A braided stent delivery system

Abstract

The present invention discloses a braided stent delivery system, which belongs to the field of medical device technology. The braided stent delivery system includes a delivery handle assembly and a delivery tube assembly, the delivery handle assembly includes a rotating handle, a first slider and a second slider, the rotating handle is provided with a first threaded hole and a second threaded hole with opposite rotation directions, the first slider is threadedly connected in the first threaded hole, the second slider is threadedly connected in the second threaded hole, and both form a lead screw nut pair, the delivery tube assembly includes an inner tube, a middle tube and an outer tube which are sequentially sleeved from the inside to the outside, the braided stent is arranged between the middle tube and the outer tube, one end of the outer tube is connected to the first slider, and one end of the middle tube is connected to the second slider. The braided stent delivery system can not only realize the gradual release of the braided stent, improve the uniformity of the release of the braided stent, but also can recycle the braided stent into the delivery tube assembly when there is a problem with the release of the braided stent, so as to release it again after adjustment.

Description

Technical Field

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

[0002] With the changes in the environment and people's eating habits, more and more people are suffering from vascular diseases, such as myocardial ischemia or angina pectoris. Vascular stenosis or occlusion is an important cause of vascular diseases. Branch stenting is an effective treatment for severe vascular stenosis or even occlusion.

[0003] Braided stents are an important classification of vascular stents. Braided stents can be delivered into blood vessels and expanded inside the blood vessels to support the narrowed and occluded segments in the blood vessels, so that the blood flow in the lumen remains unobstructed and blood vessel blockage is avoided. Braided stents need to be delivered by a delivery system to enter the blood vessels and be released at the diseased part of the blood vessels. When the existing delivery systems release the braided stents, it is easy for the braided stents to be stretched or accumulated in the blood vessels due to uneven release. When the braided stents are stretched or accumulated, it will seriously affect the braided stent's support effect on the blood vessels, resulting in poor postoperative recovery for the patients. Summary of the invention

[0004] The purpose of the present invention is to provide a braided stent delivery system, which can not only realize the gradual release of the braided stent and improve the uniformity of the braided stent release process, but also can recover the braided stent when problems occur in the stent release.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A braided stent delivery system, comprising:

[0007] A conveying handle assembly, the conveying handle assembly comprising a rotating handle, a first slider and a second slider, the rotating handle being provided with a first threaded hole and a second threaded hole which are interconnected and rotate in opposite directions along the axial direction, the first slider being threadedly connected in the first threaded hole, the second slider being threadedly connected in the second threaded hole, and both forming a screw nut pair;

[0008] A delivery tube assembly, the delivery tube assembly comprising an inner tube, a middle tube and an outer tube which are sequentially sleeved from the inside to the outside, the braided stent is arranged between the middle tube and the outer tube, one end of the outer tube is connected to the first slider, and one end of the middle tube is connected to the second slider;

[0009] The rotating handle is configured such that when it rotates, the first slider and the second slider move toward each other, the outer tube moves toward the proximal end of the delivery handle assembly, and the middle tube moves toward the distal end of the delivery handle assembly to gradually release the braided stent.

[0010] Preferably, the rotating handle includes a rotating rod portion, which includes a first rotating rod and a second rotating rod that are detachably connected, the first rotating rod is provided with the first threaded hole along the axial direction, and the second rotating rod is provided with the second threaded hole along the axial direction.

[0011] Preferably, the rotating handle further comprises a grip portion, the grip portion is provided with a receiving cavity, and one end of the first rotating rod is rotatably connected in the receiving cavity.

[0012] Preferably, a through hole is provided at the bottom of the accommodating cavity, and the conveying pipe assembly is disposed through the through hole.

[0013] Preferably, at least one of the disassembly end of the first rotating rod and the disassembly end of the second rotating rod is provided with a positioning structure.

[0014] Preferably, the delivery handle assembly further comprises:

[0015] A limiting rod is arranged in the first threaded hole and the second threaded hole, and the first sliding block and the second sliding block are sleeved on the limiting rod.

[0016] Preferably, the ratio of the pitch of the first threaded hole to the pitch of the second threaded hole is 1:1-1:10.

[0017] Preferably, at least one friction structure abutting against the braided stent is provided on the outer wall of the middle tube;

[0018] The friction structure is configured to drive the braided stent to be gradually released when the middle tube moves toward the distal end of the delivery handle assembly, and is configured to drive the braided stent to be gradually retracted when the middle tube moves toward the proximal end of the delivery handle assembly.

[0019] Preferably, there is a preset friction force between the inner tube and the middle tube, and the inner tube is configured to move synchronously with the middle tube.

[0020] Preferably, the braided stent delivery system further comprises:

[0021] The limiting mechanism is configured to stop moving after the inner tube moves a preset distance along with the middle tube.

[0022] Beneficial effects of the present invention:

[0023] The present invention provides a braided stent delivery system, which includes a delivery handle assembly and a delivery tube assembly, wherein the delivery handle assembly includes a rotating handle, a first slider and a second slider, and the delivery tube assembly includes an inner tube, a middle tube and an outer tube which are sequentially sleeved from the inside to the outside. By rotating the rotating handle, the first slider and the second slider can move toward each other, thereby driving the outer tube to move toward the proximal end of the delivery handle assembly and the middle tube to move toward the distal end of the delivery handle assembly, so as to realize the gradual release of the braided stent and improve the uniformity of the release of the braided stent. When the braided stent is stretched or accumulated during the release process, the braided stent can be recovered into the delivery tube assembly by rotating the rotating handle in the opposite direction so as to be released again after adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an axonometric view of the delivery handle assembly provided by the present invention in an assembled state;

[0025] Figure 2 is a cross-sectional view of the delivery handle assembly provided by the present invention in an assembled state;

[0026] Figure 3 is an axonometric view of the delivery handle assembly provided by the present invention in a disassembled state;

[0027] Figure 4 is a cross-sectional view of the delivery handle assembly provided by the present invention in a disassembled state;

[0028] Figure 5 is an initial state diagram of the delivery pipe assembly provided by the present invention;

[0029] Figure 6 is a first intermediate state diagram of the delivery pipe assembly provided by the present invention;

[0030] Figure 7 This is a second intermediate state diagram of the delivery pipe assembly provided by the present invention.

[0031] In the figure:

[0032] 1. Rotating handle; 11. Rotating rod; 111. First rotating rod; 112. Second rotating rod; 12. Handle; 121. Through hole; 13. Cover cap; 14. Second connecting part; 141. Positioning block; 15. First connecting part; 151. Positioning groove; 16. First threaded hole; 17. Second threaded hole; 18. Docking block;

[0033] 2. First slider; 3. Second slider; 4. Limit rod; 5. Mounting seat; 51. Support hole;

[0034] 6. Inner tube; 7. Middle tube; 8. Outer tube; 9. Tip end. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0036] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] This embodiment provides a braided stent delivery system, which can deliver a braided stent to a narrow section or occluded section of a patient's blood vessel to support the patient's blood vessel, keep the blood flow in the blood vessel lumen unobstructed, and avoid blood vessel blockage. The braided stent delivery system includes a delivery handle assembly and a delivery tube assembly, the delivery tube assembly is used to carry the braided stent and serve as an execution component for releasing the braided stent, and the delivery handle assembly is used to deliver the delivery tube assembly to a target position in the blood vessel and provide power for the delivery tube assembly to release the braided stent.

[0039] like Figures 1 to 4As shown, the conveying handle assembly includes a rotating handle 1, a first slider 2 and a second slider 3. The rotating handle 1 is provided with a first threaded hole 16 and a second threaded hole 17 which are interconnected and rotate in opposite directions along the axial direction. The first slider 2 is threadedly connected in the first threaded hole 16, and the first slider 2 and the first threaded hole 16 form a screw nut pair. The second slider 3 is threadedly connected in the second threaded hole 17, and the second slider 3 and the second threaded hole 17 form a screw nut pair. When the rotating handle 1 is rotated, the first threaded hole 16 and the second threaded hole 17 inside the rotating handle 1 rotate accordingly, thereby driving the first slider 2 and the second slider 3 to move toward each other. When the rotating handle 1 is rotated in the reverse direction, the first threaded hole 16 and the second threaded hole 17 inside the rotating handle 1 rotate in the reverse direction, thereby driving the first slider 2 and the second slider 3 to move in the opposite directions.

[0040] like Figures 5 to 7 As shown, the delivery tube assembly includes an inner tube 6, a middle tube 7 and an outer tube 8 which are sequentially sleeved from the inside to the outside. One end of the outer tube 8 is placed inside the rotating handle 1 and connected to the first slider 2, and the other end of the outer tube 8 is placed outside the rotating handle 1. One end of the middle tube 7 is also placed inside the rotating handle 1 and connected to the second slider 3, and the other end of the middle tube 7 is placed outside the rotating handle 1. The lumen of the inner tube 6 forms a space allowing the guide wire to pass through. The braided stent to be delivered is arranged between the other end of the middle tube 7 and the other end of the outer tube 8.

[0041] In this embodiment, by rotating the rotary handle 1, the first slider 2 and the second slider 3 can move toward each other, thereby driving the outer tube 8 to move toward the proximal end of the delivery handle assembly, and the middle tube 7 to move toward the distal end of the delivery handle assembly, so as to realize the gradual release of the braided stent and improve the uniformity of the release of the braided stent. In addition, when the braided stent is stretched or piled up during the release process, the rotary handle 1 is rotated in the reverse direction to immediately make the first slider 2 and the second slider 3 move in reverse directions, thereby driving the outer tube 8 to move toward the distal end of the delivery handle assembly, and the middle tube 7 to move toward the proximal end of the delivery handle assembly, so as to recycle the braided stent into the delivery tube assembly so as to be released again after adjustment.

[0042] In addition, the braided stent delivery system forms a threaded hole that penetrates the rotating handle by providing a threaded structure on the entire inner wall of the rotating handle. Placing the slider in the threaded hole can achieve a wide range of movement of the slider, which is beneficial to increasing the types of braided stents that can be released by the braided stent delivery system and improving the versatility of the braided stent delivery system.

[0043] In order to further ensure that the braided stent can be gradually released as the outer tube 8 and the middle tube 7 move toward each other, a friction structure is provided on the middle tube 7, and the friction structure abuts against the braided stent, and there is a certain friction force between the two. Under the action of the friction force, the friction structure can drive the braided stent to be gradually released when the middle tube 7 moves toward the distal end of the delivery handle assembly. In addition, the setting of the friction structure can also ensure that the braided stent is driven to be gradually recovered when the middle tube 7 moves toward the proximal end of the delivery handle assembly.

[0044] In this embodiment, in order to ensure that there is sufficient friction between the friction structure and the braided support, a ring tube sleeved on the middle tube 7 is selected as the friction structure. The ring tube can increase the contact area between the friction structure and the braided support, and increase the friction between the friction structure and the braided support. Of course, in other embodiments, the friction structure can also be a plurality of friction points arranged along the circumference of the middle tube 7, and each friction point can be embedded in the mesh of the braided support, thereby driving the braided support to be gradually released or gradually recovered. Optionally, the friction structure can be a tubular structure or a point structure made of plastic or rubber.

[0045] Furthermore, when the length of the braided stent is long, in order to avoid the friction structure being unable to effectively drive each section on the braided stent, thereby causing the braided stent to be unable to be completely released or completely recovered, in the present embodiment, a plurality of friction structures are arranged at intervals along the axial direction of the middle tube 7. The plurality of friction structures divide the braided stent into a plurality of small sections, and each small section is driven by a friction structure. When recovering or releasing, the plurality of friction structures drive the braided stent at the same time, which greatly improves the release and recovery effect of the braided stent, and can further prevent the braided stent from being overstretched or accumulated. In the present embodiment, two friction structures are arranged, wherein one friction structure is arranged at the distal end of the middle tube 7, and the other friction structure is arranged in the middle position of the middle tube 7.

[0046] like Figures 1 to 4 As shown, the rotating handle 1 includes a rotating rod 11, a handle 12 and a cap 13. The handle 12 has a cylindrical appearance, and a receiving cavity is provided on one end surface of the handle 12 along the axial direction. The rotating rod 11 is cylindrical as a whole, and one end of the rotating rod 11 is placed in the receiving cavity, and can rotate in the receiving cavity under the action of an external force. The other end cover of the rotating rod 11 is provided with a cap 13, and the cap 13 and the handle 12 are both provided with a through hole 121 for allowing the conveying tube assembly to pass through. Optionally, a miniature bearing is provided between the rotating rod 11 and the receiving cavity to reduce the friction during the rotation of the rotating rod 11.

[0047] like Figures 5 to 7As shown, the end of the inner tube 6 placed outside the rotating handle 1 is connected to the tip end 9, and the tip end 9 is a conical structure. The provision of the tip end 9 helps to reduce the resistance encountered by the delivery tube assembly during movement in the blood vessel, thereby improving the delivery efficiency and surgical effect.

[0048] Optionally, the rotating rod portion 11 includes a first rotating rod 111 and a second rotating rod 112 that are detachably connected, and the first threaded hole 16 is disposed in the first rotating rod 111 and penetrates the first rotating rod 111 along the axial direction of the first rotating rod 111. The second threaded hole 17 is disposed in the second rotating rod 112 and penetrates the second rotating rod 112 along the axial direction of the second rotating rod 112. By configuring the rotating rod portion 11 to be detachably connected, the first rotating rod 111 and the second rotating rod 112 can be quickly disassembled after the braided stent is released, so as to realize the rapid recovery of the tip end 9, which is beneficial to reducing the operation time and improving the operation efficiency, thereby facilitating the improvement of the patient's postoperative recovery effect.

[0049] Alternatively, if Figures 1 to 4 As shown, a first connection portion 15 is provided at the disassembly end of the first rotating rod 111, and a second connection portion 14 is provided at the disassembly end of the second rotating rod 112. The first rotating rod 111 and the second rotating rod 112 can be fixedly connected by connecting the first connection portion 15 and the second connection portion 14, and the first rotating rod 111 and the second rotating rod 112 can be disassembled by separating the first connection portion 15 and the second connection portion 14. The specific detachable connection method of the first connection portion 15 and the second connection portion 14 can be a connection piece connection, a clamping connection, or a magnetic connection, etc., which is not specifically limited here.

[0050] Optionally, a positioning structure is provided on the first connecting portion 15 and the second connecting portion 14 to achieve precise connection between the first connecting portion 15 and the second connecting portion 14. Specifically, a positioning groove 151 is provided on the first connecting portion 15, and a positioning block 141 is provided on the second connecting portion 14, and the positioning block 141 can be inserted into the positioning groove 151. By inserting the positioning hole into the positioning groove 151, not only can the fixed connection of the first rotating rod 111 and the second rotating rod 112 be achieved, but also the relative position between the first rotating rod 111 and the second rotating rod 112 can be kept fixed. Of course, in other embodiments, the positioning groove 151 can also be provided on the second connecting portion 14, and the positioning block 141 can be provided on the first connecting portion 15.

[0051] Further optionally, the number of the positioning grooves 151 and the positioning blocks 141 can be set to multiple to improve the positioning effect. In this embodiment, the number of the positioning grooves 151 and the positioning blocks 141 are both two, the two positioning grooves 151 are symmetrically arranged on the first connecting portion 15, and the two positioning blocks 141 are symmetrically arranged on the second connecting portion 14. Preferably, the positioning block 141 is an arc-shaped sheet mechanism, and the positioning groove 151 is an arc-shaped groove to increase the contact area and further improve the positioning effect.

[0052] In order to improve the accuracy of the first slider 2 and the second slider 3 during the movement process and prevent the first slider 2 and the second slider 3 from rotating, as shown in FIG. Figures 2 to 4 As shown, the delivery handle assembly further includes a limiting rod 4, which is disposed in the first threaded hole 16 and the second threaded hole 17. The first slider 2 and the second slider 3 are both provided with through holes, and the limiting rod 4 is disposed through the through holes.

[0053] In order to support the limit rod 4, as Figure 3 As shown, a mounting seat 5 is provided at the connection between the first rotating rod 111 and the second rotating rod 112. In this embodiment, the mounting seat 5 is disc-shaped, and the arc surface of the mounting seat 5 abuts against the inner wall surface of the first rotating rod 111 or the inner wall surface of the second rotating rod 112. The mounting seat 5 is provided with a support hole 51 that allows the limit rod 4 to pass through. Optionally, the shape of the support hole 51 is the same as the cross-sectional shape of the limit rod 4 to improve the supporting effect. In this embodiment, the shape of the support hole 51 is fan-shaped. In order to improve the supporting effect, the number of the limit rods 4 can be multiple according to demand. In this embodiment, the number of the limit rods 4 is two, and the number of the support holes 51 matches the number of the limit rods 4.

[0054] The first rotating rod 111 and the second rotating rod 112 can be both integrally manufactured or assembled as split structures. In the present embodiment, in order to facilitate the installation of the first slider 2 and the second slider 3, the first rotating rod 111 and the second rotating rod 112 are both split structures. Taking the first rotating rod 111 as an example, the first rotating rod 111 is formed by splicing two semi-cylindrical half rods. Specifically, a docking block 18 is provided on the plane of one of the half rods, and a docking groove is provided on the plane of the other half rod, and the splicing of the two half rods is achieved by clamping the docking block 18 in the docking groove.

[0055] In this embodiment, the outer diameter of the inner tube 6 is the same as the inner diameter of the middle tube 7. The inner tube 6 is a PI tube, and the end of the middle tube 7 close to the rotating handle 1 is a PEEK tube, and the end away from the rotating handle 1 is a PI tube. By setting the outer diameter of the inner tube 6 and the inner diameter of the middle tube 7 to be the same, the inner tube 6 is abutted against the middle tube 7 sleeved thereon, and by selecting the materials of the inner tube 6 and the middle tube 7, there is sufficient friction between the inner tube 6 and the middle tube 7. When the middle tube 7 moves, the inner tube 6 can move with the middle tube 7 driven by the friction. By making the inner tube 6 move synchronously with the middle tube 7, the tip end 9 can be made to move synchronously with the inner tube 6, so as to achieve the purpose of using the tip end 9 to reduce the resistance of the conveying tube assembly during the state change process.

[0056] Optionally, the braided stent delivery system further includes a limiting mechanism, which is configured to stop moving after the inner tube 6 moves a preset distance along with the middle tube 7. Specifically, the limiting mechanism can be a limiting block connected to the inner tube 6, which abuts against the structure inside the rotating handle 1 through the limiting block to achieve the purpose of limiting the inner tube 6 from continuing to move. Here, the structure inside the rotating handle 1 can be a limiting groove. The limiting mechanism is used to stop the inner tube 6 from moving after a certain distance, which can prevent the excessive movement of the tip end 9 from causing damage to the patient's normal blood vessels.

[0057] Further, in order to make the middle tube 7 and the outer tube 8 of the braided stent delivery system have different moving speeds, the pitches of the first threaded hole 16 and the second threaded hole 17 can be set to be different. Optionally, the pitch ratio of the first threaded hole 16 and the second threaded hole 17 can be set to 1:1-1:10 according to the needs, such as 1:1, 1:2, 2:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9 or 1:10, etc. Of course, in addition to these ratios, it can also be any ratio between 1:1-1:10, which will not be listed here. Of course, in other embodiments, the first threaded hole 16 and the second threaded hole 17 can also be set as variable pitch threaded holes, so that the first slider 2 and the second slider 3 have multiple sliding speeds in one release process, so that the outer tube 8 and the middle tube 7 have multiple moving speeds in one release process, thereby enabling the braided stent to achieve variable speed release. For example, the braided stent is released in a regular pattern of fast in the front section, slow in the middle section, and fast in the back section. The slow release in the middle section is beneficial to improving the uniformity of the braided stent release process and avoiding the accumulation or excessive stretching of the braided stent during the release process.

[0058] like Figures 5 to 7 As shown, the process of releasing the braided stent by the delivery tube assembly is as follows:

[0059] First, if Figure 5The figure shows the initial state of the conveying tube assembly, at this time, the end of the inner tube 6 placed outside the rotating handle 1 is flush with the end of the outer tube 8 placed outside the rotating handle 1, and there is a certain accommodating space between the end of the middle tube 7 placed outside the rotating handle 1 and the end of the outer tube 8 placed outside the rotating handle 1, and the conveying bracket is placed in the accommodating space.

[0060] Then, the rotating handle 1 is rotated forward, and the first slider 2 and the second slider 3 move toward each other from the two ends of the rotating handle 1. The outer tube 8 moves toward the proximal end of the delivery handle assembly driven by the first slider 2, and the middle tube 7 moves toward the distal end of the delivery handle assembly driven by the second slider 3. At this time, since there is sufficient friction between the middle tube 7 and the inner tube 6, the inner tube 6 moves synchronously with the middle tube 7 toward the distal end of the delivery handle assembly. The state of the delivery tube assembly is determined by Figure 5 The displayed status switches to Figure 6 Status shown.

[0061] Finally, the rotating handle 1 is rotated forwardly, and the middle tube 7 continues to move toward the distal end of the delivery handle assembly under the drive of the second slider 3, and the outer tube 8 continues to move toward the proximal end of the delivery handle assembly under the drive of the first slider 2. When the middle tube 7 gradually protrudes out of the outer tube 8, the braided stent is gradually released, and the state of the delivery tube assembly changes from Figure 6 The displayed status switches to Figure 7 In this process, since the limiting mechanism restricts the inner tube 6 from continuing to move with the middle tube 7, the inner tube 6 stops moving.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A braided stent delivery system, characterized in that: include: A conveying handle assembly, the conveying handle assembly comprising a rotating handle (1), a first slider (2) and a second slider (3), the rotating handle (1) being provided with a first threaded hole (16) and a second threaded hole (17) which are interconnected and rotate in opposite directions along the axial direction, the first slider (2) being threadedly connected in the first threaded hole (16), the second slider (3) being threadedly connected in the second threaded hole (17), and both forming a screw nut pair; A delivery tube assembly, the delivery tube assembly comprising an inner tube (6), a middle tube (7) and an outer tube (8) which are sequentially sleeved from the inside to the outside, the braided stent being arranged between the middle tube (7) and the outer tube (8), one end of the outer tube (8) being connected to the first slider (2), and one end of the middle tube (7) being connected to the second slider (3); The rotating handle (1) is configured such that when it rotates, the first slider (2) and the second slider (3) move toward each other, the outer tube (8) moves toward the proximal end of the delivery handle assembly, and the middle tube (7) moves toward the distal end of the delivery handle assembly, so as to gradually release the braided stent; The rotating handle (1) comprises a rotating rod portion (11), the rotating rod portion (11) comprising a first rotating rod (111) and a second rotating rod (112) which are detachably connected, the first rotating rod (111) being provided with the first threaded hole (16) along the axial direction, and the second rotating rod (112) being provided with the second threaded hole (17) along the axial direction; The rotating handle (1) further comprises a handle portion (12), the handle portion (12) being provided with a receiving cavity, and one end of the first rotating rod (111) being rotatably connected in the receiving cavity; A through hole (121) is provided at the bottom of the accommodating cavity, and the delivery pipe assembly is arranged through the through hole (121); At least one friction structure abutting against the braided support is provided on the outer wall of the middle tube (7); The friction structure is configured to drive the braided stent to be gradually released when the middle tube (7) moves toward the distal end of the delivery handle assembly, and is configured to drive the braided stent to be gradually retracted when the middle tube (7) moves toward the proximal end of the delivery handle assembly.

2. The braided stent delivery system according to claim 1, characterized in that: At least one of the disassembly end of the first rotating rod (111) and the disassembly end of the second rotating rod (112) is provided with a positioning structure.

3. The braided stent delivery system according to claim 1, characterized in that: The delivery handle assembly also includes: A limiting rod (4), wherein the limiting rod (4) is arranged in the first threaded hole (16) and the second threaded hole (17), and the first sliding block (2) and the second sliding block (3) are sleeved on the limiting rod (4).

4. The braided stent delivery system according to claim 1, characterized in that: The ratio of the pitch of the first threaded hole (16) to the pitch of the second threaded hole (17) is 1:1-1:

10.

5. The braided stent delivery system according to claim 1, characterized in that: There is a preset friction force between the inner tube (6) and the middle tube (7), and the inner tube (6) is configured to be able to move synchronously with the middle tube (7).

6. The braided stent delivery system according to claim 5, characterized in that: Also includes: A limiting mechanism, wherein the limiting mechanism is configured to stop moving after the inner tube (6) moves a preset distance along with the middle tube (7).

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