Laryngeal mask airway A laryngeal mask airway LMA also known as laryngeal mask is a medical device that keeps a patient 39s airway open during anaesthesia or unconsciousness. It is a type of supraglottic airway device. A laryngeal mask is composed of an airway tube that connects to an elliptical mask with a cuff which is inserted through the patient 39s mouth, down the windpipe, and once deployed forms an .Nasopharyngeal airway In medicine, a nasopharyngeal airway, also known as an NPA, nasal trumpet because of its flared end , or nose hose, is a type of airway adjunct, a tube that is designed to be inserted into the nasal passageway to secure an open airway.When a patient becomes unconscious, the muscles in the jaw commonly relax and can allow the tongue to slide back and obstruct the airway.Laryngeal tube The laryngeal tube also known as the King LT is an airway management device designed as an alternative to other airway management techniques such as mask ventilation, laryngeal mask airway, and tracheal intubation.This device can be inserted blindly through the oropharynx into the hypopharynx to create an airway during anaesthesia and cardiopulmonary resuscitation so as to enable mechanical .Oropharyngeal airway An oropharyngeal airway is a medical device called an airway adjunct used to maintain or open a patient 39s airway. It does this by preventing the tongue from covering the epiglottis, which could prevent the person from breathing. When a person becomes unconscious, the muscles in their jaw relax and allow the tongue to obstruct the airway.Gas cylinder A gas cylinder is a pressure vessel for storage and containment of gases at above atmospheric pressure.Highpressure gas cylinders are also called bottles.Inside the cylinder the stored contents may be in a state of compressed gas, vapor over liquid, supercritical fluid, or dissolved in a substrate material, depending on the physical characteristics of the contents.