title: The digital control of anaesthetic gas flow.
abstract: The theory and construction of a prototype digital gas flow controller are described. Using eight preset needle valves, it has the ability to deliver any flow from 50 to 12750 ml/minute in steps of 50 ml/minute. Under given conditions, the accuracy of this device is very high and its variation in performance with pipeline supply pressures is quantified. The required flow is requested from a BBC 'B' microcomputer which is interfaced with the equipment via a program written in Basic and the 1MHz bus port. The possible uses and potential of a microcomputer-controlled flow regulator in anaesthesia and intensive care are discussed.
mesh_terms: D000769:Anesthesia, Inhalation / Q000295:instrumentation*; D003201:Computers; D004867:Equipment Design; D008838:Microcomputers; D012212:Rheology