Surgery – Respiratory method or device – Means for mixing treating agent with respiratory gas
Reexamination Certificate
2008-05-06
2008-05-06
Douglas, Steven O. (Department: 3771)
Surgery
Respiratory method or device
Means for mixing treating agent with respiratory gas
C392S390000, C392S397000
Reexamination Certificate
active
07367334
ABSTRACT:
A fluid vaporizing device useful for vaporizing fluid into an aerosol includes a capillary tube made from an electrically conductive material, an upstream electrode connected to the capillary tube, and a downstream electrode connected to the tube and provided with an electrical resistivity sufficient to cause heating of the downstream electrode during operation. According to various manufacturing techniques (a) the downstream electrode can be made of a material having a resistivity that is approximately constant over a desired temperature range, (b) the ratio of the resistance of the downstream electrode to the resistance of the capillary tube can be selected as a function of a preset liquid flow rate through the capillary tube, (c) the tuning range over which a desired quality aerosol can be produced can be selected to compensate for dimensional tolerances during mass production, and (d) the total hot resistance of the downstream electrode and capillary tube can be adjusted to control the location of a meniscus of a liquid vaporized in the capillary tube to produce a desired quality aerosol.
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Faison, Jr. Gene G.
Gupta Rajiv
McRae Douglas D.
Nichols Walter A.
Buchanan & Ingersoll & Rooney PC
Douglas Steven O.
Philip Morris USA Inc.
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