Tuohy Needle
Pronunciation: TOO-hee
A specialized curved-tip needle designed for epidural space identification and catheter placement, featuring a distinctive Huber point.
Full Definition
The Tuohy needle is a specialized epidural needle characterized by its curved, pencil-point tip (Huber point) and directional bevel that facilitates controlled catheter insertion and reduces the risk of dural puncture during epidural procedures. Named after Edward Tuohy, this needle design allows for tactile identification of the epidural space through loss of resistance technique and enables threading of epidural catheters in a predictable direction. In obstetric anesthesia, Tuohy needles are typically 16-18 gauge and 3.5-4 inches in length to accommodate the increased depth required due to pregnancy-related anatomical changes. The curved tip design helps guide the catheter cephalad within the epidural space, optimizing medication distribution for labor analgesia and surgical anesthesia.
Usage
Usage note: Standard equipment for epidural procedures; distinguish from spinal needles by tip design.
In Context
- "The 18-gauge Tuohy needle was advanced using loss of resistance to saline technique." — Epidural placement procedure
- "Proper Tuohy needle angulation facilitated smooth catheter threading in the cephalad direction." — Technical procedure note