Backstroke needle arrangement for taking a blood or fluid sample has a chamber with at least a visualization area and a screen from opening or closing the canula

摘要

Needle arrangement has a housing with proximal and distal ends and a chamber wall that defines a chamber within the housing. At least a transparent area of the housing wall permits observation of the fluid or liquid flowing into the chamber. Connected to the chamber is an intravenous canula that has a screen that can be used to open or close the canula.