Embodiments of the present invention improve integration of heterogeneous software components. The ladder cage includes opposite first and second sidewalls each extending parallel to a longitudinal axis. The fabric member is wound around the inflator several times into a tubular shape such that it covers a plurality of gas discharge ports provided in the inflator and such that one end thereof opens to the inside of the airbag, and the fabric member is inserted into the inner tube. The concentric electrode patch may be removably affixed to the patient’s skin by adhesive or magnets.