CN111632255B - A kind of vasodilator tube for cardiovascular medicine and preparation method thereof - Google Patents

Abstract

The invention discloses a vascular dilation tube for cardiovascular medicine and a preparation method thereof. The dilation tube comprises a sheath tube, an expansion rack and a hand-held seat; There is a guide wire, the second guide tube is provided with a main traction wire, the end of the sheath tube is provided with a positioning head and a spring coil, the spring coil is provided with a secondary traction wire 1, the secondary traction wire 1 is connected with the main traction wire, and the expansion frame includes a The first-level expansion rack and the second-level expansion rack include a sliding sleeve and an expansion strip. The sliding sleeve is sleeved on the sheath tube, and the expansion strip is located on the sliding sleeve. The sliding sleeve is provided with the second auxiliary traction wire, the second auxiliary traction wire It is connected with the main traction wire, the secondary expansion frame is arranged on the outside of the expansion strip, and the secondary expansion frame is provided with an auxiliary traction wire 3, which is connected with one end of the main traction wire; A rotating column is connected, and the rotating column is connected with the main traction wire; the present invention has reasonable structural design, safe and convenient operation, and is suitable for mass popularization.

Description

A kind of vasodilator tube for cardiovascular medicine and preparation method thereof

technical field

The invention relates to the technical field of medical devices, in particular to a vasodilator tube for cardiovascular medicine and a preparation method thereof.

Background technique

A vasodilator is a medical device used in the field of vascular interventional therapy to treat vascular blockage. After observing the lesion site through angiography of the lesion site, the operator selects a balloon of appropriate size and a corresponding type of stent, sends the balloon catheter to the stenosis, injects a certain pressure to inflate the balloon, and utilizes the mechanical properties of balloon expansion. The squeezing action expands the narrowed or blocked blood vessels, releases the stent, and achieves the curative effect of treating blood vessel blockage.

However, the existing vasodilator tubes generally have the following defects in use: 1. The degree of vasodilation cannot be adjusted. When the dilation balloon is expanded to the maximum extent and cannot meet the conditions of use, the vasodilator tube needs to be removed and re-selected with a larger size. This will undoubtedly increase the pain of the patient and the risk of surgery; 2. During the use of the balloon, due to the compression of the blood vessels, it is easy to displace, and the vascular dilation effect is not ideal; 3. The balloon During the expansion process, the degree of expansion is not easy to control, and it is easy to cause dangerous accidents such as rupture of blood vessels in patients, and the safety is poor.

SUMMARY OF THE INVENTION

In view of the above existing technical problems, the present invention provides a vasodilator tube for cardiovascular medicine which is convenient to control the opening degree of vasodilation.

The technical scheme of the present invention is as follows: a vascular dilation tube for cardiovascular medicine, comprising a sheath tube, an expansion frame and a hand-held seat; one end of the sheath tube is closed, and the outer side of the sheath tube close to the closed end of the sheath tube is sequentially fixed and sleeved with a guide ring 1 and a guide Circle 2, a guide tube 1 and a guide tube 2 are arranged inside the sheath tube. It is located on the outer side of the first guide tube, and the main traction wires are arranged inside the three guide tubes. It is recessed and provided with a through hole, a hollow tube is arranged at the connection between the positioning head and the sheath tube, a spring coil is arranged inside the tail of the positioning head, the position of the guide ring 1 corresponds to the position of the spring coil, and the inner side of the spring coil is evenly arranged with 5-8 1 auxiliary traction wire 1, 5-8 auxiliary traction wires 1 respectively pass through the guide ring 1 and the sheath tube and are hinged together, and the hinge is connected with one end of one of the main traction wires; the expansion rack includes a first-level expansion rack and a second-level expansion rack , the first-level expansion frame includes a sliding sleeve and an expansion strip. There are two sliding sleeves. The two sliding sleeves are movably sleeved on the sheath tube and are located on both sides of the second guide ring. There are 5-8 expansion strips. 5-8 expansion strips are evenly arranged between the two sliding sleeves, one of the sliding sleeves is connected with the secondary traction wire 2, and the secondary traction wire 2 penetrates the outer wall of the sheath and is connected to one end of the other main traction wire. The frame is arranged on the outside of the expansion strip, and the secondary expansion frame is connected with the auxiliary traction wire 3, and the auxiliary traction wire 3 passes through the guide ring 2 and the sheath tube and is connected with one end of the last main traction wire; the hand-held seat is fixedly arranged on the open end of the sheath tube, The end of the hand-held seat away from the sheath tube is fixedly provided with a guide wire catheter, and the guide wire catheter is connected to the guide tube. Three sides of the hand-held seat are movably clamped with rotating columns, and the three rotating columns are respectively 3 main traction wires. The other end is connected, and the 3 rotating columns are used to wind the 3 main traction wires respectively.

Further, the number of secondary expansion racks corresponds to the number of expansion bars. The secondary expansion rack includes expansion plates and installation sleeves. The expansion plates are arc-shaped plates. The installation direction of the expansion plates is consistent with the length direction of the expansion bars. Two support rods are slidably clamped on the inner side. The installation sleeve is fixedly connected to the middle of the expansion strip. The inner movable sleeve of the installation sleeve is provided with a sliding column. The bottom end of the column is connected with auxiliary traction wire 3, each auxiliary traction wire 3 passes through the guide ring 1 and the sheath tube and is hinged together, and the hinge point is connected with one end of the last main traction wire; when the first-stage expansion frame is expanded to the maximum When the requirement of vascular dilatation is still not met, by rotating a certain rotating column, the main traction wire corresponding to the rotating column pulls the auxiliary traction wire 3, and each sliding column slides in the installation sleeve, close to the expansion strip, thereby making the two support rods Move closer, spread the expansion plate outward, improve the degree of expansion of blood vessels, and provide favorable conditions for the treatment of cardiovascular diseases.

Further, a movable sleeve is provided at the connection between the rotating column and the hand-held base, the rotating column is movable sleeved in the movable sleeve, the bottom of the rotating column is provided with a locking disk, the locking disk is provided with a clamping slot, and the bottom of the movable sleeve is provided with a clamping block. , the clamping block can be clamped with the clamping slot, there is a circlip inside the movable sleeve, the circlip is sleeved on the rotating column, the upper end of the circlip is in contact with the outer wall of the rotating column, and the lower end is in contact with the inner wall of the movable sleeve; Press down the rotating column to disengage the slot on the locking disc from the blocking block, then rotate the rotating column to wind and rewind the corresponding main traction wire. The block is clamped to avoid the loosening of the main traction wire during the process of vascular expansion, and to improve the effect of vascular expansion.

Further, the head end of the positioning head is provided with a guide groove along its length direction; by setting the guide groove, the resistance of the positioning head in the blood vessel of the patient is reduced, the movement of the positioning head in the blood vessel of the patient is made smoother, and the pain of the patient is relieved. .

Further, the second auxiliary traction wire is fixedly connected with one of the sliding sleeves, then passes through the other sliding sleeve, and finally is fixedly connected with the other main pulling wire; when the main pulling wire pulls the second auxiliary pulling wire, the two sliding sleeves are close to each other. , the expansion strip is squeezed and bent to support the blood vessel; and the support point of the expansion strip will not change with the movement of the sliding sleeve, which improves the accuracy of the support point of the blood vessel.

Further, the expansion strip has a thin plate-like structure. By setting the expansion strip of the thin plate structure, the pressure between the expansion strip and the inner wall of the patient's blood vessel is reduced, the rupture of the patient's blood vessel is avoided during the expansion of the expansion strip, and the safety of the device is improved.

The present invention also provides a method for preparing the above-mentioned vasodilator tube, comprising the following steps:

Step 1. Using a mold, the hollow pipe is formed by pressure heating and blow molding, respectively, to prepare a sheath tube, a positioning head, a hollow tube and a guide wire catheter; a spring coil is added during the forming process of the positioning head;

Step 2: Use a hollow tube material to pressurize and heat blow molding to prepare a guide tube 1 and a guide tube 2, and glue and fix the three guide tubes 2 on the outside of the guide tube 1, and finally put the guide tube 1 and the guide tube 2 on the guide tube. The inside of the sheath tube is bonded and fixed with the inner wall of the sheath tube;

Step 3, wear main traction wires in each guide tube 2 respectively;

Step 4. Injection molding guide ring 1, guide ring 2 and first-level expansion frame, adding auxiliary traction wire 1 and auxiliary traction wire 2 during the molding process of guide ring 1 and guide ring 2; then place guide ring 2 on the first-level expansion frame In the middle, it is put on the outer side of the sheath together with the first-level expansion frame. Finally, the second guide ring is bonded and fixed to the sheath. The second auxiliary traction wire is connected with the first-level expansion frame and then inserted into the sheath, and is connected with one of the main traction wires. Connect; set the guide ring on the end of the sheath tube, and fix it by bonding. Finally, the positioning head is bonded and fixed with the end of the sheath tube through the hollow tube. The auxiliary traction wire is connected with the spring coil and penetrates the sheath tube, and is connected with the sheath tube. One of the other main pull wires is connected;

Step 5: Injection molding the secondary expansion frame, adding auxiliary traction wire 3 during the molding process of the secondary expansion frame, installing the secondary stretching frame on the outside of the primary expansion frame, and making the auxiliary traction wire 3 pass through the sheath and connect with the last main frame. Pull wire connection;

Step 6: Prepare the hand-held seat by punching, glue and fix the guide wire guide tube and the sheath tube on both sides of the hand-held seat respectively, thread the guide wire into the guide tube one through the guide wire guide tube, and connect the three rotating columns on the hand-held seat They are fixed and welded to the other ends of the three main traction wires respectively.

The use method of the present invention is as follows: when in use, the guide wire is inserted into the guide tube 1 through the guide wire catheter on the hand-held seat, the sheath tube is inserted into the blood vessel of the patient under the action of the guide wire, and the position of the positioning head is observed through an external X-ray device. , when the positioning head passes through the patient's vascular lesions, the sheath stops inserting, and rotates the rotation column corresponding to the auxiliary traction wire 1 and the main traction wire, so that the auxiliary traction wire is loosened, and the coil will spread the positioning head and fix it on the patient. A designated position in the blood vessel, at this time, the blood establishes a circulation channel through the through hole and the hollow tube; by rotating the rotating column corresponding to the secondary traction wire 2 and the main traction wire, when the main traction wire pulls the secondary traction wire 2, the two sliding sleeves approach each other. , the expansion strip is squeezed and bent to support and expand the patient's diseased part. When the expansion strip is expanded to the maximum, by rotating the rotating column corresponding to the main traction wire and the auxiliary traction wire 3, the auxiliary traction wire 3 pulls each The sliding column slides in the installation sleeve and is close to the expansion strip, so that the two support rods are brought closer together, and the expansion plate is stretched outward, and the blood vessels of the patient's diseased part are expanded here; after use, the above steps are reversed. Simply remove the sheath from the handheld holder.

Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention has a reasonable structure design, convenient and safe operation, and by setting different guide tubes 1 and 2 in the sheath, the movement of the guide wire and the main traction wire is made easier. Smooth; by setting the positioning head, the positioning head is fixed at a specific position in the patient's blood vessel by the spring coil, which avoids the displacement of the first-level expansion rack and the second-level expansion rack during the vascular expansion operation, thereby improving the practicability of the blood device. It has a positive effect on the rehabilitation of patients with cardiovascular disease; at the same time, by setting up a first-level expansion rack and a second-level expansion rack, the sheath tube only needs to enter the patient's blood vessel once, and the expansion of the patient's blood vessel can be achieved to different degrees, which greatly reduces the pain of the patient and reduce the risk of surgery.

Description of drawings

Fig. 1 is the structural representation under the initial state of the present invention;

Fig. 2 is the structural schematic diagram of the first-level expansion frame of the present invention and the positioning head under the support state;

3 is a schematic structural diagram of the first-level expansion rack, the second-level expansion rack and the positioning head of the present invention when they are all stretched;

Fig. 4 is the distribution diagram of guide tube one and guide tube two of the present invention in the sheath;

Fig. 5 is the structural representation of the positioning head of the present invention;

Fig. 6 is the connection schematic diagram of the positioning head of the present invention and the sheath;

Fig. 7 is the connection schematic diagram of the secondary expansion rack of the present invention and the primary expansion rack;

Fig. 8 is the connection schematic diagram of the rotating column of the present invention and the movable sleeve;

Fig. 9 is the connection schematic diagram of the hand-held seat of the present invention and the sheath;

Among them, 1-sheath tube, 10-guide ring one, 11-guide ring two, 12-guide tube one, 13-guide tube two, 14-positioning head, 140-through hole, 141-hollow tube, 142-spring coil , 143-Auxiliary traction wire 1, 144-Guide groove, 2-Expansion rack, 20-First-level expansion rack, 200-Sliding sleeve, 201-Expansion strip, 202-Auxiliary traction wire 2, 21-Second-level expansion rack, 210 -Auxiliary traction wire 3, 211-Expansion plate, 212-Installation sleeve, 213-Support rod, 214-Sliding column, 3-Hand-held seat, 30-Guide wire guide tube, 31-Rotating column, 310-Lock disc, 311- Card slot, 32-active sleeve, 320-block, 321-circlip, 4-guide wire, 5-main traction wire.

Detailed ways

Example: a vascular dilation tube for cardiovascular medicine as shown in Figures 1, 4, 5, and 6, comprising a sheath tube 1, a stent 2 and a hand-held seat 3; one end of the sheath tube 1 is closed, and is close to the sheath tube 1 The outer side of the closed end is sequentially fixed with a guide ring 10 and a guide ring 2 11, the sheath tube 1 is provided with a guide tube 1 12 and a guide tube 2 13, the guide tube 1 12 is located in the inner center of the sheath tube 1, and the guide tube 1 12 A guide wire 4 is arranged movably inside, and three guide tubes 13 are arranged. The three guide tubes 2 13 are respectively located on the outer sides of the guide tube one 12, and the main traction wires 5 are arranged inside the three guide tubes 2 13; the sheath tube 1 The closed end is provided with a positioning head 14, the positioning head 14 is a smooth conical structure, and the interior is hollow, the head of the positioning head 14 is recessed inward, and a through hole 140 is provided, and the positioning head 14 is connected with the sheath tube 1. There is a hollow tube 141, a spring ring 142 is arranged inside the tail of the positioning head 14, the position of the guide ring 10 corresponds to the position of the spring ring 142, and the inner side of the spring ring 142 is evenly provided with 6 auxiliary traction wires 143, 6 auxiliary traction wires One 143 penetrates the guide ring one 10 and the sheath tube 1 respectively and is hinged together, and the hinge is connected with one end of one of the main traction wires 5; the head end of the positioning head 14 is provided with a guide groove 144 along its length direction; by setting the guide groove 144, reducing the resistance of the positioning head 14 in the blood vessel of the patient, making the movement of the positioning head 14 in the blood vessel of the patient smoother, and reducing the pain of the patient;

As shown in Figures 2, 3 and 7, the expansion stent 2 includes a primary expansion stent 20 and a secondary expansion stent 21. The primary expansion stent 20 includes a sliding sleeve 200 and an expansion strip 201. The sliding sleeve 200 is provided with two, two The sliding sleeves 200 are all movably sleeved on the sheath tube 1 and are located on both sides of the guide ring 2 11. There are six expansion strips 201, and the six expansion strips 201 are evenly arranged between the two sliding sleeves 200. The expansion strips 201 It is a thin plate-like structure. By setting the expansion strip 201 of the thin plate structure, the pressure between the expansion strip 201 and the inner wall of the patient's blood vessel is reduced, so as to avoid the rupture of the patient's blood vessel during the expansion of the expansion strip 201, and improve the safety of the device; the sliding sleeve 200 The second auxiliary traction wire 202 is connected to the upper, and the second auxiliary pulling wire 202 is fixedly connected with one of the sliding sleeves 200, then passes through the other sliding sleeve 200, and finally is fixedly connected with the other main pulling wire 5; When the second wire 202 is pulled, the two sliding sleeves 200 are close to each other, and the expansion strip 201 is squeezed and bent to support the blood vessel; and the support point of the expansion strip 201 will not change with the movement of the sliding sleeve 200, improving the blood vessels. The accuracy of the support point; the secondary expansion frame 21 is arranged on the outside of the expansion strip 201, the secondary expansion frame 21 is connected with the auxiliary traction wire 3 210, and the auxiliary traction wire 3 210 penetrates the guide ring 2 11 and the sheath tube 1 and is connected to the last one. One end of the main traction wire 5 is connected; the number of secondary expansion racks 21 corresponds to the number of expansion bars 201 , the secondary expansion rack 21 includes an expansion plate 211 and an installation sleeve 212 , the expansion plate 211 is an arc plate, and the expansion plate 211 is installed The direction is consistent with the length direction of the expansion strip 201. The inner side of the expansion plate 211 is slidably connected with two support rods 213. The installation sleeve 212 is fixedly connected to the middle of the expansion strip 201. The inner movable sleeve of the installation sleeve 212 is provided with a sliding column 214. The other end of the rod 213 penetrates through the installation sleeve 212 and is hinged with the sliding column 214 respectively. The bottom end of each sliding column 214 is connected with a secondary traction wire 3 210, and each secondary traction wire 3 210 respectively penetrates the guide ring 10 and the sheath tube. 1 After being hinged together, the hinge point is connected with one end of the last main traction wire 5; when the first-level expansion rack 20 is expanded to the maximum and cannot meet the requirements of vascular expansion, a certain rotating column 31 is rotated so that the rotating column 31 corresponds to The main traction wire 5 pulls the secondary traction wire 3 210, and each sliding column 214 slides in the installation sleeve 212, close to the expansion bar 201, so as to make the two support rods 213 close together, and the expansion plate 211 is stretched outward to improve the expansion of the blood vessel. degree, to provide favorable conditions for the treatment of cardiovascular disease;

As shown in Figures 1, 8 and 9, the hand-held base 3 is fixedly arranged at the open end of the sheath tube 1, and the end of the hand-held base 3 away from the sheath tube 1 is fixedly provided with a guide wire catheter 30, the guide wire catheter 30 and the guide tube 12 Turn on, the three sides of the hand-held base 3 are movably connected with rotating columns 31, the three rotating columns 31 are connected to the other ends of the three main traction wires 5 respectively, and the three rotating columns 31 are respectively used for winding the three main traction wires. Wire 5; a movable sleeve 32 is provided at the connection between the rotating column 31 and the hand-held base 3, the rotating column 31 is movably sleeved in the movable sleeve 32, the bottom of the rotating column 31 is provided with a locking disk 310, and the locking disk 310 is provided with a card slot 311, the bottom of the movable sleeve 32 is provided with a clamping block 320, the clamping block 320 can be clamped with the clamping slot 311, the movable sleeve 32 has a circlip 321 inside, the circlip 321 is sleeved on the rotating column 31, and the upper end of the circlip 321 is connected to the rotating column. 31 is in contact with the outer wall, and the lower end is in contact with the inner wall of the movable sleeve 32; when in use, press the rotating column 31 downward to disengage the clamping slot 311 on the locking plate 310 from the clamping block 320, and then rotate the rotating column 31 to adjust the corresponding The main traction wire 5 is wound and wound, and after the winding is completed, the locking disc 310 is clamped with the blocking block 320 under the action of the circlip 321, so as to prevent the main traction wire 5 from loosening during the process of vascular expansion, and improve the vascular expansion effect; The sheath tube 1, the guide wire catheter 30, the positioning head 14 and the hollow tube 141 are all PET materials, the guide wire 4 and the main pulling wire 5 are all nickel-titanium alloy wires, and the diameter of the guiding wire 4 is 0.55mm, and the diameter of the main pulling wire 5 is 0.55 mm. is 0.25mm; both the primary expansion stent 20 and the secondary expansion stent 21 are made of titanium-nickel alloy material covered with silica gel coating.

The preparation method of the vasodilator tube of the above-mentioned embodiment comprises the following steps:

Step 1. Using a mold, the hollow pipe is formed by pressure heating and blow molding, respectively, to prepare the sheath tube 1, the positioning head 14, the hollow tube 141 and the guide wire catheter 30; the positioning head 14 is added during the forming process. The spring coil 142;

Step 2: Use a hollow tube material to pressurize and heat blow molding to prepare a guide tube one 12 and a guide tube two 13, and glue and fix the three guide tubes two 13 on the outside of the guide tube one 12, and finally connect the guide tube one 12 and the guide tube one. The tube two 13 is sheathed inside the sheath tube 1, and is bonded and fixed with the inner wall of the sheath tube 1;

Step 3: pierce the main traction wire 5 in each guide tube 2 13 respectively;

Step 4, injection molding guide ring one 10, guide ring two 11 and first-level expansion frame 20, guide ring one 10, guide ring two 11 during the molding process, add auxiliary traction wire one 143 and auxiliary traction wire two 202; The second 11 is placed in the middle of the first-level expansion rack 20, and is sheathed on the outer side of the sheath tube 1 together with the first-level expansion rack 20. Finally, the guide ring II 11 is bonded and fixed to the sheath tube, and the auxiliary traction wire II 202 is connected to the first-level expansion rack. 20 is connected to the inside of the sheath tube 1, and is connected with one of the main traction wires 5; the guide ring 10 is sleeved on the end of the sheath tube 1, and is fixed by bonding, and finally the positioning head 14 is connected to the sheath tube 1 through the hollow tube 141. The ends are bonded and fixed, and the auxiliary traction wire 1 143 is connected to the spring coil 142 and then penetrates the sheath tube 1, and is connected with the other main traction wire 5;

Step 5: Injection molding the secondary expansion rack 21, adding the auxiliary traction wire 3 210 during the molding process of the secondary expansion rack 21, installing the secondary expansion rack 21 on the outside of the primary expansion rack 20, and making the auxiliary traction wire 3 210 penetrate the sheath After the tube 1 is connected with the last main pulling wire 5;

Step 6. Prepare the hand-held seat 3 by punching, and fix the guide wire catheter 30 and the sheath tube 1 on both sides of the hand-held seat 3, respectively. The three rotating columns 31 on the base 3 are respectively fixed and welded with the other ends of the three main traction wires 5 .

When in use, the guide wire 4 is inserted into the guide tube 1 12 through the guide wire catheter 30 on the hand-held base 3, the sheath tube 1 is inserted into the blood vessel of the patient under the action of the guide wire 4, and the position of the positioning head 14 is observed by an external X-ray device. , when the positioning head 14 passes through the patient's vascular disease site, the sheath tube 1 stops being inserted, and the rotating column 31 corresponding to the auxiliary pulling wire 1 143 and the main pulling wire 5 is rotated to relax the auxiliary pulling wire 143, and the spring coil 143 will be positioned The head 14 is stretched and fixed at a designated position in the patient's blood vessel. At this time, the blood establishes a circulation channel through the through hole 140 and the hollow tube 141; 5. When the secondary traction wire 2 202 is pulled, the two sliding sleeves 200 are close to each other, and the expansion strip 201 is squeezed and bent to support and expand the patient's diseased part. The rotation column 31 corresponding to the wire 5 and the auxiliary pulling wire 3 210 makes the auxiliary pulling wire 3 210 pull each sliding column 214 to slide in the installation sleeve 212 and approach the expansion bar 201, thereby making the two support rods 213 close together, and the expansion plate 211 is stretched outward, where the blood vessels of the patient's diseased part are dilated; after use, the above steps are reversed, and the sheath tube 1 can be removed through the hand-held base 3 .

Claims (2)

1. A vasodilator for cardiovascular internal medicine is characterized by comprising a sheath tube (1), an expansion frame (2) and a handheld seat (3); one end of the sheath tube (1) is closed, a first guide tube (12) and a second guide tube (13) are sequentially and fixedly sleeved on the outer side close to the closed end of the sheath tube (1), the first guide tube (12) is positioned in the central position in the sheath tube (1), guide wires (4) are movably arranged in the first guide tube (12), 3 guide tubes (13) are arranged in the second guide tube (13), the 3 guide tubes (13) are respectively positioned on the outer sides of the first guide tube (12), and main traction wires (5) are arranged in the 3 guide tubes (13); the end closed end of the sheath tube (1) is provided with a positioning head (14), the positioning head (14) is of a smooth conical structure and is hollow inside, the head of the positioning head (14) is recessed inwards and is provided with a through hole (140), a hollow tube (141) is arranged at the joint of the positioning head (14) and the sheath tube (1), a spring ring (142) is arranged on the inner side of the tail of the positioning head (14), the position of the guide ring I (10) corresponds to the position of the spring ring (142), 5-8 auxiliary traction wires I (143) are uniformly arranged on the inner side of the spring ring (142), the 5-8 auxiliary traction wires I (143) respectively penetrate through the guide ring I (10) and the sheath tube (1) and then are hinged together, and the hinged part is connected with one end of one main traction wire (5); expand frame (2) including one-level expansion frame (20) and second grade expansion frame (21), one-level expansion frame (20) is including sliding sleeve (200) and expansion strip (201), sliding sleeve (200) are provided with two, and two equal movable sleeves of sliding sleeve (200) are established on sheath pipe (1), and are located the both sides of guide ring two (11), expansion strip (201) are provided with 5-8, and 5-8 expansion strip (201) evenly set up between two sliding sleeve (200), are connected with vice traction wire two (202) on one of them sliding sleeve (200), vice traction wire two (202) run through behind sheath pipe (1) outer wall and are connected with another main traction wire (5) one end wherein, second grade expansion frame (21) sets up in the expansion strip (201) outside, and second grade expansion frame (21) are connected with vice traction wire three (210), vice traction wire three (210) run through behind guide ring two (11) and sheath pipe (1) and last main traction wire (1), and vice traction wire three (210) (5) One end is connected; the handheld seat (3) is fixedly arranged at the opening end of the sheath tube (1), one end, far away from the sheath tube (1), of the handheld seat (3) is fixedly provided with a guide wire guide tube (30), the guide wire guide tube (30) is communicated with a guide tube I (12), 3 side faces of the handheld seat (3) are movably clamped with rotating columns (31), the 3 rotating columns (31) are respectively connected with the other ends of 3 main traction wires (5), and the 3 rotating columns (31) are respectively used for winding the 3 main traction wires (5);

the number of the secondary expansion frames (21) is corresponding to the number of the expansion strips (201), the secondary expansion frames (21) comprise expansion plates (211) and mounting sleeves (212), the expansion plate (211) is an arc-shaped plate, the installation direction of the expansion plate (211) is consistent with the length direction of the expansion strip (201), two support rods (213) are slidably clamped at the inner side of the expansion plate (211), the mounting sleeve (212) is fixedly connected with the middle part of the expansion strip (201), a sliding column (214) is movably sleeved in the mounting sleeve (212), the other ends of the two support rods (213) penetrate through the mounting sleeve (212) and then are movably hinged with the sliding column (214), the bottom end of each sliding column (214) is connected with an auxiliary traction wire III (210), each auxiliary traction wire III (210) penetrates through the guide ring I (10) and the sheath tube (1) respectively and then is hinged together, and the hinge point is connected with one end of the last main traction wire (5);

a movable sleeve (32) is arranged at the joint of the rotary column (31) and the handheld seat (3), the rotary column (31) is movably sleeved in the movable sleeve (32), a locking disc (310) is arranged at the bottom of the rotary column (31), a clamping groove (311) is formed in the locking disc (310), a clamping block (320) is arranged at the bottom of the movable sleeve (32), the clamping block (320) can be clamped with the clamping groove (311), a clamping spring (321) is arranged in the movable sleeve (32), the clamping spring (321) is sleeved on the rotary column (31), the upper end of the clamping spring (321) is abutted to the outer wall of the rotary column (31), and the lower end of the clamping spring is abutted to the inner wall of the movable sleeve (32);

the head end of the positioning head (14) is provided with a guide groove (144) along the length direction;

the secondary traction wire II (202) is fixedly connected with one sliding sleeve (200), then passes through the other sliding sleeve (200), and finally is fixedly connected with the other main traction wire (5);

the expansion strip (201) is of a thin plate-shaped structure.

2. The method of preparing a vasodilator tube according to claim 1, comprising the steps of:

firstly, respectively carrying out pressurization, heating and blow molding on a hollow pipe by using a mold to prepare a sheath tube (1), a positioning head (14), a hollow tube (141) and a guide wire catheter (30); a spring ring (142) is added in the forming process of the positioning head (14);

step two, preparing a first guide pipe (12) and a second guide pipe (13) by utilizing the pressurization, heating and blow molding of a hollow pipe, adhering and fixing 3 second guide pipes (13) on the outer side of the first guide pipe (12), and finally sleeving the first guide pipe (12) and the second guide pipe (13) in the sheath pipe (1) in a penetrating way and adhering and fixing the first guide pipe (12) and the second guide pipe (13) with the inner wall of the sheath pipe (1);

thirdly, respectively penetrating main traction wires (5) into the guide tubes II (13);

step four, injection molding is carried out on the guide ring I (10), the guide ring II (11) and the first-stage expansion frame (20), and an auxiliary traction wire I (143) and an auxiliary traction wire II (202) are added in the forming process of the guide ring I (10) and the guide ring II (11); then placing a second guide ring (11) in the middle of the first-stage expansion frame (20), penetrating and sleeving the second guide ring (11) and the first-stage expansion frame (20) at the outer side of the sheath tube (1), finally bonding and fixing the second guide ring (11) and the sheath tube, connecting a second auxiliary traction wire (202) with the first-stage expansion frame (20), then putting the second auxiliary traction wire into the sheath tube (1), and connecting the second auxiliary traction wire with one main traction wire (5); sleeving a guide ring I (10) at the end part of the sheath tube (1), bonding and fixing, finally bonding and fixing a positioning head (14) with the end part of the sheath tube (1) through a hollow tube (141), and connecting an auxiliary traction wire I (143) with a spring ring (142), penetrating through the sheath tube (1), and connecting with another main traction wire (5);

fifthly, injection molding of a secondary expansion frame (21), adding a secondary traction wire III (210) in the molding process of the secondary expansion frame (21), installing the secondary expansion frame (21) on the outer side of the primary expansion frame (20), and enabling the secondary traction wire III (210) to penetrate through the sheath tube (1) and then be connected with the last main traction wire (5);

and sixthly, preparing the handheld seat (3) by punching, respectively adhering and fixing the guide wire guide pipe (30) and the sheath pipe (1) on two sides of the handheld seat (3), penetrating a guide wire (4) into the guide pipe I (12) through the guide wire guide pipe (30), and respectively fixedly welding 3 rotating columns (31) on the handheld seat (3) with the other ends of the 3 main traction wires (5).

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