puncture


Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Wikipedia.

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 ?
Lumbar puncture (LP) is a procedure commonly performed to assess neurological diseases such as meningitis and multiple sclerosis, measure brain enzymes and metabolite levels, administrate intrathecal chemotherapy, and measure the cerebrospinal fluid (CSF) pressure (Kluge et al.
From puncture repairs to simple brake and gear adjustments, your staff can learn from an experienced Dr Bike mechanic.
Lt Col Al Shamsi further said that weapon and tool tracing experts at the laboratory have found out that the punctures were not accidental, but had resulted from tampering with a tool.
Some manufacturers offer neither a full-size spare or a space saver, instead providing drivers with a puncture repair kit.
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.
The needle is removed to the common wall surface; during extraction, a small amount of dilation is accomplished with the needle tip by moving the needle in and out of the puncture site.
You can buy a Tyreweld puncture repair kit to keep under the seat for a temporary roadside fix.
Mike Peckham, 37, a labourer from Pontprennau, Cardiff, was left with a puncture in both left-hand tyres on Wednesday last week after driving on St Mellons Road.
Q I HAVE just bought a scooter and I contacted the company to help me when I got a puncture.
Following receipt of written informed patient consent, a skin puncture was achieved on each subject using all four devices in a randomized schedule that integrated the device, finger (third/middle or fourth/ring), and hand rotation.