A quick-exchange balloon stent installation device and stent installation method

Abstract

The present invention relates to the technical field of intravascular self-expanding stent delivery, and discloses a rapid exchange balloon stent installation device and a stent installation method. The rapid exchange balloon stent installation device is used to install the self-expanding stent in the diseased part of the blood vessel, and includes a balloon dilatation catheter, a micro guidewire and a stent release tube. The balloon dilatation catheter is provided with a first through hole along the length direction, and a wire threading hole is provided on the side wall of the first through hole; the micro guidewire can enter the first through hole through the distal end of the balloon dilatation catheter and pass through the wire threading hole; the distal end of the balloon dilatation catheter is provided with an expansion part, and the self-expanding stent can be slidably installed in the first through hole, and the self-expanding stent is located at the distal end of the balloon dilatation catheter; the stent release tube is slidably arranged in the first through hole of the balloon dilatation catheter, and the distal end of the stent release tube abuts against the self-expanding stent. By installing the balloon dilatation catheter once, the delivery and installation of the self-expanding stent can be realized, thereby improving the success rate of the operation.

Description

Technical Field

[0001] The present invention relates to the technical field of intravascular self-expanding stent delivery, and in particular to a rapid exchange balloon stent installation device and a stent installation method. Background Art

[0002] Vascular stenosis is a common vascular disease and an important cause and risk factor for ischemic vascular disease. Currently, vascular stent implantation is one of the important technologies for treating vascular stenosis. The implantation of self-expanding stents usually involves pre-dilation with a balloon catheter, and then delivering the stent to the lesion site to release and automatically expand the blood vessel.

[0003] During the current operation, doctors need to first deliver the microcatheter and microguidewire to the lesion site, then remove the microcatheter, insert the balloon catheter to pre-dilate the lesion, then remove the balloon catheter, insert the microcatheter, and then deliver the stent to the lesion site through the microcatheter to release and automatically expand the blood vessel. During the above process, the microcatheter and balloon catheter need to be inserted into the blood vessel alternately multiple times, which is prone to complications and increases the operation time.

[0004] Based on this, there is an urgent need for a quick-exchange balloon stent installation device and a stent installation method to solve the above-mentioned problems. Summary of the invention

[0005] Based on the above, the purpose of the present invention is to provide a rapid exchange balloon stent installation device and a stent installation method, which can realize the delivery and installation of a self-expanding stent by installing a balloon dilatation catheter once to expand the blood vessels, reduce surgical steps, reduce the number of instrument exchanges in the patient's body and the operation time, and improve the success rate of the operation.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In one aspect, a rapid exchange balloon stent installation device is provided, which is used to install a self-expanding stent on a lesion site of a blood vessel, and the rapid exchange balloon stent installation device comprises:

[0008] A balloon dilatation catheter, wherein the balloon dilatation catheter is provided with a first through hole along the length direction, and a wire threading hole is provided on the side wall of the first through hole;

[0009] A micro guide wire, which can enter the first through hole through the distal end of the balloon dilatation catheter and pass through the wire threading hole;

[0010] The distal end of the balloon dilatation catheter is provided with an expansion portion, the self-expanding stent can be slidably installed in the first through hole, and the self-expanding stent is located at the distal end of the balloon dilatation catheter;

[0011] The stent release tube is slidably disposed in the first through hole of the balloon dilatation catheter, and the distal end of the stent release tube abuts against the self-expanding stent.

[0012] As a preferred technical solution for a rapid exchange balloon stent installation device, the proximal end of the balloon dilatation catheter is provided with an inlet, the distal end of the balloon dilatation catheter is provided with an outlet, and the stent release tube is passed through the inlet of the balloon dilatation catheter and is arranged in the first through hole of the balloon dilatation catheter.

[0013] As a preferred technical solution for a rapid exchange balloon stent installation device, the stent release tube is provided with a second through hole along the length direction, and a side wall of the second through hole is provided with an avoidance gap matching the position of the wire threading hole, and the length of the avoidance gap is greater than the length of the self-expanding stent to ensure that the avoidance gap avoids the micro guidewire during the process of the stent release tube pushing out the self-expanding stent.

[0014] As a preferred technical solution for a rapid exchange balloon stent installation device, a first guide wall is flexibly provided on the side of the wire threading hole away from the self-expanding stent, and the first guide wall can be pressed against the side wall of the second through hole, and the first guide wall is used to provide guidance for the micro guidewire.

[0015] As a preferred technical solution for a quick-exchange balloon stent installation device, it also includes a limiting assembly, wherein a first handle is provided at the proximal end of the balloon dilatation catheter, and a second handle is provided at the proximal end of the stent release tube. Two slots are provided inside the limiting assembly at intervals, and a cavity is provided between the two slots. The limiting assembly can be detachably mounted on the first handle and the second handle respectively through the two slots, and a portion of the side wall of the stent release tube is located in the cavity. The spacing between the two slots is not less than the length of the self-expanding stent.

[0016] As a preferred technical solution for a quick-exchange balloon stent installation device, the limit assembly includes two connectable limit blocks, and the side walls of the two limit blocks are provided with relative grooves. After the two limit blocks are spliced ​​together, the relative grooves are spliced ​​into two slots and the cavity.

[0017] As a preferred technical solution for a rapid exchange balloon stent installation device, the side wall of the balloon dilatation catheter includes an inner wall and an outer wall, a fluid channel is arranged between the inner wall and the outer wall, the expansion portion is an expansion membrane connected to the outer wall, the proximal end of the fluid channel is connected to a fluid source, and the distal end of the fluid channel is connected to the expansion membrane.

[0018] As a preferred technical solution of a rapid exchange balloon stent installation device, a developing ring or a developing winding is installed at the distal end of the balloon dilatation catheter;

[0019] A developing ring or a developing winding is installed on the outer side of the self-expanding support.

[0020] As a preferred technical solution of a rapid exchange balloon stent installation device, the stent release tube is inserted into the first through hole of the balloon dilatation catheter through the threading hole;

[0021] A second guide wall is arranged in the first through hole, the second guide wall is arranged obliquely, part of the side wall of the second guide wall is fixed on the side wall of the first through hole, the side wall of the second guide wall close to the wire threading hole is fixed on the wire threading hole, and the second guide wall is inclined in a direction close to the self-expanding stent away from one end of the wire threading hole.

[0022] On the other hand, a stent installation method is provided, using the rapid exchange balloon stent installation device described in any of the above schemes, comprising the following steps:

[0023] Installing the compressed self-expanding stent at the distal end of the balloon dilatation catheter, and installing the stent release tube in the first through hole;

[0024] The micro guide wire enters the first through hole through the distal end of the balloon dilatation catheter and passes through the wire threading hole;

[0025] The balloon dilatation catheter cooperates with the micro guidewire to push the expansion portion of the balloon dilatation catheter to the lesion site;

[0026] The expansion part expands to expand the diseased part;

[0027] The expansion portion contracts and the balloon dilatation catheter is withdrawn until the stent release tube pushes the self-expanding stent out of the first through hole;

[0028] The balloon dilatation catheter and the stent release tube are withdrawn simultaneously.

[0029] The beneficial effects of the present invention are:

[0030] During operation, the compressed self-expanding stent is installed at the distal end of the balloon dilatation catheter, and the stent release tube is installed in the first through hole; the micro-guidewire enters the first through hole through the distal end of the balloon dilatation catheter and passes through the wire hole; the balloon dilatation catheter cooperates with the micro-guidewire to push the expansion part of the balloon dilatation catheter to the lesion site; the expansion part is pressurized positively to expand the lesion site; the expansion part is pressurized negatively to withdraw the balloon dilatation catheter, and at this time the stent release tube slides relative to the balloon dilatation catheter in the first through hole until the stent release tube pushes the self-expanding stent out of the first through hole; after the self-expanding stent is separated from the first through hole, it automatically expands to achieve blood vessel expansion. Then the balloon dilatation catheter and the stent release tube are withdrawn at the same time to complete the delivery and installation of the self-expanding stent. The present invention can realize the delivery and installation of the self-expanding stent by installing the balloon dilatation catheter once, so as to expand the blood vessel, reduce the surgical steps, reduce the number of instrument exchanges in the patient's body and the surgical time, and improve the success rate of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0032] Figure 1 is a cross-sectional view of a rapid exchange balloon stent installation device provided in Embodiment 1 of the present invention;

[0033] Figure 2 yes Figure 1 A local enlarged view at point A;

[0034] Figure 3 is a cross-sectional view of a balloon dilatation catheter provided in Embodiment 1 of the present invention;

[0035] Figure 4 is a cross-sectional view of a first state of installation of the self-expanding stent provided by the first embodiment of the present invention;

[0036] Figure 5 is a cross-sectional view of a second state of installation of the self-expanding stent provided by the first embodiment of the present invention;

[0037] Figure 6 is a cross-sectional view of a rapid exchange balloon stent installation device provided in Embodiment 2 of the present invention;

[0038] Figure 7 is a cross-sectional view of a first state of installation of a self-expanding stent provided by Embodiment 2 of the present invention;

[0039] Figure 8It is a cross-sectional view of the second state of installation of the self-expanding stent provided by the second embodiment of the present invention.

[0040] The following are marked in the figure:

[0041] 100, self-expanding stent; 200, lesion site;

[0042] 1. Balloon dilatation catheter; 11. First through hole; 12. Inlet; 13. Outlet; 14. First guide wall; 15. Second guide wall; 16. First handle; 17. Threading hole; 18. Fluid channel; 19. Expansion part; 191. Expansion membrane; 2. Stent release tube; 21. Second through hole; 22. Avoidance gap; 23. Second handle; 3. Limiting assembly; 31. Limiting block. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0047] Embodiment 1

[0048] During the current operation, doctors need to first deliver the microcatheter and microguidewire to the lesion site, then remove the microcatheter, insert the balloon catheter to pre-dilate the lesion, then remove the balloon catheter, insert the microcatheter, and then deliver the stent to the lesion site through the microcatheter to release and automatically expand the blood vessel. During the above process, the microcatheter and balloon catheter need to be inserted into the blood vessel alternately multiple times, which is prone to complications and increases the operation time.

[0049] To solve the above problems, Figure 1-Figure 5 As shown, this embodiment provides a rapid exchange balloon stent installation device, which includes a balloon dilatation catheter 1, a micro guidewire (not shown in the figure) and a stent release tube 2. It should be noted that the "proximal end" in this embodiment refers to the end close to the operator, and the "distal end" refers to the end away from the operator and close to the lesion site 200.

[0050] Specifically, Figure 1-Figure 3 As shown, the balloon dilatation catheter 1 is provided with a first through hole 11 along the length direction, and a wire threading hole 17 is provided on the side wall of the first through hole 11; the micro guide wire can enter the first through hole 11 through the distal end of the balloon dilatation catheter 1 and pass through the wire threading hole 17; the distal end of the balloon dilatation catheter 1 is provided with an expansion portion 19, and a self-expanding stent 100 can be slidably installed in the first through hole 11, and the self-expanding stent 100 is located at the distal end of the balloon dilatation catheter 1; the stent release tube 2 is slidably set in the first through hole 11 of the balloon dilatation catheter 1, and the distal end of the stent release tube 2 abuts against the self-expanding stent 100.

[0051] During operation, the compressed self-expanding stent 100 is installed at the distal end of the balloon dilatation catheter 1, and the stent release tube 2 is installed in the first through hole 11; the micro-guidewire enters the first through hole 11 through the distal end of the balloon dilatation catheter 1 and passes through the threading hole 17; the balloon dilatation catheter 1 cooperates with the micro-guidewire to push the expansion part 19 of the balloon dilatation catheter 1 to the lesion site 200; the expansion part 19 is pressurized positively to expand the lesion site 200; the expansion part 19 is pressurized negatively, and the balloon dilatation catheter 1 is withdrawn, at which time the stent release tube 2 slides relative to the balloon dilatation catheter 1 in the first through hole 11 until the stent release tube 2 pushes the self-expanding stent 100 out of the first through hole 11; after the self-expanding stent 100 is separated from the first through hole 11, it automatically expands to achieve vascular dilation. Then the balloon dilatation catheter 1 and the stent release tube 2 are withdrawn at the same time to complete the delivery and installation of the self-expanding stent 100. In this embodiment, the balloon dilatation catheter 1 is installed once to achieve the delivery and installation of the self-expanding stent 100 to dilate the blood vessels, reduce the surgical steps, reduce the number of instrument exchanges in the patient's body and the surgical time, and improve the success rate of the surgery.

[0052] Furthermore, the proximal end of the balloon dilatation catheter 1 is provided with an inlet 12 , the distal end of the balloon dilatation catheter 1 is provided with an outlet 13 , and the stent release tube 2 is inserted into the first through hole 11 of the balloon dilatation catheter 1 through the inlet 12 of the balloon dilatation catheter 1 .

[0053] Preferably, a sidewall of the stent release tube 2 is provided with an avoidance gap 22 that matches the position of the wire threading hole 17, and the length of the avoidance gap 22 is greater than the length of the self-expanding stent 100, and the avoidance gap 22 is used to avoid the micro-guidewire. The stent release tube 2 is provided with a second through hole 21 along the length direction, and the micro-guidewire sequentially passes through the outlet 13 of the first through hole 11, the self-expanding stent 100, the second through hole 21 and the avoidance gap 22, and passes through the wire threading hole 17, so as to enable the micro-guidewire to guide the balloon dilatation catheter 1. In this embodiment, when the balloon dilatation catheter 1 is withdrawn, the stent release tube 2 slides relative to the balloon dilatation catheter 1 to push out the self-expanding stent 100. In this process, in order to prevent the sidewall of the stent release tube 2 from interfering with the micro-guidewire, the length of the avoidance gap 22 needs to be greater than the length of the self-expanding stent 100, so as to ensure that the sidewall of the stent release tube 2 does not touch the micro-guidewire during the process of the stent release tube 2 pushing out the stent.

[0054] More preferably, if Figure 1-Figure 3As shown, a first guide wall 14 is provided on the side of the threading hole 17 away from the self-expanding stent 100, and the first guide wall 14 is used to provide guidance for the micro-guidewire; a sidewall of the stent release tube 2 is provided with an avoidance gap 22 that matches the position of the threading hole 17, and the length of the avoidance gap 22 is greater than the length of the self-expanding stent 100, and the avoidance gap 22 is used to avoid the first guide wall 14 and the micro-guidewire. In this embodiment, the first guide wall 14 and the balloon dilatation catheter 1 are made of flexible materials, and the end of the first guide wall 14 can be flexibly arranged on the threading hole 17. When the stent release tube 2 is assembled, the stent release tube 2 enters the first through hole 11 through the inlet 12 of the balloon dilatation catheter 1. When passing through the threading hole 17, the first guide wall 14 can be deformed in a direction away from the first through hole 11, so that the stent release tube 2 continues to move toward the distal end. After the stent release tube 2 is installed, the first guide wall 14 automatically rebounds, sinks inward and abuts against the inner wall of the second through hole 21, and the end of the first guide wall 14 away from the wire-threading hole 17 is inclined toward the direction close to the self-expanding stent 100. When the micro-guidewire is assembled, it enters the first through hole 11 through the outlet 13, and when passing through the wire-threading hole 17, the first guide wall 14 provides a guiding effect for the micro-guidewire, preventing the micro-guidewire from moving toward the proximal side of the second through hole 21 after entering through the wire-threading hole 17, thereby ensuring the correct delivery direction of the micro-guidewire.

[0055] Further preferably, in this embodiment, if Figure 1 , Figure 4 and Figure 5 As shown, the rapid exchange balloon stent installation device also includes a limit assembly 3, a first handle 16 is provided at the proximal end of the balloon dilatation catheter 1, a second handle 23 is provided at the proximal end of the stent release tube 2, two slots are arranged in the limit assembly 3, a cavity is arranged between the two slots, and the limit assembly 3 is detachably mounted on the first handle 16 and the second handle 23 through the two slots, a part of the side wall of the stent release tube 2 is located in the cavity, and the spacing between the two slots is not less than the length of the self-expanding stent 100. The limit assembly 3 is installed on the first handle 16 and the second handle 23, and in the process of the balloon dilatation catheter 1 entering the blood vessel, the balloon dilatation catheter 1 and the stent release tube 2 are ensured to remain relatively still, and the stent release tube 2 is prevented from sliding relative to the balloon dilatation catheter 1, and the self-expanding stent 100 is pushed out in advance. When the expansion part 19 of the balloon dilatation catheter 1 reaches the lesion site 200, the limit assembly 3 is disassembled, and the balloon dilatation catheter 1 is withdrawn. Since the stent release tube 2 remains stationary, the stent release tube 2 can push out the self-expanding stent 100. The distance between the two slots is not less than the length of the self-expanding stent 100 to prevent the stent release tube 2 and the balloon dilatation catheter 1 from sliding relative to each other insufficiently, thereby preventing the self-expanding stent 100 from being completely pushed out.

[0056] Preferably, the limit assembly 3 includes two limit blocks 31 that can be spliced, and the side walls of the two limit blocks 31 are provided with opposite grooves. After the two limit blocks 31 are spliced, the opposite grooves are spliced ​​into two slots and a cavity. The two limit blocks 31 are assembled in a splicing manner, and the first handle 16 and the second handle 23 provide positioning for the assembly of the two limit blocks 31, which is simple to operate, easy to disassemble and assemble, and highly practical.

[0057] Preferably, the side wall of the balloon dilatation catheter 1 includes an inner wall and an outer wall, a fluid channel 18 is provided between the inner wall and the outer wall, the expansion portion 19 is an expansion membrane 191 connected to the outer wall, the proximal end of the fluid channel 18 is connected to the fluid source, and the distal end of the fluid channel 18 is connected to the expansion membrane 191. When the fluid source releases the fluid, the fluid in the expansion membrane 191 increases, positive pressure is generated, and the expansion membrane 191 expands outward to expand the lesion 200; when the fluid source recovers the fluid, the fluid in the expansion membrane 191 decreases, negative pressure is generated, and the expansion membrane 191 retracts, which facilitates the withdrawal of the balloon dilatation catheter 1. In this embodiment, the fluid released by the fluid source is liquid. Of course. In other embodiments, the fluid can also be a gas.

[0058] Furthermore, in order to facilitate the operator to understand the distal position of the balloon dilatation catheter 1 and the position of the self-expanding stent 100 in the blood vessel, a developing ring or a developing winding is installed at the distal end of the balloon dilatation catheter 1, and a developing ring or a developing winding is also installed on the outside of the self-expanding stent 100. Under the radiation, the distal position of the balloon dilatation catheter 1 can be understood by the instrument, and the position and state of the self-expanding stent 100 can be detected by the instrument. Among them, the developing ring can be fixed by bonding, and the developing winding can be fixed by winding.

[0059] This embodiment also provides a bracket installation method, comprising the following steps:

[0060] Step 1: Install the compressed self-expanding stent 100 at the distal end of the balloon dilatation catheter 1, and install the stent release tube 2 in the first through hole 11;

[0061] Step 2: The micro-guidewire enters the first through hole 11 through the distal end of the balloon dilatation catheter 1 and passes through the wire threading hole 17;

[0062] Step 3: The balloon dilatation catheter 1 cooperates with the micro-guidewire to push the expansion portion 19 of the balloon dilatation catheter 1 to the lesion site 200;

[0063] Step 4: the expansion part 19 expands to expand the diseased part 200;

[0064] Step 5: The expansion portion 19 contracts, and the balloon dilatation catheter 1 is withdrawn until the stent release tube 2 pushes the self-expanding stent 100 out of the first through hole 11;

[0065] Step six: withdraw the balloon dilatation catheter 1 and the stent release tube 2 simultaneously to complete the installation operation of the self-expanding stent 100 .

[0066] Furthermore, when the limiting assembly 3 is used, in step two, after the stent release tube 2 is installed in the first through hole 11, the limiting assembly 3 is installed on the first handle 16 and the second handle 23 to improve the stability of the delivery of the balloon dilatation catheter 1; in step five, after the expansion part 19 is contracted, the limiting assembly 3 is removed.

[0067] Embodiment 2

[0068] This embodiment also provides a rapid exchange balloon stent installation device. The difference between this embodiment and the first embodiment is that the installation method of the stent release tube 2 is different from that of the first embodiment. Figure 6-Figure 8 As shown, in this embodiment, the stent release tube 2 is inserted into the first through hole 11 of the balloon dilatation catheter 1 through the threading hole 17, and the stopper assembly 3 in the first embodiment is eliminated. In this embodiment, the first guide wall 14 of the balloon dilatation catheter 1 in the first embodiment is replaced with a second guide wall 15, the second guide wall 15 is tilted, part of the side wall of the second guide wall 15 is fixed to the side wall of the first through hole 11, the side wall of the second guide wall 15 close to the threading hole 17 is fixed to the threading hole 17, and the end of the second guide wall 15 away from the threading hole 17 is tilted toward the direction close to the self-expanding stent 100.

[0069] During operation, the compressed self-expanding stent 100 is installed at the distal end of the balloon dilatation catheter 1, and the micro-guidewire can enter the first through hole 11 through the distal end of the balloon dilatation catheter 1 and pass through the threading hole 17; the balloon dilatation catheter 1 cooperates with the micro-guidewire to push the expansion part 19 of the balloon dilatation catheter 1 to the lesion site 200; the expansion part 19 is pressurized positively to expand the lesion site 200; the expansion part 19 is pressurized negatively to shrink the expansion part 19. Then the stent release tube 2 enters the first through hole 11 through the threading hole 17 using the micro-guidewire until the distal end of the stent release tube 2 abuts against the self-expanding stent 100, and then the balloon dilatation catheter 1 is withdrawn, at which time the stent release tube 2 slides relative to the balloon dilatation catheter 1 in the first through hole 11 until the stent release tube 2 pushes the self-expanding stent 100 out of the first through hole 11; after the self-expanding stent 100 is separated from the first through hole 11, it automatically expands to achieve vascular dilation. Then, the balloon dilatation catheter 1 and the stent release tube 2 are withdrawn simultaneously to complete the delivery and installation of the self-expanding stent 100 .

[0070] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A rapid exchange balloon stent installation device, used to install a self-expanding stent (100) on a lesion site (200) of a blood vessel, characterized in that: The rapid exchange balloon stent installation device comprises: A balloon dilatation catheter (1), wherein the balloon dilatation catheter (1) is provided with a first through hole (11) along the length direction, and a wire threading hole (17) is provided on the side wall of the first through hole (11); A micro guide wire, wherein the micro guide wire can enter the first through hole (11) through the distal end of the balloon dilatation catheter (1) and pass through the wire threading hole (17); The distal end of the balloon dilatation catheter (1) is provided with an expansion portion (19), the self-expanding stent (100) can be slidably installed in the first through hole (11), and the self-expanding stent (100) is located at the distal end of the balloon dilatation catheter (1); a stent release tube (2) which is slidably disposed in the first through hole (11) of the balloon dilatation catheter (1), and the distal end of the stent release tube (2) abuts against the self-expanding stent (100); The stent release tube (2) is provided with a second through hole (21) along the length direction, and a side wall of the second through hole (21) is provided with an avoidance notch (22) matching the position of the wire threading hole (17), and the length of the avoidance notch (22) is greater than the length of the self-expanding stent (100), so as to ensure that the avoidance notch (22) avoids the micro-guide wire when the stent release tube (2) pushes out the self-expanding stent (100); The rapid exchange balloon stent installation device further comprises: a limiting assembly (3), a first handle (16) is arranged at the proximal end of the balloon dilatation catheter (1), a second handle (23) is arranged at the proximal end of the stent release tube (2), two slots are arranged in the limiting assembly (3), a cavity is arranged between the two slots, the limiting assembly (3) is detachably mounted on the first handle (16) and the second handle (23) through the two slots, a part of the side wall of the stent release tube (2) is located in the cavity, and the distance between the two slots is not less than the length of the self-expanding stent (100); The limiting assembly (3) comprises two limit blocks (31) that can be spliced ​​together. The side walls of the two limit blocks (31) are both provided with opposite grooves. After the two limit blocks (31) are spliced ​​together, the opposite grooves are spliced ​​into two slots and the cavity.

2. The rapid exchange balloon stent installation device according to claim 1, characterized in that: The proximal end of the balloon dilatation catheter (1) is provided with an inlet (12), the distal end of the balloon dilatation catheter (1) is provided with an outlet (13), and the stent release tube (2) is inserted into the first through hole (11) of the balloon dilatation catheter (1) through the inlet (12) of the balloon dilatation catheter (1).

3. The rapid exchange balloon stent installation device according to claim 1, characterized in that: A first guide wall (14) is flexibly provided on the side of the wire threading hole (17) away from the self-expanding stent (100), and the first guide wall (14) can be pressed against the side wall of the second through hole (21), and the first guide wall (14) is used to provide guidance for the micro guide wire.

4. The rapid exchange balloon stent installation device according to claim 1, characterized in that: The side wall of the balloon dilatation catheter (1) includes an inner wall and an outer wall, a fluid channel (18) is provided between the inner wall and the outer wall, the expansion portion (19) is an expansion membrane (191) connected to the outer wall, the proximal end of the fluid channel (18) is connected to a fluid source, and the distal end of the fluid channel (18) is connected to the expansion membrane (191).

5. The rapid exchange balloon stent installation device according to claim 1, characterized in that: The distal end of the balloon dilatation catheter (1) is provided with a developing ring; A developing ring is installed on the outer side of the self-expanding stent (100).

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