A hollow needle is a needle that has a tiny empty space inside it. It is commonly used in medical procedures to remove or inject fluids, such as taking blood or administering medications. Full definition
The Coravin wine opener uses a thin hollow needle inserted in the cork to extract the wine so there is no need to remove the foil or the cork. (fb101.com)
The hypodermic needle made a splash on the medical stage in the 1850s by combining two key inventions: the conventional syringe (eventually converted from metal to glass so that users could better measure doses) and sharp, hollow needles. (fortune.com)
Many biopsies are now surgery - free (doctors can perform a needle core biopsy, using a hollow needle to remove a tiny piece of the suspicious lump). (babycenter.com)