Blood collection devices; vascular access devices; intravenous devices; needleless blood collection devices; needleless vascular access devices; needleless intravenous devices; devices for interfacing with an intravenous catheter to collect blood; vascular access devices for interfacing with an intravenous catheter to collect blood; intravenous devices for interfacing with an intravenous catheter to collect blood; devices for collecting blood through an intravenous catheter; vascular access devices for collecting blood through an intravenous catheter; intravenous devices for collecting blood through an intravenous catheter; devices for accessing vasculature through an intravenous catheter; vascular access devices for accessing vasculature through an intravenous catheter; intravenous devices for accessing vasculature through an intravenous catheter; blood collection devices for connecting a blood collection tube or syringe to an intravenous catheter; vascular access devices for connecting a blood collection tube or syringe to an intravenous catheter; intravenous devices for connecting a blood collection tube or syringe to an intravenous catheter; blood collection devices comprising a connector and a cannula extendable relative thereto; vascular access devices, namely, aspiration devices for drawing blood, comprising a connector and a cannula extendable relative thereto; intravenous devices, namely, aspiration devices for drawing blood, comprising a connector and a cannula extendable relative