Large size balloon tube pin welding method

Abstract

A large-size balloon tube foot welding method, comprising the following steps: clamping and installing the mandrel in the balloon tube foot at left and right ends respectively, and sleeving the heat shrink tube outside the balloon tube foot; fixing the mandrel in the rotating device; moving the laser probe to the corresponding position outside the balloon tube foot; circumferentially welding the balloon tube foot by the method of rotating the mandrel and the balloon tube foot by the rotating device; moving the hot melting equipment so that the melting position moves uniformly along the balloon tube foot to the head end of the balloon tube foot horizontally while the mandrel rotates to dynamically weld; taking out the mandrel from the balloon tube foot after the balloon tube foot solidifies; inserting the corresponding inner and outer tubes into the balloon tube foot, and welding the connection between the inner and outer tubes and the outermost side of the balloon tube foot by laser.

Description

Technical Field

[0001] This invention relates to the field of medical technology, and in particular to a method for welding the pins of a large-sized balloon. Background Technology

[0002] After blow molding, large-sized balloons are cut to a certain size with two tubes. Inner and outer tubes are then inserted into the left and right tubes respectively, and the connections between the tubes and the inner and outer tubes are welded. The following problems exist in the welding of the tubes of existing large-sized balloons: 1. As attached Figure 1 As shown, the wall thicknesses at the left and right ends of the large-size balloon tube are γ and &, respectively. γ and & are relatively thick. Figure 2 As shown, during welding, there is a certain step height between the balloon catheter and the outer surfaces of the inner and outer tubes. The step heights are α and β, respectively. The values ​​of α and β are relatively large, which leads to uneven welding, large outer diameter of the weld point, or the appearance of air bubbles, affecting the balloon's permeability and welding strength. This may bring the risk of weld point rupture during interventional surgery. 2. Large-size balloons generally use a 0.035” guidewire system. Compared to the inner and outer tubes of the 0.035” guidewire system, the large-size balloon has more polymer material accumulation at the tube feet, resulting in thicker and harder walls. When laser welding energy is transferred into the weld point to melt the inner and outer tubes, the tube feet are not completely melted, causing the inner and outer tubes to be burned and damaged, making it difficult to achieve the desired welding effect. Summary of the Invention

[0003] The present invention aims to solve the problems existing in the prior art by providing a method for welding the feet of a large-size balloon. This welding method can ensure uniform welding at the welding position and small weld diameter, thus ensuring the passage of the balloon and the welding strength, and ensuring the normal performance of interventional surgery. Moreover, it can ensure that the feet are completely melted during the welding process, avoiding burns and damage to the inner and outer tubes, and ensuring the welding effect.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows: This method for welding the feet of a large-size balloon includes the following steps: Step 1: Perform welding pretreatment on the balloon tube feet to make the balloon tube feet thinner and the outer end face of the balloon tube feet smoother; Step 2: Insert the corresponding inner and outer tubes into the balloon tube feet, and weld the connection between the inner and outer tubes and the outermost part of the balloon tube feet using a laser. Step one of the welding pretreatment includes the following steps: Step 1: Secure the mandrel to the balloon feet at both ends and insert heat shrink tubing onto the outside of the balloon feet; Step 2: Fix the mandrels at both ends in the rotating device; Step 3: Move the laser probe to the corresponding position on the outside of the balloon tube foot; Step 4: The rotating device drives the mandrel and balloon pins to rotate, while the laser probe is activated to perform circumferential welding on the balloon pins; Step 5: Move the laser probe so that the melting position moves horizontally and uniformly from the inside to the outside along the balloon tube foot. At the same time, the rotating device drives the balloon tube foot to rotate through the mandrel, performing dynamic welding on the balloon tube foot, so that the balloon tube foot forms a gentle slope on the outside of the mandrel. Step 6: After the balloon tube has solidified, remove the mandrel from the balloon tube.

[0005] Preferably, in the third step of the welding pretreatment, the laser probe is moved to a position 1-3 mm away from the tail end of the balloon tube.

[0006] Preferably, in the fourth step of the welding pretreatment, the laser energy is 1000-1080mW, the rotation speed of the rotating device is 200-400rpm, and the spot size of the laser probe is 2.8-3mm.

[0007] Preferably, in the fifth step of the welding pretreatment, the laser energy is 1300-1350mW, the horizontal moving speed of the laser probe is 0.13-0.17mm / s, the horizontal moving distance is 5-7mm, the rotation speed of the rotating device is 200-400rpm, and the spot size of the laser probe is 3-3.2mm.

[0008] Preferably, in the third step of the welding pretreatment, the laser probe is moved to a position 2mm away from the tail end of the balloon tube; in the fourth step of the welding pretreatment, the laser energy is 1000mW, the rotation speed of the rotating device is 300rpm, and the spot size of the laser probe is 2.8mm; in the fifth step of the welding pretreatment, the laser energy is 1300mW, the rotation speed of the rotating device is 300rpm, the horizontal moving speed of the laser probe is 0.13mm / s, the horizontal moving distance is 6mm, and the spot size of the laser probe is 3mm.

[0009] Preferably, in the third step of the welding pretreatment, the laser probe is moved to a position 2mm away from the tail end of the balloon tube; in the fourth step of the welding pretreatment, the laser energy is 1080mW, the rotation speed of the rotating device is 300rpm, and the spot size of the laser probe is 3mm; in the fifth step of the welding pretreatment, the laser energy is 1350mW, the rotation speed of the rotating device is 300rpm, the horizontal moving speed of the laser probe is 0.17mm / s, the horizontal moving distance is 6mm, and the spot size of the laser probe is 3.2mm.

[0010] Preferably, the rotating device includes a chuck travel rail, on which a support base for clamping and driving the left and right end spindles to rotate is slidably connected. A laser probe travel rail is installed on the upper end of the support base, and a laser probe that is driven by a driving device to slide horizontally is installed on the laser probe travel rail.

[0011] Preferably, the right end support includes a seat body mounted on the chuck travel track, a chuck that is driven to rotate by a drive device is mounted inside the seat body, and a spindle is clamped and connected to the inside of the chuck.

[0012] The beneficial effects of this invention are as follows: By processing the balloon tube feet into an inclined surface that approaches the weld joint through welding pretreatment, the wall thickness at the balloon tube foot connection is reduced, thereby eliminating the step at the weld point. This ensures uniform welding at the welding position, a small weld point diameter, and guarantees the passage of the balloon and welding strength, ensuring the normal progress of interventional surgery. At the same time, the thinner wall thickness at the connection ensures that the tube feet are completely melted during welding, avoiding long-term high temperature burns and damage to the inner and outer tubes. Furthermore, during welding pretreatment, the molten tube feet are extruded and extended using the heat shrink effect of heat shrink tubing to form balloon tube feet with a gentle slope. Plastic processing using heat shrink tubing maintains the same material weight of the tube feet, and the resulting tube feet have good pressure resistance, fatigue resistance, and tensile strength, ensuring the subsequent welding effect. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the balloon tube pin structure; Figure 2 This is a schematic diagram of the balloon tube ends and inner and outer tubes after assembly. Figure 3 This is a schematic diagram of the rotating device; Figure 4 This is the right view of the support base; Figure 5 This is a cross-sectional view of the support base; Figure 6 This is a schematic diagram of the balloon tube pin structure after welding pretreatment in Example 1; Figure 7 This is a schematic diagram of the balloon tube foot structure after welding pretreatment in Example 2.

[0014] Explanation of reference numerals in the attached diagram: 1. Chuck travel rail, 2. Mandrel, 3. Support base, 4. Laser probe travel rail, 5. Laser probe, 3-1. Base, 3-2. Chuck, 3-3. Motor. Specific implementation methods The present invention will be further described below with reference to the accompanying drawings: A method for welding the tube ends of a large-size balloon includes the following steps: Step 1: Perform welding pretreatment on the balloon tubes to make the balloon tubes thinner and the outer end face of the balloon tubes smoother; Step 2: Insert the corresponding inner and outer tubes into the balloon tubes, and weld the connection between the inner and outer tubes and the outermost part of the balloon tubes using a laser.

[0015] Among them, the balloon tube feet can be pre-treated for welding by methods such as melting, cutting, planing, and CNC machining. Example 1: See attached document Figure 3 , 4 5. The rotating device includes a chuck travel rail 1, on which a support base 3 is slidably connected. The support base 3 includes a seat body 3-1 slidably disposed on the chuck travel rail 1, with a mounting hole inside the seat body 3-1. The tail end of the chuck 3-2 is rotatably connected to the mounting hole via a bearing, and the tail end of the chuck 3-2 is drive-connected to a motor 3-3. Figure 5 As shown, the output shaft of motor 3-3 can be directly fixed to the inner side of the tail end of chuck 3-2. The laser probe travel track 4 is set on the upper end of support base 3. The laser probe travel track 4 is fixed on chuck travel track 1 by support rod. The laser probe 5 is installed on laser probe travel track 4 through lead screw transmission device. The lead screw is driven to rotate by stepper motor, which in turn drives lead screw slide and laser probe 5 installed on lead screw slide to move horizontally.

[0016] See attached document Figure 3 In this embodiment, a laser probe is used to emit a laser to perform a welding pretreatment of the balloon tube feet by melting. Welding pretreatment includes the following steps: Step 1: Secure the mandrel to the balloon tube feet at both ends and insert heat shrink tubing onto the outside of the balloon tube feet; Step 2: Insert the mandrels at the left and right ends into the clamps 3-2 of the support seats 3 at the left and right ends respectively, and clamp and fix the mandrels by the clamps 3-2; Step 3: Move the laser probe from the end of the balloon tube to a position 2mm away from the end of the balloon tube at a speed of 2.5mm / s, and wait for the subsequent start welding command; Step 4: Motor 3-3 starts, and the rotating device starts working. Motor 3-3 drives chuck 3-2 and the mandrel inside chuck 3-2 to rotate at a speed of 300 rpm. At the same time, the laser probe works to generate a laser spot with a power of 1080mW that acts on the welding point. The diameter of the laser spot is 3mm. The position of the laser probe is fixed. Thus, the position of the laser spot emitted by the laser probe remains unchanged. The balloon tube foot is circumferentially welded by rotating while the laser probe remains stationary. This step ensures that the balloon tube foot at the starting position is completely melted and is also for the connection of laser energy in the subsequent step 5. Step 5: The power of the laser spot generated by the laser probe is increased to 1350mW, and the diameter of the spot is increased to 3.2mm. The laser probe is moved so that the laser welding melting position moves horizontally 6mm along the balloon tube foot at a speed of 0.17mm / s towards the tip of the balloon tube foot. At the same time, the rotating device drives the balloon tube foot to rotate at a speed of 300rpm for dynamic welding. During the movement, the laser probe melts the rotating balloon tube foot. The larger spot causes the balloon tube foot to melt over a large area. At the same time, it is pressed down under the shrinkage of the heat shrink tubing. Under the action of the heat shrink tubing, the molten tube foot extends away from the balloon. The faster movement speed of the laser probe is conducive to forming a smooth and continuous conical slope on the outside of the balloon tube foot. The higher laser energy can avoid the tube foot from being pressed down without being completely melted. Step 6: After the balloon tube has solidified, remove the mandrel from the balloon tube.

[0017] See attached document Figure 6 The above-mentioned welding pretreatment method forms a continuous, gently sloping conical surface on the outside of the balloon tube, which facilitates subsequent welding and fixing with the inner and outer tubes. This eliminates the stepped surface formed after the balloon tube is assembled with the inner and outer tubes, ensuring the balloon's passability.

[0018] Example 2: Compared to Example 1, the difference lies in the fact that the welding pretreatment includes the following steps: Step 1: Secure the mandrel to the balloon tube feet at both ends and insert heat shrink tubing onto the outside of the balloon tube feet; Step 2: Insert the mandrels at the left and right ends into the clamps 3-2 of the support seats 3 at the left and right ends respectively, and clamp and fix the mandrels by the clamps 3-2; Step 3: Move the laser probe from the end of the balloon tube to a position 2mm away from the end of the balloon tube at a speed of 2.5mm / s, and wait for the subsequent start welding command; Step 4: Motor 3-3 starts, the rotating device starts working, motor 3-3 drives chuck 3-2 and the spindle inside chuck 3-2 to rotate at a speed of 300 rpm. At the same time, the laser probe works to generate a laser spot with a power of 1000mW that acts on the welding point. The diameter of the laser spot is 2.8mm. The position of the laser probe is fixed. Step 5: The power of the laser spot generated by the laser probe is changed to 1300mW, and the diameter of the spot is expanded to 3mm. The laser probe is moved so that the laser welding melting position moves horizontally 6mm along the balloon tube foot at a speed of 0.13mm / s towards the tip of the balloon tube foot. At the same time, the rotating device drives the balloon tube foot to rotate at a speed of 300rpm for dynamic welding. Compared with Example 1, the spot diameter is smaller in this example. The smaller spot allows the balloon tube foot to be pressed down more deeply. The slower moving speed allows the molten tube foot to be fully pressed down under the action of the heat shrink tubing, thereby forming a small step surface at the middle position of the balloon tube foot. The lower laser energy can prevent the tube foot from being burned and damaged. The molten tube foot is extended in the direction of the laser probe movement by the shrinking action of the heat shrink tubing, thereby becoming thinner and forming a small conical structure at the end. Step 6: After the balloon tube has solidified, remove the mandrel from the balloon tube.

[0019] See attached document Figure 7 The above-mentioned welding pretreatment method will first form a small step surface on the outside of the balloon tube foot, and then form a tapered surface with a continuous and gentle slope at the rear end of the step surface. Then, when welding with the inner and outer tubes in the future, the welding position is set at the connection between the tapered surface and the inner and outer tubes.

[0020] Example 3: The welding pretreatment method includes directly cutting the balloon tube pins on a lathe, thereby machining a tapered surface on the outside of the balloon tube pins to make the tube pins thinner and the tube pin step surface gentler.

[0021] In both Examples 1 and 2, the balloon tubes are formed into conical surfaces that facilitate welding with the inner and outer tubes through laser thermofusion. Compared to the welding pretreatment in Example 3, which is performed by cutting and removing material, the welding pretreatment in the above two examples, which involves plastic processing by melting the tubes, results in a smoother conical surface with no material loss. The tubes can be welded to the inner and outer tubes more firmly. Compared to Examples 1 and 2, the balloon tubes in Example 1 have better continuity after welding pretreatment, forming a continuous and gentle conical surface, which improves the balloon's passability during use.

[0022] Certain terms are used in the specification and claims of this invention to refer to specific products. Those skilled in the art will understand that manufacturers may use different names to refer to the same components. This document is not intended to distinguish between components that have the same function but different names. In the following specification and claims, words such as “comprising,” “having,” and “including” are open-ended terms and should therefore be interpreted as “containing but not limited to…”.

[0023] The above description is a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for welding the tube ends of a large-size balloon, comprising the following steps: Step 1: Perform welding pretreatment on the balloon tube feet to make the balloon tube feet thinner and the outer end face of the balloon tube feet smoother; Step 2: Insert the corresponding inner and outer tubes into the balloon tube feet, and weld the connection between the inner and outer tubes and the outermost part of the balloon tube feet using a laser. The welding pretreatment described in step one includes the following steps: Step 1: Secure the mandrel to the balloon feet at both ends and insert heat shrink tubing onto the outside of the balloon feet; Step 2: Fix the mandrels at both ends in the rotating device; Step 3: Move the laser probe to the corresponding position on the outside of the balloon tube foot; Step 4: The rotating device drives the mandrel and balloon pins to rotate, while the laser probe is activated to perform circumferential welding on the balloon pins; Step 5: Move the laser probe so that the melting position moves horizontally and uniformly from the inside to the outside along the balloon tube foot. At the same time, the rotating device drives the balloon tube foot to rotate through the mandrel, performing dynamic welding on the balloon tube foot, so that the balloon tube foot forms a gentle slope on the outside of the mandrel. Step 6: After the balloon tube has solidified, remove the mandrel from the balloon tube.

2. The method for welding the large-size balloon tube feet according to claim 1, characterized in that: In the third step of the welding pretreatment, the laser probe is moved to a position 1-3 mm away from the tail end of the balloon tube.

3. The method for welding the large-size balloon tube feet according to claim 2, characterized in that: In the fourth step of welding pretreatment, the laser energy is 1000-1080mW, the rotation speed of the rotating device is 200-400rpm, and the spot size of the laser probe is 2.8-3mm.

4. The method for welding the large-size balloon tube feet according to claim 3, characterized in that: In the fifth step of welding pretreatment, the laser energy is 1300-1350mW, the horizontal moving speed of the laser probe is 0.13-0.17mm / s, the horizontal moving distance is 5-7mm, the rotation speed of the rotating device is 200-400rpm, and the spot size of the laser probe is 3-3.2mm.

5. The method for welding the large-size balloon tube feet according to claim 4, characterized in that: In the third step of the welding pretreatment, the laser probe is moved to a position 2mm away from the tail end of the balloon tube; in the fourth step of the welding pretreatment, the laser energy is 1080mW, the rotation speed of the rotating device is 300rpm, and the laser probe spot size is 3mm; in the fifth step of the welding pretreatment, the laser energy is 1350mW, the rotation speed of the rotating device is 300rpm, the horizontal moving speed of the laser probe is 0.17mm / s, the horizontal moving distance is 6mm, and the laser probe spot size is 3.2mm.

6. The method for welding the large-size balloon tube feet according to claim 4, characterized in that: In the third step of the welding pretreatment, the laser probe is moved to a position 2mm away from the tail end of the balloon tube; in the fourth step of the welding pretreatment, the laser energy is 1000mW, the rotation speed of the rotating device is 300rpm, and the laser probe spot size is 2.8mm; in the fifth step of the welding pretreatment, the laser energy is 1300mW, the rotation speed of the rotating device is 300rpm, the horizontal moving speed of the laser probe is 0.13mm / s, the horizontal moving distance is 6mm, and the laser probe spot size is 3mm.

7. The method for welding the large-size balloon tube feet according to claim 1, characterized in that: The rotating device includes a chuck travel rail (1), on which a support seat (3) is slidably connected for clamping and driving the left and right end spindles (2) to rotate. A laser probe travel rail (4) is installed on the upper end of the support seat (3), and a laser probe (5) is installed on the laser probe travel rail (4) to slide horizontally by a drive device.

8. The method for welding the large-size balloon tube feet according to claim 7, characterized in that: The support base (3) at the right end includes a seat (3-1) mounted on the chuck travel rail (1), and a chuck (3-2) driven to rotate by a drive device is installed on the inner side of the seat (3-1). The spindle (2) is clamped and connected to the inner side of the chuck (3-2).

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