Device for treating bifurcated vascular stenosis

Abstract

The invention provides a device for treating bifurcated vascular stenosis, and belongs to the technical field of interventional surgical instruments. The device comprises a Y-shaped stent, a conveying sheath tube and a stent conveying unit, the Y-shaped stent is provided with a main body part and two branch parts, and the two branch parts are arranged on the two radial sides of one end of the main body part; the conveying sheathing canal is used for establishing an access along a blood vessel so as to guide a treatment instrument to reach a diseased region; the stent conveying unit is used for conveying a compressed Y-shaped stent to a diseased region along a conveying sheath tube at a time and releasing the Y-shaped stent, two branch parts of the Y-shaped stent are used for supporting a far-end part and a bifurcated part of a main blood vessel respectively, and a main body part of the Y-shaped stent is used for supporting a near-end part of the main blood vessel; the stent is mainly used for solving the technical problems that in the prior art, when bifurcated vascular stenosis is treated, step-by-step release operation of a plurality of stents is tedious, the surgical risk is high, and vascular restenosis is likely to be caused due to the fact that the stent overstimulates blood vessels from overlapping.

Description

Technical Field

[0001] The present invention belongs to the technical field of interventional surgical instruments, and in particular relates to a device for treating bifurcated blood vessel stenosis. Background Art

[0002] Within the cerebral vascular system, it's common for both the main and branch vessels at bifurcations to narrow simultaneously. For such bifurcations, a single stent placement strategy often fails to adequately cover the branch vessels, potentially leading to branch occlusion or restenosis. Therefore, simultaneous stent placement in both the main and branch vessels is often necessary.

[0003] like Figure 1 As shown, the bifurcated blood vessel 1 has a proximal portion 11 and a distal portion 12 of the main blood vessel and a bifurcated portion 13 along the main blood vessel, wherein there are thrombus deposits 2 on the proximal portion 11, the distal portion 12 and the bifurcated portion 13 of the main blood vessel. The presence of the thrombus deposits 2 causes the diameter of the blood vessel lumen to shrink, affecting the normal circulation of blood. In order to treat the proximal portion 11, the distal portion 12 and the bifurcated portion 13 at the same time, it is generally necessary to release two stents 3. The distal ends of the two stents 3 support the blood vessels of the bifurcated portion 13 and the distal portion 12, and the proximal ends are overlapped. This stent arrangement has the following problems: first, the two stents need to be released in steps, and one of the stents needs to be accurately positioned and released first. At this time, it is necessary to ensure that the stent completely covers the lesion site and does not affect the subsequent operation of the other blood vessel branch. Once the position is not good, readjustment will increase the risk of vascular damage; when releasing the second stent, it is necessary to ensure that it is accurately connected with the released stent to avoid gaps or excessive overlap. During this process, doctors need to constantly adjust the position of the guidewire, balloon, and stent, and perform repeated angiography for confirmation, which is an extremely cumbersome process. In addition, during the step-by-step release process, the released stent may be displaced or deformed due to subsequent operations, or cause vascular spasm, interfering with the smooth placement of subsequent stents, further increasing the uncertainty and difficulty of the operation. Secondly, the overlapping part of the two stents causes much more mechanical stimulation and damage to the blood vessel wall than a single stent. During the expansion of the stent, it will excessively squeeze the vascular endothelium, destroy the integrity of the vascular endothelium, activate the vascular repair mechanism, and promote abnormal proliferation of the endothelium. Excessive proliferation of the endothelium can easily lead to restenosis of the blood vessel, affecting the long-term patency of the stent and shortening the service life of the stent. The patient may need another surgical intervention.

[0004] Therefore, it is necessary to provide an improved technical solution to the above-mentioned deficiencies in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for treating bifurcation vascular stenosis, so as to solve the technical problems in the prior art of treating bifurcation vascular stenosis, such as the cumbersome step-by-step release of multiple stents, high surgical risks, and the excessive stimulation of the blood vessels by overlapping stents, which can easily lead to restenosis of the blood vessels.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A device for treating bifurcated blood vessel stenosis, comprising:

[0008] A Y-shaped bracket, the Y-shaped bracket having a main body and two branch parts, the two branch parts are arranged on both radial sides of one end of the main body;

[0009] A delivery sheath, which is used to establish a pathway along a blood vessel to guide a therapeutic device to a lesion site;

[0010] The stent delivery unit is used to deliver the compressed Y-shaped stent to the lesion site along the delivery sheath at one time and release the Y-shaped stent. The two branch parts of the Y-shaped stent are used to support the distal part and the bifurcation part of the main blood vessel respectively, and the main part is used to support the proximal part of the main blood vessel.

[0011] As a further optimized technical solution, the stent delivery unit includes:

[0012] A delivery microcatheter, the delivery microcatheter being used to hold the compressed Y-shaped stent, the delivery microcatheter having two branch catheters at the distal end, each branch catheter being used to hold a compressed branch portion;

[0013] Two guide wires are arranged along the delivery microcatheter, the distal end of one guide wire extending along one of the branch catheters for guiding the branch catheter to the distal end of the main vessel, and the other guide wire extending along the other branch catheter for guiding the branch catheter to the bifurcation of the main vessel;

[0014] The delivery microcatheter is provided with a release structure for simultaneously releasing the two branch parts of the Y-shaped stent.

[0015] As a further optimized technical solution, the release structure is a release port opened on the two branch catheters. The delivery microcatheter is elastic. A limiting structure is provided on the release port to block the release port when the Y-type stent is delivered. When the Y-type stent is delivered, the limiting structure limits the Y-type stent in the branch catheter. When the Y-type stent is released, the limiting structure is removed and the delivery microcatheter is pulled toward the proximal end. The width of the release port is increased to release the internal branch part.

[0016] As a further optimized technical solution, the release openings on the two branch parts are symmetrically arranged and both extend axially along the branch parts, and the proximal ends of the two release openings are connected.

[0017] As a further optimized technical solution, the release openings on the two branch parts are arranged opposite to each other and both extend axially along the branch part, and the proximal ends of the two release openings are connected.

[0018] As a further optimized technical solution, the limiting structure is a biodegradable polymer film.

[0019] As a further optimized technical solution, the width of the limiting structure is greater than the width of the release opening, and two sides of the limiting structure are fixedly arranged on both sides of the release opening.

[0020] As a further optimized technical solution, one end of the two branch parts is respectively hinged to the main body part to adjust the angle between the two branch parts.

[0021] As a further optimized technical solution, the distal end faces of the two branch parts of the Y-shaped stent are arranged perpendicular to the axial direction, and the proximal end faces form a set angle with the axial direction.

[0022] As a further optimized technical solution, the angle formed by the proximal end faces of the two branch parts and the generatrix of the hinge position is an acute angle.

[0023] Beneficial effects:

[0024] The present invention realizes the one-time stent release of the stenosis part of the bifurcated blood vessel through the Y-shaped stent and the matching stent delivery unit. Compared with the prior art method of releasing multiple separate stents in steps, there is no need to adjust the position of the delivery device and the stent multiple times, which reduces the steps of repeatedly confirming the position, effectively simplifies the surgical operation process, and at the same time avoids the influence of the stent released later on the released stent during the step-by-step release process, reduces the surgical risk, and improves the success rate and safety of the operation.

[0025] In addition, the two branch parts of the Y-shaped stent of the present invention are respectively used to support the distal part and the bifurcation part of the main blood vessel, and the main part is used to support the proximal part of the main blood vessel, thereby avoiding excessive mechanical stimulation and damage to the blood vessel wall caused by overlapping multiple stents, reducing the squeezing of the vascular endothelium, protecting the integrity of the vascular endothelium, and effectively inhibiting abnormal proliferation of the endothelium, thereby reducing the chance of restenosis of the blood vessel, extending the service life of the stent, and reducing the possibility of re-surgical intervention for the patient.

[0026] Furthermore, the hinged connection design between the main part and the branch part of the Y-shaped stent allows the branch part to adjust the angle with the main part, which can better adapt to bifurcated blood vessels of different shapes, ensure that the stent fits tightly against the blood vessel wall, and fully cover and effectively support the diseased area, thereby improving the treatment effect of bifurcated blood vessel stenosis and ensuring normal blood circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings and the accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. Among them:

[0028] Figure 1 This is the arrangement method of stents at bifurcated blood vessels in the prior art;

[0029] Figure 2 This is a schematic diagram of the remote structure of an embodiment of the present invention;

[0030] Figure 3 A front view of a Y-shaped bracket according to an embodiment of the present invention;

[0031] Figure 4 A top view of a Y-shaped bracket according to an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the distal end structure of a delivery microcatheter according to an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the first state during the release process of a Y-shaped stent according to an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of a second state during the release process of a Y-shaped stent according to an embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of a third state during the release process of a Y-shaped stent according to an embodiment of the present invention;

[0036] Figure 9 This is a schematic diagram of the fourth state of the Y-shaped stent during the release process according to an embodiment of the present invention;

[0037] Figure 10 This is a schematic diagram of the remote structure of another embodiment of the present invention.

[0038] In the figure: 1. bifurcated vessel; 11. proximal part; 12. distal part; 13. bifurcated part; 2. thrombus deposit; 3. stent; 100. Y-shaped stent; 110. main part; 120. branch part; 121. distal end face; 122. proximal end face; 200. delivery sheath; 300. delivery microcatheter; 310. branch catheter; 311. release structure; 312. limiting structure; 400. guide wire; 500. annular structure; 600. support tube; 610. limiting ring. DETAILED DESCRIPTION

[0039] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0040] In the description of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through an intermediate component. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. In addition, the term "proximal end" refers to the end close to the operator, and "distal end" refers to the end away from the operator.

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0042] The shapes and sizes of the components in the drawings do not reflect the actual proportions of the products, and are only intended to illustrate the contents of the present invention.

[0043] The present invention provides a device for treating bifurcated vessel stenosis. It addresses the issues of complex operation, high risk, and susceptibility to restenosis in the step-by-step release of multiple stents in traditional bifurcated vessel stenosis treatment, and conceives an integrated treatment solution. A Y-shaped stent is used to replace multiple independent stents. The hinged structure of its main body and branch parts can flexibly adapt to bifurcated vessels of different shapes. The delivery microcatheter cooperates with the guide wire to achieve precise positioning, and the release port with a biodegradable coating limiting structure ensures that the Y-shaped stent can be stably delivered and smoothly released. Through the coordinated operation of various components, the surgical process is simplified, damage to blood vessels is reduced, and the treatment effect is improved, fundamentally improving the treatment method for bifurcated vessel stenosis.

[0044] Example 1

[0045] like Figure 2 As shown, the device for treating bifurcated blood vessel stenosis includes a Y-shaped stent 100, a delivery sheath 200 and a stent delivery unit.

[0046] like Figure 3 、 Figure 4 As shown, the Y-shaped stent 100 is entirely made of medical nickel-titanium alloy. Leveraging its superelasticity and shape memory properties, it maintains its expanded state at room temperature and can be compressed and deformed at low temperatures. The Y-shaped stent 100 comprises an integrally arranged main body 110 and two branch portions 120, which are arranged radially on either side of one end of the main body 110.

[0047] In this embodiment, the two branch parts 120 are hingedly arranged on the main part 110 through a movable annular structure 500. The hinged arrangement of the branch part 120 and the main part 110 can make the stent as a whole applicable to bifurcated blood vessels 1 with different bifurcation angles, thereby expanding the scope of use of the stent. Compared with the method of specially customizing a stent according to blood vessels with different bifurcation angles, the processing cost is effectively reduced. In addition, the branch part 120 can automatically adjust the angle according to the pressure of the blood vessel wall after release. The angle (the angle between the axial direction of the branch part 120 and the main part 110) is adjusted in the range of 30°-90° to better fit the bifurcated blood vessels 1 with different shapes. In the later stage, it will automatically adapt to the changes in the blood vessels as the disease is treated or the patient's body changes, thereby enhancing the adaptability to the vascular status of different patients and different treatment stages, and improving the continuity and effectiveness of the treatment. In addition, compared with the Y-shaped stent 100 which is fixed as a whole and relies only on the elasticity of the material to adjust the angle within a limited range, the design of the two branch parts 120 being hinged to the main part 110 can achieve an ideal fitting state when facing a complex bifurcated blood vessel 1 with large angle changes. There is no excessive stress stimulation on the blood vessel caused by the deformation of the stent, which improves the treatment effect and application range.

[0048] The delivery sheath 200 utilizes a three-layer composite structure: an inner layer of hydrophilic coating to reduce friction between the device and the tube wall; a middle layer of braided stainless steel wire reinforcement to provide excellent support and pushability; and an outer layer of anti-thrombotic coating to reduce the risk of thrombosis. The delivery sheath 200 establishes a pathway along the blood vessel, passing through the puncture site and gradually advancing along the vessel to the affected area, providing a stable delivery channel for subsequent treatment devices.

[0049] The stent delivery unit is used to deliver the compressed Y-shaped stent 100 to the lesion site along the delivery sheath 200 at one time, and release the Y-shaped stent 100. The two branch parts 120 of the Y-shaped stent 100 are used to support the distal part 12 and the bifurcation part 13 of the main blood vessel respectively, and the main part 110 is used to support the proximal part 11 of the main blood vessel.

[0050] In this embodiment, the stent delivery unit includes a delivery microcatheter 300 and a guide wire 400 .

[0051] The delivery microcatheter 300 is made of elastic polyurethane material and has two branch conduits 310 at its distal end. Each branch conduit 310 has a circular internal cross-section and is used to hold a compressed branch portion 120. A release structure 311 is provided on the delivery microcatheter 300 for simultaneously releasing both branches 120 of the Y-shaped stent 100. In this embodiment, the release structure 311 is a release port provided on each branch conduit 310. During delivery of the Y-shaped stent 100, due to the elastic contraction of the delivery microcatheter 300, the width of the release port is smaller than the compressed size of the branch portion 120, thereby ensuring that the branches 120 of the Y-shaped stent 100 are largely retained in place by the branch conduits 310. However, during delivery of the Y-shaped stent 100 into the body, it may expand and deform slightly due to the influence of the patient's body temperature. To ensure that the stent is securely in place, a retaining structure 312 is provided on the release port to block the release port during delivery and release the retaining structure when the Y-shaped stent 100 is released. like Figure 5 As shown, in this embodiment, the retaining structure 312 is a biodegradable polymer coating. The width of the biodegradable polymer coating is greater than the width of the release port. During delivery, the two sides of the coating are tightly attached to the release port through heat pressing. During stent release, the coating gradually dissolves under the influence of human body temperature and blood flow, allowing the branch portion 120 to be released through the release port.

[0052] When the Y-shaped stent 100 reaches the predetermined position, the distal end of the delivery microcatheter 300 has been separated from the delivery sheath 200 and extended into the blood vessel, and is fully exposed to the blood. Under the cumulative stimulation of body temperature, the biodegradable polymer coating gradually dissolves, thereby releasing the blockage of the release port. The specific biodegradable polymer coating has a plurality of specifications with different thicknesses. The thicker biodegradable polymer coating requires a longer dissolution time, and is therefore suitable for more complex surgeries. This can fully ensure that the stent can be stably confined in the branch catheter 310 before being delivered into place. By the same token, the thinner biodegradable polymer coating is easier to dissolve, and is therefore suitable for simpler surgeries. This can avoid waiting too long for the stent to dissolve and release the stent, thereby ensuring the efficiency of the surgery. After the biodegradable polymer coating dissolves, the branch portion 120 begins to further fully expand automatically. When the deformation force of the expansion is greater than the elastic contraction force of the branch catheter 310, the release port is stretched open, and part of the branch portion 120 enters the blood vessel from the release port. At this time, the operator cooperates to pull the delivery microcatheter 300 proximally, and the delivery microcatheter 300 further undergoes elastic deformation, and the width of the release port further increases, thereby gradually and completely releasing the internal branch portion 120.

[0053] The core wire of the guide wire 400 is made of nickel-titanium alloy and coated with polytetrafluoroethylene, which provides excellent flexibility and maneuverability. The distal end of one guide wire 400 extends along one of the branch catheters 310 to guide it to the distal portion 12 of the main vessel. The other guide wire 400 extends along the other branch catheter 310 to guide it to the bifurcation 13 of the main vessel.

[0054] Furthermore, the release ports on the two branch portions 120 are symmetrically arranged and both extend axially along the branch portions 120. In this way, when the delivery microcatheter 300 is pulled to increase the width of the release port, the two branch portions 120 can be simultaneously disengaged from the release port, avoiding the situation where the stent is twisted, deformed or released asynchronously due to uneven force. This stability and synchronization helps the stent to accurately deploy to a predetermined shape within the blood vessel, accurately fit the structure of the bifurcated blood vessel, and ensure effective support for the lesion. At the same time, in order to avoid interfering with the release of the main body 110, the proximal ends of the release ports on the two branch portions 120 are connected to each other. Preferably, the release ports on the two branch portions 120 are arranged relative to each other, that is, the release ports on the two branch portions 120 are both arranged on the inner side.

[0055] Furthermore, the distal end faces 121 of the two branch parts 120 of the Y-shaped stent 100 are arranged perpendicular to the axial direction, so that the distal end of the Y-shaped stent 100 can form a large-area, stable contact with the blood vessel wall, thereby preventing the distal end of the stent from shifting. The proximal end face 122 of the Y-shaped stent 100 forms a set angle with the axial direction. Preferably, the angle formed by the proximal end faces 122 of the two branch parts 120 and the busbar of the hinge position is an acute angle. In this way, when the branch part 120 adjusts the angle with the main part 110 according to the morphology of the blood vessel, it can effectively prevent the proximal ends from interfering with each other. This allows the stent to flexibly adapt to blood vessels with different bifurcation angles. Whether it is a compact bifurcation with a smaller angle or an open bifurcation with a larger angle, the branch part 120 can be freely rotated to the appropriate position to ensure the precise adaptation of the stent to the blood vessel and improve the effectiveness and reliability of the treatment.

[0056] Specifically, during the operation, the Y-shaped stent 100 first needs to be immersed in low-temperature physiological saline, and the two branch parts 120 are compressed and respectively placed into the two branch catheters 310 of the delivery microcatheter 300 by utilizing the low-temperature deformable properties of nickel-titanium alloy. At this time, check whether the biodegradable polymer coating (limiting structure 312) on the release port completely covers the release port, and ensure that the biodegradable polymer coating fits tightly to the edge of the release port to prevent the Y-shaped stent 100 from being accidentally released during delivery. According to the angiography results of the patient's blood vessels, select a delivery sheath 200 of appropriate specifications. Check whether the three-layer composite structure of the delivery sheath 200 is intact, especially whether the hydrophilic coating, braided stainless steel wire reinforcement layer and anti-thrombotic coating are damaged or defective. Assemble the delivery sheath 200 with the matching puncture needle, dilator and other instruments to ensure a tight connection without looseness.

[0057] During the procedure, a puncture needle is used to puncture the blood vessel. Once successful, a guidewire is introduced and a dilator is advanced into the vessel along the guidewire, gradually expanding the puncture channel. Subsequently, the delivery sheath 200 is slowly advanced along the guidewire to the vicinity of the diseased vessel. Angiography is then used to reconfirm the position of the delivery sheath 200 to ensure that its distal end has reached the appropriate diseased vessel segment, providing a stable channel for subsequent stent delivery.

[0058] like Figure 6 As shown, the delivery microcatheter 300 with the pre-installed Y-shaped stent 100 is delivered into the blood vessel along the delivery sheath 200. Under the real-time monitoring of angiography, the two branch catheters 310 are guided to the predetermined positions by manipulating the two guide wires 400. Figure 7As shown, one guide wire 400 guides the corresponding branch catheter 310 to the distal portion 12 of the main vessel, while another guide wire 400 guides the other branch catheter 310 to the bifurcation 13 of the main vessel. During this process, the excellent flexibility and maneuverability of the guide wire 400, combined with the angiographic images, precisely adjust the position and direction of the delivery microcatheter 300, ensuring that the main portion 110 and the two branch portions 120 of the Y-shaped stent 100 accurately align with the diseased blood vessel.

[0059] like Figure 8 As shown, when the Y-shaped stent 100 reaches the predetermined position, the biodegradable polymer coating on the release port begins to gradually degrade, and the two branch parts 120 of the Y-shaped stent 100 are gradually released and unfolded from the release port under the superelastic action of the nickel-titanium alloy. Then the delivery microcatheter 300 is pulled toward the proximal end through the in vitro operating handle. Since the delivery microcatheter 300 is made of elastic polyurethane material, it undergoes elastic deformation during the pulling process, and the width of the release port on the two branch catheters 310 gradually increases. As the stent is released, the two branch parts 120 respectively support the distal part 12 and the bifurcation part 13 of the main blood vessel, and the main body part 110 supports the proximal part 11 of the main blood vessel, as shown in FIG. Figure 9 During this process, the hinge automatically adjusts the angle of the branch portion 120 according to the pressure of the blood vessel wall, so that the stent can better fit the blood vessel wall.

[0060] Example 2

[0061] like Figure 10 As shown, the main difference between this embodiment and embodiment 1 lies in the structural design of the stent delivery unit. In this embodiment, a support tube 600 for supporting and gripping the stent is further provided in the delivery microcatheter 300 of the stent delivery unit. The distal end of the support tube 600 extends to the branch catheter 310 portion close to the delivery microcatheter 300 and is only used to support the main part 110 of the Y-shaped stent 100. The support tube 600 has a lumen, and the guide wire 400 is arranged through the lumen of the support tube 600. A limiting ring 610 for abutting the proximal end of the main part 110 is fixedly provided on the outer wall of the support tube 600. The purpose of this design is that after the Y-shaped stent 100 is delivered into place, there is no need to wait for the branch part 120 to expand automatically. By keeping the support tube 600 in place, the delivery microcatheter 300 is directly pulled toward the proximal end. Under the action of the limiting ring 610, the Y-shaped stent 100 is retained on the support tube 600, so that the Y-shaped stent 100 directly squeezes the release port, causing the release port to deform and gradually released from the release port. Compared with Example 1, the time waiting for the branch part 120 to expand automatically is shortened, effectively improving the surgical efficiency.

[0062] In summary, the device for treating bifurcation vascular stenosis provided by the present invention effectively solves the difficulties in the prior art through innovative structural design and detailed implementation methods, and has significant clinical application value and broad market prospects.

[0063] It will be understood that the above description is merely exemplary and the embodiments of the present application do not limit this.

[0064] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A device for treating bifurcated blood vessel stenosis, characterized in that: include: A Y-shaped bracket (100), comprising a main body (110) and two branch parts (120), wherein the two branch parts (120) are arranged on both radial sides of one end of the main body (110); A delivery sheath (200), the delivery sheath (200) is used to establish a pathway along a blood vessel to guide a therapeutic device to a lesion site; A stent delivery unit is provided, wherein the stent delivery unit is used to deliver a compressed Y-shaped stent (100) to a lesion site along a delivery sheath (200) at one time, and to release the Y-shaped stent (100), wherein the two branch parts (120) of the Y-shaped stent (100) are used to support the distal part (12) and the bifurcation part (13) of the main blood vessel respectively, and the main body part (110) is used to support the proximal part (11) of the main blood vessel.

2. The device for treating bifurcation vascular stenosis according to claim 1, characterized in that: The stent delivery unit comprises: A delivery microcatheter (300), wherein the delivery microcatheter (300) is used to hold the compressed Y-shaped stent (100), and the distal end of the delivery microcatheter (300) is provided with two branch catheters (310), each branch catheter (310) being used to hold a compressed branch portion (120); Two guide wires (400) are arranged along the transport microcatheter (300), the distal end of one guide wire (400) extending along one of the branch catheters (310) for guiding the branch catheter (310) to the distal end portion (12) of the main blood vessel, and the other guide wire (400) extending along the other branch catheter (310) for guiding the branch catheter (310) to the bifurcation portion (13) of the main blood vessel; The delivery microcatheter (300) is provided with a release structure (311) for simultaneously releasing the two branch portions (120) of the Y-shaped stent (100).

3. The device for treating bifurcation vascular stenosis according to claim 2, characterized in that: The release structure (311) is a release port opened on two branch catheters (310). The transport microcatheter (300) is elastic. A limiting structure (312) is provided on the release port to block the release port when the Y-shaped stent (100) is transported. When the Y-shaped stent (100) is transported, the limiting structure (312) limits the Y-shaped stent (100) in the branch catheter (310). When the Y-shaped stent (100) is released, the limiting structure (312) is removed and the transport microcatheter (300) is pulled toward the proximal end. The width of the release port increases to release the internal branch part (120).

4. The device for treating bifurcation vascular stenosis according to claim 3, characterized in that: The release ports on the two branch portions (120) are symmetrically arranged and both extend axially along the branch portion (120), and the proximal ends of the two release ports are connected.

5. The device for treating bifurcation vascular stenosis according to claim 3, characterized in that: The release ports on the two branch portions (120) are arranged opposite to each other and both extend axially along the branch portion (120), and the proximal ends of the two release ports are connected.

6. The device for treating bifurcation vascular stenosis according to claim 5, characterized in that: The limiting structure (312) is a biodegradable polymer film.

7. The device for treating bifurcation vascular stenosis according to claim 6, characterized in that: The width of the limiting structure (312) is greater than the width of the release opening, and two sides of the limiting structure (312) are respectively fixedly arranged on two sides of the release opening.

8. The device for treating bifurcation vascular stenosis according to any one of claims 1 to 7, characterized in that: One end of the two branch parts (120) is respectively hinged to the main body part (110) to adjust the angle between the two branch parts (120).

9. The device for treating bifurcation vascular stenosis according to claim 8, characterized in that: The distal end surfaces (121) of the two branch parts (120) of the Y-shaped stent (100) are arranged perpendicular to the axial direction, and the proximal end surfaces (122) form a set angle with the axial direction.

10. The device for treating bifurcation vessel stenosis according to claim 9, characterized in that: The angle formed by the proximal end surfaces (122) of the two branch parts (120) and the generatrix of the hinge position is an acute angle.

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