The invention relates to a needle device for a nerve block, which comprises a gripping part having a longitudinal passage through which a liquid fluid flows, said liquid fluid also flowing through the inside of a needle (13) aligned with the longitudinal passage. The device also comprises a nerve stimulator through which electricity is transmitted to the needle (13). The gripping part comprises a radial duct (3) that intersects tangentially with the longitudinal passage (2), the radial duct (3) having two opposite female couplings (3a, 3b) into either of which the nerve stimulator (4) can be inserted, depending on whether the user is left-handed or right-handed.
