A delivery apparatus for delivering a medical device to a heart defect by a catheter includes a second wire section having a first end securely connected to a first wire section. A connecting member is mounted to a second end of the second wire section and is connected to the medical device. The second wire section has a cross sectional area smaller than the first wire section. When the medical device is delivered to the heart defect and is seated in a deployed position occluding the heart defect after the catheter is retracted, the second wire section remains connected to the medical device to absorb interfering vibration from the heartbeat, avoiding the medical device from deviating from the deployed position.
