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US 4,765,340 AGranted
Apnea detector
AssigneeMinolta Camera Kabushiki Kaisha
InventorsTakao Sakai, Kenji Hamaguri
Life of this patent
Estimating the term…
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.
Claims8
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.
4 more elements
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 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.
5 more elements
Dependencies are inferred from the claim text.