Catheter insertion unit with separate flashback indication for the cannula

摘要: An intravenous assembly includes a needle extending through hub and catheter or cannula secured at its proximal end to the hub. The side port near distal thereof in fluid communication with an annular flashback chamber formed between provide visual indication of venous entry cannula. In another embodiment, longitudinal slot internal wall defines chamber. accordance preferred construction, is hollow, plug thereto defining separate needle.