Apparatus and method for inspiration detection
First Claim
1. An apparatus for detecting inspiration of a patient in response to a time varying signal representative of the patient'"'"'s respiration comprising:
- means for establishing a baseline level for said respiration signal which falls between the peak to peak variations of said respiration signal;
means for establishing a trigger level for said respiration signal representative of inspiration;
means for generating inspiration trigger signals in response to selected crossovers of said trigger level by said respiration signal;
means for automatically detecting shifts in the baseline level of said respiration signal; and
means responsive to said baseline shift detection means for re-establishing said baseline and trigger levels.
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Abstract
An apparatus and method for detecting patient inspiration is provided. It includes means for providing a baseline level for the patient'"'"'s respiration signal and for establishing a trigger level representative of inspiration. When the respiration signal crosses the trigger level for selected crossovers inspiration trigger signals are generated. Most importantly means are provided for automatically detecting shifts in the baseline level and for re-establishing the trigger level for the shifted waveform. In the preferred embodiment the apparatus is capable of detecting a baseline shift in about one cycle of the respiration waveform.
The apparatus and method further provides for an inspiration detector with adjustable detection characteristics to accommodate both adult and neonate patients.
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Citations
26 Claims
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1. An apparatus for detecting inspiration of a patient in response to a time varying signal representative of the patient'"'"'s respiration comprising:
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means for establishing a baseline level for said respiration signal which falls between the peak to peak variations of said respiration signal; means for establishing a trigger level for said respiration signal representative of inspiration; means for generating inspiration trigger signals in response to selected crossovers of said trigger level by said respiration signal; means for automatically detecting shifts in the baseline level of said respiration signal; and means responsive to said baseline shift detection means for re-establishing said baseline and trigger levels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for detecting inspiration of a patient in response to a time varying signal representative of the patient'"'"'s respiration comprising the steps of:
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establishing a baseline level for said respiration signal which falls between the peak to peak variations of said respiration signal; establishing a trigger level for said respiration signal representative of inspiration; generating inspiration trigger signals in response to selected crossovers of said trigger level by said respiration signal; automatically detecting shifts in the baseline level of said respiration signal; and re-establishing said baseline and trigger levels in response to detection of said baseline shift. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification