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(nek″rŏ-tī′zing) Causing or undergoing necrosis.


(nĕ-krŏt′ō-mē) [″ + tome, incision] 1. Dissection of a cadaver. 2. Incision into necrotic tissue.


(nēd) 1. Something required, wanted, or essential. 2. A duty or obligation. 3. Any disease or condition for which a patient seeks a remedy. 4. A motivation. 5. Extreme want or poverty.


(nēd′ĕl) A pointed instrument for stitching, ligaturing, puncturing, or cannulating. Needles may be straight, half-curved, full-curved, semicircular, double-curved, double-ended, sharp or blunt-tipped, solid, or hollow. They are classified as cutting edge or round point. Cutting-edge needles are used in skin and dense tissue; round-point needles are used for more delicate operations, esp. on soft tissues. When a needle is used for stitching, the suture material may be attached through an eye, french eye, or, more commonly, an easily detachable swaged needle.

aneurysm n. A blunt, curved needle with an eye in the tip used for passing a suture around a vessel. SYN: ligature needle.

aspirating n. A needle, usually fitted to a syringe, for withdrawing fluids from a cavity.

atraumatic n. Pencil-point n.

cataract n. A needle used in removing a cataract.

discission n. A cataract needle for making multiple cuts into the lens capsule.

Hagedorn n. SEE: Hagedorn needle.

hypodermic n. A hollow needle of varying length and diameter, used for intradermal, subcutaneous, intramuscular, and intravenous injection.

knife n. A narrow knife with a needle-like point.

ligature n. Aneurysm n. obturator n. A device that fills the lumen of a needle or trocar to keep the lumen patent when it punctures tissue.

pencil-point n. A needle with a tapered tip that does not damage tissue as much as a beveled needle. Pencil-point needles are commonly used in lumbar puncture to reduce leakage of cerebrospinal fluid from the subarachnoid space, and in some abdominal surgeries. SYN: atraumatic needle.

Reverdin n. SEE: Reverdin needle.

scalp vein n. A needle for the administration of intravenous fluids, having a flat flange on each side to facilitate anchoring it after its placement in a small vein.

stop n. A needle with an eye at its tip, and a flange or shelf extending out from its shank end that prevents the needle from being inserted farther than the shelf.

Tuohy n. SEE: Tuohy needle.

needle exchange program

A public health program for collecting used hypodermic syringes and exchanging them for sterile ones. Such programs are designed to decrease the spread of diseases (like ...

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