Final answer:
Jet ventilation is the high-frequency ventilation method that delivers pulsations under pressure at rates of 1.7 to 10 Hz through a small lumen.
Step-by-step explanation:
The type of high-frequency ventilation that involves the delivery of pulsations under pressure through a small lumen at rates of 1.7 to 10 Hz is jet ventilation. This form of respiratory support is used primarily in particular medical situations where more conventional modes of ventilation are not suitable or inadequate. The pulsations created by jet ventilation are capable of providing adequate gas exchange at very high rates of frequency. This is markedly different from oscillatory ventilation, which also uses high frequencies but achieves gas exchange through the creation of oscillatory flow patterns.