A medical fluid connector is described that comprises a first fluid connector portion (310) that can be connected to a second fluid connector portion (300). The first fluid connector portion (310) comprises a first locking member a lumen (314) and a septum (312) for sealing the lumen. The second fluid connector portion (300) comprises a second locking member a lumen (304) and a hollow needle (302) that is retained in and protrudes from the aperture at the end of the lumen (304). The variation in cross sectional area of the fluid path through the fluid connector portion (300) is less than 1mm to reduce mixing effects. The use of such a connector for neurosurgical purposes is described.
