Left atrial appendage occluder

1. An improved left atrial appendage (LAA) occluder, comprising a sealing disc and an anchoring device, both of which are mutually connected;

the sealing disc comprising:

a disc surface provided with a first fixed end for connecting a transport device; and

a waist part extending from the disc surface, wherein the waist part is provided with:

a second fixed end connected to the anchoring device;

a diffusion section radiated outwards from the second fixed end; and

a body section extending between an outer periphery of the disc surface and an outer periphery of the diffusion section, wherein the body section has a top edge extending radially outward to directly connect with the outer periphery of the disc surface, and a bottom edge connected with the outer periphery of the diffusion section;

wherein the disc surface, the body section, and the diffusion section cooperate to define a cylindrical cavity within the waist part;

wherein at least two flow blocking membranes are arranged in the sealing disc, wherein one of the at least two flow blocking membranes is sutured in the disc surface and perpendicular to an axis of the LAA occluder extending from the first fixed end to the second fixed end, and the other one of the at least two flow blocking membranes is sutured to the waist part and received in the cavity, and perpendicular to the axis of the LAA occluder,

wherein the disc surface is configured to be positioned at an opening of an LAA and completely occlude, through the flow blocking membrane sutured in the disc surface, the opening of the LAA to prevent blood from flowing into the LAA;

wherein the waist part is configured to be received in a passage portion of the LAA communicating with the opening, to contact an inner wall of the passage portion, wherein the waist part is configured to further occlude, through the flow blocking membrane sutured within the cavity of the waist part, the passage portion of the LAA to further prevent blood from flowing into the LAA.

2. The improved LAA occluder according to claim 1 , wherein the bottom edge of the body section and the outer periphery of the diffusion section are in arc transition.

3. The improved LAA occluder according to claim 2 , wherein the other one of the at least two flow blocking membranes is located in the body section or on the diffusion section of the waist part.

4. The improved LAA occluder according to claim 2 , wherein the at least two flow blocking membranes comprise three flow blocking membranes, one flow blocking membrane is arranged in the disc surface, one flow blocking membrane is located in the body section of the waist part, and one flow blocking membrane is located on the diffusion section.

5. The improved LAA occluder according to claim 1 , wherein a part of the anchoring device cooperating with the LAA is an anchoring net, and the anchoring net is a backboneless structure.

6. The improved LAA occluder according to claim 5 , wherein the anchoring device has a structure rolled from interior to exterior, an inner edge part of the rolled structure is connected with the sealing disc, and a periphery part of the rolled structure is the anchoring net that is configured to cooperate with the LAA.

7. The improved LAA occluder according to claim 6 , wherein the anchoring device comprises a first end portion, a second end portion and a body between the first end portion and the second end portion, wherein the first end portion is gathered together and welded to form a center end, the body extends outwards from the first end portion to form a conical net, and then gradually reverses outwards and extends towards the first end portion to form the anchoring net surrounding the conical net, wherein the anchoring net defines a first opening at the second end portion, and the center end extends out of the first opening to connect with the second fixed end of the sealing disc;

wherein the anchoring device is configured to be released in the LAA, and the anchoring net is configured to cooperate with an inner wall of the LAA, and the anchoring net is of a backboneless structure;

wherein the sealing disc is configured to be released in a second opening of the LAA to occlude the second opening.

8. The improved LAA occluder according to claim 7 , wherein the body extends outwards from the first end portion to form the conical net, then gradually reverses outwards to form an arc transition area, and then extends towards the first end portion to form the anchoring net surrounding the conical net, wherein the arc transition area is connected between the conical net and the anchoring net.

9. The improved LAA occluder according to claim 8 , wherein the anchoring net is provided with multiple barbs, and when the anchoring net is in a tension compression state along the axis of the LAA occluder, the barbs are arranged on the inner side surface of the anchoring net.