A flow switching device for catheterization via a three way catheter has a housing with four openings, and first, second and third distal hydraulic conduits originating at the first, second and third openings, respectively. A switch enables changes among a first operative configuration wherein the first and third openings are in communication, a second operative configuration wherein the second and fourth openings are in communication, and a third operative configuration wherein the first and second openings are in communication, and a fourth operative configuration wherein the second and third openings are in communication. A hydraulic bifurcation with a respective proximal hydraulic branch originates from the fourth opening, and fourth and fifth distal hydraulic conduits originating distally from the proximal hydraulic branch are in fluid dynamical communication with each other.
