A painful prick of the fingertip reveals a mountain of
medical information for many diabetes patients. But health professionals
have long struggled to find a reliable and painless way to gather blood
sugar measurements. Just last year, Google announced that it was
developing contact lenses
that measure glucose levels in its user’s tears. But now, nanoengineers
may have found an even easier way for diabetes patients to monitor
their vital levels: temporary tattoos.
Amay Bandodkar, a
researcher at the University of California, San Diego, has created a
flexible sensor that uses a mild electrical current to measure glucose
levels in a person’s body. Measuring blood sugar levels multiple times a
day is vital for diabetes patients because it shows how well their body
is managing their disease as well as the dose of insulin they require,
if they need any at all. But because many people find needles
unpleasant, they tend to avoid measuring their levels, which puts them
at risk of developing serious medical complications. The new device is
painless—It contains electrodes printed on a thin tattoo paper that
patients can even dispose after use. “Presently the tattoo sensor can
easily survive for a day,” Bandodkar said in a statement. “These are extremely inexpensive—a few cents—and hence can be replaced without much financial burden on the patient.”
The
tattoo has already provided accurate glucose measures for seven healthy
patients, the team reported in a recent issue of the journal Analytical Chemistry.
The patients, all non-diabetics between the ages of 20 and 40, wore the
tattoos before eating a sandwich and drinking a soda. Following the
carb-rich meal, the tattoo recorded the spike in each patient’s glucose
levels as accurately as a traditional finger-stick device. The tattoo is
a few steps away from providing the numeric value of glucose levels, so
scientists have to remove and analyze it in order to retrieve its
measurements.
Eventually, Bandodkar said the tattoo will have “Bluetooth
capabilities to send this information directly to the patient's doctor
in real-time or store data in the cloud.”
The researchers hope the
tattoo will eventually be used to monitor levels of other compounds in
the blood, like metabolites, medications, or alcohol and illegal drugs.
Whatever the application, the fewer needles the better.