A vascular stent system

Abstract

The present invention relates to a vascular stent system, which comprises a stent assembly and a delivery system. The stent assembly comprises a plurality of self-expanding stent units arranged axially and independently of each other. The delivery system comprises an inner tube, a connector, an outer sheath tube, an operating handle, a first release mechanism and a second release mechanism. A plurality of limiting portions spaced along the axial direction of the inner tube are fixedly arranged on the outer side of the inner tube. The self-expanding stent unit is sleeved on the inner tube and a self-expanding stent unit is provided between two adjacent limiting portions. The connector is used to movably connect and restrain the self-expanding stent unit on the inner tube. The outer sheath tube is relatively movably sleeved on the inner tube. The operating handle is arranged at the proximal end of the outer sheath tube and the inner tube. The first release mechanism is arranged between the operating handle and the outer sheath tube, and is used to drive the outer sheath tube to slide relative to the inner tube along the axial direction of the inner tube. The second release mechanism is arranged on the operating handle and / or the inner tube, and is used to disconnect the connection between the self-expanding stent unit and the inner tube.

Description

Technical Field

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

[0002] Atherosclerosis often leads to various diseases and even threatens life. For example, atherosclerosis of the coronary arteries that supply blood to the heart can lead to stenosis of the coronary artery lumen, insufficient blood supply to the myocardium, and cause angina pectoris. If the atherosclerotic plaques rupture, secondary thrombosis will form, blocking the coronary arteries, which can cause myocardial infarction. Atherosclerosis of cerebral blood vessels can lead to stenosis or blockage of the blood vessels that supply blood to the brain tissue, causing stroke. Atherosclerosis of the carotid arteries can cause stenosis or blockage of the carotid arteries, leading to cerebral infarction. If the atherosclerotic plaques rupture, the fragments fall off and block the cerebral arteries with the blood flow, which can cause cerebral infarction. Atherosclerosis of the lower limb arteries can cause peripheral vascular disease. Patients may experience claudication in the early stages, followed by various complications due to insufficient blood supply to the lower limbs. Severe cases may even require amputation.

[0003] At present, the two most common intracavitary interventional procedures used to treat the above-mentioned diseases are percutaneous intracavitary balloon dilatation and intracavitary stent implantation. The patency rate of the former varies in different parts, but is much lower than that of the latter.

[0004] The vascular stents used in intraluminal stent implantation are mainly divided into two categories: cutting type and braided type. Braided stents are mainly woven by metal wires and are formed as an integral braid. The cutting stent includes multiple closed rings distributed along the axial intervals, and a connecting part for connecting two adjacent closed rings. The braided stent has certain flexibility and fatigue resistance, but the axial shortening rate is very high and the radial support force is relatively weak; while the cutting stent usually has good radial support force and a small axial shortening rate, but its fatigue resistance and flexibility are poor. On the basis of the two, there are also coated stents that use polymer films as carriers and braided or cut closed rings as support structures. Their axial shortening rate is higher than that of the cutting stent, and their fatigue resistance and flexibility are stronger than those of the braided stent, but the maximum compressible loading outer diameter is large, which is difficult to apply to the above-mentioned smaller diameter blood vessels.

[0005] Due to the influence of calcification on both sides of the vascular wall of the lesion site, there is a large gradient difference between the inner diameter of the vascular wall and the normal vascular site. At the same time, the original site of the vascular is not uniform in diameter from an anatomical point of view. Therefore, after the above-mentioned mainstream stent is implanted in the human body, the radial force applied to the vascular wall by the above-mentioned mainstream stent during the manufacturing stage and the outer diameter of the stent in the released state cannot meet the optimal working state, so there are: 1. The radial force is too low or the outer diameter is too small: the radial force of the stent implanted in the lesion site is insufficient, resulting in stent collapse or displacement of the stent in the normal vascular site; 2. The radial force is too high or the outer diameter is too large: the transition expansion of the stent implanted in the normal vascular site causes damage to the blood vessel; 3. The adjacent units of the stent implanted in the site with a large gradient difference in the inner diameter of the blood vessel affect each other, resulting in the metal rod breaking and damaging the vascular wall. And the above problems are more obvious when long-specification stents are implanted. Therefore, for lesions with large changes in inner diameter, there is basically no stent system that can flexibly adjust the inner diameter of the stent according to the changes in the inner diameter of the blood vessel. The existing stent system still has lesion positions that cannot be overcome, especially the lower limb arteries with large movement amplitudes and large changes in inner diameter. At present, there is still no mainstream vascular stent available for the knee.

[0006] There is an urgent need for a bullet-loaded, modular stent in which adjacent support rings are independent of each other in the released state and radial forces and outer diameters do not affect each other. Summary of the invention

[0007] The purpose of the present invention is to provide a stent system which can highly match the change of the inner diameter of the blood vessel in the released state and has better compliance and fatigue resistance, and can be used for arterial blood vessels with frequent movement and complex working conditions.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] A blood vessel stent system comprises a stent assembly and a delivery system.

[0010] The stent assembly comprises a plurality of self-expanding stent units which are arranged axially and independently arranged. The self-expanding stent units are annular and have a radially expanded state and a radially compressed state.

[0011] The delivery system includes an inner tube, a connector, an outer sheath tube, an operating handle, a first release mechanism, and a second release mechanism. A plurality of limiting parts are fixedly arranged on the outer side of the inner tube, and the plurality of limiting parts are spaced along the axial direction of the inner tube. The self-expanding stent unit is sleeved on the inner tube, and one self-expanding stent unit is arranged between two adjacent limiting parts; the connector is used to movably connect and bind each self-expanding stent unit to the inner tube; the outer sheath tube is relatively movably sleeved on the inner tube; the operating handle is arranged at the proximal ends of the outer sheath tube and the inner tube; the first release mechanism is arranged between the operating handle and the outer sheath tube, and is used to drive the outer sheath tube to slide relative to the inner tube along the axial direction of the inner tube; the second release mechanism is arranged on the operating handle and / or the inner tube, and is used to disconnect the connection between each self-expanding stent unit and the inner tube.

[0012] The vascular stent system of the present invention has an assembled state, a partially released state and a completely released state.

[0013] When the vascular stent system is in the assembled state, the self-expanding stent unit is located between the inner tube and the outer sheath and is connected to the inner tube through the connector. The self-expanding stent unit is in the radially compressed state and has a movement tendency to transform from the radially compressed state to the radially deployed state.

[0014] When the vascular stent system is in the partially released state, the self-expanding stent unit is located outside the inner tube and the outer sheath tube and is still connected and bound to the inner tube by the connector, and the self-expanding stent unit is in the radially expanded state.

[0015] When the vascular stent system is in the fully released state, the self-expanding stent unit is located outside the inner tube and the outer sheath tube and is disconnected from the inner tube, and the self-expanding stent unit is in the radially expanded state.

[0016] According to some embodiments, the connector is a wire harness, the wire harness is partially fixedly connected to the inner tube, an annular cavity extending along its axial direction is formed in the inner tube, a plurality of through holes are opened on the outer wall of the inner tube along its axial direction to connect the annular cavity with the outside, one end of the wire harness passes through the through holes and the self-expanding stent unit in sequence along the axial direction of the annular cavity and is connected to the other end thereof to form an annular coil and connect and bind the self-expanding stent unit to the inner tube, the wire harness is basically located in the annular cavity, when the vascular stent system is in the assembled state, the wire harness is in a relaxed state, and when the vascular stent system is in the partially released state, the wire harness is in a tensioned state. The second release mechanism includes a movable cutting component arranged on the operating handle and / or the inner tube, and when the cutting component contacts the wire harness, the wire harness can be cut off so that the annular coil is disconnected to become a line segment fixedly connected to the inner tube.

[0017] Preferably, the through holes include a plurality of rows arranged at intervals along the circumferential direction of the inner tube, and the wiring harness includes a plurality of wires arranged at intervals along the circumferential direction of the inner tube.

[0018] More preferably, the self-expanding stent unit comprises a wavy annular structure forming crests and troughs in the circumferential direction, and crests and / or troughs of different self-expanding stent units located in the same radial direction are connected and bound to the inner tube by the same wire harness.

[0019] More preferably, the proximal end of the inner tube extends to the outside of the proximal end of the operating handle, a fixing block is provided at the proximal end of the inner tube, the cutting component is arranged at the proximal end of the inner tube and is located on the outside of the fixing block, the wiring harness is wound around the fixing block and is partially located between the cutting component and the outer surface of the fixing block, and when the cutting component is acted upon by an external force and approaches the fixing block, it can contact the wiring harness and cut it off.

[0020] More preferably, the material of the connector is a degradable or non-degradable material, for example, it is composed of a single strand of non-degradable suture, and the material is preferably a polymer material PET; the material of the sharp blade of the cutting component for cutting the connector is preferably stainless steel, such as SUS304; the materials of other components of the vascular stent system are preferably polymer materials, including but not limited to PEBAX, PEEK, PC, ABS, PP, POM, PE.

[0021] According to other embodiments, the connecting member includes a plurality of members arranged at intervals along the axial direction of the inner tube, the connecting member is a wiring harness, an annular cavity extending along its axial direction is formed in the inner tube, a plurality of through holes connecting the annular cavity with the outside are opened on the outer wall of the inner tube along its axial direction, the second release mechanism is a push rod which can be slidably arranged in the annular cavity along the axial direction of the annular cavity, the push rod extends along the axial direction of the annular cavity, a plurality of strip grooves are opened on the push rod along the axial direction thereof, a cutting component is provided at the proximal end of the strip groove and the cutting component can cut off the connecting member when it contacts the connecting member, one end of the connecting member is fixedly connected to the push rod, and the other end passes through a through hole and then through a self-expanding stent unit, then passes through the same through hole and then through a strip groove, and finally is fixedly connected to the inner wall of the annular cavity. When the vascular stent system is in the assembled state, the through hole through which the connector passes is far away from the strip groove and the through hole is in the distal direction of the strip groove, and the portion of the connector located in the strip groove is in contact with the distal end of the strip groove. When the vascular stent system is in the partially released state, the through hole through which the connector passes is close to and roughly aligned with the strip groove, and the connector is roughly located in the middle of the strip groove.

[0022] Preferably, the through holes include multiple rows spaced apart along the circumference of the inner tube, the connecting members include multiple rows spaced apart along the circumference of the inner tube, the push rod is tubular coaxial with the inner tube and the strip grooves include multiple rows spaced apart along the circumference of the push rod.

[0023] Preferably, the self-expanding stent unit comprises a wavy annular structure with crests and troughs formed in the circumferential direction, and the crests and / or troughs of each of the self-expanding stent units are respectively connected and bound to the inner tube by one of the connecting members.

[0024] More preferably, the proximal end of the inner tube extends to the outside of the proximal end of the operating handle, the proximal end of the inner tube is provided with an avoidance groove extending from its proximal end to the distal end, the proximal end of the push rod extends to the outside of the proximal end of the inner tube, the proximal end of the push rod is provided with a push-pull portion, and the push-pull portion can be slidably inserted in the avoidance groove.

[0025] More preferably, the material of the connector is a degradable or non-degradable material; the material of the sharp blade of the cutting component for cutting the connector is preferably stainless steel, such as SUS304; the materials of other components of the vascular stent system are preferably polymer materials, including but not limited to PEBAX, PEEK, PC, ABS, PP, POM, PE; the material of the connector is a double-strand metal material.

[0026] More preferably, the connection method of the connecting piece to the push rod and the inner tube includes but is not limited to bonding, welding or tying a knot.

[0027] According to some further embodiments, the connector includes a plurality of connectors arranged at intervals along the axial direction of the inner tube, the connector is a wire harness loop wound around the self-expanding stent unit, an annular cavity extending along the axial direction thereof is formed in the inner tube, a plurality of through holes are opened on the outer wall of the inner tube along the axial direction thereof to connect the annular cavity with the outside, the second release mechanism includes a push rod slidably arranged in the annular cavity along the axial direction of the annular cavity, the push rod extends along the axial direction of the annular cavity, a plurality of deformable hooks are arranged at intervals along the axial direction of the push rod, the hook includes an arm and a hook, one end of the arm is relatively rotatably connected to the inner tube, and the hook is arranged on the other end of the arm. When the vascular stent system is in the assembled state, the hook is located in the annular cavity, a portion of the connector passes through a through hole to be matched and connected with the hook, and the hook of the hook is located below the through hole. When the vascular stent system is in the partially released state, the arm of the hook passes through the through hole and is tightened, the hook is connected with the connector, and the connection between the arm and the inner tube is located below the through hole. When the vascular stent system is in the fully released state, the arm of the hook passes through the through hole, the hook is separated from the connector, and the connection between the arm and the inner tube is located in the distal direction of the through hole.

[0028] Preferably, the through holes include a plurality of rows spaced apart along the circumference of the inner tube, the self-expanding stent unit includes a wavy circular ring structure forming crests and troughs in the circumferential direction, each crest and / or trough of the self-expanding stent unit is respectively provided with one of the connecting pieces, the push rod is tubular and coaxial with the inner tube, and the hook includes a plurality of rows spaced apart along the circumference of the push rod.

[0029] More preferably, the proximal end of the inner tube extends to the outside of the proximal end of the operating handle, the proximal end of the inner tube is provided with an avoidance groove extending from its proximal end to the distal end, the proximal end of the push rod extends to the outside of the proximal end of the inner tube, the proximal end of the push rod is provided with a push-pull portion, and the push-pull portion is located in the avoidance groove.

[0030] In this embodiment, after the outer sheath is withdrawn, the position of the self-expanding stent unit can be fine-tuned by manipulating the wire harness at the proximal end of the inner tube.

[0031] More preferably, the material of the connecting piece and the push rod are both NiTi wire; the material of the connecting piece is composed of a single strand of degradable suture, and the material is preferably the polymer material PLGA; the materials of other components of the vascular stent system are preferably polymer materials, including but not limited to PEBAX, PEEK, PC, ABS, PP, POM, PE.

[0032] Preferably, the number of crests and troughs of each of the self-expandable stent units is equal.

[0033] Preferably, the first release mechanism includes a rack and gear assembly that are mutually matched and connected and are arranged on the operating handle, the distal end of the rack is fixedly connected to the outer sheath, the operating handle is fixedly connected to the proximal end of the inner tube, and the gear assembly is rotatably arranged on the operating handle, and the gear assembly can drive the rack to move along its axial direction when working.

[0034] More preferably, the gear assembly includes a driving wheel and a driven wheel. The driving wheel is rotatably arranged on the operating handle, and the driven wheel, the driving wheel and the rack are matched and connected. When an external force rotates the driving wheel, the driving wheel drives the driven wheel to rotate and then drives the rack to move, thereby driving the outer sheath tube to slide relative to the inner tube.

[0035] In the present invention, the diameters of the different stent units in the expanded state are equal or different. Specifically, different self-expanding stent units can be selected according to the changes in the inner diameters of the vascular lesion part and the blood vessels nearby.

[0036] Preferably, a guide portion is provided at the distal end of the inner tube, and the guide portion always extends out of the distal end of the outer sheath tube. The guide portion is used to guide the stent assembly to the lesion.

[0037] Preferably, each of the self-expanding stent units is provided with a development mark for intraoperative and postoperative positioning of the stent assembly.

[0038] Preferably, each of the self-expanding stent units is made of nickel-titanium alloy.

[0039] The present invention also provides a method for using the above-mentioned vascular stent system, and the method for using is as follows:

[0040] (1) Exhaust the vascular stent system;

[0041] (2) Guide the vascular stent system into the lesion site along the guide wire and adjust the vascular stent system to the expected position;

[0042] (3) operating the first release mechanism to withdraw the outer sheath and expand the self-expanding stent unit;

[0043] (4) operating the first release mechanism to disconnect the self-expanding stent unit from the inner tube;

[0044] (5) Remove the delivery system from the body.

[0045] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0046] The stent components in the vascular stent system of the present invention are independently set up, and are state-type, modular stents in which radial force and outer diameter do not affect each other. The delivery and release of the above-mentioned stent components are achieved through a matching delivery system. When the vascular stent system of the present invention is used, the size of each independent self-expanding stent unit can be selected according to the stenosis of the blood vessels in the lesion site of the patient and the inner diameter of the adjacent normal blood vessels, so that the stent component has better adaptability to meet the human anatomy. Compared with the coated stent, the vascular stent system of the present invention has a smaller loading outer diameter, which greatly improves the passability of the delivery system and can be used in severely narrowed blood vessels that the coated stent delivery system cannot reach. Compared with other mainstream stents (braided stents, cutting stents), the self-expanding stent units in the present invention are not connected to each other, which greatly enhances the compliance and fatigue resistance of the stent component, and can be used in arterial blood vessels with frequent movements and complex working conditions, such as the lower limbs below the knee artery where current stent implantation cannot be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 Schematic diagram of the overall structure of an embodiment of the vascular stent system of the present invention (the distal end is partially in cross-section);

[0049] Figure 2 for Figure 1 The schematic diagram of the state of the distal end of the vascular stent system at the lesion site is shown;

[0050] Figure 3 for Figure 1 The schematic diagram of the state of the stent assembly in the vascular stent system at the lesion site is shown;

[0051] Figure 4 for Figure 1 A schematic structural diagram of a self-expanding stent unit in a vascular stent system shown;

[0052] Figure 5 for Figure 1 A schematic diagram of a partial structure of an inner tube in the vascular stent system shown (the limiting part is not shown);

[0053] Figure 6 is a schematic cross-sectional structural diagram of the vascular stent system of Example 1 in an assembled state;

[0054] Figure 7 for Figure 6 The enlarged view of point A in the middle;

[0055] Figure 8 for Figure 6 The enlarged view of point B in the middle;

[0056] Fig. 9 is a schematic cross-sectional structural diagram of the vascular stent system of Example 1 in a partially released state;

[0057] Fig.10 for Fig. 9 Enlarged view of point C in the middle;

[0058] Fig.11 for Fig. 9 The enlarged view of point D in the middle;

[0059] Fig.12 is a schematic cross-sectional structural diagram of the vascular stent system of Example 1 in a fully released state (the delivery system withdrawn portion);

[0060] Fig.13 for Fig.12 Enlarged view of point E in the middle;

[0061] Fig.14 is a schematic cross-sectional structural diagram of the vascular stent system of Example 2 in an assembled state;

[0062] Fig.15 for Fig.14 The enlarged view of F in the middle;

[0063] Fig.16 is a schematic cross-sectional structural diagram of the vascular stent system of Example 2 in a partially released state;

[0064] Fig.17 for Fig.16 Enlarged view of G in the middle;

[0065] Fig.18 is a schematic cross-sectional structural diagram of the vascular stent system of Example 2 in a partially released state (a state when the cutting component cuts the connecting piece);

[0066] Fig.19 for Fig.18 The enlarged view of the H in the middle;

[0067] Fig. 20 is a schematic cross-sectional structural diagram of the vascular stent system of Example 2 in a fully released state;

[0068] Fig.21 for Fig. 20 The enlarged view of point I in the middle;

[0069] Fig. 22 is a schematic cross-sectional structural diagram of the vascular stent system of Example 3 in an assembled state;

[0070] Fig.23 for Fig. 22 The enlarged view of J in the middle;

[0071] Fig.24 is a schematic cross-sectional structural diagram of the vascular stent system of Example 3 in a partially released state;

[0072] Fig.25 for Fig.24 Enlarged view of K in the middle;

[0073] Fig.26 is a schematic cross-sectional structural diagram of the vascular stent system of Example 3 in a partially released state (the hook portion is separated from the connector);

[0074] Fig. 27 for Fig.26 Enlarged view of L in the middle;

[0075] Fig.28 is a schematic cross-sectional structural diagram of the vascular stent system of Example 3 in a fully released state;

[0076] Fig.29 for Fig.28 The enlarged view of M in the middle.

[0077] In the above picture:

[0078] 11. Self-expanding stent unit; 111. trough; 112. crest; 21. inner tube; 211. limiter; 212. annular cavity; 213. through hole; 214. fixing block; 215. push rod; 2151. strip groove; 216. hook; 22. connector; 23. outer sheath; 24. operating handle; 25. first release mechanism; 251. rack; 252. driving wheel; 253. driven wheel; 26. second release mechanism, 261. cutting component; 3. blood vessel; 4. Luer connector. DETAILED DESCRIPTION

[0079] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0080] In the description of the present invention, it is necessary to understand that the distal end refers to the end of the instrument or component away from the operator, and the proximal end refers to the end of the instrument or component close to the operator; the axial direction refers to the direction parallel to the line connecting the distal and proximal centers of the instrument or component, and the radial direction refers to the direction perpendicular to the axial direction; the inner and outer are positions defined by the distance relative to the center of the instrument or component, wherein the inner is a position close to the center of the instrument or component, and the outer is a position far from the center of the instrument or component. The description of the above-mentioned directional words is only for the convenience of describing the embodiments of the present invention and simplifying the description, and does 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 the embodiments of the present invention.

[0081] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0082] In the description of the present invention, a plurality refers to two or more.

[0083] The annular cavity 212 on the inner tube 21 of the present invention can also be used for preoperative injection and exhaust.

[0084] The degradable material described in the present invention refers to a material that can be completely degraded in the body within one to fifteen days.

[0085] The disclosure below provides many different implementations or examples to implement different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present invention.

[0086] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. Example 1

[0087] This embodiment provides a vascular stent system and a method of using the same. Figure 6~Figure 13 As shown, the vascular stent system of this embodiment includes a stent assembly and a delivery system.

[0088] Specifically, the stent assembly includes a plurality of axially arranged and independently arranged self-expanding stent units 11, the self-expanding stent units 11 are annular and have a radially expanded state and a radially compressed state. In this embodiment, the self-expanding stent unit 11 includes a wavy annular structure with crests 112 and troughs 111 formed in the circumferential direction.

[0089] Specifically, the delivery system includes an inner tube 21, a connector 22, an outer sheath tube 23, an operating handle 24, a first release mechanism 25, and a second release mechanism 26. A plurality of limit portions 211 are fixedly arranged on the outer side of the inner tube 21, and the plurality of limit portions 211 are spaced apart along the axial direction of the inner tube 21. The self-expanding stent unit 11 is sleeved on the inner tube 21, and a self-expanding stent unit 11 is arranged between two adjacent limit portions 211; the connector 22 is used to movably connect and bind each self-expanding stent unit 11 to the inner tube 21; the outer sheath tube 23 is relatively movably sleeved on the inner tube 21; the operating handle 24 is arranged at the proximal ends of the outer sheath tube 23 and the inner tube 21; the first release mechanism 25 is arranged between the operating handle 24 and the outer sheath tube 23, and is used to drive the outer sheath tube 23 to slide relative to the inner tube 21 along the axial direction of the inner tube 21; the second release mechanism 26 is arranged on the operating handle 24 and / or the inner tube 21, and is used to disconnect the connection between each self-expanding stent unit 11 and the inner tube 21. The vascular stent system of the present invention has an assembled state, a partially released state and a completely released state.

[0090] In this embodiment, when the vascular stent system is in an assembled state, the self-expanding stent unit 11 is located between the inner tube 21 and the outer sheath tube 23 and is connected to the inner tube 21 through the connector 22, and the self-expanding stent unit 11 is in a radially compressed state and has a movement tendency to convert from the radially compressed state to the radially expanded state. When the vascular stent system is in a partially released state, the self-expanding stent unit 11 is located outside the inner tube 21 and the outer sheath tube 23 and is still connected and bound to the inner tube 21 by the connector 22, and the self-expanding stent unit 11 is in a radially expanded state. When the vascular stent system is in a fully released state, the self-expanding stent unit 11 is located outside the inner tube 21 and the outer sheath tube 23 and is disconnected from the inner tube 21, and the self-expanding stent unit 11 is in a radially expanded state.

[0091] More specifically, in this embodiment, the connector 22 is a wire harness, which is partially fixedly connected to the inner tube 21, and an annular cavity 212 extending along its axial direction is formed in the inner tube 21. A plurality of through holes 213 are opened on the outer wall of the inner tube 21 along its axial direction to connect the annular cavity 212 with the outside, and one end of the wire harness passes through the through holes 213 and the self-expanding stent unit 11 in sequence along the axial direction of the annular cavity 212 and is connected to the other end thereof to form an annular coil and connect the self-expanding stent unit 11 to the inner tube 21. The wire harness is basically located in the annular cavity 212. When the vascular stent system is in an assembled state, the wire harness is in a relaxed state, and when the vascular stent system is in a partially released state, the wire harness is in a tensioned state. The second release mechanism 26 includes a movable cutting component 261 arranged on the inner tube 21. When the cutting component 261 contacts the wire harness, the wire harness can be cut off so that the annular coil is disconnected to become a line segment fixedly connected to the inner tube 21.

[0092] More specifically, in this embodiment, the through holes 213 include multiple rows arranged at intervals along the circumference of the inner tube 21, the wiring harness includes multiple rows arranged at intervals along the circumference of the inner tube 21, and the crests 112 and troughs 111 located in the same radial direction of different self-expandable stent units 11 are connected and bound to the inner tube 21 by the same wiring harness.

[0093] More specifically, in this embodiment, the proximal end of the inner tube 21 extends to the outside of the proximal end of the operating handle 24, and a fixing block 214 is provided at the proximal end of the inner tube 21. The cutting component 261 is arranged at the proximal end of the inner tube 21 and is located on the outside of the fixing block 214. The wiring harness is wound around the fixing block 214 and is partially located between the cutting component 261 and the outer surface of the fixing block 214. When the cutting component 261 is acted upon by an external force and approaches the fixing block 214, it can contact the wiring harness and cut it off.

[0094] More specifically, in this embodiment, the first release mechanism 25 includes a rack 251 and a gear assembly that are mutually matched and connected and are arranged on the operating handle 24. The distal end of the rack 251 is fixedly connected to the outer sheath 23, and the operating handle 24 is fixedly connected to the proximal end of the inner tube 21. The gear assembly is rotatably arranged on the operating handle 24, and the gear assembly can drive the rack 251 to move along its axial direction when working. The gear assembly includes a driving wheel 252 and a driven wheel 253. The driving wheel 252 is rotatably arranged on the operating handle 24, and the driven wheel 253, the driving wheel 252 and the rack 251 are matched and connected. When an external force rotates the driving wheel 252, the driving wheel 252 drives the driven wheel 253 to rotate and then drives the rack 251 to move, thereby driving the outer sheath 23 to slide relative to the inner tube 21.

[0095] More specifically, in this embodiment, the material of the connector 22 is a double-stranded NiTi wire; the material of the sharp edge of the cutting component 261 for cutting the connector 22 is SUS304; and the materials of other components of the vascular stent system are polymer materials.

[0096] More specifically, in this embodiment, the distal end of the inner tube 21 is provided with a guide portion, which always extends out of the distal end of the outer sheath tube 23. The guide portion is used to guide the stent assembly to the lesion. Each self-expanding stent unit 11 is provided with a developing mark for positioning the stent assembly during and after surgery. Each self-expanding stent unit 11 is made of nickel-titanium alloy.

[0097] The method of using this embodiment is as follows:

[0098] (1) injecting heparin saline into the annular cavity 212 to exhaust the vascular stent system (injecting liquid through the Luer connector 4 detachably mounted at the proximal end of the inner tube 21);

[0099] (2) introducing the vascular stent system into the lesion site of blood vessel 3 along the guide wire, and adjusting the vascular stent system to the expected position;

[0100] (3) Rotating the driving wheel 252 to withdraw the outer sheath 23, and the self-expanding stent unit 11 expands;

[0101] (4) Pressing the cutting component 261 to cut off the connecting piece 22;

[0102] (5) Remove the delivery system from the body. Example 2

[0103] This embodiment provides another vascular stent system and a method of using the same. Figure 14 to Figure 21 shown.

[0104] The vascular stent system of this embodiment includes a stent assembly and a delivery system, wherein the stent assembly is the same as that of Example 1, and the delivery system is slightly different from that of Example 1.

[0105] Specifically, in this embodiment, the connecting member 22 includes a plurality of connecting members 22 arranged at intervals along the axial direction of the inner tube 21, the connecting member 22 is a wiring harness, an annular cavity 212 extending along its axial direction is formed in the inner tube 21, and a plurality of through holes 213 for connecting the annular cavity 212 with the outside are opened on the outer wall of the inner tube 21 along its axial direction, and the second release mechanism 26 is a push rod 215 slidably arranged in the annular cavity 212 along the axial direction of the annular cavity 212. The push rod 215 extends along the annular cavity 212. The push rod 215 extends axially, and a plurality of strip grooves 2151 are provided on the push rod 215 at intervals along the axial direction thereof. A cutting component 261 is provided at the proximal end of the strip groove 2151, and the cutting component 261 can cut off the connecting member 22 when it contacts the connecting member 22. One end of the connecting member 22 is fixedly connected to the push rod 215, and the other end passes through a through hole 213 and then through a self-expanding stent unit 11, and then passes through the same through hole 213 and then through a strip groove 2151, and finally is fixedly connected to the inner wall of the annular cavity 212. When the vascular stent system is in an assembled state, the through hole 213 through which the connector 22 passes is far away from the strip groove 2151 and the through hole 213 is in the distal direction of the strip groove 2151. The portion of the connector 22 located in the strip groove 2151 is in contact with the distal end of the strip groove 2151. When the vascular stent system is in a partially released state, the through hole 213 through which the connector 22 passes is close to and roughly aligned with the strip groove 2151, and the connector 22 is roughly located in the middle of the strip groove 2151.

[0106] Specifically, in this embodiment, the through hole 213 includes multiple rows arranged at circumferential intervals along the inner tube 21, the connecting piece 22 includes multiple rows arranged at circumferential intervals along the inner tube 21, the push rod 215 is tubular coaxial with the inner tube 21 and the strip groove 2151 includes multiple rows arranged at circumferential intervals along the push rod 215.

[0107] Specifically, in this embodiment, the self-expanding stent unit 11 includes a wavy annular structure with crests 112 and troughs 111 formed in the circumferential direction, and the troughs 111 at the proximal end of each self-expanding stent unit 11 are connected and bound to the inner tube 21 by a connector 22 .

[0108] Specifically, in this embodiment, the proximal end of the inner tube 21 extends to the outside of the proximal end of the operating handle 24, and the proximal end of the inner tube 21 is provided with an avoidance groove extending from its proximal end to the distal end. The proximal end of the push rod 215 extends to the outside of the proximal end of the inner tube 21, and the proximal end of the push rod 215 is provided with a push-pull portion, which can be slidably inserted in the avoidance groove.

[0109] Specifically, in this embodiment, the connector 22 is composed of non-degradable sutures, and the connector 22 is connected to the push rod 215 and the inner tube 21 by bonding; the sharp blade of the cutting component 261 for cutting the connector 22 is made of SUS304; the materials of other components of the vascular stent system are preferably polymer materials.

[0110] More specifically, in this embodiment, the distal end of the inner tube 21 is provided with a guide portion, which always extends out of the distal end of the outer sheath tube 23. The guide portion is used to guide the stent assembly to the lesion. Each self-expanding stent unit 11 is provided with a developing mark for positioning the stent assembly during and after surgery. Each self-expanding stent unit 11 is made of nickel-titanium alloy.

[0111] The method of using this embodiment is as follows:

[0112] (1) injecting heparin saline into the annular cavity 212 to exhaust the vascular stent system (injecting liquid through the Luer connector 4 detachably mounted at the proximal end of the inner tube 21);

[0113] (2) introducing the vascular stent system into the lesion site of blood vessel 3 along the guide wire, and adjusting the vascular stent system to the expected position;

[0114] (3) Rotating the driving wheel 252 to withdraw the outer sheath 23, and the self-expanding stent unit 11 expands;

[0115] (4) Pushing the push rod 215 toward the distal end of the inner tube 21 to cut off the connecting piece 22;

[0116] (5) Remove the delivery system from the body. Example 3

[0117] This embodiment provides another vascular stent system and a method of using the same. Figure 22~Figure 29 shown.

[0118] The vascular stent system of this embodiment includes a stent assembly and a delivery system, wherein the stent assembly is the same as that of Example 1, and the delivery system is slightly different from that of Example 1.

[0119] Specifically, in this embodiment, the connecting member 22 includes a plurality of connecting members 22 arranged at intervals along the axial direction of the inner tube 21. The connecting member 22 is a wire harness loop wound around the self-expanding stent unit 11. An annular cavity 212 extending along its axial direction is formed in the inner tube 21. A plurality of through holes 213 connecting the annular cavity 212 with the outside are opened on the outer wall of the inner tube 21 along its axial direction. The second release mechanism 26 includes a push rod 215 slidably arranged in the annular cavity 212 along the axial direction of the annular cavity 212. The push rod 215 extends along the axial direction of the annular cavity 212. A plurality of deformable hooks 216 are arranged on the push rod 215 along its axial direction. The hook 216 includes an arm portion and a hook portion. One end of the arm portion is relatively rotatably connected to the inner tube 21, and the hook portion is arranged on the other end of the arm portion. When the vascular stent system is in an assembled state, the hook 216 is located in the annular cavity 212, a portion of the connector 22 passes through a through hole 213 and is connected to the hook portion, and the hook portion of the hook 216 is located below the through hole 213. When the vascular stent system is in a partially released state, the arm of the hook 216 passes through the through hole 213 and is tightened, the hook portion is connected to the connector 22, and the connection between the arm and the inner tube 21 is located below the through hole 213. When the vascular stent system is in a fully released state, the arm of the hook 216 passes through the through hole 213, the hook portion is separated from the connector 22, and the connection between the arm and the inner tube 21 is located in the distal direction of the through hole 213.

[0120] Specifically, in this embodiment, the through hole 213 includes a plurality of rows arranged at intervals along the circumference of the inner tube 21, the self-expanding stent unit 11 includes a wavy circular ring structure forming crests 112 and troughs 111 in the circumferential direction, and each self-expanding stent unit 11 is provided with a connecting piece 22 at the proximal trough 111, the push rod 215 is tubular and coaxial with the inner tube 21, and the hook 216 includes a plurality of rows arranged at intervals along the circumference of the push rod 215.

[0121] Specifically, in this embodiment, the proximal end of the inner tube 21 extends to the outside of the proximal end of the operating handle 24, and the proximal end of the inner tube 21 is provided with an avoidance groove extending from its proximal end to the distal end. The proximal end of the push rod 215 extends to the outside of the proximal end of the inner tube 21, and the proximal end of the push rod 215 is provided with a push-pull portion, which is located in the avoidance groove.

[0122] Specifically, in this embodiment, the push rod 215 and the hook 216 are made of NiTi wire; the connector 22 is made of a single strand of degradable suture thread, made of PLGA; and the materials of other components of the vascular stent system are preferably polymer materials.

[0123] More specifically, in this embodiment, the distal end of the inner tube 21 is provided with a guide portion, which always extends out of the distal end of the outer sheath tube 23. The guide portion is used to guide the stent assembly to the lesion. Each self-expanding stent unit 11 is provided with a developing mark for positioning the stent assembly during and after surgery. Each self-expanding stent unit 11 is made of nickel-titanium alloy.

[0124] The method of using this embodiment is as follows:

[0125] (1) injecting heparin saline into the annular cavity 212 to exhaust the vascular stent system (injecting liquid through the Luer connector 4 detachably mounted at the proximal end of the inner tube 21);

[0126] (2) introducing the vascular stent system into the lesion site of blood vessel 3 along the guide wire, and adjusting the vascular stent system to the expected position;

[0127] (3) Rotating the driving wheel 252 to withdraw the outer sheath 23, and the self-expanding stent unit 11 expands;

[0128] (4) Pushing the push rod 215 toward the distal end of the inner tube 21 to separate the hook portion from the connecting member 22;

[0129] (5) Remove the delivery system from the body.

[0130] The above embodiments 1 to 3 can avoid the problem of mainstream stent over-expansion damaging blood vessels by selecting self-expanding stent units 11 with large gradient and appropriate outer diameter. At the same time, each expandable stent unit 11 is independent of each other, which greatly avoids stress concentration phenomenon and can be used for below-knee blood vessels.

[0131] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vascular stent system, characterized in that: The vascular stent system comprises: A stent assembly comprising a plurality of self-expanding stent units (11) arranged axially and independently of each other, wherein the self-expanding stent units (11) are annular and each has a radially expanded state and a radially compressed state; A conveying system comprising: An inner tube (21) having a plurality of stoppers (211) fixedly disposed on its exterior, the plurality of stoppers (211) being spaced apart along the axial direction of the inner tube (21), the self-expanding stent unit (11) being sleeved on the inner tube (21) and one of the self-expanding stent units (11) being disposed between two adjacent stoppers (211); A connecting piece (22) used to movably connect and bind each of the self-expanding stent units (11) to the inner tube (21); An outer sheath tube (23) which is relatively movably sleeved on the inner tube (21); An operating handle (24) disposed at the proximal ends of the outer sheath tube (23) and the inner tube (21); a first release mechanism (25), which is disposed between the operating handle (24) and the outer sheath tube (23) and is used to drive the outer sheath tube (23) to slide relative to the inner tube (21) along the axial direction of the inner tube (21); a second release mechanism (26), which is arranged on the operating handle (24) and / or the inner tube (21), and is used to disconnect the connection between each of the self-expanding stent units (11) and the inner tube (21), The vascular stent system has an assembled state, a partially released state and a fully released state. When the vascular stent system is in the assembled state, the self-expanding stent unit (11) is located between the inner tube (21) and the outer sheath tube (23) and is connected to the inner tube (21) via the connecting piece (22); the self-expanding stent unit (11) is in the radially compressed state and has a movement tendency to transform from the radially compressed state to the radially deployed state. When the vascular stent system is in the partially released state, the self-expanding stent unit (11) is located outside the inner tube (21) and the outer sheath tube (23) and is still connected and restrained to the inner tube (21) by the connecting piece (22); the self-expanding stent unit (11) is in the radially expanded state. When the vascular stent system is in the fully released state, the self-expanding stent unit (11) is located outside the inner tube (21) and the outer sheath tube (23) and is disconnected from the inner tube (21), and the self-expanding stent unit (11) is in the radially expanded state. The connecting member (22) is a wire harness, and the wire harness is partially fixedly connected to the inner tube (21). An annular cavity (212) extending in the axial direction thereof is formed in the inner tube (21); a plurality of through holes (213) for connecting the annular cavity (212) with the outside are formed on the outer wall of the inner tube (21) along the axial direction thereof; one end of the wire harness passes through the through holes (213) and the self-expanding stent unit (11) in sequence along the axial direction of the annular cavity (212) and is connected to the other end thereof to form an annular coil and connect the self-expanding stent unit (11) to the inner tube (21); the wire harness is basically located in the annular cavity (212); When the vascular stent system is in the assembled state, the harness is in a relaxed state. When the vascular stent system is in the partially released state, the harness is in a tensioned state. The second release mechanism (26) comprises a movable cutting component (261) arranged on the operating handle (24) and / or the inner tube (21); when the cutting component (261) contacts the wire harness, it is capable of cutting the wire harness so that the annular coil is disconnected into a wire segment fixedly connected to the inner tube (21).

2. The vascular stent system according to claim 1, characterized in that: The through holes (213) include a plurality of rows arranged at intervals along the circumference of the inner tube (21), and the wiring harness includes a plurality of through holes (213) arranged at intervals along the circumference of the inner tube (21).

3. The vascular stent system according to claim 2, characterized in that: The self-expanding stent unit (11) comprises a wavy annular structure forming wave crests (112) and wave troughs (111) in the circumferential direction, and the wave crests (112) and / or wave troughs (111) of different self-expanding stent units (11) located in the same radial direction are connected and bound to the inner tube (21) by the same wire harness.

4. The vascular stent system according to claim 1, characterized in that: The proximal end of the inner tube (21) extends to the outside of the proximal end of the operating handle (24); a fixing block (214) is provided at the proximal end of the inner tube (21); the cutting component (261) is arranged at the proximal end of the inner tube (21) and is located outside the fixing block (214); the wire harness is wound around the fixing block (214) and is partially located between the cutting component (261) and the outer surface of the fixing block (214); when the cutting component (261) is acted upon by an external force and approaches the fixing block (214), it is able to contact the wire harness and cut it off.

5. A vascular stent system, characterized in that: The vascular stent system comprises: A stent assembly comprising a plurality of self-expanding stent units (11) arranged axially and independently of each other, wherein the self-expanding stent units (11) are annular and each has a radially expanded state and a radially compressed state; A conveying system comprising: An inner tube (21) having a plurality of stoppers (211) fixedly disposed on its exterior, the plurality of stoppers (211) being spaced apart along the axial direction of the inner tube (21), the self-expanding stent unit (11) being sleeved on the inner tube (21) and one of the self-expanding stent units (11) being disposed between two adjacent stoppers (211); A connecting piece (22) used to movably connect and bind each of the self-expanding stent units (11) to the inner tube (21); An outer sheath tube (23) which is relatively movably sleeved on the inner tube (21); An operating handle (24) disposed at the proximal ends of the outer sheath tube (23) and the inner tube (21); a first release mechanism (25), which is disposed between the operating handle (24) and the outer sheath tube (23) and is used to drive the outer sheath tube (23) to slide relative to the inner tube (21) along the axial direction of the inner tube (21); a second release mechanism (26), which is arranged on the operating handle (24) and / or the inner tube (21), and is used to disconnect the connection between each of the self-expanding stent units (11) and the inner tube (21), The vascular stent system has an assembled state, a partially released state and a fully released state. When the vascular stent system is in the assembled state, the self-expanding stent unit (11) is located between the inner tube (21) and the outer sheath tube (23) and is connected to the inner tube (21) via the connecting piece (22); the self-expanding stent unit (11) is in the radially compressed state and has a movement tendency to transform from the radially compressed state to the radially deployed state. When the vascular stent system is in the partially released state, the self-expanding stent unit (11) is located outside the inner tube (21) and the outer sheath tube (23) and is still connected and restrained to the inner tube (21) by the connecting piece (22); the self-expanding stent unit (11) is in the radially expanded state. When the vascular stent system is in the fully released state, the self-expanding stent unit (11) is located outside the inner tube (21) and the outer sheath tube (23) and is disconnected from the inner tube (21), and the self-expanding stent unit (11) is in the radially expanded state. The connecting member (22) comprises a plurality of connecting members (22) arranged at intervals along the axial direction of the inner tube (21); the connecting member (22) is a wiring harness; an annular cavity (212) extending along its axial direction is formed in the inner tube (21); a plurality of through holes (213) for connecting the annular cavity (212) with the outside are formed on the outer wall of the inner tube (21) along its axial direction; the second release mechanism (26) is a push rod (215) slidably arranged in the annular cavity (212) along the axial direction of the annular cavity (212); the push rod (215) is arranged along the axial direction of the annular cavity (212) The push rod (215) extends in a direction, and a plurality of strip grooves (2151) are provided on the push rod (215) along the axial direction thereof at intervals. A cutting component (261) is provided at the proximal end of the strip groove (2151), and the cutting component (261) can cut off the connecting member (22) when it contacts the connecting member (22). One end of the connecting member (22) is fixedly connected to the push rod (215), and the other end passes through a through hole (213), then passes through a self-expanding stent unit (11), then passes through the same through hole (213), and then passes through a strip groove (2151), and finally is fixedly connected to the inner wall of the annular cavity (212). When the vascular stent system is in the assembled state, the through hole (213) through which the connecting member (22) passes and the strip groove (2151) are separated from each other, and the through hole (213) is in the distal direction of the strip groove (2151), and the portion of the connecting member (22) located in the strip groove (2151) is in contact with the distal end of the strip groove (2151). When the vascular stent system is in the partially released state, the through hole (213) through which the connecting member (22) passes and the strip groove (2151) are close to and roughly aligned, and the connecting member (22) is roughly located in the middle of the strip groove (2151).

6. The vascular stent system according to claim 5, characterized in that: The through holes (213) include multiple rows spaced apart along the circumference of the inner tube (21), the connecting member (22) includes multiple rows spaced apart along the circumference of the inner tube (21), the push rod (215) is tubular and coaxial with the inner tube (21), and the strip grooves (2151) include multiple rows spaced apart along the circumference of the push rod (215).

7. The vascular stent system according to claim 6, characterized in that: The self-expanding stent unit (11) comprises a wavy annular structure with wave crests (112) and wave troughs (111) formed in the circumferential direction, and the wave crests (112) and / or wave troughs (111) of each of the self-expanding stent units (11) are connected and bound to the inner tube (21) by one of the connecting pieces (22).

8. A vascular stent system, characterized in that: The vascular stent system comprises: A stent assembly comprising a plurality of self-expanding stent units (11) arranged axially and independently of each other, wherein the self-expanding stent units (11) are annular and each has a radially expanded state and a radially compressed state; A conveying system comprising: An inner tube (21) having a plurality of stoppers (211) fixedly disposed on its exterior, the plurality of stoppers (211) being spaced apart along the axial direction of the inner tube (21), the self-expanding stent unit (11) being sleeved on the inner tube (21) and one of the self-expanding stent units (11) being disposed between two adjacent stoppers (211); A connecting piece (22) used to movably connect and bind each of the self-expanding stent units (11) to the inner tube (21); An outer sheath tube (23) which is relatively movably sleeved on the inner tube (21); An operating handle (24) disposed at the proximal ends of the outer sheath tube (23) and the inner tube (21); a first release mechanism (25), which is disposed between the operating handle (24) and the outer sheath tube (23) and is used to drive the outer sheath tube (23) to slide relative to the inner tube (21) along the axial direction of the inner tube (21); a second release mechanism (26), which is arranged on the operating handle (24) and / or the inner tube (21), and is used to disconnect the connection between each of the self-expanding stent units (11) and the inner tube (21), The vascular stent system has an assembled state, a partially released state and a fully released state. When the vascular stent system is in the assembled state, the self-expanding stent unit (11) is located between the inner tube (21) and the outer sheath tube (23) and is connected to the inner tube (21) via the connecting piece (22); the self-expanding stent unit (11) is in the radially compressed state and has a movement tendency to transform from the radially compressed state to the radially deployed state. When the vascular stent system is in the partially released state, the self-expanding stent unit (11) is located outside the inner tube (21) and the outer sheath tube (23) and is still connected and restrained to the inner tube (21) by the connecting piece (22); the self-expanding stent unit (11) is in the radially expanded state. When the vascular stent system is in the fully released state, the self-expanding stent unit (11) is located outside the inner tube (21) and the outer sheath tube (23) and is disconnected from the inner tube (21), and the self-expanding stent unit (11) is in the radially expanded state. The connecting member (22) comprises a plurality of connecting members (22) arranged at intervals along the axial direction of the inner tube (21); the connecting member (22) is a wire harness loop wound around the self-expanding stent unit (11); an annular cavity (212) extending along its axial direction is formed in the inner tube (21); a plurality of through holes for connecting the annular cavity (212) with the outside are opened on the outer wall of the inner tube (21) along its axial direction; the second release mechanism (26) comprises a push rod (215) slidably arranged in the annular cavity (212) along the axial direction of the annular cavity (212); the push rod (215) extends along the axial direction of the annular cavity (212); a plurality of deformable hooks (216) are arranged on the push rod (215) along its axial direction; the hook (216) comprises an arm portion and a hook portion; one end of the arm portion is relatively rotatably connected to the inner tube (21); the hook portion is arranged on the other end of the arm portion; When the vascular stent system is in the assembled state, the hook (216) is located in the annular cavity (212), a portion of the connecting member (22) passes through a through hole (213) and is matched with the hook portion, and the hook portion of the hook (216) is located below the through hole (213). When the vascular stent system is in the partially released state, the arm portion of the hook (216) passes through the through hole (213) and is tensioned, the hook portion is matched and connected to the connecting piece (22), and the connection between the arm portion and the inner tube (21) is located below the through hole (213). When the vascular stent system is in the fully released state, the arm of the hook (216) passes through the through hole (213), the hook is separated from the connecting piece (22), and the connection between the arm and the inner tube (21) is located in the distal direction of the through hole (213).

9. The vascular stent system according to claim 8, characterized in that: The through holes (213) include a plurality of rows arranged at intervals along the circumference of the inner tube (21); the self-expanding stent unit (11) includes a wavy annular structure forming wave crests (112) and wave troughs (111) in the circumferential direction; each wave crest (112) and / or wave trough (111) of the self-expanding stent unit (11) is respectively provided with a connecting member (22); the push rod (215) is tubular and coaxial with the inner tube (21); and the hook (216) includes a plurality of rows arranged at intervals along the circumference of the push rod (215).

10. The vascular stent system according to claim 3, 7 or 9, characterized in that: The number of wave crests (112) and wave troughs (111) of each of the self-expanding stent units (11) is equal.

11. The vascular stent system according to claim 1, 5 or 8, characterized in that: The first release mechanism (25) comprises a rack (251) and a gear assembly which are arranged on the operating handle (24) and are connected to each other in a matching manner; the distal end of the rack (251) is fixedly connected to the outer sheath tube (23); the operating handle (24) is fixedly connected to the proximal end of the inner tube (21); the gear assembly is rotatably arranged on the operating handle (24); and when the gear assembly is in operation, it can drive the rack (251) to move along its axial direction.

12. The vascular stent system according to claim 1, 5 or 8, characterized in that: The diameters of the different stent units in the expanded state are equal or different.

13. The vascular stent system according to claim 1, 5 or 8, characterized in that: A guide portion is provided at the distal end of the inner tube (21), and the guide portion always extends out of the distal end of the outer sheath tube (23).

14. The vascular stent system according to claim 1, 5 or 8, characterized in that: Each of the self-expanding stent units (11) is provided with a development mark; And / or, the material of each of the self-expanding stent units (11) is nickel-titanium alloy.

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