Glossary

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Radioactive stent	A stent which contains a radioactive isotope embedded within its metal surface
Radiographic	Involving the use of x-rays or x-radiation techniques
Radiologic	Involving the use of x-ray techniques
Radiopaque	Opaque to x-ray radiation and thus visible on x-ray film
Reagent	A substance employed to produce a chemical reaction so as to detect, produce, or measure other substances
Reflux	Passage of fluid in an abnormal direction, such as reflux of acid from the stomach into the oesophagus
Restenosis	The re-occlusion or closure of an artery after a new channel has been formed using a balloon or stent
Retrograde	Passing against or in the opposite direction of normal flow
Reusable surgical instrument	Instrument intended for surgical use by cutting, drilling, sawing, scratching, scraping, clamping, retracting, clipping or similar procedures, without connection to any active medical device and which can be reused after appropriate procedures have been carried out
Rheology	The science of the deformation and flow of matter, usually pertaining to the flow of blood through the cardiovascular system
Rhinomanometer	A device used to measure the airflow and pressure within the nose during respiration
Rhinometer	An instrument for measuring the nose and nasal cavities
Rigid endoscope	An endoscope which cannot be bent

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