Bi-level flow generator with manual standard leak adjustment
First Claim
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1. An apparatus for delivering a breathing gas to a patient comprisinga blower that generates a flow of a breathing gas;
- a gas flow rate sensor positioned to sense the flow of breathing gas generated by said blower;
a memory device containing a plurality of purge hole leak profiles corresponding to specific breathing appliances;
means for selecting one of said plurality of purge hole leak profiles from said memory device; and
a microprocessor programmed to calculate at least one of excess leak, tidal volume, and peak flow using a flow rate measured by said gas flow rate sensor and the selected purge hole leak profile.
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Abstract
An apparatus for delivering a breathing gas to a patient includes a display, a storage device programmed to hold different purge hole leak profiles for a variety of mask types, and a selection mechanism for selecting one of the profiles so that accurate values of tidal volume, excess leak and peak flow may be calculated and shown on the display. The displayed excess leak value can be used to correct the fit of the mask.
259 Citations
20 Claims
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1. An apparatus for delivering a breathing gas to a patient comprising
a blower that generates a flow of a breathing gas; -
a gas flow rate sensor positioned to sense the flow of breathing gas generated by said blower;
a memory device containing a plurality of purge hole leak profiles corresponding to specific breathing appliances;
means for selecting one of said plurality of purge hole leak profiles from said memory device; and
a microprocessor programmed to calculate at least one of excess leak, tidal volume, and peak flow using a flow rate measured by said gas flow rate sensor and the selected purge hole leak profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for delivering a breathing gas to a user comprising the steps of
generating a flow of a breathing gas using a gas flow generator; -
measuring the flow rate of the breathing gas;
selecting one of a plurality of purge hole leak profiles from a memory device, which memory device contains a plurality of purge hole leak profiles corresponding to a plurality of specific breathing appliances; and
calculating at least one of excess leak, tidal volume, and peak flow using the measured flow rate and the selected purge hole leak profile. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification