Multi-stent delivery system and method

Abstract

The present invention discloses a multi-stent delivery system and a delivery method, wherein each delivery system is loaded with 2-8 point-type stents, and the delivery system includes a handle, a tip, an inner tube, an outer sheath and a tailstock, wherein the handle includes a handle body and a release knob, and a safety protection device is provided at the proximal end of the delivery system. After each stent is released, the release knob is blocked by a safety protection device closest to the knob when it continues to rotate; when releasing the next stent, the limiter needs to be removed first, and then the release knob continues to be rotated, thereby ensuring that each stent is released to the desired lesion position for the operation. In addition, a series of short stents for use with the multi-stent delivery system are also provided. A delivery system delivers multiple point-type stents, which can reduce operation time and improve the efficiency of disposable consumables; the use of multiple spaced short point-type stents achieves a smaller material coverage rate and protects the normal physiological structure of some normal blood vessel segments.

Description

Technical Field

[0001] The present application belongs to the field of medical device technology, and more specifically, relates to a multi-point stent delivery system and method for peripheral arteries, as well as a point stent used in conjunction with the delivery system. Background Art

[0002] Percutaneous transluminal balloon angioplasty (PTBA) is the primary treatment for vascular stenosis or occlusion. However, during the vessel preparation process, intimal damage and detachment, known as dissection, can occur. Furthermore, elastic recoil can occur, leading to restenosis. Inserting a stent into the diseased vessel can address these issues.

[0003] The commonly used vascular stent systems on the market today are designed to completely cover the lesion by releasing a long stent from the diseased vessel. However, existing traditional stents have the following disadvantages: (1) When treating SFA / PA (superficial femoral artery and popliteal artery) lesions, due to the special anatomical location of these vessels, the implanted stent will be subjected to various complex mechanical forces such as compression, stretching, and bending, which may result in a high risk of stent fracture. (2) Patients may have multiple discontinuous lesions within a single vessel. Existing uninterrupted long stents also cover areas without lesions, which may damage the normal physiological structure of the normal vessel segment. (3) For the treatment of BTK (below-knee artery) lesions, the patency rate of traditional long stents is extremely low, resulting in a lack of effective treatment methods for BTK lesions.

[0004] Patent document CN114469471A discloses a stent system comprising multiple short stents. Two adjacent sets of corrugated support rings are directly connected along the axial direction of the stent body, without the transition of a connecting rod. Consequently, this system still suffers from poor compliance when navigating complex, tortuous blood vessels. Furthermore, the stents are of a single length, making them inadequate for adapting to varying vessel lengths and lesion locations.

[0005] Furthermore, no prior art discloses how to use a single delivery system to deliver multiple short stents to the target lesion. Existing single delivery systems require a long surgical procedure to release a single stent, exposing the operator and patient to harmful radiation from the imaging device. Furthermore, a single delivery system, which only delivers a single short stent, results in low efficiency. Using disposable consumables also generates significant amounts of medical waste, which is detrimental to environmental protection. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides a multi-stent delivery system and a delivery method thereof, and provides a matching point stent.

[0007] Specifically, the present invention provides a multi-stent delivery system, each delivery system is loaded with 2 to 8 point-type stents, the delivery system includes a handle, a tip, an inner tube, an outer sheath and a tailstock, wherein the handle includes a handle body and a release knob, and a safety protection device is provided at the proximal end of the delivery system, wherein the safety protection device is a limiter, and after each stent is released, when the release knob continues to rotate, it is blocked by a limiter closest to the knob; when releasing the next stent, it is necessary to remove the limiter first, and then continue to rotate the release knob, thereby ensuring that each stent is released to the desired lesion position for surgery.

[0008] Specifically, the outer diameter of the delivery system is 4 to 6F, which is convenient for repeated angiography and precise positioning through the 6F vascular sheath commonly used in peripheral interventional surgery; the effective length of the delivery system is 80 to 150 cm, and it can be inserted into lesions at different distances.

[0009] In addition, the handle of the delivery system has released stent marks (24, 25, 26) and released stent number marks. Specifically, a marking line is set on the release mark, and when the knob is turned to this position, it means that the stent has been released; digital marks 1, 2, 3, etc. are also set to represent the number of released stents; a tailstock is set at the proximal end of the delivery system, especially a Luer tailstock (19) to facilitate the insertion of the guide wire.

[0010] The multi-stent delivery system uses a rotary stepless release system, which makes operation smoother and positioning and release more precise.

[0011] The present invention also provides a point-type stent for use in conjunction with the multi-stent delivery system described in claim 1, wherein each stent is 6-30 mm long, and includes an annular wave rod unit composed of wave rods, a connecting rod connecting the wave rod units, and a developing point arranged on some of the connecting rods, wherein the connecting rods between the wave rod units include a short connecting rod connecting the closest position between the two wave rod units and / or a long connecting rod connecting the farthest position between the two wave rod units. When both the short connecting rod and the long connecting rod are provided, the short connecting rod and the long connecting rod are arranged alternately in the wave rod unit, and both connecting rods include a portion that is not parallel to the central axis of the stent.

[0012] Specifically, the short connecting rod connects the closest points of the wave rod units that are staggered a certain distance circumferentially with the shortest straight line, and this line forms an acute angle with the central axis of the bracket; the long connecting rod is in a "Z" shape, one side of the connecting rod is on a certain axis, and two bending points are formed in the middle of the connecting rod. The connecting rod part between the two bending points is not parallel to the central axis of the bracket, and then the other side of the connecting rod is on another axis.

[0013] The point-type stent provided by the present invention includes at least two series. The length of the stent in one series is 15-30 mm. The two ends of the stent are slightly flared outward, forming a trumpet shape, which is used to fix the stent to the vascular endothelium and prevent the stent from shifting. The development point of the stent is set on the first long connecting rod at the left and right ends of the stent.

[0014] Another series of brackets has a length of 6-15 mm. Two to four protrusions (7) are symmetrically arranged at positions where there is no connecting rod on the outside of the first wave-rod unit at both ends of the bracket. One end of the protrusion is connected to the inside of the wave-rod corner, and the other end protrudes from the bracket surface, with the end portion being 0.5-2 mm higher than the surface. The developing point of the bracket is set on the connecting rod in the middle of the bracket.

[0015] By loading stents of different lengths into one delivery system, stents can be released at multiple lesion sites of different lengths in one delivery, saving surgical time.

[0016] The present invention also provides a delivery method of a multi-stent delivery system, comprising the following steps:

[0017] (1) Before surgery, perform angiography of the blood vessels and surrounding areas, and load different numbers and lengths of stents into the delivery system based on the number of lesions such as blockage and stenosis and the length of each lesion.

[0018] (2) inserting a delivery system loaded with a plurality of stents into the lesion site, and aligning the first stent with the lesion site to be expanded;

[0019] (3) Rotate the release knob at the proximal end of the delivery system to drive the outer sheath away from the tip, and the first stent begins to be released. When the knob is rotated to the first stent release completion mark, the first stent is completely released to the lesion site; further rotation will be blocked by the first limiter;

[0020] (4) After the delivery system is moved under the imaging device so that the second stent reaches the new lesion site, the operator removes the first stopper and again rotates the knob to the second stent release completion mark as described above, thereby completely releasing the second stent to the lesion site;

[0021] (5) Repeat the above step (4) until all the stents are released from all the lesions or all the loaded stents are released;

[0022] (6) Exit the conveying system.

[0023] In addition, the present invention also provides a stent system, comprising the above-mentioned multi-stent delivery system, the above-mentioned point-type stent, a guide wire, and a catheter.

[0024] The above technical solution provided by the present invention has at least the following beneficial effects:

[0025] (1) The present invention uses multiple spaced short point-shaped stents to accurately and purposefully fix the vascular endothelium at the diseased site, avoiding the unnecessary or even adverse endothelium fixation of non-lesioned sites by existing long stents. At the same time, it also achieves a smaller material coverage rate and protects the normal physiological structure of some normal vascular segments.

[0026] (2) The present invention uses a conveying system to convey multiple point-shaped stents at a time, thereby improving the utilization efficiency of disposable consumables and reducing the generation of medical waste from the conveying system from an environmental perspective.

[0027] (3) The present invention loads stents of different lengths into one delivery system, and can release corresponding stents at multiple lesion sites of different lengths through one delivery, thereby reducing the surgical operation time required for the existing technology of releasing a single stent with a single delivery system, and reducing the time that the surgical operator and the patient are exposed to harmful radiation generated by the imaging equipment.

[0028] (4) The point-shaped stent used in conjunction with the delivery system of the present invention has a special connection structure, which is specifically used for endothelial fixation. Its chronic tension is less than that of traditional stents, avoiding the inflammatory response, vascular smooth muscle cell proliferation and restenosis problems caused by it. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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. 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 these drawings without creative work.

[0030] Figure 1 Schematic diagram of blood vessels at multiple lesion sites;

[0031] Figure 2 This is an overall schematic diagram of the multi-stent delivery system of this application;

[0032] Figure 3 This is a schematic diagram of the distal end of the multi-stent delivery system of this application;

[0033] Figure 4 This is a schematic diagram of the proximal end of the multi-stent delivery system of this application. Figure 2 Enlarged view of the part indicated by the middle circle;

[0034] Figure 5 Schematic diagram of the treatment of lesions with multiple stents for this application;

[0035] Figure 6 This is a schematic diagram of a series of trumpet-shaped brackets with a length of 15-30mm in this application;

[0036] Figure 7 This is a schematic diagram of a series of 6-15mm long stents with convex thorns in this application;

[0037] Description of reference numerals:

[0038] 1: wave rod; 2: wave rod unit; 3: connecting rod; 4: developing point; 5: short connecting rod;

[0039] 6: long connecting rod; 7: convex thorn;

[0040] 10: Multi-stent delivery system; 11: Handle; 12: Tip; 13: Inner tube; 14: Outer sheath; 15: Handle body; 16: Release knob; 17: Stopper; 18: Inter-stent limiting ring; 19: Luer tailstock;

[0041] 20: Point bracket; 21: First bracket; 22: Second bracket; 23: Third bracket; 24: First bracket release completion mark; 25: Second bracket release completion mark; 26: Third bracket release completion mark; 27: Development mark;

[0042] 31: first lesion site; 32: second lesion site; 33: third lesion site; DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0044] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element. The embodiments and features in the embodiments of this application may be combined with each other unless there is a conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0045] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0047] In this application, the terms "proximal" and "distal" are relative to the doctor, where proximal means closer to the doctor and distal means farther away from the doctor.

[0048] (1) Multi-stent delivery system

[0049] like Figure 1 As shown, a patient may have multiple discontinuous lesion sites 31, 32, and 33 in a blood vessel. The length of each lesion site may be the same or different. The type of each lesion is one of residual stenosis 31, dissection 32, and elastic recoil 33. Figure 1 The figure shows three lesion sites, and the types of the three lesions are different. It is easy for those skilled in the art to understand that the number, length and type of the lesions are not affected by the above. Figure 1 limited.

[0050] Traditional delivery systems can only release one stent at a time. In cases with multiple lesions, the delivery system needs to be inserted multiple times, which takes a long time and exposes patients and doctors to harmful radiation for a longer time. This is a challenge for both doctors and patients, and there is also a higher probability of accidents.

[0051] In order to release multiple stents through one delivery, the present application provides a multi-stent delivery system, such as Figure 2 、 Figure 3 and Figure 4 As shown, the delivery system 10 comprises a handle 11, a tip 12, an inner tube 13, an outer sheath 14, and a Luer tailstock 19. The distal ends of the inner tube 13 and the outer sheath 14 are provided with imaging markers 27 or stent release markers for positioning under imaging equipment during delivery and release. A tailstock, particularly a Luer tailstock (19), is provided at the proximal end of the delivery system to facilitate guidewire insertion.

[0052] The handle 11 includes a handle base 15 and a release knob 16. Figure 4 The upper part of the knob is rotated outward perpendicular to the paper surface, and the lower part of the knob is rotated inward perpendicular to the paper surface, so that the knob moves to the right as a whole, thereby driving the outer sheath 14 to move away from the tip 12. At this time, the first bracket 21 begins to release. When the knob is rotated to the first bracket release completion mark 24 (in the schematic diagram), the first bracket 21 is released. Figure 4In the process, when the knob passes the first stent release completion mark 24 and continues to move to the right so that the first stent release completion mark 24 is just exposed to the left side of the knob), the first stent 21 is completely released to the lesion site. Continuing to rotate will be blocked by the first limiter 17, thus preventing the user from releasing the second stent 22 prematurely. After the delivery system is moved under the radiation so that the second stent 22 reaches the new lesion site, the operator removes the first limiter 17 and again rotates the knob as described above to the second stent release completion mark 25, and the second stent 22 is completely released to the lesion site. After the delivery system is moved under the radiation so that the third stent 23 reaches the new lesion site, the operator removes the second limiter and again rotates the knob as described above to the third stent release completion mark 26, and the third stent 23 is completely released to the lesion site.

[0053] Specifically, a marking line is set on the bracket release completion marks 24, 25, and 26. When the knob is turned to this position, it means that the bracket has been released; digital marks 1, 2, 3, etc. can also be selected or set at the same time to represent the number of brackets released.

[0054] In the above embodiment, the stopper at the proximal end of the delivery system serves as a safety feature to prevent the physician from carelessly rotating the device too far, causing the next stent to be released prematurely before it reaches its correct position. For added safety, a stopper ring 18 is positioned between multiple stents loaded at the distal end of the delivery system to prevent the physician from accidentally releasing multiple stents simultaneously.

[0055] It will be appreciated by those skilled in the art that the safety device can also take other forms, such as a spring latch. When the knob is rotated to the mark where a stent is released, the spring latch in the handle knob is inserted into the hole on the screw at the proximal end of the delivery system, and the knob is locked. The stent is fully released to the lesion site while preventing the user from prematurely releasing the next stent. In this case, the spring latch acts as a safety device. When the delivery system moves to the next lesion site, the spring latch is released from the hole on the screw, so that the release knob can be rotated again and the next stent is released; the above process is repeated in sequence.

[0056] Regarding the completion mark of the stent release, a number of stent releases may be used to mark the completion of the release of multiple stents; different colors may be used for marking, or scale lines may be used for marking.

[0057] (2) Transportation method

[0058] Reference Figure 5 Schematic diagram of the treatment of lesions with multiple stents in this application. The working steps of using the multi-stent delivery system of this application are as follows:

[0059] (1) Before surgery, angiography is performed on the blood vessels and surrounding areas, and different numbers and lengths of stents are loaded into the delivery system according to the number of lesions such as stenosis and blockage in the blood vessels and the length of each lesion. It is easy for those skilled in the art to understand that the angiography method can be CT, MRI, or digital angiography;

[0060] (2) inserting a delivery system loaded with multiple stents into the lesion site, and aligning the first stent with the lesion site to be expanded; those skilled in the art will readily understand that the lesion site to be expanded may be the site farthest from the doctor, or may be a lesion at a specific site according to the surgical plan;

[0061] (3) Rotate the release knob at the proximal end of the delivery system to drive the outer sheath to move away from the tip, and the first stent begins to be released. When the knob is rotated to the first stent release completion mark, the first stent is completely released to the lesion site; further rotation will be blocked by the first limiter or spring latch;

[0062] (4) After the delivery system is moved under the imaging device so that the second stent reaches the new lesion site, the operator removes the first stopper or spring latch and again operates the release knob as described above until the second stent release completion mark is reached, thereby completely releasing the second stent to the lesion site;

[0063] (5) Repeat the above step (4) until all the stents are released from all the lesions or all the loaded stents are released;

[0064] (6) Exit the conveying system.

[0065] (3) Point-shaped stents used in conjunction with the multi-stent delivery system of this application

[0066] The present application also provides a point-shaped stent for use with a multi-stent delivery system, specifically a peripheral artery-specific point-shaped stent, wherein each stent is 6-30mm long. This length is shorter than that of a traditional single stent, making it easier to deliver. When implanted into anatomical structures such as the superficial femoral artery and popliteal artery, the possibility of being subjected to various complex mechanical effects such as compression, stretching, and bending is greatly reduced, and it is not easy to break. Specifically, in order to adapt to different anatomical parts and / or lesions of different lengths, the present application designs stents of at least two length series, namely, Figure 6 The stent series with a length of 15-30 mm shown is particularly suitable for above-knee femoral and popliteal arteries or long lesions, as well as Figure 7 The stent series shown in the figure, with a length of 6-15 mm, is particularly suitable for infrapopliteal arteries or areas with shorter lesions. By designing stent series of different lengths, doctors and patients can choose stents based on different lesion locations or lesion lengths.

[0067] Reference Figure 6 , brackets of different length series all include a wave bar unit 2 composed of a wave bar 1, a connecting rod 3 connecting the wave bar units, and a developing point 4 set on some of the connecting rods. Except for the connecting rods with the developing points, the connecting rods between other wave bar units 2 include two types, namely a short connecting rod 5 connecting the closest position between the two wave bar units and a long connecting rod 6 connecting the farthest position between the two wave bar units. The short connecting rod 5 and the long connecting rod 6 are arranged alternately in the wave bar unit, and both connecting rods include a portion that is not parallel to the central axis of the bracket.

[0068] Further references Figure 6 Both connecting rods include sections that are nonparallel to the central axis of the stent. Specifically, the long connecting rod is Z-shaped, consisting of three sections. One end of the connecting rod is on a specific axis, with two bends formed in the middle. The section of the connecting rod between the two bends is nonparallel to the central axis of the stent, and the other end of the connecting rod is on another axis. Preferably, the sections at both ends of the connecting rod are parallel to the central axis of the stent, forming an obtuse angle with the middle section. In contrast, the short connecting rod connects the closest points of the circumferentially offset waveguide elements with the shortest straight line, which forms an acute angle with the central axis of the stent.

[0069] By setting up the connecting rod with the special connecting structure as described above, the chronic tension thereof is less than that of the traditional stent, thereby avoiding the inflammatory response, vascular smooth muscle cell proliferation and restenosis problems caused thereby, and can be better used for endothelial fixation.

[0070] Refer again Figure 6 The developing points of the stent series with a length of 15-30mm are set on the first long connecting rods at the left and right ends of the stent, so that the release length of the stent can be easily determined by the positions of the two developing points when implanted in the lumen of the blood vessel. And the two ends of the stent are slightly flared outward, in a trumpet shape, which is used to fix the stent to the vascular endothelium and prevent the stent from shifting. Since the length of this stent is slightly longer than that of the 6-15mm stent series, there is no need for a barb structure, and only the outward-flared trumpet-shaped structure can achieve the fixing effect, and the barbless structure avoids possible damage to the tissue. It is easy for those skilled in the art to understand that the stent series with a length of 15-30mm can also be straight, not trumpet-shaped.

[0071] Reference Figure 7Another series of stents provided in this application has a length of 6-15 mm, in which the stent's imaging point is located on the connecting rod in the middle of the stent. Due to its short length, the horn structure is not easy to implement. Two to four protrusions 7 are symmetrically positioned on the outside of the first wave-bar unit at both ends of the 6-15 mm stent, where there is no connecting rod. One end of the protrusion is connected to the inside of the wave-bar corner, and the other end protrudes from the stent surface, with the end 0.5-2 mm above the surface. This achieves the effect of fixing the stent to the vascular endothelium. Those skilled in the art will readily understand that the series of stents with a length of 6-15 mm can also be made without protrusions.

[0072] In addition, the development point of the peripheral artery-specific point-type stent of the present application is circular in shape with a diameter of 0.3 to 0.8 mm, and the development point material is one of metals such as tantalum, platinum, gold, tungsten, iridium, etc., or an alloy composed of the above metal elements.

[0073] The diameter of each stent of the peripheral artery-specific point-type stent intraluminal repair system of the present application is 1.5-8 mm, the stent wall thickness is 50-200 microns, preferably 80-150 microns, and the material is designed to be biodegradable metal or polymer material, nickel-titanium alloy, cobalt-chromium alloy, stainless steel. The thinner stent wall thickness is to reduce the metal coverage and rapid endothelialization, while reducing the chronic external tension of the stent, thereby reducing the intimal hyperplasia caused by stimulation of the endothelium. In particular, in the case of stent re-occlusion, the stent with a thinner wall thickness is easy to destroy, which is conducive to the use of other traditional metal stents or covered stents to reconstruct the occluded segment.

[0074] The stent of the peripheral artery-specific point-type stent intraluminal repair system of the present application can be a bare stent without any coating; it can be a stent with a functional coating such as a gold coating, a platinum coating, a tantalum coating, a carbon coating, a carbon-silicon coating, a phosphorylcholine (PC) coating or a heparin coating, and the functional coating is used to improve the visibility of the stent under X-rays, reduce thrombosis or alleviate the proliferation reaction of smooth muscle cells, etc.; it can also be a drug-eluting stent, in which drugs such as rapamycin and its derivatives, paclitaxel, etc. are released from the polymer coating in a controlled manner into the vascular wall tissue by elution, thereby preventing restenosis in the stent by inhibiting excessive proliferation of smooth muscle cells.

[0075] The present application's dedicated point-type stent endovascular repair system for peripheral arteries has 3-6 connecting rods between its strut units, a stent strut length of 1.5-3.8 mm, and each strut unit has 16 or 24 corners, corresponding to a corresponding number of rods of 16 or 24. By providing fewer connecting rods and rationally designing the length, corners, and number of rods, a balance is achieved between reducing stent coverage of the vessel, minimizing stent irritation to the vessel, and maximizing the ability to open the narrowed vessel, enabling the stent to better fix the intima of the peripheral arteries.

[0076] (4) Support system

[0077] This application also provides a complete stent system, which includes the multi-stent delivery system described in (1) above, the multiple point-shaped stents described in (3) above, as well as a guidewire and catheter for guidance; and even a balloon for expansion. These guidewires, catheters, and balloons adopt existing conventional designs and will not be described in detail here.

[0078] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several superpositions, deletions, improvements and embellishments can be made without departing from the principles described in the present invention. These superpositions, deletions, improvements and embellishments should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-stent delivery system (10), each delivery system is loaded with 2-8 point-type stents (20), wherein each point-type stent (20) is 6-30 mm long, and the delivery system comprises a handle (11), a tip (12), an inner tube (13), and an outer sheath (14), characterized in that: The handle (11) includes a handle body (15) and a release knob (16). A safety protection device is provided at the proximal end of the delivery system. After each stent is released, the release knob is blocked by the safety protection device near the knob when it is continued to rotate. When releasing the next stent, the safety protection device needs to be intentionally released first, and then the release knob is continued to be rotated, so as to ensure that each stent is released to the desired lesion position for the operation. The safety protection device is a limiter (17) or a spring latch. When the delivery system is moved so that the stent reaches the lesion site, the limiter is removed by the operator. Or when the delivery system is moved so that the stent reaches the lesion site, the spring latch is released from the hole on the screw of the delivery system. In addition, a limit ring (18) is provided between the multiple stents loaded at the distal end of the delivery system, and the handle of the delivery system has a released stent mark (24, 25, 26). The point-type stent used in conjunction with the multi-stent delivery system, wherein each stent is 6-30 mm long, comprises an annular wave rod unit (2) composed of a wave rod (1), a connecting rod (3) connecting the wave rod units, and a developing point (4) set on a part of the connecting rod. The connecting rods between the wave rod units (2) comprise a short connecting rod (5) connecting the closest position between the two wave rod units and a long connecting rod (6) connecting the farthest position between the two wave rod units. Both the short connecting rod and the long connecting rod are provided, and the short connecting rod and the long connecting rod are alternately arranged in the wave rod unit, and the two connecting rods Both include a portion that is not parallel to the central axis of the bracket; wherein the short connecting rod (5) connects the closest points between the wave rod units that are staggered at a certain distance in the circumferential direction with the shortest straight line, and this line forms an acute angle with the central axis of the bracket; the long connecting rod (6) is in a "Z" shape, one side of the connecting rod is on a certain axis, and two bending points are formed in the middle of the connecting rod. The connecting rod portion between the two bending points is not parallel to the central axis of the bracket, and then the other side of the connecting rod is on another axis. The sections at both ends of the long connecting rod are parallel to the central axis of the bracket, and the sections at both ends form an obtuse angle with the middle section.

2. The multi-stent delivery system (10) according to claim 1, wherein a Luer tail seat (19) is provided at the most proximal end of the delivery system.

3. The multi-stent delivery system (10) according to claim 1, wherein precise positioning and release are achieved through a rotary stepless release system.

4. The multi-stent delivery system (10) as described in claim 1, wherein the stent length is 15-30 mm, and the two ends of the stent are slightly flared outward, forming a trumpet shape, which is used to fix the stent to the vascular endothelium and prevent the stent from shifting; the development point of the stent is set on the first connecting rod at the left and right ends of the stent, and the connecting rod is a long connecting rod or a short connecting rod.

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