Atrial septal stoma device

The utility model relates to the technical field of medical instruments, and discloses an atrial septum stoma device. The atrial septal stoma device comprises a first tube body, a second tube body and a cutting assembly. The far end of the second tube body is connected with a cutting knife, the cutting knife is provided with a cavity communicated with a tube cavity of the second tube body, and the first tube body is arranged in the second tube body and the cutting knife in a sliding and penetrating mode; the auxiliary assembly comprises a push-pull rod and a cutting auxiliary part, the push-pull rod is arranged in the first pipe body in a sliding and penetrating mode, the near end of the cutting auxiliary part is connected with the far end of the first pipe body, the far end of the cutting auxiliary part is connected with the far end of the push-pull rod, and the push-pull rod can slide relative to the first pipe body so that the cutting auxiliary part can be switched between the unfolded state and the stretc