Support pushing system

Abstract

The utility model provides a support pushing system. The stent pushing system comprises a sheath tube; at least one part of the pushing part is movably arranged in the sheath tube, one end of the pushing part can extend out of or return to the sheath tube, and the part, extending out of the sheath tube, of the pushing part is provided with a clamping jaw structure; the support and the clamping jaw structure can pick up or put down the support, the support is of a deformable structure, and when the support enters the sheathing canal along with the pushing piece, at least one part of the support shrinks; the loader is arranged at one end of the sheathing canal, the pushing piece can penetrate through the loader and extend out of the sheathing canal, and the opening area of the end, away from the sheathing canal, of the loader is larger than that of the end, close to the sheathing canal, of the loader. The problem that in the prior art, a support cannot be repeatedly positioned and recycled is solved.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, and in particular to a bracket pushing system. Background Art

[0002] With the improvement of people's living standards and the gradual intensification of the aging trend of the population, the incidence of vascular diseases is getting worse, among which cardiovascular diseases represented by angina pectoris are particularly dangerous.

[0003] Angina pectoris is a clinical syndrome characterized by paroxysmal chest pain or chest discomfort caused by insufficient blood supply to the coronary arteries, acute temporary myocardial ischemia and hypoxia. Angina pectoris is the pain felt when cardiac ischemia is reflected on the surface of the body. It is characterized by paroxysmal, squeezing pain in the anterior chest, which may be accompanied by other symptoms. The pain is mainly located behind the sternum and can radiate to the precordial area and left upper limb. The direct cause of angina pectoris is insufficient blood supply to the myocardium, which is usually a symptom of coronary artery disease.

[0004] An estimated 10% of all patients with angina suffer from symptoms that are severe, persistent, and uncontrollable with conventional medical treatments. This severe, debilitating condition is known as refractory angina. Currently, in addition to conservative medication, intracoronary sinus stenting is considered a promising treatment for refractory angina. Its mechanism of action is to narrow the coronary sinus diameter, establish a trans-sinus pressure gradient, increase back pressure, improve the ratio of epicardial and subendocardial blood perfusion, and increase oxygen-rich blood flow to previously abnormal heart areas, thereby alleviating myocardial ischemia.

[0005] The current implanted stents are made from cut stainless steel and require a balloon for delivery and release. The operation procedure is relatively complicated, placing high demands on the operator's operation, and it is also impossible to repeatedly position and recover it.

[0006] Usually during interventional surgery, the implant may not be accurately released to the intended position due to limitations in monitoring methods and the surgeon's experience. Non-recoverable stents on the market can often only be captured a second time with a capture device, which is difficult to operate and has a relatively low success rate. In extreme cases, the ectopic stent can only be removed through surgery, which is more traumatic and risky.

[0007] Therefore, there is a problem in the prior art that the stent cannot be repeatedly positioned and recovered. Utility Model Content

[0008] The main purpose of the utility model is to provide a stent pushing system to solve the problem in the prior art that stents cannot be repeatedly positioned and recovered.

[0009] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a stent pushing system is provided, including: a sheath; a pushing member, at least a part of the pushing member is movably arranged inside the sheath, one end of the pushing member can extend out of or retract into the sheath, and the part of the pushing member extending out of the sheath has a claw structure; a stent, the claw structure can pick up or put down the stent, and the stent is a deformable structure, when the stent enters the sheath together with the pushing member, at least a part of the stent contracts.

[0010] Furthermore, the pushing member includes a steel cable, and at least a portion of the claw structure is movably arranged on the steel cable. When the claw structure picks up the bracket, the claw structure abuts against the outer side wall of the bracket.

[0011] Furthermore, the claw structure includes at least two movable arms, one end of the movable arm is connected to the steel cable, and the other end of the movable arm can move relative to the steel cable to change the angle between the movable arm and the steel cable.

[0012] Furthermore, one end of the movable arm that cooperates with the bracket has a spherical protrusion; or one end of the movable arm that cooperates with the bracket has an arc surface.

[0013] Furthermore, the stent pushing system also includes a loader, which is arranged at one end of the sheath, the pushing member can pass through the loader and extend out of the sheath, and the opening area of ​​the loader end away from the sheath is larger than the opening area of ​​the loader end close to the sheath.

[0014] Furthermore, the interior of the loader has a first hole segment and a second hole segment connected to each other, one end of the first hole segment away from the second hole segment is connected to the sheath tube, and the opening areas of the first hole segment and the second hole segment gradually increase in the direction away from the sheath tube.

[0015] Furthermore, the connection between the first hole segment and the second hole segment has a step surface, and the opening diameter of the end of the first hole segment close to the second hole segment is larger than the opening diameter of the end of the second hole segment close to the first hole segment, and the opening diameter of the end of the second hole segment away from the first hole segment is larger than the opening diameter of the end of the first hole segment close to the second hole segment.

[0016] Furthermore, the distance from the inner side wall of the second hole segment at one end away from the first hole segment to the axis of the steel cable is greater than the distance from the end of the movable arm that cooperates with the bracket to the axis of the steel cable when the angle between the movable arm and the steel cable reaches a maximum; and / or the distance from the inner side wall of the second hole segment at one end close to the first hole segment to the axis of the steel cable is less than the distance from the end of the movable arm that cooperates with the bracket to the axis of the steel cable when the angle between the movable arm and the steel cable reaches a maximum; and / or the radius of the end of the second hole segment close to the first hole segment is greater than the radius when the bracket is not contracted.

[0017] Furthermore, the sheath tube, the steel cable, the first hole section, and the second hole section are coaxially arranged.

[0018] Furthermore, the loader includes a main body and a connecting part, the main body has a first hole segment and a second hole segment, the loader is sleeved on the sheath through the connecting part, and the radius of the end of the first hole segment away from the second hole segment is the same as the radius of the end of the sheath tube close to the loader.

[0019] Furthermore, the pushing member includes a steel cable, and at least a part of the claw structure is movably arranged at one end of the steel cable extending out of the sheath tube. When the claw structure picks up the bracket, the claw structure extends into the interior of the bracket.

[0020] Furthermore, the claw structure includes at least two conveying arms, which are connected to the steel cable. One end of the conveying arm that cooperates with the bracket is arc-shaped, and the center of the arc is located on the side of the conveying arm away from the steel cable.

[0021] Furthermore, the opening of one end of the sheath tube from which the pushing member extends is in a trumpet shape.

[0022] Furthermore, at least one end of the bracket that cooperates with the claw structure has a curved surface.

[0023] Applying the technical solution of the utility model, the stent pushing system in the present application includes a sheath, a pushing member and a stent. At least a part of the pushing member is movably arranged inside the sheath, one end of the pushing member can extend out of or retract into the sheath, and the part of the pushing member extending out of the sheath has a claw structure; the claw structure can pick up or put down the stent, and the stent is a deformable structure, and when the stent enters the sheath together with the pushing member, at least a part of the stent shrinks.

[0024] When using the stent push system in the present application, since there is a sheath and a push piece, the movement of the stent can be achieved by the mutual cooperation of the sheath and the push piece. In the present application, when the stent needs to be released, the push piece and the stent are both located inside the sheath, and the sheath is withdrawn after the sheath moves to the target position. At this time, the push piece and the stent move relative to the sheath and extend out of the sheath, and the stent can be completely separated from the sheath as the sheath is withdrawn, thereby completing the release of the stent. After the stent is released, the position of the stent can be judged. If there is an error between the position of the stent and the target position, the stent can be picked up by the claw structure of the push piece, and the stent can be driven to move together by the claw structure. Since the stent is a deformable structure, the stent can be deformed in the process of entering the inside of the sheath with the push piece to adapt to the size of the sheath, thereby ensuring that the stent smoothly enters the inside of the sheath. After the stent returns to the inside of the sheath, the sheath can be driven to move again, and the stent can be released again to ensure that the release position of the stent coincides with the target position. Therefore, the stent pushing system in the present application can adjust the release position of the stent multiple times, thereby achieving repeated positioning and recovery of the stent, thereby improving the implantation quality of the stent and reducing surgical risks. Therefore, the stent pushing system in the present application effectively solves the problem that the stent cannot be repeatedly positioned and recovered in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0026] Figure 1 A schematic structural diagram of a stent pushing system according to a specific embodiment of the utility model is shown;

[0027] Figure 2 Shows Figure 1 A schematic diagram of the position relationship of the stent of the stent delivery system when the stent is located inside the sheath;

[0028] Figure 3 A schematic diagram showing the structure of the stent pushing system of the present application when it does not have a loader;

[0029] Figure 4 Shows Figure 3 A schematic diagram of the position relationship of the stent of the stent delivery system when the stent enters the sheath;

[0030] Figure 5 A schematic structural diagram of a stent pushing system in another specific embodiment of the present application is shown;

[0031] Figure 6 Shows Figure 5 Schematic diagram of the positional relationship of the stent in the stent delivery system when the stent is separated from the sheath.

[0032] The above drawings include the following reference numerals:

[0033] 10. Sheath; 20. Pushing member; 21. Claw structure; 211. Movable arm; 212. Transport arm; 22. Steel cable; 30. Bracket; 40. Loader; 41. First hole section; 42. Second hole section; 43. Step surface; 44. Main body; 45. Connecting part. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0036] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0037] In order to solve the problem in the prior art that stents cannot be repeatedly positioned and recovered, the present application provides a stent pushing system.

[0038] like Figures 1 to 6 As shown, the stent pushing system in the present application includes a sheath tube 10, a pushing member 20 and a stent 30. At least a portion of the pushing member 20 is movably arranged inside the sheath tube 10, one end of the pushing member 20 can extend or retract into the sheath tube 10, and the portion of the pushing member 20 extending out of the sheath tube 10 has a claw structure 21; the claw structure 21 can pick up or put down the stent 30, and the stent 30 is a deformable structure, and when the stent 30 enters the sheath tube 10 together with the pushing member 20, at least a portion of the stent 30 shrinks.

[0039] When using the stent push system in the present application, since there are the sheath 10 and the push member 20, the movement of the stent 30 can be achieved through the cooperation between the sheath 10 and the push member 20. In the present application, when the stent 30 needs to be released, the push member 20 and the stent 30 are both located inside the sheath 10, and the sheath 10 is withdrawn after the sheath 10 moves to the target position. At this time, the push member 20 and the stent 30 move relative to the sheath 10 and extend out of the sheath 10, and as the sheath 10 is withdrawn, the stent 30 can be completely separated from the sheath 10, thereby completing the release of the stent 30. After the stent 30 is released, the position of the stent 30 can be judged. If there is an error between the position of the stent 30 and the target position, the stent 30 can be picked up by the claw structure 21 of the push member 20, and the stent 30 can be driven to move together by the claw structure 21. Since the stent 30 is a deformable structure, the stent 30 can be deformed in the process of entering the inside of the sheath 10 together with the push member 20 to adapt to the size of the sheath 10, thereby ensuring that the stent 30 smoothly enters the inside of the sheath 10. After the stent 30 returns to the inside of the sheath 10, the sheath 10 can be driven to move again, and the stent 30 can be released again to ensure that the release position of the stent 30 coincides with the target position. Therefore, the stent push system in the present application can adjust the release position of the stent 30 multiple times, thereby achieving repeated positioning and recovery of the stent 30, thereby improving the implantation quality of the stent 30 and reducing the surgical risk. Therefore, the stent push system in the present application effectively solves the problem that the stent cannot be repeatedly positioned and recovered in the prior art.

[0040] Furthermore, it should be noted that in the present application, the sheath tube 10 and the pushing member 20 mainly play the role of pushing and adjusting the position of the stent 30 .

[0041] like Figures 1 to 4 As shown, in a specific embodiment of the present application, the pusher 20 includes a steel cable 22, and at least a part of the claw structure 21 is movably arranged on the steel cable 22. When the claw structure 21 picks up the bracket 30, the claw structure 21 abuts against the outer wall of the bracket 30. That is, in this embodiment, the claw structure 21 grabs the outside of the bracket 30, so as to pick up the bracket 30. In addition, in this embodiment, the claw structure 21 includes at least two movable arms 211, one end of the movable arm 211 is connected to the steel cable 22, and the other end of the movable arm 211 can move relative to the steel cable 22 to change the angle between the movable arm 211 and the steel cable 22. That is, in this embodiment, when the claw structure 21 is completely extended out of the sheath tube 10 along with the steel cable 22, the angle between the movable arm 211 and the steel cable 22 is the largest, so that the bracket 30 can be picked up to bring the bracket 30 into the inside of the sheath tube 10. When the claw structure 21 is completely located inside the sheath tube 10 , the angle between the movable arm 211 and the steel cable 22 is the smallest.

[0042] Furthermore, in the present application, when there are multiple movable arms 211, the multiple movable arms 211 are arranged at intervals around the circumference of the steel cable 22. Preferably, the multiple movable arms 211 are arranged at equal intervals around the circumference of the steel cable 22. Furthermore, in the present application, the purpose of setting at least two movable arms 211 is to achieve stable picking up of the bracket 30 by the claw structure 21. Therefore, when there are two movable arms 211, the installation positions of the two movable arms 211 on the steel cable 22 are arranged 180 degrees apart.

[0043] Meanwhile, in this embodiment, the claw structure 21 may not be arranged at the end of the steel cable 22 extending out of the sheath tube 10. When the claw structure 21 is used to pick up the bracket 30, one end of the steel cable 22 may pass through the bracket 30, thereby further limiting the bracket 30, so that after the claw structure 21 picks up the bracket 30, relative displacement occurs between the bracket 30 and the claw structure 21 or between the bracket 30 and the steel cable 22, thereby ensuring the use effect of the bracket pushing system in the present application.

[0044] Of course, after the claw structure 21 picks up the bracket 30, in order to further prevent relative displacement between the bracket 30 and the claw structure 21 or between the bracket 30 and the steel cable 22, a mutually matching threaded structure can be set between the inside of the bracket 30 and the steel cable 22, and the steel cable 22 and the bracket 30 can be locked by rotating the steel cable 22 relative to the bracket 30, and at this time, the claw structure 21 can no longer be set on the steel cable 22, but only the threaded matching between the steel cable 22 and the bracket 30 can be used to adjust the position of the bracket 30. On the other hand, if the mutually matching threaded structure is not set in the present application, the structure of the bracket 30 can be effectively simplified, thereby reducing the risk of thrombosis. Therefore, in the present application, the bracket 30 is mainly picked up and released by the claw structure 21.

[0045] Of course, in the present application, the connection relationship between the steel cable 22 and the bracket 30 can also be switched through an external control component, thereby achieving the release and connection between the bracket 30 and the steel cable 22.

[0046] Optionally, one end of the movable arm 211 that cooperates with the bracket 30 has a spherical protrusion.

[0047] Optionally, one end of the movable arm 211 that cooperates with the bracket 30 has a curved surface.

[0048] In a specific embodiment of the present application, one end of the movable arm 211 of the claw structure 21 used to pick up the bracket 30 is rounded, and the rounded end is formed by laser spot welding. The purpose of this arrangement is to ensure that the surface of the end of the movable arm 211 used to pick up the bracket 30 is smoother, so as to ensure that the bracket 30 can be stably picked up while reducing damage to the bracket 30, so as to ensure the performance and service life of the bracket 30. Therefore, the purpose of setting a spherical protrusion or an arc surface at the end of the movable arm 211 that cooperates with the bracket 30 is to avoid the occurrence of sharp corners at the end of the movable arm 211 that cooperates with the bracket 30.

[0049] In this embodiment, the movable arm 211 includes a connecting section and a clamping section connected in sequence, and the movable arm 211 is connected to the steel cable 22 through the connecting section. In the present application, it can be arranged that the clamping section can move relative to the steel cable 22, while the connecting section is fixedly connected to the steel cable 22. Preferably, the connecting section and the steel cable 22 are parallel to each other. By such an arrangement, when the claw structure 21 is completely located inside the sheath 10, the angle between the movable arm 211 and the steel cable 22 bracket 30 can be minimized, and the clamping effect on the bracket 30 is ensured to prevent relative displacement between the bracket 30 and the claw structure 21.

[0050] like Figure 1 and Figure 2 As shown, in a specific embodiment of the present application, the stent pushing system further includes a loader 40, which is disposed at one end of the sheath 10, and the pushing member 20 can pass through the loader 40 and extend out of the sheath 10, and the opening area of ​​the end of the loader 40 away from the sheath 10 is larger than the opening area of ​​the end of the loader 40 close to the sheath 10. In addition, the interior of the loader 40 has a first hole section 41 and a second hole section 42 that are interconnected, and the end of the first hole section 41 away from the second hole section 42 is connected to the sheath 10, and the opening areas of the first hole section 41 and the second hole section 42 are gradually increased in the direction away from the sheath 10.

[0051] Optionally, the loader 40 is trumpet-shaped. Furthermore, the first hole section 41 and the second hole section 42 are both arranged inside the trumpet. Meanwhile, in the present application, the internal spaces of the first hole section 41 and the second hole section 42 are both truncated cone-shaped.

[0052] In this embodiment, a step surface 43 is provided at the connection between the first hole segment 41 and the second hole segment 42, and an opening diameter of an end of the first hole segment 41 close to the second hole segment 42 is larger than an opening diameter of an end of the second hole segment 42 close to the first hole segment 41, and an opening diameter of an end of the second hole segment 42 away from the first hole segment 41 is larger than an opening diameter of an end of the first hole segment 41 close to the second hole segment 42.

[0053] Specifically, the distance from the inner wall of the end of the second hole section 42 away from the first hole section 41 to the axis of the steel cable 22 is greater than the distance from the end of the movable arm 211 that cooperates with the bracket 30 to the axis of the steel cable 22 when the angle between the movable arm 211 and the steel cable 22 reaches the maximum.

[0054] Specifically, the distance from the inner wall of one end of the second hole section 42 close to the first hole section 41 to the axis of the steel cable 22 is smaller than the distance from the end of the movable arm 211 that cooperates with the bracket 30 to the axis of the steel cable 22 when the angle between the movable arm 211 and the steel cable 22 reaches the maximum.

[0055] Specifically, the radius of the end of the second hole section 42 close to the first hole section 41 is larger than the radius of the stent 30 when it is not contracted. In addition, the sheath tube 10, the steel cable 22, the first hole section 41, and the second hole section 42 are coaxially arranged.

[0056] By such arrangement, in the process of recovering the stent 30, since the radius of the end of the second hole section 42 close to the first hole section 41 is larger than the radius of the stent 30 when it is not contracted, it can be ensured that the stent 30 can smoothly enter the first hole section 41 from the second hole section 42. By setting the connection between the first hole section 41 and the second hole section 42 with a step surface 43, and the opening diameter of the end of the first hole section 41 close to the second hole section 42 is larger than the opening diameter of the end of the second hole section 42 close to the first hole section 41, it can be ensured that after the claw structure 21 enters the first hole section 41 from the second hole section 42, the claw structure 21 is limited by the step surface 43, and it can also be ensured that after the stent 30 enters the first hole section 41, as the claw structure 21 and the stent 30 continue to move, the inner wall of the first hole section 41 can continuously squeeze the claw structure 21 and the stent 30, thereby ensuring that the claw structure 21 and the stent 30 can smoothly enter the interior of the sheath tube 10.

[0057] It should be noted that in the present application, the opening diameter at the step surface 43 is only slightly smaller than the diameter of the claw structure 21 when the movable arm 211 is fully extended, or the diameter of the second hole section 42 near the first hole section 41 is slightly smaller than the diameter of the claw structure 21 when the movable arm 211 is fully extended. In this way, not only can the step surface 43 be used to limit the claw structure 21, but also because the end of the movable arm 211 does not have a sharp corner but an arc surface, in the process of pulling the sheath tube 10 and extending the steel cable 22 out of the sheath tube 10, the claw structure 21 can be squeezed and slide out of the step surface 43, so as to extend out of the sheath tube 10 together with the steel cable 22.

[0058] Optionally, the loader 40 includes a body portion 44 and a connecting portion 45, the body portion 44 has a first hole segment 41 and a second hole segment 42, the loader 40 is sleeved on the sheath tube 10 through the connecting portion 45, and the radius of the end of the first hole segment 41 away from the second hole segment 42 is the same as the radius of the end of the sheath tube 10 close to the loader 40. By such an arrangement, the stability of the connection between the loader 40 and the sheath tube 10 can be effectively ensured.

[0059] like Figure 5 and Figure 6 As shown, in a specific embodiment of the present application, the pusher 20 includes a steel cable 22, and at least a portion of the claw structure 21 is movably arranged at one end of the steel cable 22 extending out of the sheath 10. When the claw structure 21 picks up the bracket 30, the claw structure 21 extends into the inside of the bracket 30. In addition, the claw structure 21 includes at least two conveying arms 212, which are connected to the steel cable 22. One end of the conveying arm 212 that cooperates with the bracket 30 is arc-shaped, and the center of the arc is located on the side of the conveying arm 212 away from the steel cable 22. It should be noted that in this embodiment, the conveying arm 212 can be set to a form that can move relative to the steel cable 22, so as to ensure that the claw structure 21 can pick up and release the bracket 30 more smoothly.

[0060] In this embodiment, the claw structure 21 is arranged at the end of the steel cable 22, and the claw structure 21 has a certain length in the length direction of the steel cable 22. And the multiple conveying arms 212 of the claw structure 21 gradually expand outward along the extension direction of the claw structure 21, and the ends of the conveying arms 212 are turned outward. By such a configuration, it can be ensured that after the conveying arms 212 penetrate into the interior of the stent 30, since the ends of the conveying arms 212 are turned outward, they can be stuck with the interior of the stent through the ends of the conveying arms 212, thereby ensuring that the claw structure 21 can drive the stent 30 to move together. In addition, in the process of the claw structure 21 entering the interior of the sheath tube 10, the conveying arms 212 are squeezed, so the distance between the multiple conveying arms 212 gradually decreases, or the multiple conveying arms 212 gradually close together, so that the multiple conveying arms 212 can drive the stent 30 to deform, and then the stent 30 gradually shrinks, so as to ensure that the stent 30 can smoothly enter the interior of the sheath tube 10.

[0061] In this embodiment, when the sheath tube 10 is driven to move relative to the steel cable 22, the claw structure 21 and the bracket 30, and the steel cable 22, the claw structure 21 and the bracket 30 are extended out of the sheath tube 10, as the bracket 30 gradually extends out of the sheath tube 10, the bracket 30 will gradually deform, and then the diameter of the bracket 30 will gradually increase. In the process of the bracket 30 deforming, the bracket 30 and the conveying arm 212 of the claw structure 21 are gradually disconnected. Then, when the bracket 30 is completely extended out of the sheath tube 10, the conveying arm 212 of the claw structure 21 is not completely extended out of the sheath tube 10, so the bracket 30 and the conveying arm 212 of the claw structure 21 can be completely disconnected to achieve the purpose of releasing the bracket 30.

[0062] It should be added that, in this embodiment, a loader can also be provided at the end of the sheath tube according to actual usage requirements.

[0063] Therefore, in the present application, by providing different forms of the claw structures 21 , the bracket 30 can be picked up and released from the inside and the outside of the bracket 30 respectively.

[0064] In the present application, the opening of the end of the sheath tube 10 for the pusher 20 to extend is in a trumpet shape. This arrangement can ensure that the bracket 30 can enter the interior of the sheath tube 10 more easily, so that the bracket 30 can be squeezed by the sheath tube 10 and the claw structure 21. In addition, at least one end of the bracket 30 that cooperates with the claw structure 21 has an arc surface. This arrangement can effectively prevent the bracket 30 from getting stuck with the end of the sheath tube 10 during the process of entering the sheath tube 10, thereby ensuring that the bracket 30 enters the sheath tube 10 more smoothly.

[0065] Furthermore, in the present application, one end of the sheath 10 for extending the push member 20 may be provided with a flexible material, such as silicone or soft PEBAX, etc., so as to reduce the resistance of the claw structure 21 and the stent 30 when entering the sheath 10, making the recovery process of the stent 30 smoother.

[0066] From the above description, it can be seen that the above-mentioned embodiment of the utility model achieves the following technical effects: when using the stent push system in the present application, since there are the sheath tube 10 and the push member 20, the movement of the stent 30 can be achieved through the mutual cooperation of the sheath tube 10 and the push member 20. In the present application, when the stent 30 needs to be released, the push member 20 and the stent 30 are both located inside the sheath tube 10, and the sheath tube 10 is retracted after the sheath tube 10 moves to the target position. At this time, the push member 20 and the stent 30 move relative to the sheath tube 10 and extend out of the sheath tube 10, and as the sheath tube 10 is retracted, the stent 30 can be completely separated from the sheath tube 10, thereby completing the release of the stent 30. After the stent 30 is released, the position of the stent 30 can be judged. If there is an error between the position of the stent 30 and the target position, the stent 30 can be picked up by the claw structure 21 of the push member 20, and the stent 30 can be driven to move together by the claw structure 21. Since the stent 30 is a deformable structure, the stent 30 can be deformed in the process of entering the inside of the sheath 10 together with the push member 20 to adapt to the size of the sheath 10, thereby ensuring that the stent 30 smoothly enters the inside of the sheath 10. After the stent 30 returns to the inside of the sheath 10, the sheath 10 can be driven to move again, and the stent 30 can be released again to ensure that the release position of the stent 30 coincides with the target position. Therefore, the stent push system in the present application can adjust the release position of the stent 30 multiple times, thereby achieving repeated positioning and recovery of the stent 30, thereby improving the implantation quality of the stent 30 and reducing the surgical risk. Therefore, the stent push system in the present application effectively solves the problem that the stent cannot be repeatedly positioned and recovered in the prior art.

[0067] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0068] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0069] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0070] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A stent pushing system, characterized in that: include: Sheath (10); A pushing member (20), at least a portion of which is movably disposed inside the sheath tube (10), one end of which can extend out of or retract into the sheath tube (10), and a portion of the pushing member (20) extending out of the sheath tube (10) having a claw structure (21); A bracket (30), wherein the claw structure (21) is capable of picking up or putting down the bracket (30), and the bracket (30) is a deformable structure, and when the bracket (30) enters the sheath tube (10) together with the pushing member (20), at least a portion of the bracket (30) contracts; A loader (40), wherein the loader (40) is arranged at one end of the sheath tube (10), the pushing member (20) can pass through the loader (40) and extend out of the sheath tube (10), and the opening area of ​​the end of the loader (40) away from the sheath tube (10) is larger than the opening area of ​​the end of the loader (40) close to the sheath tube (10).

2. The stent pushing system according to claim 1, characterized in that: The pushing member (20) comprises a steel cable (22), and at least a part of the claw structure (21) is movably arranged on the steel cable (22). When the claw structure (21) picks up the bracket (30), the claw structure (21) abuts against the outer side wall of the bracket (30).

3. The stent pushing system according to claim 2, characterized in that: The claw structure (21) comprises at least two movable arms (211), one end of the movable arm (211) is connected to the steel cable (22), and the other end of the movable arm (211) can move relative to the steel cable (22) to change the angle between the movable arm (211) and the steel cable (22).

4. The stent pushing system according to claim 3, characterized in that: One end of the movable arm (211) that cooperates with the bracket (30) has a spherical protrusion; or One end of the movable arm (211) that cooperates with the bracket (30) has an arc-shaped surface.

5. The stent pushing system according to claim 3, characterized in that: The interior of the loader (40) comprises a first hole section (41) and a second hole section (42) which are connected to each other, and an end of the first hole section (41) away from the second hole section (42) is connected to the sheath tube (10), and the opening areas of the first hole section (41) and the second hole section (42) gradually increase in a direction away from the sheath tube (10).

6. The stent pushing system according to claim 5, characterized in that: A step surface (43) is provided at a connection point between the first hole section (41) and the second hole section (42), and an opening diameter of an end of the first hole section (41) close to the second hole section (42) is larger than an opening diameter of an end of the second hole section (42) close to the first hole section (41), and an opening diameter of an end of the second hole section (42) away from the first hole section (41) is larger than an opening diameter of an end of the first hole section (41) close to the second hole section (42).

7. The stent pushing system according to claim 5, characterized in that: The distance from the inner side wall of the end of the second hole section (42) away from the first hole section (41) to the axis of the steel cable (22) is greater than the distance from the end of the movable arm (211) that cooperates with the bracket (30) to the axis of the steel cable (22) when the angle between the movable arm (211) and the steel cable (22) reaches the maximum; and / or The distance from the inner side wall of the end of the second hole section (42) close to the first hole section (41) to the axis of the steel cable (22) is smaller than the distance from the end of the movable arm (211) that cooperates with the bracket (30) to the axis of the steel cable (22) when the angle between the movable arm (211) and the steel cable (22) reaches the maximum; and / or The radius of an end of the second hole segment (42) close to the first hole segment (41) is greater than the radius of the bracket (30) when it is not contracted.

8. The stent pushing system according to claim 5, characterized in that: The sheath tube (10), the steel cable (22), the first hole section (41), and the second hole section (42) are coaxially arranged.

9. The stent pushing system according to claim 5, characterized in that: The loader (40) comprises a main body (44) and a connecting portion (45), wherein the main body (44) has the first hole segment (41) and the second hole segment (42), and the loader (40) is sleeved on the sheath tube (10) via the connecting portion (45), and the radius of an end of the first hole segment (41) away from the second hole segment (42) is the same as the radius of an end of the sheath tube (10) close to the loader (40).

10. The stent pushing system according to any one of claims 1 to 9, characterized in that: The opening of one end of the sheath tube (10) through which the pushing member (20) extends is in a trumpet shape.

11. The stent pushing system according to any one of claims 1 to 9, characterized in that: At least one end of the bracket (30) that cooperates with the claw structure (21) has an arc-shaped surface.

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