puncture


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puncture

1. a perforation and loss of pressure in a pneumatic tyre, made by sharp stones, glass, etc.
2. the act of puncturing or perforating

Puncture

 

a piercing of the wall of any cavity, vessel, hollow or parenchymatous organ, tumor, or infiltrate for purposes of treatment or diagnosis. Exploratory punctures are used to help accurately diagnose diseases either through analysis of the contents of a cavity—the pleural cavity, for example—and subsequent cytological, biochemical, and bacteriological examination or through microscopic, ultramicroscopic, cytochemical, and chromosomal study of cells obtained from pathologically altered organs. It is also used for measuring the pressure in the cavities of the heart, large blood vessels, and the cerebrospinal canal and for introducing into a cavity contrast materials or air (radiodiagnostics). Therapeutic punctures are used to extract pus, blood, air, or fluid from a cavity, wash the cavity, and introduce medicinal substances. Often both types of punctures coincide.

There are a number of common punctures. Veins are punctured in order to obtain blood for analysis and for bloodletting, injection of medication, or transfusion of blood. In the case of exudative pleuritis, the pleural cavity is punctured in order to remove air from the cavity and induce artificial pneumothorax. The abdominal cavity is punctured if ascites is present, and joints are punctured for therapeutic and exploratory purposes. Puncture of the cerebrospinal canal is performed for analysis of the cerebrospinal fluid or injection of medications or radiopa-que substances. The urinary bladder is punctured when there is urinary retention and it is impossible to introduce a catheter. Puncture is done with a syringe and a special needle or trocar, according to all the principles of asepsis and anesthesia.

REFERENCE

Diagnosticheskaia i lerapevlicheskaia lekhnika. Edited by V. S. Maiata. Moscow, 1969.

A. N. SMIRNOV

puncture

[′pəŋk·chər]
(electricity)
Disruptive discharge through insulation involving a sudden and large increase in current through the insulation due to complete failure under electrostatic stress.
(science and technology)
To pierce or indent.
References in periodicals archive ?
Semi-rigid lancets were provided by Terumo Corporation (Tokyo, Japan) and consisted in a 23-gauge needle that was remodelled to permit less painful puncture than a traditional lancet (Fig.
In accordance with the IHS diagnostic criteria, headache usually begins within 48 hours from the puncture and spontaneously disappears within 1 week (Rodriques & Roy, 2007).
The chosen epidural space was as close as possible to the dural puncture site.
Many factors influence the incidence of PDPH including needle size, needle tip design, age, gender, pregnancy, bevel orientation to Dura, attempts of lumbar puncture and clinical experience of operator.
The technology is scalable down to a hypodermic needle for gaining access to a vein all the way up to a brain drill for drilling into the space between the skull and the brain, which is unique from other puncture access devices that serve one application.
weiserianus by the transverse distance between punctures on elytra distinctly larger than the diameters of punctures and the first segment of hind tarsus as long as the last segment.
Tony Bowman, managing director of etyres, said: "The good news is that about half of all flat tyres caused by a puncture can be repaired safely and cheaply without the need for motorists to fork out for a replacement tyre and suffer a big dent in their finances.
Tracheoesophageal puncture (TEP) with speaking-valve placement is the preferred method of voice rehabilitation in patients postlaryngectomy.
NEW YORK -- The American Academy of Pediatrics is likely to drop its recommendation for lumbar puncture and culture in all children 6-18 months of age who present with a first, simple febrile seizure, according to the chair of the AAP committee considering the change.
The Biogel Puncture Indication System can detect up to 97 percent of punctures and was engineered to provide the optimum level of contrast with Biogel overgloves, indicating punctures faster and more clearly.
Key statement: A tire puncture sealant according to the present technology is a tire puncture sealant containing a latex and/or an emulsion and an anti-freezing agent, the latex and/or emulsion containing, as solids, at least a polymer and/or an organic compound (other than the polymer), a content of solids being from 20 to 65% by mass with respect to the total mass of the sealant, and the difference between the specific gravity of the solids and the specific gravity of a mixture of water and anti-freezing agent in the tire puncture sealant being within [+ or -]0.
In a special closed demonstration circuit representing a typical road we tried out DriveGuard tyres inflated to normal pressure on a Volkswagen Golf and then deflated to simulate loss of air through a puncture.