The volume displacement device that creates a sinusoidal flow waveform is which of the follow-ing?
a. Rotary drive piston
b. Linear drive piston
c. Spring-loaded bellows
d. Proportional solenoid
ANS: A
The rotary drive piston creates a flow pattern that is slow at the beginning of inspiration, achieves highest speed at mid-inspiration, and tapers off at end-inspiration, creating a sinusoidal wave-form (sine waveform).
Health Professions
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