Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Reexamination Certificate
2007-01-09
2007-01-09
Lewis, Aaron J. (Department: 3743)
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
C128S205110, C128S207120, C128S207130
Reexamination Certificate
active
10976874
ABSTRACT:
The present invention provides a vent assembly suitable for use with a respiratory mask of the type used in CPAP treatment. In one embodiment the vent is made of a thin air permeable membrane. Generally, the membrane is thinner than 0.5 mm. The membrane can be made of a hydrophobic material such as polytetrafluoroethylene (PTFE). The membrane can also be fabricated from expanded PTFE. The expanded PTFE membrane is mounted on a polypropylene scrim. The pores of the membrane have a reference pore size of 10 to 15 microns. In an alternative embodiment, the vent assembly includes a vent constructed from stainless steel. In another embodiment the membrane has a superficial cross-sectional area of approximately 500 mm2. In another embodiment the vent assembly comprises a membrane attached to a vent frame, the vent assembly forming an insert which can be removably attached to a mask frame.
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Instruction Brochure for “E-vent-N” Aug. 1997, © Dräger Medizintechnik GmbH, 2 pages.
Crumblin Geoffrey
Drew Joanne
Virr Alexander
Lewis Aaron J.
ResMed Limited
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