The invention concerns a multipurpose catheter comprising connection means consisting of a head (3) made of rigid plastic material provided with three independent inlets (30, 31, 32) emerging each in an inner bore (34) via bores (35, 36, 37), said bores (34, 35) being provided to receive through sealed means (23, 24) the external profile of a cylindrical body (2) such that said bores (35, 36, 37) of each independent inlet communicate through holes (25, 26, 28, 29) passing through the cylindrical body (2) and/or the sealing means (23, 24) with non-coaxial channels (21, 22, 27) such that the channels (21, 27) enable the insertion, either of liquid products, or a range of surgical mandrins and/or other instruments, or both simultaneously at different operating sites.