A guarded finger scalpel is squeezed between the thumb and forefinger to advance a blade out of an opening. The blade is used to make an incision in the patient's skin, thereby facilitating insertion of a catheter and its line in a patient. Thereafter, the manual pressure is released, and the blade is...http://www.google.de/patents/US5545175?utm_source=gb-gplus-sharePatent US5545175 - Disposable quarded finger scalpel for inserting a line in a patent and lock off therefor
