Lubricator for a catheter guide wire

A lubricator for ex-corporeal lubrication of a catheter guide wire, comprising a channel having first and second openings formed therein, wherein the lubricator can be passed along a guidewire that has been previously inserted with a patient's body, the lubricator further comprising a third opening in liquid communication with the channel arranged to provide a connection to a pressurised liquid source, wherein the first and second openings are dimensioned such that the guide wire can extend therethrough in a non-sealing manner and contact with the contents thereof, and in which the first and second openings are dimensioned so as to be larger than the guide wire such that in use pressurised liquid supplied via the third opening leaks out of both the first and second openings and runs axially along the surface of the guidewire outside of the lubricator, thereby lubricating the guidewire such that the lubricator can be moved substantially freely along the guide wire.