1. Device for locating the peridural space, characterized by the fact that it comprises a coupling (10) with three branches comprising a distal branch (12) able to receive a puncture needle (14), a main proximal branch (16) provided with an inflatable bag (20) and a lateral proximal branch (18) provided with a non-return valve (26) whereof the inlet (28) is able to be connected to a syringe (32), in order that the actuation of the piston of the syringe causes the inflation of the inflatable bag when the puncture needle is inserted in the cutaneous surfaces of the space to be located, the penetration of the needle into the peridural space thus being visualized by the deflation of the inflatable bag.
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