Atrial septum and diverter capable of automatically adjusting size of channel

The invention discloses an atrial septum diverter capable of automatically adjusting channel size, which comprises a waist part, two ends of the waist part are respectively connected with a right atrial entrance and a left atrial entrance, the waist part comprises a nickel-titanium alloy frame, a flow blocking film is attached on the nickel-titanium alloy frame, and an elastic retraction material layer is arranged on the inner wall of the waist part and extends from the right atrial entrance to the middle part of the waist part. An anticoagulation coating is arranged on the surface of the elastic retraction material layer; and one end of the elastic retraction material layer in the middle position in the waist part is an opening which can be opened and closed and is adjustable in size. According to the atrial septum shunt, the size of the open channel of the atrial septum shunt can be adjusted according to the pressure of the left atrium and the right atrium, and the shunt volume can be adjusted according to