Abstract: A system for delivering an implantable medical device is provided including the medical device, a delivery wire that is rotationally coupled to the medical device, and a catheter. The delivery wire includes a spiraling marking extending around the delivery wire to provide visual confirmation that the wire is rotating. The medical device is delivered to a target site within a patient's body, and the delivery wire is rotated to release the medical device from the wire. Observation of the rotating spiral markings helps ensure that the medical device is being released from the wire. The rotational coupling between the delivery wire and the medical device limits the medical device from becoming unintentionally released, and allows for repositioning of the device within the body even after the device has been exposed from the catheter.