Inability to Thread Epidural Catheter Through Epidural Needle

Variations in epidural catheter manufacture: Implications for bending and stiffness

“…Designs that reduce I include making a thinner wall, but this may increase kinking or contribute to difficulty advancing a catheter beyond the tip of the needle. 18 Another design tactic is to reduce E by using a more elastic material. The coil reinforced catheter accomplishes this.…”