Vascular stent delivery system

Abstract

The present invention provides a vascular stent delivery system, a vascular stent and a recovery mechanism connected to the vascular stent; the recovery mechanism includes multiple introduction wires, a locking nail, a locking wire, a middle tube, a small sealing handle, a locking button and a rivet, multiple introduction wires are inserted and connected to the vascular stent, the head ends of multiple introduction wires are in a free state, the tail ends of multiple introduction wires are limited to the locking nail, the locking nail is detachably fixed to the front end of the middle tube, the small sealing handle is sleeved on the tail end of the middle tube, a locking wire through hole is formed on the middle tube, the proximal end of the locking wire is inserted into the locking nail, the distal end of the locking wire passes through the locking wire through hole and is riveted to the locking button through the rivet, and the locking button is clamped to the small sealing handle. The vascular stent of the present invention can accurately adjust the position, has a simple structure, and is easy to operate.

Description

Technical Field

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

[0002] Aortic disease, especially aortic aneurysm, is a serious threat to the life of patients and has a high mortality rate. In recent years, with the development of minimally invasive interventional treatment technology, intraluminal vascular stent isolation has been widely used to treat aortic disease, that is, using a vascular stent delivery system to deliver a vascular stent to the lesion site, through which the blood flow in the dissection or aneurysm cavity disappears, forming a thrombus, which then gradually absorbs or isolates the lesion to achieve the purpose of treating aortic disease.

[0003] In conventional vascular stent systems, doctors determine the axial position of the vascular stent system in the aorta according to the imaging mark at the proximal end of the stent coating, and then release the stent. However, when releasing the stent, the stent release position may deviate due to improper blood pressure control, imaging error or operation reasons. On the one hand, the stent cannot well block the rupture of the dissecting aneurysm, resulting in failure of intraluminal isolation. On the other hand, the vascular stent may partially or completely cover the outlet of the branch vessel, resulting in ischemia of the branch vessel.

[0004] When releasing the pre-fenestrated stent, the doctor uses the developed mark at the stent window to align the window with the branch vessel opening to ensure smooth blood flow in the branch vessels while blocking the rupture of the aortic dissection. However, since the stent is in a compressed state in the sheath of the delivery system during positioning of the stent window, it is difficult to accurately position the stent window with the branch vessel opening. Only after partially pushing out the stent and unfolding the stent window section can it be determined whether the stent window is aligned with the branch vessel opening. Therefore, the unfolded portion of the conventional stent is already supported in the blood vessel at this time, and the position of the stent can no longer be adjusted to align the two. The stent recovery effect is poor, the position adjustment is inaccurate, and the operation is cumbersome. Summary of the invention

[0005] In view of the above deficiencies in the prior art, the present invention proposes a vascular stent delivery system to solve the above technical problems.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a vascular stent delivery system, comprising: a vascular stent and a recovery mechanism connected to the vascular stent;

[0008] The retrieval mechanism includes multiple introduction wires, locking nails, locking wires, a middle tube, a small sealing handle, a locking button and a rivet. Multiple introduction wires are inserted and connected to the vascular stent, the head ends of multiple introduction wires are in a free state, the tail ends of multiple introduction wires are limited to the locking nails, the locking nails are detachably fixed to the front end of the middle tube, the small sealing handle is sleeved on the tail end of the middle tube, a locking wire through hole is formed through the middle tube, the proximal end of the locking wire is inserted into the locking nail, the distal end of the locking wire passes through the locking wire through hole and is riveted to the locking button through the rivet, and the locking button is clamped to the small sealing handle.

[0009] Preferably, the introduction wire is a medical stainless steel wire or a nickel-titanium memory alloy wire, and its diameter is 0.1 to 0.3 mm.

[0010] Preferably, the locking wire is a medical stainless steel wire or a nickel-titanium memory alloy wire, and the diameter of the locking wire is 0.3-0.5 mm.

[0011] Preferably, the locking nail includes a locking nail body, an end disk, a middle disk and an external thread which are sleeved on the locking nail body. A central hole is formed in the locking nail body. The end disk has a plurality of lead-in wire holes evenly distributed along its circumferential direction. The lead-in wire is arranged to pass through the lead-in wire holes. The end disk and the middle disk are respectively provided with locking wire holes passing through them. The proximal end of the locking wire passes through the locking wire hole and is connected to the locking nail body. The external thread is fixedly connected to the front end of the middle tube.

[0012] Preferably, the external thread is screwed and fixed to the front end of the middle tube.

[0013] Preferably, the diameter of the wire locking through hole is the same as the diameter of the wire locking hole and is larger than the diameter of the locking wire, and the locking wire can move smoothly in the wire locking hole and the wire locking through hole.

[0014] Preferably, the lock button includes a limiting column, a rivet hole passing through the limiting column, a boss arranged in the middle position of the limiting column, and a flat shoulder arranged perpendicular to the boss; the rivet is interference fit with the rivet hole to fix the distal end of the locking wire in the rivet hole; the boss and the flat shoulder are matched with the small sealing handle.

[0015] Preferably, a limiting groove is formed by a depression on one side of the small sealing handle, a limiting hole is arranged in the limiting groove, and the locking button is matched with the limiting hole.

[0016] Preferably, the width of the flat shoulder is matched with the upper opening clearance of the limiting groove, the diameter of the limiting column is matched with the diameter clearance of the limiting hole, the width of the boss is matched with the lower groove width clearance of the limiting groove, and the thickness of the boss is interference matched with the lower groove height of the limiting groove.

[0017] Preferably, the locking wire hole, the locking wire through-hole, the rivet and the locking button are respectively the same in number as the multiple lead-in wires, and the tail ends of the multiple lead-in wires pass through the locking wire hole and the locking wire through-hole to the rivet hole in sequence. The rivet squeezes and fixes the tail end of the lead-in wire in the rivet hole and is fixedly connected to the locking button.

[0018] Compared with the related art, in the embodiment of the present invention, multiple introduction wires are inserted and connected to the vascular stent, the head ends of the multiple introduction wires are in a free state, the tail ends of the multiple introduction wires are limited to the locking nail, the locking nail is detachably fixed to the front end of the middle tube, the small sealing handle is sleeved on the tail end of the middle tube, the middle tube is penetrated to form a locking wire through hole, the proximal end of the locking wire is inserted into the locking nail, the distal end of the locking wire passes through the locking wire through hole and is riveted to the locking button by the rivet, and the locking button is clamped to the small sealing handle. In this way, after releasing the front end vascular stent, if it is found that the position of the vascular stent is inaccurate, the vascular stent can be retracted into the sheath tube, and the position of the recovery mechanism can be readjusted to release the vascular stent again, and the operation is repeated until the position of the vascular stent is accurate and the stent is released as a whole, thereby achieving accurate positioning of the vascular stent in the blood vessel and improving the treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings. The above and other aspects of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings.

[0020] In the figure:

[0021] Figure 1a It is a schematic diagram of the structure of a vascular stent delivery system in an embodiment of the present invention;

[0022] Figure 1b for Figure 1a A local enlarged view of I;

[0023] Figure 1c for Figure 1a Partial enlarged view of II;

[0024] Figure 2 It is a structural schematic diagram of the rear release mechanism in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the middle tube in an embodiment of the present invention;

[0026] Figure 4 It is a structural schematic diagram of a lock button in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of a locking pin in an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of a sealed small handle in an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of a vascular stent in an embodiment of the present invention;

[0030] Figure 8a is a cross-sectional view of a blood vessel stent in a released state according to an embodiment of the present invention;

[0031] Figure 8b It is a structural schematic diagram of a vascular stent in a released state according to an embodiment of the present invention;

[0032] Figure 8c This is a schematic diagram of the lock button position structure in the released state of the vascular stent according to an embodiment of the present invention;

[0033] Figure 9a is a cross-sectional view of a vascular stent in a compressed state according to an embodiment of the present invention;

[0034] Figure 9b This is a schematic diagram of the lock button position structure in a compressed state of the vascular stent according to an embodiment of the present invention;

[0035] Fig.10a is a cross-sectional view of a vascular stent in a semi-released state according to an embodiment of the present invention;

[0036] Fig.10b It is a schematic diagram of the structure of the vascular stent in a semi-released state in an embodiment of the present invention;

[0037] Fig.11 This is a schematic diagram of the structure of a vascular stent in an optional embodiment of the present invention;

[0038] Fig.12 for Fig.11 A partial enlarged view of VIII;

[0039] Fig.13 This is a schematic diagram of the three-dimensional structure of the small handle in an embodiment of the present invention;

[0040] Fig.14 This is a schematic diagram of the structure of a sealed small handle in an embodiment of the present invention;

[0041] Fig.15a This is a schematic diagram of the lock button position structure in a compressed state of the vascular stent according to an embodiment of the present invention;

[0042] Fig.15b Schematic diagram of the lock button position structure when the vascular stent is in the released state according to an embodiment of the present invention.

[0043] Among them, 1. Positioning guide head, 2. Screw, 3. Connector, 4. Sheath, 5. Introduction wire, 6. Double-layer core tube, 7. Locking nail, 71. Locking nail body, 72. End disc, 73. Middle disc, 74. External thread, 8. Locking wire, 9. Middle tube, 10. Large handle, 11. Sealed small handle, 12. Locking button, 13. Rivet, 14. Small handle, 15. Steel needle, 16. Thick spring tube, 17. Thin spring tube, 18. Introduction wire hole, 19. Locking wire hole, 20. Middle hole, 21. Boss, 22. Flat shoulder, 23. Rivet hole, 24. Bare frame, 25. Stent ring, 251. First section stent ring, 252. Second section stent ring, 253. Third section stent ring, 26. Artificial blood vessel, 27. Surgical suture, 28. Wave crest, 29. Wave trough, 30. Limiting groove, 31. Limiting hole, 32. Limiting column, 33. Locking wire through hole, 34. Core tube through hole, 35. Nut, 36. Pre-opening window, 37. Development mark, 38. Pushing nut, 39. Internal thread, 40. Vascular stent, 50. Post-release mechanism, 51. Post-release body, 60. Recovery mechanism, 70. Pushing mechanism. DETAILED DESCRIPTION

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0045] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] See also Figure 1a-10bAs shown, a vascular stent delivery system provided by an embodiment of the present invention includes: a vascular stent 40 and a recovery mechanism 60 connected to the vascular stent 40 .

[0048] The recovery mechanism 60 includes multiple introduction wires 5, locking nails 7, locking wires 8, a middle tube 9, a small sealing handle 11, a locking button 12 and a rivet 13. Multiple introduction wires 5 are inserted and connected to the vascular stent 40, and the head ends of multiple introduction wires 5 are in a free state. The tail ends of multiple introduction wires 5 are limited to the locking nails 7. The locking nails 7 are detachably fixed to the front end of the middle tube 9. The small sealing handle 11 is sleeved on the tail end of the middle tube 9. A locking wire through hole 33 is formed through the middle tube 9. The proximal end of the locking wire 8 is inserted into the locking nail 7. The distal end of the locking wire 8 passes through the locking wire through hole 33 and is riveted to the locking button 12 through the rivet 13. The locking button 12 is clamped to the small sealing handle 11.

[0049] The proximal end of the locking wire 8 is the proximal end, and the distal end is the distal end.

[0050] Specifically, the tail ends of the multiple introduction wires 5 are inserted and connected to the vascular stent 40, so that the head ends of the multiple introduction wires 5 are in a free state, and the tail ends of the multiple introduction wires 5 are limited to the locking nail 7, so that a limited fixation is formed between the introduction wires 5 and the locking nail 7, thereby avoiding entanglement between the multiple introduction wires 5, and the introduction wires 5 are convenient for telescopic adjustment of the vascular stent 40.

[0051] By rotating the locking button 12, the locking button 12 is separated from the sealing small handle 11, and the locking button 12 pulls the tail end of the locking wire 8 to drive the locking nail 7 to move. Since the tail ends of the multiple introduction wires 5 are limited to the locking nail 7, during the movement of the locking nail 7, the introduction wire 5 also moves, thereby being able to contract the vascular stent 40.

[0052] The locking pin 7 is detachably fixed to the front end of the middle tube 9, which is convenient for disassembly, assembly and fixing of the locking pin 7, and is convenient for replacement and maintenance. Optionally, the locking pin 7 is clamped and fixed to the front end of the middle tube 9.

[0053] Preferably, the locking pin 7 is welded and fixed to the front end of the middle tube 9. The locking pin 7 and the middle tube 9 are integrally formed, and the structural strength is high.

[0054] The vascular stent delivery system also includes a positioning guide head 1, a rear release mechanism 50, a double-layer core tube 6, a sheath tube 4, a large handle 10, a small handle 14, and a pushing mechanism 70. One end of the rear release mechanism 50 is fixedly connected to the positioning guide head 1, and the other end of the rear release mechanism 50 is fixedly connected to one end of the double-layer core tube 6. The other end of the double-layer core tube 6 is fixed in one end of the middle tube 9. The sheath tube 4 is sleeved on the middle tube 9. The large handle 10 is fixed to the sheath tube 4. The small handle 14 is sleeved on the sheath tube 4 and fixedly connected to the other end of the middle tube 9. The sealed small handle 11 is sealed on the small handle 14, and the pushing mechanism 70 is connected to the small handle 14. Among them, the positioning guide head 1 is arranged corresponding to one end of the sheath tube 4, and the small handle 14 is sleeved on the other end of the sheath tube 4.

[0055] The vascular stent 40 includes a bare frame 24 at the head end and a multi-section stent ring 25 at the tail end, wherein the head end of the bare frame 24 corresponds to the other end of the rear release mechanism 50, and the tail end of the bare frame 24 is respectively connected with the head end of the multi-section stent ring 25 through multiple introduction wires 5, and the tail end of the multiple introduction wires 5 is connected with the locking nail 7 in a limited manner. The bare frame 24 and the multi-section stent ring 25 are connected through multiple introduction wires 5, the head ends of the multiple introduction wires 5 are in a free state, and the tail ends of the multiple introduction wires 5 are connected to the locking nail 7.

[0056] Specifically, the large handle 10 is used to drive the sheath 4 to move backward, open the bare frame 24, and release the stent ring 25 at the front end, so that the front end of the stent ring 25 is opened to achieve the effect of stretching the blood vessel. If the position of the vascular stent 40 is found to be inaccurate, the lock button 12 is loosened, the distal end of the lock wire 8 is pulled, and the proximal end of the lock wire 8 is connected to the lock nail 7, thereby pulling the lock nail 7 and the middle tube 9 to move toward one end of the distal sheath 4, and the small handle 14 is used to pull the rear release mechanism 50 to retract the vascular stent 40 into the sheath 4, and the position is readjusted and the first three stent rings 25 are released again. The operation is repeated until the position of the vascular stent 40 is accurate and the vascular stent 40 is released as a whole, thereby achieving accurate positioning of the vascular stent 40 in the blood vessel and improving the treatment effect.

[0057] In this embodiment, if Figure 7As shown, the multiple sections of the stent ring 25 include a first section stent ring 251, a second section stent ring 252 and a third section stent ring 253, one end of the first section stent ring 251 corresponds to the bare frame 24, wherein the bare frame 24 is sequentially connected with the first section stent ring 251, the second section stent ring 252 and the third section stent ring 253 by inserting multiple introduction wires 5. The bare frame 24, the stent ring 25 and the covering film are sutured together by surgical sutures 27 to form a vascular stent 40, the head ends of the multiple introduction wires 5 are arranged corresponding to the other end of the rear release mechanism 50, and the tail ends of the multiple introduction wires 5 are connected to the locking nail 7. Through the connection of the introduction wire 5, it is convenient to adjust the stent ring 25 to position the vascular stent 40 in the blood vessel, with high positioning accuracy and good adjustment effect.

[0058] Preferably, each of the support rings 25 is provided with N wave crests 28 and N wave troughs 29, wherein N is 3-8.

[0059] Specifically, the vascular stent 40 is made by sewing a bare frame 24 and M (M≥3) stent rings 25 on an artificial blood vessel 26 with surgical sutures 27. One end of the bare frame 24 is the stent head end, and the other end is the stent tail end. From the stent head end to the tail end, there are the bare frame 24, the first stent ring 251, the second stent ring 252 to the Mth stent ring. Each stent ring 25 has N (N=3~8) peaks 28 and N troughs 29, which are called N-head stent rings 25. The artificial blood vessel 26 is L2 in length. Both ends of the artificial blood vessel 26 and around the pre-opened window 36 of the pre-opened vascular stent 40 are sewn with developing marks 37 to display the position of the vascular stent 40 during surgery.

[0060] In this embodiment, if Figure 8a-Figure 10b As shown, when it is necessary to recover the front K (K≤M) stent rings 25 and bare frame 24 of the vascular stent 40 into the sheath tube 4 during the operation, it is necessary to pull the N lead-in wire ends, one by one from the vascular stent 40 ( Figure 7 ) is inserted into the sheath tube 4, and the artificial blood vessel 26 is passed out from the right side of the trough 29 of the K-th stent ring 1 to 3 mm, crossing the trough part of the stent ring 25, and then the artificial blood vessel 26 is passed from the left side of the trough 29 1 to 3 mm; the same operation is performed on the K-1st, K-2nd, ..., 1st stent ring, and bare frame 24. In this way, the bare frame 24 of the N-head vascular stent 40 and the N troughs of the first K-th stent ring are respectively pressed by the N introduction wires 5. The head ends of the N introduction wires 5 are in a free state, and the tail ends of the N introduction wires 5 are connected and fixed with the locking nails 7 through the N introduction wire holes 5.

[0061] In this embodiment, if Figure 1a-Figure 1cAs shown, the locking wire 8 is a medical stainless steel wire or a nickel-titanium memory alloy wire, and the diameter of the locking wire 8 is 0.3-0.5 mm. Medical stainless steel wire or nickel-titanium memory alloy wire has high medical safety, and the diameter of the locking wire 8 is 0.3-0.5 mm. The proximal end of the locking wire 8 is conveniently inserted into the locking nail 7, and the distal end of the locking wire 8 passes through the middle tube 9 to the locking button 12, and the distal end of the locking wire is squeezed by the rivet 13 to be fixed to the locking button 12.

[0062] In this embodiment, if Figure 5 As shown, the locking nail 7 includes a locking nail body 71, an end disc 72, a middle disc 73 and an external thread 74 which are sleeved on the locking nail body 71. The locking nail body 71 is formed with a central hole 20. The end disc 72 is evenly distributed with a plurality of lead-in wire holes 18 which are the same in number as the bracket ring 25 along its circumferential direction. The lead-in wire 5 is arranged through the lead-in wire holes 18. The end disc 72 and the middle disc 73 are respectively provided with locking wire holes 19 which pass through them. The locking wire 8 passes through the locking wire holes 19 and is connected to the locking nail body 71. The locking nail body 71 is fixed to the other end of the double-layer core tube 6, and the external thread 74 is fixedly connected to one end of the middle tube 9.

[0063] Specifically, the locking nail 7 is made of medical stainless steel. The tail end of the double-layer core tube 6 is arranged in the middle hole 20, the introduction wire 5 is arranged through the introduction wire hole 18, the end disc 72 and the middle disc 73 are penetrated with a locking wire hole 19, the locking wire 8 passes through the locking wire hole 19 and is connected to the locking nail body 71, so that the locking button 12 can adjust the locking wire 8, thereby driving the vascular stent 40 to move back and forth in the sheath tube 4 to adjust the position of the vascular stent 40.

[0064] In this embodiment, if Figure 8a As shown, the introduction wire 5 is a medical stainless steel wire or a nickel-titanium memory alloy wire, and its diameter is 0.1-0.3 mm. The length of the introduction wire 5 is L1, and the number of the introduction wires 5 matches the corresponding number of the stent rings 25. There are N introduction wires 5, and N is 3-8, that is, there are 3-8 introduction wires 5 and they correspond to the stent rings 25.

[0065] In this embodiment, if Figure 4 As shown, the locking button 12 is made of medical stainless steel, and includes a limiting column 32, a rivet hole 23 penetrating the limiting column 32, a boss 21 arranged at the middle position of the limiting column 32, and a flat shoulder 22 arranged perpendicular to the boss 21. The rivet 13 is interference fit with the rivet hole 23 to fix the distal end of the locking wire 8 in the rivet hole 23, and the boss 21 and the flat shoulder 22 are matched with the sealing small handle 11.

[0066] Specifically, the locking button 12 is made of medical stainless steel. The upper part of the locking button 12 is a knob, which can be turned by hand to rotate the locking button 12; the middle part of the locking button 12 is designed with a convex shoulder 21 and a flat shoulder 22, which are vertically distributed, the flat shoulder 22 has a width of A, and the convex shoulder 21 has a width of B; the lower part of the locking button 12 is a limiting column 32, which is provided with a rivet hole 23, and the diameter of the limiting column 32 is D.

[0067] In this embodiment, if Figure 1a-Figure 1c As shown, the material of the sealed small handle 11 includes one of POM, PVC, PP and ABS.

[0068] In this embodiment, if Figure 8c As shown, a limiting groove 30 is formed on one side of the sealing small handle 11 , a limiting hole 31 is arranged in the limiting groove 30 , and the locking button 12 is matched with the limiting hole 31 .

[0069] In this embodiment, if Figure 4 , Figure 6-Figure 8c As shown, the width of the flat shoulder 22 is clearance matched with the upper opening of the limiting groove 30, the diameter of the limiting column 32 is clearance matched with the diameter of the limiting hole 31, the width of the boss 21 is clearance matched with the lower groove width of the limiting groove 30, and the thickness of the boss 21 is interference matched with the lower groove height of the limiting groove 30.

[0070] Specifically, the sealing small handle 11 has a limit groove 30 and a limit hole 31. The upper opening width of the limit groove 30 is A1, and the lower groove width is B1; the inner diameter of the limit hole 31 is D1, B1>A1>D1. The width A of the flat shoulder 22 and the upper opening A1 of the limit groove 30 are clearance matched, and the diameter D of the limit column 32 and the diameter D1 of the limit hole 31 are clearance matched; the width B of the lock button boss 21 and the lower groove width B1 of the limit groove 30 are clearance matched, and the thickness of the boss 21 and the groove height of the lower part of the limit groove 30 are interference matched.

[0071] By aligning the flat shoulder 22 on the lock button 12 with the upper opening of the limit groove 30, inserting the limit column 32 into the upper limit hole 31 of the sealing small handle 11, and rotating it 90 degrees, the boss 21 is screwed into and clamped in the groove at the bottom of the limit groove 30. At this time, the lock button 12 is in a locked state; rotate the lock button 12 90 degrees again, the lock button 12 is in an unlocked state, and the lock button 12 can be lifted from the limit hole 31.

[0072] In this embodiment, if Figure 3-Figure 5 As shown, a core tube through hole 34 is provided at the axial position of the middle tube 9, an internal thread 39 is provided at one end of the core tube through hole 34 close to the double-layer core tube 6, the internal thread 39 is connected to the external thread 74, and a locking wire through hole 33 is provided in the circumferential direction of the middle tube 9.

[0073] In this embodiment, if Figure 3 As shown, the diameter of the locking wire through hole 33 is the same as the diameter of the locking wire hole 19 and is larger than the diameter of the locking wire 8 , and the locking wire 8 can move smoothly in the locking wire hole 19 and the locking wire through hole 33 .

[0074] Specifically, a core tube through hole 34 is provided at the axial position of the middle tube 9, and an internal thread 39 is provided at the proximal end of the core tube through hole 34; a locking wire through hole 33 is provided in the circumferential direction of the middle tube 9, and the diameter of the locking wire through hole 33 is equal to the diameter of the locking wire hole 19 and slightly larger than the diameter of the locking wire 8, and the center distance between the locking wire through hole 33 and the core tube through hole 34 is H1, H=H1; the locking wire hole 19 is coaxial with the locking wire through hole 33, and the locking wire 8 can be easily pumped in the locking wire hole 19 and the locking wire through hole 33.

[0075] In this embodiment, if Figure 3-Figure 7 As shown, the delivery system of the vascular stent 40 has N (N=3-8) lead-in wires 5 fixedly connected to the locking nail 7 through N lead-in wire holes 18 on the locking nail 7. The length L1 of the lead-in wire 5 and the length L2 of the artificial blood vessel 26 should satisfy the following relationship: 0mm≤L1-L2≤10mm.

[0076] The external thread 74 of the locking pin 7 is screwed together with the internal thread 39 of the middle tube 9 to be connected and fixed to the middle tube 9 . The locking thread hole 19 on the locking pin 7 is coaxial with the locking thread through hole 33 on the middle tube 9 .

[0077] The lock wire 8 passes through the lock wire hole 19 and the lock wire through hole 33 to reach the other end of the middle tube 9, and the lock wire 8 is squeezed and fixed in the rivet hole 23 by the rivet 13, and is connected and fixed with the lock button 12. The lock wire 8 can slide easily in the lock wire hole 19 and the lock wire through hole 33.

[0078] In this embodiment, if Figure 2 As shown, the rear release mechanism 50 includes a rear release body 51, a screw 2 disposed on the rear release body 51, a connector 3, a plurality of steel needles 15, a thick spring tube 16 and a thin spring tube 17, wherein the steel needles 15 are fixed together with the screw 2 and are evenly distributed along the circumferential direction of the screw 2, one end of the rear release body 51 is connected to the positioning guide head 1 through the screw 2, the other end of the rear release body 51 is connected to the thick spring tube 16 through the connector 3, and the screw 2 is connected to the thin spring tube 17. Preferably, the connector 3 is a polygonal connector, such as a five-pointed star connector.

[0079] Specifically, the rear release mechanism 50 is composed of a screw 2, a connector 3, and N steel needles 15. The steel needles 15 are fixed to the screw 2 and are evenly distributed along the circumferential direction of the screw 2. The front end of the rear release mechanism 50 is connected to the positioning guide head 1 through the thread on the screw 2. The rear end of the rear release mechanism 50 is connected to the thick spring tube 16 through the connector 3, and is connected to the thin spring tube 17 through the screw 2. The connector 3 has N pin holes evenly distributed along the circumferential direction, and the thin spring tube 17 can drive the screw 2 and the N steel needles 15 to move back and forth in the N pin holes. There is an annular groove in the middle of the connector 3, so that the N wave peaks 28 of the bare frame 24 on the vascular stent 40 can be embedded therein, and the N steel needles 15 inserted into the pin holes are constrained in the groove to achieve locking of the bare frame 24. Among them, N is 3-8.

[0080] In this embodiment, if Figure 1a-Figure 1c As shown, the inside of the large handle 10 is a long hole that runs through the front and back, and the middle tube 9 passes through the long hole and is connected to the sealing small handle 11. The front end of the large handle 10 is connected and fixed to the rear end of the sheath tube 4, and there is a sealing ring at the rear end of the large handle 10. By tightening the nut 35, the sealing ring is squeezed, thereby pressing the middle tube 9, which plays the role of locking the middle tube 9.

[0081] In this embodiment, the pushing mechanism 70 includes a screw connected to the small handle 14 and a pushing nut 38 sleeved on the screw. The pushing nut 38 is rotated to adjust the position of the small handle 14, thereby adjusting the movement of the blood vessel stent 40 in the sheath tube 4.

[0082] In this embodiment, the vascular stent and the delivery system are assembled as follows:

[0083] First, all the introduction wires 5 are connected to the vascular stent 40; then the tail of the vascular stent 40 is locked with the locking nail 7: to ensure that the N introduction wires 5 are not twisted and entangled, the trough on the last stent ring 25 of the vascular stent 40, which is located in the same circumferential direction as the locking wire hole 19, is pressed into the groove between the end disk 72 and the middle disk 73 of the locking nail 7, and the locking wire 8 is inserted into the two locking wire holes 19, so that the trough 29 is fixed in the groove of the locking nail 7, and the tail of the vascular stent 40 is locked with the locking nail 7. The locking button 12 is locked on the small sealing handle 11 to prevent the locking wire 8 from unexpectedly moving so that the trough of the last stent ring is disengaged from the locking nail groove, and to prevent the stent tail from being unexpectedly unlocked from the locking nail.

[0084] All the wave peaks 28 of the bare frame 24 on the vascular stent 40 are fixed to the rear release mechanism 50, so that the head end of the vascular stent 40 is locked with the delivery system.

[0085] The vascular stent 40 is compressed section by section starting from the last stent ring 25 and inserted into the sheath tube 4 until the entire vascular stent 40 is inserted into the sheath tube 4. The nut 35 is tightened to fix the middle tube 9 and the sheath tube 4 together. The assembly of the vascular stent 40 and the delivery system is now completed.

[0086] like Figure 8a-Figure 10b As shown, the working principle of the present invention is as follows:

[0087] 1. Before the operation, assemble the vascular stent 40 and the delivery system together (such as Figure 8a-8c ): Connect multiple introduction wires 5 to the third stent ring 253, the second stent ring 252, the first stent ring 251, and the bare frame 24 of the vascular stent 40 in sequence; connect one end of the multiple introduction wires 5 to the other end of the rear release mechanism 50, and the other end of the multiple introduction wires 5 to the locking nail 7; lock the rear end of the vascular stent 40 on the locking nail 7, and lock the locking button 12 on the sealing small handle 11; lock the bare frame 24 on the rear release mechanism 50; compress the vascular stent 40 step by step from the rear end and push it into the sheath 4.

[0088] 2. Insert the super-hard guide wire into the thoracic aorta through the femoral artery incision to the appropriate position.

[0089] 3. Push the delivery system with the vascular stent 40 installed along the guide wire to the aortic arch, and adjust the position of the delivery system by using the four developing marks 37 around the pre-opened window on the vascular stent 40 so that the window of the vascular stent 40 is aligned with the opening of the left subclavian artery.

[0090] 4. Loosen the nut 35, fix the small handle 14 (at this time, the bare frame 24 of the stent head is fixed to the rear release mechanism 50, and the tail end is fixed to the locking pin 7), withdraw the large handle 10 to drive the sheath 4 to move backward until the first three stent rings are completely out of the sheath 4 and supported in the blood vessel ( Fig.10a ). At this time, the pre-opened window 36 is fully expanded, and it can be accurately determined whether it is aligned with the opening of the left subclavian artery. When the two are not aligned, because the first three sections of the stent ring 25 are already supported in the blood vessel, their position cannot be directly adjusted. It is necessary to fix the small handle 14 and push the large handle 10 forward so that the first three sections of the stent ring 25 and the bare frame 24 are compressed again and pulled back into the sheath 4 under the guidance of multiple introduction wires 5. At this time, the delivery system can be easily pumped and rotated to adjust the position of the stent pre-opened window 36 in the blood vessel. Withdraw the sheath 4 again to release the first three sections of the stent. If the pre-opened window 36 is still not aligned with the opening of the left subclavian artery, repeat the above operation until the two are aligned to achieve accurate positioning of the vascular stent 40. Release the remaining part of the stent in the sheath 4.

[0091] 5. Unlock the locking button 12 from the sealing small handle 11 and withdraw the locking wire 8, so that the rear end of the vascular stent 40 is unlocked and disengaged from the locking pin 7.

[0092] 6. Hold the small handle 14 and rotate the push nut 38 counterclockwise to open the rear release mechanism 50 and release the bare frame 24. At this point, the vascular stent 40 is fully deployed.

[0093] 7. Hold the large handle 10 still, withdraw the small handle 14, separate the introduction wire 5 from the vascular stent 40, and move the middle tube 9, locking nail 7, introduction wire 5, double-layer core tube 6, rear release mechanism 3, and positioning guide head 1 into the sheath tube 4 together with the small handle 14.

[0094] 8. After the positioning guide head 1 is engaged with the sheath tube 4, tighten the nut 35.

[0095] 9. Hold the large handle 10 and withdraw along the introduction wire 5 to remove the entire delivery system from the blood vessel. The operation is now complete.

[0096] In an optional embodiment of the present invention, Figure 11-15b The number of the locking wire hole 19, the locking wire through hole 33, the rivet 13 and the locking button 12 is the same as that of the plurality of the lead-in wires 5. The tail ends of the plurality of the lead-in wires 5 sequentially pass through the locking wire hole 19, the locking wire through hole 33 to the rivet hole 23. The rivet squeezes and fixes the tail ends of the lead-in wires 5 in the rivet hole 23 and is fixedly connected to the locking button 12. In this embodiment, the lead-in wires include 3-8.

[0097] Preferably, the plurality of lead-in wires 5 include five lead-in wires, which are respectively inserted into the troughs 29 of the bare frame 24 and the support ring 25. The end disc 72 has five lead-in wire holes 18 uniformly distributed along its circumferential direction, the same number as the support ring 25. The five lead-in wires 5 are arranged through the five lead-in wire holes 18. The end disc 72 and the middle disc 73 are respectively provided with five locking wire holes 19 passing through them. The middle tube is provided with five locking wire through holes 33, and the locking button 12 and the rivet 13 are each provided with five. The tail ends of the five lead-in wires 5 pass through the lead-in wire hole 18, the locking wire hole 19, and the locking wire through hole 33 in turn, and are squeezed into the rivet hole 23 by the rivet 13 to achieve fixation, and are engaged with the limiting hole 31 by the locking button 12. Since five limiting grooves 30 are formed by depression on one side of the sealing small handle 11, five limiting holes 31 are respectively arranged in the five limiting grooves 30, five locking buttons 12 and rivets 7 are respectively arranged in the five limiting holes 31, and five locking wires 8 are respectively fixed to the five rivets 13. In this embodiment, the distal end of the locking wire 8 is fixed to the locking button 12, and optionally, the distal end of the locking wire 8 is fixed to the center position of the locking button 12.

[0098] By unlocking the first lock button 12 from the small sealing handle 11 and withdrawing the first lock wire 8, the portion of the first introduction wire 5 connected to the vascular stent 40 is retracted into the sheath 4. When the vascular stent 40 is rotated or moved to adjust the pre-opened window 36, the pre-opened window 36 is made to correspond to the blood vessel. After the position of the vascular stent 40 is accurately adjusted, the entire vascular stent 40 is pushed out of the sheath 4. At this time, the rear release mechanism 50 at the proximal end of the vascular stent 40 is not opened, and the five introduction wires are interlaced and connected with the vascular stent 40. The five introduction wires 5 limit 1 to 5 troughs 29 of the last stent ring at the distal end of the vascular stent 40 on the locking nail 7. By removing the five introduction wires 5 one by one, the introduction wire 5 is separated from the vascular stent 40, and by contracting the introduction wires 5 one by one, the friction of contraction of the vascular stent 40 is small, the vascular stent 40 will not move, and the adjustment effect of the vascular stent 40 is good. The last section of the stent ring 25 at the distal end of the vascular stent 40 is limited by the trough 29 on the locking nail 7 and detaches from the locking nail 7 one by one (at this time, the rear release mechanism 50 is still not opened), and finally the push nut 38 is rotated counterclockwise by operating the small handle 14 to open the rear release mechanism 50, and the bare frame 24 and the stent ring 25 are released in turn. At this point, the vascular stent 40 is completely opened.

[0099] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0100] The vascular stent 40 is delivered to the lesion site through the delivery system, the small handle is fixed and the large handle is withdrawn to release the bare frame 24 of the vascular stent 40 and the front K (K≤M) segments of the vascular stent 40 ring, and the front K segments of the vascular stent 40 are unfolded and supported in the blood vessel. At this time, if it is found that the position of the vascular stent 40 in the blood vessel is inaccurate, such as the inability to completely block the proximal rupture, the unexpected blocking of the branch blood vessel, and the pre-opened window 36 is not aligned with the branch blood vessel. The small handle 14 is fixed to push the large handle 10 forward. Because the tail of the vascular stent 40 is fixed on the locking nail 7, the locking nail 7 is connected to the middle tube 9 through a thread, so that the vascular stent 40 is fixed when the sheath 4 moves forward; the sheath 4 gradually compresses the vascular stent 40 and puts it into the sheath 4. When the trough 29 of the vascular stent 40 ring reaches the sheath 4 port, because the trough 29 is pressed by the introduction wire 5, the introduction wire 5 smoothly introduces the trough of the vascular stent 40 ring into the sheath without getting stuck at the sheath 4 port. In this way, the released part of the vascular stent 40 can be retracted into the sheath 4, so that the position of the vascular stent 40 in the blood vessel can be readjusted by adjusting the axial position and circumferential position of the delivery system in the blood vessel, thereby achieving precise proximal positioning of the vascular stent 40 and precise positioning of the pre-opened window 36.

[0101] By limiting the tail end of the vascular stent 40 on the locking nail 7, when plugging the distal end of the blood vessel, the delivery system is pushed so that the distal end of the vascular stent 40 is pushed to a suitable position to effectively plug the distal end; the small handle is fixed, and the large handle 10 is withdrawn until the entire vascular stent 40 is out of the sheath 4, and after unfolding, it is supported and fixed on the blood vessel wall. In this process, the distal end of the vascular stent 40 is always locked on the locking nail 7, and the position is fixed, thereby achieving accurate positioning of the distal end of the vascular stent 40.

[0102] It should be noted that the various embodiments described above with reference to the accompanying drawings are only used to illustrate the present invention rather than to limit the scope of the present invention. Those skilled in the art should understand that any modification or equivalent substitution of the present invention without departing from the spirit and scope of the present invention should be included within the scope of the present invention. In addition, unless otherwise indicated by the context, words appearing in the singular include the plural form, and vice versa. In addition, unless otherwise specified, all or part of any embodiment may be used in combination with all or part of any other embodiment.

Claims

1. A vascular stent delivery system, characterized in that: include: A vascular stent and a recovery mechanism connected to the vascular stent; The recovery mechanism comprises a plurality of introduction wires, a locking nail, a middle tube, a small sealing handle, a locking button and a rivet. The plurality of introduction wires are inserted and connected to the vascular stent, the head ends of the plurality of introduction wires are in a free state, the tail ends of the plurality of introduction wires are limited to the locking nail, the locking nail is detachably fixed to the front end of the middle tube, the small sealing handle is sleeved on the tail end of the middle tube, a locking wire through hole is formed on the middle tube, the rivet is riveted to the locking button, and the locking button is clamped to the small sealing handle; The locking nail comprises a locking nail body, an end disc, a middle disc and an external thread which are sleeved on the locking nail body. A middle hole is formed in the locking nail body. The end disc is evenly distributed with a plurality of lead-in wire holes along its circumferential direction. The lead-in wire is arranged through the lead-in wire holes. The end disc and the middle disc are respectively provided with locking wire holes which penetrate therethrough. The external thread is fixedly connected to the front end of the middle tube. The lock button includes a limiting column, a rivet hole penetrating the limiting column, a convex shoulder arranged at the middle position of the limiting column, and a flat shoulder arranged perpendicular to the convex shoulder, the rivet is interference-fitted with the rivet hole, and the convex shoulder and the flat shoulder are matched with the small sealing handle; The number of the locking wire hole, the locking wire through hole, the rivet and the locking button is respectively the same as the number of the multiple lead-in wires. The tail ends of the multiple lead-in wires pass through the locking wire hole and the locking wire through hole to the rivet hole in sequence. The rivet squeezes and fixes the tail end of the lead-in wire in the rivet hole and is fixedly connected to the locking button.

2. The vascular stent delivery system according to claim 1, characterized in that: The introduction wire is a medical stainless steel wire or a nickel-titanium memory alloy wire, and its diameter is 0.1-0.3 mm.

3. The vascular stent delivery system according to claim 1, characterized in that: The external thread is screwed and fixed to the front end of the middle tube.

4. The vascular stent delivery system according to claim 1, characterized in that: The diameter of the wire locking through hole is the same as the diameter of the wire locking hole.

5. The vascular stent delivery system according to claim 1, characterized in that: A limiting groove is formed on one side of the small sealing handle, a limiting hole is arranged in the limiting groove, and the locking button is matched with the limiting hole.

6. The vascular stent delivery system according to claim 5, characterized in that: The width of the flat shoulder is matched with the upper opening clearance of the limiting groove, the diameter of the limiting column is matched with the diameter clearance of the limiting hole, the width of the boss is matched with the lower groove width clearance of the limiting groove, and the thickness of the boss is interference matched with the lower groove height of the limiting groove.

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