A mold for balloon forming

Abstract

This utility model discloses a mold for balloon molding, comprising: a first template and a second template. The first template has a first groove with a first protrusion inside the first groove; the second template has a second groove with a second protrusion inside the second groove. When the first and second templates are closed, the first groove and the second groove constitute a molding cavity for molding the tube blank into a balloon. The length direction of the mold is defined as the X direction, and the width direction of the mold is defined as the Y direction. The angle between the first protrusion and a first parallel line parallel to the X direction is defined as the first angle α, and the range of the first angle α is 0 < α < 20°. The angle between the second protrusion and a second parallel line parallel to the X direction is defined as the second angle β, and the range of the second angle β is 0 < β < 20°. This application adopts a balloon groove structure design with integrated "Tibetan medicine-drug release" function, which significantly improves the drug reception efficiency of blood vessels at the lesion site and the stability of drug storage.

Description

Technical Field

[0001] This utility model relates to the technical field of medical molds, and in particular to a mold for balloon molding. Background Technology

[0002] Balloon catheters are one of the devices occasionally used in interventional treatment of cardiovascular and cerebrovascular diseases. They are also divided into balloon guiding catheters, balloon dilation catheters, and drug-eluting balloon catheters. For drug-eluting balloon catheters, the most important attributes they need to demonstrate are the ability to reliably store the drug before reaching the lesion and to administer sufficient medication after reaching the lesion, so as to maximize the drug delivery efficiency of the blood vessels at the lesion site.

[0003] However, in the existing technology, a high-performance drug-eluting balloon not only requires a good manufacturing process, but also a suitable mold to help shape the drug-eluting balloon, so that the basic properties of the drug-eluting balloon, such as inflation and fluid sealing, can be guaranteed, while also ensuring that the drug is reliably contained and fully released. At present, no good solution has been found for the mold suitable for the shaping of drug-eluting balloons. Utility Model Content

[0004] This invention aims to at least solve one of the aforementioned technical problems existing in the prior art. Therefore, the purpose of this invention is to provide a mold for balloon angioplasty that significantly improves drug reception efficiency in blood vessels at the lesion site and the stability of drug storage.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A first template, the first template having a first groove for balloon shaping, the first groove having a first protrusion for balloon groove shaping on the balloon; The second template has a second groove for forming a balloon, and a second protrusion for forming a balloon groove on the balloon. When the first template and the second template are closed, the first groove and the second groove form a forming cavity for forming the tube blank into a balloon. The X direction is defined along the length of the mold, the Y direction is defined along the width of the mold, and the angle between the first protrusion and the first parallel line parallel to the X direction is defined as the first angle α. The range of the first angle α is 0 < α < 20°. The angle between the second protrusion and the second parallel line parallel to the X direction is the second included angle β, and the range of the second included angle β is 0 < β < 20°.

[0006] The beneficial effects of this utility model are as follows: This application adopts a spherical groove structure design that integrates Tibetan medicine and drug release functions. First and second protrusions are respectively provided in the first and second grooves of the first and second templates. The tube blank is fed between the first and second grooves. Then, the preheated first and second templates are closed, clamping the tube blank in the forming cavity. Gas is injected into the tube blank, causing it to press against the preheated first and second protrusions at the moment of inflation and expansion, thus simultaneously extruding regular spherical grooves, effectively improving the production efficiency of the spherical tube. Simultaneously, the external gas injection volume remains constant during mold cooling. After the mold has completely cooled and solidified, a tube with specific spherical grooves is obtained. The balloon is inflated, then the inflation is stopped and the gas inside the balloon is deflated. The balloon retracts and the balloon groove contracts synchronously. By contracting the balloon groove synchronously, the opening size of the balloon groove can be reduced. This not only ensures the basic performance of the balloon in terms of inflation and fluid seal, but also allows the drug to be stored securely in the balloon groove. This effectively ensures that after the drug is placed in the balloon groove, the balloon groove expands with the balloon inflation and rapidly releases the drug, significantly improving the drug reception efficiency and drug storage stability of the blood vessel at the lesion site. In addition, the spiral structure design of the first and second protrusions helps the balloon maintain excellent flexibility and passage in curved blood vessels, thereby improving the drug reception efficiency of the blood vessel at the lesion site.

[0007] In a mold for balloon molding as described above, the first included angle α is equal to the second included angle β.

[0008] As described above, in a mold for balloon molding, along the X direction, the first groove is provided with a first conical cavity and a first circular cavity, and the two first conical cavities are arranged opposite to each other on both sides of the first circular cavity; Along the X direction, the second groove is provided with a second conical cavity and a second circular cavity, with the two second conical cavities arranged opposite each other on both sides of the second circular cavity.

[0009] As described above, in a mold for balloon molding, at least two first protrusions are equidistantly arranged along the arcuate inner wall of the first cavity along the Y direction, and at least two second protrusions are equidistantly arranged along the arcuate inner wall of the second cavity.

[0010] As described above, in a mold for balloon molding, along the X direction, the length of the first protrusion is ≤ 3 / 4 of the overall length of the tube blank, the width of the outer surface of the first protrusion away from the bottom of the first groove is ≤ 1 / 20 of the unexpanded diameter of the tube blank, and the protrusion depth of the first protrusion is ≤ 1 / 30 of the unexpanded diameter of the tube blank. Along the X direction, the length of the second protrusion is ≤ 3 / 4 of the overall length of the tube blank, the width of the outer surface of the second protrusion away from the bottom of the second groove is ≤ 1 / 20 of the unexpanded diameter of the tube blank, and the protrusion depth of the second protrusion is ≤ 1 / 30 of the unexpanded diameter of the tube blank.

[0011] As described above, in a mold for balloon molding, the cross-sections of the first protrusion and the second protrusion are one of trapezoidal, dovetail, wide-bottomed arc, or rectangular.

[0012] As described above, in a mold for forming a balloon, the bottom of the first groove is provided with a first through hole for discharging gas, and the bottom of the second groove is provided with a second through hole for discharging gas.

[0013] As described above, in a mold for balloon molding, at least two first through holes are equidistantly spaced within the first circular cavity along the X direction, and at least two second through holes are equidistantly spaced within the second circular cavity.

[0014] As described above, in a mold for balloon molding, the first template is provided with a first mounting groove and a second mounting groove along the X direction; the first mounting groove and the second mounting groove are disposed opposite to each other on both sides of the first groove and communicate with the first groove; Along the X direction, the second template is provided with a third mounting groove and a fourth mounting groove respectively; the third mounting groove and the fourth mounting groove are arranged opposite to each other on both sides of the second groove and communicate with the second groove; the first mounting groove and the second mounting groove are respectively arranged with the third mounting groove and the fourth mounting groove to form a first channel and a second channel, which are used to limit the two ends of the tube blank.

[0015] As described above, a mold for forming a balloon is provided outside the first groove for limiting the first template, and outside the second groove is provided a second connecting hole for limiting the second template. The first connecting hole and the second connecting hole are provided in a one-to-one correspondence, and a first connector is connected in the first connecting hole and the second connecting hole for limiting. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model; Figure 2 For the corresponding Figure 1 A structural diagram from another direction; Figure 3 This is an exploded view of the structure of Embodiment 1 of this utility model; Figure 4 For the corresponding Figure 3 Enlarged view of the A-section structure; Figure 5 For the corresponding Figure 3 A structural diagram from another direction; Figure 6 This is a structural cross-sectional view of Embodiment 1 of the present utility model; Figure 7 This is an exploded view of the structure of Embodiment 2 of this utility model; Figure 8 For the corresponding Figure 7 A structural diagram from another direction; Figure 9 This is an exploded view of the structure of Embodiment 3 of this utility model; Figure 10 For the corresponding Figure 9 A schematic diagram of the structure from another direction.

[0017] Reference numerals: 1-First template, 11-First groove, 111-First conical cavity, 112-First circular cavity, 12-First protrusion, 121-First parallel end, 13-First through hole, 14-First mounting groove, 15-Second mounting groove, 16-First connecting hole; 2-Second template, 21-Second groove, 211-Second conical cavity, 212-Second circular cavity, 22-Second protrusion, 221-Second parallel end, 23-Second through hole, 24-Third mounting groove, 25-Fourth mounting groove, 26-Second connecting hole; 3-Forming cavity; 4-First channel; 5-Second channel. Detailed Implementation

[0018] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0019] In the description of this application, it should be understood that if directional descriptions are involved, such as up, down, front, back, left, right, etc., indicating the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings, it is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0020] In the description of this application, if words such as several, greater than, less than, exceeding, above, below, or within appear, "several" means one or more, "more than" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the number itself, and "above," "below," "within," etc. are understood to include the number itself.

[0021] In the description of this application, the use of terms such as "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0022] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0023] Example 1: like Figures 1-6 As shown in the figure, an embodiment of the present invention provides a mold for balloon molding, comprising: A first template 1 and a second template 2 are provided. The first template 1 is provided with a first groove 11 for forming a balloon, and a first protrusion 12 for forming a balloon groove on the balloon is provided in the first groove 11. The second template 2 is provided with a second groove 21 for forming a balloon, and a second protrusion 22 for forming a balloon groove on the balloon is provided in the second groove 21. When the first template 1 and the second template 2 are closed, the first groove 11 and the second groove 21 constitute a forming cavity 3 for forming the tube blank into a balloon. The X direction is defined along the length direction of the mold, and the Y direction is defined along the width direction of the mold. The angle between the first protrusion 12 and a first parallel line parallel to the X direction is defined as the first angle α, and the range of the first angle α is 0 < α < 20°. The angle between the second protrusion 22 and a second parallel line parallel to the X direction is defined as the second angle β, and the range of the second angle β is 0 < β < 20°.

[0024] In Embodiment 1 of this utility model, the tube blank is made of an elastic material to allow it to expand smoothly after being filled with gas and contract smoothly after being discharged from the gas. A first protrusion 12 and a second protrusion 22 are respectively provided in the first groove 11 and the second groove 21 of the first mold 1 and the second mold 2. The tube blank is fed between the first groove 11 and the second groove 21. Then, the first mold 1 and the second mold 2, preheated to a preset temperature, are closed, clamping the tube blank in the forming cavity 3. Gas is then injected into the tube blank, causing it to simultaneously press against the preheated first protrusion 12 and second protrusion 22 during the instant of inflation and expansion, thus extruding regular spherical grooves. This effectively improves the production efficiency of the spherical tubes. Simultaneously, the amount of external gas injected remains constant during the mold cooling process. After the mold has completely cooled and solidified, a balloon with a specific groove is obtained. Then, the gas inflation is stopped and the gas inside the balloon is expelled. The balloon retracts and the groove contracts synchronously. Through the synchronous contraction of the groove, the opening size of the groove can be reduced. This not only ensures the basic performance of the balloon in terms of inflation and fluid sealing, but also allows the drug to be stored securely in the groove. This effectively ensures that after the drug is placed in the groove, the groove expands with the balloon and rapidly releases the drug, significantly improving the drug reception efficiency and drug storage stability of the blood vessel at the lesion site. In addition, the spiral structure design of the first protrusion 12 and the second protrusion 22 helps the balloon maintain excellent flexibility and passage in curved blood vessels, thereby improving the drug reception efficiency of the blood vessel at the lesion site.

[0025] In Embodiment 1 of this utility model, the first template 1 and the second template 2 are made of high thermal conductivity materials to ensure that heat can be quickly and evenly transferred to the entire molding cavity 3 during the preheating process, thereby ensuring uniform heating of the tube blank and improving the molding quality of the balloon.

[0026] Specifically, the first included angle α is equal to the second included angle β.

[0027] In Embodiment 1 of this utility model, the first template 1 and the second template 2 adopt a centrally symmetrical structural design. The range of the first included angle α and the second included angle β is preferably 5°-15°. The range of 5°-15° enables the first protrusion 12 and the second protrusion 22 to form balloon grooves with specific helical angles on the tube blank, which is beneficial for the balloon to maintain excellent flexibility and passability in curved blood vessels, thereby improving the drug reception efficiency of blood vessels at the lesion site.

[0028] Furthermore, along the X direction, the first groove 11 is provided with a first conical cavity 111 and a first circular cavity 112, with the two first conical cavities 111 being arranged opposite each other on both sides of the first circular cavity 112; along the X direction, the second groove 21 is provided with a second conical cavity 211 and a second circular cavity 212, with the two second conical cavities 211 being arranged opposite each other on both sides of the second circular cavity 212.

[0029] In Embodiment 1 of this utility model, the first protrusion 12 and the second protrusion 22 are respectively disposed in the first circular cavity 112 and the second circular cavity 212 to ensure that the tube blank undergoes relatively uniform radial expansion within the circular cavity segment formed by the first circular cavity 112 and the second circular cavity 212 during the inflation process. The first protrusion 12 and the second protrusion 22 compress the tube blank within the circular cavity segment, and the tube blank is mainly subjected to radial and symmetrical expansion force. This stable force state is conducive to forming grooves with consistent depth and shape, thereby improving the forming quality of the balloon.

[0030] Furthermore, along the Y direction, at least two first protrusions 12 are equidistantly arranged along the inner arc of the first circular cavity 112, and at least two second protrusions 22 are equidistantly arranged along the inner arc of the second circular cavity 212.

[0031] In Embodiment 1 of this utility model, the number of the first protrusion 12 and the second protrusion 22 is preferably 3, so as to ensure that the balloon can better store drugs and make the most of the effective area of ​​the first circular cavity 112 and the second circular cavity 212. At the same time, the structural design of the first protrusion 12 and the second protrusion 22 being equidistantly arranged along the inner wall of the arc is beneficial to improving the stability of the balloon groove.

[0032] In Embodiment 1 of this utility model, the first protrusion 12 is provided with a first parallel end 121, and the two first parallel ends 121 are arranged opposite to each other on both sides of the first protrusion 12, and the two first parallel ends 121 are arranged parallel to each other along the X direction; the second protrusion 22 is provided with a second parallel end 221, and the two second parallel ends 221 are arranged opposite to each other on both sides of the second protrusion 22, and the two second parallel ends 221 are arranged parallel to each other along the X direction, so as to minimize the frictional resistance between the first protrusion 12 and the second protrusion 22 and the tube blank, ensure that the tube blank can expand or contract smoothly during the forming process, avoid surface scratches, and improve the forming quality of the balloon.

[0033] Furthermore, along the X direction, the length of the first protrusion 12 is ≤ 3 / 4 of the overall length of the tube blank, the width of the outer surface of the first protrusion 12 away from the bottom of the first groove 11 is ≤ 1 / 20 of the unexpanded diameter of the tube blank, and the protrusion depth of the first protrusion 12 is ≤ 1 / 30 of the unexpanded diameter of the tube blank; along the X direction, the length of the second protrusion 22 is ≤ 3 / 4 of the overall length of the tube blank, the width of the outer surface of the second protrusion 22 away from the bottom of the second groove 21 is ≤ 1 / 20 of the unexpanded diameter of the tube blank, and the protrusion depth of the second protrusion 22 is ≤ 1 / 30 of the unexpanded diameter of the tube blank; this design ensures that the balloon grooves do not interfere with each other after the balloon is contracted, ensuring that the drug can be smoothly placed into the balloon groove.

[0034] Preferably, the length, outer surface width, and protrusion depth of the first protrusion 12 are the same as those of the second protrusion 22 to ensure the consistency of the balloon molding quality.

[0035] Furthermore, the cross-sections of the first protrusion 12 and the second protrusion 22 are one of trapezoidal, dovetail, wide-bottomed arc, or rectangular.

[0036] In Embodiment 1 of this utility model, the cross-sections of the first protrusion 12 and the second protrusion 22 are preferably trapezoidal with the top edge facing the opening. This is because the two inclined sides of the trapezoid form a specific angle with the balloon wall. When the pressure inside the balloon is released and it needs to retract from the inflated state, the balloon will bend along the path of least resistance, thereby shrinking the opening of the balloon groove. This ensures that the loss of the drug stored in the balloon groove can be reduced by shrinking through the opening of the balloon groove. At the same time, the cross-sections of the first protrusion 12 and the second protrusion 22 are trapezoidal, which ensures that the formed balloon groove is an inverted trapezoid. The opening of the inverted trapezoidal balloon groove will not completely close during the shrinkage process, thereby improving the efficiency of drug release and reducing the loss of drug during balloon placement.

[0037] Furthermore, the bottom of the first groove 11 is provided with a first through hole 13 for discharging gas, and the bottom of the second groove 21 is provided with a second through hole 23 for discharging gas.

[0038] In Embodiment 1 of this utility model, the first through hole 13 and the second through hole 23 are used to simultaneously discharge the gas in the forming cavity 3 during the gas filling process of the tube blank, so as to ensure that the tube blank can smoothly expand to the inner wall of the forming cavity 3 and stick to the inner wall, thereby improving the forming quality of the balloon. Furthermore, along the X direction, at least two first through holes 13 are equidistantly arranged in the first circular cavity 112, and at least two second through holes 23 are equidistantly arranged in the second circular cavity 212.

[0039] The present invention preferably has three first through holes 13 and three second through holes 23 to ensure that the gas in the forming cavity 3 can be discharged quickly, thereby improving the production efficiency of the balloon; at the same time, by having three first through holes 13 and three second through holes 23, damage to the balloon due to excessively rapid contraction during the contraction process can be prevented, effectively improving the production quality of the balloon.

[0040] It is understandable that the aperture range of the first through hole 13 and the second through hole 23 is preferably 0.1mm-0.5mm. Within this range, it can ensure the smooth discharge of gas and effectively prevent the tube blank from being squeezed into the through hole and causing blockage during the inflation and pressurization process, thereby improving the production efficiency of the balloon.

[0041] Furthermore, along the X direction, the first template 1 is provided with a first mounting groove 14 and a second mounting groove 15 respectively; the first mounting groove 14 and the second mounting groove 15 are arranged opposite to each other on both sides of the first groove 11 and are connected to the first groove 11. Along the X direction, the second template 2 is provided with a third mounting groove 24 and a fourth mounting groove 25 respectively; the third mounting groove 24 and the fourth mounting groove 25 are arranged opposite to each other on both sides of the second groove 21 and are connected to the second groove 21; the first mounting groove 14 and the second mounting groove 15 are respectively arranged with the third mounting groove 24 and the fourth mounting groove 25 to form a first channel 4 and a second channel 5, which are used to limit the two ends of the tube blank.

[0042] In Embodiment 1 of this utility model, the two ends of the tube blank are provided with inflation conduits. The first channel 4 and the second channel 5 can clamp and limit the inflation conduits at both ends of the tube blank during the mold closing process of the first template 1 and the second template 2, so as to prevent the tube blank from swinging during the inflation process and improve the molding quality of the balloon.

[0043] Furthermore, the first groove 11 is provided with a first connecting hole 16 for limiting the first template 1, and the second groove 21 is provided with a second connecting hole 26 for limiting the second template 2. The first connecting hole 16 and the second connecting hole 26 are provided in a one-to-one correspondence, and the first connector is connected in the first connecting hole 16 and the second connecting hole 26 for limiting.

[0044] In Embodiment 1 of this utility model, the first connecting member is preferably a guide rod, so as to ensure that the first template 1 and the second template 2 can slide smoothly along the guide rod during the mold closing or opening process, prevent the first template 1 and the second template 2 from being displaced during the mold closing or opening process, ensure the stability of the mold during the molding process, and thus improve the molding quality of the balloon.

[0045] Example 2: like Figure 7-8 As shown, the difference between Embodiment 2 and Embodiment 1 is that the first template 1 and the second template 2 adopt a symmetrical structural design, and the structural designs of the first protrusion 12 and the second protrusion 22 are different. In Embodiment 2 of this utility model, along the X direction, a plurality of first protrusions 12 are equidistantly arranged in a ring within the first circular cavity 112, and the first protrusions 12 are perpendicular to the parallel lines of the first template 1 along the X direction; along the X direction, a plurality of second protrusions 22 are equidistantly arranged in a ring within the second circular cavity 212, and the second protrusions 22 are perpendicular to the parallel lines of the second template 2 along the X direction. When the first template 1 and the second template 2 are closed, the first protrusions 12 and the second protrusions 22 are connected to form an annular protrusion, which can ensure that only axial alignment is required when closing the mold, without having to consider the precise alignment of the circumferential rotation angle, greatly reducing the manufacturing precision requirements and assembly difficulty of the mold, and improving production efficiency and yield.

[0046] Preferably, the number of the first protrusion 12 and the second protrusion 22 of this utility model is defined as N. Then, in embodiment 2 of this utility model, the number of the first protrusion 12 and the second protrusion 22 is in the range of 2≤N≤10, so as to ensure that the number of balloon grooves of the balloon can be flexibly adjusted as needed, thereby enhancing the flexibility of balloon use.

[0047] Example 3: like Figure 9-10 As shown, the difference between Embodiment 3 and Embodiment 1 is that the first template 1 and the second template 2 adopt an asymmetrical structural design, and the structural designs of the first protrusion 12 and the second protrusion 22 are different. In embodiment 3 of this utility model, the first protrusion 12 is parallel to the X direction, and the length of the first protrusion 12 is ≤ 2 / 3 of the overall length of the tube blank, the width of the outer surface of the first protrusion 12 away from the bottom of the first groove 11 is ≤ 1 / 20 of the unexpanded diameter of the tube blank, and the protrusion depth of the first protrusion 12 is ≤ 1 / 30 of the unexpanded diameter of the tube blank; the second protrusion 22 is parallel to the X direction, and the length of the second protrusion 22 is ≤ 2 / 3 of the overall length of the tube blank, the width of the outer surface of the second protrusion 22 away from the bottom of the second groove 21 is ≤ 1 / 20 of the unexpanded diameter of the tube blank, and the protrusion depth of the second protrusion 22 is ≤ 1 / 30 of the unexpanded diameter of the tube blank.

[0048] In embodiment 3 of this utility model, the first protrusion 12 and the second protrusion 22 are both parallel to the X direction, so that the first protrusion 12 and the second protrusion 22 can perpendicularly compress the tube blank to form the balloon groove without causing complex and uneven stretching of the material, thereby improving the forming quality of the balloon.

[0049] In embodiment 3 of this utility model, the number of first protrusions 12 is preferably two, and the number of second protrusions 22 is preferably one, so that the first through hole 13 is disposed between the two first protrusions 12, and the second through holes 23 are equidistantly arranged on the second protrusions 22, which effectively improves the smoothness of gas discharge in the forming cavity 3, thereby ensuring the integrity of the tube blank filling in the forming cavity 3, and increasing the drug storage capacity of the balloon.

[0050] Preferably, the length, outer surface width, and protrusion depth of the first protrusion 12 are the same as those of the second protrusion 22 to ensure the consistency of the balloon molding quality.

[0051] In some embodiments, the number of the first protrusion 12 and the second protrusion 22 can be increased or decreased to be customized according to specific circumstances, thereby enhancing the flexibility of mold use and increasing the drug storage capacity of the balloon.

[0052] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A mold for balloon molding, characterized in that, include: First template (1), the first template (1) is provided with a first groove (11) for balloon forming, and the first groove (11) is provided with a first protrusion (12) for forming a balloon groove on the balloon. The second template (2) is provided with a second groove (21) for forming a balloon, and a second protrusion (22) for forming a balloon groove on the balloon is provided in the second groove (21); when the first template (1) and the second template (2) are closed, the first groove (11) and the second groove (21) constitute a forming cavity (3) for forming the tube blank into a balloon. The X direction is defined along the length of the mold, and the Y direction is defined along the width of the mold. The angle between the first protrusion (12) and the first parallel line parallel to the X direction is defined as the first angle α. The range of the first angle α is 0 < α < 20°. The angle between the second protrusion (22) and the second parallel line parallel to the X direction is the second included angle β, and the range of the second included angle β is 0 < β < 20°.

2. The mold for balloon molding according to claim 1, characterized in that, The first included angle α is equal to the second included angle β.

3. The mold for balloon molding according to claim 1, characterized in that, Along the X direction, the first groove (11) is provided with a first conical cavity (111) and a first circular cavity (112), and the two first conical cavities (111) are arranged opposite to each other on both sides of the first circular cavity (112); Along the X direction, the second groove (21) is provided with a second conical cavity (211) and a second circular cavity (212), and the two second conical cavities (211) are arranged opposite to each other on both sides of the second circular cavity (212).

4. A mold for balloon molding according to claim 3, characterized in that, Along the Y direction, at least two of the first protrusions (12) are equidistantly arranged along the inner arc of the first circular cavity (112), and at least two of the second protrusions (22) are equidistantly arranged along the inner arc of the second circular cavity (212).

5. A mold for balloon molding according to claim 3, characterized in that, Along the X direction, the length of the first protrusion (12) is ≤ 3 / 4 of the overall length of the tube blank, the width of the outer surface of the first protrusion (12) away from the bottom of the first groove (11) is ≤ 1 / 20 of the unexpanded diameter of the tube blank, and the protrusion depth of the first protrusion (12) is ≤ 1 / 30 of the unexpanded diameter of the tube blank. Along the X direction, the length of the second protrusion (22) is ≤ 3 / 4 of the overall length of the tube blank, the width of the outer surface of the second protrusion (22) away from the bottom of the second groove (21) is ≤ 1 / 20 of the unexpanded diameter of the tube blank, and the protrusion depth of the second protrusion (22) is ≤ 1 / 30 of the unexpanded diameter of the tube blank.

6. A mold for balloon molding according to claim 1, characterized in that, The cross-sections of the first protrusion (12) and the second protrusion (22) are one of trapezoidal, dovetail, wide-bottomed arc, or rectangular.

7. A mold for balloon molding according to claim 3, characterized in that, The bottom of the first groove (11) is provided with a first through hole (13) for discharging gas, and the bottom of the second groove (21) is provided with a second through hole (23) for discharging gas.

8. A mold for balloon molding according to claim 7, characterized in that, Along the X direction, at least two first through holes (13) are equidistantly arranged in the first circular cavity (112), and at least two second through holes (23) are equidistantly arranged in the second circular cavity (212).

9. A mold for balloon molding according to claim 1, characterized in that, Along the X direction, the first template (1) is provided with a first mounting groove (14) and a second mounting groove (15); the first mounting groove (14) and the second mounting groove (15) are arranged opposite to each other on both sides of the first groove (11) and communicate with the first groove (11); Along the X direction, the second template (2) is provided with a third mounting groove (24) and a fourth mounting groove (25); the third mounting groove (24) and the fourth mounting groove (25) are arranged opposite to each other on both sides of the second groove (21) and communicate with the second groove (21); the first mounting groove (14) and the second mounting groove (15) are respectively arranged with the third mounting groove (24) and the fourth mounting groove (25) to form a first channel (4) and a second channel (5) for limiting the two ends of the tube blank.

10. A mold for balloon molding according to claim 1, characterized in that, The first groove (11) is provided with a first connecting hole (16) for limiting the first template (1), and the second groove (21) is provided with a second connecting hole (26) for limiting the second template (2). The first connecting hole (16) and the second connecting hole (26) are provided in a one-to-one correspondence. The first connector is connected in the first connecting hole (16) and the second connecting hole (26) for limiting.

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