<p>A medical tool (10) for minimising post injection liquid reflux from a needle entry point in an injection surface. The tool has a resilient seal that allows a needle to pass through from a proximal side to a distal side. The seal is moveable relative to the needle to move the distal side into contact with an injection surface (3). The seal deforms when the needle is removed from the injection surface and the distal side of the seal, such that the needle entry point (2) is sealed.</p>
