Abstract: Disclosed are insertion assemblies of rapidly insertable central catheters (“RICCs”) and methods thereof. For example, a RICC insertion assembly can include a RICC, an introducer needle, an access guidewire, and a coupler assembly coupling the foregoing together. The introducer needle can include a needle hub over both a sheath and a needle shaft. The sheath can seal a needle slot except for that under a sheath opening. A distal end of the access guidewire can be disposed in the introducer needle just proximal of a needle tip. The coupler assembly can include a nose piece and a tail piece coupled together. The tail piece can include an extension arm by which a proximal end of the access guidewire is held. The access guidewire can enforce a loop in the access guidewire over which the RICC is disposed, thereby keeping the RICC insertion assembly in a relatively compact form.