Pushing mechanism and stent conveying system

Abstract

The utility model relates to a pushing mechanism which comprises a pushing guide wire, an assembling wire is arranged at the end, close to the far end, of the pushing guide wire, and the wire diameter of the assembling wire is smaller than that of the pushing guide wire. A variable-diameter wire is further arranged between the pushing guide wire and the assembling wire, the wire diameter, close to the near end, of the variable-diameter wire is the same as the wire diameter of the pushing guide wire, the wire diameter, close to the far end, of the variable-diameter wire is the same as the wire diameter of the assembling wire, and the wire diameter of the variable-diameter wire 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 wire. The at least two first metal rings are arranged on the assembly wire; the first releasing and recycling pipe is arranged on the assembling wire and located between the at least two first metal rings; the second releasing and recycling pipe is arranged on the assembling wire and located between the at least two first metal rings; the first release recovery pipe is tightly attached to the second release recovery pipe. By means of the arrangement, the bending performance is improved, and the risk of support deloading is reduced. The utility model further relates to a stent conveying system.

Description

Technical Field

[0001] The utility model relates to the technical field of stent delivery equipment, in particular to a pushing mechanism and a stent delivery system. Background Art

[0002] Intracranial atherosclerosis can cause thickening and hardening of the cerebral arterial walls, narrowing of the lumen, and even occlusion, leading to reduced or interrupted blood flow in the supplying arteries. Intravascular stent implantation or drug-eluting stents is one of the main treatments for intracranial arterial stenosis.

[0003] During the process of implanting a stent into a blood vessel, a stent delivery device is usually required. The delivery process is completed by pushing the guide wire and cooperating with the catheter sheath to clamp the stent. However, this delivery device has the following disadvantages:

[0004] 1. The size matching requirements between the guide wire, stent and catheter sheath are high, and it is easy to cause the stent to be unloaded during stent retrieval.

[0005] 2. Setting a push block on the push guidewire increases the friction between it and the stent and catheter sheath, but also increases the diameter of the area, reducing the bending performance of the push guidewire.

[0006] 3. Since the distal end of the guide wire is thinner, it is easy to cause a fish-mouth effect when passing through tortuous blood vessels or releasing stents. Figure 1 The figure shows the state of the bracket under the fish-mouth effect (the fish-mouth effect is a professional term well known to those skilled in the art). Utility Model Content

[0007] The utility model provides a pushing mechanism and a stent delivery system to solve the technical problem that the existing pushing guide wire has low bending performance and is prone to stent unloading.

[0008] The utility model discloses a pushing mechanism, which comprises a pushing guide wire, at least two first metal rings, a first release and recovery tube, and a second release and recovery tube. An assembly wire is provided at one end of the pushing guide wire close to the distal end, and the wire diameter of the assembly wire is smaller than the wire diameter of the pushing guide wire; a reducing wire is further provided between the pushing guide wire and the assembly wire, the wire diameter of the reducing wire close to the proximal end is the same as the wire diameter of the pushing guide wire, the wire diameter of the reducing wire close to the distal end is the same as the wire diameter of the assembly wire, and the wire diameter of the reducing wire gradually decreases from the proximal end to the distal end; a distal spring is provided at one end of the assembly wire close to the distal end; at least two first metal rings are both provided on the assembly wire; the first release and recovery tube is provided on the assembly wire and is located between the at least two first metal rings; the second release and recovery tube is provided on the assembly wire and is located between the at least two first metal rings; the first release and recovery tube is provided close to the second release and recovery tube.

[0009] Furthermore, the length of the first release and recovery pipe is longer than the length of the second release and recovery pipe.

[0010] Furthermore, the outer diameter of the first release and recovery tube is greater than the outer diameter of the second release and recovery tube; the outer diameter of the first release and recovery tube ranges from 0.3 mm to 1 mm; the outer diameter of the second release and recovery tube ranges from 0.3 mm to 1 mm.

[0011] Furthermore, the contact surface between the first release and recovery tube and the second release and recovery tube is a plane, an inclined surface, an arc surface, or a V-shaped surface; and the axis of the pushing guide wire is located at the center of the contact surface.

[0012] Furthermore, when the contact surface is a plane or an inclined surface, the contact surface is set at a first angle to the axis of the push guide wire; or, when the contact surface is a V-shaped surface, the angle of the contact surface is a second angle.

[0013] Furthermore, the first release and recovery tube and / or the second release and recovery tube are made of flexible material; the flexible material is a mixture of any one or more materials selected from silicone, TPU, PET, and Pebax.

[0014] Furthermore, the pushing mechanism also includes a second metal ring, which is arranged at the connection between the assembly wire and the reducing wire.

[0015] Furthermore, an anti-bending tube is provided between the first metal ring and the second metal ring near the proximal end; the anti-bending tube is made of a flexible material; the flexible material is a mixture of any one or more materials selected from silicone, TPU, PET, and Pebax; the outer diameter of the anti-bending tube is less than or equal to the outer diameter of the first release and recovery tube, or the outer diameter of the anti-bending tube is less than or equal to the outer diameter of the second release and recovery tube.

[0016] Furthermore, the first release recovery tube and / or the second release recovery tube is smaller than the outer diameter of the second metal ring, and the first release recovery tube and / or the second release recovery tube is larger than the outer diameter of the first metal ring.

[0017] Furthermore, the first metal ring and the second metal ring are both made of developing material.

[0018] Furthermore, the pushing mechanism also includes a reinforcing spring, which is sleeved on the reducing wire, and one end of the reinforcing spring close to the distal end abuts against the second metal ring.

[0019] Furthermore, the pushing mechanism also includes an anti-scattering tube, which can be slidably arranged on the assembly wire; the anti-scattering tube is located between the first metal ring near the distal end and the distal spring, and the outer diameter of the distal spring is larger than the wire diameter of the assembly wire; the outer diameter of the anti-scattering tube is less than or equal to the outer diameter of the first release and recovery tube, or the outer diameter of the anti-scattering tube is less than or equal to the outer diameter of the second release and recovery tube.

[0020] Furthermore, a cutout is provided on the anti-bending pipe; and / or a cutout is provided on the anti-scattering pipe.

[0021] The utility model discloses a stent delivery system, which comprises a pushing mechanism as described in any one of the above items; the pushing mechanism is slidably arranged in a catheter cavity of a catheter sheath.

[0022] The pushing mechanism and stent delivery system provided by the utility model can achieve the following technical effects:

[0023] In the prior art, a release mark, a retrieval mark and a complete release mark are usually set on the push guidewire. The release mark, the retrieval mark and the complete release mark are all made of the same material as the push guidewire, and the release mark, the retrieval mark and the complete release mark are all integrally formed with the push guidewire. This results in the outer diameters of the release mark, the retrieval mark and the complete release mark being fixed sizes, and the size matching requirements between the push guidewire, the stent and the catheter sheath are high, and it is easy for the stent to be unloaded due to insufficient friction.

[0024] Compared to the prior art, in this embodiment, two first metal rings are provided on the assembly wire, and the first and second release and recovery tubes are positioned between the two first metal rings. These two first metal rings act as position limiters for the first and second release and recovery tubes. During use, the push mechanism disclosed in this utility model is positioned within the catheter lumen of the catheter sheath, and the push mechanism and the catheter sheath clamp the stent. The distal end of the push mechanism can move along the catheter lumen.

[0025] As the pushing mechanism drives the stent toward the distal end, the first and second release and recovery tubes move toward the distal end and are limited by the first metal ring near the distal end. Simultaneously, the first and second release and recovery tubes slide toward the first metal ring near the distal end and are squeezed, causing elastic deformation of the first and second release and recovery tubes. This increases the outer diameters of the first and second release and recovery tubes, increasing friction. As friction increases, the pushing mechanism and the catheter sheath further strengthen their grip on the stent, reducing the risk of stent unloading. This also facilitates stent release.

[0026] As the pushing mechanism drives the stent toward the proximal end, the first and second release and recovery tubes move toward the proximal end and are limited by the first metal ring near the proximal end. The first and second release and recovery tubes simultaneously slide toward the first metal ring near the proximal end and are squeezed, causing elastic deformation of the first and second release and recovery tubes. This increases the outer diameters of the first and second release and recovery tubes, thereby increasing friction. As friction increases, the pushing mechanism and the catheter sheath further strengthen their grip on the stent, reducing the risk of stent unloading. This also facilitates stent recovery.

[0027] The push mechanism disclosed in the present invention also utilizes a segmented design of the first and second release and recovery tubes, which not only improves the bending performance of the section but also effectively increases the flexural resistance of the section. This also reduces the risk of deformation and failure of the release and recovery tubes due to excessive vascular tortuosity.

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

[0029] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are considered similar elements, and wherein:

[0030] Figure 1 It is a background technology diagram;

[0031] Figure 2 This is a schematic diagram of an embodiment of a push mechanism of the utility model Figure 1 ;

[0032] Figure 3 This is a schematic diagram of an embodiment of a push mechanism of the utility model Figure 2 ;

[0033] Figure 4 This is a schematic diagram of an embodiment of the first release and recovery tube and the second release and recovery tube of a pushing mechanism of the utility model. Figure 1 ;

[0034] Figure 5 This is a schematic diagram of an embodiment of the first release and recovery tube and the second release and recovery tube of a pushing mechanism of the utility model. Figure 2 ;

[0035] Figure 6 This is an explosion diagram of an embodiment of the first release and recovery tube and the second release and recovery tube of a pushing mechanism of the utility model. Figure 1 ;

[0036] Figure 7 This is a schematic diagram of an embodiment of the first release and recovery tube and the second release and recovery tube of a pushing mechanism of the utility model. Figure 3 ;

[0037] Figure 8 This is an explosion diagram of an embodiment of the first release and recovery tube and the second release and recovery tube of a pushing mechanism of the utility model. Figure 2 ;

[0038] Figure 9This is a schematic diagram of an embodiment of the first release and recovery tube and the second release and recovery tube of a pushing mechanism of the utility model. Figure 4 ;

[0039] Figure 10 This is a schematic diagram of an embodiment of an anti-bending tube of a pushing mechanism of the utility model;

[0040] Figure 11 This is a schematic diagram of an embodiment of an anti-scattering tube of a pushing mechanism of the utility model;

[0041] Figure 12 It is a schematic cross-sectional view of an embodiment of a stent delivery system of the present invention.

[0042] Reference numerals:

[0043] 11. Push guide wire; 12. Reducer wire; 13. Assembly wire; 14. Distal spring; 21. First metal ring; 22. First gap; 23. Second metal ring; 24. Reinforcement spring; 25. Second gap; 31. First release and recovery tube; 32. Second release and recovery tube; 33. Contact surface; 331. Circular convex surface; 332. Circular concave surface; 333. Inner concave surface; 334. Outer convex surface; 41. Anti-bending tube; 42. Incision; 43. Anti-scattering tube; 5. Catheter sheath; 51. Catheter cavity; 6. Stent. DETAILED DESCRIPTION

[0044] In order to be able to understand the features and technical contents of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not intended to limit the embodiments of the present invention. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0045] In the description and claims of the embodiments of the present invention, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that such terms are interchangeable where appropriate to describe the embodiments of the present invention herein. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0046] In the embodiments of the present invention, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present invention and its embodiments, and are not intended to limit the devices, elements or components indicated to having a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. 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.

[0047] Furthermore, the terms "disposed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or an internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the embodiments of the present invention based on the specific circumstances.

[0048] Unless otherwise specified, the term "plurality" means two or more and "plurality" means two or more.

[0049] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0050] In the present invention, the distal end refers to the end away from the operator during surgery, and the proximal end refers to the end close to the operator during surgery.

[0051] First embodiment

[0052] A pushing mechanism mentioned in this embodiment, such as Figure 2 、 Figure 3As shown, the pushing mechanism includes a pushing guide wire 11, at least two first metal rings 21, a first release and recovery tube 31, and a second release and recovery tube 32. In this embodiment, for the convenience of subsequent description, the two first metal rings 21 will be used as an example. The pushing guide wire 11 is provided with an assembly wire 13 at the distal end, and a reducing wire 12 is further provided between the pushing guide wire 11 and the assembly wire 13. The pushing guide wire 11, the assembly wire 13, and the reducing wire 12 are integrally formed. The wire diameter of the assembly wire 13 is smaller than the wire diameter of the pushing guide wire 11, that is, the pushing guide wire 11 is thicker than the assembly wire 13. The wire diameter of the reducing wire 12 near the proximal end is the same as that of the pushing guide wire 11, which facilitates the fixed connection between the proximal end of the reducing wire 12 and the distal end of the pushing guide wire 11. The wire diameter of the reducing wire 12 near the distal end is the same as that of the assembly wire 13, which facilitates the fixed connection between the proximal end of the assembly wire 13 and the distal end of the reducing wire 12. The diameter of the reducing wire 12 gradually decreases from the proximal end to the distal end, and the reducing wire 12 can serve as a transition between the diameter of the push guide wire 11 and the diameter of the assembly wire 13. This arrangement can not only ensure that the pushing mechanism has sufficient structural strength, but also facilitate the pushing mechanism to deliver the stent 6 to a more distal position in the blood vessel.

[0053] like Figure 2 、 Figure 3 As shown, a distal spring 14 is provided at the distal end of the assembly wire 13. One end of the distal spring 14 is fixedly connected to the distal end of the assembly wire 13. The other end of the distal spring 14 is provided with a round head to prevent damage to the inner wall of the blood vessel during the delivery of the stent 6. Two first metal rings 21 are provided on the assembly wire 13. The two first metal rings 21 are located at the proximal end of the assembly wire 13, and a first gap 22 is formed between the two first metal rings 21. A first release and recovery tube 31 and a second release and recovery tube 32 are both provided on the assembly wire 13. The first release and recovery tube 31 and the second release and recovery tube 32 are both located within the first gap 22. The two first metal rings 21 limit the first release and recovery tube 31 and the second release and recovery tube 32 to prevent them from slipping off the assembly wire 13. One end of the first release and recovery tube 31 abuts against the end face of a first metal ring 21 near the proximal end, the other end of the first release and recovery tube 31 abuts against one end of the second release and recovery tube 32, and the other end of the second release and recovery tube 32 abuts against the end face of another first metal ring 21 near the distal end.

[0054] Optionally, the outer diameter of the first release recovery tube 31 is greater than the outer diameter of the first metal ring 21 .

[0055] Optionally, the outer diameter of the second release recovery tube 32 is greater than the outer diameter of the first metal ring 21 .

[0056] The specific arrangement of the first release recovery pipe 31 and the second release recovery pipe 32 is as follows:

[0057] Optionally, the first release and recovery tube 31 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 any of silicone, TPU, PET, and Pebax. This arrangement facilitates elastic deformation of the first release and recovery tube 31 and the second release and recovery tube 32 during compression, thereby compensating for the outer diameter of the first release and recovery tube 31 and increasing friction.

[0058] Optionally, the second release and recovery tube 32 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 any of silicone, TPU, PET, and Pebax. This arrangement facilitates elastic deformation of the second release and recovery tube 32 when squeezed against the first release and recovery tube 31, thereby compensating for the outer diameter of the second release and recovery tube 32 and increasing friction.

[0059] Optionally, the above two optional technical solutions can be combined to further increase the clamping force of the release recovery tube and the catheter sheath 5 on the stent 6 through the cooperation between the first release recovery tube 31 and the second release recovery tube 32 and the use of material properties.

[0060] In this embodiment, any one of the above optional technical solutions may be selected.

[0061] In the prior art, a release mark, a recovery mark and a complete release mark are usually set on the push guide wire 11. The release mark, the recovery mark and the complete release mark are all made of the same material as the push guide wire 11, and the release mark, the recovery mark and the complete release mark are all integrally formed with the push guide wire 11. This results in the outer diameters of the release mark, the recovery mark and the complete release mark being fixed sizes, and the size matching requirements between the push guide wire 11, the stent 6 and the catheter sheath 5 are high, and it is easy for the stent 6 to be unloaded due to insufficient friction.

[0062] Compared to the prior art, this embodiment employs two first metal rings 21 disposed on the assembly wire 13, and the first and second release and recovery tubes 31, 32 are positioned between the two first metal rings 21. These two first metal rings 21 act as position limiters for the first and second release and recovery tubes 31, 32. During use, the push mechanism disclosed in this utility model is disposed within the catheter lumen 51 of the catheter sheath 5, and the push mechanism and the catheter sheath 5 clamp the stent 6. The distal end of the push mechanism can move along the catheter lumen 51.

[0063] In the process of the pushing mechanism driving the stent 6 to move toward the distal end, the first release and recovery tube 31 and the second release and recovery tube 32 move toward the proximal end due to the friction force, and the first release and recovery tube 31 and the second release and recovery tube 32 both undergo elastic deformation, which can increase the outer diameter of the first release and recovery tube 31 and the second release and recovery tube 32, thereby increasing the friction force. As the friction force increases, the pushing mechanism and the catheter sheath 5 further enhance the clamping force of the stent 6, thereby reducing the risk of the stent 6 being unloaded and facilitating the release of the stent 6.

[0064] In the process of the pushing mechanism driving the stent 6 to move toward the proximal end, the first release and recovery tube 31 and the second release and recovery tube 32 move toward the distal end due to the friction force, and the first release and recovery tube 31 and the second release and recovery tube 32 both undergo elastic deformation, which can increase the outer diameter of the first release and recovery tube 31 and the second release and recovery tube 32, thereby increasing the friction force. As the friction force increases, the pushing mechanism and the catheter sheath 5 further enhance the clamping force of the stent 6, thereby reducing the risk of the stent 6 being unloaded and facilitating the recovery of the stent 6.

[0065] The push mechanism disclosed in the present invention also utilizes a segmented design of the first release and recovery tube 31 and the second release and recovery tube 32, which not only improves the bending performance of the section but also effectively increases the flexural resistance of the section. This also reduces the risk of deformation and failure of the release and recovery tube due to excessive vascular tortuosity.

[0066] Second embodiment

[0067] This embodiment also proposes a pushing mechanism. The second embodiment is a further improvement based on the first embodiment, and the main improvement lies in the structure of the first release recovery pipe 31 and the second release recovery pipe 32. The specific solution is as follows:

[0068] Alternatively, as Figure 4 As shown, the length of the first release and recovery tube 31 is longer than the length of the second release and recovery tube 32. This further increases the friction of the first release and recovery tube 31, thereby further enhancing the holding force of the first release and recovery tube 31 and the catheter sheath 5 on the stent 6. Of course, the position of the first release and recovery tube 31 can also be interchanged with the position of the second release and recovery tube 32.

[0069] Optionally, the outer diameter of the first release and recovery tube 31 ranges from 0.3 mm to 1 mm, and the outer diameter of the second release and recovery tube 32 ranges from 0.3 mm to 1 mm. The outer diameter of the first release and recovery tube 31 is greater than the outer diameter of the second release and recovery tube 32. This further increases the friction of the first release and recovery tube 31, thereby further enhancing the holding force of the first release and recovery tube 31 and the catheter sheath 5 on the stent 6. Of course, the position of the first release and recovery tube 31 can also be interchanged with the position of the second release and recovery tube 32.

[0070] Optionally, the above two optional technical solutions may be combined.

[0071] In this embodiment, any one of the above optional technical solutions may be selected.

[0072] Third embodiment

[0073] The third embodiment is a further improvement based on the first or second embodiment, and the main improvement lies in the shape of the contact surface 33 between the first release and recovery tube 31 and the second release and recovery tube 32, as follows:

[0074] Alternatively, as Figure 3 、 Figure 4 As shown, the contact surface 33 between the first release and recovery tube 31 and the second release and recovery tube 32 is a plane. The push guidewire 11 passes through the contact surface 33 and is located at the center of the contact surface 33. The contact surface 33 is perpendicular to the axis of the push guidewire 11, that is, the axis of the push guidewire 11 can be regarded as being located at the center of the contact surface 33. A first angle a is formed between the contact surface 33 and the axis of the push guidewire 11, and the first angle a is 90°.

[0075] Alternatively, as Figure 5 As shown, the contact surface 33 between the first release and recovery tube 31 and the second release and recovery tube 32 is an inclined surface. The push guide wire 11 passes through the contact surface 33 and is located at the center of the contact surface 33. The contact surface 33 is tilted to the axis of the push guide wire 11, that is, the axis of the push guide wire 11 can be regarded as being located at the center of the contact surface 33. A first angle a is formed between the contact surface 33 and the axis of the push guide wire 11, and the first angle a is 30° to 70°. Such a setting is more conducive to the elastic deformation of the first release and recovery tube 31 and the second release and recovery tube 32 during the process of pushing the bracket 6 or recovering the bracket 6, so as to increase friction.

[0076] Alternatively, as Figure 6 、 Figure 7As shown, the first release and recovery tube 31 is arranged near the proximal end, and the second release and recovery tube 32 is arranged near the distal end. The end surface of the first release and recovery tube 31 near one end of the second release and recovery tube 32 is a circular convex surface 331, and the end surface of the second release and recovery tube 32 near one end of the first release and recovery tube 31 is a circular concave surface 332, and the circular convex surface 331 is adapted to the circular concave surface 332. When the circular convex surface 331 of the first release and recovery tube 31 contacts the circular concave surface 332 of the second release and recovery tube 32, the contact surface 33 between the first release and recovery tube 31 and the second release and recovery tube 32 is an arc surface, and the push guide wire 11 passes through the contact surface 33 and is located at the center of the contact surface 33, that is, it can be regarded as that the axis of the push guide wire 11 is located at the center of the contact surface 33. Of course, the first release and recovery tube 31 can also be arranged near the distal end, and the second release and recovery tube 32 can also be arranged near the proximal end. Such a configuration is more conducive to the elastic deformation of the first release and recovery tube 31 and the second release and recovery tube 32 during the process of pushing the stent or recovering the stent, thereby increasing friction.

[0077] Alternatively, as Figure 8 、 Figure 9 As shown, the first release and recovery tube 31 is arranged near the proximal end, and the second release and recovery tube 32 is arranged near the distal end. The end surface of the first release and recovery tube 31 near the end of the second release and recovery tube 32 is an inner concave surface 333, and the cross-sectional shape of the inner concave surface 333 is V-shaped. The end surface of the second release and recovery tube 32 near the end of the first release and recovery tube 31 is an outer convex surface 334, and the outer convex surface 334 is adapted to the inner concave surface 333. When the inner concave surface 333 of the first release and recovery tube 31 contacts the outer convex surface 334 of the second release and recovery tube 32, the contact surface 33 between the first release and recovery tube 31 and the second release and recovery tube 32 is a V-surface, and the angle formed by the V-surface is the second angle b, and the value range of the second angle b is 30° to 60°. The push guide wire 11 passes through the contact surface 33 and is located at the center of the contact surface 33, that is, it can be regarded as that the axis of the push guide wire 11 is located at the center of the contact surface 33. Of course, the first release and recovery tube 31 can also be arranged near the distal end, and the second release and recovery tube 32 can also be arranged near the proximal end. Such an arrangement is more conducive to the elastic deformation of the first release and recovery tube 31 and the second release and recovery tube 32 during the process of pushing or recovering the stent, thereby increasing friction.

[0078] In this embodiment, any one of the above optional technical solutions may be selected.

[0079] Of course, the above optional technical solution can also be combined with the optional technical solution in which both the first release and recovery tube 31 and the second release and recovery tube 32 are made of flexible materials.

[0080] Fourth embodiment

[0081] This embodiment also proposes a pushing mechanism. The fourth embodiment is a further improvement based on any one of the first to third embodiments, and the main improvements are:

[0082] Alternatively, as Figure 2 、 Figure 3 As shown, the pushing mechanism further includes a second metal ring 23, which is arranged at the connection between the assembly wire 13 and the reducer wire 12. This can enhance the structural strength of the connection between the reducer wire 12 and the assembly wire 13.

[0083] Alternatively, as Figure 2 、 Figure 3 As shown, the pushing mechanism also includes a reinforcing spring 24, which is sleeved onto the reducing wire 12. One end of the reinforcing spring 24 abuts the proximal end of the reducing wire 12, and the other end of the reinforcing spring 24 abuts the second metal ring 23. By sleeved onto the reducing wire 12, the structural strength of the reducing wire 12 is further enhanced. The second metal ring 23 also serves to limit the reinforcing spring 24.

[0084] Optionally, the first metal ring 21 can be made of any developing material among platinum tungsten, platinum iridium, and tantalum, so that the operator can observe the position of the first metal ring 21 during the operation.

[0085] Optionally, the second metal ring 23 can be made of any developing material among platinum tungsten, platinum iridium, and tantalum, so that the surgeon can observe the position of the second metal ring 23 during the operation.

[0086] Alternatively, as Figure 2 、 Figure 3 As shown, a second gap 25 exists between the second metal ring 23 and the first metal ring 21 near the proximal end. The pushing mechanism also includes an anti-bending tube 41, which is located within the second gap 25. Optionally, the anti-bending tube 41 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 any of silicone, TPU, PET, and Pebax.

[0087] Optionally, the outer diameter of the anti-bending tube 41 is smaller than or equal to the outer diameter of the first release recovery tube 31 . Alternatively, the outer diameter of the anti-bending tube 41 is smaller than or equal to the outer diameter of the second release recovery tube 32 .

[0088] Alternatively, as Figure 3 、 Figure 10As shown, the outer wall of the anti-bend tube 41 has multiple cutouts 42. The cutouts 42 are arranged perpendicular to the axis of the anti-bend tube 41, or are arranged obliquely to the axis of the anti-bend tube 41. The cutouts 42 are evenly distributed around the axis of the anti-bend tube 41. This arrangement increases the passability of the anti-bend tube 41 and facilitates bending of the anti-bend tube 41.

[0089] 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.

[0090] Compared to the prior art, this embodiment further includes an anti-bend tube 41 on the assembly wire 13. This tube further reduces the gap between the guide wire 11, the stent 6, and the catheter sheath 5. When the push mechanism disclosed in this embodiment passes through tortuous blood vessels, the anti-bend tube 41 provides support, preventing the stent 6 from bending or falling apart, thereby reducing the risk of a fish-mouth effect. Furthermore, the risk of a fish-mouth effect occurring during the release of the stent 6 is reduced.

[0091] Fifth embodiment

[0092] This embodiment also proposes a pushing mechanism. The fifth embodiment is a further improvement based on any one of the first to fourth embodiments, and the main improvements are:

[0093] Alternatively, as Figure 3 As shown, the outer diameter of the first release and recovery tube 31 is smaller than the outer diameter of the second metal ring 23 , and the outer diameter of the first release and recovery tube 31 is larger than the outer diameter of the first metal ring 21 .

[0094] Alternatively, as Figure 3 As shown, the outer diameter of the second release recovery tube 32 is smaller than the outer diameter of the second metal ring 23 , and the outer diameter of the second release recovery tube 32 is larger than the outer diameter of the first metal ring 21 .

[0095] Of course, the above two technical solutions can also be combined.

[0096] Compared with the prior art, in this embodiment, when both the first release recovery tube 31 and the second release recovery tube 32 fail, such a setting can enable the second metal ring 23 to push the bracket 6 to release, thereby playing the role of a release recovery tube.

[0097] Sixth embodiment

[0098] This embodiment also proposes a pushing mechanism. The sixth embodiment is a further improvement based on any one of the first to fifth embodiments, and the main improvements are:

[0099] Alternatively, as Figure 2 、 Figure 3As shown, the pushing mechanism also includes an anti-scattering tube 43, which is sleeved on the assembly wire 13. The anti-scattering tube 43 is located between the first metal ring 21 near the distal end and the distal spring 14, and the outer diameter of the distal spring 14 is larger than the wire diameter of the assembly wire 13. At the same time, the inner diameter of the release tube is larger than the wire diameter of the assembly wire 13, and the inner diameter of the release tube is smaller than the outer diameter of the distal spring 14. Such an arrangement allows the anti-scattering tube 43 to slide along the length direction of the assembly wire 13, and the distal spring 14 also acts as a limiter to prevent the release tube from slipping off the assembly wire 13. Optionally, the outer diameter of the anti-scattering tube 43 is less than or equal to the outer diameter of the first release and recovery tube 31, or the outer diameter of the anti-scattering tube 43 is less than or equal to the outer diameter of the second release and recovery tube 32.

[0100] Alternatively, as Figure 2 、 Figure 11 As shown, the outer wall of the anti-scattering tube 43 has multiple cutouts 42. The cutouts 42 are arranged perpendicular to the axis of the anti-scattering tube 43, or they are arranged obliquely to the axis of the anti-scattering tube 43. The cutouts 42 are evenly distributed around the axis of the anti-scattering tube 43. This arrangement increases the passability of the anti-scattering tube 43 and facilitates bending of the anti-scattering tube 43.

[0101] Compared to the prior art, this embodiment further includes a dispersion control tube 43 on the assembly wire 13. This tube further reduces the gap between the guide wire 11, the stent 6, and the catheter sheath 5. When the push mechanism disclosed in this embodiment passes through tortuous blood vessels, the dispersion control tube 43 provides support, preventing the stent 6 from bending or dislodging, thereby reducing the risk of a fish-mouth effect. Furthermore, the risk of a fish-mouth effect occurring during the release of the stent 6 is reduced.

[0102] The anti-scattering tube 43 can slide on the assembly wire 13. During the release of the stent 6, the anti-scattering tube 43 can slide down to the first metal ring 21 near the distal end and abut against it, thus avoiding affecting the bending performance of the push guide wire 11. During the release of the stent 6, if the tapered portion of the stent 6 formed at the catheter port of the catheter sheath 5 is not opened, the anti-scattering tube 43 can effectively open this portion.

[0103] In this embodiment, there is also a technical solution, in which the pushing mechanism is simultaneously provided with a first release and recovery tube 31, a second release and recovery tube 32, an anti-bending tube 41 and an anti-scattering tube 43. Such a multi-stage design can not only ensure the bending performance of the pushing mechanism, reduce the risk of the bracket 6 being unloaded, but also reduce the risk of the fish-mouth effect.

[0104] Seventh embodiment

[0105] This embodiment proposes a conveying system. The system disclosed in the seventh embodiment includes the pushing mechanism of any one of the first to sixth embodiments, specifically:

[0106] like Figure 3 、 Figure 12 As shown, the delivery system includes a catheter sheath 5, and the catheter sheath 5 has a catheter cavity 51. The end of the pushing mechanism close to the distal end can enter the catheter cavity 51 of the catheter sheath 5, and move toward the proximal end or the distal end in the catheter cavity 51, thereby realizing the delivery of the stent 6. Specifically, the stent 6 is sleeved on the pushing mechanism, and is located at the first release and recovery tube 31 and the second release and recovery tube 32, and is placed in the catheter cavity 51 of the catheter sheath 5. At this time, the stent 6 is in a compressed state. The friction force of the three stents 6 is used to transport the stent 6. The end of the pushing mechanism close to the distal end is moved toward the distal end in the catheter cavity 51, thereby realizing the release of the stent 6. The end of the pushing mechanism close to the distal end is moved toward the proximal end in the catheter cavity 51, thereby realizing the recovery of the stent 6.

[0107] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present invention to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless expressly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions 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 may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A pushing mechanism, characterized in that: include: A push guide wire, one end of which is close to the distal end, is provided with an assembly wire, and the wire diameter of the assembly wire is smaller than the wire diameter of the push guide wire; A reducing wire is further provided between the push guide wire and the assembly wire. The diameter of the reducing wire near the proximal end is the same as that of the push guide wire, and the diameter of the reducing wire near the distal end is the same as that of the assembly wire. The diameter of the reducing wire gradually decreases from the proximal end to the distal end. A distal spring is provided at one end of the assembly wire near the distal end. at least two first metal rings, both disposed on the assembly wire; a first release and recovery tube, provided on the assembly wire and located between at least two first metal rings; The second release and recovery tube is arranged on the assembly wire and located between at least two first metal rings; the first release and recovery tube is arranged closely to the second release and recovery tube.

2. The pushing mechanism according to claim 1, characterized in that: The length of the first release and recovery pipe is longer than that of the second release and recovery pipe.

3. The pushing mechanism according to claim 1, characterized in that: The outer diameter of the first release and recovery pipe is greater than the outer diameter of the second release and recovery pipe; The outer diameter of the first release recovery tube ranges from 0.3 mm to 1 mm; The outer diameter of the second release and recovery tube ranges from 0.3 mm to 1 mm.

4. The pushing mechanism according to claim 1, characterized in that: The contact surface between the first release and recovery tube and the second release and recovery tube is a plane, an inclined surface, an arc surface, or a V-shaped surface; the axis of the push guide wire is located at the center of the contact surface.

5. The pushing mechanism according to claim 4, characterized in that: When the contact surface is a plane or an inclined surface, the contact surface is arranged at a first angle to the axis of the guide wire; or When the contact surface is a V-shaped surface, the angle of the contact surface is a second angle.

6. The pushing mechanism according to any one of claims 1 to 5, characterized in that: The first release and recovery tube and / or the second release and recovery tube are made of flexible material; The flexible material is made of a mixture of any one or more materials selected from the group consisting of silicone, TPU, PET, and Pebax.

7. The pushing mechanism according to claim 1, characterized in that: Also includes: The second metal ring is arranged at the connection between the assembly wire and the reducing wire.

8. The pushing mechanism according to claim 7, characterized in that: An anti-bending tube is further provided between the first metal ring near the proximal end and the second metal ring; The anti-bending tube is made of a flexible material; the flexible material is a mixture of any one or more materials selected from silicone, TPU, PET, and Pebax; The outer diameter of the anti-bending pipe is smaller than or equal to the outer diameter of the first release and recovery pipe, or the outer diameter of the anti-bending pipe is smaller than or equal to the outer diameter of the second release and recovery pipe.

9. The pushing mechanism according to claim 8, characterized in that: The first release recovery tube and / or the second release recovery tube are smaller than the outer diameter of the second metal ring, and the first release recovery tube and / or the second release recovery tube are larger than the outer diameter of the first metal ring.

10. The pushing mechanism according to claim 8, characterized in that: The first metal ring and the second metal ring are both made of developing material.

11. The pushing mechanism according to claim 8, characterized in that: Also includes: The reinforcing spring is sleeved on the reducing wire, and one end of the reinforcing spring close to the distal end abuts against the second metal ring.

12. The pushing mechanism according to any one of claims 8 to 11, characterized in that: Also includes: An anti-scattering tube is slidably disposed on the assembly wire; the anti-scattering tube is located between the first metal ring near the distal end and the distal spring, and the outer diameter of the distal spring is larger than the wire diameter of the assembly wire; The outer diameter of the anti-scattering pipe is smaller than or equal to the outer diameter of the first release and recovery pipe, or the outer diameter of the anti-scattering pipe is smaller than or equal to the outer diameter of the second release and recovery pipe.

13. The pushing mechanism according to claim 12, characterized in that: The anti-bending pipe is provided with a cutout; and / or the anti-scattering pipe is provided with a cutout.

14. A stent delivery system, characterized in that: include: The pushing mechanism according to any one of claims 1 to 13; the pushing mechanism is slidably arranged in the catheter cavity of the catheter sheath.

Images