ablation


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ablation

1. Medicine the surgical removal of an organ, structure, or part
2. Astronautics the melting or wearing away of an expendable part, such as the heat shield of a space re-entry vehicle on passing through the earth's atmosphere
3. Geology the wearing away of a rock or glacier

ablation

(ab-lay -shŏn) The loss of material from the surface of a moving body as a result of vaporization, friction, etc. For example, atmospheric atoms and molecules erode the surface of a meteoroid and damage the protective heat shield of a returning space shuttle.

Ablation

 

in glaciology, the wasting of the mass of a glacier or snow cover as a result of thawing, evaporation, or mechanical removal—for example, wind ablation or the falling of icebergs. It is caused chiefly by climatic factors.

Three types of ablation are distinguished according to place of appearance: subglacial (or bottom), internal, and surface. The internal heat of the earth, springs (particularly warm ones) surfacing in the glacier bed, and heat caused by the friction of the glacier in its bed are some of the causes of subglacial ablation. Internal ablation is caused by friction between the glacier components and by the circulation of water and air. The glacier surface receives warmth predominantly from solar radiation and from the air. The thermal balance of the glacier surface is the basis of all surface ablation processes. The term “ablation” is sometimes used as well as a synonym for “surface washoff.”

ablation

[ə′blā·shən]
(aerospace engineering)
The intentional removal of material from a nose cone or spacecraft during high-speed movement through a planetary atmosphere to provide thermal protection to the underlying structure.
(geology)
The wearing away of rocks, as by erosion or weathering.
(hydrology)
The reduction in volume of a glacier due to melting and evaporation.
(medicine)
The removal of tissue or a part of the body by surgery, such as by excision or amputation.
References in periodicals archive ?
Demand for catheter ablation of ventricles is growing as the use of implantable cardioverter defibrillators (ICDs) grows.
Devices used to perform microwave ablation are already available in Canada and Europe.
LONDON -- By 2017, the global electrophysiology mapping and ablation devices market is likely to achieve a value of $2.
Catheter ablation has already been shown to reduce the need for hospitalization, improve quality of life, and decrease the occurrence of atrial fibrillation.
Results for the 125 women with irregular uteri were compared with results from microwave endometrial ablation in 535 women with regular uteri.
The next study in the EFFICAS series is EFFICAS II, in which investigators will take full advantage of the real-time, objective TactiCath contact force control features to improve their ablation technique during lesion creation.
Increasing ageing population across the globe, technological advancements, rising adoption of these technologies, increasing demand for minimally invasive procedures, and rising risk factors including lifestyle disorders are the major factors which are driving global oncology ablation market.
The Food and Drug Administration approved the use of the Essure system with ThermaChoice ablation in July 2004.
The Medtronic Ablation Frontiers Cardiac Ablation System tools now approved for use in Canada include the GENius[TM] Multi-Channel Radiofrequency Generator and the Pulmonary Vein Ablation Catheter (PVAC)[TM], a single anatomically shaped mapping and ablation catheter designed to efficiently isolate the pulmonary veins to treat AF.
Of the 8,745 patients who were treated with ablation at the centers that responded to the survey, 52% had a completely successful response and did not require ongoing treatment with an antiarrhythmic drug.
Global Markets Direct's "Cardiac Ablation Devices Clinical Trials Analysis" is an essential source of data and information pertaining to product clinical trials being carried out by Cardiac Ablation Devices manufacturers, globally.