Atrial septal defect occluder
An atrial septal defect occluder, including: a body ( 100, 510 ), including two disk surfaces arranged opposite to each other and provided with a through hole ( 130 ) along an axial direction of the body ( 100, 510 ); and a blocking assembly, including an openable choke film ( 200 ) or elastic body ( 520 ), the blocking assembly being in contact with the body ( 100, 510 ), wherein when the blocking assembly is in a closed state, the blocking assembly impedes liquid from flowing in the through hole ( 130 ), and when the blocking assembly is in an open state, the blocking effect is weakened or even eliminated, thus allowing a minimally invasive interventional device to pass through the occluder by means of the through hole ( 130 ). By means of the interaction between the through hole ( 130 ) in the body ( 100, 510 ) and the blocking assembly of the occluder, the occluder may not only seal an atrial septal defect, but may also achieve the function of allowing a minimally invasive interventional device to pass by means of the through hole ( 130 ) when necessary, thus preventing repeated perforation treatments.
1 . An atrial septal defect occluder, comprising:
a body, comprising two disk surfaces arranged opposite to each other and provided with a through hole along an axial direction of the body, wherein the two disk surfaces comprise a left heart disk surface and a right heart disk surface; and
a blocking mechanism, comprising an openable choke film, the blocking mechanism being in contact with the body,
wherein when the blocking mechanism is in a closed state, the blocking mechanism impedes liquid from flowing in the through hole, and when the blocking mechanism is in an open state, a blocking effect is weakened or even eliminated, thus allowing a minimally invasive interventional device to pass through the occluder by means of the through hole;
wherein the blocking mechanism comprises a choke film disposed on the left heart disk surface, wherein a portion of a periphery of the choke film is fixed to the left heart disk surface and wherein the choke film is configured such that when pressure of a right atrium is higher than that of a left atrium, the choke film is no longer tightly attached to the left heart disk surface, creating a space so that blood in the right atrium can flow to the left atrium through the opening, thereby reducing pressure in the right atrium; and further wherein, when the minimally invasive device needs to enter the left atrium, the choke film on the left heart disk surface can be slightly lifted, and the minimally invasive device can pass through the opening;
wherein the body and the choke film are constructed using a braided nickel-titanium alloy wire;
wherein a tail end of the braided wire is laterally eccentric relative to the through hole and is attached to a stainless steel nut sleeve on one of the disk surfaces, wherein the stainless steel nut sleeve is configured to strengthen, support, and help maintain the shape of the through hole;
wherein the braided wire forms a mesh structure;
wherein the choke films comprises pores on a surface of the choke film, the pores being filled with polytetrafluoroethylene or polyurethane.