Shaping system for large size balloons and method thereof

Abstract

The application provides a forming system and method of a large-size balloon with uniform wall thickness and high production efficiency, which can complete various processes of balloon forming on the same device to improve production efficiency; meanwhile, the balloon forming mold is heated or cooled by a water jacket, and the temperature is uniform and stable. A small-diameter pipe material is first blow molded into a medium-diameter balloon at low temperature, and then the medium-diameter balloon is blow molded into a large-size balloon by increasing the temperature. Through two-stage blow molding, the forming rate of the large-size balloon is improved, and after two stretching processes, the wall thickness of the large-size balloon after forming is uniform, and the performance is stable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a forming system of a large-size balloon. BACKGROUND

[0002] IABP (Intra-Aortic Balloon Pump) is a treatment method that a balloon is inserted into the descending aorta and the renal artery through femoral artery puncture method, driven and controlled by an IABP pump, inflated at the beginning of diastole, and deflated at the end of diastole, so as to increase coronary perfusion and reduce the load of the heart. As an important component of the IABP balloon catheter, the performance of the balloon directly determines the performance of the IABP balloon catheter.

[0003] The patent for the invention entitled "Medical balloon forming machine" (authorized announcement number: CN105150511B) provides a balloon forming device and a method for forming a balloon using the device. However, in the above-mentioned scheme, the balloon heating device uses a heating nozzle, and the balloon cooling device uses a cold air pipe. The two are independent of each other, and the cold air pipe directly blows air at one part of the balloon forming mold. The cooling efficiency is low and the cooling is uneven. SUMMARY

[0004] An object of the present application is to provide a forming system of a large-size balloon with uniform wall thickness and high production efficiency.

[0005] In order to achieve the above-mentioned object, the technical scheme adopted by the present application is as follows: a forming system of a large-size balloon, comprising a balloon forming mold, first and second stretching mechanisms arranged on both sides of the balloon forming mold, a pipe material with one end sealed and the other end communicated with a gas source, a heating and cooling unit arranged on the outer periphery of the balloon forming mold, the heating and cooling unit comprising a water jacket and a heating ring, the water jacket being arranged on the outer periphery of the middle part of the balloon forming mold, and the heating ring being arranged on the outer periphery of the end part of the balloon forming mold, a circulating water tank being used to control the heating / cooling of the middle part by the water jacket and the heating of the end part by the heating ring.

[0006] The balloon forming mold, the water jacket and the heating sleeve are coaxially arranged.

[0007] The water jacket is a cylindrical double-layer quartz tube, the hollow cavity of the quartz tube forms a water passing cavity, the two ends of the quartz tube are connected with the circulating water tank through water inlet pipes and water return pipes, and a temperature sensor is further arranged on the quartz tube to monitor the temperature of the quartz tube in real time and communicate with the circulating water tank.

[0008] The balloon forming mold comprises a core mold for forming a straight section of the balloon, end molds arranged at both ends of the core mold for forming a tapered shoulder of the balloon, the water jacket is arranged on the outer periphery of the core mold, and the heating ring is arranged on the outer periphery of the end mold.

[0009] The first stretching mechanism comprises a first sliding seat for supporting the end of the balloon forming die, the first sliding seat is in sliding fit with the guide rail, the length direction of the guide rail is parallel to the axis of the balloon forming die, the first sliding seat is provided with a first fixing clamp for clamping the heating ring, and an air source connector is fixed on the first sliding seat, one end of the air source connector is communicated with the pipe material, and the other end is communicated with the air tank through an air pipe, and a on-off switch is further arranged on the air pipe.

[0010] The second stretching mechanism comprises a second sliding seat for supporting the end of the balloon forming die, the second sliding seat is in sliding fit with the guide rail, the second sliding seat is provided with a second fixing clamp for clamping the heating ring, and a closed connector is arranged on the second sliding seat.

[0011] A supporting block for supporting the middle part of the balloon forming die is arranged at the middle position of the guide rail.

[0012] In the above scheme, each process of balloon forming can be completed on the same device, and the production efficiency is improved; meanwhile, the balloon forming die is heated or cooled by the water jacket, the temperature is uniform and stable, the wall thickness of the formed balloon is uniform, and the performance is stable.

[0013] Another object of the present application is a forming method of a large-size balloon with uniform wall thickness and good performance consistency.

[0014] In order to achieve the above object, the technical scheme adopted by the present application is as follows: a forming method of a large-size balloon, comprising the following steps:

[0015] A) passing the pipe material through the balloon forming die, placing the balloon forming die in the quartz tube, connecting one end of the pipe material to the second sliding seat seal, and connecting the other end to the air pipe connector of the second sliding seat;

[0016] B) starting the motion controller, the motion controller controls the first and second sliding seats to move to both sides along the guide rail, so that the pipe material remains in a stretched state;

[0017] C) starting the heating and cooling unit, after the temperature in the inner cavity of the quartz tube reaches the set temperature, starting the pressurizing device, adjusting the parameters, continuously pressurizing the pipe material, and synchronously starting the motion controller to pull the pipe material to move axially;

[0018] D) when the pipe material expands along the inner wall of the quartz tube to the ends and adheres to the inner wall of the end die, the motion controller is paused;

[0019] E) starting the circulating water tank to heat the shoulder parts of the pipe material to the set temperature, and then closing the circulating water tank and the pressurizing device;

[0020] F) opening the balloon forming die and taking out the large-size balloon.

[0021] In step C), the at least two stage blow molding, and the second blow molding temperature is higher than the first blow molding temperature.

[0022] In step E), after the shoulder of the tube is heated and shaped, the circulating water tank controls the circulating water to enter the quartz tube to cool and shape the middle flat section of the large size balloon.

[0023] In the above scheme, the small diameter tube is blow molded into a middle diameter balloon at low temperature, and then the temperature is increased to blow mold the middle diameter balloon into a large size balloon. Through the two stage blow molding, the forming rate of the large size balloon is improved, and through the two stretching, the wall thickness of the formed large size balloon is uniform and the performance is stable. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structure diagram of a large size balloon forming system;

[0025] Figure 2 It is a structure diagram of a balloon forming mold. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with examples. All other examples obtained by those skilled in the art without creative labor based on the examples in the present application belong to the protection scope of the present application.

[0027] As shown in Figure 1 A large size balloon forming system includes a balloon forming mold 10, first and second stretching mechanisms 20 and 30 arranged on both sides of the balloon forming mold 10, a tube A with one end sealed and the other end connected to a gas source, a heating and cooling unit 40 arranged around the balloon forming mold 10, the heating and cooling unit 40 including a water jacket 41 and a heating ring 42, the water jacket 41 arranged around the middle part of the balloon forming mold 10, the heating ring 42 arranged around the end part of the balloon forming mold 10, a circulating water tank 46 controlling the heating / cooling of the middle part by the water jacket 41, and the circulating water tank 46 controlling the heating of the end part by the heating ring 42. By circulating liquid with different temperatures into the water jacket 41, the balloon forming mold 10 can be heated or cooled. The end part of the balloon forming mold 10 can be heated by the heating ring 42 while the middle part of the balloon forming mold 10 is cooled, so that each process of the balloon forming is completed on the same device, improving the production efficiency. At the same time, the balloon forming mold 10 is heated or cooled by the water jacket 41, which is more uniform, and the wall thickness of the formed balloon is uniform and the performance is stable.

[0028] In order to ensure the uniformity of the heating, the balloon forming die 10, the water jacket 41 and the heating ring 42 are coaxially arranged, so that the heat of the water jacket 41 and the heating ring 22 can be uniformly transmitted to the peripheral surface of the quartz tube 10, thereby ensuring the uniformity of the heating of the balloon blank A, so that the subsequent expansion can be stable, and the obtained balloon has uniform wall thickness and stable performance.

[0029] The water jacket 41 is a cylindrical double-layer structure quartz tube, the hollow cavity of the quartz tube forms a water passing cavity, the two ends of the quartz tube are connected with the circulating water tank 46 through the water inlet pipe 44 and the water return pipe 45 respectively, and the temperature sensor 47 is further arranged on the quartz tube, which monitors the temperature of the quartz tube in real time and communicates with the circulating water tank 46. The circulating water tank 46 sets the heating parameters, controls the heating of the heating ring 22 through the temperature sensor 47, adjusts the power of the heating ring 22 according to the temperature feedback, makes the temperature of the heating area fluctuate in the normal range, and ensures the temperature stability of the heating area.

[0030] As shown in Figure 2 The balloon forming die 10 includes a core die 11 for forming the straight section of the balloon, the two ends of the core die 11 are provided with end dies 12 for forming the tapered shoulder of the balloon, the water jacket 41 is sleeved on the outer periphery of the core die 11, and the heating ring 42 is sleeved on the outer periphery of the end die 12. Since in the process of overall forming, the middle straight section has been stretched in place, but the wall thickness of the tapered shoulder at both ends is relatively thick, and after cooling and setting, it will partially retract, so the tapered shoulder needs to be stretched again, but at the same time, it is hoped that the middle straight section will not be stretched, therefore, the heating ring 42 is sleeved on the outer periphery of the end die 12, so that the mold of the specific area can be heated alone in the shoulder forming stage, thereby realizing the stretching of the tapered shoulder while not stretching the middle straight section.

[0031] The first stretching mechanism 20 comprises a first sliding seat 21 for supporting the end of the balloon forming die 10, the first sliding seat 21 being in sliding cooperation with a guide rail 22, the length direction of the guide rail 22 being parallel to the axis of the balloon forming die 10, the first sliding seat 21 being provided with a first fixing clamp 23 for clamping the heating ring 42, and an air supply connector being fixed on the first sliding seat 21, one end of the air supply connector being communicated with the pipe A and the other end being communicated with a gas storage tank 25 through an air pipe 24, and a switch 26 being further provided on the air pipe 24. The second stretching mechanism 30 comprises a second sliding seat 31 for supporting the end of the balloon forming die 10, the second sliding seat 31 being in sliding cooperation with the guide rail 22, the second sliding seat 31 being provided with a second fixing clamp 23 for clamping the heating ring 42, and a closed connector being provided on the second sliding seat 31. Here, one end of the pipe A is closed and the other end is communicated with gas, or both ends can be communicated with gas. The pipe A is communicated with gas in the straightened state, the to-be-formed section of the pipe A is blow molded and expanded, the first stretching mechanism 20 and the second stretching mechanism 30 continue to move to the two sides, and preferably the two stretching mechanisms stretch the two ends of the pipe A at the same speed and with the same force, so as to improve the uniformity of the wall thickness of the formed balloon.

[0032] In order to further ensure the stability of the balloon forming die 10, a supporting block 27 for supporting the middle part of the balloon forming die 10 is arranged at the middle position of the guide rail 22, the supporting block 27 being used for fixing the balloon forming die 10 and ensuring that the balloon forming die 10 is coaxial with the water jacket 41 and the heating sleeve 42.

[0033] A forming method of a large-size balloon, comprising the following steps:

[0034] A) The pipe A is passed through the balloon forming die 10, the balloon forming die 10 is placed in a quartz tube, one end of the pipe A is connected to the second sliding seat 31 for sealing, and the other end is communicated with the air pipe connector of the second sliding seat 31.

[0035] B) The motion controller 50 is started, the first and second sliding seats 21, 31 are controlled to move to the two sides along the guide rail 22, so that the pipe A is kept in the stretched state; in this state, the pipe is heated, cooled and the like, and the uniformity is good.

[0036] C) The circulating water tank 46 is started, after the temperature of the inner cavity of the quartz tube reaches the set temperature, the pressurizing device is started, the parameters are adjusted, the pipe A is continuously pressurized, and the motion controller 50 is started to pull the axial movement of the pipe A at the same time; the first and second sliding seats 21, 31 move synchronously, so that the forces on the two ends of the pipe A are the same, thereby ensuring that the wall thickness of the formed balloon is uniform and the performance is stable.

[0037] D) When the tube A expands along the inner wall of the quartz tube to the ends and adheres to the inner wall of the end mold 12, the motion controller 50 is paused; this indicates that the first stretching is in place, but after cooling and setting, there will be partial shrinkage, so step E) is still needed.

[0038] E) After the circulating water tank 46 controls the heating ring 42 to heat the shoulder of the tube A to the set temperature, the circulating water tank 46 and the pressurizing device are closed; because during the overall forming process, the middle straight section has been stretched to the right position, but the wall thickness of the tapered shoulder at both ends is thicker, and after cooling and setting, it will partially shrink, so the tapered shoulder needs to be stretched again.

[0039] F) Open the balloon forming mold 10 and take out the large-size balloon.

[0040] In order to improve the forming rate of the balloon, at least two stage blow molding is performed in step C), and the temperature of the second blow molding is higher than that of the first blow molding. That is, the small-diameter tube is first blow molded into a medium-diameter balloon at low temperature, and then the temperature is increased to blow mold the medium-diameter balloon into a large-size balloon. Through two-stage blow molding, the forming rate of the large-size balloon is improved, and after two stretches, the wall thickness of the large-size balloon after forming is uniform and the performance is stable.

[0041] While the tapered shoulder is stretched again, it is desired that the middle straight section is not stretched, so after the shoulder of the tube A is heated and set in step E), the circulating water tank 46 controls the cooling circulating water to enter the quartz tube to cool and set the middle straight section of the large-size balloon, thereby improving the stability of the finished product.

[0042] Those skilled in the art should understand that the above description is only some specific embodiments of the present application, not all embodiments. It should be noted that many modifications and improvements can be made by those of ordinary skill in the art, and all modifications and improvements that do not exceed the scope of the claims should be considered as the protection scope of the present application.

Claims

1. A forming system of a large-size balloon, comprising a balloon forming die (10), first and second stretching mechanisms (20, 30) arranged on both sides of the balloon forming die (10) respectively, and a tube material (A) protruding to the outside of the balloon forming die (10) and having one end sealed and the other end communicated with a gas source, characterized in that: The balloon forming die (10) is peripherally sleeved with a heating and cooling unit (40), the heating and cooling unit (40) comprises a water jacket (41) and a heating ring (42), the water jacket (41) is peripherally sleeved on the middle part of the balloon forming die (10), the heating ring (42) is peripherally sleeved on the end part of the balloon forming die (10), the balloon forming die (10) comprises a core die (11) for forming a straight section of the balloon, the two ends of the core die (11) are provided with end dies (12) for forming a tapered shoulder of the balloon, the water jacket (41) is peripherally sleeved on the core die (11), the heating ring (42) is peripherally sleeved on the end die (12), a circulating water tank (46) controls the water jacket (41) to heat / cool the middle part, and the circulating water tank (46) controls the heating ring (42) to heat the end part.

2. The forming system of a large size balloon according to claim 1, characterized in that: The balloon forming die (10), the water jacket (41) and the heating ring (42) are coaxially arranged.

3. The forming system of a large size balloon of claim 1, wherein: The water jacket (41) is a cylindrical double-layer structure quartz tube, a hollow cavity of the quartz tube forms a water passing cavity, two ends of the quartz tube are connected with the circulating water tank (46) through a water inlet pipe (44) and a water return pipe (45) respectively, and a temperature sensor (47) is further arranged on the quartz tube, the temperature sensor (47) monitors the temperature of the quartz tube in real time and communicates with the circulating water tank (46).

4. The forming system of a large size balloon of claim 1, wherein: The first stretching mechanism (20) comprises a first sliding seat (21) for supporting the end part of the balloon forming die (10), the first sliding seat (21) is in sliding cooperation with a guide rail (22), a length direction of the guide rail (22) is parallel to the axis of the balloon forming die (10), the first sliding seat (21) is provided with a first fixing clamp (23) for clamping the heating ring (42), an air source connector is fixed on the first sliding seat (21), one end of the air source connector is communicated with the pipe material (A) and the other end is communicated with a gas storage tank (25) through an air pipe (24), and a switch (26) is further arranged on the air pipe (24).

5. The forming system of a large size balloon according to claim 4, characterized by: The second stretching mechanism (30) comprises a second sliding seat (31) for supporting the end part of the balloon forming die (10), the second sliding seat (31) is in sliding cooperation with the guide rail (22), the second sliding seat (31) is provided with a second fixing clamp for clamping the heating ring (42), and a closed connector is arranged on the second sliding seat (31).

6. The forming system of a large size balloon according to claim 5, characterized by: A supporting block (27) is arranged at a middle position of the guide rail (22) for supporting the middle part of the balloon forming die (10).

7. A method of forming a large size balloon, characterized by, The method comprises the following steps: A) passing the pipe material (A) through the balloon forming die (10), placing the balloon forming die (10) into the quartz tube, connecting one end of the pipe material (A) to the second sliding seat (31) for sealing and the other end to the air pipe connector of the first sliding seat (21); B) starting a motion controller (50), the motion controller (50) controls the first and second sliding seats (21, 31) to move to both sides along the guide rail (22) to keep the pipe material (A) in a stretched state; C) starting the circulating water tank (46), after the temperature of the inner cavity of the quartz tube reaches a set temperature, starting a pressurizing device, adjusting parameters, continuously pressurizing the pipe material (A), and synchronously starting the motion controller (50) to pull the pipe material (A) to move axially. D) When the tube (A) expands along the inner wall of the quartz tube to the two ends and adheres to the inner wall of the end mold (12), the motion controller (50) is temporarily stopped; E) After the circulating water tank (46) controls the heating ring (42) to heat the shoulder of the tube (A) to the set temperature, the circulating water tank (46) controls the cooling circulating water to enter the quartz tube to cool and shape the middle straight section of the large-size balloon, and then the circulating water tank (46) and the pressurizing device are closed; F) Open the balloon forming mold (10) and take out the large-size balloon.

8. The method of forming a large size balloon of claim 7, wherein: In step C), two stage blow molding is included, and the temperature of the second blow molding is higher than that of the first blow molding.

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