Japanese scientist develop `painless` vaccine needle
Last Updated: Thursday, March 04, 2010, 00:00

London: A Japanese scientist has developed a
new injection system that can deliver drug into human skin
without causing any pain.

The system -- a round vaccine "chip" measuring 1.5 cm in
diameter that contains as many as 300 micro needles -- injects
drug into the body without breaking the dermis layer of skin.

The needles are made up of a water-soluble polymer that
dissolves when pressed into the epidermis, the very outer
layer of skin, releasing the vaccine to be absorbed into the
circulatory system, the Telegraph reported.

Each of the dozens of needles is a 0.5 mm long and 0.3 mm
wide at the base and tests show that the efficiency of the
vaccine is not adversely affected by the method of delivery.

"The needle dissolves and administers the vaccine, after
penetrating just 0.5 millimetres in the skin. So, the patient
feels no discomfort and there is no bleeding," said Kanji
Takada, a professor of pharmacokinetics at Kyoto
Pharmaceutical University, who developed it.

"The patch can be used to deliver any type of vaccine and
people are not frightened of having the injection because they
feel nothing at all," said Takada, who took six years to develop the new drug delivery system.

Pharmacokinetics is the study of the absorption,
distribution and fate of substances delivered to the human

The new injection system could be made available for use
in hospitals in Japan within two years.


First Published: Thursday, March 04, 2010, 00:00

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