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Tuohy needle
A Tuohy needle is a hollow hypodermic needle, very slightly curved at the end, suitable for inserting epidural catheters.
The needle features an anti-coring curve at its tip (as shown in the picture above left) designed to cause a catheter passing through the needle's lumen to exit laterally at a 45 degree angle.
== Epidural needle ==
Literally, an epidural needle is simply a needle that is placed into the epidural space. To provide continuous epidural analgesia or anesthesia, a small hollow catheter may be threaded through the epidural needle into the epidural space, and left there while the needle is removed. There are multiple types of epidural needles as well as catheters, but in modern practice in developed nations, disposable materials are used to ensure sterility.
Epidural needles are designed with a curved tip to help prevent puncture of the dural membrane. But following accidental dural puncture, headache occurs in up to 85% of patients causing significant perioperative morbidity. However, in the inadvertent case dural perforation, the incidence of headache can be lowered by identifying the epidural space with the needle bevel oriented parallel to the longitudinal dural fibers which limits the size of the subsequent dural tear.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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