Brining makes meat juicier and enhances its flavor, but salt diffuses through flesh very slowly. You can double or triple the rate of diffusion by injecting the brine deep into muscle tissue. This is very easy to do using a butcher’s syringe, also called a meat injector. Meat injectors usually include two large needles: one has a slanted tip for marinades with spices, and one is perforated for diffusing liquids.
adapted from Modernist Cuisine at Home