A safety syringe having a sheath advanceable into a covered position by operation of the plunger with a mechanism for securing the sheath in the covered position. Beneficially, the new method and apparatus may be employed to insert and withdraw tubing to depths greater than ever possible before. As a result of the position of both sensors, the temperature measured using the first temperature sensor is more readily influenced by the valve and the temperature registered by the second temperature sensor is more readily influenced by the environment. In addition or alternatively, the debris bag can comprise a seam disposed at a location spaced apart from the open end for defining at least one discharge passage for the bag. The at least one partition is located in the first cavity and the second cavity, so as to separate the inlet, the ventilated opening and the outlets into a plurality of sub-inlets, a plurality of sub-ventilated openings and a plurality of sub-outlets, respectively.