If you put blood in the cassette and it reacts with the reactant there, the reactant is thereby changed. So sterilization is not the issue, how can reaction take place if it has already taken place. It is conceivable that they are using an actual reagent rather than a reactant, but doubtful.
But even if they were and the reagent does not change, then how can you get the blood out of the cassette after it is in. Sterilizing will not do the trick. It's not testing for the presence of a microbe, but the presence of proteins (antibodies) in the blood. Sterilizing wouldn't change them.
There is no way I can conceive of that the cassette could be re-used.
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