tail end 33; the fixing part 31, the expansion part 32, and the tail end 33 are separated by a partition ring 34.

[0034] The expansion portion 32 is located between the fixing portion 31 and the tail end portion 33. Both the fixing portion 31 and the expansion portion 32 are cylindrical, and a woven mesh 5 is fitted on the outer peripheral surface of the expansion portion 32, covering more than half of the outer peripheral surface area of ​​the expansion portion 32.

[0035] Compared with the prior art, in this utility model, the balloon 3 is divided into three parts, including a fixing part 31, an expansion part 32 and a tail end 33. The tail end 33 is engaged with the opening of the blood vessel 4. The expansion part 32 is fixed by the fixing part 31 and the tail end 33 to prevent the expansion part 32 from moving and improve stability. A woven mesh 5 is provided on the outer peripheral surface of the expansion part 32. After expansion, it forms a occipital protrusion, which reduces the contact area between the expansion part 32 and the inner wall of the blood vessel 4, prevents excessive expansion, damages the inner wall of the blood vessel 4, and improves safety.

[0036] Specifically, a woven mesh 5 is fitted onto the outer peripheral surface of the expansion portion 32, and the woven mesh 5 covers more than half of the area of ​​the outer peripheral surface of the expansion portion 32.

[0037] It should be noted that in this invention, when the sclerotic stenosis area is distributed circumferentially and its area is greater than half, the expansion portion 32 can be used independently without the need for the braided mesh 5. When the sclerotic stenosis area is less than half, the braided mesh 5 needs to be fitted onto the outer circumferential surface of the expansion portion 32 to prevent excessive expansion of the expansion portion 32, protect the blood vessels 4 that have not undergone sclerotic stenosis, and improve safety.

[0038] The woven mesh 5 is a semi-cylindrical structure, formed by cutting a complete cylinder in half along its axial direction. It has a semi-circular cross-section and a planar open end. Viewed from the side, it is half a rectangle; viewed from the open end, it is a semi-circle. Both ends of the woven mesh 5 are fixed to the separating rings 34. When the expansion portion 32 expands, a part of the expansion portion 32 abuts against the inner wall of the woven mesh 5, restricting its further expansion; as the expansion portion 32 continues to expand, it continues to expand from the opening of the woven mesh 5, expanding the hardened narrow area.

[0039] Furthermore, the braided mesh 5 can rotate around the central axis of the expansion section 32, which can change the restrictive direction of the braided mesh 5 and does not hinder the expansion section 32 from expanding the hardened narrow area.

[0040] Specifically, the tail end 33 of the balloon 3 is sealed to the outer tube 2, and the fixing part 31 of the balloon 3 is sealed to the inner tube 1, forming a closed space.

[0041] It should be noted that one end of the balloon 3 in the balloon dilation catheter is sealed to the outer tube 2, and the other end of the balloon 3 is sealed to the inner tube 1. That is, the tail end 33 of the balloon 3 is sealed to the outer tube 2, and the fixing part 31 of the balloon 3 is sealed to the inner tube 1. Therefore, the balloon 3 is a closed space. The balloon 3 expands and contracts by increasing or decreasing the pressure.

[0042] In this invention, the inner tube 1 primarily serves a guiding function, enabling the outer tube 2 and balloon 3 to move within the blood vessel 4. Both the balloon 3 and the outer tube 2 are fitted onto the inner tube 1, and the balloon 3 is connected to the outer tube 2. Increasing pressure through the outer tube 2 causes the balloon 3 to inflate, thus dilating the sclerotic stenosis. Furthermore, the expansion of the balloon 3 causes the stent to extend, providing support to the sclerotic stenosis.

[0043] Specifically, the fixing part 31, the expansion part 32 and the tail end part 33 are separated by a partition ring 34.

[0044] It should be noted that in this invention, the balloon 3 is divided into three parts by the partition ring 34: the fixing part 31, the expansion part 32, and the tail end part 33. When the balloon 3 expands, the partition ring 34 does not change its own state, and it presents a shape with a high center on both sides. Moreover, the partition ring 34 has a certain limiting effect on the fixing part 31, the expansion part 32, and the tail end part 33.

[0045] Furthermore, after the separation by the separating ring 34, the length of the fixing part 31 is less than the length of the tail end 33, and the length of the tail end 33 is less than the length of the expanding part 32. The length of the expanding part 32 is much greater than the lengths of the fixing part 31 and the tail end 33. When the expanding part 32 expands, on the one hand, it can better expand the sclerotic stenosis portion and completely cover the sclerotic stenosis area; on the other hand, the length of the expanding part 32 is also much greater than the sclerotic stenosis area, so after expansion, it can better distribute the pressure and prevent the expanding part 32 from excessively compressing the blood vessel 4 and the sclerotic stenosis area, thus preventing rupture.

[0046] In one possible design, the woven mesh 5 is composed of uniformly distributed annular fiber bands 51, and the annular fiber bands 51 are connected to each other by a plurality of fixing bands 52; when the balloon 3 inflates, it forms a occipital protrusion, the direction of which is away from and perpendicular to the central axis of the fixing part 31.

[0047] It should be noted that in this utility model, the annular fiber strips 51 are evenly distributed along the length direction of the fixing part 31, and there is a certain distance between the annular fiber strips 51. The annular fiber strips 51 at both ends are fixed to the fixing part 31. Moreover, the annular fiber strips 51 are connected by multiple fixing strips 52 (the number of fixing strips 52 can be 2, 3 or more) to form an integral woven net 5.

[0048] Most importantly, a hollow space is formed between the annular fiber band 51 and the fixing band 52. When the fixing part 31 is stamped and expanded, on the one hand, the woven mesh 5 does not expand with the volume change of the fixing part 31 and limits the fixing part 31 to prevent it from over-expanding and damaging the blood vessel 4; on the other hand, the fixing part 31 continues to expand from the hollow space to form a occipital protrusion until it abuts against the inner wall of the blood vessel 4 and has an interference fit with the inner tube 1 of the blood vessel 4, thereby fixing the tail end 33 and the expansion part 32 to ensure its stability.

[0049] In one possible design, the woven mesh 5 is composed of annular fiber strips 51 and semi-annular fiber strips 51, with the semi-annular fiber strips 51 spaced apart and distributed opposite each other, and the fiber strips 51 are connected to each other by a fixing strap 52.

[0050] It should be noted that in this invention, the annular fiber bands 51 and the semi-circular fiber bands are evenly arranged along the length of the balloon or the fixing part, while the semi-annular fiber bands 51 are spaced apart and relatively distributed. When the balloon expands, a occipital protrusion is formed, and the directions of each two adjacent occipital protrusions are opposite.

[0051] A hollow space is also formed between the annular fiber band 51 and the semi-annular fiber band 51. When the fixing part 31 expands, it continues to expand from the hollow space to form an occipital protrusion until it abuts against the inner wall of the blood vessel 4. The directions of each pair of adjacent occipital protrusions are also opposite.

[0052] In one possible design, the annular fiber band 51 is a truncated ring with a smaller top and a larger bottom. The smaller cross section of the truncated ring faces the expansion portion 32. When the balloon 3 expands, it forms a occipital protrusion. The direction of the occipital protrusion is away from the central axis of the fixing portion 31 and forms an acute angle with the fixing portion 31.

[0053] Preferably, the angle between the direction of the occipital protrusion and the fixing part 31 is 30-60°.

[0054] It should be noted that in this utility model, the annular fiber strips 51 are evenly distributed along the length direction of the fixing part 31, and there is a certain distance between the annular fiber strips 51. The annular fiber strips 51 at both ends are fixed to the fixing part 31. Moreover, the annular fiber strips 51 are connected by multiple fixing strips 52 (the number of fixing strips 52 can be 2, 3 or more) to form an integral woven net 5.

[0055] Most importantly, the annular fiber band 51 is shaped like a truncated ring, with the smaller cross-section of the truncated ring facing the expansion portion 32, and a hollow space is formed between the annular fiber band 51 and the fixing band 52. When the fixing portion 31 is stamped and expanded, on the one hand, the woven mesh 5 does not expand with the volume change of the fixing portion 31, and limits the fixing portion 31 to prevent it from over-expanding and damaging the blood vessel 4; on the other hand, the fixing portion 31 continues to expand from the hollow space to form a occipital protrusion. The direction of the occipital protrusion is away from the central axis of the fixing portion 31 and forms an acute angle with the fixing portion 31 (the angle is adjustable, preferably 30-60°, for example 31°, 35°, 38°, 40°, 43°, 47°, 55° or 60°) until it abuts against the inner wall of the blood vessel 4 and forms an interference fit with the inner tube 1 of the blood vessel 4, thereby fixing the tail end 33 and the expansion portion 32 and ensuring its stability.

[0056] Specifically, the thickness of the expansion portion 32 is greater than the thickness of the tail end portion 33, and the thickness of the tail end portion 33 is greater than the thickness of the fixing portion 31.

[0057] It should be noted that in this invention, the thicknesses of the fixing part 31, the dilating part 32, and the tail end 33 of the balloon 3 are different, and in order from thinnest to thickest, they are the fixing part 31, the tail end 33, and the dilating part 32. After pressure is introduced, the balloon 3 inflates as a whole. The fixing part 31 inflates first, forming a occipital protrusion that firmly fixes the dilating part 32 and the tail end 33, preventing the tail end 33 from generating a reaction force that moves proximally during inflatation, thus improving stability. With continued pressure increase, the tail end 33 inflates next, fixed at the opening. The diameter of the tail end 33 is slightly larger than the diameter of the blood vessel 4. After dilation, the tail end 33 prevents the balloon 3 dilation catheter from moving towards the fixing part 31. With continued pressure increase, the dilating part 32 inflates last, dilating the sclerotic stenosis area.

[0058] Specifically, the woven mesh 5 is made of polymer materials, including polypropylene, PLLA, PEEK, PI, aramid, polyester fiber, aromatic polyester, carbon fiber and aliphatic polyamide.

[0059] Specifically, the woven mesh 5 is made of metal, including 304 stainless steel, 316 stainless steel and cobalt-chromium alloy.

[0060] Specifically, multiple developing marks 6 are provided on the inner tube 1, and the distance between the developing marks 6 is greater than or equal to the length of the expansion section 32.

[0061] It should be noted that in this invention, the number of imaging markers 6 is at least two. In order to identify the starting and ending positions of the dilation portion 32 within the blood vessel 4, the distance between the imaging markers 6 is greater than or equal to the length of the dilation portion 32. When the number of imaging markers 6 is three or more, the distance between the two outermost imaging markers 6 is greater than or equal to the length of the dilation portion 32.

[0062] To more clearly describe this utility model, the following embodiments and comparative examples are provided for further illustration.

[0063] Example 1

[0064] This embodiment provides a balloon dilation catheter (refer to) for use at the opening of a blood vessel (4). Figure 1-4 The device includes an inner tube 1, an outer tube 2 sleeved on the outer circumference of the inner tube 1, and a balloon 3. The balloon 3 includes a fixing part 31, an expansion part 32, and a tail end 33. The tail end 33 of the balloon 3 is sealed to the outer tube 2, and the fixing part 31 of the balloon 3 is sealed to the inner tube 1, forming a closed space.

[0065] The expansion portion 32 is located between the fixing portion 31 and the tail end portion 33, and the fixing portion 31, the expansion portion 32 and the tail end portion 33 are separated by a partition ring 34. The thickness of the expansion portion 32 is greater than the thickness of the tail end portion 33, and the thickness of the tail end portion 33 is greater than the thickness of the fixing portion 31. Both the fixing portion 31 and the expansion portion 32 are cylindrical, and a woven mesh 5 is sleeved on the outer peripheral surface of the fixing portion 31. The tail end portion 33 is trumpet-shaped, with its opening facing the expansion portion 32.

[0066] A woven mesh 5 is fitted onto the outer peripheral surface of the expansion portion 32, and the woven mesh 5 covers more than half of the area of ​​the outer peripheral surface of the expansion portion 32.

[0067] The woven mesh 5 is a semi-cylindrical structure, formed by cutting a complete cylinder in half along its axial direction. It has a semi-circular cross-section and a planar open end. Viewed from the side, it is half a rectangle; viewed from the open end, it is a semi-circle. Both ends of the woven mesh 5 are fixed to the separating rings 34. When the expansion portion 32 expands, a part of the expansion portion 32 abuts against the inner wall of the woven mesh 5, restricting its further expansion; as the expansion portion 32 continues to expand, it continues to expand from the opening of the woven mesh 5, expanding the hardened narrow area.

[0068] A woven mesh 5 is fitted onto the outer peripheral surface of the fixing part 31. The woven mesh 5 is composed of evenly distributed annular fiber bands 51, and the annular fiber bands 51 are connected to each other by multiple fixing bands 52. When the balloon 3 inflates, a occipital protrusion is formed. The direction of the occipital protrusion is away from and perpendicular to the central axis of the fixing part 31. Both the annular fiber bands 51 and the fixing bands 52 are woven from fiber filaments, and the fiber filaments can be medical polymer materials, such as polypropylene.

[0069] There are two developing marks 6, and the distance between the developing marks 6 is equal to the length of the expansion section 32;

[0070] During dilation or use, the balloon 3 of this invention expands in different sequences. First, guided by the inner tube 1, the tail end 33 of the balloon 3 is placed at the opening of the blood vessel 4. After pressure is applied, the entire balloon 3 expands. The fixing part 31 expands first, forming a occipital protrusion that firmly fixes the dilating part 32 and the tail end 33, preventing the tail end 33 from generating a reaction force that moves proximally during expansion and improving stability. As pressure continues to increase, the tail end 33 expands next, fixed at the opening. The diameter of the tail end 33 is slightly larger than the diameter of the blood vessel 4. After expansion, the tail end 33 prevents the balloon 3 dilation catheter from moving towards the fixing part 31. As pressure continues to increase, the dilating part 32 expands last, dilating the sclerotic stenosis area.

[0071] Example 2

[0072] The preparation process of Example 2 is largely the same as that of Example 1, except that in Example 2, a woven mesh 5 is fitted onto the outer peripheral surface of the fixing part 31 (see reference). Figure 5 The woven mesh 5 is composed of annular fiber strips 51 and semi-annular fiber strips 51. The semi-annular fiber strips 51 are spaced apart and relatively distributed, and the fiber strips 51 are connected to each other by a fixing belt 52.

[0073] In this embodiment, the annular fiber bands 51 and the semi-circular fiber bands are evenly arranged along the length of the balloon or the fixing part, while the semi-annular fiber bands 51 are spaced apart and relatively distributed. When the balloon expands, a occipital protrusion is formed, and the directions of each two adjacent occipital protrusions are opposite.

[0074] Example 3

[0075] The preparation process of Example 3 is largely the same as that of Example 1, except that in Example 3, a woven mesh 5 is fitted onto the outer peripheral surface of the fixing part 31 (see reference). Figure 6 The annular fiber band 51 is a truncated ring with a smaller top and a larger bottom. The smaller cross section of the truncated ring faces the expansion part 32. When the balloon 3 expands, it forms a occipital protrusion. The direction of the occipital protrusion is away from the central axis of the fixing part 31 and forms an acute angle with the fixing part 31.

[0076] The annular fiber band 51 is shaped like a truncated ring, with the smaller cross-section of the truncated ring facing the expansion portion 32, and a hollow space is formed between the annular fiber band 51 and the fixing band 52. When the fixing portion 31 is stamped and expanded, on the one hand, the woven mesh 5 does not expand with the volume change of the fixing portion 31, and limits the fixing portion 31 to prevent it from over-expanding and damaging the blood vessel 4; on the other hand, the fixing portion 31 continues to expand from the hollow space to form a occipital protrusion. The direction of the occipital protrusion is away from the central axis of the fixing portion 31 and forms an acute angle with the fixing portion 31 until it abuts against the inner wall of the blood vessel 4 and forms an interference fit with the inner tube 1 of the blood vessel 4, thereby fixing the tail end 33 and the expansion portion 32 to ensure its stability.

[0077] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. An inflatable balloon, characterized in that, The balloon (3) includes a fixing part (31), an expansion part (32) and a tail end (33); the fixing part (31), the expansion part (32) and the tail end (33) are separated by a partition ring (34); The expansion portion (32) is located between the fixing portion (31) and the tail end portion (33). Both the fixing portion (31) and the expansion portion (32) are cylindrical, and a woven mesh (5) is provided on the outer peripheral surface of the expansion portion (32). The woven mesh (5) covers more than half of the outer peripheral surface area of ​​the expansion portion (32).

2. The dilatation balloon according to claim 1, characterized in that, The woven mesh (5) has a semi-cylindrical structure, and both ends of the woven mesh (5) are fixed to the separator ring (34).

3. The dilatation balloon according to claim 2, characterized in that, The woven mesh (5) can rotate around the central axis of the expansion section (32) to change the restricted direction of the woven mesh (5).

4. The dilatation balloon according to claim 1, characterized in that, The fixed part (31), the expansion part (32) and the tail end (33) of the balloon (3) have different thicknesses, and in order from thinnest to thickest, they are the fixed part (31), the tail end (33) and the expansion part (32).

5. The dilatation balloon according to claim 1, characterized in that, A woven mesh (5) is fitted on the outer peripheral surface of the fixing part (31). The woven mesh (5) is composed of uniformly distributed annular fiber bands (51), and the annular fiber bands (51) are connected to each other by multiple fixing bands (52). When the balloon (3) inflates, a occipital protrusion is formed. The direction of the occipital protrusion is away from and perpendicular to the central axis of the fixing part (31).

6. The dilatation balloon according to claim 5, characterized in that, The woven mesh (5) is composed of annular fiber strips (51) and semi-annular fiber strips (51), with the semi-annular fiber strips (51) being distributed at intervals and connected to each other by a fixing strip (52).

7. The dilatation balloon according to claim 1, characterized in that, Multiple development marks (6) are provided on the inner tube (1), and the distance between the development marks (6) is greater than or equal to the length of the expansion section (32).

8. The dilatation balloon according to claim 1, characterized in that, The tail end (33) of the balloon (3) is sealed to the outer tube (2), and the fixing part (31) of the balloon (3) is sealed to the inner tube (1), forming a closed space.

9. The dilatation balloon according to claim 1, characterized in that, The woven mesh (5) is made of polymer materials, including polypropylene, PLLA, PEEK, PI, aramid, polyester fiber, aromatic polyester, carbon fiber and aliphatic polyamide.

10. The dilatation balloon according to claim 1, characterized in that, The woven mesh (5) is made of metal, including 304 stainless steel, 316 stainless steel and cobalt-chromium alloy.

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