What type of drive mechanism would produce the pressure, volume, and flow waveforms illustrated below?
A. spring-loaded bellows
B. proportional solenoid valve
C. piston attached to a rotating crank
D. electric motor/rack and pinion
?ANS: C?A. Incorrect response: Spring-loaded bellows, such as a linear-driven piston, produces a square (rectangular) flow waveform, a linear ascending ramp volume waveform, and an ascending ramp pressure waveform.
B. Incorrect response: A proportional solenoid valve is not a drive mechanism. It is a flow control valve. Flow control valves ensure the precise flow of gas to patients as the gas flows from high-pressure sources.
C. Correct response: A piston attached to a rotating crank is a drive mechanism that provides output waveforms that are sinusoidal for pressure, volume, and flow.
D. Incorrect response: A linear drive piston, as with an electric motor/rack and pinion drive mechanism, produces an output of a rectangular flow, ascending ramp volume, and a linear ascending ramp pressure waveform. These ventilators are only of historical interest.?
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