Patent ID: 11857457
Assignee: GOOD NEWS MEDICAL CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 27:
28. The device for alleviating obstructive sleep apnea according to claim 27, wherein the active noise-attenuating unit has a built-in noise model corresponding to the negative pressure pump, such that the active noise-attenuating unit generates a first noise-attenuated sound wave with a phase inverse to the built-in noise model when the negative pressure pump starts, wherein after a sound wave resulting from superposition of actual noise generated by the negative pressure pump and the first noise-attenuated sound wave has been received by the active noise-attenuating unit, the active noise-attenuating unit generates a second noise-attenuated sound wave with a phase inverse to the sound wave actually received.