"Ancorragio" is "anchorage". However, in this case, i would translate "barba d'ancorragio" as "anchoring hooks" (barbs) (clips). Therefore, a rough translation would be: To install: Use two bipolar, coaxial, polyurethane electrocatheters with anchoring hooks. I think that the original text has some spelling errors. If there are catheters involved the correct spelling is "catetere" instead of "cateteri" and "bipolari" should be "bipolare" instead.