From Mike Whittaker
Your piece about graphene smart patches for monitoring diabetes (26 March, p 24) focuses on automatically releasing metformin for type 2 diabetes. It seems to me that the device would be most useful as a continuously monitoring blood-glucose sensor, that could be paired with an insulin pump for people with type 1 diabetes.
In that case, the technology could be deployed within a year or so, without any need for a drug delivery system. Existing continuous blood-glucose systems are quite expensive and require costly sensors, which are not supplied free on the NHS and must be replaced every few days.
Stapleton, Shropshire, UK
