The use by date/shelf life is determined by the terms of the CE Mark and Device Classification - the 18 months is applied to the current batch in storage once the Mark is granted, not from the date of manufacture. It's a standard expiry that applies to all devices under the same classification.
TIS are testing the existing stock to gain a better understanding of how long the product lasts under refrigerated storage - the shelf life may effectively be indefinite provided the product is kept refrigerated.
TIS Price at posting:
36.0¢ Sentiment: Hold Disclosure: Held