A guidewire having a super elastic core surrounded by a shape memory polymer jacket. The sieve system is arranged such that a flow directions of material to be centrifuged emerging from the distributor and a flow direction of particles deposited on the membrane plates are identical. A gel material is contained within the base having disposed therein an end of use indicator. An energy level structure for electrons under a bias electric field has a mediation level, an upper lasing level, and a lower lasing level. The measurement may then be used to measure leakage from the exhaust system by subtracting it from flow measurement in a different location.