Ichor
Ichor is a small tablet based device which measures and verifies the flow rate of blood into a patient during a transfusion. This reduces incidents of TACO (Transfusion Associated Circulatory Overload), the most common preventable cause of death related to blood transfusion. This device can also estimate the current Hb level of a patient by interpreting their mass, initial Hb and the volume of blood being infused, and can then recommend if the patient is unlikely to need another unit, despite being assigned one, thus lowering rates of I&U (Inappropriate and Unnecessary) transfusions.
The user (transfusion staff) experience was particularly interesting to me as existing methods were inefficient.