A straight needle for penetrating the scalp substantially parallel to the underlying bone structure has a trailing tissue-compatible flexible preferably transparent plastic tube which contains a stainless steel bushing. After being pulled through the scalp puncture openings by the needle, the needle...http://www.google.co.uk/patents/US4050100?utm_source=gb-gplus-sharePatent US4050100 - Permanently implanted hair piece attaching means
