Abstract: The present invention provides a catheter assembly which comprises catheter tubing, a hollow needle and a guide member with a longitudinal bore there through for aiding insertion of the hollow needle into the catheter, which catheter assembly is characterized in that the longitudinal bore in the guide member has a narrower portion and a communicating broader portion, the narrower portion being adapted to receive in close fit the hollow needle and the broader portion being adapted to receive in close fit the catheter; whereby in use the catheter tubing may be positioned for insertion of the hollow needle.