Medical devices for navigation through anatomy, including guidewires, which may have a core wire, a slotted tubular member, or both. The player may try his luck against a frantic rhythm with minimum return on each game or at a slower-pace rhythm with a higher return on each game. The tear seam defines an airbag door. An arrangement according to the invention allows to separate oxygen with improved efficiency and improved convenience with respect to maintenance and noise. Flow characteristics of hydraulic circuits are selected to provide suspension system damping for appropriate wheel control.