A flow diverter for catheterization using a three-way bladder catheter comprises a housing (7) having four openings (11, 12, 13, 14), and -first, second and third First, second and third distal hydraulic conduits (1, 2, 3) starting at the respective openings (11, 12, 13) and-the first and third openings (11, 13) The first operation configuration is connected, the second operation configuration is connected to the second and fourth openings (12, 14), the first and second openings (11, 12) are connected A switching means (20) that engages the housing by obtaining a third operating configuration, a fourth configuration in which the second and third openings (12, 13) are connected, and-said fourth opening A corresponding proximal hydraulic branch (6) starting from part (14), starting distally from said proximal hydraulic branch, or And a water pressure 2 branches comprising a fourth and fifth distal pressure conduit is connected to a dynamic fluid (4,5) relative to each other (17). [Selection] Figure 1３方向膀胱カテーテルを用いたカテーテル法のための流れ切替器が、－４つの開口部（１１、１２、１３、１４）を有する筐体（７）と、－第１、第２、および第３の開口部（１１、１２、１３）でそれぞれ始まる第１、第２、および第３の遠位水圧導管（１、２、３）と、－第１および第３の開口部（１１、１３）がつながっている第１の動作構成、第２および第４の開口部（１２、１４）がつながっている第２の動作構成、第１および第２の開口部（１１、１２）がつながっている第３の動作構成、第２および第３の開口部（１２、１３）がつながっている第４の構成を得ることによって筐体と係合する切替手段（２０）と、－前記第４の開口部（１４）から始まる対応する近位水圧分岐（６）、前記近位水圧分岐から遠位に始まり、かつ互いに対して流体で動的につながっている第４および第５の遠位水圧導管（４、５）を備える水圧２分岐（１７）とを備える。【選択図】図１
