Abstract: An injection device for injecting a liquid into meat includes a housing, a conveyor, and a modular needle bridge arranged above and across an endless belt conveying surface of the conveyor. A drive system is provided to move the conveying surface in at least two opposite conveying directions. The needle bridge has vertically stacked needle bridge blocks with aligning means, and needle head cavities of a non-circular cross-section for receiving correspondingly shaped needle heads with hollow injection needles that can move vertically in the needle head cavities. The needle head cavities are arranged in rows to form a continuous regular injection pattern.