Left atrial appendage occluder and left atrial appendage occlusion system

A left atrial appendage occluder, comprising an occluding stent, a proximal securing member and a distal securing member,

• the occluding stent comprising an occlusion structure and a traction structure, the occlusion structure having a first proximal end and a first distal end opposing the first proximal end, the proximal securing member disposed at the first proximal end and configured to form a closed configuration at the first proximal end, the first distal end configured in an open configuration, the traction structure attached to the occlusion structure and at least partially overlapped with the occlusion structure along an axial direction, the traction structure comprising a plurality of traction elements each having a first end connected to the distal securing member and a second end connected to the occlusion structure, wherein movement of the distal securing member toward the proximal securing member is able to cause the occluding stent to transition from an expanded configuration to a collapsed configuration.