Systems and methods for needle and catheter advancement
Intravenous access is achieved by introducing a catheter over an access needle which is initially present in the catheter. A tapered dilating element is positioned over the needle and provides a transition between the needle and a larger catheter lumen. The access needle is hollow and has a port which allows blood to flash back through a lumen of the catheter so that flashback can be observed on a catheter hub or the catheter itself
1. A method of making an insertion tool, comprising:
forming a catheter including a distal end opening in communication with a catheter lumen, the distal end opening having a first diameter;
disposing a dilating element over a distal portion of a needle proximate a tissue-penetrating distal end of the needle, the dilating element having an outer diameter equal to or greater than the first diameter;
permanently attaching the dilating element to the needle; and
inserting the needle into the catheter lumen such that at least a portion of the dilating element is positioned in the distal end opening of the catheter and the tissue-penetrating distal end of the needle is distal of the distal end opening of the catheter.
2. The method according to claim 1 , further comprising including a flashback port in the needle proximal of the dilating element.
3. The method according to claim 2 , wherein forming the catheter comprises including a transparent or translucent region proximate the distal end opening to align with the flashback port of the needle following the inserting step.
4. The method according to claim 1 , further comprising providing a guidewire, wherein the guidewire is inserted into a lumen of the needle.
5. The method according to claim 4 , wherein the guidewire includes a safety tip with a coiled configuration, wherein the safety tip assumes a straight configuration inside of the lumen of the needle and transitions to the coiled configuration outside of the lumen of the needle.
6. The method according to claim 4 , wherein the guidewire has a proximal end coupled to a slider, the slider positioned over a proximal end of the needle.
7. The method according to claim 5 , further comprising including a slot in the needle, wherein a portion of the guidewire is configured to move through the slot when the slider is moved from a proximal position with the safety tip inside of the lumen of the needle to a distal position with the safety tip outside of the lumen of the needle.
8. The method according to claim 1 , wherein forming the catheter further comprises attaching a catheter hub to a proximal end of the catheter, the catheter hub including a hemostasis valve.
9. The method according to claim 1 , wherein the dilating element is tapered from the outer diameter to a second diameter smaller than the outer diameter.
10. The method according to claim 9 , wherein the dilating element is tapered to the second diameter both distally and proximally from the outer diameter.
11. The method according to claim 1 , wherein the dilating element comprises a polymer material.