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SUCTION UNITS

SUCTION UNITS. Purpose: A suction/pressure unit can provide controlled pressure, vacuum, or both. They can be portable or fixed Suction Units Uses High volume Saliva evacuators in dental Surgery and ER for drainage of wounds and massive bleeding

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SUCTION UNITS

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  1. SUCTION UNITS • Purpose: A suction/pressure unit can provide controlled pressure, vacuum, or both. They can be portable or fixed • Suction Units Uses • High volume • Saliva evacuators in dental • Surgery and ER for drainage of wounds and massive bleeding • On "crash carts" for quick aspiration during emergencies

  2. SUCTION UNITS • Low volume • ENT-for minor surgery, ear irrigation, etc • Wards-thermatic units for slow drainage • Various lab and dental equipment; cell counters, vacuum mixer investor, porcelain furnace • Pressure Units Uses • Automatic BP cuffs • Nebulizers and portable ventilators • Impedance audiometers and tympanographs • Automated lab equipment to operate valves, pistons, etc

  3. SUCTION UNITS • Types of Suction/Pressure Units • Piston • Operates on principle of moving piston inside a cylinder • Valves (either cam operated or reed) control direction of air flow • Vary greatly in size • Can achieve extremely high volume and pressures • Usually require maintenance of oil level-although some are "oil less"

  4. SUCTION UNITS • Oscillating pumps • A rapidly oscillating rubber diaphragm replaces the moving piston • Small versions (aquarium pump style) are found in some cell counters • Larger versions are seen in dental lab • Can obtain fairly good vacuum and pressure • Virtually maintenance free Does require periodic replacement of diaphragm

  5. SUCTION UNITS • Rotary vane • Uses an eccentric rotor within a cylinder • Movable vanes keep tight seal • Air intake provides vacuum • Exhaust side supplies pressure   • Can obtain very high vacuum • Very common throughout hospital (portable pressure/suction units) • Require periodic maintenance of oil level and cleaning of vanes

  6. SUCTION UNITS • Thermotic (Intermittent) • Uses principle of Charles's Law • Gas expands when heated • The gas contracts when cooled   • Valves control direction of air flow • Used for vacuum applications only • Vacuum produced is cyclic-intermittent • Extremely low vacuum and volume • No moving parts and maintenance free

  7. SUCTION UNITS • Measurement • Vacuum • mmHg (millimeters of Mercury) • inches of Hg (Hg = Mercury) • cm of Hg (cm = centimeters) • inches of water • cm of water

  8. SUCTION UNITS • Pressure • lb/sq in (pounds per square inch) • Kg/sq cm (kilograms per square centimeter) • mmHg • inches of Hg • Flow rate • cu ft/min • liters/min • liters/hr • Conversions - units of measurements within each category can be converted

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