A cover for magnetizing a shaft of a tissue-penetrating medical device isdisclosed including a sleeve member havinga hollow body to form a protective closure over the shaft of the tissue-penetrating medical device. The open end of the hollow bodyprovides a receiving space for receiving the shaft of the tissue-penetratingmedical device. A magnet is disposed on the sleeve member.Medical devices and methods of magnetizing the shaft of a tissue-penetratingmedical device using the cover are also disclosed.
