Left atrial appendage occluder

Abstract

The present invention provides a left atrial appendage occluder, comprising: a fixing disk, the fixing disk having a first connection structure, the first connection structure having a first threaded section; an occlusion disk, the occlusion disk having a second connection structure, the second connection structure having a second threaded section, both the first threaded section and the second threaded section having a thread structure and being threadedly engaged with each other, the occlusion disk further having a conveying thread for threadedly cooperating with a conveying steel cable, the rotation direction when tightening the thread structure being opposite to the rotation direction when tightening the conveying thread, the first connection structure and / or the second connection structure further including a moving section, after the first threaded section and the second threaded section are threadedly tightened to a preset distance, the first threaded section disengages from the second threaded section, and the second threaded section or the first threaded section cooperates with the moving section, and the fixing disk and the occlusion disk can axially move a predetermined distance along the moving section. The present invention solves the problem that the left atrial appendage occluder in the prior art is prone to loosening when connected and cooperated with the conveying steel cable.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more particularly, to a left atrial appendage occluder. Background Art

[0002] At present, all left atrial appendage occluders on the market are mostly single-body inner plugs made of metal pipes formed by laser cutting and then heat treatment, or made of metal wires formed by braiding and then heat treatment, or left atrial appendage occluder brackets composed of different types of cutting brackets welded in the middle. The connection parts in the middle are all laser-welded, which is a non-movable connection method. The implant is connected to the delivery system by a screw thread. At present, all the connection methods used for the occluding disc and the fixing disc of left atrial appendage occluders on the market are laser-welded, and all are non-detachable and non-adjustable design structures.

[0003] The common structures of left atrial appendage occluders are plug type and double-disc type. The double-disc type left atrial appendage occluder is composed of a sealing device and a fixing device, and usually has the advantage of being recyclable and releasable repeatedly. However, it has the following defects:

[0004] (1) At present, all left atrial appendage occluders on the market are divided into single-body inner plugs and inner plug outer covers. The structure of the single-body inner plug has the defects that it cannot effectively occlude the orifice of the left atrial appendage during the clinical process, there is residual leakage, and it is easy to form a residual cavity that is not easy to endothelialize.

[0005] (2) The defect of the inner plug outer cover left atrial appendage occluder structure is that during the clinical process, due to the irregularity of the left atrial appendage, after the outer cover of the left atrial appendage occluder is implanted, because the specifications are not completely suitable, if the occluding disc is too large, it will cause abrasion of the pulmonary vein and mitral valve, and if the occluding disc is too small, it will form a residual cavity that is not easy to endothelialize.

[0006] (3) The product structures of left atrial appendage occluders are all non-separable or freely assembled product structures, and it is impossible to select a suitable left atrial appendage product for patients according to the actual clinical needs.

[0007] (4) The heights of left atrial appendage products are all of the same height, which has requirements for the depth of the left atrial appendage.

[0008] To address the defects of the above-mentioned left atrial appendage occluder, there is an improved related technology of the left atrial appendage occluder, including an anchoring portion, a connecting portion, and a covering portion. The connecting portion is composed of a threaded connector, a hollow limiting member, and a clamping element. Although this improved structure realizes the detachable connection between the anchoring portion and the covering portion, it brings new problems and obvious defects: When the connection is required during the operation of implanting the left atrial appendage occluder into the heart, the connection method between the occluder and the delivery cable is a threaded connection. The nut is tightened by rotating the thread in the forward direction and loosened by rotating the nut in the reverse direction. This design not only has a complex structure but also causes the middle threaded connection to become loose as the delivery cable rotates during the release and detachment of the product, bringing a serious risk of loosening of the occluding disc and the fixing disc nut. Since the heart is in a diastolic state, once the two become loose, it is extremely difficult to locate and tighten them again under imaging. Moreover, the angle of the spherical adjustable occluding disc in the middle connection part, when encountering an irregular left atrial appendage structure, the cover-type occluding disc will have a situation where one side is not completely occluded, resulting in the risk of residual leakage, that is, incomplete occlusion, and it is easy to generate a thrombus cavity. Summary of the Invention

[0009] The main object of the present invention is to provide a left atrial appendage occluder to solve the problem that the existing left atrial appendage occluder is prone to loosening when connected and cooperated with the delivery cable.

[0010] To achieve the above object, according to one aspect of the present invention, there is provided a left atrial appendage occluder, including: a fixing disc, the fixing disc having a first connection structure, the first connection structure having a first threaded section; an occluding disc, the occluding disc having a second connection structure, the second connection structure having a second threaded section, both the first threaded section and the second threaded section having a threaded structure and the two being threadedly engaged. The occluding disc further has a delivery thread for threadedly cooperating with the delivery cable. The rotation direction when tightening the threaded structure is opposite to the rotation direction when tightening the delivery thread. The first connection structure and / or the second connection structure further includes a moving section. After the first threaded section and the second threaded section are threadedly tightened to a preset distance, the first threaded section and the second threaded section are disengaged from engagement, and the second threaded section or the first threaded section cooperates with the moving section, and the fixing disc and the occluding disc can axially move a predetermined distance along the moving section.

[0011] Further, the rotation direction of the threaded structure is left-handed.

[0012] Further, the first connection structure has a first moving section as the moving section, the first moving section is connected to the first threaded section, and the first moving section is farther from the occluding disc than the first threaded section; and / or the second connection structure has a second moving section as the moving section, the second moving section is connected to the second threaded section, and the second moving section is farther from the fixing disc than the second threaded section.

[0013] Further, the plugging disc further includes a plugging disc body. The second connection structure includes a large-diameter section and a small-diameter section that are axially connected in sequence. The large-diameter section is connected to the plugging disc body. The small-diameter section includes a second threaded section and a second moving section, and the second moving section is located between the second threaded section and the large-diameter section.

[0014] Further, the fixing disc further includes a fixing disc body. The first connection structure has a sleeve structure, and the inner wall surface of the sleeve structure includes a first threaded section and a first moving section.

[0015] Further, the first connection structure has a first moving section as the moving section. The first threaded section is an internal thread, and the inner diameter of the first moving section is greater than or equal to the maximum diameter of the threaded structure of the first threaded section; and / or the second connection structure has a second moving section as the moving section. The second threaded section is an external thread, and the outer diameter of the second moving section is less than or equal to the minimum diameter of the threaded structure of the second threaded section.

[0016] Further, the predetermined distance is 2 mm - 6 mm.

[0017] Further, the left atrial appendage occluder further includes an anti-rotation structure. The anti-rotation structure includes an anti-rotation protrusion and an anti-rotation groove. One of the anti-rotation protrusion and the anti-rotation groove is provided on the first connection structure, and the other is provided on the second connection structure. The anti-rotation protrusion is located on the moving section, and at least a part of the anti-rotation groove is located at the threaded structure. After the first threaded section and the second threaded section are disengaged from meshing, the anti-rotation protrusion extends into the anti-rotation groove and hinders the relative rotation between the fixing disc and the plugging disc.

[0018] Further, the first connection structure has a sleeve structure. The first threaded section is located at one end of the two ends of the sleeve structure close to the plugging disc. The anti-rotation groove extends from the first threaded section in a direction away from the plugging disc and communicates with the end face of the sleeve structure. The second connection structure has a second threaded section and a second moving section as the moving section. The second threaded section is an external thread, and the anti-rotation protrusion is located at the second moving section.

[0019] Further, the anti-rotation protrusion is at least one, and when there are multiple anti-rotation protrusions, the anti-rotation protrusions are arranged at intervals along the circumferential direction of the moving section.

[0020] Further, the plugging disc has a trapezoidal structure in the unstretched state, and along the direction close to the fixing disc, the hypotenuse of the trapezoidal structure inclines towards the direction close to the axis of the plugging disc.

[0021] Further, the height of the trapezoidal structure is 2 mm - 6 mm, and the base angle of the trapezoidal structure is 70° - 85°.

[0022] By applying the technical solution of the present invention, the rotation direction of the thread structure on the first thread segment and the second thread segment is set to be opposite to the rotation direction of the delivery thread. In this way, when the delivery cable is used in conjunction with the occluding disk, even if the delivery cable and the occluding disk are rotated, due to the opposite rotation directions of the thread structure, the delivery cable can only change the thread matching relationship between the occluding disk and the fixed disk even if the occluding disk is driven to rotate. Therefore, the first thread segment and the second thread segment between the fixed disk and the occluding disk will not move in the direction of disengagement and separation, but will have a further tightening effect, thereby ensuring that the fixed disk and the occluding disk will not loosen, and ensuring the stability and safety of the left atrial appendage occluder during the operation. At the same time, the present embodiment is also provided with a moving section, which can provide an adjustable space for the axial distance between the fixed disk and the occluding disk after the two are connected together. Specifically, when the two are connected, the first thread segment and the second thread segment are threaded together, and then as the tightening continues, the first thread segment and the second thread segment will contact from one end to disengage from the other end. At this time, the disengagement is merely the withdrawal between the threaded structures, which will not affect the connection relationship between the fixed disk and the occluding disk. After the first thread segment and the second thread segment are disengaged, the axial position between the first connection structure and the second connection structure is no longer constrained by the threaded structure, and the two can move on the moving section, thereby adjusting the distance between the fixed disk and the occluding disk, so that the left atrial appendage occluder can be automatically adjusted according to the size of the left atrial appendage, and can be suitable for the sizes of left atrial appendages of different depths, with a wider applicability. In addition, since the fixing disk and the occluding disk of the present embodiment are connected by a threaded detachable connection, fixing disks and occluding disks of different specifications can be freely matched, so that fixing disks and occluding disks of different specifications can be adaptively selected to match the complex and irregular internal structures of the left atrial appendage, inconsistent sizes, etc., to form a more targeted left atrial appendage occluder. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a 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 of the present invention. In the drawings:

[0024] Figure 1 A schematic structural diagram of a left atrial appendage occluder of the present invention is shown;

[0025] Figure 2 Shows Figure 1 A schematic diagram of the structure of the fixed disk in FIG.

[0026] Figure 3 Shows Figure 1 A schematic diagram of the structure of the blocking disk;

[0027] Figure 4shows Figure 3 an enlarged view of the position P in

[0028] Figure 5 a schematic structural diagram of the first connection structure;

[0029] Figure 6 shows Figure 5 a side view of

[0030] Figure 7 a schematic structural diagram of the second connection structure;

[0031] Figure 8 shows Figure 7 a side view of

[0032] Figure 9 a schematic structural diagram of the cooperation between the first connection structure and the second connection structure;

[0033] Figure 10 shows Figure 9 a schematic structural diagram from another perspective.

[0034] Among them, the above-mentioned drawings include the following reference numerals:

[0035] 10, fixed disk; 11, first connection structure; 111, first threaded section; 112, first moving section; 12, fixed disk body; 20, plugging disk; 21, second connection structure; 211, second threaded section; 212, second moving section; 213, large-diameter section; 214, small-diameter section; 22, plugging disk body; 30, anti-rotation structure; 31, anti-rotation protrusion; 32, anti-rotation groove. Detailed implementation manners

[0036] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0037] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0038] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are usually in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction of the component itself; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contour of each component itself, but the above orientation terms do not limit the present invention.

[0039] To solve the problem that the existing left atrial appendage occluder is prone to looseness when connected and cooperated with the delivery steel cable, the present invention provides a left atrial appendage occluder.

[0040] As Figures 1 to 10 shown, a left atrial appendage occluder includes a fixing plate 10 and an occluding plate 20. The fixing plate 10 has a first connecting structure 11, and the first connecting structure 11 has a first threaded section 111; the occluding plate 20 has a second connecting structure 21, and the second connecting structure 21 has a second threaded section 211. Both the first threaded section 111 and the second threaded section 211 have thread structures and are thread-engaged with each other. The occluding plate 20 also has a delivery thread for thread cooperation with the delivery steel cable. The rotation direction when tightening the thread structure is opposite to the rotation direction when tightening the delivery thread. The first connecting structure 11 and / or the second connecting structure 21 further includes a moving section. After the first threaded section 111 and the second threaded section 211 are thread-tightened to a preset distance, the first threaded section 111 disengages from the second threaded section 211, and the second threaded section 211 or the first threaded section 111 cooperates with the moving section, and the fixing plate 10 and the occluding plate 20 can axially move a predetermined distance along the moving section.

[0041] In this embodiment, the helix directions of the thread structures on the first thread section 111 and the second thread section 211 are set to be opposite to the helix direction of the conveying thread. In this way, when the conveying cable is used in cooperation with the plugging disc 20, even if the conveying cable and the plugging disc 20 are rotated, due to the opposite helix directions of the thread structures, the conveying cable can only change the thread engagement relationship with the plugging disc 20. Even if the plugging disc 20 is driven to rotate, the connection relationship between the plugging disc 20 and the fixed disc 10 cannot be changed. This makes the first thread section 111 and the second thread section 211 between the fixed disc 10 and the plugging disc 20 not move in the direction of disengagement, but instead have an effect of further tightening, thereby ensuring that the fixed disc 10 and the plugging disc 20 will not become loose and ensuring the stability and safety of the left atrial appendage occluder during the operation. At the same time, this embodiment is also provided with a moving section. After the fixed disc 10 and the plugging disc 20 are connected together, the moving section can provide an adjustable space for the axial distance between the two. Specifically, when connecting the two, the first thread section 111 and the second thread section 211 are threadedly connected together. Then, as the tightening continues, the first thread section 111 and the second thread section 211 will move out from one end to the other end. At this time, the disengagement is only the withdrawal between the thread structures and will not affect the connection relationship between the fixed disc 10 and the plugging disc 20. After the first thread section 111 and the second thread section 211 are disengaged from meshing, the axial positions of the first connection structure 11 and the second connection structure 21 are no longer restricted by the thread structure, and the two can move on the moving section, thereby adjusting the distance between the fixed disc 10 and the plugging disc 20, enabling the left atrial appendage occluder to be automatically adjusted according to the size of the left atrial appendage and being applicable to the sizes of left atrial appendages with different depths, with a wider applicability. In addition, since the fixed disc 10 and the plugging disc 20 in this embodiment are detachably connected by threads, different specifications of the fixed disc 10 and the plugging disc 20 can be freely matched. Therefore, for different situations such as complex internal structures, irregular shapes, and inconsistent sizes of the left atrial appendage, different specifications of the fixed disc 10 and the plugging disc 20 can be adaptively selected for matching to form a more targeted left atrial appendage occluder.

[0042] Preferably, since the conveying cable generally uses the method of right - hand tightening and left - hand loosening, the helix direction of the conveying thread is right - hand, so the helix direction of the thread structure is left - hand. In this way, it not only conforms to the general usage habits but also can ensure the anti - loosening effect. Of course, when the conveying thread is left - hand, the helix direction of the thread structure can be adjusted to right - hand accordingly.

[0043] Such as Figures 5 to 10As shown, in this embodiment, moving segments are provided on both the first connection structure 11 and the second connection structure 21. Specifically, the first connection structure 11 has a first moving segment 112 as the moving segment, and the second connection structure 21 has a second moving segment 212 as the moving segment. Among them, the first moving segment 112 is connected to the first threaded segment 111, and the first moving segment 112 is farther from the plugging disc 20 than the first threaded segment 111. The second moving segment 212 is connected to the second threaded segment 211, and the second moving segment 212 is farther from the fixed disc 10 than the second threaded segment 211. In this way, when the first threaded segment 111 and the second threaded segment 211 are tightened to a certain extent and disengaged from meshing, the first moving segment 112 cooperates with the second threaded segment 211, and the second threaded segment 211 can axially move at the first moving segment 112. The second moving segment 212 is aligned and cooperates with the first threaded segment 111, and the first threaded segment 111 can axially move at the second moving segment 212, so as to realize the axially movable adjustment after the first connection structure 11 and the second connection structure 21 are connected together, and realize the position adjustment between the fixed disc 10 and the plugging disc 20.

[0044] In addition to the method of providing moving segments on both the first connection structure 11 and the second connection structure 21, moving segments can also be provided only on one of the first connection structure 11 and the second connection structure 21. Taking the second connection structure 21 as an example of having a moving segment, that is, the setting and cooperation method of the above-mentioned second moving segment 212, and there is no structure at the first moving segment 112 on the first connection structure 11. The second threaded segment 211 can pass through the first connection structure 11 and there is no longer a cooperation relationship with the first connection structure 11, and so on.

[0045] Such as Figure 3 、 Figure 4 、 Figure 7 and Figure 8As shown, the plugging disc 20 of this embodiment further includes a plugging disc body 22. The plugging disc body 22 is a net structure, and the ends of its filaments converge at one place. The second connection structure 21 includes a large-diameter section 213 and a small-diameter section 214 that are axially connected in sequence. Among them, one end of the large-diameter section 213 is connected to the end formed by the convergence of the filaments of the plugging disc body 22, the other end of the large-diameter section 213 is connected to the small-diameter section 214, and the small-diameter section 214 includes a second thread section 211 and a second moving section 212, and the second moving section 212 is located between the second thread section 211 and the large-diameter section 213. That is to say, along the axis of the second connection structure 21 are the large-diameter section 213, the second moving section 212, and the second thread section 211 in sequence. In this way, the first connection structure 11 can not only realize the connection with the plugging disc body 22 but also realize the connection with the fixed disc 10. At the same time, the positional relationship between the second moving section 212 and the second thread section 211 can ensure that when the first thread section 111 and the second thread section 211 are tightened and then separated, the first thread section 111 can cooperate with the moving section, ensuring the adjustable effect.

[0046] As Figure 2 , Figure 5 and Figure 6 shown, the fixed disc 10 of this embodiment further includes a fixed disc body 12. The fixed disc body 12 has a plurality of hook-shaped structures arranged circumferentially. One ends of the plurality of hook-shaped structures converge towards the middle to one place. The first connection structure 11 has a sleeve structure. One end of the sleeve structure is connected to the end where the hook-shaped structures converge. The hollow part of the sleeve structure is the space for the second connection structure 21 to extend into. The inner wall surface of the sleeve structure includes a first thread section 111 and a first moving section 112, and the first thread section 111 is located at the end of the sleeve structure far from the hook-shaped structures, that is, the first thread section 111 is located at one end of the two ends of the sleeve structure close to the plugging disc 20. The first thread section 111 does not cover the entire length of the sleeve structure, so there is a part of the inner wall surface without a thread structure, and the place where this part of the inner wall surface without a thread structure is located is the first moving section 112. In this way, during installation and connection, the second thread section 211 can be aligned with the hollow part of the sleeve structure and then extended into the hollow part to be threadedly engaged with the first thread section 111. As the two are continuously tightened, the distance that the second connection structure 21 extends into the first connection structure 11 also continuously increases. When the first thread section 111 and the second thread section 211 are separated, the first thread section 111 is located outside the second moving section 212, and the second thread section 211 is located inside the first moving section 112, realizing axial movement adjustment.

[0047] In this embodiment, the first threaded section 111 uses an internal thread, and the second threaded section 211 uses an external thread. To avoid interference between the first moving section 112 and the second threaded section 211, in this embodiment, the inner diameter of the first moving section 112 is greater than or equal to the maximum diameter of the threaded structure of the first threaded section 111. The maximum diameter of the threaded structure of the first threaded section 111 is also the maximum diameter of the threaded structure of the second threaded section 211. Therefore, the inner diameter of the first moving section 112 is greater than or equal to the maximum diameter of the threaded structure of the second threaded section 211. In this way, when the second threaded section 211 is located inside the first moving section 112, it can axially move freely and smoothly. Similarly, to avoid interference between the second moving section 212 and the first threaded section 111, in this embodiment, the outer diameter of the second moving section 212 is less than or equal to the minimum diameter of the threaded structure of the second threaded section 211. The minimum diameter of the threaded structure of the second threaded section 211 is also the minimum diameter of the threaded structure of the first threaded section 111. Therefore, the outer diameter of the second moving section 212 is less than or equal to the minimum diameter of the threaded structure of the first threaded section 111. In this way, when the first threaded section 111 is located inside the second moving section 212, it can axially move freely and smoothly.

[0048] Preferably, in this embodiment, the axially adjustable predetermined distance between the fixing plate 10 and the blocking plate 20 is set to be 2 mm - 6 mm, so that the adjustment range is more in line with the environment of the left atrial appendage.

[0049] It should be noted that the specific structures and setting methods of the above-mentioned first connection structure 11 and second connection structure 21 are not limited to the methods listed above in this embodiment, and they can all be adjusted as needed. For example, the structural forms of the above-mentioned first connection structure 11 and second connection structure 21 can be interchanged, etc.

[0050] In this embodiment, to ensure that the fixing plate 10 and the blocking plate 20 can only axially move during adjustment and avoid circumferential rotation between the two, the left atrial appendage occluder of this embodiment further includes an anti-rotation structure 30. Among them, the anti-rotation structure 30 includes an anti-rotation protrusion 31 and an anti-rotation groove 32. One of the anti-rotation protrusion 31 and the anti-rotation groove 32 is arranged on the first connection structure 11, and the other is arranged on the second connection structure 21. After the first threaded section 111 and the second threaded section 211 are disengaged from meshing, the anti-rotation protrusion 31 extends into the anti-rotation groove 32 and hinders the relative rotation between the fixing plate 10 and the blocking plate 20, so as to achieve the effect of preventing rotation between the fixing plate 10 and the blocking plate 20 through the cooperation between the anti-rotation protrusion 31 and the anti-rotation groove 32.

[0051] Specifically, since the part that can be axially adjusted mainly lies in the moving section, in this embodiment, the anti-rotation protrusion 31 is arranged on the moving section, and at least a part of the anti-rotation groove 32 is arranged at the threaded structure. Specifically, which part is arranged on the first connection structure 11 and which part is arranged on the second connection structure 21 can be adjusted accordingly according to actual needs. In this embodiment, the anti-rotation protrusion 31 is arranged on the second moving section 212 and the anti-rotation groove 32 is arranged on the first threaded section 111 as an example for illustration. Of course, the anti-rotation protrusion 31 can also be arranged on the first moving section 112 and the anti-rotation groove 32 can be arranged on the second threaded section 211, or both of the above two methods can be set at the same time, etc.

[0052] Specifically, the anti-rotation groove 32 is located at one end of the sleeve structure close to the sealing plate 20, that is, the anti-rotation groove 32 and the first threaded section 111 are located at the same end of the sleeve structure, as Figure 7 and Figure 8 shown. In this way, the inner wall surface of the sleeve structure can have a threaded structure as the first threaded section 111, and an anti-rotation groove 32 is opened at a position on the sleeve structure that is radially corresponding to the first threaded section 111. And in order to ensure that the anti-rotation protrusion 31 can extend into the anti-rotation groove 32 during axial movement, the anti-rotation groove 32 communicates with the end face of the sleeve structure. At the same time, the anti-rotation groove 32 can extend a certain distance in the direction away from the sealing plate 20, and even penetrate through both ends of the sleeve structure to avoid interference between the sleeve structure and the anti-rotation protrusion 31. Correspondingly, the anti-rotation protrusion 31 is located on the circumferential side of the second moving section 212 and protrudes radially. The shape of the anti-rotation protrusion 31 is adapted to the anti-rotation groove 32, so as to achieve the anti-rotation effect.

[0053] Considering that the anti-rotation protrusion 31 and the anti-rotation groove 32 may not be aligned yet after the first threaded section 111 and the second threaded section 211 are rotated and disengaged, in this embodiment, a certain distance is left between the anti-rotation protrusion 31 and the second threaded section 211. Since the predetermined axially adjustable distance between the fixed plate 10 and the sealing plate 20 is 2-6 mm, the axial interval between the anti-rotation protrusion 31 and the second threaded section 211 is correspondingly 2-6 mm. Thus, after the first threaded section 111 and the second threaded section 211 are disengaged from meshing, the sealing plate 20 can be rotated within a small range to adjust the relative positions of the anti-rotation protrusion 31 and the anti-rotation groove 32. When the anti-rotation protrusion 31 and the anti-rotation groove 32 are aligned, the anti-rotation protrusion 31 immediately extends into the anti-rotation groove 32 to achieve anti-rotation.

[0054] Optionally, the number of the rotation-preventing protrusions 31 and the rotation-preventing grooves 32 can be set as required, and the rotation-preventing protrusions 31 and the rotation-preventing grooves 32 can be arranged at intervals along the circumferential direction of the moving section. In this embodiment, only one rotation-preventing protrusion 31 and one rotation-preventing groove 32 are provided. Of course, two or more rotation-preventing protrusions 31 and two rotation-preventing grooves 32 can also be provided. Taking two as an example, the two rotation-preventing protrusions 31 are respectively located on the two circumferentially opposite sides of the second moving section 212. Correspondingly, the two rotation-preventing grooves 32 are located on the opposite sides of the sleeve structure, that is, the two rotation-preventing grooves 32 penetrate through the opposite sides of the sleeve along the radial direction of the sleeve structure, which can improve the rotation-preventing effect.

[0055] As Figure 1 and Figure 3 shown, in this embodiment, the blocking disc 20 has a trapezoidal structure in the unstretched state. More accurately, the cross-section of the blocking disc 20 passing through the center line is trapezoidal, and along the direction close to the fixed disc 10, the hypotenuse of the trapezoidal structure inclines towards the direction close to the axis of the blocking disc 20. In this way, with the trapezoidal design, problems generated during the implantation of the outer cover type occluder can be effectively avoided. For example, if the blocking disc is too small, residual leakage will occur and a residual cavity is likely to be formed and is not easy to endothelialize. If the blocking disc is too large, it will cause abrasion to the pulmonary vein and the mitral valve. Even if the size of the blocking disc can just match the shape of the left atrial appendage, the edge of the blocking disc is relatively thin, and the surrounding tissues will be continuously worn during the continuous systolic and diastolic cycles of the heart. Therefore, the blocking disc 20 with a trapezoidal design has higher deformation flexibility, can better fit the anatomical structures of different-shaped left atrial appendages, significantly improves the occluding effect, and greatly reduces the abrasion to the surrounding tissues such as the pulmonary vein and the mitral valve.

[0056] During the operation, the internal traction of the fixed disc 10 can make the blocking disc 20 become an elliptical spindle structure. With the development of the ablation and occlusion one-stop operation, the elastic mesh tube of the blocking disc 20 with a trapezoidal design can fit better with the orifice of the left atrial appendage during ablation. The outer disc of the blocking disc 20 is flatly attached to the orifice of the left atrial appendage, will not protrude from the orifice of the left atrial appendage, will not cause any impact on the left superior pulmonary vein and the mitral valve, and will not form new residual cavities and residual leakage.

[0057] Preferably, the height of the trapezoidal structure is 2 mm - 6 mm, and the base angle of the trapezoidal structure is 70° - 85°. The height and the base angle are in a proportional relationship, so that the shape of the blocking disc 20 can fit more tightly with the inner wall of the left atrial appendage.

[0058] It should be noted that the multiple in the above embodiments refers to at least two.

[0059] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0060] 1. The problem that the existing left atrial appendage occluder is prone to loosening when connected and cooperated with the delivery steel cable is solved;

[0061] 2. The cooperation between the delivery steel cable and the occluding disc will not change the connection relationship between the occluding disc and the fixing disc, ensuring that the fixing disc and the occluding disc will not loosen, and ensuring the stability and safety of the left atrial appendage occluder during the operation;

[0062] 3. The distance between the fixing disc and the occluding disc can be adjusted, so that the left atrial appendage occluder can be automatically adjusted according to the size of the left atrial appendage, and can be applicable to the sizes of left atrial appendages with different depths, with a wider applicability;

[0063] 4. Different specifications of fixing discs and occluding discs can be freely matched, so that for different situations such as complex internal structures, irregular shapes, and inconsistent sizes of the left atrial appendage, different specifications of fixing discs and occluding discs can be adaptively selected for matching to form a more targeted left atrial appendage occluder;

[0064] 5. The anti-rotation structure hinders the relative rotation between the fixing disc and the occluding disc, ensuring the effect of axial adjustment;

[0065] 6. The trapezoidal design is adopted, so that the outer disc of the occluding disc is flatly attached to the orifice of the left atrial appendage and will not protrude from the orifice of the left atrial appendage,

[0066] which will not cause any impact on the left superior pulmonary vein and the mitral valve, and will not form new residual cavities and residual leaks.

[0067] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[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 otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate 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 drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances 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 are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A left atrial appendage occluder, characterized in that, Comprising: A fixed disk (10), the fixed disk (10) having a first connection structure (11), the first connection structure (11) having a first threaded section (111); A plugging disk (20), the plugging disk (20) having a second connection structure (21), the second connection structure (21) having a second threaded section (211), the first threaded section (111) and the second threaded section (211) both having a threaded structure and being threadedly engaged with each other, the plugging disk (20) further having a conveying thread for threadedly cooperating with a conveying steel cable, the rotation direction when tightening the threaded structure being opposite to the rotation direction when tightening the conveying thread, the first connection structure (11) and / or the second connection structure (21) further including a moving section, after the first threaded section (111) and the second threaded section (211) are threadedly tightened to a preset distance, the first threaded section (111) disengages from the second threaded section (211), the second threaded section (211) or the first threaded section (111) cooperates with the moving section, and the fixed disk (10) and the plugging disk (20) can axially move a predetermined distance along the moving section.

2. The left atrial appendage occluder according to claim 1, characterized in that, The rotation direction of the threaded structure is left-handed.

3. The left atrial appendage occluder according to claim 1, wherein The first connection structure (11) has a first moving section (112) serving as the moving section, the first moving section (112) is connected to the first threaded section (111), and the first moving section (112) is farther from the plugging disk (20) than the first threaded section (111); and / or The second connection structure (21) has a second moving section (212) serving as the moving section, the second moving section (212) is connected to the second threaded section (211), and the second moving section (212) is farther from the fixed disk (10) than the second threaded section (211).

4. The left atrial appendage occluder according to claim 3, wherein The plugging disk (20) further includes a plugging disk body (22), the second connection structure (21) includes a large-diameter section (213) and a small-diameter section (214) connected in sequence axially, the large-diameter section (213) is connected to the plugging disk body (22), the small-diameter section (214) includes the second threaded section (211) and the second moving section (212), and the second moving section (212) is located between the second threaded section (211) and the large-diameter section (213).

5. The left atrial appendage occluder according to claim 3, characterized in that, The fixed disk (10) further includes a fixed disk body (12), the first connection structure (11) has a sleeve structure, and the inner wall surface of the sleeve structure includes the first threaded section (111) and the first moving section (112).

6. The left atrial appendage occluder according to claim 1, wherein The first connection structure (11) has a first moving section (112) serving as the moving section, the first threaded section (111) is an internal thread, and the inner diameter of the first moving section (112) is greater than or equal to the maximum diameter of the threaded structure of the first threaded section (111); and / or The second connecting structure (21) has a second moving segment (212) as the moving segment, the second threaded segment (211) is an external thread, and the outer diameter of the second moving segment (212) is less than or equal to the minimum diameter of the threaded structure of the second threaded segment (211).

7. The left atrial appendage occluder according to claim 1, characterized in that, The predetermined distance is 2 mm - 6 mm.

8. The left atrial appendage occluder according to claim 1, wherein The left atrial appendage occluder further includes an anti-rotation structure (30). The anti-rotation structure (30) includes an anti-rotation protrusion (31) and an anti-rotation groove (32). One of the anti-rotation protrusion (31) and the anti-rotation groove (32) is arranged on the first connecting structure (11), and the other is arranged on the second connecting structure (21). The anti-rotation protrusion (31) is located on the moving segment, and at least a part of the anti-rotation groove (32) is located at the threaded structure. After the first threaded segment (111) is disengaged from the second threaded segment (211), the anti-rotation protrusion (31) extends into the anti-rotation groove (32) and impedes the relative rotation between the fixing plate (10) and the occluding plate (20).

9. The left atrial appendage occluder according to claim 8, characterized in that, The first connecting structure (11) has a sleeve structure. The first threaded segment (111) is located at one end of the two ends of the sleeve structure close to the occluding plate (20). The anti-rotation groove (32) extends from the first threaded segment (111) in a direction away from the occluding plate (20) and communicates with the end face of the sleeve structure. The second connecting structure (21) has the second threaded segment (211) and a second moving segment (212) as the moving segment. The second threaded segment (211) is an external thread, and the anti-rotation protrusion (31) is located at the second moving segment (212).

10. The left atrial appendage occluder according to claim 8, characterized in that The anti-rotation protrusion (31) is at least one, and when there are multiple anti-rotation protrusions (31), the anti-rotation protrusions (31) are arranged at intervals along the circumferential direction of the moving segment.

11. The left atrial appendage occluder according to any one of claims 1 to 10, characterized in that, The occluding plate (20) has a trapezoidal structure in the unstretched state, and along the direction close to the fixing plate (10), the hypotenuse of the trapezoidal structure inclines towards the direction close to the axis of the occluding plate (20).

12. The left atrial appendage occluder according to claim 11, characterized in that, The height of the trapezoidal structure is 2 mm - 6 mm, and the base angle of the trapezoidal structure is 70° - 85°.

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