Retention member and application thereof

An intravenous (IV) catheter introducer assembly comprising:

• a catheter hub having an exterior surface and an interior surface defining an interior cavity;
• an introducer needle comprising a sharp distal tip, a shaft, and a proximal end attached to a needle hub;
• a tubular member extending distally from the catheter hub having a length and a lumen having the introducer needle disposed therein;
• and
• a retention member disposed within the interior cavity of the catheter hub, said retention member having a body having a central lumen sealed against the introducer needle, the retention member having a surface feature formed as a conic helix traversing on an exterior surface of the retention member defining a vent path.

A method for assembly a catheter assembly comprising:

• mounting a needle comprising a needle tip, a shaft, and a proximal end to a needle hub;
• mounting a catheter tube with a lumen to a catheter hub, the catheter hub comprising an interior surface defining an interior cavity;
• fixing a retention member in the interior cavity of the catheter hub so that the retention member is fixed from moving along an axial direction, the retention member comprising a bore, a distally facing surface, and a proximally facing surface;
• placing the needle through the bore of the retention member and through the lumen of the catheter tube;
• and
• wherein the retention member comprises a longitudinal length of X and a venting path length formed on an exterior surface thereof of at least 2X, and wherein X is number representing a length.