910 is suitably made of a strong resilient electrically insulating plastic material such as polypropylene or polycarbonate in a preferred embodiment the ferrule is a colored plastic with the color utilized to identify the type of instrument of which it is a part for example a blue ferrule might identify a maryland dissector while a red ferrule might identify a single acting scissors regardless of color the ferrule is installed by being moved slidably along shrink wrap 20 in the direction indicated at 945 when the ferrule means 910 is moved in the direction indicated at some point the portion of the frusto conical projection 938 located adjacent wall 936 resiliently deforms outwardly to pass over rim 934 of rigid plastic housing 914 after wall 936 passes wall 922 the frusto conical conical projection 938 snaps back into a mating engagement with groove 940 of the rigid plastic housing 914 in this mated position the electrically insulating ferrule connecting means 910 overlaps peripheral electrical conductive portion 912 of aluminum tube 20 as well as substantial portions of the electrically insulating shrink wrap 20 and the electrically insulating housing 914 in this manner the ferrule connecting means 910 ensures that the possibility of short circuiting and electrical disruption is eliminated the preferred laparoscopy instruments of the invention are preferably assembled.