Measurements of insulin quantities in a syringe are performed optically in an integrated insulin dose recorder/blood glucose meter. The syringe is placed in a holder before and after the administration of the dose. Liquid quantities in the syringe are determined by comparing optical response patterns...http://www.google.ca/patents/US6113578?utm_source=gb-gplus-sharePatent US6113578 - Optical dose measurements in syringes
