- 1. A slender, solid, usually sharp-pointed instrument used for puncturing tissues, suturing, or passing a ligature around or through a vessel. 2. A hollow n. used for injection, aspiration, biopsy, or to guide introduction of a catheter into a vessel or other space. 3. To separate the tissues by means of one or two needles, in the dissection of small parts. 4. To perform discission of a cataract by means of a knife n.. [M.E. nedle, fr. A.S. naedl]- aneurysm n., artery n. a blunt-pointed, curved n., set in a handle, with the eye at the point, used for passing a ligature around an artery.- aspirating n. a hollow n. used for withdrawing fluid from a cavity, when combined with an aspirator tube attached to one end.- Emmet n. a strong n. with the eye in the point, having a wide curve, and set in a handle, used to pass a ligature around an undissected structure.- exploring n. a strong n. with a longitudinal groove, which is thrust into a tumor or cavity to determine the presence of fluid, the latter escaping along the groove.- Francke n. a small lancet-shaped, spring-activated n., used to evacuate a small effusion of blood.- hypodermic n. a hollow n., similar to but smaller than an aspirating n., attached to a syringe; used primarily for injection.- lumbar puncture n. a n., provided with a stylet, for entering the spinal canal or cisterna magna, with a bore of at least 1 mm and 40 mm or more in length.- stop-n. a surgical n., with the eye at the tip, the shank of which has a projecting shelf to arrest the n. when it has passed the desired distance through the tissues.- Tuohy n. a n. with a lateral opening at the distal end, designed to cause a catheter passing through the n.'s lumen to exit laterally at a 45° angle; used to place catheters into the subarachnoid or epidural space.- Veress n. a n. equipped with a spring loaded obturator that is used for insufflation of the abdomen in laparoscopic surgery.
* * *nee·dle 'nēd-əl n1) a small slender usu. steel instrument designed to carry sutures when sewing tissues in surgery2) a slender hollow instrument for introducing material into or removing material from the body parenterallyneedle vt, nee·dled; nee·dling 'nēd-liŋ, -əl-iŋ to puncture, operate on, or inject with a needle <needling a cataract>
* * *n.a slender sharp-pointed instrument used for a variety of purposes. Needles used for sewing up tissue during surgery are of various designs, for specific operations; they are equipped with an eye for threading suture material or they have the suture material fused onto them (so-called atraumatic needles). Hollow needles are used to inject substances into the body (in hypodermic syringes), to obtain specimens of tissue (see puncture), or to withdraw fluid from a cavity (see aspiration, biopsy). See also stop needle.
* * *nee·dle (neґdəl) [L. acus] 1. a sharp instrument for suturing or puncturing. 2. to puncture with a needle, as in discission of the lens for treatment of cataract.
Medical dictionary. 2011.