Q: How do they put that very small hole in a hypodermic needle? A: Actually they don ... or ribbon, of stainless steel and form it into a tube by passing it through a series of rollers.

In very rare cases, the needles of prefilled syringes may become ... normally unable to visualize low-density liquids inside stainless steel in such detail because the transmitted light beam ...

A smooth steel hypodermic needle, by contrast, makes contact with a maximum number of nerves, and is therefore uncomfortable. Professor Aoyagi's needle, etched from silicon, mimics the labrum and ...