An electrical junction assembly for a wiring harness couples one or more branch wires to a main trunk line. The neurostimulation is harmonized with the pulmonary activity of the patient. The retention sleeve is fixed around the coupling element, so that the coupling element is releasably held within the extension. The detector comprises a switch which is located within a pivoting radius of the extension bar and can be pivoted under the action of the extension bar, and a detector body on which the switch is pivotably installed and configured to transmit at least a electrical signal to the outside according to pivoting angles of the switch. The apparatus includes a pressing member provided between the front cabinet and the connection duct to push the connection duct toward the blower to make the connection duct adhere closely to the blower housing.