English to French Tech/Engineering Patents extracorporeal circuit

said oxygenation assembly (4) comprises an oxygenator (9) , a first dialyzer (6) , which is arranged upstream from the
10 oxygenator (9), a circulation circuit (7); for the circulation of a dialyzer bath and connected to the dialyzer (6) , an acidifier (10), which is suited to introduce an acid substance into the circulation circuit (7) of the dialyzer bath, and basic neutralization means (11, 12) which are arranged downstream of oxygenator (9) .

il s'agit dans ce cas d'un appareil et non pas d'une substance!

=acidificateur ?!