Stent conveying device and stent conveying system

Abstract

The stent conveying device comprises a pushing wire, the pushing wire is sequentially provided with an assembling section, a reducing section and a main body section from the far end to the near end, the wire diameter of the main body section is larger than that of the assembling section, and the wire diameter of the end, connected with the main body section, of the reducing section is the same as that of the main body section; the wire diameter of one end, connected with the assembling section, of the reducing section is the same as that of the assembling section, and the wire diameter of the reducing section is gradually reduced from the near end to the far end; a far-end spring is arranged at the end, close to the far end, of the assembly section. The releasing and recycling pipe comprises a fixed part and a movable part, the fixed part is arranged on the assembling section, one end of the movable part is arranged on the outer surface of the fixed part, and the other end of the movable part is in a flaring shape; movable parts are arranged at the two ends of the fixed part; the first developing ring and the second developing ring are arranged on the assembling section; the first developing ring is positioned at one end of the fixing part close to the near end; the second developing ring is positioned at one end, close to the far end, of the fixing part, or the second developing ring is positioned in the fixing part. The invention also relates to a stent delivery system.

Description

Technical Field

[0001] The present invention relates to the technical field of stent delivery devices, and particularly relates to a stent delivery device and a stent delivery system. Background Art

[0002] Implanting a stent or a drug-eluting stent in a blood vessel is one of the main methods for treating vascular diseases. In the current process of implanting a stent into a blood vessel, a catheter sheath and a push controller are usually used in cooperation to clamp the stent, and the catheter sheath, the stent, and the push controller form a structure similar to a sandwich structure to generate sufficient frictional force to achieve the purpose of delivering the stent distally. The stent needs to overcome frictional force during its release and retrieval, and the push controller is subjected to force as it moves distally or proximally. If the push controller is directly sleeved on the push guide wire, the push controller will rotate or slide. When the stent enters the microcatheter, the push controller cannot complete the process of delivering the stent into the microcatheter because it is squeezed and expanded.

[0003] The current push controller has the following disadvantages:

[0004] 1. It has high requirements for the dimensional accuracy matching among the catheter sheath, the stent, and the push controller. The existing push controller is prone to cause stent detachment during stent retrieval.

[0005] 2. A push block is provided on the existing push controller, which reduces the bending performance of the push controller, increases the hardness and frictional force of the push controller, but may scratch the inner wall of the blood vessel during stent delivery, leading to the formation of thrombus.

[0006] 3. In order to increase the compliance of the push controller in the blood vessel, the distal end of the push controller is usually ground, but this will cause the external spring on the push controller to be extremely prone to eccentric phenomenon during the processing, reducing the processing qualification rate of the push controller. At the same time, the eccentric phenomenon of the push controller causes it to be unable to be normally pushed in the microcatheter.

[0007] 4. The stent is in a compressed state in the catheter sheath for a long time, and the braided wires or rod stents of the stent may be intertwined. When the stent is released, the head end of the stent may not be able to expand in time. Summary of the Invention

[0008] The present invention provides a stent delivery device and a stent delivery system to solve the technical problems of low precision, low frictional force of the existing push controller, and easy stent detachment.

[0009] The present invention discloses a stent delivery device, which includes a pusher wire, a release and retrieval tube, a first radiopaque ring and a second radiopaque ring. The pusher wire is sequentially provided with an assembly section, a diameter-changing section and a main body section from the distal end to the proximal end. The wire diameter of the main body section is greater than that of the assembly section. The wire diameter of one end of the diameter-changing section connected to the main body section is the same as that of the main body section, and the wire diameter of one end of the diameter-changing section connected to the assembly section is the same as that of the assembly section. The wire diameter of the diameter-changing section gradually decreases from the proximal end to the distal end. A distal spring is provided at one end of the assembly section close to the distal end. The release and retrieval tube includes a fixed part and a movable part. The fixed part is arranged on the assembly section, one end of the movable part is arranged on the outer surface of the fixed part, and the other end of the movable part is flared. The movable parts are provided at both ends of the fixed part. The first radiopaque ring and the second radiopaque ring are both arranged on the assembly section. The first radiopaque ring is located at one end of the fixed part close to the proximal end. The second radiopaque ring is located at one end of the fixed part close to the distal end, or the second radiopaque ring is located inside the fixed part.

[0010] Further, the stent delivery device further includes a flexible spring, and the flexible spring is sleeved on the pusher wire. One end of the flexible spring is arranged at the connection between the main body section and the diameter-changing section. The other end of the flexible spring is located at the first radiopaque ring, and the flexible spring is sleeved on the first radiopaque ring.

[0011] Further, a buffer section is also arranged at the position of the assembly section close to the distal spring.

[0012] Further, the value range of the outer diameter of the end of the movable part away from the fixed part is 1.5 mm to 7.0 mm.

[0013] Further, a plurality of incisions are arranged at the end of the movable part away from the fixed part.

[0014] Further, the length of the movable part is shorter than that of the fixed part.

[0015] Further, the stent delivery device further includes a radiopaque member, and the radiopaque member is arranged between the fixed part and the movable part.

[0016] Further, a notch for accommodating the movable part is arranged on the fixed part.

[0017] Further, a groove is arranged in the notch. The stent delivery device further includes a radiopaque member, and the radiopaque member is arranged in the groove.

[0018] Further, a plurality of groups of convex points are arranged on the inner wall of the movable part, and the plurality of groups of convex points are sequentially arranged at intervals in the direction from the distal end to the proximal end. Each group of convex points includes a plurality of convex points uniformly arranged around the axis of the movable part.

[0019] Further, a chamfer is provided on the inner wall of the movable part, and the chamfer is located at one end of the movable part away from the fixed part.

[0020] Further, when the release and recovery tube is in a compressed state, the movable part is in contact with the fixed part, and the cross-sectional shape of the contact surface between the two is a straight line or a wavy line.

[0021] Further, the release and recovery tube is made of a flexible material; the flexible material is made of any one or a mixture of silicone, TPU, PET, and Pebax.

[0022] The present invention discloses a stent delivery system, which includes the stent delivery device as described in any one of the above; the stent delivery device is slidably disposed in the lumen of the catheter sheath.

[0023] The stent delivery device and the stent delivery system provided by the present invention can achieve the following technical effects:

[0024] In the prior art, the release mark, the recovery mark, and the full release mark are integrally formed with the push guide wire, which results in fixed outer diameters of the release mark, the recovery mark, and the full release mark. High dimensional matching requirements between the push guide wire, the stent, and the catheter sheath make it easy for the stent to be unloaded due to insufficient friction.

[0025] Compared with the prior art, in this embodiment, a first radiopaque ring, a second radiopaque ring, and a release and recovery tube are provided on the assembly section, and the release and recovery tube is limited and fixed through the cooperation of the first radiopaque ring and the second radiopaque ring. When in use, the stent delivery device disclosed in this embodiment is disposed in the lumen of the catheter sheath, and the release and recovery tube made of a flexible material can adaptively cooperate with the catheter sheath to clamp the stent, reducing the requirement for precision, increasing the friction between the catheter sheath, the stent, and the stent delivery device, ensuring that the stent delivery device has sufficient supporting force to achieve the purpose of delivering the stent, and reducing the risk of stent unloading. One end of the stent delivery device near the distal end can move along the lumen.

[0026] During the process of the stent delivery device driving the stent to move distally, the movable part near the distal end on the release and recovery tube moves proximally due to friction and undergoes elastic deformation, which can increase the outer diameter of the movable part near the distal end on the release and recovery tube, increasing the friction. As the friction increases, the clamping force of the stent delivery device and the catheter sheath on the stent is further enhanced, reducing the risk of stent unloading and facilitating the release of the stent.

[0027] During the process of the stent delivery device driving the stent to move proximally, the movable part near the proximal end on the release and retrieval tube moves distally due to friction and undergoes elastic deformation, which can increase the outer diameter of the movable part near the proximal end on the release and retrieval tube, increasing the friction. As the friction increases, the clamping force of the stent delivery device and the catheter sheath on the stent is further enhanced, reducing the risk of stent dislodgment and facilitating the release of the stent.

[0028] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are regarded as similar elements, and wherein:

[0030] Figure 1 is a schematic diagram of an embodiment of a stent delivery device of the present invention;

[0031] Figure 2 is a schematic diagram of an embodiment of the release and retrieval tube of a stent delivery device of the present invention;

[0032] Figure 3 is a cross-sectional schematic diagram of an embodiment of the release and retrieval tube of a stent delivery device of the present invention;

[0033] Figure 4 is a partial cross-sectional schematic diagram of an embodiment of a stent delivery device of the present invention Figure 1 ;

[0034] Figure 5 is a partial schematic diagram of an embodiment of the pusher wire of a stent delivery device of the present invention;

[0035] Figure 6 is a background art diagram;

[0036] Figure 7 is a partial cross-sectional schematic diagram of an embodiment of a stent delivery device of the present invention Figure 2 ;

[0037] Figure 8 is a partial cross-sectional schematic diagram of an embodiment of a stent delivery device of the present invention Figure 3 ;

[0038] Figure 9 is a partial cross-sectional schematic diagram of an embodiment of the release and retrieval tube of a stent delivery device of the present invention Figure 1 ;

[0039] Figure 10It is a partial cross-sectional schematic view of an embodiment of the release and recovery tube of a stent delivery device according to the present invention. Figure 2 ;

[0040] Figure 11 It is a partial cross-sectional schematic view of an embodiment of a stent delivery device according to the present invention. Figure 4 ;

[0041] Figure 12 It is a partial schematic view of an embodiment of the fixing part of a stent delivery device according to the present invention. Figure 1 ;

[0042] Figure 13 It is a partial cross-sectional schematic view of an embodiment of a stent delivery device according to the present invention. Figure 5 ;

[0043] Figure 14 It is a partial schematic view of an embodiment of the fixing part of a stent delivery device according to the present invention. Figure 2 ;

[0044] Figure 15 It is a cross-sectional schematic view of an embodiment of a stent delivery system according to the present invention.

[0045] Reference numerals:

[0046] 1. Pushing wire; 11. Main body section; 12. Reducing section; 13. Assembly section; 14. Buffer section; 2. Release and recovery tube; 21. Fixing part; 211. Notch; 212. Groove; 22. Movable part; 221. Movable sub-part; 222. Chamfer; 23. Cut; 24. Assembly groove; 25. Space interlayer; 26. Convex point; 27. Annular groove; 31. First radiopaque ring; 32. Second radiopaque ring; 33. Distal spring; 34. Flexible spring; 35. Radiopaque member; 4. Catheter sheath; 41. Lumen; 5. Stent. Detailed implementation manners

[0047] In order to be able to understand the characteristics and technical content of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The accompanying drawings are only for reference and illustration purposes and are not used to limit the embodiments of the present invention. In the following technical description, for the convenience of explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be shown in a simplified manner to simplify the drawings.

[0048] In the description of the embodiments of the present invention, the claims, and the above-mentioned drawings, the terms "first", "second", etc. are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present invention described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0049] In the embodiments of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present invention and their implementations, and are not used to limit that the indicated devices, elements, or components must have a specific orientation or be constructed and operated in a specific orientation. And, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present invention can be understood according to specific circumstances.

[0050] In addition, the terms "arranged", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0051] Unless otherwise specified, the term "plurality" means two or more, and "multiple groups" means two or more groups.

[0052] It should be noted that, without conflict, the embodiments in the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0053] In the present invention, the distal end refers to the end far from the operator during the operation, and the proximal end refers to the end close to the operator during the operation.

[0054] First Embodiment

[0055] A stent delivery device mentioned in this embodiment, such as Figure 1As shown in the figure, the stent delivery device includes a pusher wire 1, a release and retrieval tube 2, a first radiopaque ring 31, and a second radiopaque ring 32. The pusher wire 1 includes a main body section 11, a diameter-changing section 12, and an assembly section 13. The assembly section 13, the diameter-changing section 12, and the main body section 11 are arranged in sequence from the distal end to the proximal end. The assembly section 13, the diameter-changing section 12, and the main body section 11 are integrally formed to form the pusher wire 1. The wire diameter of the main body section 11 is greater than that of the assembly section 13. The diameter-changing section 12 is located between the main body section 11 and the assembly section 13. The wire diameter of the end of the diameter-changing section 12 connected to the main body section 11 is the same as that of the main body section 11, and the wire diameter of the end of the diameter-changing section 12 connected to the assembly section 13 is the same as that of the assembly section 13. The wire diameter of the diameter-changing section 12 gradually decreases from the proximal end to the distal end. The diameter-changing section 12 can play a transitional role in the wire diameters of the main body section 11 and the assembly section 13. Such a setting can not only ensure that the stent delivery device has sufficient structural strength but also facilitate the delivery of the stent to a more distal position in the blood vessel.

[0056] As Figure 1 shown, a distal spring 33 is provided at one end of the assembly section 13 close to the distal end. The distal spring 33 is sleeved on one end of the assembly section 13 close to the distal end. One end of the distal spring 33 is fixedly connected to one end of the assembly section 13 close to the distal end, and a round head is provided at the other end of the distal spring 33 to prevent damage to the inner wall of the blood vessel during the delivery of the stent 5. The release and retrieval tube 2 is provided on the assembly section 13. The first radiopaque ring 31 and the second radiopaque ring 32 are both provided on the assembly section 13, and the release and retrieval tube 2 is fixed by the first radiopaque ring 31 and the second radiopaque ring 32.

[0057] As Figures 1 to 3 shown, the release and retrieval tube 2 includes a fixed part 21 and a movable part 22. Both the fixed part 21 and the movable part 22 are tubular. The fixed part 21 is provided on the assembly section 13, and the movable part 22 is sleeved on the fixed part 21. Specifically, one end of the movable part 22 is fixed to the outer surface of the fixed part 21, and the other end of the movable part 22 is flared, that is, the end of the movable part 22 away from the fixed part 21 is flared. The outer diameter R of the flared end of the movable part 22 ranges from 1.5 mm to 7.0 mm. The movable part 22 is provided at both ends of the fixed part 21, and these two movable parts 22 are symmetric structures. Both the fixed part 21 and the movable part 22 of the release and retrieval tube 2 can be made of a flexible material. The flexible material can be any one of silicone, TPU, PET, and Pebax. Of course, the flexible material can also be a mixture of multiple materials selected from silicone, TPU, PET, and Pebax. The wall thickness of the fixed part 21 is thicker than that of the movable part 22. Such a setting not only facilitates the fixation of the fixed part 21 but also helps the movable part 22 to undergo elastic deformation when being squeezed, increasing the friction of the release and retrieval tube 2.

[0058] Of course, as Figure 3As shown, a plurality of movable parts 22 can also be provided on the fixing part 21. A part of the plurality of movable parts 22 is arranged at one end of the fixing part 21 and is arranged at intervals in sequence along the axis of the fixing part 21. Another part of the plurality of movable parts 22 is arranged at the other end of the fixing part 21 and is arranged at intervals in sequence along the axis of the fixing part 21. Such a setting reduces the failure probability of the release and recovery tube 2. When one movable part 22 fails to open, it still does not affect the normal use of the release and recovery tube 2.

[0059] The specific setting schemes for the first developing ring 31 and the second developing ring 32 are as follows:

[0060] Optionally, as Figure 1 、 Figure 2 shown, both the first developing ring 31 and the second developing ring 32 are arranged on the assembly section 13. Both the first developing ring 31 and the second developing ring 32 can be made of any one of platinum-tungsten, platinum-iridium, and tantalum as the developing material, which is convenient for the operator to observe the position of the release and recovery tube 2 during the operation. In order to further clarify the connection relationship between the release and recovery tube 2, the first developing ring 31, and the second developing ring 32, the release and recovery tube 2 in the compressed state is introduced. When the release and recovery tube 2 is in the compressed state, the outer diameter of the first developing ring 31 is the same as the outer diameter of the movable part 22. The outer diameter of the first developing ring 31 is greater than the outer diameter of the second developing ring 32. The outer diameter of the second developing ring 32 is greater than the outer diameter of the fixing part 21 and is simultaneously smaller than the outer diameter of the movable part 22. The first developing ring 31 is located at the end of the fixing part 21 close to the proximal end, and the second developing ring 32 is located at the end of the fixing part 21 close to the distal end. The release and recovery tube 2 is fixed on the pushing wire 1 by clamping the first developing ring 31 and the second developing ring 32, which can prevent the release and recovery tube 2 from slipping off the assembly section 13.

[0061] Optionally, as Figure 2 、 Figure 4As shown in the figure, the first developing ring 31 and the second developing ring 32 are both arranged on the assembly section 13. The first developing ring 31 and the second developing ring 32 can both be made of any one of platinum-tungsten, platinum-iridium, and tantalum as the developing material, which is convenient for the operator to observe the position of the release and recovery tube 2 during the operation. In order to further clarify the connection relationship between the release and recovery tube 2, the first developing ring 31, and the second developing ring 32, the release and recovery tube 2 in a compressed state is introduced. When the release and recovery tube 2 is in a compressed state, the outer diameter of the first developing ring 31 is the same as the outer diameter of the movable part 22. The outer diameter of the first developing ring 31 is greater than the outer diameter of the second developing ring 32. The outer diameter of the second developing ring 32 is greater than the inner diameter of the fixed part 21, and the outer diameter of the second developing ring 32 is less than the outer diameter of the fixed part 21. Correspondingly, a groove for accommodating the second developing ring 32 is formed on the inner wall of the fixed part 21. When the release and recovery tube is installed on the push wire 1, the second developing ring 32 on the push wire 1 is located in the groove of the fixed part 21. The first developing ring 31 is located at one end of the fixed part 21 close to the proximal end, while the second developing ring 32 is located inside the fixed part 21 and at the middle position of the fixed part 21. The first developing ring 31 is located outside the release and recovery tube 2 and in the direction of the fixed part 21 close to the proximal end, which can increase the pushing force of the stent delivery device. The second developing ring 32 is arranged inside the fixed part 21. Through this hidden setting, the risk of parts being exposed to the outside is reduced. The fixing of the release and recovery tube 2 is also completed through the cooperation of the first developing ring 31 and the second developing ring 32.

[0062] In this embodiment, any one of the above optional technical solutions can be selected.

[0063] In the prior art, the release mark, the recovery mark, and the full release mark are all integrally formed with the push guide wire, which results in the outer diameters of the release mark, the recovery mark, and the full release mark being fixed sizes. The dimensional matching requirements between the push guide wire, the stent, and the catheter sheath are high, and it is easy for the stent to be unloaded due to insufficient friction.

[0064] Compared with the prior art, in this embodiment, the first developing ring 31, the second developing ring 32, and the release and recovery tube 2 are arranged on the assembly section 13, and the release and recovery tube 2 is limited and fixed through the cooperation of the first developing ring 31 and the second developing ring 32. When in use, the stent delivery device disclosed in this embodiment is arranged in the lumen 41 of the catheter sheath 4, and the release and recovery tube 2 made of a flexible material can adaptively cooperate with the catheter sheath 4 to clamp the stent 5, reducing the requirement for precision, increasing the friction between the catheter sheath 4, the stent 5, and the stent delivery device, ensuring that the stent delivery device has sufficient supporting force to achieve the purpose of delivering the stent 5, and reducing the risk of the stent 5 being unloaded. One end of the stent delivery device close to the distal end can move along the lumen 41.

[0065] During the process of the stent delivery device driving the stent 5 to move distally, the movable part 22 near the distal end on the release and retrieval tube 2 moves proximally due to friction and undergoes elastic deformation, which can increase the outer diameter of the movable part 22 near the distal end on the release and retrieval tube 2, increasing the friction. As the friction increases, the clamping force of the stent delivery device and the catheter sheath 4 on the stent 5 is further enhanced, reducing the risk of stent 5 dislodgment, facilitating the release of the stent 5, and preventing the fish mouth effect from occurring at the proximal end of the stent due to extrusion.

[0066] During the process of the stent delivery device driving the stent 5 to move proximally, the movable part 22 near the proximal end on the release and retrieval tube 2 moves distally due to friction and undergoes elastic deformation, which can increase the outer diameter of the movable part 22 near the proximal end on the release and retrieval tube 2, increasing the friction. As the friction increases, the clamping force of the stent delivery device and the catheter sheath 4 on the stent 5 is further enhanced, reducing the risk of stent 5 dislodgment, and preventing the fish mouth effect from occurring at the proximal end of the stent due to extrusion.

[0067] Second Embodiment

[0068] This embodiment also proposes a stent delivery device. The second embodiment is a further improvement based on the first embodiment. The main improvement lies in that the stent delivery device further includes a flexible spring 34, and the flexible spring 34 is arranged on the push wire 1, specifically as follows:

[0069] Optionally, as Figure 1 shown, the flexible spring 34 is sleeved on the push wire 1, and the flexible spring 34 covers the variable diameter section 12, a part of the assembly section 13 near the variable diameter section 12, and the first imaging ring 31. One end of the flexible spring 34 is located at the connection between the main body section 11 and the variable diameter section 12, and one end of the flexible spring 34 is fixedly connected to the connection between the main body section 11 and the variable diameter section 12. At the same time, the flexible spring 34 is sleeved on the first imaging ring 31, and the other end of the flexible spring 34 is located at the first imaging ring 31, and the other end of the flexible spring 34 is fixedly connected to the first imaging ring 31. By sleeving the flexible spring 34 on the push wire 1 and also sleeving the flexible spring 34 on the first imaging ring 31, while strengthening the structural strength of the assembly section 13, the compliance of the distal end of the push wire 1 can be ensured. At the same time, the phenomenon of eccentricity of the flexible spring 34 is avoided, and the coaxiality of the flexible spring 34 and the push wire 1 is improved.

[0070] Third Embodiment

[0071] This embodiment also proposes a stent delivery device. The third embodiment is a further improvement based on the first or second embodiment, specifically as follows:

[0072] Optionally, as Figure 5As shown in the figure, a buffer section 14 is further provided on the assembly section 13. The buffer section 14 is located at a position on the assembly section 13 close to the distal spring 33. The wire diameter of the buffer section 14 is the same as that of the assembly section 13, or the wire diameter of the buffer section 14 is smaller than that of the assembly section 13. Such a setting makes the stent delivery device have a certain flexibility. Preferably, the buffer section 14 is wavy. In the stent delivery device of this embodiment, it is in a compressed state in the lumen 41 of the catheter sheath 4 and is in a straight line. When the stent delivery device of this embodiment is pushed out from the lumen 41 of the catheter sheath 4, it loses the restraint of the catheter sheath 4 and returns to its original wavy shape. When the fish mouth effect occurs at the end of the stent close to the distal end, the restored wavy buffer section 14 can effectively relieve the fish mouth effect, facilitating the release of the stent and its attachment to the blood vessel wall. During the process of the stent delivery device delivering the stent 5, when the stent 5 starts to be released, the buffer section 14 starts to be compressed, making the head end of the stent 5 easier to be released. At the same time, when the distal spring 33 abuts against the inner wall of the blood vessel, the buffer section 14 can provide a buffer for a certain displacement.

[0073] Fourth Embodiment

[0074] The applicant also found that in the prior art, since the diameter of the end of the pusher wire close to the distal end is relatively thin, it is very easy to cause the fish mouth effect when passing through tortuous blood vessels or releasing the stent 5. As Figure 6 shown is the state of the stent under the fish mouth effect (the fish mouth effect is a well-known technical term in the art).

[0075] This embodiment also proposes a stent delivery device. The fourth embodiment is a further improvement based on any one of the first to third embodiments. A plurality of incisions 23 are provided at the end of the movable part 22 away from the fixed part 21. The specific solution for providing a plurality of incisions 23 on the movable part 22 is as follows:

[0076] Optionally, as Figure 2 shown, a set of incisions 23 is provided at the end of the movable part 22 away from the fixed part 21. The set of incisions 23 includes two incisions 23, and the two incisions 23 are respectively located on both sides of the axis of the movable part 22. In this way, the set of incisions 23 can make one end of the movable part 22 form two movable sub-parts 221.

[0077] Optionally, as Figure 2 shown, a set of incisions 23 is provided at the end of the movable part 22 away from the fixed part 21. The set of incisions 23 includes a plurality of incisions 23, and the plurality of incisions 23 are evenly arranged around the axis of the movable part 22. In this way, the set of incisions 23 can make one end of the movable part 22 form a plurality of movable sub-parts 221.

[0078] Optionally, multiple sets of incisions 23 are provided at one end of the movable part 22 away from the fixed part 21. The multiple sets of incisions 23 are arranged at intervals from top to bottom along a direction perpendicular to the axis of the movable part 22. Each set of incisions 23 includes two incisions 23, and the two incisions 23 are respectively located on both sides of the axis of the movable part 22. In this way, the multiple sets of incisions 23 can cause multiple movable sub-parts 221 to be formed at one end of the movable part 22.

[0079] In this embodiment, any one of the above optional technical solutions can be selected.

[0080] Compared with the prior art, in this embodiment, multiple movable sub-parts 221 are provided on the movable part 22. When the elastic force of one of the movable sub-parts 221 fails or a failure occurs, the remaining movable sub-parts 221 can still expand into a flared shape as usual. When the stent delivery device disclosed in this embodiment passes through tortuous blood vessels, the multiple movable sub-parts 221 of the movable part 22 all play a supporting role, which can prevent the stent 5 from bending or coming loose. Of course, during the release process of the stent 5, if the conical part formed at the catheter orifice of the catheter sheath 4 where the stent 5 is located is not opened, the multiple movable sub-parts 221 can effectively expand this part and can also reduce the risk of the fish mouth effect occurring when the stent 5 is released.

[0081] Fifth Embodiment

[0082] This embodiment also proposes a stent delivery device. The fifth embodiment is a further improvement based on the fourth embodiment. The main improvements are as follows:

[0083] Optionally, as Figure 4 shown, when the release and recovery tube 2 is in a compressed state, the inner wall of the movable part 22 fits against the outer surface of the fixed part 21. At this time, the length of the movable part 22 is shorter than the length of the fixed part 21. This can increase the supporting force at the end of the movable part 22 away from the fixed part 21.

[0084] Optionally, as Figure 7 shown, a chamfer 222 is provided on the inner wall of the movable part 22. The chamfer 222 is located at the end of the movable part 22 away from the fixed part 21. Such a setting is for the end of the movable part 22 away from the fixed part 21 to expand better and facilitate the support of the stent 5.

[0085] Optionally, as Figure 8 shown, the thickness of the end of the movable part 22 connected to the fixed part 21 is thicker than the thickness of the end of the movable part 22 away from the fixed part 21, and the thickness of the movable part 22 gradually decreases from the end of the movable part 22 connected to the fixed part 21 to the end of the movable part 22 away from the fixed part 21. This can improve the supporting force at the end of the movable part 22 away from the fixed part 21.

[0086] Optionally, as Figure 1 、Figure 9 , Figure 10 As shown in Figure 10 , the stent delivery device further includes a developer 35, which can be a developer spring or a developer ring made of any one of platinum-tungsten, platinum-iridium, and tantalum developer materials. The developer 35 is disposed between the fixed part 21 and the movable part 22. Specifically, an assembly groove 24 is provided on the outer surface of the fixed part 21. Correspondingly, an assembly groove 24 is also provided on the inner wall of the movable part 22. The developer 35 is first disposed in the assembly groove 24 of the fixed part 21, and at the same time, the fixed part 21 is bound to the push wire 1. Then, the movable part 22 is sleeved on the fixed part 21, and the inner wall of one end of the movable part 22 contacts and is fixed to the outer surface of the fixed part 21, so that the developer 35 is also in the assembly groove 24 of the movable part 22, playing a limiting and fixing role on the movable part 22. At the same time, it is also convenient for the operator to observe the position of the developer 35 during the operation.

[0087] In this embodiment, any one of the above optional technical solutions can be selected. Of course, the above optional technical solutions can also be combined with each other.

[0088] Sixth Embodiment

[0089] This embodiment also provides a stent delivery device. The sixth embodiment is a further improvement based on the fifth embodiment, and the main improvement lies in the cross-sectional shape of the fitting surface between the movable part 22 and the fixed part 21. Specifically:

[0090] Optionally, as Figure 4 shown, the movable part 22 and the fixed part 21 are integrally formed to form a release and recovery tube 2. When the release and recovery tube 2 is in a compressed state, the end of the movable part 22 far from the fixed part 21 fits with the fixed part 21, that is, the inner wall of the movable part 22 fits with the outer surface of the fixed part 21. When the movable part 22 fits with the fixed part 21, the cross-sectional shape of the fitting surface between the movable part 22 and the fixed part 21 is a straight line.

[0091] Optionally, as Figure 11 shown, the movable part 22 and the fixed part 21 are integrally formed to form a release and recovery tube 2. When the release and recovery tube 2 is in a compressed state, the end of the movable part 22 far from the fixed part 21 fits with the fixed part 21, that is, the inner wall of the movable part 22 fits with the outer surface of the fixed part 21. When the movable part 22 fits with the fixed part 21, the cross-sectional shape of the fitting surface between the movable part 22 and the fixed part 21 is a wavy line. This can improve the supporting force of the end of the movable part 22 far from the fixed part 21.

[0092] Any one of the above two optional technical solutions can be selected.

[0093] Seventh Embodiment

[0094] This embodiment also proposes a stent delivery device. The seventh embodiment is a further improvement based on the fourth embodiment, and the main improvement lies in:

[0095] Optionally, as Figure 12 , Figure 13 shown, the movable part 22 and the fixed part 21 are integrally formed to form the release and recovery tube 2. A notch 211 is provided on the fixed part 21, and the notch 211 is used to accommodate the movable part 22. When the release and recovery tube 2 is in a compressed state, a space sandwich 25 is formed between the end of the movable part 22 away from the fixed part 21 and the notch 211 of the fixed part 21. Such a setting improves the supporting force of the movable part 22, and it is more convenient for the movable sub-part 221 of the movable part 22 to expand and support the stent 5.

[0096] Optionally, as Figure 12 , Figure 13 shown, on the basis of the above optional technical solution, a further improvement is made. The stent delivery device further includes a developer 35, and the developer 35 can be a developer spring or a developer ring made of any one of platinum tungsten, platinum iridium, and tantalum as the developer material. Specifically, a groove 212 is provided on the fixed part 21, and the groove 212 is located within the notch 211 of the fixed part 21. The developer 35 is disposed within the groove 212. This can not only bind the fixed part 21 to the push wire 1, but also facilitate the operator to observe the position of the developer 35 during the operation. Of course, this optional technical solution can also be combined with the optional technical solution in which the second developer ring 32 is disposed within the fixed part 21 in the first embodiment. In this way, the second developer ring 32 disposed within the fixed part 21 plays a supporting role for the fixed part 21, while the developer 35 within the grooves 212 at both ends of the fixed part 21 plays a binding role. The developer 35 can play a role similar to tying a string when making sausage, and can make the release and recovery tube 2 more stably fixed to the assembly section 13 of the push wire 1.

[0097] Optionally, as Figure 2 , Figure 12 , Figure 13As shown, on the basis of the above optional technical solution, further improvements are made. Multiple groups of bumps 26 are provided on the inner wall of the movable part 22. In order to clearly explain the technical solution of providing multiple groups of bumps 26 on the movable part 22, the description is made when the release and recovery tube 2 is in a compressed state. The multiple movable sub-parts 221 of the movable part 22 enclose a tubular shape. The tubular movable part 22 is coaxially arranged with the fixed part 21. The bumps 26 are hemispherical. The multiple groups of bumps 26 are arranged at intervals in the direction from the distal end to the proximal end. Each group of bumps 26 includes multiple bumps 26 evenly arranged around the axis of the movable part 22. For example, two movable sub-parts 221 are provided at one end of the movable part 22. Three groups of bumps 26 are provided on the movable part 22. Each group of bumps 26 includes four bumps 26. These three groups of bumps 26 are arranged at intervals in the direction from the distal end to the proximal end. And half of the bumps 26 of these three groups of bumps 26 are located on the inner wall of one movable sub-part 221, and the other half of the bumps 26 of these three groups of bumps 26 are located on the inner wall of the other movable sub-part 221. When the release and recovery tube 2 is in a compressed state, the movable part 22 is tubular in the compressed state. In each group of bumps 26, the four bumps 26 are evenly arranged around the axis of the movable part 22. Such a setting can improve the elasticity of the movable sub-part 221, thereby improving the supporting force at the end of the movable part 22 away from the fixed part 21.

[0098] Optionally, as Figure 12 , Figure 14 As shown, on the basis of the above optional technical solution, further improvements are made. Multiple annular grooves 27 are provided on the outer surface of the fixed part 21. The multiple annular grooves 27 are perpendicular to the axis of the fixed part 21, or the multiple annular grooves 27 are inclined to the axis of the fixed part 21. The multiple annular grooves 27 are evenly arranged around the axis of the fixed part 21. Such a setting can increase the passing performance of the release and recovery tube 2 and facilitate the bending of the release and recovery tube 2.

[0099] Eighth Embodiment

[0100] This embodiment proposes a stent delivery system. The stent delivery system disclosed in the eighth embodiment includes the stent delivery device in any one of the first to seventh embodiments. Specifically:

[0101] As Figure 1 , Figure 15As shown, the delivery system includes a catheter sheath 4, which has a lumen 41 therein. One end of the stent delivery device near the distal end can enter the lumen 41 of the catheter sheath 4 and move proximally or distally within the lumen 41, thereby realizing the delivery of the stent 5. Specifically, the stent 5 is sleeved on the stent delivery device and covers the release and retrieval tube 2, the second radiopaque ring 32, and a part of the assembly section 13, and is placed in the lumen 41 of the catheter sheath 4. At this time, the stent 5 is in a compressed state. The stent 5 is delivered by using the frictional force among the catheter sheath 4, the stent 5, and the stent delivery device. Moving one end of the stent delivery device near the distal end distally within the lumen 41 realizes the release of the stent 5. Moving one end of the stent delivery device near the distal end proximally within the lumen 41 realizes the retrieval of the stent 5.

[0102] The above description and the accompanying drawings fully illustrate the embodiments of the present invention, enabling those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments only represent possible variations. Unless explicitly required, the individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The embodiments of the present invention are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A stent delivery device, characterized in that: include: A push wire, which is provided with an assembly section, a diameter-reducing section and a main body section in sequence from the distal end to the proximal end, the wire diameter of the main body section is larger than the wire diameter of the assembly section, the wire diameter of one end of the diameter-reducing section connected to the main body section is the same as the wire diameter of the main body section, the wire diameter of one end of the diameter-reducing section connected to the assembly section is the same as the wire diameter of the assembly section, and the wire diameter of the diameter-reducing section gradually decreases from the proximal end to the distal end; a distal spring is provided at one end of the assembly section close to the distal end; The release recovery pipe comprises a fixed part and a movable part, wherein the fixed part is arranged on the assembly section, one end of the movable part is arranged on the outer surface of the fixed part, and the other end of the movable part is flared; the movable part is arranged at both ends of the fixed part; The first developing ring and the second developing ring are both arranged on the assembly section; the first developing ring is located at the end of the fixing part close to the proximal end; the second developing ring is located at the end of the fixing part close to the distal end, or the second developing ring is located inside the fixing part.

2. The stent delivery device according to claim 1, characterized in that: Also includes: A flexible spring is sleeved on the pushing wire; one end of the flexible spring is arranged at the connection between the main body section and the reducing section; The other end of the flexible spring is located at the first developing ring, and the flexible spring is sleeved on the first developing ring.

3. The stent delivery device according to claim 2, characterized in that: The assembly section is also provided with a buffer section near the distal spring.

4. The stent delivery device according to any one of claims 1 to 3, characterized in that: The outer diameter of the end of the movable portion away from the fixed portion ranges from 1.5 mm to 7.0 mm.

5. The stent delivery device according to claim 4, characterized in that: A plurality of cutouts are arranged at one end of the movable portion away from the fixed portion.

6. The stent delivery device according to claim 5, characterized in that: The length of the movable portion is shorter than the length of the fixed portion.

7. The stent delivery device according to claim 5, characterized in that: Also includes: The developing part is arranged between the fixed part and the movable part.

8. The stent delivery device according to claim 5, characterized in that: The fixed part is provided with a notch for accommodating the movable part.

9. The stent delivery device according to claim 8, characterized in that: A groove is provided in the notch; the stent delivery device further comprises: A developing member is disposed in the groove.

10. The stent delivery device according to claim 9, characterized in that: A plurality of groups of convex points are arranged on the inner wall of the movable part, and the plurality of groups of convex points are arranged in sequence and at intervals from the distal end to the proximal end; each group of convex points includes a plurality of convex points evenly arranged around the axis of the movable part.

11. The stent delivery device according to claim 5, characterized in that: A chamfer is arranged on the inner wall of the movable portion, and the chamfer is located at an end of the movable portion away from the fixed portion.

12. The stent delivery device according to claim 5, characterized in that: When the release recovery pipe is in a compressed state, The movable part is fitted with the fixed part, and the cross-sectional shape of the fitting surface between the two is a straight line or a wavy line.

13. The stent delivery device according to claim 5, characterized in that: The release recovery tube is made of flexible material; The flexible material is a mixture of any one or more materials selected from the group consisting of silicone, TPU, PET, and Pebax.

14. A stent delivery system, characterized in that: include: The stent delivery device according to any one of claims 1 to 13; the stent delivery device can be slidably disposed in the lumen of the catheter sheath.

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