An embodiment relates to a method for delivering a unidirectional afferent nerve stimulation treatment. One or more lancet tips are sandwiched between a first web and a second web of material to protect the sterility of the lancet tips. The data items each include a sequence number through which the reorder engine may reconstruct the correct order of the data items. Additional features include the use of a swing arm to improve passenger safety, and bumpers to protect the cart and body from collision and abrasion.