Researchers at the Georgia Institute of Technology have successfully developed a technique called Two-Photon Polymerisation (2PP).
This technique uses fast lasers and a mixture of monomer and initiator. The lasers initiate polymerisation at precise locations which means that very fine polymer structures. The remaining unreacted monomer can be rinsed away, leaving a very accurately produced solid structure.
"Microneedles" produced in the way can be attached to patches which are pressed onto the skin to deliver medecines or take blood samples in a painless but controlled way.
Although some further work needs to be done, there are hopes that within ten years a pain-free all-in-one glucose sensor and insulin delivery system may be available.
See the RSC report here.