Tuohy needle is used for –
**Core Concept**
A Tuohy needle is a type of catheter-over-needle device used in medical procedures, specifically in the placement of epidural catheters, peripheral IV lines, and central venous catheters. The Tuohy needle has a beveled edge and a distinctive shape that facilitates the introduction of a catheter into a vein or tissue space.
**Why the Correct Answer is Right**
The Tuohy needle is designed for the precise placement of catheters in various medical contexts. When using a Tuohy needle, the practitioner carefully advances the needle into the target site, then withdraws the needle, leaving the catheter in place. This technique is crucial for minimizing complications and ensuring the proper function of the catheter. The beveled edge of the Tuohy needle allows for smooth catheter introduction, reducing the risk of trauma to the surrounding tissue.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the primary use of a Tuohy needle. Although Tuohy needles may be used in peripheral IV placement, this is not their primary function.
**Option B:** This option is incorrect because Tuohy needles are not typically used for lumbar punctures, which require a different type of needle.
**Option C:** This option is incorrect because Tuohy needles are not used for arterial cannulation, which requires a specialized needle designed for accessing arterial vessels.
**Clinical Pearl / High-Yield Fact**
When using a Tuohy needle, it is essential to maintain asepsis and to carefully observe the patient's vital signs to prevent complications associated with catheter placement.
**Correct Answer:** D.