HP has signed a licensing deal to allow its printing technology to be used to give injections to humans.

The technology uses micro-needles embedded in a patch which puncture the outside layer of the skin and insert the drug.

Skin patches are already used for some drugs, like nicotine replacement, but many drugs cannot penetrate the tough outer surface of the skin.

The patch was developed at HP Labs but is being taken to market by Irish company Crospon which will pay royalties to HP.

"This industry-first skin patch invented by HP allows Crospon to offer a superior drug delivery platform for doctors and patients," said John O'Dea, chief executive at Crospon.

"We look forward to working with our pharmaceutical customers to bring this breakthrough solution to market."

The patch approach to drug dispensing overcomes some serious problems with the traditional syringe. Used needles are hazardous to dispose of and can be vectors for infection if shared, besides being painful to use.