Mastoid surgery is usually performed under general anaesthetic and can take up to 3 hours. The method used will depend on the level of infection and damage within your middle ear. Your surgeon will make an incision (cut) either behind your ear or just above your ear. They will remove the bone that is covering the infected area leaving the area (called the mastoid cavity) open.
steam noun [U]. B2 the âhot âgas that is âproduced when âwater âboils: Steam ârose from the âsimmering âstew. steam âturbines a steam âengine/âlocomotive the âage of steam (= the âperiod when steam âprovided âpower for ârailways and âfactories) The âpump is âdriven by steam.
A steam engine is a heat engine that performs mechanical work using steam as its working fluid. Using boiling water to produce mechanical motion goes back over 2000 years, but early devices were not practical. The Spanish inventor Jeronimo jerÃ³nimo De ayanz Y beaumont patented in 1606 the first steam. Engine in 1698 Thomas savery patented a steam pump that used steam in direct contact with the water being. pumped