Intravascular stent conveying system and conveying method thereof

Abstract

The invention relates to the technical field of medical instruments, in particular to an intravascular stent conveying system and a conveying method.The intravascular stent conveying system comprises an intravascular stent and a conveying device, and the intravascular stent comprises a telescopic tube, a main tube connected with the front end of the telescopic tube and a plurality of branch tubes connected to one side of the telescopic tube; the conveying device comprises a handle assembly, a main body bending adjusting assembly, a main body releasing assembly, a branch bending adjusting assembly, a branch releasing assembly and an outer sheath assembly. The handle assembly comprises a holding handle, a supporting rod and a guide head which are connected in sequence, and the holding handle is hollow; the outer sheath assembly is arranged on the periphery of the supporting rod in a sleeving mode and located between the holding handle and the guide head. The requirement for bending adjustment during intravascular stent implantation is met, independent release of all structures of the intravascular stent is achieved, the release mode is simple and convenient, the learning curve is short, profound hypothermia circulation arrest is avoided in the whole operation process, the operation difficulty is reduced, and damage to a patient is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a vascular stent delivery system and a delivery method thereof. Background Art

[0002] Stanford type A aortic dissection is a life-threatening cardiovascular emergency involving the ascending aorta, with an abrupt and devastating onset. A tear in the aortic intima causes blood to rush into the vessel wall, forming a dissection. If not treated promptly, the mortality rate can reach 50% within 48 hours, and the mortality rate increases by 1% every hour. The disease often presents as sudden, severe chest and back pain, which may be accompanied by organ ischemia or shock. Approximately 70% of aortic diseases are dissections, with type A being the majority, and a mortality rate of 62%-91% within a week. Traditional surgeries are difficult and prone to complications, resulting in an extremely poor prognosis for patients. Founded by Professor Sun Lizhong in 2003, the Sun's Procedure revolutionized the treatment of aortic dissection and invented a specialized elephant trunk stent. Its core advantage lies in its combination of total aortic arch replacement and stent-mounted elephant trunk technology. By implanting an elephant trunk stent, the true lumen is effectively expanded, the false lumen is closed, and postoperative complications are significantly reduced.

[0003] However, the existing elephant trunk stent used in the Sun procedure, as well as its various modified versions, still face challenges. First, the procedure must be performed under deep hypothermic circulatory arrest, which requires extremely high technical skills and can lead to perioperative complications such as brain damage (5.1%) and renal failure (12.8%). Second, the procedure relies on specialized teams, making it difficult for primary care hospitals to perform, resulting in some patients losing the opportunity for treatment due to delayed referral. To address the requirement for deep hypothermic circulatory arrest during the elephant trunk stent procedure, numerous domestic researchers have proposed various solutions. Professor Shu Chang of Fuwai Hospital proposed the "chimney stent" approach, while Professor Guo Wei of the 301 National Hospital proposed the "modular stent" approach. Both approaches can be used to treat Stanford type A aortic dissection. While both avoid deep hypothermic circulatory arrest and utilize minimally invasive interventions, they can achieve the desired treatment. However, both utilize a "main stent + branch stent" design, which can easily lead to migration and endoleaks during the combined use of the two stents, leading to postoperative complications. These solutions cannot replace surgical treatment for complex Stanford type A aortic dissections.

[0004] The improved elephant trunk stent is represented by a multi-branch stent, as shown below Figure 1As shown, it includes a main stent 1, a branch stent 2 and a sutured blood vessel 3. The stent described in this scheme has the following problems during use and after implantation: the top A of the branch stent 2 is prone to poor adhesion to the wall and causes internal leakage, which in turn leads to postoperative complications; the root B of the branch stent 2 is relatively fixed, so it is difficult to adapt to the patient's branch blood vessel during implantation, causing the branch stent 2 to easily shift and fall out of the branch blood vessel; the operation is performed under deep hypothermia circulatory arrest conditions, but the stent itself has no blood vessels for perfusion, which limits the extracorporeal circulation method during the operation and easily causes operational inconvenience; the distal end C of the main stent is seamless, which is not conducive to secondary surgery; the entire operation still needs to be completed under deep hypothermia circulatory arrest conditions, which still causes great damage to the patient's body and many postoperative complications.

[0005] In minimally invasive interventional treatment options, such as Figure 2 The "chimney stent" technology shown in the figure uses a main stent A and a chimney stent B parallel to the main stent for treatment. However, due to the split structure between the two stents, this scheme is prone to stent displacement and internal leakage at the joint of the two stents. Summary of the Invention

[0006] In response to the problems in the prior art, the present invention provides a vascular stent delivery system and a delivery method thereof. The system has an ingenious design, which not only solves the problems of internal leakage and displacement of the vascular stent, but also achieves the adaptability of the branch spacing and the patient's blood vessel spacing, while taking into account the needs of secondary surgery and extracorporeal circulation perfusion, and completely avoids the deep hypothermic circulatory arrest process. The design of the delivery system not only meets the need for bending adjustment during vascular stent implantation, but also realizes the independent release of various structures of the vascular stent. The release method is simple, the learning curve is short, and the entire operation process avoids deep hypothermic circulatory arrest, reducing the difficulty of the operation and reducing damage to the patient.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides a vascular stent delivery system, which includes a vascular stent and a delivery device. The vascular stent includes a telescopic tube, a main tube connected to the front end of the telescopic tube, and a plurality of branch tubes connected to one side of the telescopic tube. The delivery device includes a handle assembly, a main body bending assembly, a main body releasing assembly, a branch bending assembly, a branch releasing assembly and an outer sheath assembly; The handle assembly includes a gripping handle, a support rod, and a guide head connected in sequence, wherein the gripping handle is hollow; the outer sheath assembly is sleeved on the outer periphery of the support rod, the outer sheath assembly is located between the gripping handle and the guide head, and the gripping handle is hollow; The main body bending assembly is used to bend the support rod; The main body releasing component is used to compress the vascular stent onto the support rod or release the vascular stent, and the main body releasing component pulls the vascular stent into the outer sheath component when compressing the vascular stent; The branch bending assembly is used to bend the branch tubes of the vascular stent; The branch release component is used to be bound to the branch tube of the vascular stent and to compress or release the branch tube.

[0008] Among them, the main body bending adjustment assembly includes a main body bending adjustment steel cable and a main body bending knob, one end of the main body bending adjustment steel cable is connected to the main body bending knob, and the other end of the main body bending steel cable passes through the inner cavity of the support rod and is connected to the head end of the support rod, and the main body bending knob is movably mounted on the outer periphery of the holding handle.

[0009] Among them, the main body release component includes a main body release guide wire and a main body release handle, one end of the main body release guide wire is connected to the main body release handle, and the other end of the main body release guide wire passes through the holding handle and extends to the support rod. The other end of the main body release guide wire is bound to the vascular stent from the outside of the vascular stent and compresses the vascular stent onto the support rod, and the main body release handle is movably sleeved on the outer periphery of the holding handle.

[0010] Among them, the branch bending adjustment assembly includes a branch bending adjustment steel cable and a branch bending adjustment knob. One end of the branch bending adjustment steel cable is connected to the branch bending adjustment knob. The other end of the branch bending adjustment steel cable passes through the holding handle, the telescopic tube and the branch tube in sequence and is located in the branch tube. The branch bending adjustment knob is movably mounted on the outer periphery of the holding handle.

[0011] In which, the branch release assembly includes a branch release guide wire and a branch release handle, one end of the branch release guide wire is connected to the branch release handle, and the other end of the branch release guide wire passes through the holding handle, the telescopic tube and the branch tube in sequence and is bound to the outside of the branch tube, and the branch release handle is movably mounted on the outer periphery of the holding handle.

[0012] Among them, the outer sheath assembly includes an outer sheath tube and an outer sheath handle, the outer sheath handle is arranged at one end of the outer wall of the outer sheath tube, the outer sheath tube is sleeved on the outer circumference of the support rod, one end of the outer sheath tube is connected to the holding handle, and the other end of the outer sheath tube is connected to the guide head.

[0013] Wherein, the outer sheath is a thin-walled tubular structure.

[0014] In which, the telescopic tube includes a main telescopic tube body and a branch telescopic tube body, the branch telescopic tube body is connected to one side of the main telescopic tube body and communicates with the main telescopic tube body, the main tube includes a main membrane and multiple main metal rings, the branch tube includes a branch membrane and multiple branch metal rings, one end of the main telescopic tube body is connected to the main membrane, and the multiple main metal rings are arranged in a row at equal intervals along the length direction of the vascular stent on the outer circumferential wall / inner circumferential wall of the main membrane and the outer circumferential wall / inner circumferential wall of the main telescopic tube body, the branch membrane is connected to the other side of the main telescopic tube body, and the branch metal rings are arranged around the outer circumferential wall / inner circumferential wall of the branch membrane.

[0015] Preferably, the main membrane and the branch membranes are both arranged in a tubular shape.

[0016] The present invention also provides a vascular stent delivery method based on the vascular stent delivery system, which comprises the following steps: S1. After establishing extracorporeal circulation, a small incision is made in the patient's ascending aorta or aortic arch, and a purse-string is created, followed by the insertion of a sealing guide sheath. S2. Under ultrasound guidance / DSA guidance, guide the branch release guidewires in the branch vessels into the branch vessels respectively; S3. Slowly push the delivery system with the vascular stent through the guide sheath and implant it into the intended lesion location; S4, removing the sheath component and releasing the stent in the contracted state; S5. Slowly guide the main tube and the main telescopic tube into the corresponding blood vessels using the main bending assembly, and slowly guide the branch tube into the corresponding blood vessels using the branch bending assembly; S6. Release the main tube and the main telescopic tube through the main body release assembly, and release each branch tube in turn through the branch release assembly; S7. Withdraw the delivery system and simultaneously transfer the extracorporeal arterial perfusion tube to the branch telescopic tube on the vascular stent; S8. Use a vascular clamp to block the main telescopic tube proximal to the branch telescopic tube, transect the ascending aorta, and then anastomose the ascending aorta to the free end of the main telescopic tube on the vascular stent. S9. After the operation is completed, stop extracorporeal circulation and restore the patient's autologous circulation.

[0017] Beneficial effects of the present invention: The present invention is cleverly designed, which not only solves the problems of internal leakage and displacement of the vascular stent, but also achieves the adaptability of the branch spacing and the patient's blood vessel spacing, while taking into account the needs of secondary surgery and extracorporeal circulation perfusion, and completely avoids the deep hypothermic circulatory arrest process; the design of the delivery system not only meets the needs of bending adjustment during vascular stent implantation, but also realizes the independent release of each structure of the vascular stent, and the release method is simple, the learning curve is short, the entire operation process avoids deep hypothermic circulatory arrest, reduces the difficulty of the operation, and reduces damage to the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the improved elephant trunk stent with a multi-branch stent in the prior art.

[0019] Figure 2 It is a structural schematic diagram of a chimney support in the prior art.

[0020] Figure 3 It is a structural schematic diagram of a vascular stent delivery system of the present invention.

[0021] Figure 4 It is a schematic structural diagram of the conveying device of the present invention.

[0022] Figure 5 This is a schematic diagram of the structure of the delivery device of the present invention after the outer sheath component is hidden.

[0023] Figure 6 It is a structural schematic diagram of the main body bending adjustment component and the main body releasing component of the present invention respectively cooperating with the vascular stent.

[0024] Figure 7 It is a structural schematic diagram of the branch release component and the branch bending adjustment component of the present invention respectively cooperating with the vascular stent.

[0025] Figure 8 Schematic diagram of the structure of the outer sheath assembly of the present invention.

[0026] Figure 9 This is a schematic diagram of the state of the vascular stent of the present invention being delivered by a delivery device.

[0027] exist Figures 1 to 9 Reference numerals in the figures include: 1. Main stent; 2. Branch stent; 3. Suturing blood vessels; 10. Telescopic tube; 11. Main tube; 12. Branch tube; 100, main telescopic tube body; 101, branch telescopic tube body; 110, main body membrane; 111, main body metal ring; 120, branch membrane; 121, branch metal ring; 122, spring support tube; 21. Branch release assembly; 22. Branch bending assembly; 24. Handle assembly; 25. Main body bending assembly; 26. Outer sheath assembly; 27. Seeker; 28. Main body release assembly; 211. Branch release guidewire; 212. Branch release handle; 221. Branch bending cable; 222. Branch bending handle; 240. Grip handle; 241. Support rod; 251. Main body bending cable; 252. Main body bending handle; 261, outer sheath; 262, outer sheath handle; 281. Main body release guide wire; 282. Main body release handle. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments 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 without making creative work are within the scope of protection of the present invention. It will be understood that the drawings are only provided for reference and illustration purposes and are not intended to limit the present invention. The connection relationship shown in the drawings is only for the convenience of clear description and does not limit the connection method.

[0029] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component, or there may be an intermediate component at the same time. Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as those generally understood by technicians in the technical field of the present invention. It should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, an electrical connection, or a communication between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0030] It should also be noted that in the description of the present invention, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Example 1

[0031] like Figures 3 to 9 As shown, a vascular stent delivery system includes a vascular stent and a delivery device. The vascular stent includes a telescopic tube 10, a main tube 11 connected to the front end of the telescopic tube 10, and a plurality of branch tubes 12 connected to one side of the telescopic tube 10. The telescopic tube 10 is a corrugated tubular structure with an axially retractable function. The distal end of the main tube 11 is provided with a suturing edge to facilitate suturing during secondary surgery. The telescopic tube 10 includes a main telescopic tube body 100 and a branch telescopic tube body 101. The branch telescopic tube body 101 is connected to one side of the main telescopic tube body 100 and communicates with the main telescopic tube body 100. The main tube 11 includes a main body membrane 110 and a plurality of main body metal rings 111. The branch tube 12 includes a branch membrane 120 and a plurality of branch metal rings 121. One end of the main telescopic tube body 100 is connected to the main body membrane 110. The plurality of main body metal rings 111 are arranged in a row at equal intervals along the length direction of the stent around the outer circumferential wall / inner circumferential wall of the main body membrane 110 and the outer circumferential wall / inner circumferential wall of the main telescopic tube body 100. The branch membrane 120 is connected to the other side of the main telescopic tube 100, and the branch metal ring 121 is wound around the outer circumferential wall / inner circumferential wall of the branch membrane 120; preferably, the main membrane 110 and the branch membrane 120 are both tubular; one end of the main telescopic tube 100 is fixedly connected to one end of the main membrane 110, and the other end of the main membrane 110 is a free end that can be anastomosed with the patient's ascending aorta; one end of the branch telescopic tube 101 is fixedly connected to the side wall of the main telescopic tube 100, and the two are completely connected. During surgery, the branch telescopic tube 101 can be used as a perfusion blood vessel to facilitate extracorporeal circulation. The main tube 11 is used to reconstruct the patient's descending aorta during surgery; the main membrane 110 of the main tube 11 is a tubular structure, one end of which is fixedly connected to the main telescopic tube body 100 and the other end is a free end; the main metal ring 111 is a closed annular structure made of metal material and has a certain radial support force. Each main metal ring 111 is an independent annular structure and is not connected to each other. The main metal ring 111 is fixed to the inner or outer side of the main membrane 110, or the double-layer main membrane 110 sandwiches the main metal ring 111 in the middle to form a "sandwich" structure; the main metal rings 111 are evenly distributed along the axial direction of the main membrane 110; at the free end of the main membrane 110, the length of the main membrane 110 exceeds the last main metal ring 111 by a certain length L, which serves as a suture edge to facilitate the operation of the second surgery; in particular, a main metal ring 111 is also provided on the end of the main telescopic tube body 100 close to the main membrane 110, and the main metal rings 111 in this part are also not connected to each other; The branch tube 12 is used to reconstruct branch blood vessels on the aortic arch; the structure of the branch tube 12 is similar to that of the main tube 11, including a branch membrane 120 and a branch metal ring 121. The branch membrane 120 is fixedly connected to the main telescopic tube body 100, and the branch metal ring 121 is arranged on the inner side or outer side of the branch membrane 120, or the double-layer branch membrane 120 sandwiches the branch metal ring 121 in the middle, forming a "sandwich" structure, and the positions of the two are relatively fixed; the branch tube 12 is perpendicular to the main telescopic tube body 100 and is arranged on the main telescopic tube body 100, and the two are completely connected. Blood passing through the main telescopic tube body 100 can be directly supplied to other parts through the branch tube 12; the number of branch tubes 12 can be 1, 2 or 3, and a main metal ring 111 is provided on the main telescopic tube body 100 below each branch tube 12. The number of main metal rings 111 is the same as the number of branch tubes 12 and is located directly below the branch tube 12. This arrangement serves two purposes: first, the main metal ring 111 supports the branch tube 12, ensuring that it is completely within the branch vessel and prevents displacement. Second, the axial flexibility of the main telescopic tube 100 allows the branch tube 12 to move, thereby adjusting the spacing between adjacent branch tubes 12 and ensuring a better fit within the branch vessel. Specifically, a loop of velvet PET cloth is positioned at the top of the branch tube 12, with the branch metal ring 121 also positioned within the cloth. This PET cloth serves as an anti-endoleak mechanism. Once implanted, the cloth perfectly conforms to the branch vessel, preventing blood from leaking into the vessel.

[0032] In the embodiment of the present application, the delivery device includes a handle assembly 24, a main body bending assembly 25, a main body releasing assembly 28, a branch bending assembly 22, a branch releasing assembly 21 and an outer sheath assembly 26; The handle assembly 24 includes a gripping handle 240, a support rod 241 and a guide head 27 connected in sequence, and the gripping handle 240 is hollow; the outer sheath assembly 26 is sleeved on the outer periphery of the support rod 241, and the outer sheath assembly 26 is located between the gripping handle 240 and the guide head 27, and the gripping handle 240 is hollow; wherein, the outer sheath assembly 26 includes an outer sheath tube 261 and an outer sheath handle 262, the outer sheath handle 262 is arranged at one end of the outer wall of the outer sheath tube 261, the outer sheath tube 261 is sleeved on the outer periphery of the support rod 241, one end of the outer sheath tube 261 is connected to the gripping handle 240, and the other end of the outer sheath tube 261 is connected to the guide head 27; wherein, the outer sheath tube 261 is a thin-walled tubular structure; The main body bending assembly 25 is used to bend the support rod 241; wherein, the main body bending assembly 25 includes a main body bending cable 251 and a main body bending knob, one end of the main body bending cable 251 is connected to the main body bending knob, and the other end of the main body bending cable 251 passes through the inner cavity of the support rod 241 and is connected to the head end of the support rod 241, and the main body bending knob is movably sleeved on the outer periphery of the gripping handle 240; The main body release assembly 28 is used to compress the vascular stent onto the support rod 241 or release the vascular stent. When the main body release assembly 28 compresses the vascular stent, it pulls the vascular stent into the outer sheath assembly 26. The main body release assembly 28 includes a main body release guide wire 281 and a main body release handle 282. One end of the main body release guide wire 281 is connected to the main body release handle 282. The other end of the main body release guide wire 281 passes through the holding handle 240 and extends to the support rod 241. The other end of the main body release guide wire 281 is bound to the vascular stent from the outside of the vascular stent and compresses the vascular stent onto the support rod 241. The main body release handle 282 is movably sleeved on the outer periphery of the holding handle 240. The branch bending assembly 22 is used to bend the branch tube 12 of the vascular stent; the branch bending assembly 22 includes a branch bending cable 221 and a branch bending knob. One end of the branch bending cable 221 is connected to the branch bending knob. The other end of the branch bending cable 221 passes through the gripping handle 240, the telescopic tube 10, and the branch tube 12 in sequence and is located inside the branch tube 12. The branch bending knob is movably sleeved on the outer periphery of the gripping handle 240. The branch release component 21 is used to bind with the branch tube 12 of the vascular stent and to compress or release the branch tube 12; the branch release component 21 includes a branch release guide wire 211 and a branch release handle 212, one end of the branch release guide wire 211 is connected to the branch release handle 212, and the other end of the branch release guide wire 211 passes through the holding handle 240, the telescopic tube 10 and the branch tube 12 in sequence and is bound to the outside of the branch tube 12, and the branch release handle 212 is movably sleeved on the outer periphery of the holding handle 240.

[0033] Specifically, the interior of the gripping handle 240 is hollow to allow various wires and guidewires to pass through; the head end of the support rod 241 is provided with threads, and the guide head 27 is connected to the head end of the support rod 241 through the threads; the support rod 241 is usually made of a polymer material, such as PE or PP, which has a certain hardness but also has a bendable function; The branch tube 12 also includes a spring support tube 122, which is a metal braid with a certain hardness and an inner cavity of a certain size, which can bend when subjected to force. One end of the spring support tube 122 is fixedly connected to the branch bending knob, and the other end extends to the support rod 241 and extends out from the branch tube 12 of the vascular stent, which can provide a certain support for the branch tube 12; one end of the branch bending cable 221 is also connected to the branch bending knob, and the other end is fixed to the head end of the spring support tube 122 through the inner cavity of the spring support tube 122. By rotating the branch bending knob, the spring support tube 122 set in the branch tube 12 of the vascular stent can be bent.

[0034] In the embodiment of the present application, three branch bending adjustment components 22 and three branch releasing components 21 are respectively provided, and they are all independent structures. The actual number of them used corresponds to the number of branch tubes 12 of the vascular stent. After the main body tube 11, the main body telescopic tube 10 and the branch tube 12 of the stent are compressed using the main body release guide wire 281 and the branch release guide wire 211, the stent is retracted as a whole into the lumen of the outer sheath tube 261; the outer sheath tube 261 is a thin-walled lumen structure, usually made of polymer materials, and its main feature is that the entire sheath tube can be torn apart by gently pulling the pull ring at one end of the sheath tube, and a closed ring structure becomes an open ring structure; the state of the stent inside the delivery system is as follows Figure 9 As shown; the outer sheath component 26 is preferably a tearable sheath that can compress the vascular stent as a whole on the support rod 241.

[0035] When the embodiment of the present application is used, a small incision is made in the patient's ascending aorta or aortic arch and a purse is made, and a guide sheath with a sealing function is inserted; the guide wire built into the branch tube 12 is guided into the branch blood vessel under ultrasound guidance / DSA guidance; the delivery system with the vascular stent is slowly pushed through the guide sheath and implanted into the expected lesion position; the external sheath 261 is removed, and the vascular stent in the contracted state is released as a whole; the main tube 11 including the main telescopic tube 10 and the branch tube 12 are slowly guided into the corresponding Intravascular; release the main tube 11 and the main telescopic tube 10 through the main release component 28, and release each branch tube 12 in turn through the branch release component 21; withdraw the conveyor, and at the same time transfer the extracorporeal circulation arterial perfusion tube to the branch telescopic tube 10 on the vascular stent; use a vascular blocking clamp to block the main telescopic tube 10 proximal to the branch telescopic tube 10, and after transecting the ascending aorta, anastomose the ascending aorta with the free end of the main telescopic tube 10 on the vascular stent; after the operation is completed, stop the extracorporeal circulation, restore the patient's autologous circulation, and achieve the therapeutic effect. The embodiment of the present application is cleverly designed, which not only solves the problems of internal leakage and displacement of the vascular stent, but also achieves the adaptability of the branch spacing to the patient's blood vessel spacing, while taking into account the needs of secondary surgery and extracorporeal circulation perfusion, completely avoiding the deep hypothermic circulatory arrest process; the design of the conveying system not only meets the needs of bending adjustment during vascular stent implantation, but also achieves the independent release of each structure of the vascular stent, and the release method is simple, the learning curve is short, and the entire operation process avoids deep hypothermic circulatory arrest, reduces the difficulty of the operation, and reduces the damage to the patient. Example 2

[0036] A second embodiment of the present application provides a vascular stent delivery method based on the vascular stent delivery system, which includes the following steps: S1. After establishing extracorporeal circulation, a small incision is made in the patient's ascending aorta or aortic arch, and a purse-string is created, followed by the insertion of a sealing guide sheath. S2. Under ultrasound guidance / DSA guidance, guide the branch release guidewire 211 in the branch tube 12 into the branch blood vessels respectively; S3. Slowly push the delivery system with the vascular stent through the guide sheath and implant it into the intended lesion location; S4, removing the outer sheath assembly 26, and releasing the entire vascular stent in the contracted state; S5. Slowly guide the main tube 11 and the main telescopic tube 100 into the corresponding blood vessels using the main bending assembly 25, and slowly guide the branch tube 12 into the corresponding blood vessels using the branch bending assembly 22; S6. Release the main tube 11 and the main telescopic tube 10 through the main body release assembly 28, and release each branch tube 12 in turn through the branch release assembly 21; S7, withdrawing the delivery system and simultaneously transferring the extracorporeal arterial perfusion tube to the branch telescopic tube 101 on the vascular stent; S8. Use a vascular blocking forceps to block the main telescopic tube 100 at the proximal end of the branch telescopic tube 101, transect the ascending aorta, and then anastomose the ascending aorta with the free end of the main telescopic tube 100 on the vascular stent. S9. After the operation is completed, stop extracorporeal circulation and restore the patient's autologous circulation.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention is disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technology of the present invention are all within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.

Claims

1. A vascular stent delivery system, characterized in that: The invention comprises a vascular stent and a delivery device, wherein the vascular stent comprises a telescopic tube, a main tube connected to the front end of the telescopic tube, and a plurality of branch tubes connected to one side of the telescopic tube; The delivery device includes a handle assembly, a main body bending assembly, a main body releasing assembly, a branch bending assembly, a branch releasing assembly and an outer sheath assembly; The handle assembly includes a gripping handle, a support rod, and a guide head connected in sequence, wherein the gripping handle is hollow; the outer sheath assembly is sleeved on the outer periphery of the support rod, the outer sheath assembly is located between the gripping handle and the guide head, and the gripping handle is hollow; The main body bending assembly is used to bend the support rod; The main body releasing component is used to compress the vascular stent onto the support rod or release the vascular stent, and the main body releasing component pulls the vascular stent into the outer sheath component when compressing the vascular stent; The branch bending assembly is used to bend the branch tubes of the vascular stent; The branch release component is used to be bound to the branch tube of the vascular stent and to compress or release the branch tube.

2. A vascular stent delivery system according to claim 1, characterized in that: The main body bending adjustment assembly includes a main body bending adjustment cable and a main body bending adjustment knob. One end of the main body bending adjustment cable is connected to the main body bending knob, and the other end of the main body bending cable passes through the inner cavity of the support rod and is connected to the head end of the support rod. The main body bending adjustment knob is movably mounted on the outer periphery of the holding handle.

3. The vascular stent delivery system according to claim 1, characterized in that: The main body release assembly includes a main body release guide wire and a main body release handle, one end of the main body release guide wire is connected to the main body release handle, and the other end of the main body release guide wire passes through the holding handle and extends to the support rod. The other end of the main body release guide wire is bound to the vascular stent from the outside of the vascular stent and compresses the vascular stent onto the support rod, and the main body release handle is movably sleeved on the outer periphery of the holding handle.

4. The vascular stent delivery system according to claim 1, characterized in that: The branch bending adjustment assembly includes a branch bending adjustment steel cable and a branch bending adjustment knob. One end of the branch bending adjustment steel cable is connected to the branch bending adjustment knob. The other end of the branch bending adjustment steel cable passes through the gripping handle, the telescopic tube and the branch tube in sequence and is located in the branch tube. The branch bending adjustment knob is movably mounted on the outer periphery of the gripping handle.

5. The vascular stent delivery system according to claim 1, characterized in that: The branch release assembly includes a branch release guide wire and a branch release handle. One end of the branch release guide wire is connected to the branch release handle. The other end of the branch release guide wire passes through the holding handle, the telescopic tube and the branch tube in sequence and is bound to the outside of the branch tube. The branch release handle is movably mounted on the outer periphery of the holding handle.

6. The vascular stent delivery system according to claim 1, characterized in that: The outer sheath assembly includes an outer sheath tube and an outer sheath handle. The outer sheath handle is arranged at one end of the outer wall of the outer sheath tube. The outer sheath tube is sleeved on the outer circumference of the support rod. One end of the outer sheath tube is connected to the holding handle, and the other end of the outer sheath tube is connected to the guide head.

7. The vascular stent delivery system according to claim 6, characterized in that: The outer sheath is a thin-walled tubular structure.

8. The vascular stent delivery system according to claim 1, characterized in that: The telescopic tube includes a main telescopic tube body and a branch telescopic tube body, the branch telescopic tube body is connected to one side of the main telescopic tube body and communicates with the main telescopic tube body, the main tube includes a main membrane and a plurality of main metal rings, the branch tube includes a branch membrane and a plurality of branch metal rings, one end of the main telescopic tube body is connected to the main membrane, and the plurality of main metal rings are arranged in a row at equal intervals along the length direction of the vascular stent around the outer circumferential wall / inner circumferential wall of the main membrane and the outer circumferential wall / inner circumferential wall of the main telescopic tube body, the branch membrane is connected to the other side of the main telescopic tube body, and the branch metal rings are arranged around the outer circumferential wall / inner circumferential wall of the branch membrane.

9. The vascular stent delivery system according to claim 8, characterized in that: The main membrane and the branch membrane are both arranged in a tubular shape.

10. A method for delivering a vascular stent based on the vascular stent delivery system according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. After establishing extracorporeal circulation, a small incision is made in the patient's ascending aorta or aortic arch, and a purse-string is created, followed by the insertion of a sealing guide sheath. S2. Under ultrasound guidance / DSA guidance, guide the branch release guidewires in the branch vessels into the branch vessels respectively; S3. Slowly push the delivery system with the vascular stent through the guide sheath and implant it into the intended lesion location; S4, removing the sheath component and releasing the stent in the contracted state; S5. Slowly guide the main tube and the main telescopic tube into the corresponding blood vessels using the main bending assembly, and slowly guide the branch tube into the corresponding blood vessels using the branch bending assembly; S6. Release the main tube and the main telescopic tube through the main body release assembly, and release each branch tube in turn through the branch release assembly; S7. Withdraw the delivery system and simultaneously transfer the extracorporeal arterial perfusion tube to the branch telescopic tube on the vascular stent; S8. Use a vascular clamp to block the main telescopic tube proximal to the branch telescopic tube, transect the ascending aorta, and then anastomose the ascending aorta to the free end of the main telescopic tube on the vascular stent. S9. After the operation is completed, stop extracorporeal circulation and restore the patient's autologous circulation.

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