The portable<unk> unit of an ambulance A dental vacuum system for central<unk> In medicine, devices are sometimes necessary to create<unk> <unk> may be used to clear the airway of blood, saliva, vomit, or other secretions so that a patient may breathe.<unk> ng can prevent pulmonary aspiration, which can lead to lung infections. In pulmonary hygiene,<unk> is used to remove fluids from the airways, to facilitate breathing and prevent growth of microorganisms. Small<unk> providing devices are often called aspirators. In surgery<unk> can be used to remove blood from the area being operated on to allow surgeons to view and work on the area.<unk> may also be used to remove blood that has built up within the skull after an intracranial hemorrhage.<unk> devices may be mechanical hand pumps or battery or electrically operated mechanisms. In many hospitals and other health facilities,<unk> is typically provided by<unk> regulators, connected to a central medical vacuum supply by way of a pipeline system. The plastic, rigid Yankauer<unk> tip is one type of tip that may be attached to a<unk> device. Another is the plastic, nonrigid French or whistle tip catheter.
Suction 
Freeze spray
Mouthwash
Tao brush
Depot injection
Dressing 
Throat lozenge
Surgical mask