I hardly ever do discograms...but I have an intradiscal procedure coming up, and just noticed that the needles we have expired in Jan 2014. Obviously there is an inherent liability issue with using anything expired...but do you know if this is anything to be concerned about? The only thing I can think of is that somehow the sterile seal of the package could breakdown over time, so that the sterility might not be guaranteed beyond a certain date? Is it unreasonable to still use it?