Apnea detector
First Claim
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1. An apnea detector comprising:
- means for measuring oxygen saturation in blood to produce a measured oxygen saturation signal indicating the measured oxygen saturation;
means for storing a normal oxygen saturation of a normal condition to produce a normal oxygen saturation signal;
means for storing an increasing speed of oxygen saturation;
means for comparing the measured oxygen saturation signal with the normal oxygen saturation signal to produce a first detecting signal when the measured oxygen saturation is larger than the normal oxygen saturation stored;
means for calculating an increasing speed of oxygen saturation based on a plurality of the measured oxygen saturation signals to produce a second detecting signal when the calculated increasing speed of oxygen saturation is higher than the stored increasing speed of oxygen saturation; and
means for detecting recovery from apnea condition in accordance with the first and second detecting signals.
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Abstract
A medical apparatus for detecting apnea, in particular, in infants and children. The apparatus measures oxygen saturation in the blood and relates the measurement to a normal condition. The relationship is employed to indicate apnea.
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Citations
8 Claims
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1. An apnea detector comprising:
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means for measuring oxygen saturation in blood to produce a measured oxygen saturation signal indicating the measured oxygen saturation; means for storing a normal oxygen saturation of a normal condition to produce a normal oxygen saturation signal; means for storing an increasing speed of oxygen saturation; means for comparing the measured oxygen saturation signal with the normal oxygen saturation signal to produce a first detecting signal when the measured oxygen saturation is larger than the normal oxygen saturation stored; means for calculating an increasing speed of oxygen saturation based on a plurality of the measured oxygen saturation signals to produce a second detecting signal when the calculated increasing speed of oxygen saturation is higher than the stored increasing speed of oxygen saturation; and means for detecting recovery from apnea condition in accordance with the first and second detecting signals. - View Dependent Claims (2, 3, 4)
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5. An apnea detector comprising:
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means for measuring oxygen saturation in blood to produce a measured oxygen saturation signal indicating the measured oxygen saturation; means for storing a normal oxygen saturation of a normal condition to produce a normal oxygen saturation signal; means for storing an increasing speed of oxygen saturation; means for calculating increasing speed of oxygen saturation based on a plurality of the measured oxygen saturation signals to produce a first detecting signal when the calculated increasing speed of oxygen saturation is higher than the stored increasing speed of oxygen saturation; means for comparing the measured oxygen saturation signal with the normal oxygen saturation signal stored to produce a second detecting signal when the measured oxygen saturation is higher than the stored normal oxygen saturation; means for detecting start of recovery from an apnea condition in response to the first detecting signal; and means for detecting recovery from apnea condition in response to the second detecting signal. - View Dependent Claims (6, 7, 8)
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Specification