Catheter insertion devices

An assembly for inserting a catheter into a blood vessel, the assembly comprising:

• a catheter insertion device comprising a catheter insertion device shaft that defines a catheter insertion device shaft lumen, wherein the catheter insertion device shaft comprises a flexible tip portion and a distal end shaft face;
• a catheter comprising a catheter shaft movably disposed within the catheter insertion device shaft lumen;
• a bleedback valve disposed within the flexible tip portion of the catheter insertion device shaft and configured to inhibit proximal flow of fluid through the bleedback valve and accommodate the catheter shaft through the bleedback valve, wherein the bleedback valve comprises a distal face aligned with the distal end shaft face of the catheter insertion device;
• an introducer comprising an introducer shaft that defines an introducer lumen and configured for insertion into the blood vessel and to accommodate detachable mounting of the flexible tip portion of the catheter insertion device shaft to the introducer to accommodate the catheter shaft into the introducer through the catheter insertion device shaft lumen;
• and
• a hemostasis valve disposed within a proximal end portion of the introducer and configured to inhibit proximal flow of fluid out of the introducer lumen, wherein the hemostasis valve comprises a radially expandable lumen, wherein, in an inserted configuration, the distal face of the bleedback valve is disposed distal to the radially expandable lumen of the hemostasis valve to cause the distal face of the bleedback valve to be in fluid communication with the introducer lumen prior to insertion of the catheter shaft.