A tip preparation device and method for easy stent release

Abstract

The application designs a TIP preparation device and preparation method easy to release the stent, wherein the TIP preparation device comprises an air needle, an air needle mounting mold, a TIP mold, a left mold support, a matched rotating mold and a right mold support; the air needle is mounted on the left chuck of the air needle mounting mold; the TIP mold is mounted on the left mold support; the matched rotating mold is mounted on the right mold support; the left mold support is mounted between the air needle mounting mold and the right mold support; the matched rotating mold is nested and clamped on the TIP mold; the matched rotating mold can be adjusted in the nested length relative to the TIP mold; based on the above device, the application also designs a preparation method of the TIP; the Pebax5533(6233) pipe material processed by the pipe material stretching machine is blow molded in three different stages through different stretching speeds, stretching distances, heating times, cooling times and stretching lengths, and finally the TIP can realize that the stent can be smoothly released from the TIP, and the TIP is not easy to break.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a TIP preparation device and a TIP preparation method. BACKGROUND

[0002] Cardiovascular and cerebrovascular diseases are a common disease that seriously threatens the middle-aged and elderly population. The main cause of vascular arterial disease is atherosclerosis, which can cause vascular stenosis and occlusion, and further cause heart attack, stroke and many peripheral vascular diseases. Surgical methods for treating vascular stenosis or occlusion include surgical bypass, bypass surgery, and minimally invasive interventional therapy surgery. Surgical bypass or bypass surgery mainly replaces the diseased blood vessels with autologous veins or artificial blood vessels through surgical methods to restore blood flow. Minimally invasive interventional therapy mainly uses medical devices such as guide wires, balloon catheters and vascular stents to dilate diseased blood vessels through puncture of the femoral artery, radial artery, etc., thereby restoring blood flow. Therefore, the minimally invasive interventional therapy method has been widely used in clinical practice due to its small trauma to patients, short recovery time, and non-inferior treatment effect compared to surgical methods. For example, a long-specification vascular stent delivery system disclosed in Chinese patent CN108245293A mainly consists of a tip head, a stent, an outer sheath tube, an inner sheath tube, an inner tube, and a handle. The designed stent delivery system can effectively solve the problems of limited stent specification, stent displacement and inaccurate positioning caused by the difficulty of loading and releasing the vascular stent.

[0003] Self-expanding stents are one of the commonly used vascular stents, which are small mesh cylindrical medical devices mainly used for treating vascular stenosis and other diseases, and can also be used for various lumen stenosis. The self-expanding vascular stent is usually pre-placed in a TIP, which is sent into the stenosis of the vascular lesion area through the TIP, and then when the stent is pushed out of the TIP, the stent can self-expand to the diameter of the normal blood vessel, expand the stenosis of the blood vessel, and maintain the patency of the blood vessel and the normal flow of blood.

[0004] The manufacturing method of the TIP includes two kinds, one is to use a TIP head production mold to injection mold a raw material, and after the injection molding is completed, the TIP is obtained by demolding; the other is heat shrinkage forming, that is, a mold in the shape of the TIP is used, the TIP sleeve is placed on the mold, a heat shrink tube is used for heat shrinkage, the TIP tube is formed, and finally, the TIP is obtained by disassembling and shearing. For example, a manufacturing method of a new TIP end head for an aortic valve delivery system is disclosed in Chinese Patent CN106618800B, which adopts an injection molding method to manufacture the TIP end head. First, a snap ring is bonded to the outer layer of an inner tube, then the inner tube with the bonded snap ring is inserted into a first mold, the cavity in the first mold is in the shape of the TIP end head, then a second mold is closed with the first mold, the second mold is provided with a striker, the top end of the striker is smooth and will not scratch the inner surface of the inner tube, the outer diameter of the striker corresponds to the inner diameter of the inner tube, and the striker extends into the inner tube when the second mold is closed with the first mold; then the first mold is injected through the injection port on the first mold, the first mold is opened after forming, the second mold is moved to one side, and the formed TIP end head is taken out. However, the TIP manufactured by the above-mentioned processing method has problems of uneven wall thickness, insufficient port elasticity, and easy breakage and falling off, which often leads to the failure of the stent to be released smoothly, and the raw material of the TIP is mostly modified composite material, which has a high cost, the raw material is difficult to analyze and replicate, and the performance cannot meet the release needs of the existing stent.

[0005] The TIP manufactured by the existing TIP preparation process has problems of uneven wall thickness, insufficient port elasticity, and easy breakage and falling off, and the raw material cost is high and the performance cannot meet the release needs of the existing stent. In view of this problem, there is an urgent need to design a new TIP preparation method. SUMMARY

[0006] In view of the problems of high cost of the existing TIP raw material and the performance not meeting the release needs of the existing stent, and the problems of uneven wall thickness, insufficient port elasticity, and easy breakage and falling off of the TIP prepared by the existing preparation process, the present application designs a TIP preparation device and method easy for stent release. Under the premise of using a single raw material to prepare the TIP, the TIP can meet the stable release of the stent while having the effects of uniform wall thickness, good port elasticity, and not easy to break and fall off.

[0007] A TIP preparation device easy for stent release, comprising a pipe blowing machine, the pipe blowing machine comprising a gas needle, a gas needle mounting mold, a TIP mold, a left mold support, a matching rotating mold, and a right mold support.

[0008] The gas needle is mounted on the left chuck of the gas needle mounting mold.

[0009] The TIP mold is mounted on the left mold support.

[0010] The matching rotary mold is installed on the right mold support;

[0011] The left mold support is installed between the air needle installation mold and the right mold support;

[0012] The matching rotary mold is nested on the TIP mold;

[0013] The matching rotary mold can be adjusted in the nested length relative to the TIP mold.

[0014] Preferably, an air cylinder is further included, which is arranged at the right end of the matching rotary mold, and the air cylinder is connected with the matching rotary mold through a rotating shaft.

[0015] Preferably, an air heating blower is arranged above and below the pipe blowing machine respectively, and the directions of the two air heating blowers are opposite.

[0016] Preferably, a pipe clamping device is further arranged on the air cylinder.

[0017] A TIP preparation method with easy support release, comprising the following steps:

[0018] Step S1, first stretching the pipe by using a pipe stretching machine;

[0019] Step S2, after the stretching is completed, the pipe is removed;

[0020] Step S3, the air cylinder, the air needle, the air needle installation mold, the TIP mold, the left mold support, the matching rotary mold and the right mold support are combined and installed to form a pipe blowing machine, and an air heating blower is installed;

[0021] Step S4, the pipe blowing machine is started, the left end of the pipe is inserted into the air needle to the end and then is tightened, and then the central hole of the TIP mold and the rotary mold is sequentially inserted;

[0022] Step S5, the right mold support is pushed to the left, the matching rotary mold is inserted into the TIP mold to be tightened, and the right end of the pipe is naturally straightened and clamped through the pipe clamping device on the air cylinder;

[0023] Step S6, the pipe is shaped by using the pipe blowing machine, and the matching rotary mold and the TIP mold are controlled to rotate through the rotating shaft;

[0024] Step S7, after the pipe blowing machine is blown, the formed pipe is taken out to be cut, and the required TIP is obtained;

[0025] Step S8, the TIP is hot fusion welded with the outer pipe to obtain a finished product.

[0026] Preferably, in the step S1, the pipe is a Pebax5533(6233) pipe.

[0027] Preferably, in the step S6, the shaping of the tube material using the tube blowing machine needs to be carried out in three stages:

[0028] The first stage: the shaping control requirements are: pressure I is 32±8 bar, temperature I is 25±5℃, heating time I is 35±5s, stretching distance is 30±10mm, and stretching speed I is 160-200mm / s;

[0029] The second stage: the shaping control requirements are: pressure II is I+2bar, temperature II is 70±10℃, stretching distance is I±3mm, and stretching speed I is 5-8mm / s;

[0030] The third stage: the shaping control requirements are: temperature III is 100-140℃.

[0031] Preferably, in the step S1, the specific method for stretching the tube material using the tube stretching machine includes:

[0032] Step S101: set the heating temperature of the tube stretching machine to 120-170℃, turn on the heating switch, and wait for the tube stretching machine to warm up to the preset heating temperature±3℃ range;

[0033] Step S102: reset the tube stretching machine, load the tube material, and take out the tube material from the tube stretching machine left side material conveying belt, and sequentially pass through the tube stretching machine pressure roller and the tube stretching machine left clamp;

[0034] Step S103: close the pressure roller, pass the tube material out of the tube stretching machine left clamp hole, and pass into the tube stretching machine right clamp hole, and close the tube stretching machine right clamp;

[0035] Step S104: click to start, and the tube stretching machine starts to run automatically to stretch the tube material;

[0036] Step S105: after the stretching is completed, cut the tube material along the tube stretching machine left clamp end face position with scissors, open the tube stretching machine right clamp again, and take out the tube material.

[0037] Preferably, in the step S104, the stretching speed of the tube stretching machine is 100-130mm / s, the stretching distance is 4-6mm, the heating time is 3-5s, the cooling time is 3-5s, and the stretching length is 15-18mm.

[0038] Preferably, in the step S6, the rotation speed of the rotation axis for controlling the rotation of the rotary die and the TIP die is 10-30r / min.

[0039] The advantages and effects of the present application are as follows:

[0040] 1. The TIP preparation device of the application is easy to release the support, the air needle, the air needle installation mold, the TIP mold, the left mold support, the matching rotating mold and the right mold support are combined to form a pipe blowing machine, and the matching rotating mold is placed in a nested length adjustment manner relative to the TIP mold, through the above design, the application can not only realize the effect of driving the TIP mold to rotate through the matching rotating mold, but also realize the shrinkage of the TIP mold through the matching rotating mold, thereby realizing the technical effects of uniform wall thickness, good port elasticity and not easy to break off of the prepared TIP.

[0041] 2. The TIP preparation device of the application is easy to release the support, an air heating fan is arranged on the pipe blowing machine, the directions of the two air heating fans are opposite, through the above design, the application can ensure that the pipe is uniformly and constantly heated during blowing.

[0042] 3. The TIP preparation method of the application is easy to release the support, in the TIP preparation process, not only two air heating fans with opposite directions are used for blowing and heating, but also the rotating shaft is used to control the rotating speed of the TIP mold to be 10-30 revolutions per minute, through the above design, the application realizes the uniform heating and constancy of the pipe wall during the blowing and stretching process.

[0043] 4. The TIP preparation method of the application is easy to release the support, instead of using the existing TIP modified composite raw material, a single Pebax5533(6233) pipe material is selected as the TIP raw material, under the premise of meeting the support release requirement, the technical effect of reducing the raw material cost is realized.

[0044] 5. The TIP preparation method of the application is easy to release the support, the pipe blowing machine is used to blow the Pebax5533(6233) pipe material treated by the pipe stretching machine, the pipe material is blown in three different stages with different stretching speeds, stretching distances, heating times, cooling times and stretching lengths, and the finally obtained TIP can realize the smooth release of the support from the TIP and the technical effect that the TIP is not easy to break.

[0045] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, the contents of the specification can be implemented, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following will be described in detail with the preferred embodiments of the application and the accompanying drawings.

[0046] According to the detailed description of the specific embodiments of the application in the following text combined with the drawings, those skilled in the art will more clearly understand the above and other purposes, advantages and characteristics of the application. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort. In all the drawings, similar elements or parts are generally identified by similar reference signs. In the drawings, the elements or parts are not necessarily drawn according to the actual proportions.

[0048] Figure 1 is a structure diagram of a TIP preparation device designed by the present application for easy stent release;

[0049] Figure 2 is a flow chart of a TIP preparation method designed by the present application for easy stent release;

[0050] Figure 3 is a method flow chart of a pipe material stretching machine stretching pipe material in a TIP preparation method designed by the present application for easy stent release;

[0051] Reference signs: 1, air needle; 2, air needle installation mold; 3, air heating fan; 4, TIP mold; 5, matching rotating mold; 6, rotating shaft; 7, air cylinder. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. In the following description, specific details such as specific configurations and components are provided only to help a comprehensive understanding of the embodiments of the present application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, in order to be clear and concise, the description of known functions and structures is omitted in the embodiments.

[0053] It should be understood that the "one embodiment" or "the present embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "one embodiment" or "the present embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0054] Furthermore, reference numerals and / or letters can be repeated in different instances in different drawings and / or variations thereof. Such repetitions are meant to be merely for simplification and clarity of discussion and do not in themselves dictate relationships between various embodiments and / or arrangements discussed.

[0055] The term "and / or", merely describes an associated relationship between associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, B alone, and A and B together. The term "and" in this paper describes another relationship between associated objects, which means that there can be two relationships, for example, A and B, which means that there are two cases of A alone and A and B together. In addition, the character " / " in this paper generally means that the associated objects before and after are an "or" relationship.

[0056] The term "at least one" in this paper merely describes the relationship between associated objects, which means that there can be three relationships, for example, at least one of A and B, which means that there are three cases of A alone, A and B together, and B alone.

[0057] It should also be noted that in this paper, relationship terms such as first and second are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion.

[0058] Embodiment 1

[0059] This embodiment introduces a TIP preparation device easy to release the stent, please refer to Figure 1 , specifically includes a pipe blowing machine, the pipe blowing machine includes a gas needle 1, a gas needle installation mold 2, a TIP mold 4, a left mold support, a matching rotating mold 5, a right mold support;

[0060] The gas needle 1 is installed on the left chuck of the gas needle installation mold 2;

[0061] The TIP mold 4 is installed on the left mold support;

[0062] The matching rotating mold 5 is installed on the right mold support;

[0063] The left mold support is installed between the gas needle installation mold 2 and the right mold support;

[0064] The matching rotating mold 5 is nested and clamped on the TIP mold 4;

[0065] The fitting rotating die 5 can be nested with the TIP die 4 in length adjustment, the fitting rotating die 5 can be inserted into the TIP die 4, after the fitting rotating die 5 is inserted into the TIP die 4, the fitting rotating die 5 can realize the compression of the TIP die 4, and when the fitting rotating die 5 rotates, the TIP die 4 can rotate with it.

[0066] Further, the air cylinder 7 is arranged at the right end of the fitting rotating die 5, and the air cylinder 7 is connected with the rotating shaft 6 and the fitting rotating die 5, and the air cylinder 7 can realize the rotation control of the fitting rotating die 5 through the rotating shaft 6.

[0067] Further, the pipe blowing machine is provided with an air heating fan 3 above and below, and the directions of the two air heating fans 3 are opposite, and the air heating fan is used for heating the pipe blowing machine.

[0068] Further, the air cylinder 7 is further provided with a pipe clamping device, the pipe left end is inserted into the air needle 1 to the end and then is compressed, and then is sequentially inserted into the center hole of the TIP die 4 and the rotating die; then the right die support is pushed to the left, the fitting rotating die 5 is inserted into the TIP die 4 for compression, and the pipe right end is clamped after being naturally straightened by the pipe clamping device on the air cylinder 7.

[0069] Further, the air cylinder is further provided with a locking pulley, which can control the mold to rotate with the rotating shaft while ensuring the locking of the pipe.

[0070] The TIP preparation device easy to release the support is designed, the air needle, the air needle mounting die, the TIP die, the left die support, the fitting rotating die and the right die support are combined to form the pipe blowing machine, and the fitting rotating die is placed in the nested length adjustment mode relative to the TIP die, through the above design, the TIP die can be rotated by the fitting rotating die, the TIP die can be compressed by the fitting rotating die, and the prepared TIP has the technical effects of uniform wall thickness, good port elasticity and not easy to break off.

[0071] The TIP preparation device easy to release the support is designed, the pipe blowing machine is provided with an air heating fan above and below, and the directions of the two air heating fans are opposite, through the above design, the pipe can be uniformly and constantly heated in the blowing process.

[0072] Example 2

[0073] Based on the above example 1, this example mainly introduces a TIP preparation method easy to release the support, please refer to Figure 2 , including the following steps:

[0074] Step S1, first use the pipe stretching machine to stretch the Pebax 5533 (6233) pipe, the specific method please refer to Figure 3 , specifically including:

[0075] Step S101, set the heating temperature of the pipe stretching machine to 120-170℃, turn on the heating switch, and wait for the pipe stretching machine to heat up to the preset heating temperature ±3℃;

[0076] Step S102, reset the pipe stretching machine, load the pipe, and take out the pipe from the left side of the pipe stretching machine. The material conveying belt passes through the pinch roller and the left clamp of the pipe stretching machine in turn;

[0077] Step S103, close the pinch roller, and the pipe is pulled out from the left clamp hole of the pipe stretching machine and inserted into the right clamp hole of the pipe stretching machine, and the right clamp of the pipe stretching machine is closed;

[0078] Step S104, click to start, the pipe stretching machine starts to run automatically, and the pipe stretching machine starts to stretch the pipe. The stretching speed of the pipe stretching machine is 100-130mm / s, the stretching distance is 4-6mm, the heating time is 3-5s, the cooling time is 3-5s, and the stretching length is 15-18mm;

[0079] Step S105, after stretching, use scissors to cut along the left clamp end face position of the pipe stretching machine, open the right clamp of the pipe stretching machine again, and take out the pipe.

[0080] Step S2, after stretching, take out the pipe;

[0081] Step S3, combine and install the air cylinder 7, air needle 1, air needle installation mold 2, TIP mold 4, left mold support, matching rotating mold 5 and right mold support to form a pipe blowing machine, and install an air heating fan 3;

[0082] Step S4, start the pipe blowing machine, insert the left end of the pipe into the air needle 1 to the end, then shrink, and then insert into the center hole of the TIP mold 4 and the rotating mold in turn;

[0083] Step S5, push the right mold support to the left, so that the matching rotating mold 5 is inserted into the TIP mold 4 for shrinkage, and the right end of the pipe is clamped after being naturally straightened by the pipe clamping device on the air cylinder 7;

[0084] Step S6, use the pipe blowing machine to shape the pipe, and control the matching rotating mold 5 and TIP mold 4 to rotate at a speed of 10-30r / min through the rotating shaft 6;

[0085] The shaping needs to be divided into three stages:

[0086] The first stage: the shaping control requirements are: pressure I is 32±8bar, temperature I is 25±5℃, heating time I is 35±5s, the stretching distance is 30±10mm, and the stretching speed I is 160-200mm / s;

[0087] The second stage: the shaping control requirements are: pressure II is I+2bar, temperature II is 70±10℃, the stretching distance is I±3mm, and the stretching speed I is 5-8mm / s;

[0088] The third stage: the shaping control requirements are: temperature III is 100-140℃.

[0089] Step S7, after the pipe blowing machine blows, the formed pipe is taken out for cutting, and the required TIP is obtained.

[0090] Step S8, the TIP is hot fusion welded with the outer pipe, and the finished product is obtained.

[0091] The TIP preparation method easy for stent release designed in the application not only uses two air heating fans with opposite directions to blow and heat, but also uses a rotating shaft to control the rotating speed of the TIP mold to be 10-30 revolutions per minute. Through the above design, the uniform heating constancy of the pipe wall in the process of blow stretching is realized.

[0092] The TIP preparation method easy for stent release designed in the application no longer uses the existing TIP modified composite raw material, but selects to use a single Pebax5533(6233) pipe material as the TIP raw material, realizes the technical effect of reducing the raw material cost under the premise of meeting the needs of stent release.

[0093] The TIP preparation method easy for stent release designed in the application uses a pipe blowing machine to blow the Pebax5533(6233) pipe material processed by the pipe stretching machine, and blow stretches in three different stages with different stretching speeds, stretching distances, heating times, cooling times and stretching lengths. The finally obtained TIP can realize the technical effect that the stent can be smoothly released from the TIP, and the TIP is not easy to break.

[0094] It should be understood that the above specific embodiments of the application are only used for illustrative or explanatory purposes of the principles of the application, and do not constitute a limitation on the application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the application shall be included in the protection scope of the application. In addition, the appended claims of the application are intended to cover all variations and modifications falling within the scope and boundary of the appended claims, or the equivalent forms of such scope and boundary.

Claims

1. A TIP fabrication apparatus for easy stent release, comprising a tube blow molding machine, characterized in that, The pipe blow molding machine includes an air needle (1), an air needle mounting mold (2), a TIP mold (4), a left mold support, a cooperating rotating mold (5), and a right mold support; The air needle (1) is installed on the left clamp of the air needle installation mold (2); The TIP mold (4) is mounted on the left mold support; The rotating mold (5) is mounted on the right mold support; The left mold support is installed between the air needle mounting mold (2) and the right mold support; The rotating mold (5) is nested and engaged on the TIP mold (4); The nesting length of the rotating mold (5) relative to the TIP mold (4) can be adjusted; The pipe blow molding machine is equipped with an air heating fan (3) at the top and bottom, and the two air heating fans (3) are in opposite directions.

2. The TIP fabrication device for easy stent release according to claim 1, characterized in that, It also includes a cylinder (7), which is located at the right end of the mating rotating mold (5) and is connected to the mating rotating mold (5) via a rotating shaft (6).

3. The TIP fabrication device for easy stent release according to claim 2, characterized in that, The cylinder (7) is also equipped with a pipe clamping device.

4. A method for preparing a TIP that facilitates stent release, characterized in that, Includes the following steps: Step S1: First, stretch the pipe using a pipe stretching machine; Step S2: After stretching is complete, remove the pipe. Step S3: Assemble and install the cylinder (7), air needle (1), air needle mounting mold (2), TIP mold (4), left mold bracket, rotating mold (5), and right mold bracket to form a pipe blow molding machine, and install an air heating fan (3). Step S4: Start the pipe blow molding machine, insert the left end of the pipe into the air needle (1) until the end is tightened, and then insert it into the TIP mold (4) and the center hole of the rotary mold in sequence; Step S5: Push the right mold support to the left so that the rotating mold (5) can be inserted into the TIP mold (4) for tightening, and the right end of the pipe is naturally straightened and clamped by the pipe clamping device on the cylinder (7); Step S6: Use a pipe blow molding machine to shape the pipe and control the rotation of the rotating mold (5) and TIP mold (4) by rotating shaft (6); Step S7: After the pipe blow molding machine finishes blow molding, remove the formed pipe and cut it to obtain the required TIP; Step S8: Perform heat fusion welding between the TIP and the outer tube to obtain the finished product.

5. The method for preparing a TIP that facilitates stent release according to claim 4, characterized in that, In step S1, the pipe is Pebax 5533 or Pebax 6233 pipe.

6. A method for preparing a TIP that facilitates stent release according to any one of claims 4 or 5, characterized in that, In step S6, the shaping of the pipe using a pipe blow molding machine needs to be carried out in three stages: The first stage: the shaping control requirements are: pressure I is 32±8 bar, temperature I is 25±5℃, heating time I is 35±5s, stretching distance is 30±10mm, and stretching speed I is 160~200mm / s; The second stage: the shaping control requirements are: pressure II is I+2 bar, temperature II is 70±10℃, stretching distance is I±3mm, and stretching speed I is 5~8mm / s; The third stage: the shaping control requirements are: temperature III is 100~140℃.

7. The method for preparing a TIP that facilitates stent release according to claim 5, characterized in that, In step S1, the specific method for stretching the pipe using a pipe stretching machine includes: Step S101: Set the heating temperature of the pipe stretching machine to 120~170℃, turn on the heating switch, and wait for the pipe stretching machine to heat up to the preset heating temperature within ±3℃ range. Step S102: Reset the pipe stretching machine, load the pipe, take out the pipe, and pass it through the material conveyor belt on the left side of the pipe stretching machine in sequence through the pressure roller and the left clamp of the pipe stretching machine. Step S103: Close the pressure roller, pass the pipe through the left clamp hole of the pipe stretching machine and into the right clamp hole of the pipe stretching machine, and close the right clamp of the pipe stretching machine. Step S104: Click Start, and the pipe stretching machine will start running automatically to stretch the pipe. Step S105: After stretching is completed, cut the pipe along the left clamp end face of the pipe stretching machine with scissors, open the right clamp of the pipe stretching machine again, and remove the pipe.

8. The method for preparing a TIP that facilitates stent release according to claim 7, characterized in that, In step S104, the stretching speed of the pipe stretching machine is 100~130mm / s, the stretching distance is 4~6mm, the heating time is 3~5s, the cooling time is 3~5s, and the stretching length is 15~18mm.

9. The method for preparing a TIP that facilitates stent release according to claim 6, characterized in that, In step S6, the rotating shaft (6) controls the rotation speed of the rotating mold (5) and the TIP mold (4) to be 10~30 revolutions / minute.

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