Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Reexamination Certificate
2003-11-10
2008-11-11
Douglas, Steven O (Department: 3771)
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
C128S204230, C381S071300
Reexamination Certificate
active
07448382
ABSTRACT:
A medical device, such as a respiratory treatment device, having an active acoustic noise cancellation system. In one embodiment, the noise minimizing system includes at least one detector detecting characteristics of acoustic noise of a blower assembly and at least one speaker creating a cancellation frequency in the form of acoustic waves that at least partially cancels acoustic waves generated by the blower assembly. In another embodiment, the noise minimizing system includes a mechanical vibration generating element that creates a cancellation frequency in the form of a mechanical vibration that at least partially cancels vibrations of the blower assembly. This is accomplished, for example, by dithering a flow control valve at a frequency corresponding to an operating frequency of the blower assembly. Each embodiment can be used alone or in combination.
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Alexander Paul
Habura Chirstopher
Truitt Patrick W
Truschel William A
Douglas Steven O
Haas Michael W.
RIC Investments LLC
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