This invention generally relates to derivatives of substituted azabicyclo hexanes. A first syringe is formed with a corrugated sheath or non-corrugated sheath which is positioned internal or external to the syringe barrel cavity. The second inflatable buoyancy chamber can be disposed solely at a neck, shoulder and front side area of the person or the front side of the person. Each phase consists of N successive steps associated respectively to said subsets, each step being executed in parallel by the processing units in order to calculate by means of the arbitration functions the \u201cpartial\u201d accepted quantity values and to reset the parameters for the next step.