Tracheal StenosisTracheostomy: Surgical formation of an opening into the trachea through the neck, or the opening so created.Laryngostenosis: Developmental or acquired stricture or narrowing of the LARYNX. Symptoms of respiratory difficulty depend on the degree of laryngeal narrowing.Bronchoscopy: Endoscopic examination, therapy or surgery of the bronchi.Intubation, Intratracheal: A procedure involving placement of a tube into the trachea through the mouth or nose in order to provide a patient with oxygen and anesthesia.Tracheal NeoplasmsBurns, Inhalation: Burns of the respiratory tract caused by heat or inhaled chemicals.Trachea: The cartilaginous and membranous tube descending from the larynx and branching into the right and left main bronchi.Tracheotomy: Surgical incision of the trachea.Airway Obstruction: Any hindrance to the passage of air into and out of the lungs.Respiratory System Abnormalities: Congenital structural abnormalities of the respiratory system.Papio cynocephalus: A species of baboon in the family CERCOPITHECIDAE found in southern equatorial and east Africa. They are smaller than PAPIO ANUBIS and have a thinner mane.Tracheoesophageal Fistula: Abnormal passage between the ESOPHAGUS and the TRACHEA, acquired or congenital, often associated with ESOPHAGEAL ATRESIA.Silicones: A broad family of synthetic organosiloxane polymers containing a repeating silicon-oxygen backbone with organic side groups attached via carbon-silicon bonds. Depending on their structure, they are classified as liquids, gels, and elastomers. (From Merck Index, 12th ed)Dilatation: The act of dilating.Pulmonary Surgical Procedures: Surgery performed on the lung.Carotid Stenosis: Narrowing or stricture of any part of the CAROTID ARTERIES, most often due to atherosclerotic plaque formation. Ulcerations may form in atherosclerotic plaques and induce THROMBUS formation. Platelet or cholesterol emboli may arise from stenotic carotid lesions and induce a TRANSIENT ISCHEMIC ATTACK; CEREBROVASCULAR ACCIDENT; or temporary blindness (AMAUROSIS FUGAX). (From Adams et al., Principles of Neurology, 6th ed, pp 822-3)Aortic Valve Stenosis: A pathological constriction that can occur above (supravalvular stenosis), below (subvalvular stenosis), or at the AORTIC VALVE. It is characterized by restricted outflow from the LEFT VENTRICLE into the AORTA.Tracheal DiseasesStents: Devices that provide support for tubular structures that are being anastomosed or for body cavities during skin grafting.Coronary Stenosis: Narrowing or constriction of a coronary artery.Spinal Stenosis: Narrowing of the spinal canal.Laser Therapy: The use of photothermal effects of LASERS to coagulate, incise, vaporize, resect, dissect, or resurface tissue.