The diffuser comprises a conical primary diffuser (10) followed by a cusp diffuser (12).

The body includes a cylindrical mixing chamber that widens at the outlet as well as a conical diffuser.

The conical/tapered diff user (280) within the light pipe is illuminated by a reflector (230) with a white textured surface that reflects a plurality of rearward-directed illumination sources (282) back into the diff user.

The segment length in the form of conical diffuser exceeds the channel diameter at the cylindrical segment (10).

A catheter assembly (10) is provided having a conical diffuser tip (18) for use in rapid infusion procedures.

In the first alternative embodiment a sprinkler channel is formed by a segment (10) of a cylindrical configuration connected with a segment (11) made as a conical diffuser.

A fluid nozzle spray is built in the form of a body (1) with two coaxial channels (2) of the same cross-section designed for head liquid supply and a nozzle having a shape of a conical diffuser (3).

The conical diffuser tip provides a flared opening whereby the velocity of an infusant is decreased as the infusant travels through the catheter tip and exits into the vascular system of a patient.